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):
    """
    Converts a video file to MP4 format with H.264 codec.
    """
    # Use simple path resolution for containerized environment
    if not os.path.isabs(output_folder):
        # In container, relative paths work from /app directory
        print(f"Using relative path: {output_folder}")
    else:
        print(f"Using absolute path: {output_folder}")
    
    if not os.path.exists(output_folder):
        os.makedirs(output_folder, exist_ok=True)
        print(f"Created output folder: {output_folder}")

    # Generate the output file path
    base_name = os.path.splitext(os.path.basename(input_file))[0]
    output_file = os.path.join(output_folder, f"{base_name}.mp4")
    print(f"Converting video: {input_file} -> {output_file}")

    # FFmpeg command to convert the video
    command = [
        "ffmpeg",
        "-i", input_file,                # Input file
        "-c:v", "libx264",               # Video codec: H.264
        "-preset", "fast",               # Encoding speed/quality tradeoff
        "-crf", "23",                    # Constant Rate Factor (quality, lower is better)
        "-vf", "scale=-1:1080",          # Scale video to 1080p (preserve aspect ratio)
        "-r", "30",                      # Frame rate: 30 FPS
        "-c:a", "aac",                   # Audio codec: AAC
        "-b:a", "128k",                  # Audio bitrate
        output_file                      # Output file
    ]

    try:
        # Run the FFmpeg command
        subprocess.run(command, check=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        print(f"Video converted successfully: {output_file}")
        return output_file
    except subprocess.CalledProcessError as e:
        print(f"Error converting video: {e.stderr.decode()}")
        return None

def convert_video_and_update_playlist(app, file_path, original_filename, target_type, target_id, duration):
    """
    Converts a video and updates the playlist database.
    """
    print(f"Starting video conversion for: {file_path}")
    
    # Use simple path resolution for containerized environment
    upload_folder = app.config['UPLOAD_FOLDER']
    print(f"Upload folder: {upload_folder}")
    
    converted_file = convert_video(file_path, upload_folder)
    if converted_file:
        converted_filename = os.path.basename(converted_file)
        print(f"Video converted successfully: {converted_filename}")

        # Use the application context to interact with the database
        with app.app_context():
            # Update the database with the converted filename
            if target_type == 'group':
                group = Group.query.get_or_404(target_id)
                for player in group.players:
                    content = Content.query.filter_by(player_id=player.id, file_name=original_filename).first()
                    if content:
                        content.file_name = converted_filename
            elif target_type == 'player':
                content = Content.query.filter_by(player_id=target_id, file_name=original_filename).first()
                if content:
                    content.file_name = converted_filename

            db.session.commit()
            print(f"Database updated with converted video: {converted_filename}")

        # Delete the original file only if it exists
        if os.path.exists(file_path):
            os.remove(file_path)
            print(f"Original file deleted: {file_path}")
    else:
        print(f"Video conversion failed for: {file_path}")

# 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):
    """
    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
        
    Returns:
        bool: True if successful, False otherwise
    """
    print(f"Processing PDF file: {input_file}")
    print(f"Output folder: {output_folder}")
    
    # 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 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")
        return success
    else:
        print("Failed to convert PDF to images")
        return False

def process_pptx(input_file, output_folder, duration, target_type, target_id):
    """
    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
        
    Returns:
        bool: True if successful, False otherwise
    """
    print(f"Processing PPTX file using PDF workflow: {input_file}")
    print(f"Output folder: {output_folder}")
    
    # 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")
            return False
            
        print(f"PPTX successfully converted to PDF: {pdf_file}")
        
        # 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")
            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}")
        
        # 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")
        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):
    """
    Process uploaded files based on media type and add them to playlists.
    
    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
    
    for file in files:
        try:
            # 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':
                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, add to playlist then start conversion in background
                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)
                        player.playlist_version += 1
                    group.playlist_version += 1
                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)
                    player.playlist_version += 1
                
                db.session.commit()
                # Start background conversion using absolute path
                import threading
                threading.Thread(target=convert_video_and_update_playlist, 
                                args=(app, file_path, filename, target_type, target_id, duration)).start()
                result['message'] = f"Video {filename} added to playlist and being processed"
                log_upload('video', filename, target_type, target_id)
                
            elif media_type == 'pdf':
                # For PDFs, convert to images and update playlist using absolute path
                success = process_pdf(file_path, upload_folder, 
                                    duration, target_type, target_id)
                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':
                # 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)
                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