import os
import subprocess
from flask import Flask
from werkzeug.utils import secure_filename
from pdf2image import convert_from_path
from extensions import db
from models import Content, Player, Group
from utils.logger import log_content_added, log_upload, log_process

# Function to add image to playlist
def add_image_to_playlist(app, file, filename, duration, target_type, target_id):
    """
    Save the image file and add it to the playlist database.
    """
    # Use simple path resolution for containerized environment
    upload_folder = app.config['UPLOAD_FOLDER']
    # In container, working directory is /app, so static/uploads resolves correctly
    print(f"Upload folder config: {upload_folder}")
    
    # Ensure upload folder exists
    if not os.path.exists(upload_folder):
        os.makedirs(upload_folder, exist_ok=True)
        print(f"Created upload folder: {upload_folder}")
    
    file_path = os.path.join(upload_folder, filename)
    print(f"Saving image to: {file_path}")
    
    # Only save if file does not already exist
    if not os.path.exists(file_path):
        file.save(file_path)
        print(f"Image saved successfully: {file_path}")
    else:
        print(f"File already exists: {file_path}")

    print(f"Adding image to playlist: {filename}, Target Type: {target_type}, Target ID: {target_id}")

    if target_type == 'group':
        group = Group.query.get_or_404(target_id)
        for player in group.players:
            new_content = Content(file_name=filename, duration=duration, player_id=player.id)
            db.session.add(new_content)
        log_content_added(filename, target_type, group.name)
    elif target_type == 'player':
        player = Player.query.get_or_404(target_id)
        new_content = Content(file_name=filename, duration=duration, player_id=target_id)
        db.session.add(new_content)
        log_content_added(filename, target_type, player.username)

    db.session.commit()
    log_upload('image', filename, target_type, target_id)
    return True

# Video conversion functions
def convert_video(input_file, output_folder):
    print(f"Video conversion skipped for: {input_file}")
    return input_file

def convert_video_and_update_playlist(app, file_path, original_filename, target_type, target_id, duration, upload_progress=None, session_id=None, file_index=0, total_files=1):
    """
    Convert video to Raspberry Pi optimized format, then add to playlist.
    This ensures players only download optimized videos.
    
    Args:
        upload_progress (dict): Global progress tracking dictionary
        session_id (str): Unique session identifier for progress tracking
        file_index (int): Current file index being processed
        total_files (int): Total number of files being processed
    """
    import shutil
    import tempfile
    print(f"Starting video optimization for Raspberry Pi: {file_path}")
    
    # Update progress - conversion starting
    if upload_progress and session_id:
        print(f"[VIDEO CONVERSION] Setting initial progress for session {session_id}")
        upload_progress[session_id] = {
            'status': 'converting',
            'progress': 40,
            'message': f'Optimizing video for Raspberry Pi (30fps, H.264)...',
            'files_total': total_files,
            'files_processed': file_index
        }
        print(f"[VIDEO CONVERSION] Progress set: {upload_progress[session_id]}")
    else:
        print(f"[VIDEO CONVERSION] WARNING: upload_progress or session_id is None!")
    
    # Only process video files
    if not file_path.lower().endswith(('.mp4', '.avi', '.mkv', '.mov', '.webm')):
        print(f"Skipping non-video file: {file_path}")
        return None

    # Prepare temp output file
    temp_dir = tempfile.gettempdir()
    temp_output = os.path.join(temp_dir, f"optimized_{os.path.basename(file_path)}")
    
