import React, { useState } from 'react';
import {
  View,
  Text,
  StyleSheet,
  TouchableOpacity,
  ActivityIndicator,
} from 'react-native';
import { Ionicons } from '@expo/vector-icons';
import { usePaymentSheet } from '@stripe/stripe-react-native';
import { useToast } from '@/components/ui/Toast';
import { AppColors, BorderRadius, FontSizes, FontWeights, Spacing, Shadows } from '@/constants/theme';
import type { Beneficiary } from '@/types';

const STRIPE_API_URL = 'https://wellnuo.smartlaunchhub.com/api/stripe';
const SUBSCRIPTION_PRICE = 49; // $49/month

interface SubscriptionPaymentProps {
  beneficiary: Beneficiary;
  onSuccess?: () => void;
  compact?: boolean; // For inline use vs full page
}

export function SubscriptionPayment({ beneficiary, onSuccess, compact = false }: SubscriptionPaymentProps) {
  const [isProcessing, setIsProcessing] = useState(false);
  const { initPaymentSheet, presentPaymentSheet } = usePaymentSheet();
  const toast = useToast();

  const isExpired = beneficiary?.subscription?.status === 'expired';

  const handleSubscribe = async () => {
    setIsProcessing(true);

    try {
      // 1. Create subscription payment sheet via new Stripe Subscriptions API
      const response = await fetch(`${STRIPE_API_URL}/create-subscription-payment-sheet`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify({
          beneficiaryId: beneficiary.id,
        }),
      });

      const data = await response.json();

      // Check if already subscribed
      if (data.alreadySubscribed) {
        toast.success(
          'Already Subscribed!',
          `${beneficiary.displayName} already has an active subscription.`
        );

        onSuccess?.();
        return;
      }

      if (!data.clientSecret) {
        throw new Error(data.error || 'Failed to create subscription');
      }

      // 2. Initialize the Payment Sheet
      const { error: initError } = await initPaymentSheet({
        merchantDisplayName: 'WellNuo',
        paymentIntentClientSecret: data.clientSecret,
        customerId: data.customer,
        customerEphemeralKeySecret: data.ephemeralKey,
        returnURL: 'wellnuo://stripe-redirect',
        applePay: {
          merchantCountryCode: 'US',
        },
        googlePay: {
          merchantCountryCode: 'US',
          testEnv: true,
        },
      });

      if (initError) {
        throw new Error(initError.message);
      }

      // 3. Present the Payment Sheet
      const { error: presentError } = await presentPaymentSheet();

      if (presentError) {
        if (presentError.code === 'Canceled') {
          // User canceled - don't show error, just return
          setIsProcessing(false);
          return;
        }
        throw new Error(presentError.message);
      }

      // 4. Payment sheet closed - verify the subscription is actually active
      // This is CRITICAL: presentPaymentSheet can return success even without payment!
      const statusResponse = await fetch(
        `${STRIPE_API_URL}/subscription-status/${beneficiary.id}`
      );
      const statusData = await statusResponse.json();

      // Check if subscription is actually active
      if (!['active', 'trialing'].includes(statusData.status)) {
        // Payment was not completed - subscription is still incomplete
        throw new Error(
          statusData.status === 'incomplete'
            ? 'Payment was not completed. Please try again and enter your card details.'
            : `Subscription activation failed. Status: ${statusData.status}`
        );
      }

