import Link from "next/link";
import { redirect } from "next/navigation";
import { getTranslations } from "next-intl/server";
import { canAccess, getAdminContext, PERMS } from "@/lib/permissions";
import { prisma } from "@/lib/prisma";
import { getAuditLogs } from "@/lib/services/audit";
import {
	AuditSection,
	ExportSection,
	ImportSection,
	ManageSection,
	PresetsSection,
	TestSection,
} from "./client";

export const dynamic = "force-dynamic";

const GROUPS = [
	"Core", "Users", "Rooms", "Bans", "News", "Logs", "Settings",
	"Wordfilter", "Catalog", "Shop", "Events", "Tickets", "Moderation",
	"Polls", "Analytics", "DevOps", "Prefixes", "Banners", "Radio",
	"RCON", "Assets", "Export", "Notifications", "CMS Pages",
];

export default async function AdminHousekeeping({
	searchParams,
}: {
	searchParams: Promise<{
		tab?:
			| "overview"
			| "manage"
			| "import"
			| "ranks"
			| "presets"
			| "test"
			| "audit";
		group?: string;
	}>;
}) {
	const ctx = await getAdminContext();
	if (!canAccess(ctx.permissions, PERMS.SETTINGS_VIEW, ctx.session.user.rank)) {
		redirect("/admin");
	}

	const t = await getTranslations("pages.admin.housekeeping");
	const sp = await searchParams;
	const tab = sp.tab ?? "overview";

	type HKPerm = Awaited<
		ReturnType<typeof prisma.websiteHousekeepingPermissions.findMany>
	>[0];
	const allPermissions: HKPerm[] = await prisma.websiteHousekeepingPermissions
		.findMany({ orderBy: [{ groupName: "asc" }, { permission: "asc" }] })
		.catch(() => []);

	const ranks = allPermissions.map((p) => p.minRank);
	const maxRank = ranks.length ? Math.max(...ranks) : 0;
	const totalMin = ranks.reduce((sum, r) => sum + r, 0);

	const groupCounts: Record<string, number> = {};
	for (const p of allPermissions) {
		const g: string = p.groupName ?? "Uncategorized";
		groupCounts[g] = (groupCounts[g] || 0) + 1;
	}

	const rankGroups: Record<string, typeof allPermissions> = {};
	for (const p of allPermissions) {
		if (!rankGroups[p.minRank]) rankGroups[p.minRank] = [];
		rankGroups[p.minRank].push(p);
	}

	const missingDeps: Array<{ permission: string; dependsOn: string }> = [];
	const permSet = new Set(allPermissions.map((p) => p.permission));
	for (const p of allPermissions) {
		if (p.dependsOn && !permSet.has(p.dependsOn)) {
			missingDeps.push({ permission: p.permission, dependsOn: p.dependsOn });
		}
	}

	const allGroups = [...new Set([...GROUPS, ...Object.keys(groupCounts)])];

	const auditLogs = await getAuditLogs({
		search: "housekeeping",
		perPage: 25,
	}).catch(() => null);

	return (
		<main>
			<div className="admin-tabs mb-4">
				<Link
					href="/admin/housekeeping?tab=overview"
					className={"admin-tab " + (tab === "overview" ? "active" : "")}
				>
					{t("tabOverview")}
				</Link>
				<Link
					href="/admin/housekeeping?tab=manage"
					className={"admin-tab " + (tab === "manage" ? "active" : "")}
				>
					{t("tabManage")}
				</Link>
				<Link
					href="/admin/housekeeping?tab=import"
					className={"admin-tab " + (tab === "import" ? "active" : "")}
				>
					{t("tabImport")}
				</Link>
				<Link
					href="/admin/housekeeping?tab=ranks"
					className={"admin-tab " + (tab === "ranks" ? "active" : "")}
				>
					{t("tabRanks")}
				</Link>
				<Link
					href="/admin/housekeeping?tab=presets"
					className={"admin-tab " + (tab === "presets" ? "active" : "")}
				>
					{t("tabPresets")}
				</Link>
				<Link
					href="/admin/housekeeping?tab=test"
					className={"admin-tab " + (tab === "test" ? "active" : "")}
				>
					{t("tabTest")}
				</Link>
				<Link
					href="/admin/housekeeping?tab=audit"
					className={"admin-tab " + (tab === "audit" ? "active" : "")}
				>
					{t("tabAudit")}
				</Link>
			</div>

			{tab === "overview" && (
				<>
					<div className="admin-stat-row">
						<span className="admin-stat-chip">
							{t("permissionsCount", { count: allPermissions.length })}
						</span>
						<span className="admin-stat-chip">
							{t("highestMinRank", { rank: maxRank })}
						</span>
						<span className="admin-stat-chip">
							{t("totalMinRank", { total: totalMin })}
						</span>
						<span className="admin-stat-chip">
							{t("groupCount", { count: Object.keys(groupCounts).length })}
						</span>
						<span className="admin-stat-chip">
							{t("rankCount", { count: Object.keys(rankGroups).length })}
						</span>
						{missingDeps.length > 0 && (
							<span
								className="admin-stat-chip"
								style={{ color: "var(--color-danger)" }}
							>
								{t("missingDeps", { count: missingDeps.length })}
							</span>
						)}
					</div>

