"use client";

import Link from "next/link";
import {
  ArrowRight,
  BellRing,
  CheckCircle2,
  Coins,
  Crown,
  ExternalLink,
  Loader2,
  Lock,
  MessageSquare,
  Radar,
  Send,
  Sparkles,
  TrendingUp,
  Wallet,
  X,
  Zap,
} from "lucide-react";
import s from "./UnlockProOverlay.module.css";

const DEFAULT_FAQ_HREF = "/subscription-help";
const DEFAULT_TELEGRAM_GROUP_URL = "";

export type UnlockProBilling = {
  pointsEnabled: boolean;
  isEligible: boolean;
  pointsUsed: number;
  discountAmount: number;
  finalPrice: number;
  maxDiscountUsd: number;
  pointsPerUsd: number;
};

type UnlockProOverlayProps = {
  points: number;
  planPriceUsd: number;
  planLabel?: string;
  periodLabel?: string;
  usePoints: boolean;
  billing: UnlockProBilling;
  onToggleUsePoints: () => void;
  onPay: () => void;
  onManualPay?: () => void;
  onClose?: () => void;
  payBusy?: boolean;
  payLabel?: string;
  manualPayLabel?: string;
  locale?: "zh-CN" | "en-US";
  errorText?: string;
  infoText?: string;
  faqHref?: string;
  telegramGroupUrl?: string;
  txHash?: string;
  chainId?: number;
  paymentTokenLabel?: string;
};

function formatUsdcAmount(value: number) {
  if (!Number.isFinite(value)) return "0";
  return value.toFixed(2).replace(/\.?0+$/, "");
}

const FEATURES = {
  "zh-CN": [
    "Terminal：市场温度与城市机会扫描",
    "机场 / 跑道实测：METAR + 结算源优先",
    "DEB 路径与高温时段复核",
    "Telegram 提醒与账户权益同步",
  ],
  "en-US": [
    "Terminal: market temperature and city signal scanning",
    "Airport / runway observations: METAR + settlement-source-first",
    "DEB paths and peak-temperature window review",
    "Telegram alerts and entitlement sync",
  ],
};

export function UnlockProOverlay({
  points,
  planPriceUsd,
  planLabel,
  periodLabel,
  usePoints,
  billing,
  onToggleUsePoints,
  onPay,
  onManualPay,
  onClose,
  payBusy = false,
  payLabel,
  manualPayLabel,
  locale = "zh-CN",
  errorText,
  infoText,
  faqHref = DEFAULT_FAQ_HREF,
  telegramGroupUrl = DEFAULT_TELEGRAM_GROUP_URL,
  txHash,
  chainId = 137,
  paymentTokenLabel,
}: UnlockProOverlayProps) {
  const isEn = locale === "en-US";
  const canUsePoints = billing.pointsEnabled && billing.isEligible;
  const featureList = FEATURES[locale] ?? FEATURES["zh-CN"];
  const currencyLabel = "USDC";
  const formattedPlanPrice = formatUsdcAmount(planPriceUsd);
  const formattedFinalPrice = formatUsdcAmount(billing.finalPrice);
  const formattedDiscount = formatUsdcAmount(billing.discountAmount);
  const formattedMaxDiscount = formatUsdcAmount(billing.maxDiscountUsd);
  const resolvedPlanLabel = planLabel || "Standard Pro";
  const resolvedPeriodLabel = periodLabel || (isEn ? "/ 30 days" : "/ 30 天");
  const finalPayLabel =
    payLabel || (isEn ? "Subscribe & Activate" : "立即订阅并激活服务");

  const maxDiscountUsdInt = Math.max(1, Math.floor(billing.maxDiscountUsd || 0));
  const maxPointsForFullDiscount = Math.max(
    billing.pointsPerUsd,
    billing.pointsPerUsd * maxDiscountUsdInt,
  );
  const redeemableUsdNow = billing.pointsEnabled
    ? Math.min(maxDiscountUsdInt, Math.floor(points / Math.max(1, billing.pointsPerUsd)))
    : 0;
  const formattedRedeemableNow = formatUsdcAmount(redeemableUsdNow);
  const formattedMaxDiscountInt = formatUsdcAmount(maxDiscountUsdInt);
  const progressPct = billing.pointsEnabled
    ? Math.min(100, Math.round((points / maxPointsForFullDiscount) * 100))
    : 0;
  const resolvedTelegramGroupUrl = String(telegramGroupUrl || "").trim();
  const txHref =
    txHash && txHash.startsWith("0x")
      ? `${chainId === 137 ? "https://polygonscan.com" : "https://etherscan.io"}/tx/${txHash}`
      : "";

  return (
    <div className={s.modal}>
      {/* Ambient glows */}
      <div className={s.glowLeft} />
      <div className={s.glowRight} />
      <div className={s.topLine} />

      {/* Close button */}
      {onClose && (
        <button
          onClick={onClose}
          className={s.closeBtn}
          title={isEn ? "Close" : "关闭"}
        >
          <X size={15} />
        </button>
      )}

