import React, { useState, useEffect } from 'react';
import { View, Text, TextInput, Button, FlatList, TouchableOpacity, StyleSheet } from 'react-native';
import AsyncStorage from '@react-native-async-storage/async-storage';

interface Product {
  id: string;
  name: string;
  price: number;
}

export default function App() {
  const [products, setProducts] = useState<Product[]>([]);
  const [name, setName] = useState('');
  const [price, setPrice] = useState('');
  const [editId, setEditId] = useState<string | null>(null);

  useEffect(() => {
    loadProducts();
  }, []);

  const loadProducts = async () => {
    const data = await AsyncStorage.getItem('products');
    if (data) setProducts(JSON.parse(data));
  };

  const saveProducts = async (newProducts: Product[]) => {
    await AsyncStorage.setItem('products', JSON.stringify(newProducts));
    setProducts(newProducts);
  };

  const addProduct = () => {
    const newProduct = { id: Date.now().toString(), name, price: parseFloat(price) };
    saveProducts([...products, newProduct]);
    setName('');
    setPrice('');
  };

  const updateProduct = () => {
    const updated = products.map(p => p.id === editId ? { ...p, name, price: parseFloat(price) } : p);
    saveProducts(updated);
    setEditId(null);
    setName('');
    setPrice('');
  };

  const deleteProduct = (id: string) => {
    saveProducts(products.filter(p => p.id !== id));
  };

  const sortByPrice = () => {
    saveProducts([...products].sort((a, b) => a.price - b.price));
  };

  return (
    <View style={styles.container}>
      <TextInput style={styles.input} placeholder="Név" value={name} onChangeText={setName} />
      <TextInput style={styles.input} placeholder="Ár" value={price} onChangeText={setPrice} keyboardType="numeric" />
      <Button title={editId ? 'Frissítés' : 'Hozzáadás'} onPress={editId ? updateProduct : addProduct} color="#ff00ff" />
      <Button title="Rendezés ár szerint" onPress={sortByPrice} color="#ff00ff" />
      <FlatList
        data={products}
        keyExtractor={item => item.id}
        renderItem={({ item }) => (
          <View style={styles.item}>
            <Text style={{ color: '#ffffff' }}>{item.name} - {item.price} Ft</Text>
            <View style={styles.buttons}>
              <TouchableOpacity onPress={() => { setEditId(item.id); setName(item.name); setPrice(item.price.toString()); }}>
                <Text style={styles.edit}>✏️</Text>
              </TouchableOpacity>
              <TouchableOpacity onPress={() => deleteProduct(item.id)}>
                <Text style={styles.delete}>🗑️</Text>
              </TouchableOpacity>
            </View>
          </View>
        )}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  container: { flex: 1, padding: 16, backgroundColor: '#000000' },
  input: { borderWidth: 1, borderColor: '#333333', padding: 8, marginBottom: 8, borderRadius: 4, backgroundColor: '#1a1a1a', color: '#ffffff' },
  item: { padding: 16, borderBottomWidth: 1, borderBottomColor: '#333333', flexDirection: 'row', justifyContent: 'space-between' },
  buttons: { flexDirection: 'row', gap: 8 },
  edit: { fontSize: 18 },
  delete: { fontSize: 18 },
});
