import React, { useMemo, useRef, useState } from 'react';
import { Text, Pressable, FlatList, StyleSheet, View, Share, Alert, Linking, Animated, PanResponder } from 'react-native';
import { Button, Card, Chip } 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';
import Moment from 'moment';
import { useSnapshot } from 'valtio';
import GlobalState from '../contexts/GlobalState.js';
import i18n from "../i18nMessages.js";
import ProfilePhotoCircle from './ProfilePhotoCircle.js';
import { posthog } from './../PostHog.js';
import { useNavigation } from '@react-navigation/native';
import ParsedText from 'react-native-parsed-text';


let Post = (props) => {
    const gState = useSnapshot(GlobalState);
    const viewer = gState.me;
    let [showCommentsB, changeshowCommentsB] = useState(props.showComments || false);
    let [post, changePost] = useState(props.post);
    const [deleted, setDeleted] = useState(false);
    let [likes, changeLikes] = useState(Object.keys(post.reactions).length);
    let [bookmarked, changeBookmarked] = useState(post.bookmarks && post.bookmarks.includes(viewer._id));
    const isOwner = String(post.profileid || '') === String(viewer?._id || '');
    const swipeX = useRef(new Animated.Value(0)).current;
    const SWIPE_WIDTH = 86;
    let toProfileText = post.toProfile && post.toProfile !== post.profileid ?
        <ProfilePhotoCircle profileid={post.toProfile} small={true} /> : undefined;
    let cleanContent = post.content.replace(/@[A-z]+:.+\w/g, '').trim();
    const navigation = useNavigation();
    //cleanContent = convertLinks(cleanContent);
    const newComentAdded = (commentData) => {
        let newPostObj = { ...post };
        newPostObj.comments.push(commentData);
        changePost(newPostObj);
    };
    const newPostReaction = () => {
        let newPostObj = { ...post };
        if (!newPostObj.reactions[viewer._id]) {
            changeLikes(likes + 1);
            newPostObj.reactions[viewer._id] = { type: "like" };
            API.newPostReaction(post._id);
            posthog.capture(
                'post_clicked',
                {
                    post_id: post._id,
                }
            );
        } else {
            changeLikes(likes - 1);
            delete newPostObj.reactions[viewer._id];
            API.removePostReaction(viewer._id);
        }
        changePost(newPostObj);
    }
    const newPostBookmark = () => {
        if (!post.bookmarks || !post.bookmarks.includes(viewer._id)) {
            changeBookmarked(true);
            if (!post.bookmarks) post.bookmarks = [];
            post.bookmarks.push(viewer._id);
            API.newPostBookmark(post._id);
        } else {
            changeBookmarked(false);
            post.bookmarks = post.bookmarks.filter(id => id != viewer._id);
            API.removePostBookmark(post._id)
        }
    }
    const renderComment = ({ item }) => (
        <Comment comment={item} postid={post._id} />
    );
    const handleTagPress = (tag) => {
        // Alert.alert("tag pressed", `You pressed the tag: ${tag}`);
        // You can navigate to another screen or perform any other action here
        //remove hastag from tag
        tag = tag.replace("#", "");
        navigation.navigate("Tags", { tag: tag });
    };
    const handleLinkPress = (url) => {
        Linking.canOpenURL(url)
            .then((supported) => {
                if (supported) {
                    Linking.openURL(url);
                } else {
                    Alert.alert('Error', 'Unable to open the link.');
                }
            })
            .catch((err) => console.error('An error occurred', err));
    };
    const handleLinkLongPress = (url) => {
        Share.share({
            url: url
        });
    };
    const closeSwipe = () => {
        Animated.spring(swipeX, { toValue: 0, useNativeDriver: true }).start();
    };
    const deletePost = async () => {
        const result = await API.deletePost(post._id);
        if (result?.status !== "ok") {
            Alert.alert("Could not delete post", result?.status || "Please try again.");
            return closeSwipe();
        }
        setDeleted(true);
    };
    const confirmDelete = () => {
        Alert.alert(
            "Delete post?",
            "This action cannot be undone.",
            [
                { text: "Cancel", style: "cancel", onPress: closeSwipe },
                { text: "Delete", style: "destructive", onPress: deletePost },
            ]
        );
    };
    const panResponder = useMemo(() => PanResponder.create({
        onMoveShouldSetPanResponder: (_, gestureState) =>
            isOwner &&
            Math.abs(gestureState.dx) > 8 &&
            Math.abs(gestureState.dx) > Math.abs(gestureState.dy),
        onPanResponderMove: (_, gestureState) => {
            if (gestureState.dx > 0) {
                swipeX.setValue(0);
                return;
            }
            swipeX.setValue(Math.max(gestureState.dx, -SWIPE_WIDTH));
        },
        onPanResponderRelease: (_, gestureState) => {
            const open = gestureState.dx < -SWIPE_WIDTH / 2;
            Animated.spring(swipeX, {
                toValue: open ? -SWIPE_WIDTH : 0,
                useNativeDriver: true,
            }).start();
        },
        onPanResponderTerminate: closeSwipe,
    }), [isOwner, swipeX]);
    if (deleted) return null;

    const postCard = (
        <Card style={styles.card}>
            <Card.Content style={{
                padding: 0,
                margin: 0,
                marginBottom: 0
            }}>

