from typing import Optional, List
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.user import User
from app.repositories.user import UserRepository
from app.core.security import get_password_hash, verify_password


class UserService:
    def __init__(self, db: AsyncSession):
        self.db = db
        self.repo = UserRepository(db)

    async def get_user(self, user_id: int) -> Optional[User]:
        return await self.repo.get_by_id(user_id)

    async def get_user_by_username(self, username: str) -> Optional[User]:
        return await self.repo.get_by_username(username)

    async def get_all_users(self) -> List[User]:
        return await self.repo.get_all()

    async def create_user(self, data: dict) -> User:
        if "password" in data:
            data["password_hash"] = get_password_hash(data.pop("password"))
        return await self.repo.create(data)

    async def update_user(self, user_id: int, data: dict) -> Optional[User]:
        if "password" in data:
            data["password_hash"] = get_password_hash(data.pop("password"))
        return await self.repo.update(user_id, data)

    async def delete_user(self, user_id: int) -> bool:
        return await self.repo.delete(user_id)

    async def authenticate(self, username: str, password: str) -> Optional[User]:
        user = await self.repo.get_by_username(username)
        if not user:
            return None
        if not verify_password(password, user.password_hash):
            return None
        if not user.is_active:
            return None
        return user

    async def change_password(self, user_id: int, old_password: str, new_password: str) -> bool:
        user = await self.repo.get_by_id(user_id)
        if not user:
            return False
        if not verify_password(old_password, user.password_hash):
            return False
        await self.repo.update(user_id, {"password_hash": get_password_hash(new_password)})
        return True

    async def reset_password(self, user_id: int, new_password: str) -> bool:
        user = await self.repo.get_by_id(user_id)
        if not user:
            return False
        await self.repo.update(user_id, {"password_hash": get_password_hash(new_password)})
        return True