"use client";

import { useEffect, useMemo, useState } from "react";
import Link from "next/link";
import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
import { toast } from "sonner";
import { Button, Card, CardContent, Input, PageHeader, Textarea, Badge, Label } from "@/components/ds";
import { HospitalityBreadcrumbs } from "@/modules/hospitality/components/HospitalityBreadcrumbs";
import { HospitalityPageLoader, HospitalityPageError } from "@/modules/hospitality/pages/shared";
import { hospitalityApi } from "@/modules/hospitality/services/hospitality-api";
import { useTenantId } from "@/hooks/useTenantId";
import { useHospitalityProductBrand } from "@/modules/hospitality/hooks/useHospitalityProductBrand";
import { cn } from "@/lib/utils";

const STEPS = [
  { id: "profile", label: "پروفایل کسب‌وکار" },
  { id: "hours", label: "ساعات کار" },
  { id: "taxes", label: "مالیات" },
  { id: "menu", label: "منو" },
  { id: "integrations", label: "یکپارچه‌سازی‌ها" },
  { id: "checklist", label: "چک‌لیست" },
] as const;

type StepId = (typeof STEPS)[number]["id"];

export function RestaurantOnboardingPage() {
  const { tenantId } = useTenantId();
  const brand = useHospitalityProductBrand();
  const qc = useQueryClient();
  const [step, setStep] = useState<StepId>("profile");
  const [venueName, setVenueName] = useState("");
  const [venueCode, setVenueCode] = useState("");
  const [address, setAddress] = useState("");
  const [hoursJson, setHoursJson] = useState('{"sat":"09:00-23:00","sun":"09:00-23:00"}');
  const [taxJson, setTaxJson] = useState('{"vat_percent":9}');

  const venuesQ = useQuery({
    queryKey: ["hospitality", tenantId, "onboarding-venues"],
    queryFn: () => hospitalityApi.venues.list(tenantId!, { page: 1, page_size: 50 }),
    enabled: !!tenantId,
  });

  const menusQ = useQuery({
    queryKey: ["hospitality", tenantId, "onboarding-menus"],
    queryFn: () => hospitalityApi.menus.list(tenantId!, { page: 1, page_size: 50 }),
    enabled: !!tenantId,
  });

  const settingsQ = useQuery({
    queryKey: ["hospitality", tenantId, "onboarding-settings"],
    queryFn: () => hospitalityApi.settings.list(tenantId!, { page: 1, page_size: 200 }),
    enabled: !!tenantId,
  });

  const connectorsQ = useQuery({
    queryKey: ["hospitality", tenantId, "onboarding-connectors"],
    queryFn: () => hospitalityApi.connectorRegistrations.list(tenantId!, { page: 1, page_size: 100 }),
    enabled: !!tenantId,
  });

  const primaryVenue = venuesQ.data?.[0];

  useEffect(() => {
    if (!primaryVenue) return;
    setVenueName(String(primaryVenue.name || ""));
    setVenueCode(String(primaryVenue.code || ""));
    const meta = primaryVenue.metadata as Record<string, unknown> | undefined;
    setAddress(String(primaryVenue.address || meta?.address || ""));
  }, [primaryVenue]);

  const createVenue = useMutation({
    mutationFn: async () => {
      if (!tenantId) throw new Error("tenant");
      return hospitalityApi.venues.create(tenantId, {
        code: venueCode || `venue-${Date.now()}`,
        name: venueName || "رستوران",
        format: "restaurant",
        status: "active",
        metadata: { address, source: "hospitality_onboarding" },
      });
    },
    onSuccess: () => {
      toast.success("مکان ایجاد شد");
      void qc.invalidateQueries({ queryKey: ["hospitality", tenantId] });
      setStep("hours");
    },
    onError: (e: Error) => toast.error(e.message),
  });

  const upsertSetting = useMutation({
    mutationFn: async (payload: { key: string; value: unknown }) => {
      if (!tenantId) throw new Error("tenant");
      return hospitalityApi.settings.upsert(tenantId, {
        key: payload.key,
        value: payload.value,
        venue_id: primaryVenue?.id,
      });
    },
    onSuccess: () => {
      toast.success("تنظیمات ذخیره شد");
      void qc.invalidateQueries({ queryKey: ["hospitality", tenantId, "onboarding-settings"] });
    },
    onError: (e: Error) => toast.error(e.message),
  });

  const createMenu = useMutation({
    mutationFn: async () => {
      if (!tenantId || !primaryVenue?.id) throw new Error("venue_required");
      return hospitalityApi.menus.create(tenantId, {
        code: `menu-${Date.now()}`,
        name: "منوی اصلی",
        venue_id: primaryVenue.id,
        status: "draft",
      });
    },
    onSuccess: () => {
      toast.success("منوی پیش‌نویس ساخته شد");
      void qc.invalidateQueries({ queryKey: ["hospitality", tenantId] });
      setStep("integrations");
    },
    onError: (e: Error) => toast.error(e.message),
  });