                {!post.nonOrganicType ?
                    <View>
                        <ProfilePhotoCircle profileid={post.profileid} />
                        <View style={{ flexDirection: 'row', alignItems: 'center', margin: 0, marginLeft: 37, marginTop: -14, paddingBottom: 2 }}>
                            {toProfileText}

                        </View>
                        <Pressable onLongPress={() => {
                            if (cleanContent.length > 10) {
                                Share.share({
                                    message: cleanContent
                                });
                            }
                        }}>
                            <ParsedText
                                style={styles.text}
                                parse={[
                                    { pattern: /#(\w+)/, style: styles.tag, onPress: handleTagPress },
                                    { pattern: /(https?:\/\/[^\s]+)/, style: styles.link, onPress: handleLinkPress, onLongPress: handleLinkLongPress },
                                ]}
                            >
                                {cleanContent}
                            </ParsedText>
                        </Pressable>

                        <Media content={post.content} postId={post._id} post={post} style={{ paddingTop: 2 }} />
                    </View> :
                    <View>
                        <Chip icon="new-releases" style={{ width: 100 }} >{i18n.t("message.news")}</Chip>
                        <Text style={{ fontSize: 18 }}>{cleanContent}</Text>
                        <Media content={post.content} />
                    </View>
                }
            </Card.Content>
            <Card.Actions style={{ flexDirection: "row", flow: 4, fontSize: 16, marginLeft: 36, marginTop: -10 }}>
                <Button
                    icon={post.reactions[viewer._id] ? "favorite" : "favorite-border"}
                    labelStyle={{ fontSize: 17 }}
                    style={{ flow: 1 }}
                    onPress={newPostReaction}
                    color="#555"
                >
                    {likes}
                </Button>
                <Button icon="forum" labelStyle={{ fontSize: 17 }} style={{ flow: 1 }}
                    onPress={() => {
                        // changeshowCommentsB(!showCommentsB) // Show comments
                        // Change view to single post
                        navigation.navigate("SinglePost", {
                            postid: post._id,
                        });
                    }}
                    color="#555"
                >
                    {post.comments.length}
                </Button>
                <Button icon="ios-share" style={{ flow: 1 }} labelStyle={{ fontSize: 17 }}
                    color="#555"
                    onPress={() => {
                        Share.share({
                            //message: "https://social.emmint.com/post/" + props.post._id,
                            url: "https://social.emmint.com/feed/post/" + props.post._id
                        });
                    }}></Button>
                <Button
                    icon={!bookmarked ? "bookmark-outline" : "bookmark"}
                    style={{ flow: 1 }}
                    labelStyle={{ fontSize: 17 }}
                    onPress={newPostBookmark}
                    color="#555"
                >
                </Button>
                <Text style={{ fontWeight: 'normal', fontSize: 12 }}>
                    {" " + Moment(post.createdAt).fromNow()}
                </Text>
            </Card.Actions>
            {showCommentsB && <NewComment postid={post._id} newComentAdded={newComentAdded} />}
            {
                showCommentsB &&
                <FlatList
                    data={post.comments}
                    renderItem={renderComment}
                    keyExtractor={item => item.createdAt}
                />
            }
        </Card>
    );
    if (!isOwner) return postCard;

    return (
        <View style={styles.swipeWrap}>
            <View style={styles.deleteActionWrap}>
                <Pressable style={styles.deleteActionBtn} onPress={confirmDelete}>
                    <Text style={styles.deleteActionText}>Delete</Text>
                </Pressable>
            </View>
            <Animated.View style={{ transform: [{ translateX: swipeX }] }} {...panResponder.panHandlers}>
                {postCard}
            </Animated.View>
        </View>
    );
}

export default React.memo(Post);

const styles = StyleSheet.create({
    userName: {
        fontSize: 14,
        fontWeight: 'bold',
        marginBottom: 5,
        fontSize: 17,
    },
    card: {
        margin: 0,
        backgroundColor: "#FAFAFA",
        borderRadius: 0,
        marginBottom: 2,
        padding: 0
    },
    swipeWrap: {
        position: "relative",
        backgroundColor: "#edf2f7",
    },
    deleteActionWrap: {
        position: "absolute",
        right: 0,
        top: 0,
        bottom: 2,
        width: 86,
        justifyContent: "center",
        alignItems: "center",
        backgroundColor: "#b3261e",
    },
    deleteActionBtn: {
        width: "100%",
        height: "100%",
        justifyContent: "center",
        alignItems: "center",
    },
    deleteActionText: {
        color: "#fff",
        fontWeight: "700",
    },
    comment: {
        margin: 8,
        marginTop: 0,
        padding: 8
    },
    text: {
        fontSize: 16,
        padding: 3, 
        paddingLeft: 40 
    },
    tag: {
        color: '#77B5FE',
        textDecorationLine: 'underline',
    },
    link: {
        color: '#77B5FE',
        textDecorationLine: 'underline',
    },
});