"""
Storage Service
Handles file storage for uploaded and converted videos
"""

import json
import shutil
import uuid
from datetime import UTC, datetime
from pathlib import Path

from app.config import Settings, get_settings
from app.models.schemas import VideoMetadata, VideoStatus


class StorageService:
    """Manage video file storage."""

    def __init__(self, settings: Settings | None = None):
        self.settings = settings or get_settings()
        self.base_path = Path(self.settings.storage_path)
        self.uploads_path = self.base_path / "uploads"
        self.converted_path = self.base_path / "converted"

        # Ensure directories exist
        self.uploads_path.mkdir(parents=True, exist_ok=True)
        self.converted_path.mkdir(parents=True, exist_ok=True)

    def generate_video_id(self) -> str:
        """Generate unique video ID."""
        return str(uuid.uuid4())[:12]

    def get_upload_path(self, video_id: str, filename: str) -> Path:
        """Get path for uploaded video file."""
        video_dir = self.uploads_path / video_id
        video_dir.mkdir(parents=True, exist_ok=True)
        return video_dir / filename

    def get_converted_path(self, video_id: str) -> Path:
        """Get path for converted video directory."""
        video_dir = self.converted_path / video_id
        video_dir.mkdir(parents=True, exist_ok=True)
        return video_dir

    def get_hls_path(self, video_id: str) -> Path:
        """Get path for HLS output."""
        return self.get_converted_path(video_id) / "hls"

    def get_thumbnail_path(self, video_id: str) -> Path:
        """Get path for thumbnail."""
        return self.get_converted_path(video_id) / "thumbnail.jpg"

    def get_metadata_path(self, video_id: str) -> Path:
        """Get path for metadata JSON."""
        return self.get_converted_path(video_id) / "metadata.json"

    def save_metadata(
        self,
        video_id: str,
        kurs_id: int,
        title: str,
        status: VideoStatus,
        metadata: VideoMetadata | None = None,
        error_message: str | None = None,
    ) -> dict:
        """Save video metadata to JSON file."""
        meta_path = self.get_metadata_path(video_id)

        data = {
            "video_id": video_id,
            "kurs_id": kurs_id,
            "title": title,
            "status": status.value,
            "created_at": datetime.now(UTC).isoformat(),
            "updated_at": datetime.now(UTC).isoformat(),
            "error_message": error_message,
        }

        if metadata:
            data["metadata"] = metadata.model_dump()

        # Load existing data to preserve created_at
        if meta_path.exists():
            with meta_path.open() as f:
                existing = json.load(f)
                data["created_at"] = existing.get("created_at", data["created_at"])

        with meta_path.open("w") as f:
            json.dump(data, f, indent=2, default=str)

        return data

    def load_metadata(self, video_id: str) -> dict | None:
        """Load video metadata from JSON file."""
        meta_path = self.get_metadata_path(video_id)
        if not meta_path.exists():
            return None

        with meta_path.open() as f:
            return json.load(f)

    def update_status(
        self,
        video_id: str,
        status: VideoStatus,
        progress: int = 0,
        error_message: str | None = None,
    ) -> dict | None:
        """Update video status in metadata."""
        meta = self.load_metadata(video_id)
        if not meta:
            return None

        meta["status"] = status.value
        meta["progress"] = progress
        meta["updated_at"] = datetime.now(UTC).isoformat()
        if error_message:
            meta["error_message"] = error_message

        meta_path = self.get_metadata_path(video_id)
        with meta_path.open("w") as f:
            json.dump(meta, f, indent=2, default=str)

        return meta

    def delete_video(self, video_id: str) -> bool:
        """Delete all files for a video."""
        upload_dir = self.uploads_path / video_id
        converted_dir = self.converted_path / video_id

        deleted = False
        if upload_dir.exists():
            shutil.rmtree(upload_dir)
            deleted = True
        if converted_dir.exists():
            shutil.rmtree(converted_dir)
            deleted = True

        return deleted

    def get_video_ids(self) -> list[str]:
        """Get all video IDs."""
        ids = set()
        if self.uploads_path.exists():
            ids.update(d.name for d in self.uploads_path.iterdir() if d.is_dir())
        if self.converted_path.exists():
            ids.update(d.name for d in self.converted_path.iterdir() if d.is_dir())
        return sorted(ids)

    def is_writable(self) -> bool:
        """Check if storage is writable."""
        test_file = self.base_path / ".write_test"
        try:
            test_file.write_text("test")
            test_file.unlink()
            return True
        except (OSError, PermissionError):
            return False

    def get_disk_usage(self) -> dict:
        """Get disk usage statistics."""
        total, used, free = shutil.disk_usage(self.base_path)
        return {
            "total_gb": round(total / (1024**3), 2),
            "used_gb": round(used / (1024**3), 2),
            "free_gb": round(free / (1024**3), 2),
            "percent_used": round((used / total) * 100, 1),
        }