// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

import React, {useCallback, useEffect, useMemo, useRef, useState} from 'react';
import {useIntl} from 'react-intl';
import {DeviceEventEmitter, Keyboard, Platform, StyleSheet, View} from 'react-native';
import {KeyboardAwareScrollView} from 'react-native-keyboard-aware-scroll-view';
import {Edge, SafeAreaView} from 'react-native-safe-area-context';

import {updateLocalUser} from '@actions/local/user';
import {setDefaultProfileImage, updateMe, uploadUserProfileImage} from '@actions/remote/user';
import CompassIcon from '@components/compass_icon';
import TabletTitle from '@components/tablet_title';
import {Events} from '@constants';
import {useServerUrl} from '@context/server';
import {useTheme} from '@context/theme';
import useAndroidHardwareBackHandler from '@hooks/android_back_handler';
import useNavButtonPressed from '@hooks/navigation_button_pressed';
import {dismissModal, popTopScreen, setButtons} from '@screens/navigation';
import {preventDoubleTap} from '@utils/tap';

import ProfileForm from './components/form';
import ProfileError from './components/profile_error';
import Updating from './components/updating';
import UserProfilePicture from './components/user_profile_picture';

import type {EditProfileProps, NewProfileImage, UserInfo} from '@typings/screens/edit_profile';

const edges: Edge[] = ['bottom', 'left', 'right'];

const styles = StyleSheet.create({
    flex: {
        flex: 1,
    },
    top: {
        marginVertical: 32,
        alignItems: 'center',
        justifyContent: 'center',
    },
});

const CLOSE_BUTTON_ID = 'close-edit-profile';
const UPDATE_BUTTON_ID = 'update-profile';

const EditProfile = ({
    componentId, currentUser, isModal, isTablet,
    lockedFirstName, lockedLastName, lockedNickname, lockedPosition, lockedPicture,
}: EditProfileProps) => {
    const intl = useIntl();
    const serverUrl = useServerUrl();
    const theme = useTheme();
    const changedProfilePicture = useRef<NewProfileImage | undefined>(undefined);
    const scrollViewRef = useRef<KeyboardAwareScrollView>();
    const hasUpdateUserInfo = useRef<boolean>(false);
    const [userInfo, setUserInfo] = useState<UserInfo>({
        email: currentUser.email,
        firstName: currentUser.firstName,
        lastName: currentUser.lastName,
        nickname: currentUser.nickname,
        position: currentUser.position,
        username: currentUser.username,
    });
    const [canSave, setCanSave] = useState(false);
    const [error, setError] = useState<ErrorText | undefined>();
    const [updating, setUpdating] = useState(false);

    const buttonText = intl.formatMessage({id: 'mobile.account.settings.save', defaultMessage: 'Save'});
    const rightButton = useMemo(() => {
        return isTablet ? null : {
            id: 'update-profile',
            enabled: false,
            showAsAction: 'always' as const,
            testID: 'edit_profile.save.button',
            color: theme.sidebarHeaderTextColor,
            text: buttonText,
        };
    }, [isTablet, theme.sidebarHeaderTextColor]);

    const leftButton = useMemo(() => {
        return isTablet ? null : {
            id: CLOSE_BUTTON_ID,
            icon: CompassIcon.getImageSourceSync('close', 24, theme.centerChannelColor),
            testID: 'close.edit_profile.button',
        };
    }, [isTablet, theme.centerChannelColor]);

    useEffect(() => {
        if (!isTablet) {
            setButtons(componentId, {
                rightButtons: [rightButton!],
                leftButtons: [leftButton!],
            });
        }
    }, []);