    # Enhanced ffmpeg command for Raspberry Pi optimization
    ffmpeg_cmd = [
        'ffmpeg', '-y', '-i', file_path,
        '-c:v', 'libx264',              # H.264 codec
        '-preset', 'medium',            # Balanced encoding speed/quality
        '-profile:v', 'main',           # Main profile for compatibility
        '-crf', '23',                   # Constant quality (23 is good balance)
        '-maxrate', '8M',               # Max bitrate 8Mbps
        '-bufsize', '12M',              # Buffer size
        '-vf', 'scale=\'min(1920,iw)\':\'min(1080,ih)\':force_original_aspect_ratio=decrease,fps=30',  # Scale down if needed, 30fps
        '-r', '30',                     # Output framerate 30fps
        '-c:a', 'aac',                  # AAC audio codec
        '-b:a', '128k',                 # Audio bitrate 128kbps
        '-movflags', '+faststart',      # Enable fast start for web streaming
        temp_output
    ]
    
    print(f"Running ffmpeg optimization: {' '.join(ffmpeg_cmd)}")
    print(f"Settings: 1920x1080 max, 30fps, H.264, 8Mbps max bitrate")
    
    # Update progress - conversion in progress
    if upload_progress and session_id:
        upload_progress[session_id]['progress'] = 50
        upload_progress[session_id]['message'] = 'Converting video (this may take a few minutes)...'
    
    try:
        result = subprocess.run(ffmpeg_cmd, capture_output=True, text=True, timeout=1800)
        if result.returncode != 0:
            print(f"ffmpeg error: {result.stderr}")
            print(f"Video conversion failed for: {original_filename}")
            
            # Update progress - error
            if upload_progress and session_id:
                upload_progress[session_id] = {
                    'status': 'error',
                    'progress': 0,
                    'message': f'Video conversion failed: {original_filename}',
                    'files_total': total_files,
                    'files_processed': file_index
                }
            
            # Delete the unconverted file
            if os.path.exists(file_path):
                os.remove(file_path)
                print(f"Removed unconverted video file: {file_path}")
            return None
        
        # Update progress - replacing file
        if upload_progress and session_id:
            upload_progress[session_id]['progress'] = 80
            upload_progress[session_id]['message'] = 'Saving optimized video and adding to playlist...'
        
        # Replace original file with optimized one
        shutil.move(temp_output, file_path)
        print(f"Video optimized and replaced: {file_path}")
        print(f"Video is now optimized for Raspberry Pi playback (30fps, max 1080p)")
        
        # NOW add to playlist after successful conversion
        with app.app_context():
            if target_type == 'group':
                group = Group.query.get_or_404(target_id)
                for player in group.players:
                    new_content = Content(file_name=original_filename, duration=duration, player_id=player.id)
                    db.session.add(new_content)
                    player.playlist_version += 1
                group.playlist_version += 1
                print(f"Video added to group '{group.name}' playlist after optimization")
            elif target_type == 'player':
                player = Player.query.get_or_404(target_id)
                new_content = Content(file_name=original_filename, duration=duration, player_id=target_id)
                db.session.add(new_content)
                player.playlist_version += 1
                print(f"Video added to player '{player.username}' playlist after optimization")
            
            db.session.commit()
            print(f"Playlist updated with optimized video: {original_filename}")
        
        # Update progress - complete
        if upload_progress and session_id:
            print(f"[VIDEO CONVERSION] Video conversion complete! Updating progress for session {session_id}")
            upload_progress[session_id] = {
                'status': 'complete',
                'progress': 100,
                'message': f'Video conversion complete! Added to playlist.',
                'files_total': total_files,
                'files_processed': file_index + 1
            }
            print(f"[VIDEO CONVERSION] Final progress: {upload_progress[session_id]}")
        else:
            print(f"[VIDEO CONVERSION] WARNING: Cannot update completion status - upload_progress or session_id is None!")
        
        return True
        
    except Exception as e:
        print(f"[VIDEO CONVERSION] ERROR during video optimization: {e}")
        import traceback
        traceback.print_exc()
        
        # Update progress - error
        if upload_progress and session_id:
            print(f"[VIDEO CONVERSION] Setting error status for session {session_id}")
            upload_progress[session_id] = {
                'status': 'error',
                'progress': 0,
                'message': f'Error during video conversion: {str(e)}',
                'files_total': total_files,
                'files_processed': file_index
            }
        else:
            print(f"[VIDEO CONVERSION] WARNING: Cannot update error status - upload_progress or session_id is None!")
        
