app.py

import gradio as gr
import subprocess
import os 
import shutil
import tempfile
import torch
import logging
import numpy as np
import re
from concurrent.futures import ThreadPoolExecutor
from functools import lru_cache

from datetime import datetime

# 로깅 설정
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(levelname)s - %(message)s',
    handlers=[
        logging.FileHandler('yue_generation.log'),
        logging.StreamHandler()
    ]
)

def optimize_gpu_settings():
    if torch.cuda.is_available():
        # GPU 메모리 관리 최적화
        torch.backends.cuda.matmul.allow_tf32 = True
        torch.backends.cudnn.benchmark = True
        torch.backends.cudnn.enabled = True
        torch.backends.cudnn.deterministic = False
        
        # L40S에 최적화된 메모리 설정
        torch.cuda.empty_cache()
        torch.cuda.set_device(0)
        
        # CUDA 스트림 최적화
        torch.cuda.Stream(0)
        
        # 메모리 할당 최적화
        os.environ['PYTORCH_CUDA_ALLOC_CONF'] = 'max_split_size_mb:512'
        
        logging.info(f"Using GPU: {torch.cuda.get_device_name(0)}")
        logging.info(f"Available GPU memory: {torch.cuda.get_device_properties(0).total_memory / 1024**3:.2f} GB")
        
        # L40S 특화 설정
        if 'L40S' in torch.cuda.get_device_name(0):
            torch.cuda.set_per_process_memory_fraction(0.95)

def analyze_lyrics(lyrics, repeat_chorus=2):
    lines = [line.strip() for line in lyrics.split('\n') if line.strip()]
    
    sections = {
        'verse': 0,
        'chorus': 0,
        'bridge': 0,
        'total_lines': len(lines)
    }
    
    current_section = None
    section_lines = {
        'verse': [],
        'chorus': [],
        'bridge': []
    }
    last_section = None

    # 마지막 섹션 태그 찾기
    for i, line in enumerate(lines):
        if '[verse]' in line.lower() or '[chorus]' in line.lower() or '[bridge]' in line.lower():
            last_section = i

    for i, line in enumerate(lines):
        lower_line = line.lower()
        
        # 섹션 태그 처리
        if '[verse]' in lower_line:
            if current_section:  # 이전 섹션의 라인들 저장
                section_lines[current_section].extend(lines[last_section_start:i])
            current_section = 'verse'
            sections['verse'] += 1
            last_section_start = i + 1
            continue
        elif '[chorus]' in lower_line:
            if current_section:
                section_lines[current_section].extend(lines[last_section_start:i])
            current_section = 'chorus'
            sections['chorus'] += 1
            last_section_start = i + 1
            continue
        elif '[bridge]' in lower_line:
            if current_section:
                section_lines[current_section].extend(lines[last_section_start:i])
            current_section = 'bridge'
            sections['bridge'] += 1
            last_section_start = i + 1
            continue

    # 마지막 섹션의 라인들 추가
    if current_section and last_section_start < len(lines):
        section_lines[current_section].extend(lines[last_section_start:])

    # 코러스 반복 처리
    if sections['chorus'] > 0 and repeat_chorus > 1:
        original_chorus = section_lines['chorus'][:]
        for _ in range(repeat_chorus - 1):
            section_lines['chorus'].extend(original_chorus)

    # 섹션별 라인 수 확인 로깅
    logging.info(f"Section line counts - Verse: {len(section_lines['verse'])}, "
                f"Chorus: {len(section_lines['chorus'])}, "
                f"Bridge: {len(section_lines['bridge'])}")

    return sections, (sections['verse'] + sections['chorus'] + sections['bridge']), len(lines), section_lines

def calculate_generation_params(lyrics):
    sections, total_sections, total_lines, section_lines = analyze_lyrics(lyrics)
    
    # 기본 시간 계산 (초 단위)
    time_per_line = {
        'verse': 4,    # verse는 한 줄당 4초
        'chorus': 6,   # chorus는 한 줄당 6초
        'bridge': 5    # bridge는 한 줄당 5초
    }
    
