"use client";

import { useMemo, useState } from "react";
import { useRouter } from "next/navigation";
import { useI18n } from "@/hooks/useI18n";
import { useDashboardStore } from "@/hooks/useDashboardStore";
import { UnlockProOverlay } from "@/components/subscription/UnlockProOverlay";

type ProFeaturePaywallProps = {
  feature: "today" | "history" | "future";
  onClose?: () => void;
};

export function ProFeaturePaywall({ feature, onClose }: ProFeaturePaywallProps) {
  const router = useRouter();
  const { locale } = useI18n();
  const { proAccess } = useDashboardStore();
  const [usePoints, setUsePoints] = useState(true);

  const isEn = locale === "en-US";
  const pointsAvailable = Number(proAccess.points || 0);

  const PRO_PRICE_USD = 5;
  const POINTS_PER_USD = 500;
  const MAX_DISCOUNT_USD = 3;

  const billing = useMemo(() => {
    const isEligible = pointsAvailable >= POINTS_PER_USD;
    const maxRedeemablePoints = MAX_DISCOUNT_USD * POINTS_PER_USD;
    const boundedPoints = isEligible
      ? Math.min(pointsAvailable, maxRedeemablePoints)
      : 0;
    const discountUnits = Math.floor(boundedPoints / POINTS_PER_USD);
    const pointsUsed = discountUnits * POINTS_PER_USD;
    const discountAmount = usePoints ? discountUnits : 0;

    return {
      pointsEnabled: true,
      isEligible,
      pointsPerUsd: POINTS_PER_USD,
      maxDiscountUsd: MAX_DISCOUNT_USD,
      pointsUsed: usePoints ? pointsUsed : 0,
      discountAmount,
      finalPrice: PRO_PRICE_USD - discountAmount,
    };
  }, [pointsAvailable, usePoints]);

  const payLabel = isEn
    ? feature === "history"
      ? "Unlock History in Account"
      : feature === "future"
        ? "Unlock Forecast in Account"
        : "Unlock Intraday in Account"
    : feature === "history"
      ? "去账户中心解锁历史功能"
      : feature === "future"
        ? "去账户中心解锁未来分析"
        : "去账户中心解锁今日日内";

  return (
    <div className="flex w-full flex-col items-center justify-center py-6 md:py-10 z-30 p-4">
      <UnlockProOverlay
        locale={locale}
        points={pointsAvailable}
        planPriceUsd={PRO_PRICE_USD}
        usePoints={usePoints}
        onToggleUsePoints={() => setUsePoints((prev) => !prev)}
        billing={billing}
        onClose={onClose}
        onPay={() => router.push("/account")}
        payLabel={payLabel}
        faqHref="/account"
      />
    </div>
  );
}