    const close = useCallback(() => {
        if (isModal) {
            dismissModal({componentId});
        } else if (isTablet) {
            DeviceEventEmitter.emit(Events.ACCOUNT_SELECT_TABLET_VIEW, '');
        } else {
            popTopScreen(componentId);
        }
    }, []);
    const enableSaveButton = useCallback((value: boolean) => {
        if (!isTablet) {
            const buttons = {
                rightButtons: [{
                    ...rightButton!,
                    enabled: value,
                }],
            };
            setButtons(componentId, buttons);
        }
        setCanSave(value);
    }, [componentId, rightButton]);
    const submitUser = useCallback(preventDoubleTap(async () => {
        enableSaveButton(false);
        setError(undefined);
        setUpdating(true);
        try {
            const newUserInfo: Partial<UserProfile> = {
                email: userInfo.email,
                first_name: userInfo.firstName,
                last_name: userInfo.lastName,
                nickname: userInfo.nickname,
                position: userInfo.position,
                username: userInfo.username,
            };
            const localPath = changedProfilePicture.current?.localPath;
            const profileImageRemoved = changedProfilePicture.current?.isRemoved;
            if (localPath) {
                const now = Date.now();
                const {error: uploadError} = await uploadUserProfileImage(serverUrl, localPath);
                if (uploadError) {
                    resetScreen(uploadError as Error);
                    return;
                }
                updateLocalUser(serverUrl, {last_picture_update: now});
            } else if (profileImageRemoved) {
                await setDefaultProfileImage(serverUrl, currentUser.id);
            }

            if (hasUpdateUserInfo.current) {
                const {error: reqError} = await updateMe(serverUrl, newUserInfo);
                if (reqError) {
                    resetScreen(reqError as Error);
                    return;
                }
            }

            close();
            return;
        } catch (e) {
            resetScreen(e as Error);
        }
    }), [userInfo, enableSaveButton]);

    useAndroidHardwareBackHandler(componentId, close);
    useNavButtonPressed(UPDATE_BUTTON_ID, componentId, submitUser, [userInfo]);
    useNavButtonPressed(CLOSE_BUTTON_ID, componentId, close, []);

    const onUpdateProfilePicture = useCallback((newProfileImage: NewProfileImage) => {
        changedProfilePicture.current = newProfileImage;
        enableSaveButton(true);
    }, [enableSaveButton]);

    const onUpdateField = useCallback((fieldKey: string, name: string) => {
        const update = {...userInfo};
        update[fieldKey] = name;
        setUserInfo(update);

        // @ts-expect-error access object property by string key
        const currentValue = currentUser[fieldKey];
        const didChange = currentValue !== name;
        hasUpdateUserInfo.current = currentValue !== name;
        enableSaveButton(didChange);
    }, [userInfo, currentUser, enableSaveButton]);

    const resetScreen = useCallback((resetError: Error) => {
        setError(resetError?.message);
        Keyboard.dismiss();
        setUpdating(false);
        enableSaveButton(true);
        scrollViewRef.current?.scrollToPosition(0, 0, true);
    }, [enableSaveButton]);

    return (
        <>
            {isTablet &&
                <TabletTitle
                    action={buttonText}
                    enabled={canSave}
                    onPress={submitUser}
                    testID='edit_profile'
                    title={intl.formatMessage({id: 'mobile.screen.your_profile', defaultMessage: 'Your Profile'})}
                />
            }
            <SafeAreaView
                edges={edges}
                style={styles.flex}
                testID='edit_profile.screen'
            >
                <KeyboardAwareScrollView
                    bounces={false}
                    enableAutomaticScroll={Platform.select({ios: true, default: false})}
                    enableOnAndroid={true}
                    enableResetScrollToCoords={true}
                    extraScrollHeight={Platform.select({ios: 45})}
                    keyboardOpeningTime={0}
                    keyboardDismissMode='none'
                    keyboardShouldPersistTaps='handled'
                    scrollToOverflowEnabled={true}
                    testID='edit_profile.scroll_view'
                    style={styles.flex}
                >
                    {updating && <Updating/>}
                    {Boolean(error) && <ProfileError error={error!}/>}
                    <View style={styles.top}>
                        <UserProfilePicture
                            currentUser={currentUser}
                            lockedPicture={lockedPicture}
                            onUpdateProfilePicture={onUpdateProfilePicture}
                        />
                    </View>
                    <ProfileForm
                        canSave={canSave}
                        currentUser={currentUser}
                        isTablet={isTablet}
                        lockedFirstName={lockedFirstName}
                        lockedLastName={lockedLastName}
                        lockedNickname={lockedNickname}
                        lockedPosition={lockedPosition}
                        onUpdateField={onUpdateField}
                        userInfo={userInfo}
                        submitUser={submitUser}
                    />
                </KeyboardAwareScrollView>
            </SafeAreaView>
        </>
    );
};

export default EditProfile;