    # 각 섹션별 예상 시간 계산 (마지막 섹션 포함)
    section_durations = {}
    for section_type in ['verse', 'chorus', 'bridge']:
        lines_count = len(section_lines[section_type])
        section_durations[section_type] = lines_count * time_per_line[section_type]
    
    # 전체 시간 계산 (여유 시간 추가)
    total_duration = sum(duration for duration in section_durations.values())
    total_duration = max(60, int(total_duration * 1.2))  # 20% 여유 시간 추가
    
    # 토큰 계산 (마지막 섹션을 위한 추가 토큰)
    base_tokens = 3000
    tokens_per_line = 200
    extra_tokens = 1000  # 마지막 섹션을 위한 추가 토큰
    
    total_tokens = base_tokens + (total_lines * tokens_per_line) + extra_tokens
    
    # 세그먼트 수 계산 (마지막 섹션을 위한 추가 세그먼트)
    if sections['chorus'] > 0:
        num_segments = 4  # 코러스가 있는 경우 4개 세그먼트
    else:
        num_segments = 3  # 코러스가 없는 경우 3개 세그먼트
    
    # 토큰 수 제한 (더 큰 제한)
    max_tokens = min(12000, total_tokens)  # 최대 토큰 수 증가
    
    return {
        'max_tokens': max_tokens,
        'num_segments': num_segments,
        'sections': sections,
        'section_lines': section_lines,
        'estimated_duration': total_duration,
        'section_durations': section_durations,
        'has_chorus': sections['chorus'] > 0
    }

def detect_and_select_model(text):
    if re.search(r'[\u3131-\u318E\uAC00-\uD7A3]', text):
        return "m-a-p/YuE-s1-7B-anneal-jp-kr-cot"
    elif re.search(r'[\u4e00-\u9fff]', text):
        return "m-a-p/YuE-s1-7B-anneal-zh-cot"
    elif re.search(r'[\u3040-\u309F\u30A0-\u30FF]', text):
        return "m-a-p/YuE-s1-7B-anneal-jp-kr-cot"
    else:
        return "m-a-p/YuE-s1-7B-anneal-en-cot"

def install_flash_attn():
    try:
        if not torch.cuda.is_available():
            logging.warning("GPU not available, skipping flash-attn installation")
            return False
            
        cuda_version = torch.version.cuda
        if cuda_version is None:
            logging.warning("CUDA not available, skipping flash-attn installation")
            return False
            
        logging.info(f"Detected CUDA version: {cuda_version}")
        
        try:
            import flash_attn
            logging.info("flash-attn already installed")
            return True
        except ImportError:
            logging.info("Installing flash-attn...")
            
        subprocess.run(
            ["pip", "install", "flash-attn", "--no-build-isolation"],
            check=True,
            capture_output=True
        )
        logging.info("flash-attn installed successfully!")
        return True
            
    except Exception as e:
        logging.warning(f"Failed to install flash-attn: {e}")
        return False


def download_missing_files():
    try:
        from huggingface_hub import hf_hub_download, snapshot_download
        
        # xcodec_mini_infer 파일들 직접 다운로드
        repo_id = "hf-internal-testing/xcodec_mini_infer"  # 저장소 경로 수정
        files_to_download = {
            "config.json": "config/config.json",
            "vocal_decoder.pth": "checkpoints/vocal_decoder.pth",
            "inst_decoder.pth": "checkpoints/inst_decoder.pth"
        }
        
        xcodec_dir = "./xcodec_mini_infer"
        os.makedirs(xcodec_dir, exist_ok=True)
        os.makedirs(os.path.join(xcodec_dir, "checkpoints"), exist_ok=True)
        
        for target_name, source_path in files_to_download.items():
            try:
                downloaded_path = hf_hub_download(
                    repo_id=repo_id,
                    filename=source_path,
                    cache_dir="./models/cache",
                    force_download=True,
                    local_files_only=False
                )
                logging.info(f"Downloaded {source_path} to: {downloaded_path}")
                
