from fastapi import APIRouter, Depends, HTTPException, Request, Response, status

from admin_app.api.dependencies import (
    get_auth_service,
    get_current_panel_staff_context,
    get_settings,
)
from admin_app.api.panel_session import (
    clear_panel_auth_cookies,
    get_panel_access_cookie,
    get_panel_refresh_cookie,
    set_panel_auth_cookies,
)
from admin_app.api.schemas import (
    AdminAuthenticatedStaffResponse,
    AdminLoginRequest,
    AdminPanelLogoutResponse,
    AdminPanelWebSessionResponse,
)
from admin_app.core import AdminAuthenticatedSession, AdminSettings, AuthenticatedStaffContext
from admin_app.services import AuthService

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


@router.post("/login", response_model=AdminPanelWebSessionResponse)
def panel_login(
    payload: AdminLoginRequest,
    request: Request,
    response: Response,
    settings: AdminSettings = Depends(get_settings),
    auth_service: AuthService = Depends(get_auth_service),
):
    ip_address, user_agent = _extract_request_metadata(request)
    session = auth_service.login(
        email=payload.email,
        password=payload.password,
        ip_address=ip_address,
        user_agent=user_agent,
    )
    if session is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Credenciais administrativas invalidas.",
        )

    set_panel_auth_cookies(response, session, settings)
    return _build_panel_session_response(
        session=session,
        message="Sessao administrativa web iniciada.",
        redirect_to=_build_prefixed_path(settings.admin_api_prefix, "/panel/admin"),
    )


@router.post("/refresh", response_model=AdminPanelWebSessionResponse)
def panel_refresh(
    request: Request,
    response: Response,
    settings: AdminSettings = Depends(get_settings),
    auth_service: AuthService = Depends(get_auth_service),
):
    refresh_token = get_panel_refresh_cookie(request)
    if not refresh_token:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Sessao administrativa web sem refresh token.",
        )

    ip_address, user_agent = _extract_request_metadata(request)
    session = auth_service.refresh_session(
        refresh_token=refresh_token,
        ip_address=ip_address,
        user_agent=user_agent,
    )
    if session is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Sessao administrativa web invalida para refresh.",
        )

    set_panel_auth_cookies(response, session, settings)
    return _build_panel_session_response(
        session=session,
        message="Sessao administrativa web renovada.",
    )


@router.get("/session", response_model=AdminPanelWebSessionResponse)
def panel_session(
    current_context: AuthenticatedStaffContext = Depends(get_current_panel_staff_context),
    settings: AdminSettings = Depends(get_settings),
):
    return AdminPanelWebSessionResponse(
        service="orquestrador-admin",
        status="ok",
        message="Sessao administrativa web ativa.",
        session_id=current_context.session_id,
        expires_in_seconds=settings.admin_auth_access_token_ttl_minutes * 60,
        staff_account=AdminAuthenticatedStaffResponse(**current_context.principal.model_dump()),
        redirect_to=None,
    )


@router.post("/logout", response_model=AdminPanelLogoutResponse)
def panel_logout(
    request: Request,
    response: Response,
    settings: AdminSettings = Depends(get_settings),
    auth_service: AuthService = Depends(get_auth_service),
):
    ip_address, user_agent = _extract_request_metadata(request)
    session_id: int | None = None

    access_token = get_panel_access_cookie(request)
    if access_token:
        try:
            current_context = auth_service.get_authenticated_context(access_token)
        except ValueError:
            current_context = None
        if current_context is not None:
            auth_service.logout(
                current_context.session_id,
                actor_staff_account_id=current_context.principal.id,
                ip_address=ip_address,
                user_agent=user_agent,
            )
            session_id = current_context.session_id

    refresh_token = get_panel_refresh_cookie(request)
    if session_id is None and refresh_token:
        session_id = auth_service.logout_by_refresh_token(
            refresh_token,
            ip_address=ip_address,
            user_agent=user_agent,
        )

    clear_panel_auth_cookies(response, settings)
    return AdminPanelLogoutResponse(
        service="orquestrador-admin",
        status="ok",
        message="Sessao administrativa web encerrada.",
        session_id=session_id,
        redirect_to=_build_prefixed_path(settings.admin_api_prefix, "/login"),
    )


def _build_panel_session_response(
    session: AdminAuthenticatedSession,
    *,
    message: str,
    redirect_to: str | None = None,
) -> AdminPanelWebSessionResponse:
    return AdminPanelWebSessionResponse(
        service="orquestrador-admin",
        status="ok",
        message=message,
        session_id=session.session_id,
        expires_in_seconds=session.expires_in_seconds,
        staff_account=AdminAuthenticatedStaffResponse(**session.principal.model_dump()),
        redirect_to=redirect_to,
    )


def _extract_request_metadata(request: Request) -> tuple[str | None, str | None]:
    ip_address = request.client.host if request.client else None
    user_agent = request.headers.get("user-agent")
    return ip_address, user_agent


def _build_prefixed_path(api_prefix: str, path: str) -> str:
    normalized_prefix = api_prefix.rstrip("/")
    normalized_path = path if path.startswith("/") else f"/{path}"
    if not normalized_prefix:
        return normalized_path
    if normalized_path == "/":
        return f"{normalized_prefix}/"
    return f"{normalized_prefix}{normalized_path}"