      {/* ── Header ── */}
      <div className={s.header}>
        <div className={s.badge}>
          <Crown size={12} style={{ color: "#fbbf24" }} />
          <span className={s.badgeText}>Pro</span>
        </div>
        <h2 className={s.title}>
          {isEn ? "Activate PolyWeather Pro" : "确认开通 PolyWeather Pro"}
        </h2>
        <p className={s.subtitle}>
          {isEn
            ? "Confirm your subscription for the settlement-source-first terminal: observations, DEB paths, city charts, and alerts."
            : "确认订阅结算源优先的天气决策终端：实测观测、DEB 路径、城市图表和提醒。"}
        </p>
      </div>

      {/* ── Cards ── */}
      <div className={s.grid}>
        {/* Left: Plan card */}
        <div className={s.planCard}>
          <span className={s.planChip}>
            <Zap size={10} />
            {resolvedPlanLabel}
          </span>

          <div
            style={{
              display: "flex",
              alignItems: "baseline",
              gap: 4,
              marginTop: 12,
            }}
          >
            <span className={s.price}>{formattedPlanPrice}</span>
            <span className={s.priceSuffix}>{currencyLabel} {resolvedPeriodLabel}</span>
          </div>

          <ul className={s.featureList}>
            {featureList.map((item, i) => (
              <li key={i} className={s.featureItem}>
                <span className={s.featureIcon}>
                  <CheckCircle2 size={11} />
                </span>
                {item}
              </li>
            ))}
          </ul>
        </div>

        {/* Right: Points card */}
        {canUsePoints ? (
          <div
            className={`${s.pointsCard} ${usePoints ? s.pointsCardActive : ""}`}
          >
            {/* Header row */}
            <div className={s.pointsHeader}>
              <div className={s.pointsLabelRow}>
                <div
                  className={`${s.pointsIconBox} ${usePoints ? s.pointsIconBoxActive : ""}`}
                >
                  <Coins size={13} />
                </div>
                <span
                  className={`${s.pointsLabel} ${usePoints ? s.pointsLabelActive : ""}`}
                >
                  {isEn ? "Points Credit" : "积分抵扣"}
                </span>
              </div>
              <button
                onClick={onToggleUsePoints}
                className={`${s.toggle} ${usePoints ? s.toggleActive : ""}`}
                title={isEn ? "Toggle points" : "切换积分"}
              >
                <div
                  className={`${s.toggleThumb} ${usePoints ? s.toggleThumbActive : ""}`}
                />
              </button>
            </div>

            {/* Discount amount */}
            <div style={{ display: "flex", alignItems: "baseline" }}>
              <span
                className={`${s.discount} ${usePoints ? s.discountActive : ""}`}
              >
                -{formattedDiscount}
              </span>
              <span className={s.discountSuffix}>{currencyLabel}</span>
            </div>

            <p className={s.pointsNote}>
              {usePoints
                ? isEn
                  ? `Using ${billing.pointsUsed} pts · saves ${formattedDiscount} ${currencyLabel}`
                  : `已消耗 ${billing.pointsUsed} 积分 · 省 ${formattedDiscount} ${currencyLabel}`
                : isEn
                  ? `Toggle to save up to ${formattedMaxDiscount} ${currencyLabel}`
                  : `开启可最多抵扣 ${formattedMaxDiscount} ${currencyLabel}`}
            </p>
            <p className={s.pointsNote}>
              {isEn
                ? `Now redeemable: ${formattedRedeemableNow} / ${formattedMaxDiscountInt} ${currencyLabel}`
                : `当前可抵：${formattedRedeemableNow} / ${formattedMaxDiscountInt} ${currencyLabel}`}
            </p>

            <div className={s.pointsBalance}>
              <Sparkles size={11} />
              <span>
                {isEn ? "Balance:" : "当前积分："}{" "}
                <span
                  className={`${s.balanceNum} ${usePoints ? s.balanceNumActive : ""}`}
                >
                  {points}
                </span>
              </span>
            </div>
          </div>
        ) : (
          /* Not eligible */
          <div className={s.pointsUnavailableCard}>
            <div className={s.unavailChip}>
              <div className={s.unavailChipIcon}>
                <Coins size={12} />
              </div>
              <span className={s.unavailChipLabel}>
                {!billing.pointsEnabled
                  ? isEn
                    ? "Points Disabled"
                    : "积分未开启"
                  : isEn
                    ? "Insufficient Points"
                    : "积分不足"}
              </span>
            </div>

            <h4 className={s.unavailTitle}>
              {isEn ? "Earn Points & Save" : "赚取积分，抵扣订阅"}
            </h4>
            <p className={s.unavailDesc}>
              {!billing.pointsEnabled
                ? isEn
                  ? "Points redemption is unavailable for this plan."
                  : "当前套餐暂不支持积分抵扣。"
                : isEn
                  ? `Starts at ${billing.pointsPerUsd} pts, ${billing.pointsPerUsd} pts per 1 ${currencyLabel}, up to ${formattedMaxDiscountInt} ${currencyLabel}. You have: ${points}`
                  : `满 ${billing.pointsPerUsd} 分起兑，每 ${billing.pointsPerUsd} 分抵 1 ${currencyLabel}，最多抵 ${formattedMaxDiscountInt} ${currencyLabel}。当前 ${points} 分`}
            </p>

