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

import * as Utils from './utils.jsx';
import ChannelInviteModal from 'components/channel_invite_modal.jsx';
import EditChannelHeaderModal from 'components/edit_channel_header_modal.jsx';
import ToggleModalButton from 'components/toggle_modal_button.jsx';
import UserProfile from 'components/user_profile.jsx';
import ChannelStore from 'stores/channel_store.jsx';
import Constants from 'utils/constants.jsx';
import * as GlobalActions from 'action_creators/global_actions.jsx';

import React from 'react';
import {FormattedMessage, FormattedHTMLMessage, FormattedDate} from 'react-intl';

export function createChannelIntroMessage(channel) {
    if (channel.type === 'D') {
        return createDMIntroMessage(channel);
    } else if (ChannelStore.isDefault(channel)) {
        return createDefaultIntroMessage(channel);
    } else if (channel.name === Constants.OFFTOPIC_CHANNEL) {
        return createOffTopicIntroMessage(channel);
    } else if (channel.type === 'O' || channel.type === 'P') {
        return createStandardIntroMessage(channel);
    }
    return null;
}

export function createDMIntroMessage(channel) {
    var teammate = Utils.getDirectTeammate(channel.id);

    if (teammate) {
        var teammateName = teammate.username;
        if (teammate.nickname.length > 0) {
            teammateName = teammate.nickname;
        }

        return (
            <div className='channel-intro'>
                <div className='post-profile-img__container channel-intro-img'>
                    <img
                        className='post-profile-img'
                        src={'/api/v1/users/' + teammate.id + '/image?time=' + teammate.update_at}
                        height='50'
                        width='50'
                    />
                </div>
                <div className='channel-intro-profile'>
                    <strong>
                        <UserProfile user={teammate}/>
                    </strong>
                </div>
                <p className='channel-intro-text'>
                    <FormattedHTMLMessage
                        id='intro_messages.DM'
                        defaultMessage='This is the start of your direct message history with {teammate}.<br />Direct messages and files shared here are not shown to people outside this area.'
                        values={{
                            teammate: teammateName
                        }}
                    />
                </p>
                {createSetHeaderButton(channel)}
            </div>
        );
    }

    return (
        <div className='channel-intro'>
            <p className='channel-intro-text'>
                <FormattedMessage
                    id='intro_messages.teammate'
                    defaultMessage='This is the start of your direct message history with this teammate. Direct messages and files shared here are not shown to people outside this area.'
                />
            </p>
        </div>
    );
}

export function createOffTopicIntroMessage(channel) {
    return (
        <div className='channel-intro'>
            <FormattedHTMLMessage
                id='intro_messages.offTopic'
                defaultMessage='<h4 class="channel-intro__title">Beginning of {display_name}</h4><p class="channel-intro__content">This is the start of {display_name}, a channel for non-work-related conversations.<br/></p>'
                values={{
                    display_name: channel.display_name
                }}
            />
            {createSetHeaderButton(channel)}
            {createInviteChannelMemberButton(channel, 'channel')}
        </div>
    );
}

export function createDefaultIntroMessage(channel) {
    const inviteModalLink = (
        <a
            className='intro-links'
            href='#'
            onClick={GlobalActions.showGetTeamInviteLinkModal}
        >
            <i className='fa fa-user-plus'></i>
            <FormattedMessage
                id='intro_messages.inviteOthers'
                defaultMessage='Invite others to this team'
            />
        </a>
    );

    return (
        <div className='channel-intro'>
            <FormattedHTMLMessage
                id='intro_messages.default'
                defaultMessage="<h4 class='channel-intro__title'>Beginning of {display_name}</h4><p class='channel-intro__content'><strong>Welcome to {display_name}!</strong><br/><br/>This is the first channel teammates see when they sign up - use it for posting updates everyone needs to know.</p>"
                values={{
                    display_name: channel.display_name
                }}
            />
            {inviteModalLink}
            {createSetHeaderButton(channel)}
            <br/>
        </div>
    );
}

export function createStandardIntroMessage(channel) {
    var uiName = channel.display_name;
    var creatorName = '';

    var uiType;
    var memberMessage;
    if (channel.type === 'P') {
        uiType = (
            <FormattedMessage
                id='intro_messages.group'
                defaultMessage='private group'
            />
        );
        memberMessage = (
            <FormattedMessage
                id='intro_messages.onlyInvited'
                defaultMessage=' Only invited members can see this private group.'
            />
        );
    } else {
        uiType = (
            <FormattedMessage
                id='intro_messages.channel'
                defaultMessage='channel'
            />
        );
        memberMessage = (
            <FormattedMessage
                id='intro_messages.anyMember'
                defaultMessage=' Any member can join and read this channel.'
            />
        );
    }

    const date = (
        <FormattedDate
            value={channel.create_at}
            month='long'
            day='2-digit'
            year='numeric'
        />
    );

    var createMessage;
    if (creatorName === '') {
        createMessage = (
            <FormattedMessage
                id='intro_messages.noCreator'
                defaultMessage='This is the start of the {name} {type}, created on {date}.'
                values={{
                    name: (uiName),
                    type: (uiType),
                    date: (date)
                }}
            />
        );
    } else {
        createMessage = (
            <span>
                <FormattedHTMLMessage
                    id='intro_messages.creator'
                    defaultMessage='This is the start of the <strong>{name}</strong> {type}, created by <strong>{creator}</strong> on <strong>{date}</strong>'
                    values={{
                        name: (uiName),
                        type: (uiType),
                        date: (date),
                        creator: creatorName
                    }}
                />
            </span>
        );
    }

    return (
        <div className='channel-intro'>
            <h4 className='channel-intro__title'>
                <FormattedMessage
                    id='intro_messages.beginning'
                    defaultMessage='Beginning of {name}'
                    values={{
                        name: (uiName)
                    }}
                />
            </h4>
            <p className='channel-intro__content'>
                {createMessage}
                {memberMessage}
                <br/>
            </p>
            {createSetHeaderButton(channel)}
            {createInviteChannelMemberButton(channel, uiType)}
        </div>
    );
}

function createInviteChannelMemberButton(channel, uiType) {
    return (
        <ToggleModalButton
            className='intro-links'
            dialogType={ChannelInviteModal}
            dialogProps={{channel}}
        >
            <i className='fa fa-user-plus'></i>
            <FormattedMessage
                id='intro_messages.invite'
                defaultMessage='Invite others to this {type}'
                values={{
                    type: (uiType)
                }}
            />
        </ToggleModalButton>
    );
}

function createSetHeaderButton(channel) {
    return (
        <ToggleModalButton
            className='intro-links'
            dialogType={EditChannelHeaderModal}
            dialogProps={{channel}}
        >
            <i className='fa fa-pencil'></i>
            <FormattedMessage
                id='intro_messages.setHeader'
                defaultMessage='Set a Header'
            />
        </ToggleModalButton>
    );
}