"""Map service for business logic."""
from typing import List, Optional
from uuid import UUID
from sqlalchemy.orm import Session
from fastapi import HTTPException, status

from app.models.map import Map
from app.models.user import User
from app.schemas.map import MapCreate, MapUpdate


def get_user_maps(db: Session, user_id: UUID) -> List[Map]:
    """Get all maps owned by a user."""
    return db.query(Map).filter(Map.owner_id == user_id).order_by(Map.updated_at.desc()).all()


def get_map_by_id(db: Session, map_id: UUID, user: Optional[User] = None) -> Map:
    """Get a map by ID with optional authorization check."""
    map_obj = db.query(Map).filter(Map.id == map_id).first()

    if not map_obj:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Map not found"
        )

    # If user is provided, check authorization
    if user:
        if map_obj.owner_id != user.id and not user.is_admin:
            raise HTTPException(
                status_code=status.HTTP_403_FORBIDDEN,
                detail="You don't have permission to access this map"
            )

    return map_obj


def get_default_public_map(db: Session) -> Optional[Map]:
    """Get the default public map (first map with is_default_public=True)."""
    return db.query(Map).filter(Map.is_default_public == True).first()


def create_map(db: Session, map_data: MapCreate, user_id: UUID) -> Map:
    """Create a new map."""
    map_obj = Map(
        name=map_data.name,
        description=map_data.description,
        owner_id=user_id,
        is_default_public=False
    )

    db.add(map_obj)
    db.commit()
    db.refresh(map_obj)

    return map_obj


def update_map(db: Session, map_id: UUID, map_data: MapUpdate, user: User) -> Map:
    """Update a map. Only owner or admin can update."""
    map_obj = get_map_by_id(db, map_id, user)

    # Update fields if provided
    if map_data.name is not None:
        map_obj.name = map_data.name
    if map_data.description is not None:
        map_obj.description = map_data.description

    db.commit()
    db.refresh(map_obj)

    return map_obj


def delete_map(db: Session, map_id: UUID, user: User) -> None:
    """Delete a map. Only owner or admin can delete."""
    map_obj = get_map_by_id(db, map_id, user)

    db.delete(map_obj)
    db.commit()


def set_default_public_map(db: Session, map_id: UUID, user: User) -> Map:
    """Set a map as the default public map. Only admins can do this."""
    if not user.is_admin:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Only administrators can set the default public map"
        )

    # Get the map (admin check is done in get_map_by_id)
    map_obj = get_map_by_id(db, map_id, user)

    # Unset any existing default public maps
    db.query(Map).filter(Map.is_default_public == True).update({"is_default_public": False})

    # Set this map as default public
    map_obj.is_default_public = True

    db.commit()
    db.refresh(map_obj)

    return map_obj