"""HTTP routes for auth: register, login, logout, me, refresh."""

from fastapi import APIRouter, Cookie, HTTPException, Response, status
from pydantic import BaseModel
from starlette.requests import Request

from app.config import settings
from app.dependencies import (
    AuthServiceDep,
    ChildRepositoryDep,
    CurrentUserDep,
    PersonalDataRepositoryDep,
)
from app.rate_limit import limiter
from app.models.auth import LoginRequest, RegisterRequest, TokenResponse, UserMeResponse
from app.utils.errors import AuthError, ConflictError, UnauthorizedError

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

_REFRESH_COOKIE = "refresh_token"
_ACCESS_EXPIRES_IN = settings.jwt_access_token_expire_minutes * 60


@router.post("/register", response_model=TokenResponse, status_code=status.HTTP_201_CREATED)
@limiter.limit("10/minute")
async def register(
    request: Request, payload: RegisterRequest, response: Response, service: AuthServiceDep
) -> TokenResponse:
    try:
        user, _pd = await service.register(
            email=str(payload.email),
            password=payload.password,
            display_name=payload.display_name,
        )
    except ConflictError as exc:
        raise HTTPException(status.HTTP_409_CONFLICT, str(exc)) from exc

    access = service.create_access_token(user.id)
    refresh = service.create_refresh_token(user.id)
    _set_refresh_cookie(response, refresh)
    return TokenResponse(access_token=access, expires_in=_ACCESS_EXPIRES_IN)


@router.post("/login", response_model=TokenResponse)
@limiter.limit("10/minute")
async def login(
    request: Request, payload: LoginRequest, response: Response, service: AuthServiceDep
) -> TokenResponse:
    try:
        user = await service.login(str(payload.email), payload.password)
    except AuthError as exc:
        raise HTTPException(status.HTTP_401_UNAUTHORIZED, str(exc)) from exc

    access = service.create_access_token(user.id)
    refresh = service.create_refresh_token(user.id)
    _set_refresh_cookie(response, refresh)
    return TokenResponse(access_token=access, expires_in=_ACCESS_EXPIRES_IN)


@router.post("/logout", status_code=status.HTTP_204_NO_CONTENT)
async def logout(response: Response) -> None:
    response.delete_cookie(_REFRESH_COOKIE)


@router.post("/refresh", response_model=TokenResponse)
async def refresh(
    response: Response,
    service: AuthServiceDep,
    refresh_token: str | None = Cookie(default=None, alias=_REFRESH_COOKIE),
) -> TokenResponse:
    if not refresh_token:
        raise HTTPException(status.HTTP_401_UNAUTHORIZED, "No refresh token")
    try:
        access = await service.refresh_access_token(refresh_token)
    except UnauthorizedError as exc:
        raise HTTPException(status.HTTP_401_UNAUTHORIZED, str(exc)) from exc
    return TokenResponse(access_token=access, expires_in=_ACCESS_EXPIRES_IN)


@router.get("/me", response_model=UserMeResponse)
async def me(current_user: CurrentUserDep) -> UserMeResponse:
    # PersonalData is fetched separately when workspace context is needed.
    # Here we return just the user-level data.
    return UserMeResponse(
        id=str(current_user.id),
        email=current_user.email,
        display_name="",  # enriched by the frontend via workspace API
        workspace_id=None,  # client fetches via /api/workspace after login
    )


class _ChildContext(BaseModel):
    id: str
    name: str
    birth_date: str


class _UserContext(BaseModel):
    personal_data_uuid: str
    workspace_id: str
    parent_name: str
    children: list[_ChildContext]


@router.get("/context", response_model=_UserContext)
async def get_context(
    current_user: CurrentUserDep,
    pd_repo: PersonalDataRepositoryDep,
    child_repo: ChildRepositoryDep,
) -> _UserContext:
    """Return workspace + children for the current user. Used by the dev harness."""
    pd = await pd_repo.get_by_id(current_user.personal_data_uuid)
    if pd is None:
        raise HTTPException(status.HTTP_422_UNPROCESSABLE_ENTITY, "No parent profile found")
    children = await child_repo.list_by_workspace(pd.workspace_id)
    return _UserContext(
        personal_data_uuid=str(pd.uuid),
        workspace_id=str(pd.workspace_id),
        parent_name=pd.name,
        children=[
            _ChildContext(id=str(c.id), name=c.name, birth_date=str(c.birth_date)) for c in children
        ],
    )


def _set_refresh_cookie(response: Response, token: str) -> None:
    response.set_cookie(
        key=_REFRESH_COOKIE,
        value=token,
        httponly=True,
        secure=True,
        samesite="lax",
        max_age=settings.jwt_refresh_token_expire_days * 86400,
    )