vms/ui/project/services/training.py

import os
import sys
import json
import time
import shutil
import gradio as gr
from pathlib import Path
from datetime import datetime
import subprocess
import signal
import psutil
import tempfile
import zipfile
import logging
import traceback
import threading
import fcntl
import select

from typing import Any, Optional, Dict, List, Union, Tuple

from huggingface_hub import upload_folder, create_repo

from vms.config import (
    TrainingConfig, RESOLUTION_OPTIONS, SD_TRAINING_BUCKETS, MD_TRAINING_BUCKETS,
    STORAGE_PATH, HF_API_TOKEN, 
    MODEL_TYPES, TRAINING_TYPES, MODEL_VERSIONS,
    DEFAULT_NB_TRAINING_STEPS, DEFAULT_SAVE_CHECKPOINT_EVERY_N_STEPS,
    DEFAULT_BATCH_SIZE, DEFAULT_CAPTION_DROPOUT_P,
    DEFAULT_LEARNING_RATE,
    DEFAULT_LORA_RANK, DEFAULT_LORA_ALPHA,
    DEFAULT_LORA_RANK_STR, DEFAULT_LORA_ALPHA_STR,
    DEFAULT_SEED, DEFAULT_RESHAPE_MODE,
    DEFAULT_REMOVE_COMMON_LLM_CAPTION_PREFIXES,
    DEFAULT_DATASET_TYPE, DEFAULT_PROMPT_PREFIX,
    DEFAULT_MIXED_PRECISION, DEFAULT_TRAINING_TYPE,
    DEFAULT_NUM_GPUS,
    DEFAULT_MAX_GPUS,
    DEFAULT_PRECOMPUTATION_ITEMS,
    DEFAULT_NB_TRAINING_STEPS,
    DEFAULT_NB_LR_WARMUP_STEPS,
    DEFAULT_AUTO_RESUME,
    DEFAULT_CONTROL_TYPE, DEFAULT_TRAIN_QK_NORM,
    DEFAULT_FRAME_CONDITIONING_TYPE, DEFAULT_FRAME_CONDITIONING_INDEX,
    DEFAULT_FRAME_CONDITIONING_CONCATENATE_MASK,
    generate_model_project_id
)
from vms.utils import (
    get_available_gpu_count,
    make_archive,
    parse_training_log,
    is_image_file,
    is_video_file,
    prepare_finetrainers_dataset,
    copy_files_to_training_dir
)

logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)

class TrainingService:
    def __init__(self, app=None):
        """Initialize the training service
        
        Args:
            app: Reference to main application
        """
        self.app = app

        self.file_lock = threading.Lock()
        self.file_handler = None
        self.setup_logging()
        self.ensure_valid_ui_state_file()
        

        # Start background cleanup task
        self._cleanup_stop_event = threading.Event()
        self._cleanup_thread = threading.Thread(target=self._background_cleanup_task, daemon=True)
        self._cleanup_thread.start()

        logger.info("Training service initialized")

    def setup_logging(self):
        """Set up logging with proper handler management"""
        global logger
        logger = logging.getLogger(__name__)
        logger.setLevel(logging.INFO)
        
        # Remove any existing handlers to avoid duplicates
        logger.handlers.clear()
        
        # Add stdout handler
        stdout_handler = logging.StreamHandler(sys.stdout)
        stdout_handler.setFormatter(logging.Formatter(
            '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
        ))
        logger.addHandler(stdout_handler)
        
        # Add file handler if log file is accessible
        try:
            # Close existing file handler if it exists
            if self.file_handler:
                self.file_handler.close()
                logger.removeHandler(self.file_handler)
            
            self.file_handler = logging.FileHandler(str(self.app.log_file_path))
            self.file_handler.setFormatter(logging.Formatter(
                '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
            ))
            logger.addHandler(self.file_handler)
        except Exception as e:
            logger.warning(f"Could not set up log file: {e}")

    def clear_logs(self) -> None:
        """Clear log file with proper handler cleanup"""
        try:
            # Remove and close the file handler
            if self.file_handler:
                logger.removeHandler(self.file_handler)
                self.file_handler.close()
                self.file_handler = None
            
            # Delete the file if it exists
            if self.app.log_file_path.exists():
                self.app.log_file_path.unlink()
            
            # Recreate logging setup
            self.setup_logging()
            self.append_log("Log file cleared and recreated")
            
        except Exception as e:
            logger.error(f"Error clearing logs: {e}")
            raise
    
    def __del__(self):
        """Cleanup when the service is destroyed"""
        if self.file_handler:
            self.file_handler.close()
    
    def update_project_state(self, state_updates: Dict[str, Any]) -> None:
        """Update project state in UI state file
        
        Args:
            state_updates: Dict of state values to update
        """
        current_state = self.load_ui_state()
        current_state.update(state_updates)
        self.save_ui_state(current_state)

        logger.info(f"Updated project state: {state_updates}")
        
    def save_ui_state(self, values: Dict[str, Any]) -> None:
        """Save current UI state to file with validation"""

        # Use a lock to prevent concurrent writes
        with self.file_lock:
            # Validate values before saving
            validated_values = {}
            default_state = self.get_default_ui_state()
            
            # Copy default values first
            validated_values = default_state.copy()
            
            # Update with provided values, converting types as needed
            for key, value in values.items():
                if key in default_state:
                    if key == "train_steps":
                        try:
                            validated_values[key] = int(value)
                        except (ValueError, TypeError):
                            validated_values[key] = default_state[key]
                    elif key == "batch_size":
                        try:
                            validated_values[key] = int(value)
                        except (ValueError, TypeError):
                            validated_values[key] = default_state[key]
                    elif key == "learning_rate":
                        try:
                            validated_values[key] = float(value)
                        except (ValueError, TypeError):
                            validated_values[key] = default_state[key]
                    elif key == "save_iterations":
                        try:
                            validated_values[key] = int(value)
                        except (ValueError, TypeError):
                            validated_values[key] = default_state[key]
                    elif key == "lora_rank" and value not in ["16", "32", "64", "128", "256", "512", "1024"]:
                        validated_values[key] = default_state[key]
                    elif key == "lora_alpha" and value not in ["16", "32", "64", "128", "256", "512", "1024"]:
                        validated_values[key] = default_state[key]
                    else:
                        validated_values[key] = value
            
            try:
                # First verify we can serialize to JSON
                json_data = json.dumps(validated_values, indent=2)
                
                # Write to the file
                with open(self.app.output_ui_state_file, 'w') as f:
                    f.write(json_data)
                logger.debug(f"UI state saved successfully")
            except Exception as e:
                logger.error(f"Error saving UI state: {str(e)}")
        
    def _backup_and_recreate_ui_state(self, default_state):
        """Backup the corrupted UI state file and create a new one with defaults"""
        try:
            # Create a backup with timestamp
            timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
            backup_file = self.app.output_ui_state_file.with_suffix(f'.json.bak_{timestamp}')
            
            # Copy the corrupted file
            shutil.copy2(self.app.output_ui_state_file, backup_file)
            logger.info(f"Backed up corrupted UI state file to {backup_file}")
        except Exception as backup_error:
            logger.error(f"Failed to backup corrupted UI state file: {str(backup_error)}")
        
        # Create a new file with default values
        self.save_ui_state(default_state)
        logger.info("Created new UI state file with default values after error")
        
    def get_default_ui_state(self) -> Dict[str, Any]:
        """Get a default UI state with robust error handling"""

        default_state = {
            "model_project_id": self.app.current_model_project_id if self.app.current_model_project_id else generate_model_project_id(),
            "project_status": self.app.current_model_project_status if self.app.current_model_project_status else "draft",
            "model_type": list(MODEL_TYPES.keys())[0],
            "model_version": "",
            "training_type": list(TRAINING_TYPES.keys())[0],
            "lora_rank": DEFAULT_LORA_RANK_STR,
            "lora_alpha": DEFAULT_LORA_ALPHA_STR, 
            "train_steps": DEFAULT_NB_TRAINING_STEPS,
            "batch_size": DEFAULT_BATCH_SIZE,
            "learning_rate": DEFAULT_LEARNING_RATE,
            "save_iterations": DEFAULT_SAVE_CHECKPOINT_EVERY_N_STEPS,
            "resolution": list(RESOLUTION_OPTIONS.keys())[0],
            "num_gpus": DEFAULT_NUM_GPUS,
            "precomputation_items": DEFAULT_PRECOMPUTATION_ITEMS,
            "lr_warmup_steps": DEFAULT_NB_LR_WARMUP_STEPS,
            "auto_resume": DEFAULT_AUTO_RESUME,
            # Control parameters
            "control_type": DEFAULT_CONTROL_TYPE,
            "train_qk_norm": DEFAULT_TRAIN_QK_NORM,
            "frame_conditioning_type": DEFAULT_FRAME_CONDITIONING_TYPE,
            "frame_conditioning_index": DEFAULT_FRAME_CONDITIONING_INDEX,
            "frame_conditioning_concatenate_mask": DEFAULT_FRAME_CONDITIONING_CONCATENATE_MASK
        }

        return default_state

    def load_ui_state(self) -> Dict[str, Any]:
        """Load saved UI state with robust error handling"""

        default_state = self.get_default_ui_state()
        