                # 파일을 올바른 위치로 복사
                target_path = os.path.join(xcodec_dir, target_name)
                shutil.copy2(downloaded_path, target_path)
                logging.info(f"Copied to: {target_path}")
                
            except Exception as e:
                logging.error(f"Error downloading {source_path}: {e}")
                # 대체 저장소 시도
                try:
                    alt_repo_id = "facebook/musicgen-small"
                    downloaded_path = hf_hub_download(
                        repo_id=alt_repo_id,
                        filename=source_path,
                        cache_dir="./models/cache",
                        force_download=True
                    )
                    target_path = os.path.join(xcodec_dir, target_name)
                    shutil.copy2(downloaded_path, target_path)
                    logging.info(f"Downloaded from alternate source to: {target_path}")
                except Exception as alt_e:
                    logging.error(f"Error with alternate download: {alt_e}")
                    raise
        
        # YuE 모델들 다운로드
        models = [
            "m-a-p/YuE-s1-7B-anneal-jp-kr-cot",
            "m-a-p/YuE-s1-7B-anneal-en-cot",
            "m-a-p/YuE-s1-7B-anneal-zh-cot",
            "m-a-p/YuE-s2-1B-general"
        ]
        
        for model in models:
            model_name = model.split('/')[-1]
            model_path = snapshot_download(
                repo_id=model,
                local_dir=f"./models/{model_name}",
                cache_dir="./models/cache",
                resume_download=True,
                force_download=True
            )
            logging.info(f"Downloaded {model_name} to: {model_path}")
        
        # 파일 존재 및 크기 확인
        for target_name in files_to_download.keys():
            file_path = os.path.join(xcodec_dir, target_name)
            if not os.path.exists(file_path):
                raise FileNotFoundError(f"Failed to download {target_name}")
            file_size = os.path.getsize(file_path)
            if file_size == 0:
                raise FileNotFoundError(f"Downloaded file is empty: {target_name}")
            logging.info(f"Verified {target_name}: {file_size} bytes")
            
        logging.info("All required models downloaded successfully")
        
    except Exception as e:
        logging.error(f"Error downloading models: {e}")
        raise

def check_model_files():
    base_dir = os.getcwd()
    xcodec_dir = os.path.join(base_dir, "xcodec_mini_infer")
    
    # 필요한 파일 목록
    required_files = {
        "config.json": "config.json",
        "vocal_decoder.pth": "vocal_decoder.pth",
        "inst_decoder.pth": "inst_decoder.pth"
    }
    
    # 파일 존재 여부 확인
    missing = False
    for file_name in required_files.keys():
        file_path = os.path.join(xcodec_dir, file_name)
        if not os.path.exists(file_path):
            missing = True
            logging.warning(f"Missing file: {file_path}")
    
    if missing:
        logging.info("Downloading missing files...")
        download_missing_files()
        
        # 다운로드 후 파일 재확인
        for file_name in required_files.keys():
            file_path = os.path.join(xcodec_dir, file_name)
            if not os.path.exists(file_path):
                raise FileNotFoundError(f"Failed to download or locate required file: {file_name}")
            else:
                file_size = os.path.getsize(file_path)
                if file_size == 0:
                    raise FileNotFoundError(f"Downloaded file is empty: {file_name}")
                logging.info(f"Verified {file_name}: {file_size} bytes")

def initialize_system():
    optimize_gpu_settings()
    
    try:
        # 기본 디렉토리 구조 생성
        base_dir = os.path.abspath("./inference")
        os.makedirs(base_dir, exist_ok=True)
        os.makedirs(os.path.join(base_dir, "models"), exist_ok=True)
        
        # 작업 디렉토리 변경
        os.chdir(base_dir)
        logging.info(f"Working directory changed to: {os.getcwd()}")
        
        from huggingface_hub import snapshot_download, hf_hub_download
        
        # xcodec_mini_infer 파일들 직접 다운로드
        xcodec_dir = os.path.join(base_dir, "xcodec_mini_infer")
        os.makedirs(xcodec_dir, exist_ok=True)
        
        # 필수 파일 직접 다운로드
        required_files = {
            "config.json": "config.json",
            "vocal_decoder.pth": "vocal_decoder.pth",
            "inst_decoder.pth": "inst_decoder.pth"
        }
        
        for file_name in required_files.keys():
            try:
                file_path = os.path.join(xcodec_dir, file_name)
                if not os.path.exists(file_path):
                    downloaded_path = hf_hub_download(
                        repo_id="m-a-p/xcodec_mini_infer",
                        filename=file_name,
                        local_dir=xcodec_dir,
                        force_download=True
                    )
                    if downloaded_path != file_path:
                        shutil.copy2(downloaded_path, file_path)
                    logging.info(f"Downloaded {file_name} to {file_path}")
            except Exception as e:
                logging.error(f"Error downloading {file_name}: {e}")
                raise
        
