import {BSON} from "realm";
import {Button, Paragraph, useTheme} from "react-native-paper";
import {Globe, History, Plus, ServerOff} from "lucide-react-native";
import {Alert, FlatList, NativeSyntheticEvent, Text, View} from "react-native";
import React, {useCallback, useEffect, useLayoutEffect, useMemo, useState} from "react";
import ContextMenu, {ContextMenuOnPressNativeEvent} from "react-native-context-menu-view";
import {EmptyStatePlaceholder} from "../components/EmptyStatePlaceholder";
import {AMUICard, AMUICardDetail} from "../components/AMUICard";
import TimeAgo from "../components/TimeAgo";

import RealmContext from "../models/RealmContext";
import {AMServer} from "../models/AMServer";
import ObjectId = BSON.ObjectId;

const {useRealm, useQuery} = RealmContext;

function ServerCard(props: { server: AMServer, navigation: any }) {
    const realm = useRealm();
    const pageCallback = useCallback(() => {
        props.navigation.navigate('server', {
            serverId: props.server._id.toHexString()
        });
    }, [props.navigation, props.server]);

    const pageContextMenuCallback = useCallback((action: NativeSyntheticEvent<ContextMenuOnPressNativeEvent>) => {
        switch (action.nativeEvent.index) {
            case 0:
                pageCallback();
                break;

            case 1:
                realm.write(() => {
                    realm.delete(props.server);
                });
                break;
        }
    }, [realm, props.server]);

    return (
        <ContextMenu onPress={pageContextMenuCallback} actions={[
            {title: `Select ${props.server.serverName}`, systemIcon: "chevron.right"},
            {title: "Delete Server", systemIcon: "trash", destructive: true}
        ]}>
            <AMUICard title={props.server.serverName} onPress={pageCallback}>
                <AMUICardDetail>
                    <Globe size={18} color="gray"/>
                    <Text style={{color: "gray", fontFamily: "JetBrainsMono_400Regular"}}>
                        {props.server.serverAddress}
                    </Text>
                </AMUICardDetail>
                <AMUICardDetail>
                    <History size={18} color="gray"/>
                    {props.server.lastUsed
                        ? (<TimeAgo style={{color: "gray"}} dateTo={props.server.lastUsed}/>)
                        : (<Paragraph style={{color: "gray"}}>never</Paragraph>)}
                </AMUICardDetail>
            </AMUICard>
        </ContextMenu>
    )
}

export default function ServerManager({route, navigation}) {
    const realm = useRealm();
    const theme = useTheme();
    const [searchQuery, setSearchQuery] = useState('');

    const query = useQuery(AMServer);
    const servers = useMemo(() => {
        let q = query;

        if (searchQuery !== '') {
            q = q.filtered("serverName CONTAINS[c] $0 OR serverAddress CONTAINS[c] $0", searchQuery);
        }

        return q.sorted("lastUsed");
    }, [query, searchQuery]);

    // enable searchbar
    useLayoutEffect(() => {
        navigation.setOptions({
            headerSearchBarOptions: {
                type: "text",
                value: searchQuery,
                autoCorrect: "none",
                autoCapitalize: "none",
                onChangeText: e => setSearchQuery(e.nativeEvent.text)
            },
        })
    }, [navigation, setSearchQuery]);

    // handle deep links once/render
    useEffect(() => {
        handleDeepLink(realm, navigation, route);
    }, []);

    if (!servers.length) {
        return (
            <View style={{gap: 10, flex: 1, justifyContent: "center", alignItems: "center"}}>
                <EmptyStatePlaceholder message="No servers found" icon={<ServerOff color="gray"/>}/>
                {(!searchQuery || !query.length) && (
                    <Button mode="text" onPress={() => navigation.navigate('add-server')}
                            icon={() => <Plus size={18} color={theme.colors.primary}/>}>Add Server</Button>)}
            </View>
        );
    }

    return (
        <FlatList contentInsetAdjustmentBehavior="always"
                  data={servers}
                  keyExtractor={i => i._id.toString()}
                  style={{padding: 16, paddingTop: 24}}
                  contentContainerStyle={{paddingBottom: 40}}
                  ItemSeparatorComponent={() => <View style={{height: 15}}/>}
                  renderItem={i => <ServerCard navigation={navigation} server={i.item}/>}/>
    )
}

async function handleDeepLink(realm, navigation, route) {
    if (!route.params?.serverAddress) {
        return;
    }

    let serverId: ObjectId;

    const serverUrl = decodeURIComponent(route.params.serverAddress);
    const item = realm.objects(AMServer).filtered("serverAddress = $0", serverUrl);

    if (item.length) {
        serverId = item[0]._id;
    } else {
        try {
            new URL(serverUrl);
            realm.write(() => {
                const newServer = realm.create(AMServer, AMServer.generate(serverUrl));
                newServer.serverName = "Imported Server";

                serverId = newServer._id;
            });
        } catch (TypeError) {
            Alert.alert("Invalid Server URL", "The server URL provided is invalid.");
        }
    }

    // clear param from route
    navigation.setParams({serverAddress: null});

    if (serverId) {
        // give it some time to let everything load (and the user sees the initial list)
        await new Promise(resolve => setTimeout(resolve, 500));
        navigation.navigate('server', {
            serverId: serverId.toHexString()
        });
    }

    return null;
}