      // Update local state with data from Stripe
      toast.success(
        'Subscription Activated!',
        `Subscription for ${beneficiary.displayName} is now active.`
      );

      onSuccess?.();
    } catch (error) {
      toast.error(
        'Payment Failed',
        error instanceof Error ? error.message : 'Something went wrong. Please try again.'
      );
    } finally {
      setIsProcessing(false);
    }
  };

  const features = [
    '24/7 AI wellness monitoring',
    'Unlimited Julia AI chat',
    'Detailed activity reports',
    'Smart alerts & notifications',
  ];

  if (compact) {
    // Compact version for inline use
    return (
      <View style={styles.compactContainer}>
        <View style={styles.compactHeader}>
          <View style={styles.compactIconContainer}>
            <Ionicons
              name={isExpired ? 'time-outline' : 'diamond-outline'}
              size={32}
              color={isExpired ? AppColors.error : AppColors.accent}
            />
          </View>
          <View style={styles.compactInfo}>
            <Text style={styles.compactTitle}>
              {isExpired ? 'Subscription Expired' : 'Subscription Required'}
            </Text>
            <Text style={styles.compactPrice}>
              ${SUBSCRIPTION_PRICE}/month
            </Text>
          </View>
        </View>

        <TouchableOpacity
          style={[styles.subscribeButton, isProcessing && styles.buttonDisabled]}
          onPress={handleSubscribe}
          disabled={isProcessing}
        >
          {isProcessing ? (
            <ActivityIndicator color={AppColors.white} />
          ) : (
            <>
              <Ionicons name="card" size={20} color={AppColors.white} />
              <Text style={styles.subscribeButtonText}>
                {isExpired ? 'Renew Now' : 'Subscribe Now'}
              </Text>
            </>
          )}
        </TouchableOpacity>
      </View>
    );
  }

  // Full version
  return (
    <View style={styles.container}>
      {/* Icon */}
      <View style={[styles.iconContainer, isExpired && { backgroundColor: AppColors.errorLight }]}>
        <Ionicons
          name={isExpired ? 'time-outline' : 'diamond-outline'}
          size={56}
          color={isExpired ? AppColors.error : AppColors.accent}
        />
      </View>

      {/* Title */}
      <Text style={styles.title}>
        {isExpired ? 'Subscription Expired' : 'Subscription Required'}
      </Text>

      <Text style={styles.subtitle}>
        {isExpired
          ? `Your subscription for ${beneficiary.displayName} has expired. Renew now to continue monitoring their wellness.`
          : `Activate a subscription to view ${beneficiary.displayName}'s dashboard and wellness data.`}
      </Text>

      {/* Price Card */}
      <View style={styles.priceCard}>
        <View style={styles.priceHeader}>
          <View>
            <Text style={styles.planName}>WellNuo Pro</Text>
            <Text style={styles.planDesc}>Full access to all features</Text>
          </View>
          <View style={styles.priceBadge}>
            <Text style={styles.priceAmount}>${SUBSCRIPTION_PRICE}</Text>
            <Text style={styles.priceUnit}>/month</Text>
          </View>
        </View>

        <View style={styles.features}>
          {features.map((feature, index) => (
            <View key={index} style={styles.featureRow}>
              <Ionicons name="checkmark-circle" size={18} color={AppColors.success} />
              <Text style={styles.featureText}>{feature}</Text>
            </View>
          ))}
        </View>
      </View>

      {/* Subscribe Button */}
      <TouchableOpacity
        style={[styles.subscribeButtonFull, isProcessing && styles.buttonDisabled]}
        onPress={handleSubscribe}
        disabled={isProcessing}
      >
        {isProcessing ? (
          <ActivityIndicator color={AppColors.white} />
        ) : (
          <>
            <Ionicons name="card" size={22} color={AppColors.white} />
            <Text style={styles.subscribeButtonTextFull}>
              {isExpired ? 'Renew Subscription' : 'Subscribe Now'}
            </Text>
          </>
        )}
      </TouchableOpacity>

