"""Authentication API routes."""
from fastapi import APIRouter, HTTPException, status

from app.api.dependencies import AuthServiceDep, CurrentUser, DBSession
from app.schemas.auth import (
    LoginRequest,
    RefreshTokenRequest,
    Token,
    UserCreate,
    UserResponse,
    UserUpdate,
)
from app.services.auth_service import AuthService

router = APIRouter(prefix="/auth", tags=["authentication"])


@router.post("/register", response_model=UserResponse, status_code=status.HTTP_201_CREATED)
async def register(
    user_data: UserCreate,
    auth_service: AuthServiceDep,
):
    """
    Register a new user.

    - **email**: Valid email address
    - **username**: 3-50 characters, unique
    - **password**: Min 8 characters
    - **display_name**: Optional display name
    """
    try:
        user = await auth_service.register(
            email=user_data.email,
            username=user_data.username,
            password=user_data.password,
            display_name=user_data.display_name,
        )
        return UserResponse.model_validate(user)
    except ValueError as e:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(e),
        )


@router.post("/login", response_model=Token)
async def login(
    credentials: LoginRequest,
    auth_service: AuthServiceDep,
):
    """
    Login with email and password.

    Returns access and refresh tokens.
    """
    try:
        user = await auth_service.login(
            email=credentials.email,
            password=credentials.password,
        )
        access_token, refresh_token = auth_service.create_tokens(user.id)

        return Token(
            access_token=access_token,
            refresh_token=refresh_token,
            expires_in=15 * 60,  # 15 minutes
        )
    except ValueError as e:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail=str(e),
            headers={"WWW-Authenticate": "Bearer"},
        )


@router.post("/refresh", response_model=Token)
async def refresh_token(
    token_data: RefreshTokenRequest,
    auth_service: AuthServiceDep,
):
    """
    Refresh access token using refresh token.

    Returns new access and refresh tokens.
    """
    from app.core.security import decode_token

    try:
        payload = decode_token(token_data.refresh_token)
        user_id = payload.get("sub")
        token_type = payload.get("type")

        if user_id is None or token_type != "refresh":
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail="Invalid refresh token",
            )

        # Verify user still exists
        user = await auth_service.get_user_by_id(user_id)
        if user is None:
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail="User not found",
            )

        # Create new tokens
        access_token, refresh_token = auth_service.create_tokens(user.id)

        return Token(
            access_token=access_token,
            refresh_token=refresh_token,
            expires_in=15 * 60,
        )
    except Exception:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid refresh token",
        )


@router.get("/me", response_model=UserResponse)
async def get_current_user(
    current_user: CurrentUser,
):
    """
    Get current authenticated user profile.

    Requires authentication.
    """
    return UserResponse.model_validate(current_user)


@router.put("/me", response_model=UserResponse)
async def update_current_user(
    user_data: UserUpdate,
    current_user: CurrentUser,
    auth_service: AuthServiceDep,
):
    """
    Update current user profile.

    Requires authentication.
    """
    try:
        updated_user = await auth_service.update_user(
            user_id=current_user.id,
            display_name=user_data.display_name,
            avatar_url=user_data.avatar_url,
            date_of_birth=user_data.date_of_birth,
            country=user_data.country,
        )
        return UserResponse.model_validate(updated_user)
    except ValueError as e:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=str(e),
        )


@router.post("/logout", status_code=status.HTTP_204_NO_CONTENT)
async def logout(
    current_user: CurrentUser,
):
    """
    Logout current user.

    In a stateless JWT setup, this is mainly for client-side cleanup.
    The token will expire automatically.

    Requires authentication.
    """
    # In production, you might want to:
    # - Add token to blacklist (Redis)
    # - Remove refresh token from database
    # - Log the logout event

    return None