        # Delete the unconverted file on error
        if os.path.exists(file_path):
            os.remove(file_path)
            print(f"Removed unconverted video file due to error: {file_path}")
        return None
    
    # Filename remains the same
    return True

# PDF conversion functions
def convert_pdf_to_images(pdf_file, output_folder, delete_pdf=True, dpi=300):
    """
    Convert a PDF file to high-quality JPG images in sequential order.
    Uses standard 300 DPI for reliable conversion.
    """
    print(f"Converting PDF to JPG images: {pdf_file} at {dpi} DPI")
    print(f"Output folder: {output_folder}")
    
    try:
        # Ensure output folder exists
        if not os.path.exists(output_folder):
            os.makedirs(output_folder, exist_ok=True)
            print(f"Created output folder: {output_folder}")
        
        # Convert PDF to images using pdf2image
        print("Starting PDF conversion...")
        images = convert_from_path(pdf_file, dpi=dpi)
        print(f"PDF converted to {len(images)} page(s)")
        
        if not images:
            print("ERROR: No images generated from PDF")
            return []
        
        base_name = os.path.splitext(os.path.basename(pdf_file))[0]
        image_filenames = []

        # Save each page as JPG image
        for i, image in enumerate(images):
            # Convert to RGB if necessary
            if image.mode != 'RGB':
                image = image.convert('RGB')
            
            # Simple naming with page numbers
            page_num = str(i + 1).zfill(3)  # e.g., 001, 002, etc.
            image_filename = f"{base_name}_page_{page_num}.jpg"
            image_path = os.path.join(output_folder, image_filename)
            
            # Save as JPG
            image.save(image_path, 'JPEG', quality=85, optimize=True)
            image_filenames.append(image_filename)
            print(f"Saved page {i + 1} to: {image_path}")

        print(f"PDF conversion complete. {len(image_filenames)} JPG images saved to {output_folder}")
        
        # Delete the PDF file if requested and conversion was successful
        if delete_pdf and os.path.exists(pdf_file) and image_filenames:
            os.remove(pdf_file)
            print(f"PDF file deleted: {pdf_file}")
        
        return image_filenames
        
    except Exception as e:
        print(f"Error converting PDF to JPG images: {e}")
        import traceback
        traceback.print_exc()
        return []

def update_playlist_with_files(image_filenames, duration, target_type, target_id):
    """
    Add files to a player or group playlist and update version numbers.
    
    Args:
        image_filenames (list): List of filenames to add to playlist
        duration (int): Duration in seconds for each file
        target_type (str): 'player' or 'group'
        target_id (int): ID of the player or group
        
    Returns:
        bool: True if successful, False otherwise
    """
    try:
        if target_type == 'group':
            group = Group.query.get_or_404(target_id)
            for player in group.players:
                for image_filename in image_filenames:
                    new_content = Content(file_name=image_filename, duration=duration, player_id=player.id)
                    db.session.add(new_content)
                player.playlist_version += 1
            group.playlist_version += 1
        elif target_type == 'player':
            player = Player.query.get_or_404(target_id)
            for image_filename in image_filenames:
                new_content = Content(file_name=image_filename, duration=duration, player_id=target_id)
                db.session.add(new_content)
            player.playlist_version += 1
        else:
            print(f"Invalid target type: {target_type}")
            return False

        db.session.commit()
        print(f"Added {len(image_filenames)} files to playlist")
        return True
    except Exception as e:
        db.session.rollback()
        print(f"Error updating playlist: {e}")
        return False

def process_pdf(input_file, output_folder, duration, target_type, target_id, upload_progress=None, session_id=None, file_index=0, total_files=1):
    """
    Process a PDF file: convert to images and update playlist.
    
