"""
Screenshot Storage Manager
Handles persistent storage, retrieval, and cleanup of screenshots
"""

import os
import json
import logging
from pathlib import Path
from datetime import datetime, timedelta
from typing import Dict, List, Optional, Tuple
from PIL import Image
import shutil


class ScreenshotStorage:
    """Manages persistent storage of screenshots with metadata and cleanup"""
    
    def __init__(self, base_dir: str = "data/screenshots"):
        """
        Initialize storage manager
        
        Args:
            base_dir: Base directory for storing screenshots
        """
        self.base_dir = Path(base_dir)
        self.base_dir.mkdir(parents=True, exist_ok=True)
        
        self.metadata_dir = self.base_dir / "metadata"
        self.metadata_dir.mkdir(exist_ok=True)
        
        self.logger = logging.getLogger(__name__)
        self.logger.info(f"✅ Screenshot storage initialized at {self.base_dir}")
    
    def save_screenshot(
        self,
        image: Image.Image,
        execution_id: str,
        viewport: str,
        screenshot_type: str,
        metadata: Optional[Dict] = None
    ) -> str:
        """
        Save screenshot with metadata
        
        Args:
            image: PIL Image object
            execution_id: Unique execution identifier
            viewport: Viewport name (desktop, mobile, etc.)
            screenshot_type: Type of screenshot (figma, website, annotated, comparison)
            metadata: Optional metadata dictionary
        
        Returns:
            Path to saved screenshot
        """
        try:
            # Create execution directory
            exec_dir = self.base_dir / execution_id
            exec_dir.mkdir(exist_ok=True)
            
            # Generate filename with timestamp
            timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
            filename = f"{viewport}_{screenshot_type}_{timestamp}.png"
            filepath = exec_dir / filename
            
            # Save image
            image.save(filepath, "PNG")
            self.logger.info(f"✅ Saved screenshot: {filepath}")
            
            # Save metadata
            if metadata is None:
                metadata = {}
            
            metadata.update({
                "execution_id": execution_id,
                "viewport": viewport,
                "screenshot_type": screenshot_type,
                "timestamp": timestamp,
                "filepath": str(filepath),
                "file_size": filepath.stat().st_size,
                "image_size": image.size
            })
            
            self._save_metadata(execution_id, viewport, screenshot_type, metadata)
            
            return str(filepath)
        
        except Exception as e:
            self.logger.error(f"❌ Error saving screenshot: {str(e)}")
            raise
    
    def _save_metadata(
        self,
        execution_id: str,
        viewport: str,
        screenshot_type: str,
        metadata: Dict
    ):
        """Save metadata for screenshot"""
        try:
            metadata_file = self.metadata_dir / f"{execution_id}_{viewport}_{screenshot_type}.json"
            
            with open(metadata_file, 'w') as f:
                json.dump(metadata, f, indent=2, default=str)
            
            self.logger.debug(f"✅ Saved metadata: {metadata_file}")
        
        except Exception as e:
            self.logger.error(f"❌ Error saving metadata: {str(e)}")
    
    def get_screenshot(
        self,
        execution_id: str,
        viewport: str,
        screenshot_type: str
    ) -> Optional[Image.Image]:
        """
        Retrieve screenshot
        
        Args:
            execution_id: Execution identifier
            viewport: Viewport name
            screenshot_type: Type of screenshot
        
        Returns:
            PIL Image object or None if not found
        """
        try:
            exec_dir = self.base_dir / execution_id
            
            # Find the most recent matching screenshot
            pattern = f"{viewport}_{screenshot_type}_*.png"
            matching_files = list(exec_dir.glob(pattern))
            
            if not matching_files:
                self.logger.warning(f"⚠️  No screenshots found for {execution_id}/{viewport}/{screenshot_type}")
                return None
            
