import { StatusBar } from 'expo-status-bar';
import React, { useState, useEffect } from 'react';
import { View, ActivityIndicator, StyleSheet, SafeAreaView, FlatList, Alert } from 'react-native';
import { Button, IconButton } from 'react-native-paper';
import API from './../API.js';
import Post from './../components/Post.js';
import NewPost from "./../components/NewPost.js";
import ProfileHeader from '../components/ProfileHeader.js';
import AsyncStorage from '@react-native-async-storage/async-storage';
import { useSnapshot } from 'valtio';
import GlobalState from '../contexts/GlobalState.js';

const PROFILE_LOG_PREFIX = '[Profile]';
const logProfile = (...args) => {
    if (__DEV__) console.log(PROFILE_LOG_PREFIX, ...args);
};

const storeProfilePosts = async (profileid, value) => {
    try {
        const jsonValue = JSON.stringify(value)
        await AsyncStorage.setItem('profile_' + profileid, jsonValue)
    } catch (e) {
    }
}

const getProfilePosts = async (profileid) => {
    try {
        const value = await AsyncStorage.getItem('profile_' + profileid)
        if (value !== null) {
            return JSON.parse(value);
        }
        return [];
    } catch (e) {
        console.log('fail getProfilePosts', e)
        return [];
    }
}

let Profile = ({ navigation, route }) => {
    const viewer = useSnapshot(GlobalState).me || {};
    let [Posts, setPosts] = useState([]);
    let [profile, setProfile] = useState({});
    const [showNewPost, setShowNewPost] = useState(false);
    const [tag, setTag] = useState('');
    const [loading, setLoading] = useState(true);
    const [isDeletingGroup, setIsDeletingGroup] = useState(false);

    const isOwnedGroup = !!(
        profile?._id &&
        profile?.isGroup &&
        String(profile?.userid || '') === String(viewer?.userid || '')
    );

    useEffect(() => {
        let subscribed = true;
        const getData = async () => {
            logProfile('load:start', {
                profileid: route?.params?.profileid || null,
                tag,
            });
            setLoading(true);
            setPosts([]);
            if (route.params && route.params.profileid && tag == '') {
                logProfile('cache:read:start', { profileid: route.params.profileid });
                await API.getUserProfile(route.params.profileid).then((profileObj) => {
                    if(!subscribed) return 0;
                    const nextProfile = profileObj && profileObj._id ? profileObj : {};
                    const profileData = nextProfile.profile || {};
                    setProfile(nextProfile);
                    navigation.setOptions({ title: (profileData.firstName || "") + " " + (profileData.lastName || "") });
                    logProfile('profile:loaded', {
                        profileid: nextProfile._id || route.params.profileid,
                        hasName: !!(profileData.firstName || profileData.lastName),
                    });
                });
                await getProfilePosts(route.params.profileid).then((cachedPosts) => {
                    const safeCachedPosts = Array.isArray(cachedPosts) ? cachedPosts : [];
                    setPosts(safeCachedPosts);
                    logProfile('cache:read:end', {
                        profileid: route.params.profileid,
                        count: safeCachedPosts.length,
                    });
                });
                API.getPosts(route.params.profileid).then((data) => {
                    if(!subscribed) return 0;
                    const safePosts = Array.isArray(data) ? data : [];
                    setPosts(safePosts);
                    storeProfilePosts(route.params.profileid, safePosts);
                    setLoading(false);
                    logProfile('network:loaded', {
                        profileid: route.params.profileid,
                        count: safePosts.length,
                        cached: true,
                    });
                });
            } else {
                if(route.params && route.params.profileid){
                    logProfile('tag:load:start', {
                        profileid: route.params.profileid,
                        tag,
                    });
                    API.getPostsWithTag(route.params.profileid, tag).then((data) => {
                        if(!subscribed) return 0;
                        const safeTagPosts = Array.isArray(data?.posts) ? data.posts : [];
                        setPosts(safeTagPosts);
                        setLoading(false);
                        logProfile('tag:load:end', {
                            profileid: route.params.profileid,
                            tag,
                            count: safeTagPosts.length,
                        });
                    });
                } else {
                    // if no profile information is pressent should load feed
                    logProfile('redirect:feed');
                    navigation.navigate('Feed')
                }
            }
            logProfile('load:end');
        }
        getData();
        return ()=>{
            subscribed = false;
            logProfile('load:cleanup');
        }
    }, [tag, route.params?.profileid]);

    const getTagPosts = ()=>{
        API.getPostsWithTag(tag).then((data) => {
            //if(!subscribed) return 0;
            console.log(data.posts);
            setPosts(Array.isArray(data?.posts) ? data.posts : []);
        });
    }

    const renderPost = (({ item }) => {
        if (item.nonOrganicType)
            return (<></>);
        return (<Post post={item} />);
    });

    const handleDeleteGroup = () => {
        if (!profile?._id || isDeletingGroup) return;
        Alert.alert(
            "Delete group?",
            "This will permanently delete this group profile.",
            [
                { text: "Cancel", style: "cancel" },
                {
                    text: "Delete",
                    style: "destructive",
                    onPress: async () => {
                        setIsDeletingGroup(true);
                        try {
                            const result = await API.deleteProfile(profile._id);
                            if (result?.status !== "ok") {
                                return Alert.alert("Could not delete group", result?.status || "Please try again.");
                            }
                            const me = await API.getMe();
                            if (me && me._id) GlobalState.me = me;