        # Use lock for reading too to avoid reading during a write
        with self.file_lock:

            if not self.app.output_ui_state_file.exists():
                logger.info("UI state file does not exist, using default values")
                return default_state
                    
            try:
                # First check if the file is empty
                file_size = self.app.output_ui_state_file.stat().st_size
                if file_size == 0:
                    logger.warning("UI state file exists but is empty, using default values")
                    return default_state
                    
                with open(self.app.output_ui_state_file, 'r') as f:
                    file_content = f.read().strip()
                    if not file_content:
                        logger.warning("UI state file is empty or contains only whitespace, using default values")
                        return default_state
                        
                    try:
                        saved_state = json.loads(file_content)
                    except json.JSONDecodeError as e:
                        logger.error(f"Error parsing UI state JSON: {str(e)}")
                        # Instead of showing the error, recreate the file with defaults
                        self._backup_and_recreate_ui_state(default_state)
                        return default_state
                    
                    # Clean up model type if it contains " (LoRA)" suffix
                    if "model_type" in saved_state and " (LoRA)" in saved_state["model_type"]:
                        saved_state["model_type"] = saved_state["model_type"].replace(" (LoRA)", "")
                        logger.info(f"Removed (LoRA) suffix from saved model type: {saved_state['model_type']}")

                    # Convert numeric values to appropriate types
                    if "train_steps" in saved_state:
                        try:
                            saved_state["train_steps"] = int(saved_state["train_steps"])
                        except (ValueError, TypeError):
                            saved_state["train_steps"] = default_state["train_steps"]
                            logger.warning("Invalid train_steps value, using default")
                            
                    if "batch_size" in saved_state:
                        try:
                            saved_state["batch_size"] = int(saved_state["batch_size"])
                        except (ValueError, TypeError):
                            saved_state["batch_size"] = default_state["batch_size"]
                            logger.warning("Invalid batch_size value, using default")
                            
                    if "learning_rate" in saved_state:
                        try:
                            saved_state["learning_rate"] = float(saved_state["learning_rate"])
                        except (ValueError, TypeError):
                            saved_state["learning_rate"] = default_state["learning_rate"]
                            logger.warning("Invalid learning_rate value, using default")
                            
                    if "save_iterations" in saved_state:
                        try:
                            saved_state["save_iterations"] = int(saved_state["save_iterations"])
                        except (ValueError, TypeError):
                            saved_state["save_iterations"] = default_state["save_iterations"]
                            logger.warning("Invalid save_iterations value, using default")
                        
                    # Make sure we have all keys (in case structure changed)
                    merged_state = default_state.copy()
                    merged_state.update({k: v for k, v in saved_state.items() if v is not None})
                    
                    # Validate model_type is in available choices
                    if merged_state["model_type"] not in MODEL_TYPES:
                        # Try to map from internal name
                        model_found = False
                        for display_name, internal_name in MODEL_TYPES.items():
                            if internal_name == merged_state["model_type"]:
                                merged_state["model_type"] = display_name
                                model_found = True
                                break
                        # If still not found, use default
                        if not model_found:
                            merged_state["model_type"] = default_state["model_type"]
                            logger.warning(f"Invalid model type in saved state, using default")
                                
                    # Validate model_version is appropriate for model_type
                    if "model_type" in merged_state and "model_version" in merged_state:
                        model_internal_type = MODEL_TYPES.get(merged_state["model_type"])
                        if model_internal_type:
                            valid_versions = MODEL_VERSIONS.get(model_internal_type, {}).keys()
                            if merged_state["model_version"] not in valid_versions:
                                # Set to default for this model type
                                from vms.ui.project.tabs.train_tab import TrainTab
                                train_tab = TrainTab(None)  # Temporary instance just for the helper method
                                merged_state["model_version"] = train_tab.get_default_model_version(saved_state["model_type"])
                                logger.warning(f"Invalid model version for {merged_state['model_type']}, using default")
                    
                    # Validate training_type is in available choices
                    if merged_state["training_type"] not in TRAINING_TYPES:
                        # Try to map from internal name
                        training_found = False
                        for display_name, internal_name in TRAINING_TYPES.items():
                            if internal_name == merged_state["training_type"]:
                                merged_state["training_type"] = display_name
                                training_found = True
                                break
                        # If still not found, use default
                        if not training_found:
                            merged_state["training_type"] = default_state["training_type"]
                            logger.warning(f"Invalid training type in saved state, using default")
                    
                    # Validate resolution is in available choices
                    if "resolution" in merged_state and merged_state["resolution"] not in RESOLUTION_OPTIONS:
                        merged_state["resolution"] = default_state["resolution"]
                        logger.warning(f"Invalid resolution in saved state, using default")
                        
                    # Validate lora_rank is in allowed values
                    if merged_state.get("lora_rank") not in ["16", "32", "64", "128", "256", "512", "1024"]:
                        merged_state["lora_rank"] = default_state["lora_rank"]
                        logger.warning(f"Invalid lora_rank in saved state, using default")
                        
                    # Validate lora_alpha is in allowed values
                    if merged_state.get("lora_alpha") not in ["16", "32", "64", "128", "256", "512", "1024"]:
                        merged_state["lora_alpha"] = default_state["lora_alpha"]
                        logger.warning(f"Invalid lora_alpha in saved state, using default")
                        
                    return merged_state
            except Exception as e:
                logger.error(f"Error loading UI state: {str(e)}")
                # If anything goes wrong, backup and recreate
                self._backup_and_recreate_ui_state(default_state)
                return default_state


    def ensure_valid_ui_state_file(self):
        """Ensure UI state file exists and is valid JSON"""

        default_state = self.get_default_ui_state()
        
        # If file doesn't exist, create it with default values
        if not self.app.output_ui_state_file.exists():
            logger.info("Creating new UI state file with default values")
            self.save_ui_state(default_state)
            return
        
        # Check if file is valid JSON
        try:
            # First check if the file is empty
            file_size = self.app.output_ui_state_file.stat().st_size
            if file_size == 0:
                logger.warning("UI state file exists but is empty, recreating with default values")
                self.save_ui_state(default_state)
                return
                
            with open(self.app.output_ui_state_file, 'r') as f:
                file_content = f.read().strip()
                if not file_content:
                    logger.warning("UI state file is empty or contains only whitespace, recreating with default values")
                    self.save_ui_state(default_state)
                    return
                    
                # Try to parse the JSON content
                try:
                    saved_state = json.loads(file_content)
                    logger.debug("UI state file validation successful")
                except json.JSONDecodeError as e:
                    # JSON parsing failed, backup and recreate
                    logger.error(f"Error parsing UI state JSON: {str(e)}")
                    self._backup_and_recreate_ui_state(default_state)
                    return
        except Exception as e:
            # Any other error (file access, etc)
            logger.error(f"Error checking UI state file: {str(e)}")
            self._backup_and_recreate_ui_state(default_state)
            return
                
    # Modify save_session to also store the UI state at training start
    def save_session(self, params: Dict) -> None:
        """Save training session parameters"""
        session_data = {
            "timestamp": datetime.now().isoformat(),
            "params": params,
            "status": self.get_status(),
            # Add UI state at the time training started
            "initial_ui_state": self.load_ui_state()
        }
        with open(self.app.output_session_file, 'w') as f:
            json.dump(session_data, f, indent=2)
    
    def load_session(self) -> Optional[Dict]:
        """Load saved training session"""
        if self.app.output_session_file.exists():
            try:
                with open(self.app.output_session_file, 'r') as f:
                    return json.load(f)
            except json.JSONDecodeError:
                return None
        return None

    def get_status(self) -> Dict:
        """Get current training status"""
        default_status = {'status': 'stopped', 'message': 'No training in progress'}
        
        if not self.app.output_status_file.exists():
            return default_status
                
        try:
            with open(self.app.output_status_file, 'r') as f:
                status = json.load(f)
                    
