import { notFound, redirect } from "next/navigation";
import { getTranslations } from "next-intl/server";
import { TicketQueueBanner } from "@/components/admin/ticket-queue-banner";
import { getMinStaffRank } from "@/lib/admin/min-staff-rank";
import { positiveBigInt } from "@/lib/api";
import { activeBanWhere } from "@/lib/bans";
import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
import { prisma } from "@/lib/prisma";
import { AdminHelpTicketDetail } from "./admin-help-ticket-detail";

export default async function AdminHelpTicketDetailPage({
	params,
}: {
	params: Promise<{ id: 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 { id } = await params;
	const ticketId = positiveBigInt(id);
	if (!ticketId) notFound();

	const ticket = await prisma.websiteHelpCenterTickets.findUnique({
		where: { id: ticketId },
		select: {
			id: true,
			userId: true,
			categoryId: true,
			title: true,
			content: true,
			open: true,
			createdAt: true,
			updatedAt: true,
		},
	});

	if (!ticket) notFound();

	const replies = await prisma.websiteHelpCenterTicketReplies.findMany({
		where: { ticketId: ticket.id },
		orderBy: { id: "asc" },
		select: {
			id: true,
			userId: true,
			content: true,
			createdAt: true,
		},
	});

	const authorIds = [
		...new Set([
			...(ticket.userId != null ? [ticket.userId] : []),
			...replies.map((r) => r.userId),
		]),
	];

	const [users, category, activeBan] = await Promise.all([
		authorIds.length > 0
			? prisma.user.findMany({
					where: { id: { in: authorIds } },
					select: {
						id: true,
						username: true,
						rank: true,
						mail: true,
					},
				})
			: Promise.resolve([]),
		ticket.categoryId != null
			? prisma.websiteHelpCenterCategories.findUnique({
					where: { id: ticket.categoryId },
					select: { name: true },
				})
			: Promise.resolve(null),
		ticket.userId != null
			? prisma.ban.findFirst({
					where: { userId: ticket.userId, ...activeBanWhere() },
					select: { id: true },
				})
			: Promise.resolve(null),
	]);

	const userById = new Map(users.map((u) => [u.id, u]));
	const openerId = ticket.userId;
	const minStaffRank = await getMinStaffRank();

	const messages = [
		{
			key: "opening",
			userId: openerId ?? 0,
			username:
				openerId != null
					? (userById.get(openerId)?.username ?? `#${openerId}`)
					: "—",
			isStaff: false,
			content: ticket.content,
			createdAt: (ticket.createdAt ?? new Date()).toISOString(),
		},
		...replies.map((r) => {
			const user = userById.get(r.userId);
			const isStaff =
				r.userId !== openerId && (user?.rank ?? 0) >= minStaffRank;
			return {
				key: String(r.id),
				userId: r.userId,
				username: user?.username ?? `#${r.userId}`,
				isStaff,
				content: r.content,
				createdAt: (r.createdAt ?? new Date()).toISOString(),
			};
		}),
	];

	const creator = openerId != null ? userById.get(openerId) : undefined;

	const canEdit = canAccess(permissions, PERMS.TICKETS_EDIT, session.user.rank);
	const canLiftBan = canAccess(permissions, PERMS.USERS_BAN, session.user.rank);
	const isBanAppeal =
		/ban\s*appeal/i.test(ticket.title) ||
		/ban\s*appeal/i.test(category?.name ?? "");

	return (
		<div className="space-y-6">
			<TicketQueueBanner
				hint={t("queueHint")}
				otherHref="/admin/tickets"
				otherLabel={t("queueOtherCta")}
			/>
			<AdminHelpTicketDetail
				ticket={{
					id: String(ticket.id),
					title: ticket.title,
					open: ticket.open,
					createdAt: (ticket.createdAt ?? new Date()).toISOString(),
					updatedAt: (ticket.updatedAt ?? new Date()).toISOString(),
					categoryName: category?.name ?? (isBanAppeal ? "Ban appeal" : null),
					creator: creator
						? {
								id: creator.id,
								username: creator.username,
								rank: creator.rank,
								mail: creator.mail ?? "",
							}
						: null,
				}}
				messages={messages}
				canEdit={canEdit}
				canLiftBan={canLiftBan}
				hasActiveBan={!!activeBan}
			/>
		</div>
	);
}