"""
Gradio UI for Video Summarizer
"""

import gradio as gr
import os
import json
import shutil
import tempfile
import re
import yt_dlp
from video_summarizer import VideoSummarizer
from dotenv import load_dotenv

# Load environment variables
load_dotenv()

# Get OpenRouter API key from environment or use default
OPENROUTER_API_KEY = os.getenv(
    "OPENROUTER_API_KEY", 
    "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"
)

# Initialize summarizer (lazy loading)
summarizer = None


def initialize_summarizer():
    """Initialize the summarizer (lazy loading)"""
    global summarizer
    if summarizer is None:
        summarizer = VideoSummarizer(
            openrouter_api_key=OPENROUTER_API_KEY,
            openrouter_model="kwaipilot/kat-coder-pro:free"
        )
    return summarizer


def is_youtube_url(url):
    """Check if the input is a valid YouTube URL"""
    youtube_patterns = [
        r'(https?://)?(www\.)?(youtube|youtu|youtube-nocookie)\.(com|be)/',
        r'(https?://)?(www\.)?youtube\.com/watch\?v=',
        r'(https?://)?(www\.)?youtu\.be/',
    ]
    return any(re.match(pattern, url) for pattern in youtube_patterns)


def download_youtube_video(url, output_dir="temp_videos"):
    """
    Download YouTube video
    
    Args:
        url: YouTube video URL
        output_dir: Directory to save the video
    
    Returns:
        Path to downloaded video file or None if failed
    """
    try:
        os.makedirs(output_dir, exist_ok=True)
        
        # Configure yt-dlp options with better error handling
        ydl_opts = {
            'format': 'best[ext=mp4][filesize<20M]/best[ext=mp4]/best',  # Prefer MP4, limit size
            'outtmpl': os.path.join(output_dir, '%(id)s.%(ext)s'),
            'quiet': False,
            'no_warnings': False,
            'socket_timeout': 30,
            'retries': 3,
            'fragment_retries': 3,
            'extractor_retries': 3,
            # Add proxy support if needed
            'nocheckcertificate': True,
        }
        
        print(f"📥 Downloading YouTube video: {url}")
        
        with yt_dlp.YoutubeDL(ydl_opts) as ydl:
            info = ydl.extract_info(url, download=True)
            video_path = ydl.prepare_filename(info)
            
            # Check file size
            if os.path.exists(video_path):
                file_size_mb = os.path.getsize(video_path) / (1024 * 1024)
                if file_size_mb > 20:
                    os.remove(video_path)
                    return None, f"❌ Video size ({file_size_mb:.1f} MB) exceeds 20 MB limit"
                
                print(f"✅ Video downloaded: {video_path} ({file_size_mb:.1f} MB)")
                return video_path, None
            
        return None, "❌ Failed to download video"
    
    except Exception as e:
        error_msg = str(e)
        print(f"❌ Error downloading video: {error_msg}")
        
        # Provide more helpful error messages
        if "Failed to resolve" in error_msg or "No address associated" in error_msg:
            return None, "❌ Network error: Cannot connect to YouTube. This may be due to network restrictions on Hugging Face Spaces. Please try uploading the video file directly instead."
        elif "HTTP Error 429" in error_msg:
            return None, "❌ YouTube rate limit reached. Please try again later or upload the video file directly."
        elif "Video unavailable" in error_msg:
            return None, "❌ This video is unavailable or private. Please check the URL or upload the video file directly."
        else:
            return None, f"❌ Error downloading video: {error_msg}. Please try uploading the video file directly."


def list_existing_clips(clips_dir="clips"):
    """
    List existing video clips in the clips directory
    
    Args:
        clips_dir: Directory to search for clips
    
    Returns:
        List of video clip paths and status message
    """
    try:
        if not os.path.exists(clips_dir):
            return [], f"📁 Clips directory not found: {clips_dir}"
        
        # Find all video files in the directory
        video_extensions = ['.mp4', '.avi', '.mov', '.mkv', '.webm']
        clip_paths = []
        
        for filename in os.listdir(clips_dir):
            file_path = os.path.join(clips_dir, filename)
            if os.path.isfile(file_path):
                # Check if it's a video file
                _, ext = os.path.splitext(filename.lower())
                if ext in video_extensions:
                    clip_paths.append(file_path)
        
        # Sort by filename for consistent ordering
        clip_paths.sort()
        
        if clip_paths:
            status_msg = (
                f"✅ Found {len(clip_paths)} existing clip(s)\n"
                f"📁 Location: {clips_dir}\n"
                f"💡 Click on clips to preview"
            )
            return clip_paths, status_msg
        else:
            return [], "📭 No video clips found. Generate some clips first!"
    
    except Exception as e:
        error_msg = f"❌ Error listing clips: {str(e)}"
        print(error_msg)
        return [], error_msg


def view_identified_segments(clips_dir="clips"):
    """
    View identified segments (including failed ones) from the last processing run
    
