import React, { useState, useEffect, useMemo } from 'react';
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
import { CreditCardIcon } from '@heroicons/react/24/outline';
import { CheckCircleIcon } from '@heroicons/react/24/solid';
import { toast } from 'sonner';
import { api } from '../lib/api';
import type { ApiResponse } from '../lib/api';
import type { SubscriptionPlan, MySubscriptionData, SubscriptionPeriod } from '../types';
import { usePaymentConfig } from '../hooks/usePaymentConfig';
import { formatRial, formatNumber, formatDate } from '../lib/utils';
import Modal from '../components/ui/Modal';
import SettingsLayout from '../components/layout/SettingsLayout';
import {
  SparkleIcon, PlanCardPerson, CloseCircleFilled, GiftIcon, InfoCircleRedFilled,
} from './subscriptionIcons';

// ── Constants ─────────────────────────────────────────────────────────────

/** Shared feature labels (also consumed by PaymentSuccessPage). */
export const PLAN_FEATURE_LABELS: Record<string, string> = {
  patient_records: 'پرونده بیمار',
  services:        'مدیریت سرویس‌ها',
  sms_panel:       'پنل پیامک',
  insurance:       'مدیریت بیمه',
};

/** Feature labels used on the plan cards — wording copied from clinic-pro-tauri. */
const CARD_FEATURE_LABELS: Record<string, string> = {
  patient_records: 'مدیریت پرونده بیمار',
  services:        'مدیریت سرویس ها',
  sms_panel:       'پنل پیامک',
  insurance:       'مدیریت بیمه',
};

/** The plan highlighted as "most popular" in the UI (no backend flag exists);
 *  matches clinic-pro-tauri, which flags the professional (top) plan. */
const POPULAR_PLAN_NAME = 'professional';

const PLAN_META: Record<string, { label: string; desc: string; tint: string }> = {
  free:         { label: 'رایگان',  desc: 'مناسب برای شروع کار',              tint: 'var(--surface-2)' },
  basic:        { label: 'پایه',    desc: 'مناسب برای مطب‌های کوچک و متوسط',   tint: 'var(--primary-soft)' },
  professional: { label: 'حرفه‌ای', desc: 'مناسب برای کلینیک‌های بزرگ',        tint: 'var(--violet-bg)' },
};

/** Gradient blur behind each plan card — matches the tauri source per plan tier. */
const PLAN_GRADIENT: Record<string, string> = {
  free:         'radial-gradient(circle, var(--violet-bg) 0%, var(--primary-soft) 70%, transparent 100%)',
  basic:        'radial-gradient(circle, var(--success-bg) 0%, var(--violet-bg) 60%, transparent 100%)',
  professional: 'linear-gradient(180deg, var(--warning-bg) 0%, var(--primary-soft) 0%, transparent 100%)',
};

export const planMetaOf = (name: string) => PLAN_META[name] ?? PLAN_META.free;

// ── Main Page ─────────────────────────────────────────────────────────────

export default function SubscriptionPage() {
  const qc = useQueryClient();
  const [purchaseTarget, setPurchaseTarget] = useState<{ period: SubscriptionPeriod; planName: string } | null>(null);
  const [selectedGateway, setSelectedGateway] = useState<string>('');

  const { data: plansData, isLoading: plansLoading } = useQuery<ApiResponse<SubscriptionPlan[]>>({
    queryKey: ['subscription-plans'],
    queryFn: () => api.get('/api/v1/subscription/plans'),
  });

  const { data: myData, isLoading: myLoading } = useQuery<ApiResponse<MySubscriptionData>>({
    queryKey: ['subscription-my'],
    queryFn: () => api.get('/api/v1/subscription/my'),
  });

  const { isTestMode, gateways } = usePaymentConfig();

  useEffect(() => {
    if (gateways.length > 0 && !gateways.some((g) => g.name === selectedGateway)) {
      setSelectedGateway(gateways[0].name);
    }
  }, [gateways, selectedGateway]);