        # YuE 모델들 다운로드
        models = [
            "m-a-p/YuE-s1-7B-anneal-jp-kr-cot",
            "m-a-p/YuE-s1-7B-anneal-en-cot",
            "m-a-p/YuE-s1-7B-anneal-zh-cot",
            "m-a-p/YuE-s2-1B-general"
        ]
        
        with ThreadPoolExecutor(max_workers=4) as executor:
            futures = []
            
            # Flash Attention 설치
            futures.append(executor.submit(install_flash_attn))
            
            # 모델 다운로드
            for model in models:
                model_name = model.split('/')[-1]
                model_path = os.path.join(base_dir, "models", model_name)
                futures.append(executor.submit(
                    snapshot_download,
                    repo_id=model,
                    local_dir=model_path,
                    force_download=True
                ))
            
            # 모든 작업 완료 대기
            for future in futures:
                future.result()
        
        # 파일 존재 확인
        for file_name, _ in required_files.items():
            file_path = os.path.join(xcodec_dir, file_name)
            if not os.path.exists(file_path):
                raise FileNotFoundError(f"Required file still missing after download: {file_path}")
            else:
                file_size = os.path.getsize(file_path)
                logging.info(f"Verified {file_name}: {file_size} bytes")
        
        logging.info("System initialization completed successfully")
        
    except Exception as e:
        logging.error(f"Directory error: {e}")
        raise

@lru_cache(maxsize=100)
def get_cached_file_path(content_hash, prefix):
    return create_temp_file(content_hash, prefix)

def empty_output_folder(output_dir):
    try:
        shutil.rmtree(output_dir)
        os.makedirs(output_dir)
        logging.info(f"Output folder cleaned: {output_dir}")
    except Exception as e:
        logging.error(f"Error cleaning output folder: {e}")
        raise

def create_temp_file(content, prefix, suffix=".txt"):
    temp_file = tempfile.NamedTemporaryFile(delete=False, mode="w", prefix=prefix, suffix=suffix)
    content = content.strip() + "\n\n"
    content = content.replace("\r\n", "\n").replace("\r", "\n")
    temp_file.write(content)
    temp_file.close()
    logging.debug(f"Temporary file created: {temp_file.name}")
    return temp_file.name

def get_last_mp3_file(output_dir):
    mp3_files = [f for f in os.listdir(output_dir) if f.endswith('.mp3')]
    if not mp3_files:
        logging.warning("No MP3 files found")
        return None
    
    mp3_files_with_path = [os.path.join(output_dir, f) for f in mp3_files]
    mp3_files_with_path.sort(key=os.path.getmtime, reverse=True)
    return mp3_files_with_path[0]

def get_audio_duration(file_path):
    try:
        import librosa
        duration = librosa.get_duration(path=file_path)
        return duration
    except Exception as e:
        logging.error(f"Failed to get audio duration: {e}")
        return None



def infer(genre_txt_content, lyrics_txt_content, num_segments, max_new_tokens):
    check_model_files()  # 필요한 파일 체크 및 다운로드
    
    genre_txt_path = None
    lyrics_txt_path = None
    
    try:

        model_path, config, params = optimize_model_selection(lyrics_txt_content, genre_txt_content)
        logging.info(f"Selected model: {model_path}")
        logging.info(f"Lyrics analysis: {params}")
        
        has_chorus = params['sections']['chorus'] > 0
        estimated_duration = params.get('estimated_duration', 90)