            {billing.pointsEnabled && (
              <div className={s.progressWrap}>
                <div className={s.progressHeader}>
                  <span>
                    {points} / {maxPointsForFullDiscount}
                  </span>
                  <span>
                    {isEn
                      ? `${formattedRedeemableNow} / ${formattedMaxDiscountInt} ${currencyLabel}`
                      : `${formattedRedeemableNow} / ${formattedMaxDiscountInt} ${currencyLabel}`}
                  </span>
                </div>
                <div className={s.progressTrack}>
                  <div
                    className={s.progressFill}
                    style={{ width: `${progressPct}%` }}
                  />
                </div>
              </div>
            )}

            <div style={{ marginTop: "auto", paddingTop: 16 }}>
              {resolvedTelegramGroupUrl ? (
                <Link
                  href={resolvedTelegramGroupUrl}
                  target="_blank"
                  className={s.unavailCta}
                >
                  <MessageSquare size={12} />
                  {isEn
                    ? "Invite paid users to earn points"
                    : "邀请付费用户即可获得积分"}
                  <ArrowRight size={11} />
                </Link>
              ) : (
                <span className={s.unavailCta} style={{ cursor: "default" }}>
                  <MessageSquare size={12} />
                  {isEn
                    ? "Invite paid users to earn points"
                    : "邀请付费用户即可获得积分"}
                </span>
              )}
            </div>
          </div>
        )}
      </div>

      {/* ── Payment summary ── */}
      <div className={s.summaryBox}>
        <div className={s.summaryRow}>
          <div>
            <p className={s.summaryLabel}>
              {isEn ? "Total Due Today" : "今日应付"}
            </p>
            {paymentTokenLabel && (
              <p className={s.summaryOriginal}>
                {isEn ? "Token" : "支付币种"}: {paymentTokenLabel}
              </p>
            )}
            {billing.discountAmount > 0 && usePoints && (
              <p className={s.summaryOriginal}>
                {formattedPlanPrice} {currencyLabel}
              </p>
            )}
          </div>
          <div className={s.summaryAmount}>
            <span className={s.summaryPrice}>
              {formattedFinalPrice}
            </span>
            <span className={s.summaryUnit}>{currencyLabel}</span>
          </div>
        </div>

        <div className={s.summaryDivider} />

        <div className={s.ctaWrap}>
          <button onClick={onPay} disabled={payBusy} className={s.ctaBtn}>
            {payBusy ? (
              <Loader2 size={18} className="animate-spin" />
            ) : (
              <>
                <Wallet size={17} />
                {finalPayLabel}
                <ArrowRight size={17} />
              </>
            )}
          </button>
          {onManualPay ? (
            <button
              onClick={onManualPay}
              disabled={payBusy}
              className={s.ctaBtn}
              style={{
                marginTop: 10,
                background: "rgba(15, 23, 42, 0.78)",
                border: "1px solid rgba(148, 163, 184, 0.28)",
              }}
            >
              {payBusy ? (
                <Loader2 size={18} className="animate-spin" />
              ) : (
                <>
                  <Wallet size={17} />
                  {manualPayLabel || (isEn ? "Manual transfer" : "手动转账")}
                  <ArrowRight size={17} />
                </>
              )}
            </button>
          ) : null}
          {onManualPay ? (
            <p
              style={{
                marginTop: 10,
                color: "rgba(203, 213, 225, 0.72)",
                fontSize: 12,
                lineHeight: 1.5,
                textAlign: "center",
              }}
            >
              {isEn
                ? "Choose one payment method only. Do not pay again after the order is completed."
                : "请只选择一种支付方式；订单完成后请勿重复付款。"}
            </p>
          ) : null}
        </div>
      </div>

      {/* ── Footer ── */}
      <div className={s.footer}>
        <span style={{ display: "inline-flex", alignItems: "center", gap: 5 }}>
          <Lock size={11} />
          {isEn ? "Secure Payment" : "安全付款"}
        </span>
        <span style={{ color: "#0f172a" }}>·</span>
        <Link href={faqHref} className={s.footerLink}>
          <BellRing size={11} />
          {isEn ? "Subscription FAQ" : "订阅说明"}
        </Link>
      </div>

      {/* ── Error / Info ── */}
      {errorText && (
        <div className={s.alertError}>
          <div className={`${s.alertIconBox} ${s.alertIconError}`}>
            <X size={10} />
          </div>
          {errorText}
        </div>
      )}
      {infoText && (
        <div className={s.alertInfo}>
          <div className={`${s.alertIconBox} ${s.alertIconInfo}`}>
            <CheckCircle2 size={10} />
          </div>
          <div>
            <div>{infoText}</div>
            {txHref && (
              <Link href={txHref} target="_blank" className={s.txLink}>
                {isEn ? "View on-chain transaction" : "查看链上交易"}
                <ExternalLink size={11} />
              </Link>
            )}
          </div>
        </div>
      )}
    </div>
  );
}