  // Highest plan first so, under RTL, the top-tier plan sits on the right (source order).
  const plans     = [...(plansData?.data ?? [])].sort((a, b) => b.level - a.level);
  const myRaw     = myData?.data;
  const my        = myRaw?.subscription ?? null;
  const usedTrial = myRaw?.used_trial ?? false;

  const trialMutation = useMutation({
    mutationFn: () => api.post('/api/v1/subscription/trial', {}),
    onSuccess: () => {
      qc.invalidateQueries({ queryKey: ['subscription-my'] });
      toast.success('تریال رایگان با موفقیت فعال شد');
    },
    onError: (err: any) => toast.error(err.message),
  });

  const purchaseMutation = useMutation({
    mutationFn: ({ period_uuid, gateway, amount_rials }: { period_uuid: string; gateway: string; amount_rials: number }) =>
      api.post<{ data: { pay_url?: string; redirect_url?: string; payment_url?: string } }>('/api/v1/subscription-payment', {
        period_uuid, gateway, amount_rials,
        // Gateway returns here (with ?payment_uuid&status); the success page reads them.
        frontend_address: `${window.location.origin}/admin/subscription/success`,
      }),
    onSuccess: (res: any) => {
      const url = res?.data?.pay_url ?? res?.data?.redirect_url ?? res?.data?.payment_url;
      if (url) window.location.href = url;
      else toast.error('خطا در دریافت لینک پرداخت');
    },
    onError: (err: any) => toast.error(err.message),
  });

  // Open the payment modal for the current plan's best-value paid period (renew).
  const renewCurrentPlan = () => {
    const current = plans.find((p) => p.name === my?.plan.name);
    const paid = (current?.periods ?? []).filter((p) => !p.is_trial)
      .sort((a, b) => a.duration_months - b.duration_months);
    const period = paid[paid.length - 1];
    if (period) setPurchaseTarget({ period, planName: current!.name });
  };

  return (
    <>
      <SettingsLayout active="subscription">
        <div
          style={{ background: 'var(--surface)', minWidth: 0 }}
          className="px-4 py-4 md:px-6 md:py-6 rounded-[var(--r-lg)]"
        >
          <div dir="ltr" style={{ width: '100%', display: 'flex', flexDirection: 'column', gap: 32, paddingTop: 8 }}>
            {/* ── Header: current plan (left) + title (right) ── */}
            <div style={{ display: 'flex', width: '100%', justifyContent: 'space-between', alignItems: 'center', gap: 16, flexWrap: 'wrap' }}>
              {!myLoading && <CurrentPlanCard my={my} onRenew={renewCurrentPlan} />}
              <div>
                <div style={{ fontSize: 22, fontWeight: 800, color: 'var(--text)' }}>انتخاب پلن اشتراک</div>
                <div style={{ fontSize: 14, fontWeight: 500, color: 'var(--text-3)', marginTop: 4, textAlign: 'left' }}>
                  پلن اشتراک مناسب خود را انتخاب نمایید:
                </div>
              </div>
            </div>

            {/* ── Plan cards ── */}
            {plansLoading ? (
              <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(230px, 1fr))', gap: 16, width: '100%' }}>
                {[1, 2, 3].map((i) => (
                  <div key={i} className="skeleton" style={{ height: 522, borderRadius: 10 }} />
                ))}
              </div>
            ) : plans.length === 0 ? (
              <div style={{ padding: '48px 0', textAlign: 'center', color: 'var(--text-3)', fontSize: 14 }}>
                در حال حاضر پلنی برای نمایش وجود ندارد.
              </div>
            ) : (
              <div style={{ display: 'grid', gridTemplateColumns: 'repeat(auto-fit, minmax(230px, 1fr))', gap: 16, width: '100%' }}>
                {plans.map((plan) => (
                  <PlanCard
                    key={plan.uuid}
                    plan={plan}
                    currentPlanName={my?.plan.name ?? 'free'}
                    currentPlanLevel={my?.plan.level ?? 0}
                    currentPlanActive={!!my && (my.days_remaining ?? 0) > 0}
                    usedTrial={usedTrial}
                    onPurchase={(period) => setPurchaseTarget({ period, planName: plan.name })}
                    onTrial={() => trialMutation.mutate()}
                    trialPending={trialMutation.isPending}
                  />
                ))}
              </div>
            )}
          </div>
        </div>
      </SettingsLayout>