  const checklist = useMemo(() => {
    const settings = settingsQ.data || [];
    const hasHours = settings.some((s) => String(s.key).includes("working_hours"));
    const hasTax = settings.some((s) => String(s.key).includes("tax"));
    const kinds = new Set((connectorsQ.data || []).map((c) => String(c.kind)));
    return [
      { id: "venue", label: "پروفایل / مکان", done: (venuesQ.data?.length || 0) > 0, href: "/hospitality/branches" },
      { id: "hours", label: "ساعات کار", done: hasHours, href: "/hospitality/settings" },
      { id: "tax", label: "مالیات", done: hasTax, href: "/hospitality/settings" },
      { id: "menu", label: "منو", done: (menusQ.data?.length || 0) > 0, href: "/hospitality/menu" },
      { id: "payment", label: "پرداخت POS (محلی)", done: false, href: "/hospitality/pos/register", hint: "پرداخت PSP از سرویس Payment — POS محلی Hospitality" },
      { id: "qr", label: "QR", done: false, href: "/hospitality/qr/menu", hint: "پس از منو از QR بسازید" },
      { id: "delivery", label: "پیک", done: kinds.has("delivery"), href: "/hospitality/integrations/delivery" },
      { id: "loyalty", label: "وفاداری", done: kinds.has("loyalty"), href: "/hospitality/integrations/loyalty" },
      { id: "crm", label: "CRM", done: kinds.has("crm"), href: "/hospitality/integrations/crm" },
      { id: "communication", label: "ارتباطات", done: kinds.has("communication"), href: "/hospitality/integrations/communication" },
      { id: "printer", label: "پرینتر / station", done: false, href: "/hospitality/pos/pro", hint: "POS stations در بسته POS Pro" },
    ];
  }, [venuesQ.data, menusQ.data, settingsQ.data, connectorsQ.data]);

  const doneCount = checklist.filter((c) => c.done).length;
  const pct = Math.round((doneCount / checklist.length) * 100);

  if (!tenantId || venuesQ.isLoading) return <HospitalityPageLoader />;
  if (venuesQ.error) return <HospitalityPageError error={venuesQ.error} onRetry={() => venuesQ.refetch()} />;

  const productLabel = brand.data?.displayName || "محصول Hospitality";

  return (
    <div className="space-y-6">
      <HospitalityBreadcrumbs current="راه‌اندازی رستوران" />
      <PageHeader
        title="ویزارد راه‌اندازی رستوران"
        description={`اولین اجرا برای ${productLabel} — فقط داده واقعی API، بدون کارت دمو.`}
        actions={<Badge tone="primary">{pct}% تکمیل</Badge>}
      />

      <div className="flex flex-wrap gap-2">
        {STEPS.map((s) => (
          <button
            key={s.id}
            type="button"
            onClick={() => setStep(s.id)}
            className={cn(
              "rounded-full px-3 py-1.5 text-xs font-medium",
              step === s.id
                ? "bg-[var(--hospitality-accent)] text-white"
                : "bg-[var(--surface-muted)] text-[var(--muted)]"
            )}
          >
            {s.label}
          </button>
        ))}
      </div>

      {step === "profile" ? (
        <Card>
          <CardContent className="space-y-3 p-4">
            <p className="text-sm text-[var(--muted)]">
              {primaryVenue
                ? "مکان موجود یافت شد — می‌توانید ادامه دهید یا مکان جدید بسازید."
                : "هنوز مکانی نیست. نام، کد و آدرس را وارد کنید."}
            </p>
            <div>
              <Label>نام مکان</Label>
              <Input className="mt-1" value={venueName} onChange={(e) => setVenueName(e.target.value)} />
            </div>
            <div>
              <Label>کد</Label>
              <Input className="mt-1" value={venueCode} onChange={(e) => setVenueCode(e.target.value)} dir="ltr" />
            </div>
            <div>
              <Label>آدرس</Label>
              <Textarea className="mt-1" value={address} onChange={(e) => setAddress(e.target.value)} rows={2} />
            </div>
            <div className="flex flex-wrap gap-2">
              {!primaryVenue ? (
                <Button loading={createVenue.isPending} onClick={() => createVenue.mutate()}>
                  ایجاد مکان
                </Button>
              ) : (
                <Button onClick={() => setStep("hours")}>ادامه</Button>
              )}
              <Link href="/hospitality/branches">
                <Button variant="outline">مدیریت مکان‌ها</Button>
              </Link>
            </div>
          </CardContent>
        </Card>
      ) : null}

