"""
Helper utilities for MixVideo V2
"""

import os
from pathlib import Path
from typing import Dict, Any, Union
import ffmpeg


def format_duration(seconds: float) -> str:
    """
    Format duration in seconds to human-readable string.
    
    Args:
        seconds: Duration in seconds
        
    Returns:
        Formatted duration string (e.g., "1:23:45")
    """
    hours = int(seconds // 3600)
    minutes = int((seconds % 3600) // 60)
    secs = int(seconds % 60)
    
    if hours > 0:
        return f"{hours}:{minutes:02d}:{secs:02d}"
    else:
        return f"{minutes}:{secs:02d}"


def get_file_info(file_path: Union[str, Path]) -> Dict[str, Any]:
    """
    Get basic file information.
    
    Args:
        file_path: Path to file
        
    Returns:
        Dictionary with file information
    """
    try:
        path = Path(file_path)
        
        if not path.exists():
            return {"error": "File not found"}
        
        stat = path.stat()
        
        info = {
            "name": path.name,
            "size": stat.st_size,
            "size_mb": round(stat.st_size / (1024 * 1024), 2),
            "modified": stat.st_mtime,
            "extension": path.suffix.lower(),
            "is_file": path.is_file(),
            "is_directory": path.is_dir()
        }
        
        # Try to get media info if it's a media file
        if path.suffix.lower() in ['.mp4', '.avi', '.mov', '.mkv', '.wmv', '.flv', '.mp3', '.wav', '.aac', '.flac', '.ogg']:
            try:
                probe = ffmpeg.probe(str(path))
                format_info = probe.get('format', {})
                
                info.update({
                    "duration": float(format_info.get('duration', 0)),
                    "duration_formatted": format_duration(float(format_info.get('duration', 0))),
                    "bitrate": int(format_info.get('bit_rate', 0)),
                    "format_name": format_info.get('format_name', ''),
                })
                
                # Video specific info
                video_streams = [s for s in probe.get('streams', []) if s.get('codec_type') == 'video']
                if video_streams:
                    video_stream = video_streams[0]
                    info.update({
                        "width": int(video_stream.get('width', 0)),
                        "height": int(video_stream.get('height', 0)),
                        "fps": eval(video_stream.get('r_frame_rate', '0/1')),
                        "video_codec": video_stream.get('codec_name', ''),
                    })
                
                # Audio specific info
                audio_streams = [s for s in probe.get('streams', []) if s.get('codec_type') == 'audio']
                if audio_streams:
                    audio_stream = audio_streams[0]
                    info.update({
                        "sample_rate": int(audio_stream.get('sample_rate', 0)),
                        "channels": int(audio_stream.get('channels', 0)),
                        "audio_codec": audio_stream.get('codec_name', ''),
                    })
                    
            except Exception as e:
                info["media_info_error"] = str(e)
        
        return info
        
    except Exception as e:
        return {"error": str(e)}


def ensure_directory(directory: Union[str, Path]) -> Path:
    """
    Ensure directory exists, create if it doesn't.
    
    Args:
        directory: Directory path
        
    Returns:
        Path object of the directory
    """
    path = Path(directory)
    path.mkdir(parents=True, exist_ok=True)
    return path


def get_unique_filename(file_path: Union[str, Path]) -> Path:
    """
    Get a unique filename by appending a number if file already exists.
    
    Args:
        file_path: Original file path
        
    Returns:
        Unique file path
    """
    path = Path(file_path)
    
    if not path.exists():
        return path
    
    counter = 1
    while True:
        stem = path.stem
        suffix = path.suffix
        parent = path.parent
        
        new_name = f"{stem}_{counter}{suffix}"
        new_path = parent / new_name
        
        if not new_path.exists():
            return new_path
        
        counter += 1


def format_file_size(size_bytes: int) -> str:
    """
    Format file size in bytes to human-readable string.
    
    Args:
        size_bytes: Size in bytes
        
    Returns:
        Formatted size string (e.g., "1.5 MB")
    """
    if size_bytes == 0:
        return "0 B"
    
    size_names = ["B", "KB", "MB", "GB", "TB"]
    i = 0
    size = float(size_bytes)
    
    while size >= 1024.0 and i < len(size_names) - 1:
        size /= 1024.0
        i += 1
    
    return f"{size:.1f} {size_names[i]}"


def clean_temp_files(temp_dir: Union[str, Path], max_age_hours: int = 24):
    """
    Clean old temporary files.
    
    Args:
        temp_dir: Temporary directory path
        max_age_hours: Maximum age of files to keep in hours
    """
    import time
    
    temp_path = Path(temp_dir)
    if not temp_path.exists():
        return
    
    current_time = time.time()
    max_age_seconds = max_age_hours * 3600
    
    for file_path in temp_path.rglob('*'):
        if file_path.is_file():
            file_age = current_time - file_path.stat().st_mtime
            if file_age > max_age_seconds:
                try:
                    file_path.unlink()
                except Exception:
                    pass  # Ignore errors when deleting files