      {/* ── Payment modal (gateway selection) ── */}
      <Modal
        open={!!purchaseTarget}
        onClose={() => { setPurchaseTarget(null); setSelectedGateway(gateways[0]?.name ?? ''); }}
        title="پرداخت اشتراک"
        size="sm"
      >
        {purchaseTarget && (
          <div style={{ display: 'flex', flexDirection: 'column', gap: 20 }}>
            <div style={{
              background: 'var(--surface-2)', borderRadius: 'var(--r-sm)',
              padding: '14px 16px', display: 'flex', justifyContent: 'space-between', alignItems: 'center',
            }}>
              <div>
                <div style={{ fontSize: 13, color: 'var(--text-3)', marginBottom: 2 }}>دوره انتخابی</div>
                <div style={{ fontWeight: 700, fontSize: 15 }}>
                  {planMetaOf(purchaseTarget.planName).label} — {purchaseTarget.period.label}
                </div>
                <div style={{ fontSize: 12, color: 'var(--text-3)', marginTop: 1 }}>
                  {formatNumber(purchaseTarget.period.duration_months)} ماه
                </div>
              </div>
              <div style={{ textAlign: 'left' }}>
                <div style={{ fontSize: 12, color: 'var(--text-3)', marginBottom: 2 }}>مبلغ قابل پرداخت</div>
                <div style={{ fontWeight: 800, fontSize: 20, color: 'var(--primary)' }}>
                  {formatRial(purchaseTarget.period.price_rials)}
                </div>
              </div>
            </div>

            {isTestMode ? (
              <div style={{
                background: 'var(--warning-bg)', border: '1px solid var(--warning)',
                borderRadius: 10, padding: '12px 16px', display: 'flex', alignItems: 'center', gap: 10,
              }}>
                <span style={{ fontSize: 20 }}>⚠️</span>
                <div>
                  <div style={{ fontWeight: 700, fontSize: 13.5, color: 'var(--warning)' }}>درگاه آزمایشی فعال است</div>
                  <div style={{ fontSize: 12, color: 'var(--warning)', marginTop: 2, opacity: 0.8 }}>پول واقعی کسر نخواهد شد — این تراکنش آزمایشی است</div>
                </div>
              </div>
            ) : gateways.length === 0 ? (
              <div style={{
                background: 'var(--danger-bg)', border: '1px solid var(--danger)',
                borderRadius: 10, padding: '12px 16px', fontSize: 13, color: 'var(--danger)',
              }}>
                در حال حاضر هیچ درگاه پرداخت فعالی وجود ندارد. لطفاً با پشتیبانی تماس بگیرید.
              </div>
            ) : (
              <div>
                <div style={{ fontSize: 12.5, fontWeight: 600, color: 'var(--text-2)', marginBottom: 10 }}>
                  انتخاب درگاه پرداخت
                </div>
                <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: 10 }}>
                  {gateways.map((gw) => (
                    <button
                      key={gw.name}
                      onClick={() => setSelectedGateway(gw.name)}
                      style={{
                        padding: '12px 16px', borderRadius: 'var(--r-sm)', cursor: 'pointer',
                        border: `2px solid ${selectedGateway === gw.name ? 'var(--primary)' : 'var(--border)'}`,
                        background: selectedGateway === gw.name ? 'var(--primary-soft)' : 'var(--surface)',
                        color: selectedGateway === gw.name ? 'var(--primary-700)' : 'var(--text-2)',
                        fontWeight: selectedGateway === gw.name ? 700 : 500,
                        fontSize: 13, transition: '.14s', fontFamily: 'inherit',
                        display: 'flex', alignItems: 'center', gap: 8,
                      }}
                    >
                      <CreditCardIcon style={{ width: 17, flexShrink: 0 }} />
                      {gw.label}
                    </button>
                  ))}
                </div>
              </div>
            )}

            <div style={{ display: 'flex', gap: 10, marginTop: 4 }}>
              <button
                className="btn primary"
                style={{ flex: 1, height: 44 }}
                disabled={purchaseMutation.isPending || (!isTestMode && (gateways.length === 0 || selectedGateway === ''))}
                onClick={() =>
                  purchaseMutation.mutate({ period_uuid: purchaseTarget.period.uuid, gateway: selectedGateway, amount_rials: purchaseTarget.period.price_rials })
                }
              >
                {purchaseMutation.isPending
                  ? 'در حال انتقال...'
                  : `پرداخت ${formatRial(purchaseTarget.period.price_rials)}`}
              </button>
              <button className="btn ghost" style={{ height: 44 }} onClick={() => setPurchaseTarget(null)}>
                انصراف
              </button>
            </div>
          </div>
        )}
      </Modal>
    </>
  );
}

