import { redirect } from "next/navigation";
import { getTranslations } from "next-intl/server";
import { StatusCard } from "@/components/admin/dashboard";
import type { Prisma } from "@/generated/prisma/client";
import { calcPagination, parseListParams } from "@/lib/admin-helpers";
import { formatDate } from "@/lib/format-date";
import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
import { prisma } from "@/lib/prisma";
import { type HelpTicketRow, HelpTicketsTable } from "./help-tickets-table";

export const dynamic = "force-dynamic";

export default async function AdminHelpTicketsPage({
	searchParams,
}: {
	searchParams: Promise<Record<string, string>>;
}) {
	const { session, permissions } = await getAdminContext();
	if (!canAccess(permissions, PERMS.TICKETS_VIEW, session.user.rank)) {
		redirect("/admin");
	}

	const t = await getTranslations("pages.admin.helpTickets");
	const raw = await searchParams;
	const parsed = parseListParams(new URLSearchParams(raw));
	const statusFilter = raw.filter_status || "open";

	const conditions: Prisma.WebsiteHelpCenterTicketsWhereInput[] = [];

	if (statusFilter === "open") {
		conditions.push({ open: true });
	} else if (statusFilter === "closed") {
		conditions.push({ open: false });
	}

	if (parsed.search.trim()) {
		const q = parsed.search.trim();
		const asId = /^\d+$/.test(q) ? BigInt(q) : null;
		const matchingUsers = await prisma.user
			.findMany({
				where: { username: { contains: q } },
				select: { id: true },
				take: 50,
			})
			.catch(() => []);

		conditions.push({
			OR: [
				{ title: { contains: q } },
				{ content: { contains: q } },
				...(matchingUsers.length > 0
					? [{ userId: { in: matchingUsers.map((u) => u.id) } }]
					: []),
				...(asId !== null ? [{ id: asId }] : []),
			],
		});
	}

	const where: Prisma.WebsiteHelpCenterTicketsWhereInput =
		conditions.length === 0
			? {}
			: conditions.length === 1
				? conditions[0]
				: { AND: conditions };

	const SORT_MAP: Record<
		string,
		Prisma.WebsiteHelpCenterTicketsOrderByWithRelationInput
	> = {
		title: { title: "asc" },
		open: { open: "desc" },
		user: { userId: "asc" },
		date: { createdAt: "desc" },
		updated: { updatedAt: "desc" },
		id: { id: "desc" },
	};

	const baseOrder = SORT_MAP[parsed.sort ?? "updated"] ?? { updatedAt: "desc" };
	const orderField = Object.keys(baseOrder)[0] as keyof typeof baseOrder;
	const orderBy = {
		[orderField]: parsed.order,
	} as Prisma.WebsiteHelpCenterTicketsOrderByWithRelationInput;

	const [total, openCount, closedCount] = await Promise.all([
		prisma.websiteHelpCenterTickets.count({ where }).catch(() => 0),
		prisma.websiteHelpCenterTickets
			.count({ where: { open: true } })
			.catch(() => 0),
		prisma.websiteHelpCenterTickets
			.count({ where: { open: false } })
			.catch(() => 0),
	]);

	const pagination = calcPagination(total, parsed.page, parsed.perPage);

	const tickets = await prisma.websiteHelpCenterTickets
		.findMany({
			where,
			orderBy,
			skip: pagination.offset,
			take: pagination.perPage,
			select: {
				id: true,
				userId: true,
				title: true,
				open: true,
				createdAt: true,
				updatedAt: true,
			},
		})
		.catch(() => []);

	const ticketIds = tickets.map((ticket) => ticket.id);
	const userIds = [
		...new Set(
			tickets
				.map((ticket) => ticket.userId)
				.filter((id): id is number => id != null),
		),
	];

	const [replyGroups, users] = await Promise.all([
		ticketIds.length > 0
			? prisma.websiteHelpCenterTicketReplies
					.groupBy({
						by: ["ticketId"],
						where: { ticketId: { in: ticketIds } },
						_count: true,
					})
					.catch(() => [])
			: Promise.resolve([]),
		userIds.length > 0
			? prisma.user
					.findMany({
						where: { id: { in: userIds } },
						select: { id: true, username: true },
					})
					.catch(() => [])
			: Promise.resolve([]),
	]);

	const replyCountByTicket = new Map(
		replyGroups.map((g) => [String(g.ticketId), g._count]),
	);
	const usernameById = new Map(users.map((u) => [u.id, u.username]));

	const rows: HelpTicketRow[] = tickets.map((ticket) => ({
		id: String(ticket.id),
		title: ticket.title,
		user:
			ticket.userId != null
				? (usernameById.get(ticket.userId) ?? `#${ticket.userId}`)
				: "—",
		userId: ticket.userId,
		replies: replyCountByTicket.get(String(ticket.id)) ?? 0,
		open: ticket.open,
		date: formatDate(ticket.createdAt, "date"),
		updated: formatDate(ticket.updatedAt, "date"),
	}));

	return (
		<div className="space-y-6">
			<div
				className="rounded-lg border border-[var(--admin-info-border)] bg-[var(--admin-info-subtle)] px-4 py-3 text-sm"
				role="status"
			>
				<p className="m-0">{t("queueHint")}</p>
				<p className="m-0 mt-1">
					<a
						href="/admin/tickets"
						className="font-medium text-[var(--admin-accent)] underline-offset-2 hover:underline"
					>
						{t("queueOtherCta")}
					</a>
				</p>
			</div>
			<div className="grid grid-cols-[repeat(auto-fit,minmax(180px,1fr))] gap-3.5">
				<StatusCard label={t("statusOpen")} value={openCount} icon="🎫" />
				<StatusCard label={t("statusClosed")} value={closedCount} icon="✅" />
			</div>

			{total === 0 && !parsed.search && statusFilter === "open" ? (
				<div className="admin-empty">{t("noTickets")}</div>
			) : (
				<HelpTicketsTable
					data={{
						rows,
						total,
						page: pagination.page,
						perPage: pagination.perPage,
						lastPage: pagination.lastPage,
					}}
				/>
			)}
		</div>
	);
}