    Args:
        input_file (str): Path to the PDF file
        output_folder (str): Path to save the images
        duration (int): Duration in seconds for each image
        target_type (str): 'player' or 'group'
        target_id (int): ID of the player or group
        upload_progress (dict): Global progress tracking dictionary
        session_id (str): Unique session identifier for progress tracking
        file_index (int): Current file index being processed
        total_files (int): Total number of files being processed
        
    Returns:
        bool: True if successful, False otherwise
    """
    print(f"Processing PDF file: {input_file}")
    print(f"Output folder: {output_folder}")
    
    # Update progress - starting PDF conversion
    if upload_progress and session_id:
        upload_progress[session_id] = {
            'status': 'converting',
            'progress': 50,
            'message': f'Converting PDF to images (300 DPI)...',
            'files_total': total_files,
            'files_processed': file_index
        }
    
    # Ensure output folder exists
    if not os.path.exists(output_folder):
        os.makedirs(output_folder, exist_ok=True)
        print(f"Created output folder: {output_folder}")
    
    # Convert PDF to images using standard quality (delete PDF after successful conversion)
    image_filenames = convert_pdf_to_images(input_file, output_folder, delete_pdf=True, dpi=300)
    
    # Update progress - adding to playlist
    if upload_progress and session_id:
        upload_progress[session_id]['progress'] = 80
        upload_progress[session_id]['message'] = f'Adding {len(image_filenames)} images to playlist...'
    
    # Update playlist with generated images
    if image_filenames:
        success = update_playlist_with_files(image_filenames, duration, target_type, target_id)
        if success:
            print(f"Successfully processed PDF: {len(image_filenames)} images added to playlist")
            
            # Update progress - complete
            if upload_progress and session_id:
                upload_progress[session_id] = {
                    'status': 'complete',
                    'progress': 100,
                    'message': f'PDF converted to {len(image_filenames)} images and added to playlist!',
                    'files_total': total_files,
                    'files_processed': file_index + 1
                }
        return success
    else:
        print("Failed to convert PDF to images")
        
        # Update progress - error
        if upload_progress and session_id:
            upload_progress[session_id] = {
                'status': 'error',
                'progress': 0,
                'message': 'Failed to convert PDF to images',
                'files_total': total_files,
                'files_processed': file_index
            }
        return False

def process_pptx(input_file, output_folder, duration, target_type, target_id, upload_progress=None, session_id=None, file_index=0, total_files=1):
    """
    Process a PPTX file: convert to PDF first, then to JPG images (same workflow as PDF).
    
    Args:
        input_file (str): Path to the PPTX file
        output_folder (str): Path to save the images
        duration (int): Duration in seconds for each image
        target_type (str): 'player' or 'group'
        target_id (int): ID of the player or group
        upload_progress (dict): Global progress tracking dictionary
        session_id (str): Unique session identifier for progress tracking
        file_index (int): Current file index being processed
        total_files (int): Total number of files being processed
        
    Returns:
        bool: True if successful, False otherwise
    """
    print(f"Processing PPTX file using PDF workflow: {input_file}")
    print(f"Output folder: {output_folder}")
    
    # Update progress - starting PPTX conversion (step 1)
    if upload_progress and session_id:
        upload_progress[session_id] = {
            'status': 'converting',
            'progress': 40,
            'message': f'Converting PowerPoint to PDF (Step 1/3)...',
            'files_total': total_files,
            'files_processed': file_index
        }
    
    # Ensure output folder exists
    if not os.path.exists(output_folder):
        os.makedirs(output_folder, exist_ok=True)
        print(f"Created output folder: {output_folder}")
    
    try:
        # Step 1: Convert PPTX to PDF using LibreOffice for vector quality
        print("Step 1: Converting PPTX to PDF...")
        from utils.pptx_converter import pptx_to_pdf_libreoffice
        pdf_file = pptx_to_pdf_libreoffice(input_file, output_folder)
        
        if not pdf_file:
            print("Error: Failed to convert PPTX to PDF")
            print("This could be due to:")
            print("- LibreOffice not properly installed")
            print("- Corrupted PPTX file")
            print("- Insufficient memory")
            print("- File permission issues")
            
            # Update progress - error
            if upload_progress and session_id:
                upload_progress[session_id] = {
                    'status': 'error',
                    'progress': 0,
                    'message': 'Failed to convert PowerPoint to PDF',
                    'files_total': total_files,
                    'files_processed': file_index
                }
            return False
            
        print(f"PPTX successfully converted to PDF: {pdf_file}")
        
        # Update progress - step 2
        if upload_progress and session_id:
            upload_progress[session_id]['progress'] = 60
            upload_progress[session_id]['message'] = 'Converting PDF to images (Step 2/3, 300 DPI)...'
        
