import { json } from '@sveltejs/kit';
import type { RequestHandler } from './$types';
import { requireAuth } from '$lib/server/middleware/authenticate.js';
import * as notificationService from '$lib/server/services/notificationService.js';
import { updateNotificationChannelSchema } from '$lib/utils/validators.js';
import { success, error } from '$lib/server/utils/response.js';

/**
 * GET /api/notifications/channels/:id — Get a single notification channel.
 */
export const GET: RequestHandler = async (event) => {
	const user = requireAuth(event);
	const { id } = event.params;

	try {
		const channel = await notificationService.getChannelById(id, user.id);
		return json(success(channel));
	} catch (err) {
		const message = err instanceof Error ? err.message : 'Channel not found';
		return json(error(message), { status: 404 });
	}
};

/**
 * PATCH /api/notifications/channels/:id — Update a notification channel.
 */
export const PATCH: RequestHandler = async (event) => {
	const user = requireAuth(event);
	const { id } = event.params;

	let body: unknown;
	try {
		body = await event.request.json();
	} catch {
		return json(error('Invalid JSON body'), { status: 400 });
	}

	const parsed = updateNotificationChannelSchema.safeParse(body);
	if (!parsed.success) {
		const messages = parsed.error.errors.map((e) => e.message).join(', ');
		return json(error(messages), { status: 400 });
	}

	try {
		const channel = await notificationService.updateChannel(id, user.id, parsed.data);
		return json(success(channel));
	} catch (err) {
		const message = err instanceof Error ? err.message : 'Failed to update channel';
		const status = message.includes('not found') ? 404 : 500;
		return json(error(message), { status });
	}
};

/**
 * DELETE /api/notifications/channels/:id — Delete a notification channel.
 */
export const DELETE: RequestHandler = async (event) => {
	const user = requireAuth(event);
	const { id } = event.params;

	try {
		await notificationService.deleteChannel(id, user.id);
		return json(success(null));
	} catch (err) {
		const message = err instanceof Error ? err.message : 'Failed to delete channel';
		const status = message.includes('not found') ? 404 : 500;
		return json(error(message), { status });
	}
};