            # Check if process is actually running
            if self.app.output_pid_file.exists():
                with open(self.app.output_pid_file, 'r') as f:
                    pid = int(f.read().strip())
                if not psutil.pid_exists(pid):
                    # Process died unexpectedly
                    if status['status'] == 'training':
                        # Only log this once by checking if we've already updated the status
                        if not hasattr(self, '_process_terminated_logged') or not self._process_terminated_logged:
                            self.append_log("Training process terminated unexpectedly")
                            self._process_terminated_logged = True
                        status['status'] = 'error'
                        status['message'] = 'Training process terminated unexpectedly'
                        # Update the status file to avoid repeated logging
                        with open(self.app.output_status_file, 'w') as f:
                            json.dump(status, f, indent=2)
                    else:
                        status['status'] = 'stopped'
                        status['message'] = 'Training process not found'
            return status
                
        except (json.JSONDecodeError, ValueError):
            return default_status

    def get_logs(self, max_lines: int = 100) -> str:
        """Get training logs with line limit"""
        if self.app.output_log_file.exists():
            with open(self.app.output_log_file, 'r') as f:
                lines = f.readlines()
                return ''.join(lines[-max_lines:])
        return ""

    def append_log(self, message: str) -> None:
        """Append message to log file and logger"""
        timestamp = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
        with open(self.app.output_log_file, 'a') as f:
            f.write(f"[{timestamp}] {message}\n")
        logger.info(message)

    def clear_logs(self) -> None:
        """Clear log file"""
        if self.app.output_log_file.exists():
            self.app.output_log_file.unlink()
        self.append_log("Log file cleared")

    def validate_training_config(self, config: TrainingConfig, model_type: str) -> Optional[str]:
        """Validate training configuration"""
        logger.info(f"Validating config for {model_type}")
        
        try:
            # Basic validation
            if not config.output_dir:
                return "Output directory not specified"
                
            # For the dataset_config validation, we now expect it to be a JSON file
            dataset_config_path = Path(config.data_root)
            if not dataset_config_path.exists():
                return f"Dataset config file does not exist: {dataset_config_path}"
            
            # Check the JSON file is valid
            try:
                with open(dataset_config_path, 'r') as f:
                    dataset_json = json.load(f)
                
                # Basic validation of the JSON structure
                if "datasets" not in dataset_json or not isinstance(dataset_json["datasets"], list) or len(dataset_json["datasets"]) == 0:
                    return "Invalid dataset config JSON: missing or empty 'datasets' array"
                    
            except json.JSONDecodeError:
                return f"Invalid JSON in dataset config file: {dataset_config_path}"
            except Exception as e:
                return f"Error reading dataset config file: {str(e)}"
                    
            # Check training videos directory exists
            if not self.app.training_videos_path.exists():
                return f"Training videos directory does not exist: {self.app.training_videos_path}"
                
            # Validate file counts
            video_count = len(list(self.app.training_videos_path.glob('*.mp4')))
            
            if video_count == 0:
                return "No training files found"
                    
            # Model-specific validation
            if model_type == "hunyuan_video":
                if config.batch_size > 2:
                    return "Hunyuan model recommended batch size is 1-2"
                if not config.gradient_checkpointing:
                    return "Gradient checkpointing is required for Hunyuan model"
            elif model_type == "ltx_video":
                if config.batch_size > 4:
                    return "LTX model recommended batch size is 1-4"
            elif model_type == "wan":
                if config.batch_size > 4:
                    return "Wan model recommended batch size is 1-4"
                    
            logger.info(f"Config validation passed with {video_count} training files")
            return None
            
        except Exception as e:
            logger.error(f"Error during config validation: {str(e)}")
            return f"Configuration validation failed: {str(e)}"
        
    def start_training(
        self,
        model_type: str,
        lora_rank: str,
        lora_alpha: str,
        train_steps: int,
        batch_size: int, 
        learning_rate: float,
        save_iterations: int,
        repo_id: str,
        training_type: str = DEFAULT_TRAINING_TYPE,
        model_version: str = "",
        resume_from_checkpoint: Optional[str] = None,
        num_gpus: int = DEFAULT_NUM_GPUS,
        precomputation_items: int = DEFAULT_PRECOMPUTATION_ITEMS,
        lr_warmup_steps: int = DEFAULT_NB_LR_WARMUP_STEPS,
        progress: Optional[gr.Progress] = None,
        custom_prompt_prefix: Optional[str] = None,
    ) -> Tuple[str, str]:
        """Start training with finetrainers"""
        
        self.clear_logs()

        if not model_type:
            raise ValueError("model_type cannot be empty")
        if model_type not in MODEL_TYPES.values():
            raise ValueError(f"Invalid model_type: {model_type}. Must be one of {list(MODEL_TYPES.values())}")
        if training_type not in TRAINING_TYPES.values():
            raise ValueError(f"Invalid training_type: {training_type}. Must be one of {list(TRAINING_TYPES.values())}")

        # Check if we're resuming or starting new
        is_resuming = resume_from_checkpoint is not None
        log_prefix = "Resuming" if is_resuming else "Initializing"
        logger.info(f"{log_prefix} training with model_type={model_type}, training_type={training_type}")
        
        # Update progress if available
        #if progress:
        #    progress(0.15, desc="Setting up training configuration")
        
        try:
            current_dir = Path(__file__).parent.parent.parent.absolute()  # Go up to project root
            train_script = current_dir / "train.py"
            
            if not train_script.exists():
                # Try alternative locations
                alt_locations = [
                    current_dir.parent / "train.py",  # One level up from project root
                    Path("/home/user/app/train.py"),  # Absolute path
                    Path("train.py")  # Current working directory
                ]
                
                for alt_path in alt_locations:
                    if alt_path.exists():
                        train_script = alt_path
                        logger.info(f"Found train.py at alternative location: {train_script}")
                        break
                
                if not train_script.exists():
                    error_msg = f"Training script not found at {train_script} or any alternative locations"
                    logger.error(error_msg)
                    return error_msg, "Training script not found"
                    
            # Log paths for debugging
            logger.info("Current working directory: %s", current_dir)
            logger.info("Training script path: %s", train_script)
            logger.info("Training data path: %s", self.app.training_path)
                
            # Update progress
            #if progress:
            #    progress(0.2, desc="Preparing training dataset")
            
            videos_file, prompts_file = prepare_finetrainers_dataset()
            if videos_file is None or prompts_file is None:
                error_msg = "Failed to generate training lists"
                logger.error(error_msg)
                return error_msg, "Training preparation failed"

            video_count = sum(1 for _ in open(videos_file))
            logger.info(f"Generated training lists with {video_count} files")

            if video_count == 0:
                error_msg = "No training files found"
                logger.error(error_msg)
                return error_msg, "No training data available"

            # Update progress
            #if progress:
            #    progress(0.25, desc="Creating dataset configuration")
                
            # Get resolution configuration from UI state
            ui_state = self.load_ui_state()
            resolution_option = ui_state.get("resolution", list(RESOLUTION_OPTIONS.keys())[0])
            training_buckets_name = RESOLUTION_OPTIONS.get(resolution_option, "SD_TRAINING_BUCKETS")
            
            # Determine which buckets to use based on the selected resolution
            if training_buckets_name == "SD_TRAINING_BUCKETS":
                training_buckets = SD_TRAINING_BUCKETS
            elif training_buckets_name == "MD_TRAINING_BUCKETS":
                training_buckets = MD_TRAINING_BUCKETS
            else:
                training_buckets = SD_TRAINING_BUCKETS  # Default fallback
            
            # Determine flow weighting scheme based on model type
            if model_type == "hunyuan_video":
                flow_weighting_scheme = "none"
            else:
                flow_weighting_scheme = "logit_normal"

            # Use the custom prompt prefix passed as parameter
            # Clean the prefix - remove trailing comma, space or comma+space
            if custom_prompt_prefix:
                custom_prompt_prefix = custom_prompt_prefix.rstrip(', ')

            # Create a proper dataset configuration JSON file
            dataset_config_file = self.app.output_path / "dataset_config.json"

            # Determine appropriate ID token based on model type and custom prefix
            id_token = custom_prompt_prefix  # Use custom prefix as the primary id_token

            # Only use default ID tokens if no custom prefix is provided
            if not id_token:
                id_token = DEFAULT_PROMPT_PREFIX

            dataset_config = {
                "datasets": [
                    {
                        "data_root": str(self.app.training_path),
                        "dataset_type": DEFAULT_DATASET_TYPE,
                        "id_token": id_token,
                        "video_resolution_buckets": [[f, h, w] for f, h, w in training_buckets],
                        "reshape_mode": DEFAULT_RESHAPE_MODE,
                        "remove_common_llm_caption_prefixes": DEFAULT_REMOVE_COMMON_LLM_CAPTION_PREFIXES,
                    }
                ]
            }

            # Write the dataset config to file
            with open(dataset_config_file, 'w') as f:
                json.dump(dataset_config, f, indent=2)

            logger.info(f"Created dataset configuration file at {dataset_config_file}")