                            if (navigation.canGoBack()) {
                                navigation.goBack();
                            } else {
                                navigation.reset({
                                    index: 0,
                                    routes: [{ name: 'MainNavigation' }],
                                });
                            }
                        } catch (error) {
                            Alert.alert("Could not delete group", "Please try again.");
                        } finally {
                            setIsDeletingGroup(false);
                        }
                    }
                }
            ]
        );
    };

    const header = (
        <View>
            <ProfileHeader profileObj={profile} key={profile._id} />
            <View style={{
                flexDirection: "row", 
                alignItems:"center", 
                justifyContent: "space-evenly",
                paddingTop: 10
            }}>
                <View style={{
                            height: 40,
                            width: 40,
                            top: 0,
                            borderRadius: 28,
                            backgroundColor: "#c44d56",
                            justifyContent: 'center',
                            alignItems: 'center',
                            elevation: 10,
                            zIndex: 1,
                           }}>
                    <IconButton icon={showNewPost ? 'remove' : "add"} mode="outlined" color="white" onPress={()=>{
                        //setShowNewPost(!showNewPost);
                        navigation.navigate('NewPost', {toProfile: profile._id})
                    }} />
                </View>
                <Button style={{paddingLeft:12, backgroundColor:"#fff"}} title="Images" icon={tag == 'images' ? 'remove' : "image"} mode="outlined" onPress={()=>{
                    if(tag == 'images') return setTag('');
                    setTag('images');
                }}>{tag == 'images' ? "Images" : ''}</Button>
                <Button style={{paddingLeft:12, backgroundColor:"#fff"}} title="Media" icon={tag == 'media' ? 'remove' : "subscriptions"} mode="outlined" onPress={()=>{
                    if(tag == 'media') return setTag('');
                    setTag('media');
                }}>{tag == 'media' ? "Media" : ''}</Button>
                <Button style={{paddingLeft:12, backgroundColor:"#fff"}} title="Embedded" icon={tag == 'embedded' ? 'remove' : "folder"} mode="outlined" onPress={()=>{
                    if(tag == 'embedded') return setTag('');
                    setTag('embedded');
                }}>{tag == 'embedded' ? "Files" : ''}</Button>
            </View>
            {isOwnedGroup ? (
                <View style={styles.deleteGroupRow}>
                    <Button
                        mode="contained"
                        icon="delete"
                        buttonColor="#b3261e"
                        loading={isDeletingGroup}
                        disabled={isDeletingGroup}
                        onPress={handleDeleteGroup}
                    >
                        Delete Group
                    </Button>
                </View>
            ) : <></>}
            { showNewPost ? 
                <NewPost newPostCB={(newPost) => setPosts([newPost, ...Posts])} />
                : <></>
            }
        </View>
    )

    return (
        <SafeAreaView style={styles.container}>
            <View>
                {(Posts.length !== 0 || profile._id) ?
                    <FlatList
                        data={Posts}
                        renderItem={renderPost}
                        keyExtractor={item => item.lastUpdated || item._id  || item.createdAt}
                        ListHeaderComponent={header}
                        refreshing={loading}
                        initialNumToRender={3}
                        maxToRenderPerBatch={3}
                        removeClippedSubviews={true}
                        onRefresh={() => {
                            logProfile('refresh:start', {
                                profileid: route?.params?.profileid || null,
                                tag,
                            });
                            setLoading(true);
                            Promise.all([
                                API.getUserProfile(route.params.profileid, true),
                                API.getPosts(route.params.profileid),
                            ]).then(([profileObj, data]) => {
                                const nextProfile = profileObj && profileObj._id ? profileObj : {};
                                const profileData = nextProfile.profile || {};
                                const safePosts = Array.isArray(data) ? data : [];
                                setProfile(nextProfile);
                                navigation.setOptions({ title: (profileData.firstName || "") + " " + (profileData.lastName || "") });
                                setPosts(safePosts);
                                storeProfilePosts(route.params.profileid, safePosts);
                                setLoading(false);
                                logProfile('refresh:end', {
                                    profileid: route.params.profileid,
                                    count: safePosts.length,
                                    cached: false,
                                });
                            }).catch(() => {
                                setLoading(false);
                            });
                        }}
                    /> :
                    <></> //TODO: Add empty profile card here
                }
            </View>
            <StatusBar style="auto" />
        </SafeAreaView>
    );
}

export default Profile;

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: "#edf2f7",
    },
    deleteGroupRow: {
        paddingHorizontal: 12,
        paddingTop: 12,
    },
});