import React, { useEffect, useState } from 'react';
import { Link } from 'react-router-dom';
import { CreditCard, CheckCircle, Clock } from 'lucide-react';
import { api } from '../services/api';
import { Subscription } from '../types';
import { useI18n } from '../contexts/I18nContext';
import { usePageTitle } from '../hooks/usePageTitle';
import { useToast } from '../contexts/ToastContext';
import Button from '../components/common/Button';
import Card, { CardContent, CardHeader } from '../components/common/Card';

interface SubscriptionStatus {
  has_active_subscription: boolean;
  subscription: Subscription | null;
}

const SubscriptionPage: React.FC = () => {
  const { t } = useI18n();
  usePageTitle('Subscription');
  const { showToast } = useToast();
  const [status, setStatus] = useState<SubscriptionStatus | null>(null);
  const [loading, setLoading] = useState(true);
  const [initiating, setInitiating] = useState<string | null>(null);

  useEffect(() => {
    api.subscriptions.me()
      .then((data: any) => setStatus(data))
      .catch(() => {})
      .finally(() => setLoading(false));
  }, []);

  const handleSubscribe = async (plan: 'monthly' | 'yearly') => {
    setInitiating(plan);
    try {
      const result = await api.payments.initiate({ type: 'subscription', plan }) as any;
      window.location.href = result.payment_url;
    } catch (err: any) {
      showToast(err.message || 'Failed to initiate payment', 'error');
      setInitiating(null);
    }
  };

  const formatter = new Intl.NumberFormat('fr-TG', {
    style: 'currency',
    currency: 'XOF',
    minimumFractionDigits: 0,
  });

  return (
    <div className="max-w-3xl mx-auto px-4 sm:px-6 lg:px-8 py-10">
      <div className="flex items-center gap-3 mb-8">
        <CreditCard className="h-7 w-7 text-accent-600" />
        <h1 className="text-3xl font-bold text-primary-800">{t.subscription.title}</h1>
      </div>

      {/* Current status */}
      {loading ? (
        <div className="mb-8 p-4 bg-gray-50 border border-gray-200 rounded-lg animate-pulse h-16" />
      ) : status?.has_active_subscription && status.subscription ? (
        <div className="mb-8 p-4 bg-success-50 border border-success-200 rounded-lg flex items-start gap-3">
          <CheckCircle className="h-5 w-5 text-success-600 mt-0.5 flex-shrink-0" />
          <div>
            <p className="font-medium text-success-800">
              {t.subscription.activePlan}:{' '}
              {status.subscription.plan === 'monthly' ? t.subscription.monthly : t.subscription.yearly}
            </p>
            <p className="text-sm text-success-700 mt-0.5">
              {t.subscription.activeUntil}{' '}
              {new Date(status.subscription.ends_at).toLocaleDateString('fr-TG')}
            </p>
          </div>
        </div>
      ) : (
        <div className="mb-8 p-4 bg-warning-50 border border-warning-200 rounded-lg flex items-start gap-3">
          <Clock className="h-5 w-5 text-warning-600 mt-0.5 flex-shrink-0" />
          <div>
            <p className="font-medium text-warning-800">{t.subscription.noSubscription}</p>
            <p className="text-sm text-warning-700 mt-0.5">{t.subscription.noSubscriptionDesc}</p>
          </div>
        </div>
      )}

      {/* Plan cards */}
      <h2 className="text-xl font-semibold text-primary-800 mb-4">{t.subscription.choosePlan}</h2>
      <div className="grid grid-cols-1 sm:grid-cols-2 gap-6">
        {/* Monthly */}
        <Card className="border-2 border-gray-200 hover:border-accent-400 transition-colors">
          <CardHeader>
            <h3 className="text-lg font-bold text-primary-800">{t.subscription.monthly}</h3>
          </CardHeader>
          <CardContent>
            <p className="text-3xl font-bold text-accent-700 mb-1">
              {formatter.format(1000)}
            </p>
            <p className="text-sm text-primary-500 mb-4">{t.subscription.perMonth}</p>
            <p className="text-sm text-primary-600 mb-6">{t.subscription.monthlyDesc}</p>
            <Button
              variant="secondary"
              className="w-full"
              disabled={initiating !== null}
              onClick={() => handleSubscribe('monthly')}
            >
              {initiating === 'monthly' ? t.payment.processing : t.subscription.subscribe}
            </Button>
          </CardContent>
        </Card>

        {/* Yearly */}
        <Card className="border-2 border-accent-400 relative">
          <div className="absolute -top-3 left-1/2 -translate-x-1/2">
            <span className="bg-accent-500 text-white text-xs font-bold px-3 py-1 rounded-full">
              {t.subscription.saveMonths}
            </span>
          </div>
          <CardHeader>
            <h3 className="text-lg font-bold text-primary-800">{t.subscription.yearly}</h3>
          </CardHeader>
          <CardContent>
            <p className="text-3xl font-bold text-accent-700 mb-1">
              {formatter.format(10000)}
            </p>
            <p className="text-sm text-primary-500 mb-4">{t.subscription.perYear}</p>
            <p className="text-sm text-primary-600 mb-6">{t.subscription.yearlyDesc}</p>
            <Button
              variant="secondary"
              className="w-full"
              disabled={initiating !== null}
              onClick={() => handleSubscribe('yearly')}
            >
              {initiating === 'yearly' ? t.payment.processing : t.subscription.subscribe}
            </Button>
          </CardContent>
        </Card>
      </div>

      <p className="mt-6 text-center text-sm text-primary-500">
        <Link to="/agency/dashboard" className="text-accent-600 hover:underline">
          ← Back to Dashboard
        </Link>
      </p>
    </div>
  );
};

export default SubscriptionPage;