"""
Repo Service.

Business logic for repository management including:
- Creating repository records
- Listing repositories by server
- Retrieving repository details
- Updating repository status
- Deleting repository records
"""
import time
from typing import List, Optional
from pathlib import Path
from sqlalchemy.orm import Session

from app.models.repo import Repo
from app.models.server import Server
from app.config import get_settings


class RepoService:
    """
    Service for managing repository records.

    Handles CRUD operations for repositories that are being
    mirrored from Gitea servers.
    """

    def __init__(self, db: Session):
        """
        Initialize the service with a database session.

        Args:
            db: SQLAlchemy database session
        """
        self.db = db
        self.settings = get_settings()

    def create_repo(
        self,
        server_id: int,
        name: str,
        full_name: str,
        clone_url: str,
        local_path: Optional[str] = None
    ) -> Repo:
        """
        Create a new repository record.

        Args:
            server_id: ID of the server this repo belongs to
            name: Repository name (e.g., "my-repo")
            full_name: Full repository name (e.g., "owner/my-repo")
            clone_url: Git clone URL (typically SSH format)
            local_path: Optional local path for the mirrored repo.
                       If not provided, will be generated based on server and repo name.

        Returns:
            Created Repo model instance

        Raises:
            ValueError: If server_id is invalid
        """
        # Verify server exists
        server = self.db.query(Server).filter_by(id=server_id).first()
        if not server:
            raise ValueError(f"Server not found with ID {server_id}")

        # Generate local_path if not provided
        if local_path is None:
            local_path = str(Path(server.local_path) / name)

        # Create the repo record
        current_time = int(time.time())
        repo = Repo(
            server_id=server_id,
            name=name,
            full_name=full_name,
            clone_url=clone_url,
            local_path=local_path,
            status="pending",
            last_sync_at=None,
            created_at=current_time
        )

        self.db.add(repo)
        self.db.commit()
        self.db.refresh(repo)

        return repo

    def list_repos(self, server_id: int) -> List[Repo]:
        """
        List all repositories for a specific server.

        Args:
            server_id: ID of the server

        Returns:
            List of Repo model instances for the server, ordered by creation time
        """
        return self.db.query(Repo).filter_by(
            server_id=server_id
        ).order_by(Repo.created_at).all()

    def get_repo(self, repo_id: int) -> Optional[Repo]:
        """
        Get a repository by ID.

        Args:
            repo_id: ID of the repository

        Returns:
            Repo model instance or None if not found
        """
        return self.db.query(Repo).filter_by(id=repo_id).first()

    def update_repo_status(self, repo_id: int, status: str) -> Repo:
        """
        Update the status of a repository.

        Common status values:
        - "pending": Initial state, not yet synced
        - "syncing": Currently being synced
        - "success": Last sync was successful
        - "failed": Last sync failed

        Args:
            repo_id: ID of the repository
            status: New status value

        Returns:
            Updated Repo model instance

        Raises:
            ValueError: If repo not found
        """
        repo = self.get_repo(repo_id)
        if not repo:
            raise ValueError(f"Repo not found with ID {repo_id}")

        repo.status = status

        # If status is success, update last_sync_at
        if status == "success":
            repo.last_sync_at = int(time.time())

        self.db.commit()
        self.db.refresh(repo)

        return repo

    def delete_repo(self, repo_id: int) -> bool:
        """
        Delete a repository.

        Args:
            repo_id: ID of the repository to delete

        Returns:
            True if deleted, False if not found
        """
        repo = self.get_repo(repo_id)
        if not repo:
            return False

        self.db.delete(repo)
        self.db.commit()

        return True

    def get_repo_by_name(self, server_id: int, name: str) -> Optional[Repo]:
        """
        Get a repository by server and name.

        Args:
            server_id: ID of the server
            name: Repository name

        Returns:
            Repo model instance or None if not found
        """
        return self.db.query(Repo).filter_by(
            server_id=server_id,
            name=name
        ).first()

    def list_all_repos(self) -> List[Repo]:
        """
        List all repositories across all servers.

        Returns:
            List of all Repo model instances, ordered by creation time
        """
        return self.db.query(Repo).order_by(Repo.created_at).all()

    def update_repo(
        self,
        repo_id: int,
        **kwargs
    ) -> Repo:
        """
        Update a repository's configuration.

        Args:
            repo_id: ID of the repository to update
            **kwargs: Fields to update (name, full_name, clone_url, local_path, status)

        Returns:
            Updated Repo model instance

        Raises:
            ValueError: If repo not found
        """
        repo = self.get_repo(repo_id)
        if not repo:
            raise ValueError(f"Repo not found with ID {repo_id}")

        # Update fields
        for key, value in kwargs.items():
            if hasattr(repo, key):
                setattr(repo, key, value)

        self.db.commit()
        self.db.refresh(repo)

        return repo