// ── Current plan card (365×104, ported from tauri CurrentPlanCard.jsx) ───────

function CurrentPlanCard({ my, onRenew }: { my: MySubscriptionData['subscription']; onRenew: () => void }) {
  const daysLeft = my?.days_remaining ?? 0;
  const expiresAt = my?.expires_at ?? null;
  return (
    <div
      dir="rtl"
      style={{
        width: 365, maxWidth: '100%', minHeight: 104,
        background: 'var(--surface-2)', border: '1px solid var(--border)',
        borderRadius: 16, display: 'flex', flexDirection: 'column', justifyContent: 'center',
        padding: '0 16px',
      }}
    >
      {my ? (
        <>
          <div style={{ display: 'flex', alignItems: 'center', gap: 4 }}>
            <span style={{ fontSize: 13, fontWeight: 600, color: 'var(--text-2)' }}>پلن فعلی شما:</span>
            <span style={{ fontSize: 14, fontWeight: 700, color: 'var(--text)' }}>{planMetaOf(my.plan.name).label}</span>
          </div>
          {expiresAt ? (
            <div style={{ display: 'flex', alignItems: 'center', gap: 4, marginTop: 4 }}>
              <span style={{ fontSize: 12, fontWeight: 500, color: 'var(--text-3)' }}>زمان پایان اشتراک:</span>
              <span style={{ fontSize: 12, fontWeight: 600, color: 'var(--text-2)' }}>{formatDate(expiresAt)}</span>
              {daysLeft > 0 && (
                <span style={{ fontSize: 12, fontWeight: 500, color: 'var(--text-3)' }}>
                  ({formatNumber(daysLeft)} روز مانده)
                </span>
              )}
            </div>
          ) : (
            <div style={{ marginTop: 4 }}>
              <span style={{ fontSize: 12, fontWeight: 500, color: 'var(--text-3)' }}>بدون تاریخ انقضا</span>
            </div>
          )}
          {daysLeft < 3 && (
            <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginTop: 4 }}>
              <div style={{ display: 'flex', gap: 4, alignItems: 'center' }}>
                <InfoCircleRedFilled color="var(--danger)" />
                <span style={{ fontSize: 14, fontWeight: 500, color: 'var(--text)' }}>
                  {daysLeft <= 0 ? 'اشتراک شما به پایان رسیده است' : `${formatNumber(daysLeft)} روز تا پایان اشتراک`}
                </span>
              </div>
              <button
                onClick={onRenew}
                className="btn ghost sm"
                style={{ fontWeight: 600, color: 'var(--primary)', minWidth: 0, padding: '4px 12px' }}
              >
                تمدید اشتراک
              </button>
            </div>
          )}
        </>
      ) : (
        <>
          <div style={{ display: 'flex', alignItems: 'center', gap: 4 }}>
            <span style={{ fontSize: 13, fontWeight: 600, color: 'var(--text-2)' }}>پلن فعلی شما:</span>
            <span style={{ fontSize: 13, fontWeight: 700, color: 'var(--text)' }}>اشتراک ندارید</span>
          </div>
          <div style={{ display: 'flex', alignItems: 'center', marginTop: 4 }}>
            <span style={{ fontSize: 11, fontWeight: 500, color: 'var(--text-3)' }}>
              برای استفاده از امکانات یک پلن تهیه کنید
            </span>
          </div>
        </>
      )}
    </div>
  );
}

// ── PlanCard (522px, ported from tauri PlanCard.jsx) ─────────────────────────

function PlanCard({
  plan, currentPlanName, currentPlanLevel, currentPlanActive,
  usedTrial, onPurchase, onTrial, trialPending,
}: {
  plan: SubscriptionPlan;
  currentPlanName: string;
  currentPlanLevel: number;
  currentPlanActive: boolean;
  usedTrial: boolean;
  onPurchase: (period: SubscriptionPeriod) => void;
  onTrial: () => void;
  trialPending: boolean;
}) {
  const meta        = planMetaOf(plan.name);
  const isCurrent   = plan.name === currentPlanName;
  const isPopular   = plan.name === POPULAR_PLAN_NAME;
  const isFree      = plan.level <= 0;
  const isDowngrade = currentPlanActive && (plan.level ?? 0) < currentPlanLevel;

  const paidPeriods = useMemo(
    () => [...plan.periods].filter((p) => !p.is_trial).sort((a, b) => a.duration_months - b.duration_months),
    [plan.periods],
  );
  const trialPeriod = plan.periods.find((p) => p.is_trial);

