"""
Video Flow v2.0 - 命令行主流程控制器

独立的 CLI 入口，支持命令行参数调用完整的视频生成流程。
与 app.py (Streamlit UI) 分离，共用 modules 层。

Usage:
    python main_flow.py --help
    
    python main_flow.py \
        --product-name "网红气质大号发量多!高马尾香蕉夹" \
        --images /path/to/主图1.png /path/to/主图2.png \
        --category "钟表配饰-时尚饰品-发饰" \
        --price "3.99元" \
        --tags "回头客|款式好看|材质好" \
        --model doubao \
        --output final_hairclip
"""
import argparse
import logging
import sys
import json
import time
import random
from pathlib import Path
from typing import Dict, List, Optional

# 设置日志
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    handlers=[
        logging.StreamHandler(sys.stdout),
        logging.FileHandler("video_flow.log")
    ]
)

import config
from modules.script_gen import ScriptGenerator
from modules.image_gen import ImageGenerator
from modules.video_gen import VideoGenerator
from modules.composer import VideoComposer

logger = logging.getLogger("MainFlow")


def parse_args():
    """解析命令行参数"""
    parser = argparse.ArgumentParser(
        description="Video Flow CLI - 商品短视频自动生成命令行工具",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
示例:
  # 使用默认测试数据
  python main_flow.py --demo
  
  # 指定商品信息
  python main_flow.py \\
    --product-name "网红气质大号发量多!高马尾香蕉夹" \\
    --images ./素材/发夹/原始稿/主图1.png ./素材/发夹/原始稿/主图2.png \\
    --category "钟表配饰-时尚饰品-发饰" \\
    --price "3.99元" \\
    --tags "回头客|款式好看|材质好" \\
    --model doubao \\
    --output final_hairclip
        """
    )
    
    # 基本参数
    parser.add_argument("--demo", action="store_true", help="使用内置测试数据（发夹案例）")
    parser.add_argument("--product-name", type=str, help="商品标题")
    parser.add_argument("--images", nargs="+", type=str, help="商品主图路径列表 (建议 3-5 张)")
    
    # 商品信息
    parser.add_argument("--category", type=str, default="", help="商品类目")
    parser.add_argument("--price", type=str, default="", help="商品价格")
    parser.add_argument("--tags", type=str, default="", help="评价标签 (用于提炼卖点)")
    parser.add_argument("--params", type=str, default="", help="商品参数")
    parser.add_argument("--style-hint", type=str, default="", help="风格提示 (如: 韩风、高级感)")
    
    # 模型选择
    parser.add_argument("--script-model", choices=["shubiaobiao", "doubao"], default="doubao",
                        help="脚本生成模型 (default: doubao)")
    parser.add_argument("--image-model", choices=["shubiaobiao", "doubao", "gemini", "doubao-group"], 
                        default="doubao", help="图片生成模型 (default: doubao)")
    
    # 输出选项
    parser.add_argument("--output", type=str, default="final_video", help="输出文件名 (不含扩展名)")
    parser.add_argument("--project-id", type=str, default=None, help="项目ID (默认自动生成)")
    
    # 可选步骤控制
    parser.add_argument("--skip-video", action="store_true", help="跳过视频生成步骤 (仅生成脚本和图片)")
    parser.add_argument("--skip-compose", action="store_true", help="跳过合成步骤")
    
    return parser.parse_args()


def get_demo_data() -> tuple:
    """获取内置测试数据 (发夹案例)"""
    product_name = "网红气质大号发量多!高马尾香蕉夹 马尾显发量蓬松神器马尾夹"
    product_info = {
        "category": "钟表配饰-时尚饰品-发饰",
        "price": "3.99元",
        "tags": "回头客|款式好看|材质好|尺寸合适|颜色好看|很好用|做工好|质感不错|很牢固",
        "params": "金属材质:非金属; 非金属材质:树脂; 发夹分类:香蕉夹; 风格:日韩|简约风|法式|瑞丽风",
        "style_hint": ""
    }
    
    # 原始图片路径
    base_image_dir = config.BASE_DIR / "素材" / "发夹" / "原始稿"
    original_images = [
        str(base_image_dir / "主图1.png"),
        str(base_image_dir / "主图2.png"),
        str(base_image_dir / "主图3.png")
    ]
    
    return product_name, product_info, original_images


def match_bgm_by_style(bgm_style: str, bgm_dir: Path) -> Optional[str]:
    """
    根据脚本 bgm_style 智能匹配 BGM 文件
    - 匹配成功：随机选一个匹配的 BGM
    - 匹配失败：随机选任意一个 BGM
    """
    # 获取所有 BGM 文件 (支持 .mp3 和 .mp4)
    bgm_files = list(bgm_dir.glob("*.[mM][pP][34]")) + list(bgm_dir.glob("*.[mM][pP]3"))
    bgm_files = [f for f in bgm_files if f.is_file() and not f.name.startswith('.')]
    
    if not bgm_files:
        return None
    
    # 关键词匹配
    if bgm_style:
        style_lower = bgm_style.lower()
        keywords = ["活泼", "欢快", "轻松", "舒缓", "休闲", "温柔", "随性", "百搭", "bling", "节奏"]
        matched_keywords = [kw for kw in keywords if kw in style_lower]
        
        matched_files = []
        for f in bgm_files:
            fname = f.name
            if any(kw in fname for kw in matched_keywords):
                matched_files.append(f)
        
        if matched_files:
            return str(random.choice(matched_files))
    
    # 无匹配则随机选一个
    return str(random.choice(bgm_files))


def run_video_flow(args) -> Optional[str]:
    """执行完整的视频生成流程"""
    
