"use client";

import { useQuery } from "@tanstack/react-query";
import { useTenantId } from "@/hooks/useTenantId";
import { paymentApi } from "@/modules/payment/services/payment-api";
import { usePaymentMetrics } from "@/modules/payment/hooks/usePaymentCapabilities";
import { PaymentPageLoader, PaymentPageError } from "@/modules/payment/pages/shared";
import { PageHeader, Card, CardContent } from "@/components/ds";
import {
  PaymentBarChart,
  PaymentDonutChart,
  PaymentStatCards,
} from "@/modules/payment/components/PaymentCharts";

export const PaymentKpis = function PaymentKpisPage() {
  const { tenantId } = useTenantId();
  const metrics = usePaymentMetrics();

  const kpiQ = useQuery({
    queryKey: ["payment", tenantId, "kpis"],
    queryFn: async () => {
      const [requests, transactions] = await Promise.all([
        paymentApi.requests.list(tenantId!),
        paymentApi.transactions.list(tenantId!),
      ]);
      const byStatus: Record<string, number> = {};
      for (const r of requests) {
        const s = String(r.status ?? "unknown");
        byStatus[s] = (byStatus[s] ?? 0) + 1;
      }
      const totalAmount = requests.reduce((sum, r) => sum + Number(r.amount_minor ?? 0), 0);
      const paidCount = requests.filter((r) => r.status === "paid").length;
      const successRate = requests.length ? Math.round((paidCount / requests.length) * 100) : 0;
      return {
        totalRequests: requests.length,
        totalTransactions: transactions.length,
        totalAmount,
        successRate,
        statusChart: Object.entries(byStatus).map(([name, value]) => ({ name, value })),
        sourceChart: Object.entries(
          requests.reduce<Record<string, number>>((acc, r) => {
            const k = String(r.payment_source ?? "unknown");
            acc[k] = (acc[k] ?? 0) + 1;
            return acc;
          }, {})
        ).map(([name, value]) => ({ name, value })),
      };
    },
    enabled: !!tenantId,
  });

  if (!tenantId || kpiQ.isLoading || metrics.isLoading) return <PaymentPageLoader />;
  if (kpiQ.error) return <PaymentPageError error={kpiQ.error} onRetry={() => kpiQ.refetch()} />;

  const k = kpiQ.data!;

  return (
    <div className="space-y-6">
      <PageHeader title="شاخص‌های کلیدی" description="نرخ موفقیت، حجم و توزیع وضعیت درخواست‌ها." />
      <PaymentStatCards
        items={[
          { label: "کل درخواست‌ها", value: k.totalRequests },
          { label: "تراکنش‌های ثبت‌شده", value: k.totalTransactions },
          { label: "نرخ موفقیت", value: `${k.successRate}%` },
          { label: "مجموع مبلغ (ریال)", value: k.totalAmount.toLocaleString("fa-IR") },
        ]}
      />
      <div className="grid gap-4 lg:grid-cols-2">
        <Card>
          <CardContent className="p-4">
            <h3 className="mb-4 text-sm font-semibold">توزیع وضعیت</h3>
            <PaymentDonutChart data={k.statusChart} />
          </CardContent>
        </Card>
        <Card>
          <CardContent className="p-4">
            <h3 className="mb-4 text-sm font-semibold">منبع پرداخت</h3>
            <PaymentBarChart data={k.sourceChart} />
          </CardContent>
        </Card>
      </div>
      {metrics.data?.metrics ? (
        <Card>
          <CardContent className="p-4">
            <h3 className="mb-2 text-sm font-semibold">متریک‌های سرویس</h3>
            <pre className="overflow-x-auto text-xs">{JSON.stringify(metrics.data.metrics, null, 2)}</pre>
          </CardContent>
        </Card>
      ) : null}
    </div>
  );
};

export default PaymentKpis;