"use client";

import Link from "next/link";
import { useEffect, useMemo, useState } from "react";
import { Badge, Button, Container } from "@/components/ui";
import { useAuth } from "@/hooks/useAuth";
import { useMe } from "@/hooks/useMe";
import { useTenantHost } from "@/hooks/useTenantHost";
import { api, type PublicTenantSite } from "@/lib/api";
import { applyTheme } from "@/lib/theme";
import { loadCommercialProducts } from "@/modules/commercial/adapters";
import { CommercialEmptyState, ProductCard } from "@/modules/commercial/components";
import type { CommercialProduct } from "@/modules/commercial/types";

/**
 * صفحه ساب‌دامین tenant:
 * - مهمان / غیرعضو → لندینگ تمپلیت برند کسب‌وکار
 * - عضو/مالک لاگین‌شده → دسترسی به سرویس‌ها و داشبورد
 */
export function TenantSitePage() {
  const host = useTenantHost();
  const { isAuthenticated, login, loading: authLoading, signOut, user } = useAuth();
  const { me, loading: meLoading } = useMe();
  const [site, setSite] = useState<PublicTenantSite | null>(null);
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    let cancelled = false;
    (async () => {
      setLoading(true);
      setError("");
      try {
        const data = await api.public.tenantSite({
          slug: host.slug,
          host: host.hostname,
        });
        if (cancelled) return;
        setSite(data);
        applyTheme({
          site_name: data.name,
          primary_color: data.primary_color || "#0284c7",
          secondary_color: data.secondary_color || "#0f172a",
          logo_url: data.logo_url || "",
          support_email: "",
        });
        if (typeof document !== "undefined") {
          document.title = data.name;
        }
      } catch (e) {
        if (!cancelled) {
          setError(e instanceof Error ? e.message : "بارگذاری سایت ناموفق بود");
          setSite(null);
        }
      } finally {
        if (!cancelled) setLoading(false);
      }
    })();
    return () => {
      cancelled = true;
    };
  }, [host.slug, host.hostname]);

  const membership = useMemo(() => {
    if (!me || !site) return null;
    return me.memberships.find((m) => m.tenant_slug === site.slug) ?? null;
  }, [me, site]);

  const isMember = Boolean(isAuthenticated && membership);
  const isOwner = Boolean(membership?.is_owner);

  if (loading || (isAuthenticated && meLoading)) {
    return (
      <div className="flex min-h-[60vh] items-center justify-center">
        <div className="h-10 w-10 animate-spin rounded-full border-4 border-primary border-t-transparent" />
      </div>
    );
  }

  if (error || !site) {
    return (
      <Container className="py-20 text-center">
        <h1 className="text-2xl font-bold text-secondary">سایت یافت نشد</h1>
        <p className="mt-3 text-gray-600">{error || "این دامنه به workspace فعالی وصل نیست."}</p>
        <a href={`https://${host.baseDomain}`} className="mt-8 inline-block text-primary underline">
          بازگشت به تربت‌یار
        </a>
      </Container>
    );
  }

  if (isMember) {
    return (
      <TenantMemberHome
        site={site}
        isOwner={isOwner}
        role={membership?.role}
        userLabel={user?.username || user?.email || me?.mobile || "کاربر"}
        onSignOut={signOut}
      />
    );
  }

  return (
    <TenantPublicLanding
      site={site}
      onLogin={() => login()}
      authLoading={authLoading}
      platformUrl={`https://${host.baseDomain}`}
    />
  );
}