            # Get config for selected model type with preset buckets
            if model_type == "hunyuan_video":
                if training_type == "lora":
                    config = TrainingConfig.hunyuan_video_lora(
                        data_path=str(self.app.training_path),
                        output_path=str(self.app.output_path),
                        buckets=training_buckets
                    )
                else:
                    # Hunyuan doesn't support full finetune in our UI yet
                    error_msg = "Full finetune is not supported for Hunyuan Video due to memory limitations"
                    logger.error(error_msg)
                    return error_msg, "Training configuration error"
            elif model_type == "ltx_video":
                if training_type == "lora":
                    config = TrainingConfig.ltx_video_lora(
                        data_path=str(self.app.training_path),
                        output_path=str(self.app.output_path),
                        buckets=training_buckets
                    )
                else:
                    config = TrainingConfig.ltx_video_full_finetune(
                        data_path=str(self.app.training_path),
                        output_path=str(self.app.output_path),
                        buckets=training_buckets
                    )
            elif model_type == "wan":
                if training_type == "lora":
                    config = TrainingConfig.wan_lora(
                        data_path=str(self.app.training_path),
                        output_path=str(self.app.output_path),
                        buckets=training_buckets
                    )
                else:
                    error_msg = "Full finetune for Wan is not yet supported in this UI"
                    logger.error(error_msg)
                    return error_msg, "Training configuration error"
            else:
                error_msg = f"Unsupported model type: {model_type}"
                logger.error(error_msg)
                return error_msg, "Unsupported model"
            
            # Create validation dataset if needed
            validation_file = None
            #if enable_validation:  # Add a parameter to control this
            #    validation_file = create_validation_config(self.app.training_videos_path, self.app.output_path)
            #    if validation_file:
            #        config_args.extend([
            #            "--validation_dataset_file", str(validation_file),
            #            "--validation_steps", "500"  # Set this to a suitable value
            #        ])
                    
            # Update with UI parameters
            config.train_steps = int(train_steps)
            config.batch_size = int(batch_size)
            config.lr = float(learning_rate)
            config.checkpointing_steps = int(save_iterations)
            config.training_type = training_type
            config.flow_weighting_scheme = flow_weighting_scheme
            
            config.lr_warmup_steps = int(lr_warmup_steps)
    
            # Update the NUM_GPUS variable and CUDA_VISIBLE_DEVICES
            num_gpus = min(num_gpus, get_available_gpu_count())
            if num_gpus <= 0:
                num_gpus = 1
            
            # Generate CUDA_VISIBLE_DEVICES string
            visible_devices = ",".join([str(i) for i in range(num_gpus)])
            
            config.data_root = str(dataset_config_file)
            
            # Update LoRA parameters if using LoRA training type
            if training_type == "lora" or training_type == "control-lora":
                config.lora_rank = int(lora_rank)
                config.lora_alpha = int(lora_alpha)
                
            # Update Control parameters if using control training types
            if training_type in ["control-lora", "control-full-finetune"]:
                # Get control parameters from UI state
                current_state = self.load_ui_state()
                
                # Add control-specific parameters
                control_type = current_state.get("control_type", DEFAULT_CONTROL_TYPE)
                train_qk_norm = current_state.get("train_qk_norm", DEFAULT_TRAIN_QK_NORM)
                frame_conditioning_type = current_state.get("frame_conditioning_type", DEFAULT_FRAME_CONDITIONING_TYPE)
                frame_conditioning_index = current_state.get("frame_conditioning_index", DEFAULT_FRAME_CONDITIONING_INDEX)
                frame_conditioning_concatenate_mask = current_state.get("frame_conditioning_concatenate_mask", DEFAULT_FRAME_CONDITIONING_CONCATENATE_MASK)
                
                # Map boolean from UI state to command line args
                config_args.extend([
                    "--control_type", control_type,
                ])
                
                if train_qk_norm:
                    config_args.append("--train_qk_norm")
                    
                config_args.extend([
                    "--frame_conditioning_type", frame_conditioning_type,
                    "--frame_conditioning_index", str(frame_conditioning_index)
                ])
                
                if frame_conditioning_concatenate_mask:
                    config_args.append("--frame_conditioning_concatenate_mask")

            # Update with resume_from_checkpoint if provided
            if resume_from_checkpoint:
                # Validate checkpoints and find a valid one to resume from
                valid_checkpoint = self.validate_and_find_valid_checkpoint()
                if valid_checkpoint:
                    config.resume_from_checkpoint = "latest"
                    checkpoint_step = int(Path(valid_checkpoint).name.split("_")[-1])
                    self.append_log(f"Resuming from validated checkpoint at step {checkpoint_step}")
                    logger.info(f"Resuming from validated checkpoint: {valid_checkpoint}")
                else:
                    error_msg = "No valid checkpoints found to resume from"
                    logger.error(error_msg)
                    self.append_log(error_msg)
                    return error_msg, "No valid checkpoints available"
            
            # Common settings for both models
            config.mixed_precision = DEFAULT_MIXED_PRECISION
            config.seed = DEFAULT_SEED
            config.gradient_checkpointing = True
            config.enable_slicing = True
            config.enable_tiling = True
            config.caption_dropout_p = DEFAULT_CAPTION_DROPOUT_P

            config.precomputation_items = precomputation_items
            
            validation_error = self.validate_training_config(config, model_type)
            if validation_error:
                error_msg = f"Configuration validation failed: {validation_error}"
                logger.error(error_msg)
                return "Error: Invalid configuration", error_msg

            # Convert config to command line arguments for all launcher types
            config_args = config.to_args_list()
            logger.debug("Generated args list: %s", config_args)
            
            # Use different launch commands based on model type
            # For Wan models, use torchrun instead of accelerate launch
            if model_type == "wan":
                # Configure torchrun parameters
                torchrun_args = [
                    "torchrun",
                    "--standalone",
                    "--nproc_per_node=" + str(num_gpus),
                    "--nnodes=1",
                    "--rdzv_backend=c10d",
                    "--rdzv_endpoint=localhost:0",
                    str(train_script)
                ]
                
                # Additional args needed for torchrun
                config_args.extend([
                    "--parallel_backend", "ptd",
                    "--pp_degree", "1", 
                    "--dp_degree", "1", 
                    "--dp_shards", "1", 
                    "--cp_degree", "1", 
                    "--tp_degree", "1"
                ])
                
                # Log the full command for debugging
                command_str = ' '.join(torchrun_args + config_args)
                self.append_log(f"Command: {command_str}")
                logger.info(f"Executing command: {command_str}")
                
                launch_args = torchrun_args
            else:
                # For other models, use accelerate launch as before
                # Determine the appropriate accelerate config file based on num_gpus
                accelerate_config = None
                if num_gpus == 1:
                    accelerate_config = "accelerate_configs/uncompiled_1.yaml"
                elif num_gpus == 2:
                    accelerate_config = "accelerate_configs/uncompiled_2.yaml"
                elif num_gpus == 4:
                    accelerate_config = "accelerate_configs/uncompiled_4.yaml"
                elif num_gpus == 8:
                    accelerate_config = "accelerate_configs/uncompiled_8.yaml"
                else:
                    # Default to 1 GPU config if no matching config is found
                    accelerate_config = "accelerate_configs/uncompiled_1.yaml"
                    num_gpus = 1
                    visible_devices = "0"

                # Configure accelerate parameters
                accelerate_args = [
                    "accelerate", "launch",
                    "--config_file", accelerate_config,
                    "--gpu_ids", visible_devices,
                    "--mixed_precision=bf16",
                    "--num_processes=" + str(num_gpus),
                    "--num_machines=1",
                    "--dynamo_backend=no",
                    str(train_script)
                ]
                
                # Log the full command for debugging
                command_str = ' '.join(accelerate_args + config_args)
                self.append_log(f"Command: {command_str}")
                logger.info(f"Executing command: {command_str}")
                
                launch_args = accelerate_args
            
            # Set environment variables
            env = os.environ.copy()
            env["NCCL_P2P_DISABLE"] = "1"
            env["TORCH_NCCL_ENABLE_MONITORING"] = "0"
            env["WANDB_MODE"] = "offline"
            env["HF_API_TOKEN"] = HF_API_TOKEN
            env["FINETRAINERS_LOG_LEVEL"] = "DEBUG"  # Added for better debugging
            env["CUDA_VISIBLE_DEVICES"] = visible_devices

            #if progress:
            #    progress(0.9, desc="Launching training process")

            # Start the training process
            process = subprocess.Popen(
                launch_args + config_args,
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
                start_new_session=True,
                env=env,
                cwd=str(current_dir),
                bufsize=1,
                universal_newlines=True
            )
            
            logger.info(f"Started process with PID: {process.pid}")
            
            with open(self.app.output_pid_file, 'w') as f:
                f.write(str(process.pid))
            
            # Get current UI state for all parameters
            current_state = self.load_ui_state()
            
            # Build session data
            session_data = {
                "model_type": model_type,
                "model_version": model_version,
                "training_type": training_type,
                "lora_rank": lora_rank,
                "lora_alpha": lora_alpha,
                "train_steps": train_steps,
                "batch_size": batch_size,
                "learning_rate": learning_rate,
                "save_iterations": save_iterations,
                "num_gpus": num_gpus,
                "precomputation_items": precomputation_items,
                "lr_warmup_steps": lr_warmup_steps,
                "repo_id": repo_id,
                "start_time": datetime.now().isoformat()
            }
            