  // Default to the longest (best-value) period, matching the source default.
  const [selectedUuid, setSelectedUuid] = useState<string>('');
  useEffect(() => {
    if (paidPeriods.length > 0 && !paidPeriods.some((p) => p.uuid === selectedUuid)) {
      setSelectedUuid(paidPeriods[paidPeriods.length - 1].uuid);
    }
  }, [paidPeriods, selectedUuid]);
  const selectedPeriod = paidPeriods.find((p) => p.uuid === selectedUuid) ?? paidPeriods[0];

  const isSelected = isPopular; // the source highlights the popular card with the indigo border

  return (
    <div
      data-testid={`plan-card-${plan.name}`}
      style={{
        width: '100%', minWidth: 0, height: 522, borderRadius: 10,
        border: isSelected ? '2px solid var(--primary-600)' : '2px solid var(--border)',
        background: 'var(--surface)', display: 'flex', flexDirection: 'column',
        padding: 16, position: 'relative', overflow: 'hidden',
      }}
    >
      {/* Gradient blur backdrop */}
      <div style={{
        position: 'absolute', top: -80, left: 0, width: 550, height: 160,
        background: PLAN_GRADIENT[plan.name] ?? PLAN_GRADIENT.free,
        opacity: 0.8, filter: 'blur(80px)', zIndex: 0, pointerEvents: 'none',
      }} />

      <div style={{ position: 'relative', zIndex: 1 }}>
        {/* Popular badge (top-right corner) */}
        {isPopular && (
          <div style={{
            position: 'absolute', width: 'fit-content', height: 32, top: -18, right: -20,
            background: 'var(--primary-700)', color: 'var(--on-primary)', padding: '0 16px', borderRadius: '0 10px 0 10px',
            fontSize: 13, fontWeight: 500, display: 'flex', alignItems: 'center', gap: 8, zIndex: 1,
          }}>
            محبوب‌ترین
            <SparkleIcon size={15} color="var(--warning)" />
          </div>
        )}

        <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
          <div style={{ fontSize: 20, fontWeight: 800, color: 'var(--text)', textAlign: 'left' }}>
            پلن {meta.label}
          </div>
          <div style={{ fontSize: 14, color: 'var(--text-2)', fontWeight: 500, textAlign: 'left', lineHeight: 1.6 }}>
            {meta.desc}
          </div>

          {/* Secretaries pill */}
          <div style={{ width: '100%', display: 'flex', justifyContent: 'flex-end' }}>
            <div dir="rtl" style={{
              minWidth: 86, height: 32, borderRadius: 29, background: 'var(--surface-3)',
              color: 'var(--text)', display: 'flex', gap: 6, alignItems: 'center', justifyContent: 'center',
              padding: '0 12px',
            }}>
              <span style={{ fontSize: 14, fontWeight: 500, whiteSpace: 'nowrap' }}>
                {formatNumber(plan.max_secretaries)} منشی
              </span>
              <PlanCardPerson size={18} />
            </div>
          </div>

          {/* Period toggle */}
          <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', width: '100%', minHeight: 48 }}>
            {paidPeriods.length > 0 && (
              <div role="tablist" aria-label="دوره اشتراک" style={{
                width: 263, maxWidth: '100%', height: 48, border: '1px solid var(--border)',
                borderRadius: 8, background: 'var(--surface)', display: 'flex', alignItems: 'center', overflow: 'hidden',
              }}>
                {paidPeriods.map((p, idx) => {
                  const on = p.uuid === selectedPeriod?.uuid;
                  return (
                    <React.Fragment key={p.uuid}>
                      <button
                        role="tab" aria-selected={on}
                        onClick={() => setSelectedUuid(p.uuid)}
                        style={{
                          flex: 1, height: '100%', display: 'flex', alignItems: 'center', justifyContent: 'center',
                          background: on ? 'var(--primary-soft)' : 'transparent', cursor: 'pointer',
                          border: 'none', fontFamily: 'inherit',
                          fontSize: 14, fontWeight: 500, color: on ? 'var(--primary)' : 'var(--text)',
                        }}
                      >
                        {p.label}
                      </button>
                      {idx < paidPeriods.length - 1 && (
                        <div style={{ width: 1, alignSelf: 'stretch', background: 'var(--border)' }} />
                      )}
                    </React.Fragment>
                  );
                })}
              </div>
            )}
          </div>

