import type { PageServerLoad } from './$types';
import { db } from '$lib/server/db';
import { applications, pets } from '$lib/server/schema';
import { eq, and, like, count, desc } from 'drizzle-orm';
import { hasPermission } from '$lib/roles';
import type { Role } from '$lib/roles';
import { error } from '@sveltejs/kit';

const PER_PAGE = 20;

export const load: PageServerLoad = async ({ url, locals }) => {
	if (!hasPermission(locals.user!.role as Role, 'applications')) error(403, 'Access denied');

	const q = url.searchParams.get('q')?.trim() ?? '';
	const type = url.searchParams.get('type') ?? '';
	const status = url.searchParams.get('status') ?? '';
	const page = Math.max(1, parseInt(url.searchParams.get('page') ?? '1', 10));
	const offset = (page - 1) * PER_PAGE;

	const conditions = [];
	if (q) conditions.push(like(applications.applicantName, `%${q}%`));
	if (type) conditions.push(eq(applications.type, type as typeof applications.type.enumValues[number]));
	if (status) conditions.push(eq(applications.status, status as typeof applications.status.enumValues[number]));

	const where = conditions.length > 0 ? and(...conditions) : undefined;

	const [totalRow] = await db.select({ total: count() }).from(applications).where(where);
	const total = totalRow?.total ?? 0;
	const totalPages = Math.max(1, Math.ceil(total / PER_PAGE));

	const rows = await db
		.select({
			id: applications.id,
			type: applications.type,
			petId: applications.petId,
			applicantName: applications.applicantName,
			email: applications.applicantEmail,
			phone: applications.applicantPhone,
			status: applications.status,
			createdAt: applications.createdAt,
			petName: pets.name
		})
		.from(applications)
		.leftJoin(pets, eq(applications.petId, pets.id))
		.where(where)
		.orderBy(desc(applications.createdAt))
		.limit(PER_PAGE)
		.offset(offset);

	return { applications: rows, total, page, totalPages, q, type, status };
};