import os
import subprocess
import uuid
import imageio_ffmpeg
from typing import List, Optional, Tuple, Any

# Import existing functions - avoid circular imports
from ffmpeg_utils import extract_clip_ffmpeg, get_video_info_ffmpeg

def should_use_ffmpeg_processing(timestamps, custom_dims, export_audio, bg_music, output_format, subtitle_path=None) -> bool:
    # FFmpeg can now handle background music mixing and all ShortsStyle!
    # Default to True to use FFmpeg optimization for most cases
    return True

def process_single_clip_hybrid(video_path: str, start_time: float, end_time: float, clip_id: str,
                              output_format: Any, custom_dims: Optional[Any] = None,
                              export_audio: bool = True, bg_music: Optional[str] = None,
                              aspect_ratio: Optional[Any] = None,
                              subtitle_path: Optional[str] = None) -> str:
    """
    Hybrid clip processing: FFmpeg for speed, MoviePy for features
    """
    try:
        from schemas import ShortsStyle, AspectRatio
        from routers.video import PROCESSED_DIR
        
        # Generate output path in the PROCESSED folder
        output_path = os.path.join(PROCESSED_DIR, f"clip_{clip_id}.mp4")
        
        # Check if we can use FFmpeg for this clip
        can_use_ffmpeg = should_use_ffmpeg_processing(
            [type('obj', (object,), {'start_time': start_time, 'end_time': end_time})], 
            custom_dims, export_audio, bg_music, output_format, subtitle_path=subtitle_path
        )
        
        if can_use_ffmpeg:
            # Use FFmpeg for speed
            print(f"🚀 Using FFmpeg for clip {clip_id} (Style: {output_format})")
            
            # Map custom_dims or output_format to style
            style = output_format if isinstance(output_format, ShortsStyle) else None
            
            return extract_clip_ffmpeg(
                video_path, start_time, end_time, output_path, 
                target_width=custom_dims.width if hasattr(custom_dims, 'width') else None,
                target_height=custom_dims.height if hasattr(custom_dims, 'height') else None,
                include_audio=True, # Video should always have audio if it exists
                style=style,
                aspect_ratio=aspect_ratio,
                bg_music_path=bg_music,
                video_volume=custom_dims.video_volume if hasattr(custom_dims, 'video_volume') else 1.0,
                music_volume=custom_dims.music_volume if hasattr(custom_dims, 'music_volume') else 0.2,
                loop_music=custom_dims.loop_music if hasattr(custom_dims, 'loop_music') else True,
                subtitle_path=subtitle_path
            )
        else:
            # Use MoviePy for features (fallback)
            print(f"🎬 Using MoviePy for clip {clip_id}")
            # Import here to avoid circular imports
            from video_processor import process_single_clip as moviepy_process_single_clip
            return moviepy_process_single_clip(video_path, start_time, end_time, clip_id, output_format, custom_dims, export_audio, bg_music, subtitle_path=subtitle_path)
            
    except Exception as e:
        print(f"❌ Hybrid processing failed for clip {clip_id}: {e}")
        raise

def process_video_hybrid(video_path: str, timestamps, output_format, custom_dims=None, 
                         export_audio=True, bg_music=None, aspect_ratio=None, 
                         subtitle_paths: Optional[List[str]] = None) -> tuple:
    """
    Process video using hybrid approach (FFmpeg + MoviePy)
    Returns: (clip_paths, audio_paths)
    """
    clip_paths = []
    audio_paths = []
    
    try:
        # Create temp directory
        os.makedirs("temp_videos", exist_ok=True)
        
        # Check if we can use FFmpeg for the entire video
        # Passing None for subtitle_path here as it's checked per-clip in process_single_clip_hybrid
        can_use_ffmpeg = should_use_ffmpeg_processing(timestamps, custom_dims, export_audio, bg_music, output_format)
        
        if can_use_ffmpeg:
            print(f"🚀 Using FFmpeg optimization for entire video (Style: {output_format})")
            # Process all clips with FFmpeg
            for i, ts in enumerate(timestamps):
                current_subtitle = subtitle_paths[i] if subtitle_paths and i < len(subtitle_paths) else None
                clip_path = process_single_clip_hybrid(
                    video_path, ts.start_time, ts.end_time, f"hybrid_{i}_{uuid.uuid4().hex[:4]}",
                    output_format, custom_dims, export_audio, bg_music,
                    aspect_ratio=aspect_ratio,
                    subtitle_path=current_subtitle
                )
                clip_paths.append(clip_path)
                
                # If separate audio export is requested
                if export_audio:
                    from routers.video import AUDIO_DIR
                    audio_path = os.path.join(AUDIO_DIR, f"audio_hybrid_{i}_{uuid.uuid4().hex[:4]}.mp3")
                    # Extract audio using FFmpeg
                    cmd = [
                        imageio_ffmpeg.get_ffmpeg_exe(),
                        '-i', clip_path,
                        '-vn',
                        '-acodec', 'libmp3lame',
                        '-y', audio_path
                    ]
                    subprocess.run(cmd, check=True, capture_output=True)
                    audio_paths.append(audio_path)
        else:
            print("🎬 Using MoviePy for complex processing")
            # Fallback to MoviePy for complex cases
            # This will be handled by the calling function
            return [], []
            
        return clip_paths, audio_paths
        
    except Exception as e:
        print(f"❌ Hybrid video processing failed: {e}")
        # Clean up any partial results
        for path in clip_paths + audio_paths:
            if os.path.exists(path):
                os.remove(path)
        return [], []