// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.
import React, {PureComponent} from 'react';
import {Platform, Text, View} from 'react-native';

import TouchableWithFeedback from '@components/touchable_with_feedback';
import ProfilePicture from '@components/profile_picture';
import {ViewTypes} from '@constants';

import type {Theme} from '@mm-redux/types/preferences';
import {changeOpacity, makeStyleSheetFromTheme} from '@utils/theme';

const getStyleSheet = makeStyleSheetFromTheme((theme: Theme) => {
    const size = ViewTypes.AVATAR_LIST_PICTURE_SIZE;

    // compensate for the status buffer that is not rendered (but still padded)
    // by the ProfilePicture Component
    let STATUS_BUFFER = Platform.select({
        ios: 3,
        android: 2,
    });
    STATUS_BUFFER = STATUS_BUFFER || 0;
    const overflowSize = size + STATUS_BUFFER;
    const imgOverlap = -6;
    return {
        container: {
            flexDirection: 'row',
        },
        firstAvatar: {
            justifyContent: 'center',
            alignItems: 'center',
            width: size,
            height: size,
            borderWidth: (size / 2) + 1,
            borderColor: theme.centerChannelBg,
            backgroundColor: theme.centerChannelBg,
            borderRadius: size / 2,
        },
        notFirstAvatars: {
            justifyContent: 'center',
            alignItems: 'center',
            width: size,
            height: size,
            borderWidth: (size / 2) + 1,
            borderColor: theme.centerChannelBg,
            backgroundColor: theme.centerChannelBg,
            borderRadius: size / 2,
            marginLeft: imgOverlap,
        },
        overflowContainer: {
            justifyContent: 'center',
            alignItems: 'center',
            width: overflowSize,
            height: overflowSize,
            borderRadius: overflowSize / 2,
            borderWidth: 1,
            borderColor: theme.centerChannelBg,
            backgroundColor: theme.centerChannelBg,
            marginLeft: imgOverlap,
        },
        overflowItem: {
            justifyContent: 'center',
            alignItems: 'center',
            width: overflowSize,
            height: overflowSize,
            borderRadius: overflowSize / 2,
            borderWidth: 1,
            borderColor: theme.centerChannelBg,
            backgroundColor: changeOpacity(theme.centerChannelColor, 0.08),
        },
        overflowText: {
            fontSize: 10,
            color: changeOpacity(theme.centerChannelColor, 0.64),
            textAlign: 'center',
        },
    };
});

const OVERFLOW_DISPLAY_LIMIT = 99;

interface AvatarsProps {
    userIds: string[];
    breakAt?: number;
    theme: Theme;
}

export default class Avatars extends PureComponent<AvatarsProps> {
    static defaultProps = {
        breakAt: 3,
    };

    render() {
        const {userIds, breakAt, theme} = this.props;
        const displayUserIds = userIds.slice(0, breakAt);
        const overflowUsersCount = Math.min(userIds.length - displayUserIds.length, OVERFLOW_DISPLAY_LIMIT);

        const style = getStyleSheet(theme);

        return (
            <TouchableWithFeedback>
                <View style={style.container}>
                    {displayUserIds.map((userId: string, i: number) => (
                        <View
                            key={'participants' + userId}
                            style={i === 0 ? style.firstAvatar : style.notFirstAvatars}
                        >
                            <ProfilePicture
                                userId={userId}
                                size={ViewTypes.AVATAR_LIST_PICTURE_SIZE}
                                showStatus={false}
                                testID='avatars.profile_picture'
                                theme={theme}
                            />
                        </View>
                    ))}
                    {Boolean(overflowUsersCount) && (
                        <View style={style.overflowContainer}>
                            <View style={style.overflowItem}>
                                <Text style={style.overflowText} >
                                    {'+' + overflowUsersCount.toString()}
                                </Text>
                            </View>

                        </View>
                    )}
                </View>
            </TouchableWithFeedback>
        );
    }
}