        # 세그먼트 및 토큰 수 설정
        if has_chorus:
            actual_max_tokens = min(12000, int(config['max_tokens'] * 1.3))  # 30% 더 많은 토큰
            actual_num_segments = min(5, params['num_segments'] + 2)  # 추가 세그먼트
        else:
            actual_max_tokens = min(10000, int(config['max_tokens'] * 1.2))
            actual_num_segments = min(4, params['num_segments'] + 1)
        


        logging.info(f"Estimated duration: {estimated_duration} seconds")
        logging.info(f"Has chorus sections: {has_chorus}")
        logging.info(f"Using segments: {actual_num_segments}, tokens: {actual_max_tokens}")
        
        genre_txt_path = create_temp_file(genre_txt_content, prefix="genre_")
        lyrics_txt_path = create_temp_file(lyrics_txt_content, prefix="lyrics_")
        
        output_dir = "./output"
        os.makedirs(output_dir, exist_ok=True)
        empty_output_folder(output_dir)

        command = [
            "python", "infer.py",
            "--stage1_model", model_path,  # 원래 모델 경로 사용
            "--stage2_model", "m-a-p/YuE-s2-1B-general",
            "--genre_txt", genre_txt_path,
            "--lyrics_txt", lyrics_txt_path,
            "--run_n_segments", str(actual_num_segments),
            "--stage2_batch_size", "16",
            "--output_dir", output_dir,
            "--cuda_idx", "0",
            "--max_new_tokens", str(actual_max_tokens),
            "--disable_offload_model"
        ]


        env = os.environ.copy()
        if torch.cuda.is_available():
            env.update({
                "CUDA_VISIBLE_DEVICES": "0",
                "CUDA_HOME": "/usr/local/cuda",
                "PATH": f"/usr/local/cuda/bin:{env.get('PATH', '')}",
                "LD_LIBRARY_PATH": f"/usr/local/cuda/lib64:{env.get('LD_LIBRARY_PATH', '')}",
                "PYTORCH_CUDA_ALLOC_CONF": "max_split_size_mb:512",
                "CUDA_LAUNCH_BLOCKING": "0",
                "TRANSFORMERS_CACHE": "./models/cache",
                "HF_HOME": "./models/cache"
            })

            


        # transformers 캐시 마이그레이션 처리
        try:
            from transformers.utils import move_cache
            move_cache()
        except Exception as e:
            logging.warning(f"Cache migration warning (non-critical): {e}")

        process = subprocess.run(
            command,
            env=env,
            check=False,
            capture_output=True,
            text=True
        )

        logging.info(f"Command output: {process.stdout}")
        if process.stderr:
            logging.error(f"Command error: {process.stderr}")

        if process.returncode != 0:
            logging.error(f"Command failed with return code: {process.returncode}")
            logging.error(f"Command: {' '.join(command)}")
            raise RuntimeError(f"Inference failed: {process.stderr}")

        last_mp3 = get_last_mp3_file(output_dir)
        if last_mp3:
            try:
                duration = get_audio_duration(last_mp3)
                logging.info(f"Generated audio file: {last_mp3}")
                if duration:
                    logging.info(f"Audio duration: {duration:.2f} seconds")
                    logging.info(f"Expected duration: {estimated_duration} seconds")
                    
                    if duration < estimated_duration * 0.8:
                        logging.warning(f"Generated audio is shorter than expected: {duration:.2f}s < {estimated_duration:.2f}s")
            except Exception as e:
                logging.warning(f"Failed to get audio duration: {e}")
            return last_mp3
        else:
            logging.warning("No output audio file generated")
            return None

    except Exception as e:
        logging.error(f"Inference error: {e}")
        raise
    finally:
        for path in [genre_txt_path, lyrics_txt_path]:
            if path and os.path.exists(path):
                try:
                    os.remove(path)
                    logging.debug(f"Removed temporary file: {path}")
                except Exception as e:
                    logging.warning(f"Failed to remove temporary file {path}: {e}")

def optimize_model_selection(lyrics, genre):
    model_path = detect_and_select_model(lyrics)
    params = calculate_generation_params(lyrics)
    
    has_chorus = params['sections']['chorus'] > 0
    tokens_per_segment = params['max_tokens'] // params['num_segments']
    
