import { FolderKanban, ImageIcon, LockKeyhole, ShieldAlert } from "lucide-react";
import { redirect } from "next/navigation";

import { Container } from "@/components/layout/container";
import { StatsCard } from "@/components/dashboard/stats-card";
import { MotionFade } from "@/components/motion-fade";
import { AdminDashboardShell } from "@/components/admin/admin-dashboard-shell";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardDescription, CardHeader } from "@/components/ui/card";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  clearAdminSessionCookie,
  getAdminLockState,
  isAdminAuthConfigured,
  isAdminAuthenticated,
  isPasswordValid,
  registerFailedAdminAttempt,
  resetAdminFailedAttempts,
  setAdminSessionCookie,
} from "@/lib/admin-auth";
import { getAdminAppPath } from "@/lib/admin-routing";
import { readFlash } from "@/lib/admin-feedback";
import { getMaintenanceMode } from "@/lib/app-config";
import { getAdminMediaAssets } from "@/lib/media";
import { getAdminPortfolioCategories, getAdminPortfolioProjects } from "@/lib/portfolio";

type AdminPageProps = {
  searchParams?: Promise<{
    error?: string;
    success?: string;
  }>;
};

export const dynamic = "force-dynamic";

const copy = {
  title: "Uebersicht",
  subtitle: "Kompakter Status zu Portfolio, Media und Wartung.",
  overview: "Uebersicht",
  maintenance: "Wartungsmodus",
  media: "Media",
  siteSettings: "Settings",
  portfolio: "Portfolio",
  uiKit: "UI Kit",
  logout: "Ausloggen",
  backToSite: "Zur Website",
  loginTitle: "Admin Login",
  loginText: "Nur autorisierte Nutzer duerfen diesen Bereich verwenden.",
  passwordLabel: "Passwort",
  loginButton: "Einloggen",
  invalidLogin: "Falsches Passwort.",
  lockedLogin: "Zu viele Fehlversuche. Bitte spaeter erneut versuchen.",
  configMissing: "ADMIN_PASSWORD und ADMIN_AUTH_SECRET fehlen in env.",
  basicAuthMissing: "ADMIN_BASIC_AUTH_USER und ADMIN_BASIC_AUTH_PASS fehlen in env.",
  maintenanceOn: "Aktiv",
  maintenanceOff: "Inaktiv",
  portfolioOnline: "Portfolio online",
  mediaImages: "Media Images",
  maintenanceStatus: "Maintenance",
  drafts: "Drafts",
  activeCategories: "Active Categories",
};

export default async function AdminPage({ searchParams }: AdminPageProps) {
  const resolvedSearchParams = await searchParams;
  const flash = readFlash(resolvedSearchParams);
  const authConfigured = isAdminAuthConfigured();
  const basicConfigured = Boolean(
    process.env.ADMIN_BASIC_AUTH_USER && process.env.ADMIN_BASIC_AUTH_PASS,
  );
  const authenticated = await isAdminAuthenticated();
  const lockState = await getAdminLockState();

  async function loginAction(formData: FormData) {
    "use server";

    const password = String(formData.get("password") ?? "");
    const currentLockState = await getAdminLockState();

    if (currentLockState.locked) {
      redirect(`${getAdminAppPath("/")}?error=locked`);
    }

    if (!isAdminAuthConfigured() || !isPasswordValid(password)) {
      const failState = await registerFailedAdminAttempt();
      if (failState.locked) {
        redirect(`${getAdminAppPath("/")}?error=locked`);
      }

      redirect(`${getAdminAppPath("/")}?error=invalid`);
    }

    await resetAdminFailedAttempts();
    await setAdminSessionCookie();
    redirect(getAdminAppPath("/"));
  }

  async function logoutAction() {
    "use server";

    await clearAdminSessionCookie();
    redirect(getAdminAppPath("/"));
  }

  if (!authenticated) {
    return (
      <Container size="narrow" className="py-12">
        <MotionFade>
          <Card className="border-border/70 bg-card/95 shadow-sm">
            <CardHeader>
              <p className="inline-flex items-center gap-2 text-sm font-medium text-muted-foreground">
                <LockKeyhole className="h-4 w-4 text-brand-primary" />
                {copy.loginTitle}
              </p>
              <CardDescription>{copy.loginText}</CardDescription>
            </CardHeader>
            <CardContent>
              {!authConfigured ? (
                <p className="mb-4 rounded-nested border border-destructive/30 bg-destructive/10 px-3 py-2 text-sm text-destructive">
                  {copy.configMissing}
                </p>
              ) : null}

