import { fail } from '@sveltejs/kit';
import type { Actions, PageServerLoad } from './$types';
import {
	createTaxonomy,
	deleteTaxonomy,
	getTaxonomy,
	type TaxonomyKind
} from '#lib/server/content.js';
import { getMailConfig } from '#lib/server/config.js';
import {
	inviteUser,
	isRole,
	listOpenInvitations,
	listUsers,
	requireBarkeeper,
	revokeInvitation,
	setUserLocked,
	setUserRole,
	validEmail
} from '#lib/server/auth.js';

export const load: PageServerLoad = ({ locals }) => {
	requireBarkeeper(locals.user);
	return {
		taxonomy: getTaxonomy(),
		users: listUsers(),
		invitations: listOpenInvitations(),
		mailTransport: getMailConfig().transport
	};
};

function actionError(cause: unknown): string {
	const code = cause instanceof Error ? cause.message : '';
	if (code === 'USER_EXISTS') return 'Für diese E-Mail existiert bereits ein Konto.';
	if (code === 'SELF_LOCK') return 'Das eigene Konto kann nicht gesperrt werden.';
	if (code === 'LAST_BARKEEPER') return 'Mindestens ein aktiver Barkeeper muss erhalten bleiben.';
	if (code === 'NOT_FOUND') return 'Der Eintrag wurde nicht gefunden.';
	if (code === 'TAXONOMY_EXISTS') return 'Dieser Name ist bereits vorhanden.';
	if (code === 'TAXONOMY_IN_USE')
		return 'Verwendete oder für Vorlagen benötigte Einträge können nicht entfernt werden.';
	if (code === 'INVALID_COLOR') return 'Bitte eine gültige Farbe wählen.';
	if (code === 'INVALID_TAXONOMY') return 'Bitte einen gültigen Namen eingeben.';
	return 'Die Aktion konnte nicht ausgeführt werden.';
}

export const actions = {
	invite: async ({ locals, request }) => {
		const actor = requireBarkeeper(locals.user);
		const data = await request.formData();
		const email = String(data.get('email') || '').trim();
		const role = String(data.get('role') || '');
		if (!validEmail(email) || !isRole(role)) {
			return fail(400, { intent: 'invite', email, error: 'E-Mail und Rolle bitte prüfen.' });
		}
		try {
			const transport = await inviteUser(actor, email, role);
			return {
				intent: 'invite',
				success:
					transport === 'local'
						? 'Einladung wurde in der lokalen Mail-Outbox abgelegt.'
						: 'Einladung wurde versandt.'
			};
		} catch (cause) {
			return fail(400, { intent: 'invite', email, error: actionError(cause) });
		}
	},
	role: async ({ locals, request }) => {
		const actor = requireBarkeeper(locals.user);
		const data = await request.formData();
		const userId = String(data.get('userId') || '');
		const role = String(data.get('role') || '');
		if (!userId || !isRole(role)) return fail(400, { intent: 'role', error: 'Ungültige Rolle.' });
		try {
			setUserRole(actor, userId, role);
			return { intent: 'role', success: 'Rolle aktualisiert.' };
		} catch (cause) {
			return fail(400, { intent: 'role', error: actionError(cause) });
		}
	},
	lock: async ({ locals, request }) => {
		const actor = requireBarkeeper(locals.user);
		const data = await request.formData();
		try {
			setUserLocked(actor, String(data.get('userId') || ''), true);
			return { intent: 'lock', success: 'Konto gesperrt und bestehende Sitzungen beendet.' };
		} catch (cause) {
			return fail(400, { intent: 'lock', error: actionError(cause) });
		}
	},
	unlock: async ({ locals, request }) => {
		const actor = requireBarkeeper(locals.user);
		const data = await request.formData();
		try {
			setUserLocked(actor, String(data.get('userId') || ''), false);
			return { intent: 'unlock', success: 'Konto entsperrt.' };
		} catch (cause) {
			return fail(400, { intent: 'unlock', error: actionError(cause) });
		}
	},
	revokeInvitation: async ({ locals, request }) => {
		const actor = requireBarkeeper(locals.user);
		const data = await request.formData();
		revokeInvitation(actor, String(data.get('invitationId') || ''));
		return { intent: 'revokeInvitation', success: 'Einladung widerrufen.' };
	},
	createTaxonomy: async ({ locals, request }) => {
		requireBarkeeper(locals.user);
		const data = await request.formData();
		const kind = String(data.get('kind') || '') as TaxonomyKind;
		if (!['category', 'format', 'topic'].includes(kind)) {
			return fail(400, { intent: 'taxonomy', error: 'Ungültige Taxonomieart.' });
		}
		try {
			createTaxonomy(kind, String(data.get('name') || ''), String(data.get('color') || ''));
			return { intent: 'taxonomy', success: 'Eintrag angelegt.' };
		} catch (cause) {
			return fail(400, { intent: 'taxonomy', error: actionError(cause) });
		}
	},
	deleteTaxonomy: async ({ locals, request }) => {
		requireBarkeeper(locals.user);
		const data = await request.formData();
		const kind = String(data.get('kind') || '') as TaxonomyKind;
		if (!['category', 'format', 'topic'].includes(kind)) {
			return fail(400, { intent: 'taxonomy', error: 'Ungültige Taxonomieart.' });
		}
		try {
			deleteTaxonomy(kind, String(data.get('taxonomyId') || ''));
			return { intent: 'taxonomy', success: 'Eintrag entfernt.' };
		} catch (cause) {
			return fail(400, { intent: 'taxonomy', error: actionError(cause) });
		}
	}
} satisfies Actions;