    model_config = {
        "m-a-p/YuE-s1-7B-anneal-en-cot": {
            "max_tokens": params['max_tokens'],
            "temperature": 0.8,
            "batch_size": 16,
            "num_segments": params['num_segments'],
            "estimated_duration": params['estimated_duration']
        },
        "m-a-p/YuE-s1-7B-anneal-jp-kr-cot": {
            "max_tokens": params['max_tokens'],
            "temperature": 0.7,
            "batch_size": 16,
            "num_segments": params['num_segments'],
            "estimated_duration": params['estimated_duration']
        },
        "m-a-p/YuE-s1-7B-anneal-zh-cot": {
            "max_tokens": params['max_tokens'],
            "temperature": 0.7,
            "batch_size": 16,
            "num_segments": params['num_segments'],
            "estimated_duration": params['estimated_duration']
        }
    }
    
    if has_chorus:
        for config in model_config.values():
            config['max_tokens'] = int(config['max_tokens'] * 1.5)
    
    return model_path, model_config[model_path], params

css = """
#main-container {
    max-width: 1200px;
    margin: auto;
    padding: 20px;
}
#header {
    text-align: center;
    margin-bottom: 30px;
}
#genre-input, #lyrics-input {
    border-radius: 8px;
}
#generate-btn {
    margin-top: 20px;
    min-height: 45px;
}
.label {
    font-weight: bold;
}
.example-container {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin: 10px 0;
}
"""

def main():
    with gr.Blocks(theme=gr.themes.Soft(
        primary_hue="indigo",
        secondary_hue="purple",
        neutral_hue="slate",
        font=["Arial", "sans-serif"]
    ), css=css) as demo:
        with gr.Column(elem_id="main-container"):
            # 헤더 섹션
            with gr.Row(elem_id="header"):
                gr.Markdown(
                    """
                    # 🎵 Open SUNO: Transform Your Lyrics into Complete Songs
                    ### Create complete songs from your lyrics in multiple languages
                    """,
                    elem_id="title"
                )

            # 메인 컨텐츠를 탭으로 구성
            with gr.Tabs() as tabs:
                # 생성 탭
                with gr.TabItem("✨ Create Music", id="create"):
                    with gr.Row():
                        # 입력 섹션
                        with gr.Column(scale=1):
                            genre_txt = gr.Textbox(
                                label="🎸 Music Genre & Style",
                                placeholder="e.g., K-pop bright energetic synth dance electronic...",
                                elem_id="genre-input"
                            )
                            lyrics_txt = gr.Textbox(
                                label="📝 Lyrics",
                                placeholder="Enter lyrics with section tags: [verse], [chorus], [bridge]...",
                                lines=10,
                                elem_id="lyrics-input"
                            )
                            
                            # 정보 표시 섹션
                            with gr.Row():
                                with gr.Column(scale=1):
                                    duration_info = gr.Label(
                                        label="⏱️ Estimated Duration",
                                        elem_id="duration-info"
                                    )
                                with gr.Column(scale=1):
                                    sections_info = gr.Label(
                                        label="📊 Section Analysis",
                                        elem_id="sections-info"
                                    )
                            
                            # 생성 버튼
                            submit_btn = gr.Button(
                                "🎼 Generate Music",
                                variant="primary",
                                elem_id="generate-btn"
                            )

                        # 출력 섹션
                        with gr.Column(scale=1):
                            music_out = gr.Audio(
                                label="🎵 Generated Music",
                                elem_id="music-output"
                            )
                            
                            # 진행 상태 표시
                            progress = gr.Textbox(
                                label="Generation Status",
                                interactive=False,
                                elem_id="progress-status"
                            )

                # 히스토리 탭
                with gr.TabItem("📚 History", id="history"):
                    with gr.Row():
                        history_container = gr.HTML("""
                            <div id="history-container" style="width: 100%; padding: 10px;">
                                <h3>🎵 Generation History</h3>
                                <div id="history-list"></div>
                            </div>
                        """)
                    
                    # 히스토리 상태 저장
                    history_state = gr.State([])

            # 예제 섹션
            with gr.Accordion("📖 Examples", open=False):
                gr.Examples(
                    examples=[
                        [
                            "female blues airy vocal bright vocal piano sad romantic guitar jazz",
                            """[verse]
In the quiet of the evening, shadows start to fall
Whispers of the night wind echo through the hall
Lost within the silence, I hear your gentle voice
Guiding me back homeward, making my heart rejoice

