import React, { useState, useEffect } from 'react';
import { Text, ScrollView, FlatList, StyleSheet } from 'react-native';
import { Avatar, Button, Card, Title, Paragraph } from 'react-native-paper';
import API from './../API.js';
import UserName from './UserName.js';
import Media from './Media.js';
import Comment from "./Comment";
import NewComment from './NewComment.js';


let Post = (props) => {
    const viewer = props.viewer;
    let [showCommentsB, changeshowCommentsB] = useState(false);
    let [post, changePost] = useState(props.post);
    let [likes, changeLikes] = useState(Object.keys(post.reactions).length)
    let toProfileText = post.toProfile && post.toProfile !== post.profileid ?
        <Text> {">"} <UserName profileid={post.toProfile} /></Text> : undefined;
    let cleanContent = post.content.replace(/@[A-z]+:.+\w/g, '');
    const newComentAdded = (commentData) => {
        let newPostObj = { ...post };
        newPostObj.comments.push(commentData);
        changePost(newPostObj);
    };
    const newPostReaction = () => {
        let newPostObj = { ...post };
        if (!newPostObj.reactions[viewer._id]) {
            API.newPostReaction(post._id).then(() => {
                newPostObj.reactions[viewer._id] = { type: "like" };
                changeLikes(likes+1);
            });
        } else {
            API.removePostReaction(viewer._id).then(() => {
                delete newPostObj.reactions[viewer._id];
                changeLikes(likes-1);
            });
        }
        changePost(newPostObj);
    }
    const renderComment = ({ item }) => (
        <Comment comment={item} />
    );
    return (
        <Card style={styles.card}>
            <Card.Content>
                <Text style={styles.userName}>
                    <UserName profileid={post.profileid} />
                    {toProfileText}
                </Text>
                <Text style={{ fontSize: 18 }}>{cleanContent}</Text>
                <Media content={post.content} />

            </Card.Content>
            <Card.Actions style={{ flexDirection: "row", flow: 4, justifyContent: 'space-evenly', fontSize: 18 }}>
                <Button
                    icon={post.reactions[viewer._id] ? "favorite" : "favorite-border"}
                    labelStyle={{ fontSize: 18 }}
                    style={{ flow: 1 }}
                    onPress={newPostReaction}
                >
                    {likes}
                </Button>
                <Button icon="forum" labelStyle={{ fontSize: 18 }} style={{ flow: 1 }} onPress={() => { changeshowCommentsB(!showCommentsB) }} >{post.comments.length}</Button>
                <Button icon="ios-share" style={{ flow: 1 }} labelStyle={{ fontSize: 18 }}></Button>
                <Button icon={!post.bookmarks || !post.bookmarks.includes(viewer._id) ? "bookmark-outline" : "bookmark"} style={{ flow: 1 }} labelStyle={{ fontSize: 18 }}></Button>
            </Card.Actions>
            {showCommentsB && <NewComment postid={post._id} newComentAdded={newComentAdded} />}
            {
                showCommentsB &&
                <ScrollView style={{ maxHeight: 300 }}>
                    <FlatList
                        data={post.comments}
                        renderItem={renderComment}
                        keyExtractor={item => item.createdAt}
                    /></ScrollView>
            }
        </Card>
    );
}

export default React.memo(Post);

const styles = StyleSheet.create({
    userName: {
        fontSize: 14,
        fontWeight: 'bold',
        marginBottom: 5,
        fontSize: 18,
    },
    card: {
        margin: 8,
        backgroundColor: "#FFFFFF"
    },
    comment: {
        margin: 8,
        marginTop: 0,
        padding: 8
    }
});