            # Get most recent
            latest_file = max(matching_files, key=lambda p: p.stat().st_mtime)
            image = Image.open(latest_file)
            
            self.logger.info(f"✅ Retrieved screenshot: {latest_file}")
            return image
        
        except Exception as e:
            self.logger.error(f"❌ Error retrieving screenshot: {str(e)}")
            return None
    
    def get_execution_screenshots(self, execution_id: str) -> Dict[str, List[str]]:
        """
        Get all screenshots for an execution
        
        Args:
            execution_id: Execution identifier
        
        Returns:
            Dictionary mapping screenshot types to file paths
        """
        try:
            exec_dir = self.base_dir / execution_id
            
            if not exec_dir.exists():
                self.logger.warning(f"⚠️  Execution directory not found: {execution_id}")
                return {}
            
            screenshots = {}
            for file in sorted(exec_dir.glob("*.png")):
                # Parse filename: viewport_type_timestamp.png
                parts = file.stem.split("_")
                if len(parts) >= 2:
                    screenshot_type = parts[1]
                    if screenshot_type not in screenshots:
                        screenshots[screenshot_type] = []
                    screenshots[screenshot_type].append(str(file))
            
            self.logger.info(f"✅ Retrieved {sum(len(v) for v in screenshots.values())} screenshots for {execution_id}")
            return screenshots
        
        except Exception as e:
            self.logger.error(f"❌ Error retrieving execution screenshots: {str(e)}")
            return {}
    
    def get_execution_metadata(self, execution_id: str) -> Dict[str, Dict]:
        """
        Get all metadata for an execution
        
        Args:
            execution_id: Execution identifier
        
        Returns:
            Dictionary of metadata
        """
        try:
            metadata = {}
            pattern = f"{execution_id}_*.json"
            
            for metadata_file in self.metadata_dir.glob(pattern):
                with open(metadata_file, 'r') as f:
                    data = json.load(f)
                    key = metadata_file.stem
                    metadata[key] = data
            
            self.logger.info(f"✅ Retrieved metadata for {execution_id}")
            return metadata
        
        except Exception as e:
            self.logger.error(f"❌ Error retrieving metadata: {str(e)}")
            return {}
    
    def cleanup_old_screenshots(self, days: int = 7) -> Tuple[int, int]:
        """
        Remove screenshots older than N days
        
        Args:
            days: Number of days to keep
        
        Returns:
            Tuple of (deleted_files, freed_space_mb)
        """
        try:
            cutoff = datetime.now() - timedelta(days=days)
            deleted_count = 0
            freed_space = 0
            
            for exec_dir in self.base_dir.iterdir():
                if not exec_dir.is_dir() or exec_dir.name == "metadata":
                    continue
                
                for screenshot in exec_dir.glob("*.png"):
                    mtime = datetime.fromtimestamp(screenshot.stat().st_mtime)
                    
                    if mtime < cutoff:
                        file_size = screenshot.stat().st_size
                        screenshot.unlink()
                        deleted_count += 1
                        freed_space += file_size
                        self.logger.info(f"🗑️  Deleted old screenshot: {screenshot}")
                
                # Remove empty execution directories
                if not list(exec_dir.glob("*.png")):
                    exec_dir.rmdir()
                    self.logger.info(f"🗑️  Removed empty directory: {exec_dir}")
            
            freed_space_mb = freed_space / (1024 * 1024)
            self.logger.info(f"✅ Cleanup complete: {deleted_count} files deleted, {freed_space_mb:.2f}MB freed")
            
            return deleted_count, freed_space_mb
        
        except Exception as e:
            self.logger.error(f"❌ Error during cleanup: {str(e)}")
            return 0, 0
    
    def get_storage_stats(self) -> Dict[str, any]:
        """
        Get storage statistics
        