        # Step 2: Use the same PDF to images workflow as direct PDF uploads
        print("Step 2: Converting PDF to JPG images...")
        # Convert PDF to JPG images (300 DPI, same as PDF workflow)
        image_filenames = convert_pdf_to_images(pdf_file, output_folder, delete_pdf=True, dpi=300)
        
        if not image_filenames:
            print("Error: Failed to convert PDF to images")
            print("This could be due to:")
            print("- poppler-utils not properly installed")
            print("- PDF corruption during conversion")
            print("- Insufficient disk space")
            print("- Memory issues during image processing")
            
            # Update progress - error
            if upload_progress and session_id:
                upload_progress[session_id] = {
                    'status': 'error',
                    'progress': 0,
                    'message': 'Failed to convert PDF to images',
                    'files_total': total_files,
                    'files_processed': file_index
                }
            return False
        
        print(f"Generated {len(image_filenames)} JPG images from PPTX → PDF")
        
        # Step 3: Delete the original PPTX file after successful conversion
        if os.path.exists(input_file):
            os.remove(input_file)
            print(f"Original PPTX file deleted: {input_file}")
        
        # Update progress - step 3
        if upload_progress and session_id:
            upload_progress[session_id]['progress'] = 85
            upload_progress[session_id]['message'] = f'Adding {len(image_filenames)} images to playlist (Step 3/3)...'
        
        # Step 4: Update playlist with generated images in sequential order
        print("Step 3: Adding images to playlist...")
        success = update_playlist_with_files(image_filenames, duration, target_type, target_id)
        if success:
            print(f"Successfully processed PPTX: {len(image_filenames)} images added to playlist")
            
            # Update progress - complete
            if upload_progress and session_id:
                upload_progress[session_id] = {
                    'status': 'complete',
                    'progress': 100,
                    'message': f'PowerPoint converted to {len(image_filenames)} images and added to playlist!',
                    'files_total': total_files,
                    'files_processed': file_index + 1
                }
        else:
            print("Error: Failed to add images to playlist database")
        return success
        
    except Exception as e:
        print(f"Error processing PPTX file: {e}")
        import traceback
        traceback.print_exc()
        return False

def process_uploaded_files(app, files, media_type, duration, target_type, target_id, upload_progress=None, session_id=None):
    """
    Process uploaded files based on media type and add them to playlists.
    
    Args:
        upload_progress (dict): Global progress tracking dictionary
        session_id (str): Unique session identifier for progress tracking
    
    Returns:
        list: List of result dictionaries with success status and messages
    """
    results = []
    
    # Get target name for logging
    target_name = ""
    if target_type == 'group':
        group = Group.query.get_or_404(target_id)
        target_name = group.name
    elif target_type == 'player':
        player = Player.query.get_or_404(target_id)
        target_name = player.username
    
    total_files = len(files)
    
    for file_index, file in enumerate(files):
        try:
            # Update progress - uploading phase
            if upload_progress and session_id:
                file_progress = int((file_index / total_files) * 30)  # 0-30% for file uploads
                upload_progress[session_id] = {
                    'status': 'uploading',
                    'progress': file_progress,
                    'message': f'Uploading file {file_index + 1}/{total_files}: {file.filename}...',
                    'files_total': total_files,
                    'files_processed': file_index
                }
            
            # Generate a secure filename and save the file
            filename = secure_filename(file.filename)
            
            # Use simple path resolution for containerized environment
            upload_folder = app.config['UPLOAD_FOLDER']
            print(f"Upload folder: {upload_folder}")
            