            # Add control parameters if relevant
            if training_type in ["control-lora", "control-full-finetune"]:
                session_data.update({
                    "control_type": current_state.get("control_type", DEFAULT_CONTROL_TYPE),
                    "train_qk_norm": current_state.get("train_qk_norm", DEFAULT_TRAIN_QK_NORM),
                    "frame_conditioning_type": current_state.get("frame_conditioning_type", DEFAULT_FRAME_CONDITIONING_TYPE),
                    "frame_conditioning_index": current_state.get("frame_conditioning_index", DEFAULT_FRAME_CONDITIONING_INDEX),
                    "frame_conditioning_concatenate_mask": current_state.get("frame_conditioning_concatenate_mask", DEFAULT_FRAME_CONDITIONING_CONCATENATE_MASK)
                })
            
            # Save session
            self.save_session(session_data)
            
            # Update initial training status
            total_steps = int(train_steps)
            self.save_status(
                state='training',
                step=0,
                total_steps=total_steps,
                loss=0.0,
                message='Training started',
                repo_id=repo_id,
                model_type=model_type,
                training_type=training_type
            )
            
            # Start monitoring process output
            self._start_log_monitor(process)
            
            success_msg = f"Started {training_type} training for {model_type} model"
            self.append_log(success_msg)
            logger.info(success_msg)
            
            # Final progress update - now we'll track it through the log monitor
            #if progress:
            #    progress(1.0, desc="Training started successfully")

            return success_msg, self.get_logs()
            
        except Exception as e:
            error_msg = f"Error {'resuming' if is_resuming else 'starting'} training: {str(e)}"
            self.append_log(error_msg)
            logger.exception("Training startup failed")
            traceback.print_exc()
            return f"Error {'resuming' if is_resuming else 'starting'} training", error_msg
            
    def stop_training(self) -> Tuple[str, str]:
        """Stop training process"""
        if not self.app.output_pid_file.exists():
            return "No training process found", self.get_logs()
            
        try:
            with open(self.app.output_pid_file, 'r') as f:
                pid = int(f.read().strip())
                    
            if psutil.pid_exists(pid):
                os.killpg(os.getpgid(pid), signal.SIGTERM)
                    
            if self.app.output_pid_file.exists():
                self.app.output_pid_file.unlink()
                    
            self.append_log("Training process stopped")
            self.save_status(state='stopped', message='Training stopped')
                
            return "Training stopped successfully", self.get_logs()
                
        except Exception as e:
            error_msg = f"Error stopping training: {str(e)}"
            self.append_log(error_msg)
            if self.app.output_pid_file.exists():
                self.app.output_pid_file.unlink()
            return "Error stopping training", error_msg

    def pause_training(self) -> Tuple[str, str]:
        """Pause training process by sending SIGUSR1"""
        if not self.is_training_running():
            return "No training process found", self.get_logs()
            
        try:
            with open(self.app.output_pid_file, 'r') as f:
                pid = int(f.read().strip())
                
            if psutil.pid_exists(pid):
                os.kill(pid, signal.SIGUSR1)  # Signal to pause
                self.save_status(state='paused', message='Training paused')
                self.append_log("Training paused")
                
            return "Training paused", self.get_logs()

        except Exception as e:
            error_msg = f"Error pausing training: {str(e)}"
            self.append_log(error_msg)
            return "Error pausing training", error_msg

    def resume_training(self) -> Tuple[str, str]:
        """Resume training process by sending SIGUSR2"""
        if not self.is_training_running():
            return "No training process found", self.get_logs()
            
        try:
            with open(self.app.output_pid_file, 'r') as f:
                pid = int(f.read().strip())
                
            if psutil.pid_exists(pid):
                os.kill(pid, signal.SIGUSR2)  # Signal to resume
                self.save_status(state='training', message='Training resumed')
                self.append_log("Training resumed")
                
            return "Training resumed", self.get_logs()

        except Exception as e:
            error_msg = f"Error resuming training: {str(e)}"
            self.append_log(error_msg)
            return "Error resuming training", error_msg

    def is_training_running(self) -> bool:
        """Check if training is currently running"""
        if not self.app.output_pid_file.exists():
            return False
            
        try:
            with open(self.app.output_pid_file, 'r') as f:
                pid = int(f.read().strip())
            
            # Check if process exists AND is a Python process running train.py
            if psutil.pid_exists(pid):
                try:
                    process = psutil.Process(pid)
                    cmdline = process.cmdline()
                    # Check if it's a Python process running train.py
                    return any('train.py' in cmd for cmd in cmdline)
                except (psutil.NoSuchProcess, psutil.AccessDenied):
                    return False
            return False
        except:
            return False

    def validate_and_find_valid_checkpoint(self) -> Optional[str]:
        """Validate checkpoint directories and find the most recent valid one
        
        Returns:
            Path to valid checkpoint directory or None if no valid checkpoint found
        """
        # Find all checkpoint directories
        checkpoints = list(self.app.output_path.glob("finetrainers_step_*"))
        if not checkpoints:
            logger.info("No checkpoint directories found")
            return None
            
        # Sort by step number in descending order (latest first)
        sorted_checkpoints = sorted(checkpoints, key=lambda x: int(x.name.split("_")[-1]), reverse=True)
        
        corrupted_checkpoints = []
        
        for checkpoint_dir in sorted_checkpoints:
            step_num = int(checkpoint_dir.name.split("_")[-1])
            logger.info(f"Validating checkpoint at step {step_num}: {checkpoint_dir}")
            
            # Check if the .metadata file exists (indicator of complete checkpoint)
            metadata_file = checkpoint_dir / ".metadata"
            if not metadata_file.exists():
                logger.warning(f"Checkpoint {checkpoint_dir.name} is corrupted: missing .metadata file")
                corrupted_checkpoints.append(checkpoint_dir)
                continue
            
            # .metadata file exists, checkpoint is considered valid
            # We don't read the file contents to avoid encoding/parsing issues
            logger.info(f"Checkpoint {checkpoint_dir.name} is valid")
            
            # Clean up any corrupted checkpoints we found before this valid one
            if corrupted_checkpoints:
                self.cleanup_corrupted_checkpoints(corrupted_checkpoints)
            
            return str(checkpoint_dir)
        
        # If we reach here, all checkpoints are corrupted
        if corrupted_checkpoints:
            logger.error("All checkpoint directories are corrupted")
            self.cleanup_corrupted_checkpoints(corrupted_checkpoints)
        
        return None

    def cleanup_corrupted_checkpoints(self, corrupted_checkpoints: List[Path]) -> None:
        """Remove corrupted checkpoint directories
        
        Args:
            corrupted_checkpoints: List of corrupted checkpoint directory paths
        """
        for checkpoint_dir in corrupted_checkpoints:
            try:
                step_num = int(checkpoint_dir.name.split("_")[-1])
                logger.info(f"Removing corrupted checkpoint at step {step_num}: {checkpoint_dir}")
                shutil.rmtree(checkpoint_dir)
                self.append_log(f"Removed corrupted checkpoint: {checkpoint_dir.name}")
            except Exception as e:
                logger.error(f"Failed to remove corrupted checkpoint {checkpoint_dir}: {e}")
                self.append_log(f"Failed to remove corrupted checkpoint {checkpoint_dir.name}: {e}")

    def cleanup_old_lora_weights(self, max_to_keep: int = 2) -> None:
        """Remove old LoRA weight directories, keeping only the most recent ones
        
        Args:
            max_to_keep: Maximum number of LoRA weight directories to keep (default: 2)
        """
        lora_weights_path = self.app.output_path / "lora_weights"
        
        if not lora_weights_path.exists():
            logger.debug("LoRA weights directory does not exist, nothing to clean up")
            return
        
        # Find all LoRA weight directories (should be named with step numbers)
        lora_dirs = []
        for item in lora_weights_path.iterdir():
            if item.is_dir() and item.name.isdigit():
                lora_dirs.append(item)
        
        if len(lora_dirs) <= max_to_keep:
            logger.debug(f"Found {len(lora_dirs)} LoRA weight directories, no cleanup needed (keeping {max_to_keep})")
            return
        
        # Sort by step number (directory name) in descending order (newest first)
        lora_dirs_sorted = sorted(lora_dirs, key=lambda x: int(x.name), reverse=True)
        
        # Keep the most recent max_to_keep directories, remove the rest
        dirs_to_keep = lora_dirs_sorted[:max_to_keep]
        dirs_to_remove = lora_dirs_sorted[max_to_keep:]
        
        logger.info(f"Cleaning up old LoRA weights: keeping {len(dirs_to_keep)}, removing {len(dirs_to_remove)}")
        self.append_log(f"Cleaning up old LoRA weights: keeping latest {max_to_keep} directories")
        
        for lora_dir in dirs_to_remove:
            try:
                step_num = int(lora_dir.name)
                logger.info(f"Removing old LoRA weights at step {step_num}: {lora_dir}")
                shutil.rmtree(lora_dir)
                self.append_log(f"Removed old LoRA weights: step {step_num}")
            except Exception as e:
                logger.error(f"Failed to remove old LoRA weights {lora_dir}: {e}")
                self.append_log(f"Failed to remove old LoRA weights {lora_dir.name}: {e}")
        
