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# Source code for mindroot.coreplugins.admin.asset_manager

    import hashlib
    import shutil
    from pathlib import Path
    from typing import Dict, Optional, Tuple
    import json
    import os

    class AssetManager:
        """Manages deduplicated asset storage for personas"""

        def __init__(self, base_dir: str = "registry_assets"):
            self.base_dir = Path(base_dir)
            self.assets_dir = self.base_dir / "assets"
            self.metadata_dir = self.base_dir / "metadata"

            # Create directories
            self.assets_dir.mkdir(parents=True, exist_ok=True)
            self.metadata_dir.mkdir(parents=True, exist_ok=True)

        def calculate_file_hash(self, file_path: Path) -> str:
            """Calculate SHA256 hash of a file"""
            sha256_hash = hashlib.sha256()
            with open(file_path, "rb") as f:
                for chunk in iter(lambda: f.read(4096), b""):
                    sha256_hash.update(chunk)
            return sha256_hash.hexdigest()

        def calculate_content_hash(self, content: bytes) -> str:
            """Calculate SHA256 hash of content bytes"""
            return hashlib.sha256(content).hexdigest()

        def store_asset(self, source_path: Path, asset_type: str = "image") -> Tuple[str, bool]:
            """Store an asset and return (hash, was_new)"""
            if not source_path.exists():
                raise FileNotFoundError(f"Source file not found: {source_path}")

            # Calculate hash
            file_hash = self.calculate_file_hash(source_path)
            asset_path = self.assets_dir / file_hash

            # Check if asset already exists
            if asset_path.exists():
                # Update reference count
                self._increment_reference_count(file_hash)
                return file_hash, False

            # Copy file to assets directory
            shutil.copy2(source_path, asset_path)

            # Create metadata
            metadata = {
                "hash": file_hash,
                "type": asset_type,
                "size": source_path.stat().st_size,
                "original_name": source_path.name,
                "reference_count": 1
            }

            metadata_path = self.metadata_dir / f"{file_hash}.json"
            with open(metadata_path, 'w') as f:
                json.dump(metadata, f, indent=2)

            return file_hash, True

        def store_content(self, content: bytes, filename: str, asset_type: str = "image") -> Tuple[str, bool]:
            """Store content bytes and return (hash, was_new)"""
            file_hash = self.calculate_content_hash(content)
            asset_path = self.assets_dir / file_hash

            # Check if asset already exists
            if asset_path.exists():
                self._increment_reference_count(file_hash)
                return file_hash, False

            # Write content to assets directory
            with open(asset_path, 'wb') as f:
                f.write(content)

            # Create metadata
            metadata = {
                "hash": file_hash,
                "type": asset_type,
                "size": len(content),
                "original_name": filename,
                "reference_count": 1
            }

            metadata_path = self.metadata_dir / f"{file_hash}.json"
            with open(metadata_path, 'w') as f:
                json.dump(metadata, f, indent=2)

            return file_hash, True

        def get_asset_path(self, file_hash: str) -> Optional[Path]:
            """Get the path to an asset by hash"""
            asset_path = self.assets_dir / file_hash
            return asset_path if asset_path.exists() else None

        def get_asset_metadata(self, file_hash: str) -> Optional[Dict]:
            """Get metadata for an asset"""
            metadata_path = self.metadata_dir / f"{file_hash}.json"
            if not metadata_path.exists():
                return None

            with open(metadata_path, 'r') as f:
                return json.load(f)

        def _increment_reference_count(self, file_hash: str):
            """Increment reference count for an asset"""
            metadata = self.get_asset_metadata(file_hash)
            if metadata:
                metadata['reference_count'] += 1
                metadata_path = self.metadata_dir / f"{file_hash}.json"
                with open(metadata_path, 'w') as f:
                    json.dump(metadata, f, indent=2)

        def decrement_reference_count(self, file_hash: str) -> bool:
            """Decrement reference count and delete if zero. Returns True if deleted."""
            metadata = self.get_asset_metadata(file_hash)
            if not metadata:
                return False

            metadata['reference_count'] -= 1

            if metadata['reference_count'] <= 0:
                # Delete asset and metadata
                asset_path = self.assets_dir / file_hash
                metadata_path = self.metadata_dir / f"{file_hash}.json"

                if asset_path.exists():
                    asset_path.unlink()
                if metadata_path.exists():
                    metadata_path.unlink()

                return True
            else:
                # Update metadata
                metadata_path = self.metadata_dir / f"{file_hash}.json"
                with open(metadata_path, 'w') as f:
                    json.dump(metadata, f, indent=2)

                return False

        def get_stats(self) -> Dict:
            """Get storage statistics"""
            total_assets = len(list(self.assets_dir.glob('*')))
            total_size = sum(f.stat().st_size for f in self.assets_dir.glob('*'))

            # Calculate total references
            total_references = 0
            for metadata_file in self.metadata_dir.glob('*.json'):
                with open(metadata_file, 'r') as f:
                    metadata = json.load(f)
                    total_references += metadata.get('reference_count', 0)

            return {
                'total_assets': total_assets,
                'total_size_bytes': total_size,
                'total_references': total_references,
                'deduplication_ratio': total_references / max(total_assets, 1)
            }

    # Global asset manager instance
    asset_manager = AssetManager()