        Returns:
            Dictionary with storage stats
        """
        try:
            total_size = 0
            total_files = 0
            executions = {}
            
            for exec_dir in self.base_dir.iterdir():
                if not exec_dir.is_dir() or exec_dir.name == "metadata":
                    continue
                
                exec_size = 0
                exec_files = 0
                
                for screenshot in exec_dir.glob("*.png"):
                    file_size = screenshot.stat().st_size
                    exec_size += file_size
                    exec_files += 1
                    total_size += file_size
                    total_files += 1
                
                executions[exec_dir.name] = {
                    "files": exec_files,
                    "size_mb": exec_size / (1024 * 1024)
                }
            
            return {
                "total_files": total_files,
                "total_size_mb": total_size / (1024 * 1024),
                "executions": executions,
                "base_dir": str(self.base_dir)
            }
        
        except Exception as e:
            self.logger.error(f"❌ Error getting storage stats: {str(e)}")
            return {}
    
    def export_execution(self, execution_id: str, export_path: str) -> bool:
        """
        Export all screenshots and metadata for an execution
        
        Args:
            execution_id: Execution identifier
            export_path: Path to export to
        
        Returns:
            True if successful
        """
        try:
            export_dir = Path(export_path) / execution_id
            export_dir.mkdir(parents=True, exist_ok=True)
            
            # Copy screenshots
            exec_dir = self.base_dir / execution_id
            if exec_dir.exists():
                for screenshot in exec_dir.glob("*.png"):
                    shutil.copy2(screenshot, export_dir / screenshot.name)
            
            # Copy metadata
            metadata = self.get_execution_metadata(execution_id)
            metadata_export = export_dir / "metadata.json"
            with open(metadata_export, 'w') as f:
                json.dump(metadata, f, indent=2, default=str)
            
            self.logger.info(f"✅ Exported execution {execution_id} to {export_dir}")
            return True
        
        except Exception as e:
            self.logger.error(f"❌ Error exporting execution: {str(e)}")
            return False
    
    def delete_execution(self, execution_id: str) -> bool:
        """
        Delete all screenshots and metadata for an execution
        
        Args:
            execution_id: Execution identifier
        
        Returns:
            True if successful
        """
        try:
            exec_dir = self.base_dir / execution_id
            
            if exec_dir.exists():
                shutil.rmtree(exec_dir)
                self.logger.info(f"🗑️  Deleted execution directory: {exec_dir}")
            
            # Delete metadata files
            pattern = f"{execution_id}_*.json"
            for metadata_file in self.metadata_dir.glob(pattern):
                metadata_file.unlink()
                self.logger.info(f"🗑️  Deleted metadata: {metadata_file}")
            
            self.logger.info(f"✅ Deleted execution {execution_id}")
            return True
        
        except Exception as e:
            self.logger.error(f"❌ Error deleting execution: {str(e)}")
            return False
    
    def list_executions(self) -> List[Dict[str, any]]:
        """
        List all stored executions
        
        Returns:
            List of execution info dictionaries
        """
        try:
            executions = []
            
            for exec_dir in sorted(self.base_dir.iterdir(), reverse=True):
                if not exec_dir.is_dir() or exec_dir.name == "metadata":
                    continue
                
                screenshots = list(exec_dir.glob("*.png"))
                if screenshots:
                    # Get creation time from directory
                    mtime = datetime.fromtimestamp(exec_dir.stat().st_mtime)
                    
                    executions.append({
                        "execution_id": exec_dir.name,
                        "timestamp": mtime.isoformat(),
                        "screenshot_count": len(screenshots),
                        "size_mb": sum(f.stat().st_size for f in screenshots) / (1024 * 1024)
                    })
            
            return executions
        
        except Exception as e:
            self.logger.error(f"❌ Error listing executions: {str(e)}")
            return []


# Convenience functions

def get_storage_manager(base_dir: str = "data/screenshots") -> ScreenshotStorage:
    """Get or create storage manager instance"""
    return ScreenshotStorage(base_dir)


def cleanup_storage(base_dir: str = "data/screenshots", days: int = 7):
    """Cleanup old screenshots"""
    storage = ScreenshotStorage(base_dir)
    return storage.cleanup_old_screenshots(days)


def get_storage_stats(base_dir: str = "data/screenshots") -> Dict:
    """Get storage statistics"""
    storage = ScreenshotStorage(base_dir)
    return storage.get_storage_stats()