function TenantPublicLanding({
  site,
  onLogin,
  authLoading,
  platformUrl,
}: {
  site: PublicTenantSite;
  onLogin: () => void;
  authLoading: boolean;
  platformUrl: string;
}) {
  const initial = site.name.trim().charAt(0) || "ت";
  return (
    <div className="relative min-h-[calc(100vh-4rem)] overflow-hidden">
      <div
        className="pointer-events-none absolute inset-0 opacity-90"
        style={{
          background: `radial-gradient(ellipse 80% 60% at 50% -10%, var(--color-primary-muted), transparent),
            linear-gradient(180deg, var(--color-primary-soft) 0%, #fff 55%)`,
        }}
      />
      <Container className="relative flex min-h-[calc(100vh-4rem)] flex-col items-center justify-center py-16 text-center">
        <div className="mb-6 flex h-20 w-20 items-center justify-center overflow-hidden rounded-3xl bg-primary text-3xl font-bold text-white shadow-lg shadow-primary/25">
          {site.logo_url ? (
            // eslint-disable-next-line @next/next/no-img-element
            <img src={site.logo_url} alt="" className="h-full w-full object-cover" />
          ) : (
            initial
          )}
        </div>
        {site.business_type && (
          <Badge variant="primary" className="mb-4">
            {site.business_type}
          </Badge>
        )}
        <h1 className="max-w-2xl text-4xl font-extrabold leading-tight text-secondary sm:text-5xl">
          {site.name}
        </h1>
        <p className="mt-4 max-w-xl text-base leading-8 text-gray-600 sm:text-lg">
          {site.tagline}. به‌زودی صفحه عمومی و سرویس‌های این کسب‌وکار اینجا تکمیل می‌شود.
        </p>
        <div className="mt-10 flex flex-wrap items-center justify-center gap-3">
          <Button size="lg" onClick={onLogin} loading={authLoading} loadingText="...">
            ورود مالک / همکاران
          </Button>
          <a href={platformUrl}>
            <Button size="lg" variant="outline">
              درباره تربت‌یار
            </Button>
          </a>
        </div>
        {site.primary_domain && (
          <p dir="ltr" className="mt-10 font-mono text-xs text-gray-400">
            {site.primary_domain}
          </p>
        )}
      </Container>
    </div>
  );
}

function TenantMemberHome({
  site,
  isOwner,
  role,
  userLabel,
  onSignOut,
}: {
  site: PublicTenantSite;
  isOwner: boolean;
  role?: string;
  userLabel: string;
  onSignOut: () => void;
}) {
  return (
    <div className="pb-16">
      <section className="border-b border-gray-100 bg-gradient-to-b from-[var(--color-primary-soft)] to-white">
        <Container className="py-10 sm:py-12">
          <div className="flex flex-wrap items-start justify-between gap-4">
            <div>
              <Badge variant="primary" className="mb-3">
                {isOwner ? "مالک workspace" : role || "عضو"}
              </Badge>
              <h1 className="text-3xl font-extrabold text-secondary">{site.name}</h1>
              <p className="mt-2 text-sm text-gray-600">
                خوش آمدید {userLabel} — سرویس‌های تربت‌یار برای این کسب‌وکار
              </p>
              {site.primary_domain && (
                <p dir="ltr" className="mt-2 font-mono text-xs text-gray-400">
                  {site.primary_domain}
                </p>
              )}
            </div>
            <div className="flex flex-wrap gap-2">
              <Link href="/dashboard">
                <Button variant="primary">داشبورد workspace</Button>
              </Link>
              <Link href="/dashboard/settings">
                <Button variant="outline">تنظیمات</Button>
              </Link>
              <Button variant="ghost" onClick={onSignOut}>
                خروج
              </Button>
            </div>
          </div>
        </Container>
      </section>

      <TenantDiscoveredApps />
    </div>
  );
}

function TenantDiscoveredApps() {
  const [products, setProducts] = useState<CommercialProduct[]>([]);
  const [message, setMessage] = useState<string | undefined>();

  useEffect(() => {
    void loadCommercialProducts().then((r) => {
      setProducts(r.data.filter((p) => p.visibility !== "hidden"));
      setMessage(r.message);
    });
  }, []);

  return (
    <Container className="py-10">
      <h2 className="mb-2 text-xl font-bold text-secondary">محصولات کشف‌شده</h2>
      <p className="mb-8 text-sm text-gray-600">
        از رجیستری سرویس/محصول — بدون آرایه ثابت frontend.
      </p>
      {products.length ? (
        <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
          {products.map((p) => (
            <ProductCard key={p.product_code} product={p} />
          ))}
        </div>
      ) : (
        <CommercialEmptyState title="محصولی کشف نشد" description={message} />
      )}
    </Container>
  );
}