    Args:
        clips_dir: Directory to search for segment files
    
    Returns:
        Formatted string with segment information
    """
    try:
        if not os.path.exists(clips_dir):
            return "📁 Clips directory not found"
        
        segments_path = os.path.join(clips_dir, "segments.json")
        failed_path = os.path.join(clips_dir, "failed_segments.json")
        
        output_lines = []
        
        # Load identified segments
        if os.path.exists(segments_path):
            with open(segments_path, 'r', encoding='utf-8') as f:
                segments = json.load(f)
            
            output_lines.append(f"## 📋 Identified Segments ({len(segments)})\n\n")
            for i, seg in enumerate(segments, 1):
                start = seg.get('start', 0)
                end = seg.get('end', 0)
                text = seg.get('text', 'No description')
                duration = end - start
                output_lines.append(
                    f"**Clip {i}:** `{start:.2f}s - {end:.2f}s` ({duration:.2f}s)\n"
                    f"> {text}\n\n"
                )
        else:
            output_lines.append("📋 No segments file found\n")
        
        # Load failed segments
        if os.path.exists(failed_path):
            with open(failed_path, 'r', encoding='utf-8') as f:
                failed = json.load(f)
            
            if failed:
                output_lines.append(f"\n---\n\n## ⚠️ Failed Clips ({len(failed)})\n\n")
                for seg in failed:
                    start = seg.get('start', 0)
                    end = seg.get('end', 0)
                    error = seg.get('error', 'Unknown error')
                    output_lines.append(
                        f"**Segment {seg.get('segment_num', '?')}:** `{start:.2f}s - {end:.2f}s`\n"
                        f"> ❌ Error: {error}\n\n"
                    )
        
        if len(output_lines) == 1 and "No segments file found" in output_lines[0]:
            return "## 📭 No Information Available\n\nGenerate clips first to see segment details."
        
        return "".join(output_lines)
    
    except Exception as e:
        error_msg = f"❌ Error reading segments: {str(e)}"
        print(error_msg)
        return error_msg


def process_video(video_file, youtube_url, num_clips, progress=gr.Progress()):
    """
    Process video and generate clips
    
    Args:
        video_file: Uploaded video file
        youtube_url: YouTube URL (optional)
        num_clips: Number of clips to generate
        progress: Gradio progress tracker
    
    Returns:
        List of video clip paths and status message
    """
    video_path = None
    temp_video = None
    
    try:
        # Validate inputs
        progress(0, desc="🔍 Validating inputs...")
        num_clips = int(num_clips)
        if num_clips < 1 or num_clips > 5:
            return None, "❌ Number of clips must be between 1 and 5"
        
        # Check if YouTube URL is provided
        if youtube_url and youtube_url.strip():
            if not is_youtube_url(youtube_url):
                return None, "❌ Invalid YouTube URL"
            
            # Download YouTube video
            progress(0.05, desc="📥 Downloading video from YouTube...")
            video_path, error = download_youtube_video(youtube_url)
            if error:
                return None, error
            temp_video = video_path  # Mark for cleanup
            progress(0.15, desc="✅ Video downloaded successfully")
        
        # Otherwise use uploaded file
        elif video_file is not None:
            progress(0.05, desc="📤 Processing uploaded video...")
            # Handle video file path (Gradio 6.x returns string directly)
            if isinstance(video_file, str):
                video_path = video_file
            elif hasattr(video_file, 'name'):
                video_path = video_file.name
            else:
                return None, "❌ Invalid video file format"
            
            # Check file size (20 MB limit)
            if os.path.exists(video_path):
                file_size_mb = os.path.getsize(video_path) / (1024 * 1024)
                if file_size_mb > 20:
                    return None, f"❌ File size ({file_size_mb:.1f} MB) exceeds 20 MB limit"
            progress(0.15, desc="✅ Video file ready")
        else:
            return None, "❌ Please upload a video file or provide a YouTube URL"
        
        # Initialize summarizer
        progress(0.2, desc="🔧 Initializing summarizer...")
        summarizer = initialize_summarizer()
        
        # Use absolute path in current working directory (Gradio can access this)
        clips_dir = os.path.abspath("clips")
        os.makedirs(clips_dir, exist_ok=True)
        
        # Process video with detailed progress tracking
        def progress_update(value, desc):
            progress(value, desc=desc)
        
        clip_paths = summarizer.process_video(
            video_path=video_path,
            num_clips=num_clips,
            output_dir=clips_dir,
            progress_callback=progress_update
        )
        
        if not clip_paths:
            return None, "❌ Failed to generate clips"
        
        progress(1.0, desc="✅ Complete!")
        
        # Return clips with detailed status
        status_msg = (
            f"✅ **Success!** Generated {len(clip_paths)} clip(s)\n"
            f"📁 Clips saved to: {clips_dir}\n"
            f"💡 Click on clips to preview, or use 'View Segment Details' for more info"
        )
        return clip_paths, status_msg
    
    except Exception as e:
        error_msg = f"❌ Error processing video: {str(e)}"
        print(error_msg)
        return None, error_msg
    
    finally:
        # Clean up temporary YouTube video
        if temp_video and os.path.exists(temp_video):
            try:
                os.remove(temp_video)
                print(f"🗑️ Cleaned up temporary file: {temp_video}")
            except:
                pass


# Create Gradio interface
# Gradio 6.x compatibility - theme is set differently
demo = gr.Blocks(title="Video Summarizer - Arabic")

with demo:
    gr.Markdown("""
    # 🎬 Video Summarizer - Arabic Edition
    
    AI-powered tool that processes Arabic videos and automatically generates short highlight clips.
    