          {/* Price */}
          <div style={{ minHeight: 22 }}>
            {!isFree && selectedPeriod && (
              <div style={{
                marginBottom: 8, display: 'flex', alignItems: 'center', gap: 4,
                justifyContent: 'flex-end', width: '100%',
              }}>
                <span style={{ fontSize: 14, color: 'var(--text)', fontWeight: 600, direction: 'ltr' }}>
                  {formatRial(selectedPeriod.price_rials)}
                </span>
                <span style={{ fontSize: 14, color: 'var(--text)', fontWeight: 500 }}>: قیمت</span>
              </div>
            )}
          </div>
        </div>
      </div>

      <div style={{ borderTop: '1px solid var(--border)' }} />

      {/* Features */}
      <div style={{ flex: 1, minHeight: 0, display: 'flex', flexDirection: 'column' }}>
        {Object.entries(plan.features).map(([key, enabled]) => {
          const label = CARD_FEATURE_LABELS[key] ?? PLAN_FEATURE_LABELS[key] ?? key;
          return (
            <div key={key} style={{ display: 'flex', flexDirection: 'row', alignItems: 'center', justifyContent: 'flex-end', padding: '9.6px 0', gap: 8 }}>
              <span style={{ fontSize: 14, color: enabled ? 'var(--text)' : 'var(--text-3)', fontWeight: 500, textAlign: 'left' }}>
                {label}
              </span>
              <span style={{ position: 'relative', display: 'inline-flex', width: 22, height: 22 }}>
                {enabled
                  ? <CheckCircleIcon style={{ width: 22, height: 22, color: 'var(--success)' }} />
                  : <CloseCircleFilled size={22} color="var(--border-2)" />}
              </span>
            </div>
          );
        })}
      </div>

      {/* Trial box (dashed) */}
      {!isFree && trialPeriod && !usedTrial && !isDowngrade && (
        <div style={{ position: 'relative', width: 268, maxWidth: '100%', height: 59, margin: '0 auto 16px' }}>
          <div style={{
            position: 'relative', zIndex: 1, display: 'flex', alignItems: 'center', justifyContent: 'space-between',
            height: '100%', padding: '0 16px',
          }}>
            <button
              onClick={onTrial} disabled={trialPending}
              style={{ background: 'none', border: 'none', cursor: 'pointer', fontFamily: 'inherit', fontSize: 16, fontWeight: 500, color: 'var(--primary)' }}
            >
              {trialPending ? 'در حال فعال‌سازی...' : 'فعال سازی'}
            </button>
            <div style={{ display: 'flex', alignItems: 'center', gap: 4 }}>
              <span style={{ fontSize: 14, fontWeight: 500, color: 'var(--text-2)' }}>
                تریال {formatNumber(trialPeriod.duration_months)} ماهه رایگان
              </span>
              <GiftIcon />
            </div>
          </div>
          <svg style={{ position: 'absolute', inset: 0, width: '100%', height: '100%', pointerEvents: 'none' }} viewBox="0 0 268 59" preserveAspectRatio="none">
            <rect x="0.5" y="0.5" width="267" height="58" rx="6" fill="transparent" strokeWidth="1" strokeDasharray="6 4"  style={{ stroke: 'var(--primary)' }}/>
          </svg>
        </div>
      )}

      <div style={{ borderTop: '1px solid var(--border)', margin: '0 8px 16px' }} />

      {/* Buy button */}
      {isFree ? (
        <button className="btn" style={{ marginTop: 'auto', width: '100%', height: 48, cursor: 'default' }} disabled>
          {isCurrent ? 'پلن فعلی شما' : 'رایگان'}
        </button>
      ) : isDowngrade ? (
        <button className="btn" style={{ marginTop: 'auto', width: '100%', height: 48, opacity: 0.6, cursor: 'not-allowed' }} disabled>
          تا پایان اشتراک فعلی قابل انتخاب نیست
        </button>
      ) : (
        <button
          onClick={() => selectedPeriod && onPurchase(selectedPeriod)}
          disabled={!selectedPeriod}
          style={{
            marginTop: 'auto', width: '100%', height: 48, borderRadius: 4, border: 'none',
            background: 'var(--primary)', color: 'var(--on-primary)', fontWeight: 700, fontSize: 16,
            fontFamily: 'inherit', cursor: selectedPeriod ? 'pointer' : 'not-allowed',
          }}
        >
          {isCurrent ? 'تمدید اشتراک' : 'خرید اشتراک'}
        </button>
      )}
    </div>
  );
}
