"use client";

import { FormEvent, Suspense, useEffect, useMemo, useState } from "react";
import { useRouter, useSearchParams } from "next/navigation";
import { AuthGuard } from "@/components/AuthGuard";
import { Button, Container } from "@/components/ui";
import { api, ApiError, type TenantContext } from "@/lib/api";
import { useMe } from "@/hooks/useMe";
import { FeatureLock } from "@/modules/commercial/components";
import { evaluateDomainPolicy, loadWorkspaceSnapshot } from "@/modules/commercial/adapters";
import { commercialPost } from "@/modules/commercial/adapters/http";
import {
  loadAssessmentSession,
  saveAssessmentSession,
} from "@/modules/commercial/session";

type Step = "business" | "branding" | "domain" | "review";

const STEPS: { id: Step; label: string }[] = [
  { id: "business", label: "اطلاعات کسب‌وکار" },
  { id: "branding", label: "برندینگ" },
  { id: "domain", label: "دامنه" },
  { id: "review", label: "بازبینی و تکمیل" },
];

function slugify(value: string): string {
  return value
    .trim()
    .toLowerCase()
    .replace(/\s+/g, "-")
    .replace(/[^a-z0-9-]/g, "")
    .replace(/-+/g, "-")
    .replace(/^-|-$/g, "");
}

const inputClass =
  "mt-1 w-full rounded-xl border border-gray-200 px-4 py-2.5 focus:border-primary focus:outline-none focus:ring-1 focus:ring-primary disabled:bg-gray-50";

function StepIndicator({ current }: { current: Step }) {
  const currentIndex = STEPS.findIndex((s) => s.id === current);
  return (
    <ol className="flex flex-wrap items-center gap-2 text-xs sm:text-sm">
      {STEPS.map((step, index) => {
        const isActive = step.id === current;
        const isDone = index < currentIndex;
        return (
          <li key={step.id} className="flex items-center gap-2">
            <span
              className={`flex h-7 w-7 items-center justify-center rounded-full font-bold ${
                isActive
                  ? "bg-primary text-white"
                  : isDone
                    ? "bg-[var(--color-primary-muted)] text-primary"
                    : "bg-gray-100 text-gray-400"
              }`}
            >
              {index + 1}
            </span>
            <span className={isActive ? "font-semibold text-secondary" : "text-gray-500"}>
              {step.label}
            </span>
            {index < STEPS.length - 1 && <span className="mx-1 text-gray-300">/</span>}
          </li>
        );
      })}
    </ol>
  );
}

function OnboardingWizard() {
  const router = useRouter();
  const searchParams = useSearchParams();
  const intentParam = searchParams.get("intent");
  const { me, loading: meLoading } = useMe();

  const [step, setStep] = useState<Step>("business");
  const [ctx, setCtx] = useState<TenantContext | null>(null);
  const [bootstrapping, setBootstrapping] = useState(true);
  const [error, setError] = useState("");
  const [loading, setLoading] = useState(false);
  const [domainUnlocked, setDomainUnlocked] = useState(false);
  const [domainReason, setDomainReason] = useState<string | null>(null);

  const session = useMemo(() => loadAssessmentSession(), []);
  const [businessName, setBusinessName] = useState("");
  const [slug, setSlug] = useState("");
  const [slugTouched, setSlugTouched] = useState(false);
  const [businessType, setBusinessType] = useState(
    (typeof session.answers.business_type_code === "string"
      ? session.answers.business_type_code
      : intentParam) || ""
  );

  const [primaryColor, setPrimaryColor] = useState("#0284c7");
  const [secondaryColor, setSecondaryColor] = useState("#0f172a");
  const [logoUrl, setLogoUrl] = useState("");
  const [customDomain, setCustomDomain] = useState("");

  useEffect(() => {
    if (meLoading) return;
    if (!me) {
      setBootstrapping(false);
      return;
    }
    if (!me.onboarding_required) {
      router.replace("/dashboard");
      return;
    }
    if (me.current_tenant_id) {
      api.tenantContext
        .current()
        .then(async (tenantCtx) => {
          setCtx(tenantCtx);
          const snap = await loadWorkspaceSnapshot();
          if (snap.data) {
            setDomainUnlocked(snap.data.custom_domain_unlocked);
            setDomainReason(snap.data.domain_policy?.reason ?? null);
          } else {
            const pol = await evaluateDomainPolicy({
              tenant_id: tenantCtx.tenant.id,
              subscription_status: tenantCtx.subscription_status,
            });
            setDomainUnlocked(Boolean(pol.data.custom_domain_allowed));
            setDomainReason(pol.data.reason ?? null);
          }
          setStep("branding");
        })
        .catch(() => undefined)
        .finally(() => setBootstrapping(false));
    } else {
      setBootstrapping(false);
    }
  }, [me, meLoading, router]);

