import { StatusBar } from 'expo-status-bar';
import React, { useState, useEffect } from 'react';
import { View, ActivityIndicator, StyleSheet, SafeAreaView, FlatList } from 'react-native';
import API from './../API.js';
import Post from './../components/Post.js';
import NewPost from "./../components/NewPost.js";

import AsyncStorage from '@react-native-async-storage/async-storage';

const storeFeed = async (value) => {
    try {
        const jsonValue = JSON.stringify(value)
        await AsyncStorage.setItem('feed', jsonValue)
    } catch (e) {
    }
}

const getFeed = async () => {
    try {
        const value = await AsyncStorage.getItem('feed')
        if (value !== null) {
            return JSON.parse(value);
        }
    } catch (e) {
        return []
    }
}

let Feed = ({ navigation, route }) => {
    let [Me, setMeProfile] = useState({});
    let [Posts, setPosts] = useState([]);
    useEffect(async () => {
        let loggedIn = await API.isLoggedIn();
        if(!loggedIn) return navigation.navigate('Login');
        let cacheFeed = await getFeed() || [];
        setPosts(cacheFeed);
        let r = await API.getMe();
        setMeProfile(r);
        if (route.params && route.params.profileid) {
            navigation.navigate('Profile', { profileid: route.params.profileid })
        } else {
            let posts = await API.getPosts();
            setPosts(posts);
            storeFeed(posts);
        }
    }, [route.params]);
    const renderPost = (({ item }) => {
        if (item.nonOrganicType === 'PopularUsers' || item.nonOrganicType === 'PopularGroups')
            return (<></>);
        return (<Post post={item} viewer={Me} />);
    });


    return (

        <SafeAreaView style={styles.container}>
            <View>
                <FlatList
                    data={Posts}
                    renderItem={renderPost}
                    keyExtractor={item => item._id || item.createdAt}
                    ListHeaderComponent={<NewPost newPostCB={(newPost) => setPosts([newPost, ...Posts])} />}
                    refreshing={Posts.length === 0}
                    onRefresh={() => {
                        API.getPosts().then(setPosts);
                    }}
                />
            </View>
            <StatusBar style="auto" />
        </SafeAreaView>
    );
}

export default Feed;

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: "#edf2f7",
    },
});