    **Features:**
    - 🎤 Arabic speech recognition using Whisper + LoRA
    - 🤖 AI-powered highlight detection via OpenRouter
    - ✂️ Automatic video clip generation
    - 🔗 Support for YouTube URLs (may not work on all platforms due to network restrictions)
    
    **Limitations:**
    - Maximum file size: 20 MB
    - Maximum duration: 12 minutes
    - Number of clips: 1-5
    
    **Note:** If YouTube download fails, please download the video and upload it directly.
    """)
    
    with gr.Row():
        with gr.Column(scale=1):
            gr.Markdown("### 📥 Input")
            
            youtube_url = gr.Textbox(
                label="🔗 YouTube URL (Optional)",
                placeholder="https://www.youtube.com/watch?v=...",
                lines=1,
                info="Paste a YouTube URL here"
            )
            
            gr.Markdown("**— OR —**", elem_classes="text-center")
            
            video_input = gr.Video(
                label="📤 Upload Video File",
                # type parameter removed for Gradio 6.x compatibility
            )
            
            num_clips = gr.Slider(
                minimum=1,
                maximum=5,
                value=3,
                step=1,
                label="🎬 Number of Clips to Generate",
                info="Choose between 1-5 highlight clips"
            )
            
            with gr.Row():
                generate_btn = gr.Button(
                    "🚀 Generate Shorts", 
                    variant="primary", 
                    size="lg",
                    scale=2
                )
                view_clips_btn = gr.Button(
                    "📁 View Saved Clips", 
                    variant="secondary",
                    scale=1
                )
            
            status = gr.Textbox(
                label="📊 Status",
                interactive=False,
                lines=2
            )
        
        with gr.Column(scale=1):
            gr.Markdown("### 🎥 Generated Clips")
            
            clips_gallery = gr.Gallery(
                label="Video Clips",
                show_label=False,
                elem_id="gallery",
                columns=2,
                rows=3,
                height="600px",
                object_fit="contain",
                preview=True
            )
            
            view_segments_btn = gr.Button(
                "📋 View Segment Details", 
                variant="secondary",
                size="sm"
            )
            
            segments_info = gr.Markdown(
                value="",
                visible=True
            )
    
    # Set up event handlers
    generate_btn.click(
        fn=process_video,
        inputs=[video_input, youtube_url, num_clips],
        outputs=[clips_gallery, status]
    )
    
    view_clips_btn.click(
        fn=list_existing_clips,
        inputs=[],
        outputs=[clips_gallery, status]
    )
    
    view_segments_btn.click(
        fn=view_identified_segments,
        inputs=[],
        outputs=[segments_info]
    )
    
    with gr.Accordion("📖 Instructions & Details", open=False):
        gr.Markdown("""
        ### 📝 How to Use:
        
        1. **Choose Input Method:**
           - Paste a YouTube URL, **OR**
           - Upload your Arabic video file (max 20 MB)
        
        2. **Select Number of Clips:**
           - Use the slider to choose 1-5 highlight clips
        
        3. **Generate:**
           - Click "🚀 Generate Shorts" and wait for processing
           - Progress will be shown in real-time
        
        4. **View Results:**
           - Clips appear in the gallery on the right
           - Click on any clip to preview it
           - Use "📋 View Segment Details" to see timestamps and descriptions
        
        ---
        
        ### 🔧 Features:
        
        - **📁 View Saved Clips**: Access previously generated clips
        - **📋 Segment Details**: See what the AI identified in your video
        - **Real-time Progress**: Track each processing step
        
        ---
        
        ### ⚙️ Technical Details:
        
        - **ASR Model**: Whisper-small + LoRA (Arabic Egyptian dialect)
        - **AI Analysis**: OpenRouter API (kwaipilot/kat-coder-pro:free)
        - **Video Processing**: MoviePy with FFmpeg
        - **Supported Formats**: MP4, AVI, MOV, MKV, WebM, and more
        
        ---
        
        ### ⚠️ Limitations:
        
        - Maximum file size: 20 MB
        - Maximum duration: ~12 minutes
        - Clips range: 1-5 per video
        - YouTube downloads may fail due to network restrictions (use file upload instead)
        """)

if __name__ == "__main__":
    # Create clips directory in current working directory (Gradio can access this)
    clips_dir = os.path.abspath("clips")
    os.makedirs(clips_dir, exist_ok=True)
    
    # Also allow /tmp/clips as fallback (for any existing clips)
    import tempfile
    temp_clips_dir = "/tmp/clips"
    
    # Launch Gradio app with allowed paths
    # Clips are saved in "clips" directory in current working directory
    demo.launch(
        allowed_paths=[clips_dir, temp_clips_dir]  # Allow both directories
    )