  const handleBusinessNameChange = (value: string) => {
    setBusinessName(value);
    if (!slugTouched) setSlug(slugify(value));
  };

  const handleCreateTenant = async (e: FormEvent) => {
    e.preventDefault();
    setError("");
    setLoading(true);
    try {
      const result = await api.onboarding.createTenant({
        business_name: businessName,
        slug,
        business_type: businessType || undefined,
      });
      setCtx(result);
      const pol = await evaluateDomainPolicy({
        tenant_id: result.tenant.id,
        subscription_status: result.subscription_status,
      });
      setDomainUnlocked(Boolean(pol.data.custom_domain_allowed));
      setDomainReason(pol.data.reason ?? null);
      saveAssessmentSession({
        ...loadAssessmentSession(),
        answers: {
          ...loadAssessmentSession().answers,
          business_type_code: businessType,
        },
      });
      setStep("branding");
    } catch (err) {
      setError(err instanceof ApiError ? err.message : "ایجاد workspace ناموفق بود");
    } finally {
      setLoading(false);
    }
  };

  const handleBranding = async (e: FormEvent) => {
    e.preventDefault();
    if (!ctx) return;
    setError("");
    setLoading(true);
    try {
      const result = await api.onboarding.updateBranding(ctx.tenant.id, {
        primary_color: primaryColor || undefined,
        secondary_color: secondaryColor || undefined,
        logo_url: logoUrl.trim() || undefined,
      });
      setCtx(result);
      setStep("domain");
    } catch (err) {
      setError(err instanceof ApiError ? err.message : "ذخیره برندینگ ناموفق بود");
    } finally {
      setLoading(false);
    }
  };

  const handleDomain = async (e: FormEvent) => {
    e.preventDefault();
    if (!ctx) return;
    setError("");
    setLoading(true);
    try {
      let result = ctx;
      if (customDomain.trim()) {
        if (!domainUnlocked) {
          setError(
            domainReason ||
              "دامنه اختصاصی بر اساس سیاست تجاری قفل است. از زیردامنه پلتفرم استفاده کنید."
          );
          setLoading(false);
          return;
        }
        result = await api.onboarding.updateDomain(ctx.tenant.id, {
          custom_domain: customDomain.trim(),
        });
        setCtx(result);
      }
      setStep("review");
    } catch (err) {
      setError(err instanceof ApiError ? err.message : "ثبت دامنه ناموفق بود");
    } finally {
      setLoading(false);
    }
  };

  const handleComplete = async () => {
    if (!ctx) return;
    setError("");
    setLoading(true);
    try {
      await api.onboarding.complete(ctx.tenant.id);
      const session = loadAssessmentSession();
      if (session.activate_trial || session.selected_bundle_code) {
        await commercialPost("/api/v1/commercial/subscriptions", {
          tenant_id: ctx.tenant.id,
          mode: "trial",
          status: "trialing",
          bundle_code: session.selected_bundle_code || undefined,
          answers: session.answers,
        }).catch(() => null);
      }
      router.push("/dashboard");
    } catch (err) {
      setError(err instanceof ApiError ? err.message : "تکمیل onboarding ناموفق بود");
      setLoading(false);
    }
  };

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

  const selectedBundle = loadAssessmentSession().selected_bundle_code;

  return (
    <Container className="py-10">
      <div className="mx-auto max-w-xl">
        <h1 className="text-2xl font-bold text-secondary">راه‌اندازی workspace</h1>
        <p className="mt-2 text-sm text-gray-600">پس از تکمیل به داشبورد تجاری هدایت می‌شوید.</p>
        <div className="mt-6">
          <StepIndicator current={step} />
        </div>
        {error ? (
          <p className="mt-4 rounded-lg bg-red-50 px-3 py-2 text-sm text-red-600">{error}</p>
        ) : null}

        <div className="mt-6 rounded-2xl border border-gray-100 bg-white p-6 shadow-sm">
          {step === "business" ? (
            <form onSubmit={handleCreateTenant} className="space-y-4">
              <label className="block text-sm font-medium text-secondary">
                نام کسب‌وکار
                <input
                  required
                  value={businessName}
                  onChange={(e) => handleBusinessNameChange(e.target.value)}
                  disabled={loading}
                  className={inputClass}
                  placeholder="مثلاً کافه تربت"
                />
              </label>
              <label className="block text-sm font-medium text-secondary">
                آدرس (slug) — زیردامنه
                <input
                  required
                  dir="ltr"
                  value={slug}
                  onChange={(e) => {
                    setSlugTouched(true);
                    setSlug(e.target.value);
                  }}
                  disabled={loading}
                  className={`${inputClass} font-mono`}
                  placeholder="cafe-torbat"
                />
              </label>
              <p className="text-xs text-gray-500" dir="ltr">
                {slug || "slug"}.torbatyar.ir
              </p>
              <label className="block text-sm font-medium text-secondary">
                نوع کسب‌وکار (از ارزیابی / metadata)
                <input
                  value={businessType}
                  onChange={(e) => setBusinessType(e.target.value)}
                  disabled={loading}
                  className={inputClass}
                  placeholder="کد نوع از رجیستری ارزیابی"
                />
              </label>
              {selectedBundle ? (
                <p className="rounded-xl bg-gray-50 px-3 py-2 text-xs text-secondary">
                  باندل session: <span className="font-mono">{selectedBundle}</span>
                </p>
              ) : null}
              <Button type="submit" className="w-full" loading={loading} loadingText="در حال ایجاد...">
                ادامه
              </Button>
            </form>
          ) : null}