[chorus]
Don't let this moment fade, hold me close tonight
"""
                        ],
                        [
                            "K-pop bright energetic synth dance electronic",
                            """[verse]
언젠가 마주한 눈빛 속에서
어두운 밤을 지날 때마다

[chorus]
다시 한 번 내게 말해줘
"""
                        ]
                    ],
                    inputs=[genre_txt, lyrics_txt]
                )

            # 도움말 및 설명 섹션
            with gr.Accordion("ℹ️ Help & Information", open=False):
                gr.Markdown(
                    """
                    ### 🎵 How to Use
                    1. **Enter Genre & Style**: Describe the musical style you want (e.g., "K-pop", "Jazz", "Rock")
                    2. **Input Lyrics**: Write your lyrics using section tags:
                        - Use `[verse]` for verses
                        - Use `[chorus]` for choruses
                        - Use `[bridge]` for bridges
                    3. **Generate**: Click the Generate button and wait for your music!

                    ### 🌏 Supported Languages
                    - English
                    - Korean (한국어)
                    - Japanese (日本語)
                    - Chinese (中文)

                    ### ⚡ Tips
                    - Be specific with your genre descriptions
                    - Include emotion and instrument preferences
                    - Make sure to properly tag your lyrics sections
                    - For best results, include both verse and chorus sections
                    """
                )

        # 숨겨진 상태 변수들
        num_segments = gr.State(value=2)  # 기본값 2
        max_new_tokens = gr.State(value=4000)  # 기본값 4000

        # 시스템 초기화
        initialize_system()

        def update_info(lyrics):
            if not lyrics:
                return "No lyrics entered", "No sections detected"
            params = calculate_generation_params(lyrics)
            duration = params['estimated_duration']
            sections = params['sections']
            return (
                f"⏱️ Estimated: {duration:.1f} seconds",
                f"📊 Verses: {sections['verse']}, Chorus: {sections['chorus']}"
            )



        def update_history(audio_path, genre, lyrics, history):
            if audio_path:
                new_entry = {
                    "audio": audio_path,
                    "genre": genre,
                    "lyrics": lyrics,
                    "timestamp": datetime.now().strftime("%Y-%m-%d %H:%M:%S")  # datetime 직접 사용
                }
                history = [new_entry] + (history or [])
        
                history_html = "<div class='history-entries'>"
                for entry in history:
                    history_html += f"""
                        <div class='history-entry' style='margin: 10px 0; padding: 10px; border: 1px solid #ddd; border-radius: 8px;'>
                            <audio controls src='{entry["audio"]}'></audio>
                            <div style='margin-top: 5px;'><strong>Genre:</strong> {entry["genre"]}</div>
                            <div style='margin-top: 5px;'><strong>Lyrics:</strong><pre>{entry["lyrics"]}</pre></div>
                            <div style='color: #666; font-size: 0.9em;'>{entry["timestamp"]}</div>
                        </div>
                    """
                history_html += "</div>"
        
                return history, history_html
            return history, ""

        def generate_with_progress(genre, lyrics, segments, tokens, history):
            try:
                status_text = "🎵 Starting generation..."
                result = infer(genre, lyrics, segments, tokens)
            
                if result:
                    status_text = "✅ Generation complete!"
                    new_history, history_html = update_history(result, genre, lyrics, history)
                    return result, new_history, history_html, status_text
                else:
                    status_text = "❌ Generation failed"
                    return None, history, "", status_text
            except Exception as e:
                status_text = f"❌ Error: {str(e)}"
                return None, history, "", status_text
# 이벤트 핸들러
        lyrics_txt.change(
            fn=update_info,
            inputs=[lyrics_txt],
            outputs=[duration_info, sections_info]
        )
        
        # submit 버튼 클릭 이벤트 추가
        submit_btn.click(
            fn=generate_with_progress,
            inputs=[genre_txt, lyrics_txt, num_segments, max_new_tokens, history_state],
            outputs=[music_out, history_state, history_container, progress]
        )

        return demo


if __name__ == "__main__":
    demo = main()
    demo.queue(max_size=20).launch(
        server_name="0.0.0.0",
        server_port=7860,
        share=True,
        show_api=True,
        show_error=True,
        max_threads=8
    )