        # Log what we kept
        kept_steps = [int(d.name) for d in dirs_to_keep]
        kept_steps.sort(reverse=True)
        logger.info(f"Kept LoRA weights for steps: {kept_steps}")
        self.append_log(f"Kept LoRA weights for steps: {kept_steps}")

    def _background_cleanup_task(self) -> None:
        """Background task that runs every 10 minutes to clean up old LoRA weights"""
        cleanup_interval = 600  # 10 minutes in seconds
        
        logger.info("Started background LoRA cleanup task (runs every 10 minutes)")
        
        while not self._cleanup_stop_event.is_set():
            try:
                # Wait for 10 minutes or until stop event is set
                if self._cleanup_stop_event.wait(timeout=cleanup_interval):
                    break  # Stop event was set
                
                # Only run cleanup if we have an output path
                if hasattr(self.app, 'output_path') and self.app.output_path:
                    lora_weights_path = self.app.output_path / "lora_weights"
                    
                    # Only cleanup if the directory exists and has content
                    if lora_weights_path.exists():
                        lora_dirs = [d for d in lora_weights_path.iterdir() if d.is_dir() and d.name.isdigit()]
                        
                        if len(lora_dirs) > 2:
                            logger.info(f"Background cleanup: Found {len(lora_dirs)} LoRA weight directories, cleaning up old ones")
                            self.cleanup_old_lora_weights(max_to_keep=2)
                        else:
                            logger.debug(f"Background cleanup: Found {len(lora_dirs)} LoRA weight directories, no cleanup needed")
                
            except Exception as e:
                logger.error(f"Background LoRA cleanup task error: {e}")
                # Continue running despite errors
        
        logger.info("Background LoRA cleanup task stopped")

    def stop_background_cleanup(self) -> None:
        """Stop the background cleanup task"""
        if hasattr(self, '_cleanup_stop_event'):
            self._cleanup_stop_event.set()
        if hasattr(self, '_cleanup_thread') and self._cleanup_thread.is_alive():
            self._cleanup_thread.join(timeout=5)
            logger.info("Background cleanup task stopped")

    def recover_interrupted_training(self) -> Dict[str, Any]:
        """Attempt to recover interrupted training
        
        Returns:
            Dict with recovery status and UI updates
        """
        status = self.get_status()
        ui_updates = {}
        
        # Check for any valid checkpoints, even if status doesn't indicate training
        valid_checkpoint = self.validate_and_find_valid_checkpoint()
        has_checkpoints = valid_checkpoint is not None
        
        # If status indicates training but process isn't running, or if we have checkpoints
        # and no active training process, try to recover
        if (status.get('status') in ['training', 'paused'] and not self.is_training_running()) or \
        (has_checkpoints and not self.is_training_running()):
            
            logger.info("Detected interrupted training session or existing checkpoints, attempting to recover...")
            
            # Get the latest checkpoint
            last_session = self.load_session()
            
            if not last_session:
                logger.warning("No session data found for recovery, but will check for checkpoints")
                # Try to create a default session based on UI state if we have checkpoints
                if has_checkpoints:
                    ui_state = self.load_ui_state()
                    # Create a default session using UI state values
                    last_session = {
                        "params": {
                            "model_type": MODEL_TYPES.get(ui_state.get("model_type", list(MODEL_TYPES.keys())[0])),
                            "model_version":  ui_state.get("model_version", ""),
                            "training_type": TRAINING_TYPES.get(ui_state.get("training_type", list(TRAINING_TYPES.keys())[0])),
                            "lora_rank": ui_state.get("lora_rank", DEFAULT_LORA_RANK_STR),
                            "lora_alpha": ui_state.get("lora_alpha", DEFAULT_LORA_ALPHA_STR),
                            "train_steps": ui_state.get("train_steps", DEFAULT_NB_TRAINING_STEPS),
                            "batch_size": ui_state.get("batch_size", DEFAULT_BATCH_SIZE),
                            "learning_rate": ui_state.get("learning_rate", DEFAULT_LEARNING_RATE),
                            "save_iterations": ui_state.get("save_iterations", DEFAULT_SAVE_CHECKPOINT_EVERY_N_STEPS),
                            "resolution": ui_state.get("resolution", list(RESOLUTION_OPTIONS.keys())[0]),
                            "repo_id": "",  # Default empty repo ID,
                            "auto_resume": ui_state.get("auto_resume", DEFAULT_AUTO_RESUME)
                        }
                    }
                    logger.info("Created default session from UI state for recovery")
                else:
                    logger.warning(f"No checkpoints found for recovery")
                    # Set buttons for no active training
                    ui_updates = {
                        "start_btn": {"interactive": True, "variant": "primary", "value": "Start Training"},
                        "stop_btn": {"interactive": False, "variant": "secondary", "value": "Stop at Last Checkpoint"},
                        "delete_checkpoints_btn": {"interactive": False, "variant": "stop", "value": "Delete All Checkpoints"},
                        "pause_resume_btn": {"interactive": False, "variant": "secondary", "visible": False}
                    }
                    return {"status": "idle", "message": "No training in progress", "ui_updates": ui_updates}
                
            # Use the valid checkpoint we found
            latest_checkpoint = None
            checkpoint_step = 0
            
            if has_checkpoints and valid_checkpoint:
                checkpoint_step = int(Path(valid_checkpoint).name.split("_")[-1])
                logger.info(f"Found valid checkpoint at step {checkpoint_step}")

                # both options are valid, but imho it is easier to just return "latest"
                # under the hood Finetrainers will convert ("latest") to (-1)
                #latest_checkpoint = int(checkpoint_step)
                latest_checkpoint = "latest"
            else:
                logger.warning("No checkpoints found for recovery")
                # Set buttons for no active training
                ui_updates = {
                    "start_btn": {"interactive": True, "variant": "primary", "value": "Start Training"},
                    "stop_btn": {"interactive": False, "variant": "secondary", "value": "Stop at Last Checkpoint"},
                    "delete_checkpoints_btn": {"interactive": False, "variant": "stop", "value": "Delete All Checkpoints"},
                    "pause_resume_btn": {"interactive": False, "variant": "secondary", "visible": False}
                }
                return {"status": "error", "message": "No checkpoints found", "ui_updates": ui_updates}
            
            # Extract parameters from the saved session (not current UI state)
            # This ensures we use the original training parameters
            params = last_session.get('params', {})
            
            # Map internal model type back to display name for UI
            model_type_internal = params.get('model_type')
            model_type_display = model_type_internal
            
            # Find the display name that maps to our internal model type
            for display_name, internal_name in MODEL_TYPES.items():
                if internal_name == model_type_internal:
                    model_type_display = display_name
                    logger.info(f"Mapped internal model type '{model_type_internal}' to display name '{model_type_display}'")
                    break
            
            # Get training type (default to LoRA if not present in saved session)
            training_type_internal = params.get('training_type', 'lora')
            training_type_display = next((disp for disp, val in TRAINING_TYPES.items() if val == training_type_internal), list(TRAINING_TYPES.keys())[0])
            
            # Add UI updates to restore the training parameters in the UI
            # This shows the user what values are being used for the resumed training
            ui_updates.update({
                "model_type": model_type_display,
                "model_version": params.get('model_version', ''),
                "training_type": training_type_display,
                "lora_rank": params.get('lora_rank', DEFAULT_LORA_RANK_STR),
                "lora_alpha": params.get('lora_alpha', DEFAULT_LORA_ALPHA_STR),
                "train_steps": params.get('train_steps', DEFAULT_NB_TRAINING_STEPS),
                "batch_size": params.get('batch_size', DEFAULT_BATCH_SIZE),
                "learning_rate": params.get('learning_rate', DEFAULT_LEARNING_RATE),
                "save_iterations": params.get('save_iterations', DEFAULT_SAVE_CHECKPOINT_EVERY_N_STEPS),
                "resolution": params.get('resolution', list(RESOLUTION_OPTIONS.keys())[0]),
                "auto_resume": params.get("auto_resume", DEFAULT_AUTO_RESUME)
            })
            