          {step === "branding" && ctx ? (
            <form onSubmit={handleBranding} className="space-y-4">
              <label className="block text-sm font-medium text-secondary">
                رنگ اصلی
                <div className="mt-1 flex items-center gap-3">
                  <input
                    type="color"
                    value={primaryColor}
                    onChange={(e) => setPrimaryColor(e.target.value)}
                    disabled={loading}
                    className="h-10 w-14 cursor-pointer rounded border border-gray-200"
                  />
                  <input
                    dir="ltr"
                    value={primaryColor}
                    onChange={(e) => setPrimaryColor(e.target.value)}
                    disabled={loading}
                    className={`${inputClass} font-mono`}
                  />
                </div>
              </label>
              <label className="block text-sm font-medium text-secondary">
                رنگ ثانویه
                <div className="mt-1 flex items-center gap-3">
                  <input
                    type="color"
                    value={secondaryColor}
                    onChange={(e) => setSecondaryColor(e.target.value)}
                    disabled={loading}
                    className="h-10 w-14 cursor-pointer rounded border border-gray-200"
                  />
                  <input
                    dir="ltr"
                    value={secondaryColor}
                    onChange={(e) => setSecondaryColor(e.target.value)}
                    disabled={loading}
                    className={`${inputClass} font-mono`}
                  />
                </div>
              </label>
              <label className="block text-sm font-medium text-secondary">
                آدرس لوگو (اختیاری)
                <input
                  dir="ltr"
                  value={logoUrl}
                  onChange={(e) => setLogoUrl(e.target.value)}
                  disabled={loading}
                  className={inputClass}
                  placeholder="https://..."
                />
              </label>
              <Button type="submit" className="w-full" loading={loading} loadingText="در حال ذخیره...">
                ادامه
              </Button>
            </form>
          ) : null}

          {step === "domain" && ctx ? (
            <form onSubmit={handleDomain} className="space-y-4">
              <p className="rounded-xl bg-sky-50 px-3 py-2 text-xs text-sky-900">
                زیردامنه فعال:{" "}
                <span className="font-mono" dir="ltr">
                  {ctx.tenant.slug}.torbatyar.ir
                </span>
              </p>
              <FeatureLock
                locked={!domainUnlocked}
                reason={
                  domainReason ||
                  "دامنه اختصاصی بر اساس سیاست تجاری قفل است."
                }
                fallback={
                  <div className="rounded-xl border border-dashed border-gray-200 bg-gray-50 p-4 text-sm text-gray-600">
                    {domainReason ||
                      "دامنه اختصاصی قفل است — سیاست تجاری را در Billing/Admin بررسی کنید."}
                  </div>
                }
              >
                <label className="block text-sm font-medium text-secondary">
                  دامنه اختصاصی
                  <input
                    dir="ltr"
                    value={customDomain}
                    onChange={(e) => setCustomDomain(e.target.value)}
                    disabled={loading || !domainUnlocked}
                    className={inputClass}
                    placeholder="shop.example.com"
                  />
                </label>
              </FeatureLock>
              <Button type="submit" className="w-full" loading={loading} loadingText="در حال ذخیره...">
                ادامه
              </Button>
            </form>
          ) : null}

          {step === "review" && ctx ? (
            <div className="space-y-4">
              <div className="rounded-xl bg-gray-50 p-4 text-sm">
                <p>
                  <span className="text-gray-500">نام:</span> {ctx.tenant.name}
                </p>
                <p className="mt-1">
                  <span className="text-gray-500">slug:</span>{" "}
                  <span dir="ltr" className="font-mono">
                    {ctx.tenant.slug}
                  </span>
                </p>
              </div>
              <Button
                type="button"
                className="w-full"
                loading={loading}
                loadingText="در حال تکمیل..."
                onClick={handleComplete}
              >
                تکمیل و ورود به داشبورد تجاری
              </Button>
            </div>
          ) : null}
        </div>
      </div>
    </Container>
  );
}

export default function OnboardingPage() {
  return (
    <AuthGuard>
      <Suspense
        fallback={
          <Container className="py-16 text-center">
            <p className="text-sm text-gray-500">در حال بارگذاری...</p>
          </Container>
        }
      >
        <OnboardingWizard />
      </Suspense>
    </AuthGuard>
  );
}