"use client";

import { useState, useEffect } from "react";
import { PageLayout } from "@/components/layout/PageLayout";
import { ErrorBoundary } from "@/components/common";
import { SubCard } from "@/components/ui/sub-card";
import { useSession } from "@/features/auth/hooks";
import { useAuthStore } from "@/features/auth/services/auth.store";
// ApiClientError import removed - using generic error handling
import { apiClient } from "@/core/api";
import { openSsoLink } from "@/features/billing/utils/sso";
import { usePaymentRefresh } from "@/features/billing/hooks/usePaymentRefresh";
import { PaymentMethodCard, usePaymentMethods } from "@/features/billing";
import { CreditCardIcon, PlusIcon } from "@heroicons/react/24/outline";
import { InlineToast } from "@/components/ui/inline-toast";
import { SectionHeader } from "@/components/common";
import { Button } from "@/components/ui/button";
import { AsyncBlock } from "@/components/common/AsyncBlock";
import { LoadingCard, Skeleton } from "@/components/ui/loading-skeleton";
import { logger } from "@customer-portal/logging";
import { EmptyState } from "@/components/ui/empty-state";

export function PaymentMethodsContainer() {
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const { isAuthenticated } = useSession();

  const paymentMethodsQuery = usePaymentMethods();
  const {
    data: paymentMethodsData,
    isLoading: isLoadingPaymentMethods,
    isFetching: isFetchingPaymentMethods,
    error: paymentMethodsError,
  } = paymentMethodsQuery;

  // Auth hydration flag to avoid showing empty state before auth is checked
  const { hasCheckedAuth } = useAuthStore();

  const paymentRefresh = usePaymentRefresh({
    refetch: async () => {
      const result = await paymentMethodsQuery.refetch();
      return { data: result.data };
    },
    hasMethods: (data?: { totalCount?: number }) => !!data && (data.totalCount || 0) > 0,
    attachFocusListeners: true,
  });

  const openPaymentMethods = async () => {
    try {
      setIsLoading(true);
      setError(null);
      if (!isAuthenticated) {
        setError("Please log in to access payment methods.");
        setIsLoading(false);
        return;
      }
      const response = await apiClient.POST('/auth/sso-link', {
        body: { path: "index.php?rp=/account/paymentmethods" }
      });
      const sso = response.data!;
      openSsoLink(sso.url, { newTab: true });
      setIsLoading(false);
    } catch (error) {
      logger.error(error, "Failed to open payment methods");
      if (error && typeof error === 'object' && 'status' in error && (error as any).status === 401)
        setError("Authentication failed. Please log in again.");
      else setError("Unable to access payment methods. Please try again later.");
      setIsLoading(false);
    }
  };

  useEffect(() => {
    // Placeholder hook for future logic when returning from WHMCS
  }, [isAuthenticated]);

  if (error || paymentMethodsError) {
    const errorObj =
      error || (paymentMethodsError instanceof Error ? paymentMethodsError : new Error("Unexpected error"));
    return (
      <PageLayout
        icon={<CreditCardIcon />}
        title="Payment Methods"
        description="Manage your saved payment methods and billing information"
      >
        <AsyncBlock error={errorObj} variant="page">
          <></>
        </AsyncBlock>
      </PageLayout>
    );
  }

  return (
    <PageLayout
      icon={<CreditCardIcon />}
      title="Payment Methods"
      description="Manage your payment methods in the billing portal."
    >
      <ErrorBoundary>
        <InlineToast
        visible={paymentRefresh.toast.visible}
        text={paymentRefresh.toast.text}
        tone={paymentRefresh.toast.tone}
        />
      {/* Simplified: remove verbose banner; controls exist via buttons */}
      <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">
        <div className="lg:col-span-2">
          {!hasCheckedAuth || isLoadingPaymentMethods || isFetchingPaymentMethods ? (
            <>
              <LoadingCard />
              <SubCard>
                <div className="space-y-4">
                  {Array.from({ length: 2 }).map((_, i) => (
                    <div key={i} className="flex items-center justify-between">
                      <div className="flex items-center gap-3">
                        <Skeleton className="h-8 w-12" />
                        <div className="space-y-2">
                          <Skeleton className="h-4 w-40" />
                          <Skeleton className="h-3 w-24" />
                        </div>
                      </div>
                      <Skeleton className="h-9 w-28" />
                    </div>
                  ))}
                </div>
              </SubCard>
            </>
          ) : paymentMethodsData && paymentMethodsData.paymentMethods.length > 0 ? (
            <SubCard
              header={
                <SectionHeader title="Your Payment Methods">
                  <Button
                    onClick={() => {
                      void openPaymentMethods();
                    }}
                    disabled={isLoading}
                    size="sm"
                  >
                    <PlusIcon className="w-4 h-4" />
                    Manage Cards
                  </Button>
                </SectionHeader>
              }
            >
              <div className="space-y-4">
                {paymentMethodsData.paymentMethods.map(paymentMethod => (
                  <PaymentMethodCard
                    key={paymentMethod.id}
                    paymentMethod={paymentMethod}
                    className="focus:outline-none focus:ring-2 focus:ring-blue-500"
                    showActions={false}
                  />
                ))}
              </div>
            </SubCard>
          ) : (
            <SubCard>
              {(!hasCheckedAuth && !paymentMethodsData) ? (
                <AsyncBlock isLoading loadingText="Loading payment methods...">
                  <></>
                </AsyncBlock>
              ) : (
                <>
                  <EmptyState
                    icon={<CreditCardIcon className="h-12 w-12" />}
                    title="No Payment Methods"
                    description="Open the billing portal to add a card."
                    action={{
                      label: isLoading ? "Opening..." : "Manage Cards",
                      onClick: () => void openPaymentMethods(),
                    }}
                  />
                  <p className="text-sm text-gray-500 text-center">Opens in a new tab for security</p>
                </>
              )}
            </SubCard>
          )}
        </div>

        <div className="space-y-6">
          <div className="bg-blue-50 rounded-lg p-4">
            <div className="flex items-start">
              <div className="flex-shrink-0">
                <CreditCardIcon className="h-5 w-5 text-blue-400" />
              </div>
              <div className="ml-3">
                <h3 className="text-sm font-medium text-blue-800">Secure & Encrypted</h3>
                <p className="text-sm text-blue-700 mt-1">
                  All payment information is securely encrypted and protected with industry-standard
                  security.
                </p>
              </div>
            </div>
          </div>

          <div className="bg-gray-50 rounded-lg p-4">
            <h3 className="text-sm font-medium text-gray-800 mb-2">Supported Payment Methods</h3>
            <ul className="text-sm text-gray-600 space-y-1">
              <li>• Credit Cards (Visa, MasterCard, American Express)</li>
              <li>• Debit Cards</li>
            </ul>
          </div>
        </div>
      </div>
      </ErrorBoundary>
    </PageLayout>
  );
}

export default PaymentMethodsContainer;