use conduwuit_web::oidc::{
	oidc_consent_form,
	AuthorizationQuery,
	LoginError,
	LoginQuery,
	OidcRequest,
	OidcResponse,
};
use axum::extract::State;
use conduwuit::{
	Result,
	err,
	utils::hash::verify_password,
};
use ruma::user_id::UserId;

//#[axum::debug_handler]
/// # `POST /_matrix/client/unstable/org.matrix.msc2964/login`
///
/// Display a login UI to the user and return an authorization code on success.
/// We presume that the OAuth2 query parameters are provided in the form.
/// With the code, the client may then access stage two,
/// [super::authorize::authorize_consent].
pub(crate) async fn oidc_login(
	State(services): State<crate::State>,
	request: OidcRequest,
) -> Result<OidcResponse> {
	let query: LoginQuery = request.clone().try_into().map_err(|LoginError(err)|
		err!(Request(InvalidParam("Cannot process login form. {err}")))
	)?;
	// Only accept local usernames. Mostly to simplify things at first.
	let user_id = UserId::parse_with_server_name(
			query.username.clone(),
			&services.config.server_name
		)
		.map_err(|e| err!(Request(InvalidUsername("Username is invalid: {e}"))))?;

	if ! services.users.exists(&user_id).await {
		return Err(err!(Request(Unknown("unknown username"))));
	}
	tracing::info!("logging in: {user_id:?}");
	let valid_hash = services
		.users
		.password_hash(&user_id)
		.await
		.inspect_err(|e| tracing::info!("could not get user's hash: {e:?}"))?;

	if valid_hash.is_empty() {
		return Err(err!(Request(UserDeactivated("the user's hash was not found"))));
	}
	if let Err(_) = verify_password(&query.password, &valid_hash) {
		return Err(err!(Request(InvalidParam("password does not match"))));
	}
	tracing::info!("{user_id:?} passed, forwarding to consent page");

	let hostname = services
		.config
		.well_known
		.client
		.as_ref()
		.map(|s| s.domain().expect("well-known client should have a domain"));

	let hostname = hostname.unwrap_or("Continuwuity");
	let authorization_query: AuthorizationQuery = query.into();

	services
		.oidc
		.endpoint()
		.with_solicitor(oidc_consent_form(hostname, &authorization_query))
		.authorization_flow()
		.execute(request)
		.map_err(|err| err!(Request(Unknown("authorization failed: {err:?}"))))
}