					<section className="mb-6">
						<h2 className="admin-section-title">{t("perGroup")}</h2>
						<div className="grid grid-cols-2 md:grid-cols-4 gap-3">
							{Object.entries(groupCounts)
								.sort(([a], [b]) => a.localeCompare(b))
								.map(([group, count]) => (
									<Link
										key={group}
										href={
											"/admin/housekeeping?tab=manage&group=" +
											encodeURIComponent(group)
										}
										className="admin-card block p-3 hover:opacity-80 transition-opacity"
									>
										<div className="font-semibold text-sm">{group}</div>
										<div className="text-xs opacity-60">
											{count} {count === 1 ? t("permission") : t("permissions")}
										</div>
									</Link>
								))}
						</div>
					</section>

					<section>
						<h2 className="admin-section-title">{t("perRank")}</h2>
						<div className="overflow-x-auto">
							<table>
								<thead>
									<tr>
										<th>{t("rank")}</th>
										<th>{t("count")}</th>
										<th>{t("permissions")}</th>
									</tr>
								</thead>
								<tbody>
									{Object.entries(rankGroups)
										.sort(([a], [b]) => Number(b) - Number(a))
										.map(([rank, perms]) => (
											<tr key={rank}>
												<td className="font-semibold">Rank {rank}</td>
												<td>{perms.length}</td>
												<td className="text-xs opacity-70">
													{perms.map((p) => p.permission).join(", ")}
												</td>
											</tr>
										))}
								</tbody>
							</table>
						</div>
					</section>

					{missingDeps.length > 0 && (
						<section className="mt-6">
							<h2
								className="admin-section-title"
								style={{ color: "var(--color-danger)" }}
							>
								{t("missingDeps")}
							</h2>
							<div className="admin-card">
								<ul className="list-disc pl-5 text-sm">
									{missingDeps.map((d) => (
										<li key={d.permission}>
											<strong>{d.permission}</strong> {t("dependsOn")}{" "}
											<code>{d.dependsOn}</code> &mdash; {t("notFound")}
										</li>
									))}
								</ul>
							</div>
						</section>
					)}
				</>
			)}

			{tab === "manage" && (
				<ManageSection
					permissions={allPermissions}
					groups={allGroups}
					groupCounts={groupCounts}
					permSet={permSet}
				/>
			)}

			{tab === "import" && (
				<>
					<ImportSection />
					<div className="mt-8">
						<ExportSection />
					</div>
				</>
			)}

			{tab === "presets" && <PresetsSection />}

			{tab === "test" && <TestSection permissions={allPermissions} />}

			{tab === "ranks" && (
				<section>
					<h2 className="admin-section-title">{t("perRank")}</h2>
					<p className="text-xs text-[var(--admin-text-muted)] -mt-2 mb-3">
						{t("rankOverviewHint")}
					</p>
					{Object.keys(rankGroups).length === 0 ? (
						<div className="admin-empty">{t("noPermissions")}</div>
					) : (
						<div className="space-y-4">
							{Object.entries(rankGroups)
								.sort(([a], [b]) => Number(b) - Number(a))
								.map(([rank, perms]) => {
									const groupsInRank: Record<string, typeof perms> = {};
									for (const p of perms) {
										const g = p.groupName ?? "Uncategorized";
										if (!groupsInRank[g]) groupsInRank[g] = [];
										groupsInRank[g].push(p);
									}
									return (
										<div key={rank} className="admin-card">
											<div className="flex items-center justify-between mb-2">
												<h3 className="text-lg font-bold">
													{t("rank")} {rank}
												</h3>
												<span className="text-sm opacity-60">
													{perms.length} {t("permissions")}
												</span>
											</div>
											<div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-2">
												{Object.entries(groupsInRank)
													.sort(([a], [b]) => a.localeCompare(b))
													.map(([group, groupPerms]) => (
														<div key={group}>
															<div className="text-xs font-semibold uppercase tracking-wider opacity-60 mb-1">
																{group}
															</div>
															<ul className="list-disc pl-4 text-xs space-y-0.5">
																{groupPerms.map((p) => (
																	<li key={p.permission}>
																		{p.permission}
																		{p.dependsOn ? (
																			<span className="opacity-50 ml-1">
																				&rarr; {p.dependsOn}
																			</span>
																		) : null}
																	</li>
																))}
															</ul>
														</div>
													))}
											</div>
										</div>
									);
								})}
						</div>
					)}
				</section>
			)}

			{tab === "audit" && <AuditSection initialLogs={auditLogs} />}
		</main>
	);
}