    # ===== 1. 准备输入数据 =====
    if args.demo:
        logger.info("Using DEMO data (发夹案例)...")
        product_name, product_info, original_images = get_demo_data()
    else:
        if not args.product_name or not args.images:
            logger.error("Must provide --product-name and --images, or use --demo")
            return None
            
        product_name = args.product_name
        product_info = {
            "category": args.category,
            "price": args.price,
            "tags": args.tags,
            "params": args.params,
            "style_hint": args.style_hint
        }
        original_images = args.images
    
    # 验证图片是否存在
    valid_images = [p for p in original_images if Path(p).exists()]
    if not valid_images:
        logger.error("No valid input images found!")
        logger.error(f"Checked paths: {original_images}")
        return None
    
    logger.info(f"Found {len(valid_images)} valid images")
    
    # 生成项目 ID
    project_id = args.project_id or f"CLI-{int(time.time())}"
    logger.info(f"Project ID: {project_id}")
    
    # ===== 2. 生成脚本 =====
    logger.info("="*50)
    logger.info("Step 1: Generating Script...")
    logger.info("="*50)
    
    script_gen = ScriptGenerator()
    script = script_gen.generate_script(
        product_name, 
        product_info, 
        valid_images, 
        model_provider=args.script_model
    )
    
    if not script:
        logger.error("Script generation failed.")
        return None

    # 保存脚本供检查
    script_path = config.OUTPUT_DIR / f"script_{project_id}.json"
    with open(script_path, "w", encoding="utf-8") as f:
        json.dump(script, f, ensure_ascii=False, indent=2)
    logger.info(f"Script saved to {script_path}")
    
    scenes = script.get("scenes", [])
    logger.info(f"Generated {len(scenes)} scenes")
    
    # ===== 3. 生成分镜图片 =====
    logger.info("="*50)
    logger.info("Step 2: Generating Scene Images...")
    logger.info("="*50)
    
    image_gen = ImageGenerator()
    visual_anchor = script.get("visual_anchor", "")
    
    scene_images: Dict[int, str] = {}
    
    if args.image_model == "doubao-group":
        # 组图生成模式
        logger.info("Using Doubao Group Image Generation...")
        scene_images = image_gen.generate_group_images_doubao(
            scenes=scenes,
            reference_images=valid_images,
            visual_anchor=visual_anchor
        )
    else:
        # 顺序生成模式
        current_refs = list(valid_images)
        
        for idx, scene in enumerate(scenes):
            scene_id = scene["id"]
            logger.info(f"Generating image for Scene {scene_id} ({idx+1}/{len(scenes)})...")
            
            img_path = image_gen.generate_single_scene_image(
                scene=scene,
                original_image_path=current_refs,
                previous_image_path=None,
                model_provider=args.image_model,
                visual_anchor=visual_anchor
            )
            
            if img_path:
                scene_images[scene_id] = img_path
                current_refs.append(img_path)
                logger.info(f"Scene {scene_id} image: {img_path}")
            else:
                logger.warning(f"Failed to generate image for Scene {scene_id}")
    
    if not scene_images:
        logger.error("Image generation failed (no images generated).")
        return None
        
    logger.info(f"Generated {len(scene_images)} scene images.")
    
    if args.skip_video:
        logger.info("Skipping video generation (--skip-video)")
        return None
    
    # ===== 4. 生成分镜视频 =====
    logger.info("="*50)
    logger.info("Step 3: Generating Scene Videos...")
    logger.info("="*50)
    
    video_gen = VideoGenerator()
    scene_videos = video_gen.generate_scene_videos(project_id, script, scene_images)
    
    if not scene_videos:
        logger.error("Video generation failed (or partially failed).")
        return None
    
    logger.info(f"Generated {len(scene_videos)} scene videos.")
    
    if args.skip_compose:
        logger.info("Skipping composition (--skip-compose)")
        return None
    
    # ===== 5. 合成最终视频 =====
    logger.info("="*50)
    logger.info("Step 4: Composing Final Video...")
    logger.info("="*50)
    
    composer = VideoComposer(voice_type=config.VOLC_TTS_DEFAULT_VOICE)
    
    # 智能匹配 BGM
    bgm_style = script.get("bgm_style", "")
    bgm_path = match_bgm_by_style(bgm_style, config.ASSETS_DIR / "bgm")
    if bgm_path:
        logger.info(f"Selected BGM: {Path(bgm_path).name} (style: {bgm_style or 'default'})")
    
    # 合成
    output_name = f"{args.output}_{project_id}"
    final_video = composer.compose_from_script(
        script=script,
        video_map=scene_videos,
        bgm_path=bgm_path,
        output_name=output_name
    )
    
    logger.info("="*50)
    logger.info(f"✅ Workflow Complete!")
    logger.info(f"   Final Video: {final_video}")
    logger.info(f"   Script: {script_path}")
    logger.info("="*50)
    
    return final_video


def main():
    """CLI 入口"""
    args = parse_args()
    
    # 验证参数
    if not args.demo and not args.product_name:
        print("Error: Must provide --product-name and --images, or use --demo")
        print("Run with --help for usage information.")
        sys.exit(1)
    
    try:
        result = run_video_flow(args)
        if result:
            sys.exit(0)
        else:
            sys.exit(1)
    except KeyboardInterrupt:
        logger.info("Interrupted by user")
        sys.exit(130)
    except Exception as e:
        logger.exception(f"Unexpected error: {e}")
        sys.exit(1)


if __name__ == "__main__":
    main()