      {/* Security Badge */}
      <View style={styles.securityBadge}>
        <Ionicons name="lock-closed" size={14} color={AppColors.success} />
        <Text style={styles.securityText}>Secure payment powered by Stripe</Text>
      </View>
    </View>
  );
}

const styles = StyleSheet.create({
  // Full version styles
  container: {
    flex: 1,
    padding: Spacing.xl,
    alignItems: 'center',
    justifyContent: 'center',
  },
  iconContainer: {
    width: 100,
    height: 100,
    borderRadius: 50,
    backgroundColor: AppColors.accentLight,
    justifyContent: 'center',
    alignItems: 'center',
    marginBottom: Spacing.lg,
  },
  title: {
    fontSize: FontSizes['2xl'],
    fontWeight: FontWeights.bold,
    color: AppColors.textPrimary,
    textAlign: 'center',
    marginBottom: Spacing.sm,
  },
  subtitle: {
    fontSize: FontSizes.base,
    color: AppColors.textSecondary,
    textAlign: 'center',
    lineHeight: 24,
    marginBottom: Spacing.xl,
    paddingHorizontal: Spacing.md,
  },
  priceCard: {
    width: '100%',
    backgroundColor: AppColors.surface,
    borderRadius: BorderRadius.xl,
    padding: Spacing.lg,
    marginBottom: Spacing.xl,
    ...Shadows.sm,
  },
  priceHeader: {
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
    marginBottom: Spacing.md,
  },
  planName: {
    fontSize: FontSizes.lg,
    fontWeight: FontWeights.semibold,
    color: AppColors.textPrimary,
  },
  planDesc: {
    fontSize: FontSizes.sm,
    color: AppColors.textSecondary,
    marginTop: 2,
  },
  priceBadge: {
    flexDirection: 'row',
    alignItems: 'baseline',
  },
  priceAmount: {
    fontSize: FontSizes['2xl'],
    fontWeight: FontWeights.bold,
    color: AppColors.primary,
  },
  priceUnit: {
    fontSize: FontSizes.sm,
    color: AppColors.textMuted,
    marginLeft: 2,
  },
  features: {
    gap: Spacing.sm,
  },
  featureRow: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: Spacing.sm,
  },
  featureText: {
    fontSize: FontSizes.sm,
    color: AppColors.textSecondary,
  },
  subscribeButtonFull: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    gap: Spacing.sm,
    width: '100%',
    backgroundColor: AppColors.primary,
    paddingVertical: Spacing.lg,
    borderRadius: BorderRadius.lg,
    ...Shadows.primary,
  },
  subscribeButtonTextFull: {
    fontSize: FontSizes.lg,
    fontWeight: FontWeights.semibold,
    color: AppColors.white,
  },
  securityBadge: {
    flexDirection: 'row',
    alignItems: 'center',
    gap: Spacing.xs,
    marginTop: Spacing.lg,
  },
  securityText: {
    fontSize: FontSizes.xs,
    color: AppColors.success,
  },
  // Compact version styles
  compactContainer: {
    backgroundColor: AppColors.surface,
    borderRadius: BorderRadius.xl,
    padding: Spacing.lg,
    ...Shadows.sm,
  },
  compactHeader: {
    flexDirection: 'row',
    alignItems: 'center',
    marginBottom: Spacing.md,
  },
  compactIconContainer: {
    width: 56,
    height: 56,
    borderRadius: 28,
    backgroundColor: AppColors.accentLight,
    justifyContent: 'center',
    alignItems: 'center',
    marginRight: Spacing.md,
  },
  compactInfo: {
    flex: 1,
  },
  compactTitle: {
    fontSize: FontSizes.base,
    fontWeight: FontWeights.semibold,
    color: AppColors.textPrimary,
  },
  compactPrice: {
    fontSize: FontSizes.lg,
    fontWeight: FontWeights.bold,
    color: AppColors.primary,
    marginTop: 2,
  },
  subscribeButton: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'center',
    gap: Spacing.sm,
    backgroundColor: AppColors.primary,
    paddingVertical: Spacing.md,
    borderRadius: BorderRadius.lg,
  },
  subscribeButtonText: {
    fontSize: FontSizes.base,
    fontWeight: FontWeights.semibold,
    color: AppColors.white,
  },
  buttonDisabled: {
    opacity: 0.7,
  },
});