import os
import tempfile
from typing import List, Union, Tuple, Optional
from modules.video_processor import is_video_file, process_video_upload, SUPPORTED_VIDEO_FORMATS

# Supported image formats
SUPPORTED_IMAGE_FORMATS = ['.jpg', '.jpeg', '.png', '.bmp', '.tiff', '.webp', '.gif']

def get_media_type(file_path: str) -> str:
    """
    Determine if a file is an image, video, or unsupported.
    
    Args:
        file_path: Path to the file
        
    Returns:
        'image', 'video', or 'unsupported'
    """
    if not file_path:
        return 'unsupported'
    
    _, ext = os.path.splitext(file_path.lower())
    
    if ext in SUPPORTED_IMAGE_FORMATS:
        return 'image'
    elif ext in SUPPORTED_VIDEO_FORMATS:
        return 'video'
    else:
        return 'unsupported'

def is_supported_media(file_path: str) -> bool:
    """Check if the file is a supported image or video format."""
    return get_media_type(file_path) in ['image', 'video']

def create_gallery_item(file_path: str) -> Optional[Tuple[str, str]]:
    """
    Create a gallery-compatible item from a media file path.
    
    Args:
        file_path: Path to the media file
        
    Returns:
        Tuple suitable for gallery (file_path, filename) or None if unsupported
    """
    if not os.path.exists(file_path):
        return None
    
    if not is_supported_media(file_path):
        return None
    
    filename = os.path.basename(file_path)
    return (file_path, filename)

def process_single_media_upload(file_path: str, max_video_duration: int = 30, frame_interval: int = 1) -> List[str]:
    """
    Process a single media file upload (image or video).
    
    Args:
        file_path: Path to the uploaded file
        max_video_duration: Maximum duration to process for videos (seconds)
        frame_interval: Interval between frames for videos (seconds)
        
    Returns:
        List of file paths to be added to gallery (images or extracted frames)
    """
    if not file_path or not os.path.exists(file_path):
        return []
    
    media_type = get_media_type(file_path)
    
    if media_type == 'image':
        # For images, just return the original path
        return [file_path]
    elif media_type == 'video':
        # For videos, extract frames
        frame_paths, _ = process_video_upload(file_path, max_video_duration, frame_interval)
        return frame_paths
    else:
        # Unsupported format
        return []

def process_multiple_media_uploads(
    file_paths: List[str], 
    max_video_duration: int = 30, 
    frame_interval: int = 1
) -> List[str]:
    """
    Process multiple media file uploads.
    
    Args:
        file_paths: List of paths to uploaded files
        max_video_duration: Maximum duration to process for videos (seconds)
        frame_interval: Interval between frames for videos (seconds)
        
    Returns:
        List of file paths to be added to gallery (images and extracted frames)
    """
    all_paths = []
    
    for file_path in file_paths:
        processed_paths = process_single_media_upload(file_path, max_video_duration, frame_interval)
        all_paths.extend(processed_paths)
    
    return all_paths

def handle_single_media_upload(file_path: str, gallery: List, max_video_duration: int = 30, frame_interval: int = 1) -> Tuple[List, Optional[str]]:
    """
    Handle a single media file upload and update gallery.
    
    Args:
        file_path: Path to the uploaded file
        gallery: Current gallery list
        max_video_duration: Maximum duration to process for videos (seconds)
        frame_interval: Interval between frames for videos (seconds)
        
    Returns:
        Tuple of (updated_gallery, None) for Gradio compatibility
    """
    if gallery is None:
        gallery = []
    
    if not file_path:
        return gallery, None
    
    # Process the media file
    processed_paths = process_single_media_upload(file_path, max_video_duration, frame_interval)
    
    # Create gallery items and add to gallery
    for path in processed_paths:
        gallery_item = create_gallery_item(path)
        if gallery_item:
            gallery.append(gallery_item)
    
    return gallery, None

def handle_multiple_media_uploads(
    file_paths: List, 
    gallery: List, 
    max_video_duration: int = 30, 
    frame_interval: int = 1
) -> List:
    """
    Handle multiple media file uploads and update gallery.
    
    Args:
        file_paths: List of uploaded file paths
        gallery: Current gallery list
        max_video_duration: Maximum duration to process for videos (seconds)
        frame_interval: Interval between frames for videos (seconds)
        
    Returns:
        Updated gallery list
    """
    if gallery is None:
        gallery = []
    
    if not file_paths:
        return gallery
    
    # Process all media files
    processed_paths = process_multiple_media_uploads(file_paths, max_video_duration, frame_interval)
    
    # Create gallery items and add to gallery
    for path in processed_paths:
        gallery_item = create_gallery_item(path)
        if gallery_item:
            gallery.append(gallery_item)
    
    return gallery

def get_supported_formats() -> dict:
    """Get dictionary of supported file formats."""
    return {
        'images': SUPPORTED_IMAGE_FORMATS,
        'videos': SUPPORTED_VIDEO_FORMATS,
        'all': SUPPORTED_IMAGE_FORMATS + SUPPORTED_VIDEO_FORMATS
    }

def validate_media_files(file_paths: List[str]) -> Tuple[List[str], List[str]]:
    """
    Validate a list of media files.
    
    Args:
        file_paths: List of file paths to validate
        
    Returns:
        Tuple of (valid_files, invalid_files)
    """
    valid_files = []
    invalid_files = []
    
    for file_path in file_paths:
        if is_supported_media(file_path):
            valid_files.append(file_path)
        else:
            invalid_files.append(file_path)
    
    return valid_files, invalid_files

# Export functions
__all__ = [
    'get_media_type',
    'is_supported_media',
    'create_gallery_item',
    'process_single_media_upload',
    'process_multiple_media_uploads',
    'handle_single_media_upload',
    'handle_multiple_media_uploads',
    'get_supported_formats',
    'validate_media_files',
    'SUPPORTED_IMAGE_FORMATS'
]