/**
 * Example: How to integrate credit system into deck creation
 *
 * This is a reference implementation showing how to:
 * 1. Handle credit errors when creating a deck
 * 2. Show insufficient credits modal
 * 3. Display user's credit balance
 *
 * Copy this pattern to your actual deck creation screens.
 */

import React, { useState, useEffect } from 'react';
import { View, Text, TextInput, TouchableOpacity, Alert, StyleSheet } from 'react-native';
import { post } from '../utils/apiClient';
import { InsufficientCreditsModal } from '../components/InsufficientCreditsModal';
import { useInsufficientCredits } from '../hooks/useInsufficientCredits';
import { creditService } from '../services/creditService';

const BASE_API_URL = process.env.EXPO_PUBLIC_API_URL || 'https://manadeck-backend-111768794939.europe-west3.run.app';

export function DeckCreationExample() {
  const [deckName, setDeckName] = useState('');
  const [deckDescription, setDeckDescription] = useState('');
  const [loading, setLoading] = useState(false);
  const [creditBalance, setCreditBalance] = useState<number>(0);

  // Hook to manage insufficient credits modal
  const insufficientCredits = useInsufficientCredits();

  // Load credit balance on mount
  useEffect(() => {
    loadCreditBalance();
  }, []);

  const loadCreditBalance = async () => {
    try {
      const balance = await creditService.getBalance();
      setCreditBalance(balance);
    } catch (error) {
      console.error('Failed to load credit balance:', error);
    }
  };

  const handleCreateDeck = async () => {
    if (!deckName.trim()) {
      Alert.alert('Error', 'Please enter a deck name');
      return;
    }

    setLoading(true);

    try {
      const response = await post(`${BASE_API_URL}/v1/api/decks`, {
        name: deckName,
        description: deckDescription,
      });

      // Success!
      Alert.alert(
        'Success',
        `Deck created successfully! ${response.creditsUsed} mana used.`,
        [
          {
            text: 'OK',
            onPress: () => {
              // Refresh credit balance
              loadCreditBalance();
              // Reset form
              setDeckName('');
              setDeckDescription('');
            },
          },
        ]
      );
    } catch (error: any) {
      // Check if this is a credit error
      const isCreditError = insufficientCredits.handleCreditError(error);

      if (!isCreditError) {
        // Handle other errors
        console.error('Deck creation error:', error);
        Alert.alert(
          'Error',
          error.message || 'Failed to create deck. Please try again.'
        );
      }
    } finally {
      setLoading(false);
    }
  };

  const handlePurchaseCredits = () => {
    // Close modal
    insufficientCredits.hideInsufficientCredits();

    // Navigate to purchase screen or open purchase flow
    Alert.alert('Purchase Credits', 'This would navigate to the credit purchase screen');
    // In real implementation:
    // navigation.navigate('PurchaseCredits');
  };

  return (
    <View style={styles.container}>
      {/* Credit Balance Display */}
      <View style={styles.creditBanner}>
        <Text style={styles.creditLabel}>Your Mana:</Text>
        <Text style={styles.creditValue}>{creditBalance} ⚡</Text>
      </View>

      {/* Form */}
      <View style={styles.form}>
        <Text style={styles.label}>Deck Name</Text>
        <TextInput
          style={styles.input}
          value={deckName}
          onChangeText={setDeckName}
          placeholder="Enter deck name"
          editable={!loading}
        />

        <Text style={styles.label}>Description (Optional)</Text>
        <TextInput
          style={[styles.input, styles.textArea]}
          value={deckDescription}
          onChangeText={setDeckDescription}
          placeholder="Enter deck description"
          multiline
          numberOfLines={4}
          editable={!loading}
        />

        {/* Cost Info */}
        <View style={styles.costInfo}>
          <Text style={styles.costLabel}>Cost:</Text>
          <Text style={styles.costValue}>10 mana ⚡</Text>
        </View>

        {/* Create Button */}
        <TouchableOpacity
          style={[styles.button, loading && styles.buttonDisabled]}
          onPress={handleCreateDeck}
          disabled={loading}
        >
          <Text style={styles.buttonText}>
            {loading ? 'Creating...' : 'Create Deck'}
          </Text>
        </TouchableOpacity>
      </View>

      {/* Insufficient Credits Modal */}
      <InsufficientCreditsModal
        visible={insufficientCredits.visible}
        requiredCredits={insufficientCredits.requiredCredits}
        availableCredits={insufficientCredits.availableCredits}
        operation={insufficientCredits.operation}
        onClose={insufficientCredits.hideInsufficientCredits}
        onPurchase={handlePurchaseCredits}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    padding: 16,
    backgroundColor: '#f5f5f5',
  },
  creditBanner: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    backgroundColor: '#3b82f6',
    padding: 16,
    borderRadius: 12,
    marginBottom: 20,
  },
  creditLabel: {
    fontSize: 16,
    color: 'white',
    fontWeight: '500',
  },
  creditValue: {
    fontSize: 20,
    color: 'white',
    fontWeight: '700',
  },
  form: {
    backgroundColor: 'white',
    borderRadius: 12,
    padding: 16,
  },
  label: {
    fontSize: 14,
    fontWeight: '600',
    color: '#374151',
    marginBottom: 8,
    marginTop: 12,
  },
  input: {
    borderWidth: 1,
    borderColor: '#d1d5db',
    borderRadius: 8,
    padding: 12,
    fontSize: 16,
    backgroundColor: 'white',
  },
  textArea: {
    height: 100,
    textAlignVertical: 'top',
  },
  costInfo: {
    flexDirection: 'row',
    alignItems: 'center',
    justifyContent: 'space-between',
    backgroundColor: '#f3f4f6',
    padding: 12,
    borderRadius: 8,
    marginTop: 16,
  },
  costLabel: {
    fontSize: 14,
    color: '#6b7280',
    fontWeight: '500',
  },
  costValue: {
    fontSize: 16,
    color: '#1f2937',
    fontWeight: '700',
  },
  button: {
    backgroundColor: '#3b82f6',
    padding: 16,
    borderRadius: 8,
    alignItems: 'center',
    marginTop: 20,
  },
  buttonDisabled: {
    backgroundColor: '#9ca3af',
  },
  buttonText: {
    color: 'white',
    fontSize: 16,
    fontWeight: '600',
  },
});