"""
Utility functions for FLUX Prompt Optimizer
Clean, focused, and reusable utilities
"""

import re
import logging
import gc
from typing import Optional, Tuple, Dict, Any, List
from PIL import Image
import torch
import numpy as np

from config import PROCESSING_CONFIG, FLUX_RULES

# Configure logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)


def setup_logging(level: str = "INFO") -> None:
    """Setup logging configuration"""
    logging.basicConfig(
        level=getattr(logging, level.upper()),
        format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
    )


def optimize_image(image: Any) -> Optional[Image.Image]:
    """
    Optimize image for processing
    
    Args:
        image: Input image (PIL, numpy array, or file path)
        
    Returns:
        Optimized PIL Image or None if failed
    """
    if image is None:
        return None
        
    try:
        # Convert to PIL Image if necessary
        if isinstance(image, np.ndarray):
            image = Image.fromarray(image)
        elif isinstance(image, str):
            image = Image.open(image)
        elif not isinstance(image, Image.Image):
            logger.error(f"Unsupported image type: {type(image)}")
            return None
        
        # Convert to RGB if necessary
        if image.mode != 'RGB':
            image = image.convert('RGB')
        
        # Resize if too large
        max_size = PROCESSING_CONFIG["max_image_size"]
        if image.size[0] > max_size or image.size[1] > max_size:
            image.thumbnail((max_size, max_size), Image.Resampling.LANCZOS)
            logger.info(f"Image resized to {image.size}")
        
        return image
        
    except Exception as e:
        logger.error(f"Image optimization failed: {e}")
        return None


def validate_image(image: Any) -> bool:
    """
    Validate if image is processable
    
    Args:
        image: Input image to validate
        
    Returns:
        True if valid, False otherwise
    """
    if image is None:
        return False
        
    try:
        optimized = optimize_image(image)
        return optimized is not None
    except Exception:
        return False


def clean_memory() -> None:
    """Clean up memory and GPU cache"""
    try:
        gc.collect()
        if torch.cuda.is_available():
            torch.cuda.empty_cache()
            torch.cuda.synchronize()
        logger.debug("Memory cleaned")
    except Exception as e:
        logger.warning(f"Memory cleanup failed: {e}")


def apply_flux_rules(prompt: str, analysis_metadata: Optional[Dict[str, Any]] = None) -> str:
    """
    Apply Flux optimization rules to a prompt
    
    Args:
        prompt: Raw prompt text
        analysis_metadata: Optional metadata from image analysis including camera suggestions
        
    Returns:
        Optimized prompt following Flux rules
    """
    if not prompt or not isinstance(prompt, str):
        return ""
    
    # Clean the prompt from unwanted elements
    cleaned_prompt = prompt
    for pattern in FLUX_RULES["remove_patterns"]:
        cleaned_prompt = re.sub(pattern, '', cleaned_prompt, flags=re.IGNORECASE)
    
    # Extract description part only (remove CAMERA_SETUP section if present)
    description_part = _extract_description_only(cleaned_prompt)
    
    # Check if BAGEL provided intelligent camera setup
    camera_config = ""
    if analysis_metadata and analysis_metadata.get("has_camera_suggestion") and analysis_metadata.get("camera_setup"):
        # Use BAGEL's intelligent camera suggestion
        bagel_camera = analysis_metadata["camera_setup"]
        camera_config = f", {bagel_camera}" if not bagel_camera.startswith(",") else bagel_camera
        logger.info(f"Using BAGEL camera suggestion: {bagel_camera}")
    else:
        # Fallback to static rules if BAGEL didn't suggest camera
        camera_config = _get_fallback_camera_config(description_part.lower())
        logger.info("Using fallback camera configuration")
    
    # Add lighting enhancements if not present
    lighting_enhancement = _get_lighting_enhancement(description_part.lower())
    
    # Build final prompt: Description + Camera + Lighting
    final_prompt = description_part + camera_config + lighting_enhancement
    
    # Clean up formatting
    final_prompt = _clean_prompt_formatting(final_prompt)
    
    return final_prompt


def _extract_description_only(prompt: str) -> str:
    """Extract only the description part, removing camera setup sections"""
    # Remove CAMERA_SETUP section if present
    if "CAMERA_SETUP:" in prompt:
        parts = prompt.split("CAMERA_SETUP:")
        description = parts[0].strip()
    elif "2. CAMERA_SETUP" in prompt:
        parts = prompt.split("2. CAMERA_SETUP")
        description = parts[0].strip()
    else:
        description = prompt
    
    # Remove "DESCRIPTION:" label if present
    if description.startswith("DESCRIPTION:"):
        description = description.replace("DESCRIPTION:", "").strip()
    elif description.startswith("1. DESCRIPTION:"):
        description = description.replace("1. DESCRIPTION:", "").strip()
    
    return description.strip()


def _get_fallback_camera_config(prompt_lower: str) -> str:
    """Get fallback camera configuration when BAGEL doesn't suggest one"""
    if any(word in prompt_lower for word in ['portrait', 'person', 'man', 'woman', 'face']):
        return FLUX_RULES["camera_configs"]["portrait"]
    elif any(word in prompt_lower for word in ['landscape', 'mountain', 'nature', 'outdoor']):
        return FLUX_RULES["camera_configs"]["landscape"]
    elif any(word in prompt_lower for word in ['street', 'urban', 'city']):
        return FLUX_RULES["camera_configs"]["street"]
    else:
        return FLUX_RULES["camera_configs"]["default"]


def _get_lighting_enhancement(prompt_lower: str) -> str:
    """Determine appropriate lighting enhancement"""
    if 'lighting' not in prompt_lower:
        if 'dramatic' in prompt_lower:
            return FLUX_RULES["lighting_enhancements"]["dramatic"]
        elif 'portrait' in prompt_lower:
            return FLUX_RULES["lighting_enhancements"]["portrait"]
        else:
            return FLUX_RULES["lighting_enhancements"]["default"]
    return ""  # No enhancement needed if lighting already mentioned


def _clean_prompt_formatting(prompt: str) -> str:
    """Clean up prompt formatting"""
    if not prompt:
        return ""
    