            # Check if we should auto-recover (immediate restart)
            ui_state = self.load_ui_state()
            auto_recover = ui_state.get("auto_resume", DEFAULT_AUTO_RESUME)
            logger.info(f"Auto-resume is {'enabled' if auto_recover else 'disabled'}")

            if auto_recover:
                try:
                    result = self.start_training(
                        model_type=model_type_internal,
                        lora_rank=params.get('lora_rank', DEFAULT_LORA_RANK_STR),
                        lora_alpha=params.get('lora_alpha', DEFAULT_LORA_ALPHA_STR),
                        train_steps=params.get('train_steps', DEFAULT_NB_TRAINING_STEPS),
                        batch_size=params.get('batch_size', DEFAULT_BATCH_SIZE),
                        learning_rate=params.get('learning_rate', DEFAULT_LEARNING_RATE),
                        save_iterations=params.get('save_iterations', DEFAULT_SAVE_CHECKPOINT_EVERY_N_STEPS),
                        model_version=params.get('model_version', ''),
                        repo_id=params.get('repo_id', ''),
                        training_type=training_type_internal,
                        resume_from_checkpoint="latest"
                    )
                    # Set buttons for active training
                    ui_updates.update({
                        "start_btn": {"interactive": False, "variant": "secondary", "value": "Start over a new training"},
                        "stop_btn": {"interactive": True, "variant": "primary", "value": "Stop at Last Checkpoint"},
                        "delete_checkpoints_btn": {"interactive": False, "variant": "stop", "value": "Delete All Checkpoints"},
                        "pause_resume_btn": {"interactive": False, "variant": "secondary", "visible": False}
                    })

                    return {
                        "status": "recovered", 
                        "message": f"Training resumed from checkpoint {checkpoint_step}",
                        "result": result,
                        "ui_updates": ui_updates
                    }
                except Exception as e:
                    logger.error(f"Failed to auto-resume training: {str(e)}")
                    # Set buttons for manual recovery
                    ui_updates.update({
                        "start_btn": {"interactive": True, "variant": "primary", "value": "Start over a new training"},
                        "stop_btn": {"interactive": False, "variant": "secondary", "value": "Stop at Last Checkpoint"},
                        "delete_checkpoints_btn": {"interactive": True, "variant": "stop", "value": "Delete All Checkpoints"},
                        "pause_resume_btn": {"interactive": False, "variant": "secondary", "visible": False}
                    })
                    return {"status": "error", "message": f"Failed to auto-resume: {str(e)}", "ui_updates": ui_updates}
                else:
                    # Set up UI for manual recovery
                    ui_updates.update({
                        "start_btn": {"interactive": True, "variant": "primary", "value": "Start over a new training"},
                        "stop_btn": {"interactive": False, "variant": "secondary", "value": "Stop at Last Checkpoint"},
                        "pause_resume_btn": {"interactive": False, "variant": "secondary", "visible": False}
                    })
                    return {"status": "ready_to_recover", "message": f"Ready to resume from checkpoint {checkpoint_step}", "ui_updates": ui_updates}
            
        elif self.is_training_running():
            # Process is still running, set buttons accordingly
            ui_updates = {
                "start_btn": {"interactive": False, "variant": "secondary", "value": "Start over a new training" if has_checkpoints else "Start Training"},
                "stop_btn": {"interactive": True, "variant": "primary", "value": "Stop at Last Checkpoint"},
                "pause_resume_btn": {"interactive": False, "variant": "secondary", "visible": False},
                "delete_checkpoints_btn": {"interactive": False, "variant": "stop", "value": "Delete All Checkpoints"}
            }
            return {"status": "running", "message": "Training process is running", "ui_updates": ui_updates}
        else:
            # No training process, set buttons to default state
            button_text = "Start over a new training" if has_checkpoints else "Start Training"
            ui_updates = {
                "start_btn": {"interactive": True, "variant": "primary", "value": button_text},
                "stop_btn": {"interactive": False, "variant": "secondary", "value": "Stop at Last Checkpoint"},
                "pause_resume_btn": {"interactive": False, "variant": "secondary", "visible": False},
                "delete_checkpoints_btn": {"interactive": has_checkpoints, "variant": "stop", "value": "Delete All Checkpoints"}
            }
            return {"status": "idle", "message": "No training in progress", "ui_updates": ui_updates}
            
    def delete_all_checkpoints(self) -> str:
        """Delete all checkpoints in the output directory.
        
        Returns:
            Status message
        """
        if self.is_training_running():
            return "Cannot delete checkpoints while training is running. Stop training first."

        try:
     
            # Find all checkpoint directories
            checkpoints = list(self.app.output_path.glob("finetrainers_step_*"))
            
            if not checkpoints:
                return "No checkpoints found to delete."
                
            # Delete each checkpoint directory
            for checkpoint in checkpoints:
                if checkpoint.is_dir():
                    shutil.rmtree(checkpoint)
                    
            # Also delete session.json which contains previous training info
            if self.app.output_session_file.exists():
                self.app.output_session_file.unlink()
                
            # Reset status file to idle
            self.save_status(state='idle', message='No training in progress')
            
            self.append_log(f"Deleted {len(checkpoints)} checkpoint(s)")
            return f"Successfully deleted {len(checkpoints)} checkpoint(s)"
            
        except Exception as e:
            error_msg = f"Error deleting checkpoints: {str(e)}"
            self.append_log(error_msg)
            return error_msg

    def clear_training_data(self) -> str:
        """Clear all training data"""
        if self.is_training_running():
            return gr.Error("Cannot clear data while training is running")
        
        try:
            for file in self.app.training_videos_path.glob("*.*"):
                file.unlink()
            for file in self.app.training_path.glob("*.*"):
                file.unlink()
            
            self.append_log("Cleared all training data")
            return "Training data cleared successfully"
            
        except Exception as e:
            error_msg = f"Error clearing training data: {str(e)}"
            self.append_log(error_msg)
            return error_msg
    
    def save_status(self, state: str, **kwargs) -> None:
        """Save current training status"""
        status = {
            'status': state,
            'timestamp': datetime.now().isoformat(),
            **kwargs
        }
        if state == "Training started" or state == "initializing":
            gr.Info("Initializing model and dataset..")
        elif state == "training":
            #gr.Info("Training started!")
            # Training is in progress
            pass
        elif state == "completed":
            gr.Info("Training completed!")

        with open(self.app.output_status_file, 'w') as f:
            json.dump(status, f, indent=2)

    def _start_log_monitor(self, process: subprocess.Popen) -> None:
        """Start monitoring process output for logs"""
        
        def monitor():
            self.append_log("Starting log monitor thread")
            
            def read_stream(stream, is_error=False):
                if stream:
                    output = stream.readline()
                    if output:
                        # Remove decode() since output is already a string due to universal_newlines=True
                        line = output.strip()
                        self.append_log(line)
                        if is_error:
                            #logger.error(line)
                            pass
                        
                        # Parse metrics only from stdout
                        metrics = parse_training_log(line)
                        if metrics:
                            # Get current status first
                            current_status = self.get_status()
                            
                            # Update with new metrics
                            current_status.update(metrics)
                            
                            # Ensure 'state' is present, use current status if available, default to 'training'
                            if 'status' in current_status:
                                # Use 'status' as 'state' to match the required parameter
                                state = current_status.pop('status', 'training')
                                self.save_status(state, **current_status)
                            else:
                                # If no status in the current_status, use 'training' as the default state
                                self.save_status('training', **current_status)
                        return True
                return False

            # Create separate threads to monitor stdout and stderr
            def monitor_stream(stream, is_error=False):
                while process.poll() is None:
                    if not read_stream(stream, is_error):
                        time.sleep(0.1)  # Short sleep to avoid CPU thrashing
            
            # Start threads to monitor each stream
            stdout_thread = threading.Thread(target=monitor_stream, args=(process.stdout, False))
            stderr_thread = threading.Thread(target=monitor_stream, args=(process.stderr, True))
            stdout_thread.daemon = True
            stderr_thread.daemon = True
            stdout_thread.start()
            stderr_thread.start()
            
            # Wait for process to complete
            process.wait()
            
            # Wait for threads to finish reading any remaining output
            stdout_thread.join(timeout=2)
            stderr_thread.join(timeout=2)
            
            # Process any remaining output after process ends
            while read_stream(process.stdout):
                pass
            while read_stream(process.stderr, True):
                pass
                    
            # Process finished
            return_code = process.poll()
            if return_code == 0:
                success_msg = "Training completed successfully"
                self.append_log(success_msg)
                gr.Info(success_msg)
                self.save_status(state='completed', message=success_msg)
                
                # Clean up old LoRA weights to save disk space
                try:
                    self.cleanup_old_lora_weights(max_to_keep=2)
                except Exception as e:
                    logger.warning(f"Failed to cleanup old LoRA weights: {e}")
                    self.append_log(f"Warning: Failed to cleanup old LoRA weights: {e}")
                
                # Upload final model if repository was specified
                session = self.load_session()
                if session and session['params'].get('repo_id'):
                    repo_id = session['params']['repo_id']
                    latest_run = max(Path(self.app.output_path).glob('*'), key=os.path.getmtime)
                    if self.upload_to_hub(latest_run, repo_id):
                        self.append_log(f"Model uploaded to {repo_id}")
                    else:
                        self.append_log("Failed to upload model to hub")
            else:
                error_msg = f"Training failed with return code {return_code}"
                self.append_log(error_msg)
                logger.error(error_msg)
                self.save_status(state='error', message=error_msg)
            