            # Ensure upload folder exists
            if not os.path.exists(upload_folder):
                os.makedirs(upload_folder, exist_ok=True)
                print(f"Created upload folder: {upload_folder}")
            
            file_path = os.path.join(upload_folder, filename)
            file.save(file_path)
            print(f"File saved to: {file_path}")
            
            print(f"Processing file: {filename}, Media Type: {media_type}")
            result = {'filename': filename, 'success': True, 'message': ''}
            
            if media_type == 'image':
                if upload_progress and session_id:
                    upload_progress[session_id]['message'] = f'Adding image {file_index + 1}/{total_files} to playlist...'
                    upload_progress[session_id]['progress'] = int(30 + (file_index / total_files) * 70)
                
                add_image_to_playlist(app, file, filename, duration, target_type, target_id)
                result['message'] = f"Image {filename} added to playlist"
                log_upload('image', filename, target_type, target_id)
                
            elif media_type == 'video':
                # For videos, save file then start conversion in background
                # Video will be added to playlist AFTER conversion completes
                print(f"Video uploaded: {filename}")
                print(f"Starting background optimization - video will be added to playlist when ready")
                
                if upload_progress and session_id:
                    upload_progress[session_id] = {
                        'status': 'converting',
                        'progress': 40,
                        'message': f'Converting video {file_index + 1}/{total_files} to 30fps (this may take a few minutes)...',
                        'files_total': total_files,
                        'files_processed': file_index
                    }
                
                # Start background conversion using absolute path
                import threading
                print(f"[VIDEO UPLOAD] Starting background thread for video conversion. Session ID: {session_id}")
                print(f"[VIDEO UPLOAD] Parameters: file_path={file_path}, filename={filename}, target={target_type}/{target_id}")
                thread = threading.Thread(target=convert_video_and_update_playlist, 
                                args=(app, file_path, filename, target_type, target_id, duration, upload_progress, session_id, file_index, total_files))
                thread.daemon = True  # Make thread daemon so it doesn't block shutdown
                thread.start()
                print(f"[VIDEO UPLOAD] Background thread started: {thread.name}")
                result['message'] = f"Video {filename} is being optimized for Raspberry Pi (30fps, max 1080p). It will be added to playlist when ready."
                log_upload('video', filename, target_type, target_id)
                
            elif media_type == 'pdf':
                if upload_progress and session_id:
                    upload_progress[session_id] = {
                        'status': 'converting',
                        'progress': 40,
                        'message': f'Converting PDF {file_index + 1}/{total_files} to images...',
                        'files_total': total_files,
                        'files_processed': file_index
                    }
                
                # For PDFs, convert to images and update playlist using absolute path
                success = process_pdf(file_path, upload_folder, 
                                    duration, target_type, target_id, upload_progress, session_id, file_index, total_files)
                if success:
                    result['message'] = f"PDF {filename} processed successfully"
                    log_process('pdf', filename, target_type, target_id)
                else:
                    result['success'] = False
                    result['message'] = f"Error processing PDF file: {filename}"
                    
            elif media_type == 'ppt':
                if upload_progress and session_id:
                    upload_progress[session_id] = {
                        'status': 'converting',
                        'progress': 30,
                        'message': f'Converting PowerPoint {file_index + 1}/{total_files} to images (PPTX → PDF → Images, may take 2-5 minutes)...',
                        'files_total': total_files,
                        'files_processed': file_index
                    }
                
                # For PPT/PPTX, convert to PDF, then to images, and update playlist using absolute path
                success = process_pptx(file_path, upload_folder, 
                                     duration, target_type, target_id, upload_progress, session_id, file_index, total_files)
                if success:
                    result['message'] = f"PowerPoint {filename} processed successfully"
                    log_process('ppt', filename, target_type, target_id)
                else:
                    result['success'] = False
                    result['message'] = f"Error processing PowerPoint file: {filename}"

            results.append(result)
            
        except Exception as e:
            print(f"Error processing file {file.filename}: {e}")
            results.append({
                'filename': file.filename,
                'success': False,
                'message': f"Error processing file {file.filename}: {str(e)}"
            })
            
    return results