              {!basicConfigured ? (
                <p className="mb-4 rounded-nested border border-destructive/30 bg-destructive/10 px-3 py-2 text-sm text-destructive">
                  {copy.basicAuthMissing}
                </p>
              ) : null}

              {resolvedSearchParams?.error === "invalid" ? (
                <p className="mb-4 rounded-nested border border-status-warning/30 bg-status-warning-soft px-3 py-2 text-sm text-status-warning">
                  {copy.invalidLogin}
                </p>
              ) : null}

              {resolvedSearchParams?.error === "locked" || lockState.locked ? (
                <p className="mb-4 rounded-nested border border-status-warning/30 bg-status-warning-soft px-3 py-2 text-sm text-status-warning">
                  {copy.lockedLogin}
                </p>
              ) : null}

              <form action={loginAction} className="space-y-3">
                <div className="space-y-2">
                  <Label htmlFor="password" className="sr-only">
                    {copy.passwordLabel}
                  </Label>
                  <div className="relative">
                    <LockKeyhole className="pointer-events-none absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-muted-foreground" />
                    <Input
                      id="password"
                      type="password"
                      name="password"
                      required
                      placeholder={copy.passwordLabel}
                      className="pl-9"
                    />
                  </div>
                </div>
                <Button
                  type="submit"
                  disabled={!authConfigured || !basicConfigured || lockState.locked}
                >
                  <LockKeyhole className="h-4 w-4" />
                  {copy.loginButton}
                </Button>
              </form>
            </CardContent>
          </Card>
        </MotionFade>
      </Container>
    );
  }

  const [maintenanceEnabled, categories, projects, mediaAssets] = await Promise.all([
    getMaintenanceMode(),
    getAdminPortfolioCategories(),
    getAdminPortfolioProjects(),
    getAdminMediaAssets(),
  ]);

  const publishedProjects = projects.filter((project) => project.isPublished).length;
  const draftProjects = projects.length - publishedProjects;
  const activeCategories = categories.filter((category) => category.isActive).length;
  const imageCount = mediaAssets.filter((asset) => asset.kind === "IMAGE").length;

  return (
    <AdminDashboardShell
      copy={copy}
      active="overview"
      flash={flash}
      logoutAction={logoutAction}
      headerTitle={copy.title}
      headerDescription={copy.subtitle}
    >
      <div className="space-y-6">
        <section className="grid gap-4 md:grid-cols-2 xl:grid-cols-3">
          <MotionFade delay={0.05}>
            <StatsCard
              title={copy.portfolioOnline}
              value={String(publishedProjects)}
              icon={FolderKanban}
              className="h-full"
              footer={(
                <div className="flex flex-wrap gap-x-4 gap-y-2 text-sm text-muted-foreground">
                  <span>{copy.drafts}: {draftProjects}</span>
                  <span>{copy.activeCategories}: {activeCategories}</span>
                </div>
              )}
            />
          </MotionFade>

          <MotionFade delay={0.1}>
            <StatsCard
              title={copy.mediaImages}
              value={String(imageCount)}
              icon={ImageIcon}
              description="Anzahl der Bilder innerhalb der Media Library."
              className="h-full"
            />
          </MotionFade>

          <MotionFade delay={0.15}>
            <StatsCard
              title={copy.maintenanceStatus}
              value={maintenanceEnabled ? copy.maintenanceOn : copy.maintenanceOff}
              icon={ShieldAlert}
              className="h-full"
              footer={(
                <div className="flex items-center justify-between gap-3 text-sm">
                  <span className="text-muted-foreground">
                    {maintenanceEnabled
                      ? "Website ist aktuell fuer Besucher gesperrt."
                      : "Website ist aktuell offen."}
                  </span>
                  <Badge variant={maintenanceEnabled ? "warning" : "success"}>
                    {maintenanceEnabled ? copy.maintenanceOn : copy.maintenanceOff}
                  </Badge>
                </div>
              )}
            />
          </MotionFade>
        </section>
      </div>
    </AdminDashboardShell>
  );
}