"""Authentication API endpoints."""
from __future__ import annotations

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.exc import IntegrityError

from app.api.deps import get_auth_service, get_user_repository
from app.core.security import password_hasher
from app.models.organization import Organization
from app.models.organization_member import OrganizationMember, OrganizationRole
from app.models.token import LoginRequest, TokenResponse
from app.models.user import UserCreate
from app.repositories.user_repo import UserRepository
from app.services.auth_service import AuthService, InvalidCredentialsError

from .models import RegisterRequest

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


@router.post("/register", response_model=TokenResponse, status_code=status.HTTP_201_CREATED)
async def register_user(
    payload: RegisterRequest,
    repo: UserRepository = Depends(get_user_repository),
    auth_service: AuthService = Depends(get_auth_service),
) -> TokenResponse:
    """Register a new owner along with the first organization and return JWT."""

    existing = await repo.get_by_email(payload.email)
    if existing is not None:
        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail="User already exists")

    organization = Organization(name=payload.organization_name)
    repo.session.add(organization)
    await repo.session.flush()

    user_data = UserCreate(email=payload.email, password=payload.password, name=payload.name)
    hashed_password = password_hasher.hash(payload.password)

    try:
        user = await repo.create(data=user_data, hashed_password=hashed_password)
        membership = OrganizationMember(
            organization_id=organization.id,
            user_id=user.id,
            role=OrganizationRole.OWNER,
        )
        repo.session.add(membership)
        await repo.session.commit()
    except IntegrityError as exc:
        await repo.session.rollback()
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Organization or user already exists",
        ) from exc

    await repo.session.refresh(user)
    return auth_service.create_access_token(user)


@router.post("/login", response_model=TokenResponse)
async def login(
    credentials: LoginRequest,
    service: AuthService = Depends(get_auth_service),
) -> TokenResponse:
    """Authenticate user credentials and issue a JWT."""
    try:
        user = await service.authenticate(credentials.email, credentials.password)
    except InvalidCredentialsError as exc:  # pragma: no cover - thin API
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail=str(exc)) from exc
    return service.create_access_token(user)


@router.post("/token", response_model=TokenResponse)
async def login_for_access_token(
    credentials: LoginRequest,
    service: AuthService = Depends(get_auth_service),
) -> TokenResponse:
    try:
        user = await service.authenticate(credentials.email, credentials.password)
    except InvalidCredentialsError as exc:  # pragma: no cover - thin API
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail=str(exc)) from exc
    return service.create_access_token(user)