import React, { useState, useEffect } from 'react';
import { StyleSheet, Text, View, FlatList, ActivityIndicator } from 'react-native';


const dataURL = "https://gist.githubusercontent.com/andteki/91c74e1ae7f292ec02f100e09fe52c7f/raw/487f4dd6e0e9da0bab6e8920b1c3b9f2c6b70e8f/test.json"
                 
export default function App() {
  const [isLoading, setLoading] = useState(true);
  const [data, setData] = useState([]);
  const [title, setTitle] = useState([]);
  const [desc, setDesc] = useState([]);

  useEffect(() => {
    fetch(dataURL)
    .then((response) => response.json())
    .then((data) => {
      setData(data.friends);
      setTitle(data.title);
      setDesc(data.desc);
    })
    .catch((error) => alert(error))
    .finally(()=>setLoading(false));
  }, []);

  return (
    <View style={styles.container}>
      {isLoading ? (
        <ActivityIndicator />
      ) : (
        <View>          
          <Text style={styles.title}>{title}</Text>
          <FlatList
            data = {data}
            keyExtractor={({ id }, index) => id}
            renderItem={({item}) => (
              <Text style={styles.friend} >
                {item.name} - {item.age}
              </Text>
            )}
          />
          <Text style={styles.desc}>{desc}</Text>
        </View>
        
      )}
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
    marginTop: 25,
  },
  friend: {
    fontSize: 22,    
  },
  title: {
    fontSize: 30,
    fontWeight: "bold",
  },
  desc: {
    textAlign: "center",
    marginBottom: 100,
    color: "#333",
  }
});