      {step === "hours" ? (
        <Card>
          <CardContent className="space-y-3 p-4">
            <p className="text-sm text-[var(--muted)]">ساعات کار در settings با کلید working_hours ذخیره می‌شود.</p>
            <div>
              <Label>ساعات (JSON)</Label>
              <Textarea
                className="mt-1"
                value={hoursJson}
                onChange={(e) => setHoursJson(e.target.value)}
                rows={4}
                dir="ltr"
              />
            </div>
            <div className="flex gap-2">
              <Button
                loading={upsertSetting.isPending}
                onClick={() => {
                  try {
                    upsertSetting.mutate(
                      { key: "working_hours", value: JSON.parse(hoursJson) },
                      { onSuccess: () => setStep("taxes") }
                    );
                  } catch {
                    toast.error("JSON نامعتبر");
                  }
                }}
              >
                ذخیره ساعات
              </Button>
              <Button variant="outline" onClick={() => setStep("taxes")}>
                رد کردن
              </Button>
            </div>
          </CardContent>
        </Card>
      ) : null}

      {step === "taxes" ? (
        <Card>
          <CardContent className="space-y-3 p-4">
            <p className="text-sm text-[var(--muted)]">نرخ مالیات محلی در settings — حسابداری از کانکتور جداست.</p>
            <div>
              <Label>مالیات (JSON)</Label>
              <Textarea
                className="mt-1"
                value={taxJson}
                onChange={(e) => setTaxJson(e.target.value)}
                rows={3}
                dir="ltr"
              />
            </div>
            <div className="flex gap-2">
              <Button
                loading={upsertSetting.isPending}
                onClick={() => {
                  try {
                    upsertSetting.mutate(
                      { key: "tax", value: JSON.parse(taxJson) },
                      { onSuccess: () => setStep("menu") }
                    );
                  } catch {
                    toast.error("JSON نامعتبر");
                  }
                }}
              >
                ذخیره مالیات
              </Button>
              <Button variant="outline" onClick={() => setStep("menu")}>
                رد کردن
              </Button>
            </div>
          </CardContent>
        </Card>
      ) : null}

      {step === "menu" ? (
        <Card>
          <CardContent className="space-y-3 p-4">
            <p className="text-sm text-[var(--muted)]">
              {(menusQ.data?.length || 0) > 0
                ? `${menusQ.data!.length} منو موجود است.`
                : "منوی پیش‌نویس بسازید یا بعداً از صفحه منو وارد کنید."}
            </p>
            <div className="flex flex-wrap gap-2">
              {(menusQ.data?.length || 0) === 0 ? (
                <Button
                  loading={createMenu.isPending}
                  disabled={!primaryVenue}
                  onClick={() => createMenu.mutate()}
                >
                  ایجاد منوی پیش‌نویس
                </Button>
              ) : (
                <Button onClick={() => setStep("integrations")}>ادامه</Button>
              )}
              <Link href="/hospitality/menu">
                <Button variant="outline">صفحه منو</Button>
              </Link>
            </div>
          </CardContent>
        </Card>
      ) : null}

      {step === "integrations" ? (
        <Card>
          <CardContent className="space-y-3 p-4">
            <p className="text-sm text-[var(--muted)]">
              کانکتورها فقط ثبت ارجاع به سرویس‌های مالک هستند — داده تکراری ساخته نمی‌شود.
            </p>
            <div className="grid gap-2 sm:grid-cols-2">
              {[
                { href: "/hospitality/integrations/delivery", label: "پیک / Delivery" },
                { href: "/hospitality/integrations/crm", label: "CRM" },
                { href: "/hospitality/integrations/loyalty", label: "وفاداری" },
                { href: "/hospitality/integrations/communication", label: "ارتباطات" },
                { href: "/hospitality/integrations/accounting", label: "حسابداری" },
                { href: "/hospitality/qr/menu", label: "QR منو" },
                { href: "/hospitality/pos/register", label: "صندوق / پرداخت محلی" },
              ].map((l) => (
                <Link key={l.href} href={l.href}>
                  <Button variant="outline" className="w-full justify-start">
                    {l.label}
                  </Button>
                </Link>
              ))}
            </div>
            <Button onClick={() => setStep("checklist")}>رفتن به چک‌لیست</Button>
          </CardContent>
        </Card>
      ) : null}

      {step === "checklist" ? (
        <Card>
          <CardContent className="space-y-3 p-4">
            <p className="text-sm font-medium">پیشرفت راه‌اندازی: {doneCount}/{checklist.length}</p>
            <ul className="space-y-2">
              {checklist.map((c) => (
                <li
                  key={c.id}
                  className="flex flex-wrap items-center justify-between gap-2 rounded-xl border border-[var(--border)] px-3 py-2 text-sm"
                >
                  <span>
                    {c.done ? "✅" : "⬜"} {c.label}
                    {c.hint ? <span className="ms-2 text-xs text-[var(--muted)]">{c.hint}</span> : null}
                  </span>
                  <Link href={c.href} className="text-xs text-[var(--hospitality-accent)]">
                    باز کردن
                  </Link>
                </li>
              ))}
            </ul>
            <Link href="/hospitality">
              <Button>ورود به داشبورد</Button>
            </Link>
          </CardContent>
        </Card>
      ) : null}
    </div>
  );
}

export default RestaurantOnboardingPage;