import {StatusBar} from "expo-status-bar";
import {Card, Text, useTheme} from "react-native-paper";
import {useCallback, useEffect, useLayoutEffect, useState} from "react";
import {Alert, Platform, TextInput, TouchableOpacity, View} from "react-native";

import {useModalStyles} from "../utils/ModalStyles";
import RealmContext from "../models/RealmContext";
import {AMServer} from "../models/AMServer";

const {useRealm} = RealmContext;

export default function ServerAddModal({route, navigation}) {
    const realm = useRealm();
    const theme = useTheme();
    const modalStyles = useModalStyles();

    const [serverAddress, setServerAddress] = useState('');
    
    // add option to add server address when loading a share link
    useEffect(() => {
        handleDeepLink(realm, navigation, route, setServerAddress);
    }, []);

    if (Platform.OS === 'ios') {
        useLayoutEffect(() => {
            navigation.setOptions({
                headerLeft: () => <TouchableOpacity onPress={() => navigation.goBack()}>
                    <Text variant="bodyMedium" style={modalStyles.headerText}>Cancel</Text>
                </TouchableOpacity>,
            });
        }, [navigation, modalStyles]);
    }

    useLayoutEffect(() => {
        let urlValid = false;

        try {
            const protocol = new URL(serverAddress).protocol;
            urlValid = protocol.localeCompare("http:", undefined, {sensitivity: "case"}) === 0 || protocol.localeCompare("https:", undefined, {sensitivity: "case"}) === 0;
        } catch {
            // do nothing
        }

        const themeOptions = urlValid ? modalStyles.headerText : {color: theme.colors.outline};
        navigation.setOptions({
            headerRight: () => <TouchableOpacity disabled={!urlValid} onPress={() => saveServer(serverAddress)}>
                <Text variant="bodyMedium" style={{...themeOptions, fontWeight: "600"}}>Save</Text>
            </TouchableOpacity>
        })
    }, [navigation, modalStyles, serverAddress]);

    const saveServer = useCallback(async (address: string) => {
        if (address.startsWith("https:")) {
            await new Promise<void>(done => {
                Alert.alert(
                    "HTTPS Warning",
                    "By default, AMNet doesn't support HTTPS without advanced configuration. It's highly likely you won't be able to connect.",
                    [
                        {
                            text: "Keep HTTPS",
                            style: "destructive",
                            onPress: () => done()
                        },
                        {
                            text: "Change to HTTP",
                            isPreferred: true,
                            onPress: () => {
                                address = address.replace(/^https:/i, "http:");
                                done();
                            }
                        },
                    ]);
            });
        }

        let serverObject = realm.objects<AMServer>(AMServer.schema.name).find(x => x.serverAddress == address);
        if (!serverObject) {
            realm.write(() => {
                serverObject = realm.create<AMServer>(AMServer.schema.name, AMServer.generate(address));
            });
        }

        navigation.goBack();
        setTimeout(() => {
            navigation.popTo('app', {
                screen: "servers",
                params: {
                    screen: "server",
                    params: {
                        serverId: serverObject._id.toHexString()
                    }
                }
            });
        }, 500);
    }, [realm]);

    return (<>
        {Platform.OS == 'ios' && <StatusBar style="light"/>}
        <View style={{display: "flex", gap: 10, justifyContent: "center", paddingHorizontal: 15, paddingTop: 25}}>
        <Card mode="contained">
            <Card.Content>
                <View style={{...modalStyles.formItemRow, gap: 10}}>
                    <Text variant="bodyMedium" style={{...modalStyles.formItemName, minWidth: 0}}>
                        Address
                    </Text>
                    <TextInput style={modalStyles.formItemInput}
                               autoFocus
                               numberOfLines={1}
                               keyboardType="url"
                               autoComplete="off"
                               textContentType="URL"
                               autoCapitalize="none"
                               value={serverAddress}
                               onChangeText={setServerAddress}
                               placeholder="http://192.168.1.2:6070"
                               placeholderTextColor={theme.colors.outline}/>
                </View>
            </Card.Content>
        </Card>

        <Text variant="bodyMedium" style={modalStyles.formFootnote}>
            AMNet uses HTTP by default. HTTPS will not work unless specifically configured using HTTP.SYS
        </Text>
    </View>
</>)
}

function handleDeepLink(realm, navigation, route, setAddress: (address: string) => void) {
    if (!route.params?.address) {
        return;
    }

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

    if (item.length) {
        // clear modal without animating it
        navigation.setOptions({animation: "none"});
        navigation.goBack();

        // allow the homepage to render before moving on
        setTimeout(() => navigation.popTo('server', {
            serverId: item[0]._id.toHexString()
        }), 1000);
    } else {
        setAddress(serverUrl);
    }
}