    # Ensure it starts with capital letter
    prompt = prompt.strip()
    if prompt:
        prompt = prompt[0].upper() + prompt[1:] if len(prompt) > 1 else prompt.upper()
    
    # Clean up spaces and commas
    prompt = re.sub(r'\s+', ' ', prompt)
    prompt = re.sub(r',\s*,+', ',', prompt)
    prompt = re.sub(r'^\s*,\s*', '', prompt)  # Remove leading commas
    prompt = re.sub(r'\s*,\s*$', '', prompt)  # Remove trailing commas
    
    return prompt.strip()


def calculate_prompt_score(prompt: str, analysis_data: Optional[Dict[str, Any]] = None) -> Tuple[int, Dict[str, int]]:
    """
    Calculate quality score for a prompt
    
    Args:
        prompt: The prompt to score
        analysis_data: Optional analysis data to enhance scoring
        
    Returns:
        Tuple of (total_score, breakdown_dict)
    """
    if not prompt:
        return 0, {"prompt_quality": 0, "technical_details": 0, "artistic_value": 0, "flux_optimization": 0}
    
    breakdown = {}
    
    # Prompt quality score (0-30 points)
    length_score = min(20, len(prompt) // 8)  # Reward decent length
    detail_score = min(10, len(prompt.split(',')) * 2)  # Reward detail
    breakdown["prompt_quality"] = length_score + detail_score
    
    # Technical details score (0-25 points) - Enhanced for BAGEL camera suggestions
    tech_score = 0
    tech_keywords = ['shot on', 'lens', 'photography', 'lighting', 'camera']
    for keyword in tech_keywords:
        if keyword in prompt.lower():
            tech_score += 5
    
    # Bonus points for BAGEL camera suggestions
    if analysis_data and analysis_data.get("has_camera_suggestion"):
        tech_score += 5  # Bonus for intelligent camera selection
        
    breakdown["technical_details"] = min(25, tech_score)
    
    # Artistic value score (0-25 points)
    art_keywords = ['masterful', 'professional', 'cinematic', 'dramatic', 'beautiful']
    art_score = sum(5 for keyword in art_keywords if keyword in prompt.lower())
    breakdown["artistic_value"] = min(25, art_score)
    
    # Flux optimization score (0-20 points)
    flux_score = 0
    
    # Check for camera configuration (either BAGEL or fallback)
    if any(camera in prompt for camera in FLUX_RULES["camera_configs"].values()) or \
       (analysis_data and analysis_data.get("has_camera_suggestion")):
        flux_score += 10
        
    # Check for lighting configuration  
    if any(lighting in prompt for lighting in FLUX_RULES["lighting_enhancements"].values()):
        flux_score += 10
        
    breakdown["flux_optimization"] = flux_score
    
    # Calculate total
    total_score = sum(breakdown.values())
    
    return total_score, breakdown


def get_score_grade(score: int) -> Dict[str, str]:
    """
    Get grade information for a score
    
    Args:
        score: Numeric score
        
    Returns:
        Dictionary with grade and color information
    """
    from config import SCORING_CONFIG
    
    for threshold, grade_info in sorted(SCORING_CONFIG["grade_thresholds"].items(), reverse=True):
        if score >= threshold:
            return grade_info
    
    # Default to lowest grade
    return SCORING_CONFIG["grade_thresholds"][0]


def format_analysis_report(analysis_data: Dict[str, Any], processing_time: float) -> str:
    """
    Format analysis data into a readable report
    
    Args:
        analysis_data: Analysis results
        processing_time: Time taken for processing
        
    Returns:
        Formatted markdown report
    """
    model_used = analysis_data.get("model_used", "Unknown")
    prompt_length = len(analysis_data.get("prompt", ""))
    
    report = f"""**🚀 FLUX OPTIMIZATION COMPLETE**
**Model:** {model_used} • **Time:** {processing_time:.1f}s • **Length:** {prompt_length} chars

**📊 ANALYSIS SUMMARY:**
{analysis_data.get("summary", "Analysis completed successfully")}

**🎯 OPTIMIZATIONS APPLIED:**
✅ Flux camera configuration
✅ Professional lighting setup  
✅ Technical photography details
✅ Artistic enhancement keywords

**⚡ Powered by Pariente AI Research**"""
    
    return report


def safe_execute(func, *args, **kwargs) -> Tuple[bool, Any]:
    """
    Safely execute a function with error handling
    
    Args:
        func: Function to execute
        *args: Function arguments
        **kwargs: Function keyword arguments
        
    Returns:
        Tuple of (success: bool, result: Any)
    """
    try:
        result = func(*args, **kwargs)
        return True, result
    except Exception as e:
        logger.error(f"Safe execution failed for {func.__name__}: {e}")
        return False, str(e)


def truncate_text(text: str, max_length: int = 100) -> str:
    """
    Truncate text to specified length with ellipsis
    
    Args:
        text: Text to truncate
        max_length: Maximum length
        
    Returns:
        Truncated text
    """
    if not text or len(text) <= max_length:
        return text
    
    return text[:max_length-3] + "..."


# Export main functions
__all__ = [
    "setup_logging",
    "optimize_image", 
    "validate_image",
    "clean_memory",
    "apply_flux_rules",
    "calculate_prompt_score",
    "get_score_grade",
    "format_analysis_report",
    "safe_execute",
    "truncate_text"
]