"use client";

import { useCallback, useEffect, useState } from "react";
import Link from "next/link";
import { AuthGuard } from "@/components/AuthGuard";
import { Button, Container } from "@/components/ui";
import { api, ApiError } from "@/lib/api";
import { useMe } from "@/hooks/useMe";
import { evaluateDomainPolicy, loadWorkspaceSnapshot } from "../adapters";
import type { AdapterResult, CommercialWorkspaceSnapshot, DomainPolicyResult } from "../types";
import { DomainPolicyPanel, FeatureLock, PlatformShell } from "../components";
import { CommercialEmptyState } from "../components/CommercialEmptyState";

function DomainsInner() {
  const { me, loading: meLoading } = useMe();
  const [snap, setSnap] = useState<AdapterResult<CommercialWorkspaceSnapshot | null> | null>(null);
  const [policy, setPolicy] = useState<DomainPolicyResult | null>(null);
  const [customDomain, setCustomDomain] = useState("");
  const [error, setError] = useState("");
  const [msg, setMsg] = useState("");
  const [busy, setBusy] = useState(false);

  const load = useCallback(async () => {
    const s = await loadWorkspaceSnapshot();
    setSnap(s);
    if (s.data) {
      setPolicy(s.data.domain_policy || null);
    } else if (me?.current_tenant_id) {
      const pol = await evaluateDomainPolicy({ tenant_id: me.current_tenant_id });
      setPolicy(pol.data);
    }
  }, [me?.current_tenant_id]);

  useEffect(() => {
    if (meLoading || !me) return;
    void load();
  }, [me, meLoading, load]);

  const unlocked = Boolean(snap?.data?.custom_domain_unlocked ?? policy?.custom_domain_allowed);

  const submit = async () => {
    if (!snap?.data?.tenant_id || !customDomain.trim()) return;
    setBusy(true);
    setError("");
    setMsg("");
    try {
      if (!unlocked) {
        setError(policy?.reason || "دامنه اختصاصی بر اساس سیاست قفل است.");
        setBusy(false);
        return;
      }
      await api.onboarding.updateDomain(snap.data.tenant_id, {
        custom_domain: customDomain.trim(),
      });
      setMsg("دامنه ثبت شد — تأیید DNS را از وضعیت زیرگیری کنید.");
      await load();
    } catch (err) {
      setError(err instanceof ApiError ? err.message : "ثبت دامنه ناموفق بود");
    } finally {
      setBusy(false);
    }
  };

  if (meLoading) {
    return (
      <Container className="py-16 text-center">
        <p className="text-sm text-gray-500">در حال بارگذاری…</p>
      </Container>
    );
  }

  const ws = snap?.data;

  return (
    <PlatformShell title="دامنه و SSL" subtitle="قبل از اشتراک فقط زیردامنه؛ بعد از entitlement دامنه اختصاصی">
      {!ws ? (
        <CommercialEmptyState title="Workspace نیست" description={snap?.message} actionHref="/onboarding" actionLabel="راه‌اندازی" />
      ) : (
        <div className="space-y-6">
          <div className="rounded-2xl border border-gray-100 bg-white p-5 dark:border-gray-800 dark:bg-gray-900">
            <p className="text-sm text-gray-500">زیردامنه پلتفرم</p>
            <p className="mt-1 font-mono text-lg text-secondary dark:text-gray-100" dir="ltr">
              {ws.slug}.torbatyar.ir
            </p>
            {ws.primary_domain ? (
              <p className="mt-2 text-sm">
                دامنه اصلی:{" "}
                <span className="font-mono" dir="ltr">
                  {ws.primary_domain}
                </span>
              </p>
            ) : null}
          </div>

          <DomainPolicyPanel unlocked={unlocked} policy={policy || ws.domain_policy} tenantId={ws.tenant_id} />

          <FeatureLock
            locked={!unlocked}
            reason={policy?.reason}
            tenantId={ws.tenant_id}
            featureKey="custom_domain"
            fallback={
              <div className="rounded-2xl border border-dashed border-gray-200 bg-gray-50 p-5 text-sm text-gray-600 dark:border-gray-700 dark:bg-gray-900">
                اتصال دامنه اختصاصی قفل است.{" "}
                <Link href="/billing" className="font-semibold text-primary">
                  ارتقا در Billing
                </Link>
              </div>
            }
          >
            <div className="space-y-3 rounded-2xl border border-gray-100 bg-white p-5 dark:border-gray-800 dark:bg-gray-900">
              <label className="block text-sm font-medium text-secondary dark:text-gray-100">
                اتصال دامنه اختصاصی
                <input
                  dir="ltr"
                  className="mt-1 w-full rounded-xl border border-gray-200 px-4 py-2.5 text-sm dark:border-gray-700 dark:bg-gray-950"
                  placeholder="shop.example.com"
                  value={customDomain}
                  onChange={(e) => setCustomDomain(e.target.value)}
                />
              </label>
              <Button loading={busy} onClick={() => void submit()}>
                ذخیره و شروع تأیید
              </Button>
            </div>
          </FeatureLock>

          <section>
            <h3 className="text-sm font-semibold text-secondary dark:text-gray-100">وضعیت دامنه‌ها</h3>
            {ws.domains.length ? (
              <ul className="mt-3 space-y-2">
                {ws.domains.map((d) => (
                  <li
                    key={d.id}
                    className="flex flex-wrap items-center justify-between gap-2 rounded-xl border border-gray-100 bg-white px-3 py-2 text-sm dark:border-gray-800 dark:bg-gray-900"
                  >
                    <span className="font-mono" dir="ltr">
                      {d.domain}
                    </span>
                    <span className="text-xs text-gray-500">
                      {d.domain_type} · {d.is_verified ? "verified" : "pending"}
                    </span>
                  </li>
                ))}
              </ul>
            ) : (
              <CommercialEmptyState
                title="دامنه‌ای ثبت نشده"
                description="زیردامنه workspace به‌صورت پیش‌فرض فعال است. دامنه اختصاصی پس از entitlement اضافه می‌شود."
                hint="وضعیت تأیید DNS و SSL پس از ثبت دامنه اینجا نمایش داده می‌شود."
                actionHref="/billing"
                actionLabel="بررسی entitlement"
                secondaryHref="/help"
                secondaryLabel="راهنمای دامنه"
              />
            )}
          </section>

          {error ? <p className="rounded-lg bg-red-50 px-3 py-2 text-sm text-red-600">{error}</p> : null}
          {msg ? <p className="rounded-lg bg-emerald-50 px-3 py-2 text-sm text-emerald-700">{msg}</p> : null}
        </div>
      )}
    </PlatformShell>
  );
}

export function CommercialDomainsPage() {
  return (
    <AuthGuard>
      <DomainsInner />
    </AuthGuard>
  );
}