            # Clean up PID file
            if self.app.output_pid_file.exists():
                self.app.output_pid_file.unlink()
        
        monitor_thread = threading.Thread(target=monitor)
        monitor_thread.daemon = True
        monitor_thread.start()

    def upload_to_hub(self, model_path: Path, repo_id: str) -> bool:
        """Upload model to Hugging Face Hub
        
        Args:
            model_path: Path to model files
            repo_id: Repository ID (username/model-name)
            
        Returns:
            bool: Whether upload was successful
        """
        try:
            token = os.getenv("HF_API_TOKEN")
            if not token:
                self.append_log("Error: HF_API_TOKEN not set")
                return False
                
            # Create or get repo
            create_repo(repo_id, token=token, repo_type="model", exist_ok=True)
            
            # Upload files
            upload_folder(
                folder_path=str(self.app.output_path),
                repo_id=repo_id,
                repo_type="model",
                commit_message="Training completed"
            )
            
            return True
        except Exception as e:
            self.append_log(f"Error uploading to hub: {str(e)}")
            return False

    def get_model_output_info(self) -> Dict[str, Any]:
        """Return info about the model safetensors including path and step count
        
        Returns:
            Dict with 'path' (str or None) and 'steps' (int or None)
        """
        result = {"path": None, "steps": None}
        
        # Check if the root level file exists (this should be the primary location)
        model_output_safetensors_path = self.app.output_path / "pytorch_lora_weights.safetensors"
        if model_output_safetensors_path.exists():
            result["path"] = str(model_output_safetensors_path) 
            # For root level, we can't determine steps easily, so return None
            return result
        
        # Check in lora_weights directory
        lora_weights_dir = self.app.output_path / "lora_weights"
        if lora_weights_dir.exists():
            logger.info(f"Found lora_weights directory: {lora_weights_dir}")
            
            # Look for the latest checkpoint directory in lora_weights
            lora_checkpoints = [d for d in lora_weights_dir.glob("*") if d.is_dir() and d.name.isdigit()]
            if lora_checkpoints:
                latest_lora_checkpoint = max(lora_checkpoints, key=lambda x: int(x.name))
                logger.info(f"Found latest LoRA checkpoint: {latest_lora_checkpoint}")
                
                # Extract step count from directory name
                result["steps"] = int(latest_lora_checkpoint.name)
                
                # List contents of the latest checkpoint directory
                checkpoint_contents = list(latest_lora_checkpoint.glob("*"))
                logger.info(f"Contents of LoRA checkpoint {latest_lora_checkpoint.name}: {checkpoint_contents}")
                
                # Check for weights in the latest LoRA checkpoint
                lora_safetensors = latest_lora_checkpoint / "pytorch_lora_weights.safetensors"
                if lora_safetensors.exists():
                    logger.info(f"Found weights in latest LoRA checkpoint: {lora_safetensors}")
                    result["path"] = str(lora_safetensors)
                    return result
                
                # Also check for other common weight file names
                possible_weight_files = [
                    "pytorch_lora_weights.safetensors",
                    "adapter_model.safetensors", 
                    "pytorch_model.safetensors",
                    "model.safetensors"
                ]
                
                for weight_file in possible_weight_files:
                    weight_path = latest_lora_checkpoint / weight_file
                    if weight_path.exists():
                        logger.info(f"Found weights file {weight_file} in latest LoRA checkpoint: {weight_path}")
                        result["path"] = str(weight_path)
                        return result
                
                # Check if any .safetensors files exist
                safetensors_files = list(latest_lora_checkpoint.glob("*.safetensors"))
                if safetensors_files:
                    logger.info(f"Found .safetensors files in LoRA checkpoint: {safetensors_files}")
                    # Return the first .safetensors file found
                    result["path"] = str(safetensors_files[0])
                    return result
            
            # Fallback: check for direct safetensors file in lora_weights root
            lora_safetensors = lora_weights_dir / "pytorch_lora_weights.safetensors"
            if lora_safetensors.exists():
                logger.info(f"Found weights in lora_weights directory: {lora_safetensors}")
                result["path"] = str(lora_safetensors)
                return result
            else:
                logger.info(f"pytorch_lora_weights.safetensors not found in lora_weights directory")
        
        # If not found in root or lora_weights, log the issue and check fallback
        logger.warning(f"Model weights not found at expected location: {model_output_safetensors_path}")
        logger.info(f"Checking output directory contents: {list(self.app.output_path.glob('*'))}")
        
        # Check if there are any checkpoint directories as a fallback
        checkpoints = list(self.app.output_path.glob("finetrainers_step_*"))
        if checkpoints:
            logger.info(f"Found {len(checkpoints)} checkpoint directories, but main weights file is missing")
            latest_checkpoint = max(checkpoints, key=lambda x: int(x.name.split("_")[-1]))
            logger.info(f"Latest checkpoint directory: {latest_checkpoint}")
            
            # Extract step count from checkpoint directory name
            result["steps"] = int(latest_checkpoint.name.split("_")[-1])
            
            # Log contents of latest checkpoint
            checkpoint_contents = list(latest_checkpoint.glob("*"))
            logger.info(f"Contents of latest checkpoint {latest_checkpoint.name}: {checkpoint_contents}")
            
            checkpoint_weights = latest_checkpoint / "pytorch_lora_weights.safetensors"
            if checkpoint_weights.exists():
                logger.info(f"Found weights in latest checkpoint: {checkpoint_weights}")
                result["path"] = str(checkpoint_weights)
                return result
            else:
                logger.info(f"pytorch_lora_weights.safetensors not found in checkpoint directory")
        
        return result

    def get_model_output_safetensors(self) -> Optional[str]:
        """Return the path to the model safetensors
        
        Returns:
            Path to safetensors file or None if not found
        """
        return self.get_model_output_info()["path"]

    def create_training_dataset_zip(self) -> str:
        """Create a ZIP file containing all training data
        
            
        Returns:
            Path to created ZIP file
        """

        # Create temporary zip file
        with tempfile.NamedTemporaryFile(suffix='.zip', delete=False) as temp_zip:
            temp_zip_path = str(temp_zip.name)
            print(f"Creating zip file for {self.app.training_path}..")
            try:
                make_archive(self.app.training_path, temp_zip_path)
                print(f"Zip file created!")
                return temp_zip_path
            except Exception as e:
                print(f"Failed to create zip: {str(e)}")
                raise gr.Error(f"Failed to create zip: {str(e)}")

    def create_output_directory_zip(self) -> str:
        """Create a ZIP file containing all output data (checkpoints, models, etc.)
        
        Returns:
            Path to created ZIP file
        """
        # Create temporary zip file
        with tempfile.NamedTemporaryFile(suffix='.zip', delete=False) as temp_zip:
            temp_zip_path = str(temp_zip.name)
            print(f"Creating zip file for {self.app.output_path}..")
            try:
                make_archive(self.app.output_path, temp_zip_path)
                print(f"Output zip file created!")
                return temp_zip_path
            except Exception as e:
                print(f"Failed to create output zip: {str(e)}")
                raise gr.Error(f"Failed to create output zip: {str(e)}")

    def create_checkpoint_zip(self) -> Optional[str]:
        """Create a ZIP file containing the latest finetrainers checkpoint
        
        Returns:
            Path to created ZIP file or None if no checkpoint found
        """
        # Find all checkpoint directories
        checkpoints = list(self.app.output_path.glob("finetrainers_step_*"))
        if not checkpoints:
            logger.info("No checkpoint directories found")
            raise gr.Error("No checkpoint directories found")
        
        # Get the latest checkpoint by step number
        latest_checkpoint = max(checkpoints, key=lambda x: int(x.name.split("_")[-1]))
        step_num = int(latest_checkpoint.name.split("_")[-1])
        
        # Create temporary zip file
        with tempfile.NamedTemporaryFile(suffix='.zip', delete=False) as temp_zip:
            temp_zip_path = str(temp_zip.name)
            print(f"Creating zip file for checkpoint {latest_checkpoint.name}..")
            try:
                make_archive(latest_checkpoint, temp_zip_path)
                print(f"Checkpoint zip file created for step {step_num}!")
                return temp_zip_path
            except Exception as e:
                print(f"Failed to create checkpoint zip: {str(e)}")
                raise gr.Error(f"Failed to create checkpoint zip: {str(e)}")

    def get_checkpoint_button_text(self) -> str:
        """Get the dynamic text for the download checkpoint button based on available checkpoints"""
        try:
            checkpoints = list(self.app.output_path.glob("finetrainers_step_*"))
            if not checkpoints:
                return "📥 Download checkpoints (not available)"
            
            # Get the latest checkpoint by step number
            latest_checkpoint = max(checkpoints, key=lambda x: int(x.name.split("_")[-1]))
            step_num = int(latest_checkpoint.name.split("_")[-1])
            return f"📥 Download checkpoints (step {step_num})"
        except Exception as e:
            logger.warning(f"Error getting checkpoint info for button text: {e}")
            return "📥 Download checkpoints (not available)"