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

import UserStore from 'stores/user_store.jsx';
import TeamStore from 'stores/team_store.jsx';
import * as UserAgent from 'utils/user_agent.jsx';
import * as Utils from 'utils/utils.jsx';
import AnnouncementBar from 'components/announcement_bar';
import LoadingScreen from 'components/loading_screen.jsx';
import * as GlobalActions from 'actions/global_actions.jsx';
import SelectTeamItem from './components/select_team_item.jsx';

import {Link} from 'react-router/es6';

import {FormattedMessage} from 'react-intl';

import PropTypes from 'prop-types';

import React from 'react';
import logoImage from 'images/logo.png';

export default class SelectTeam extends React.Component {
    static propTypes = {
        actions: PropTypes.shape({
            getTeams: PropTypes.func.isRequired
        }).isRequired
    }

    constructor(props) {
        super(props);
        this.onTeamChange = this.onTeamChange.bind(this);
        this.handleTeamClick = this.handleTeamClick.bind(this);
        this.teamContentsCompare = this.teamContentsCompare.bind(this);

        const state = this.getStateFromStores(false);
        state.loadingTeamId = '';
        this.state = state;
    }

    componentDidMount() {
        TeamStore.addChangeListener(this.onTeamChange);
        this.props.actions.getTeams(0, 200);
    }

    componentWillUnmount() {
        TeamStore.removeChangeListener(this.onTeamChange);
    }

    onTeamChange() {
        this.setState(this.getStateFromStores(true));
    }

    getStateFromStores(loaded) {
        return {
            teams: TeamStore.getAll(),
            teamMembers: TeamStore.getMyTeamMembers(),
            teamListings: TeamStore.getTeamListings(),
            loaded
        };
    }

    handleTeamClick(team) {
        this.setState({loadingTeamId: team.id});
    }

    teamContentsCompare(teamItemA, teamItemB) {
        return teamItemA.props.team.display_name.localeCompare(teamItemB.props.team.display_name);
    }

    render() {
        let openTeamContents = [];
        const isAlreadyMember = new Map();
        const isSystemAdmin = Utils.isSystemAdmin(UserStore.getCurrentUser().roles);

        for (const teamMember of this.state.teamMembers) {
            const teamId = teamMember.team_id;
            isAlreadyMember[teamId] = true;
        }

        for (const id in this.state.teamListings) {
            if (this.state.teamListings.hasOwnProperty(id) && !isAlreadyMember[id]) {
                const openTeam = this.state.teamListings[id];
                openTeamContents.push(
                    <SelectTeamItem
                        key={'team_' + openTeam.name}
                        team={openTeam}
                        onTeamClick={this.handleTeamClick}
                        loading={this.state.loadingTeamId === openTeam.id}
                    />
                );
            }
        }

        if (openTeamContents.length === 0 && (global.window.mm_config.EnableTeamCreation === 'true' || isSystemAdmin)) {
            openTeamContents = (
                <div className='signup-team-dir-err'>
                    <div>
                        <FormattedMessage
                            id='signup_team.no_open_teams_canCreate'
                            defaultMessage='No teams are available to join. Please create a new team or ask your administrator for an invite.'
                        />
                    </div>
                </div>
            );
        } else if (openTeamContents.length === 0) {
            openTeamContents = (
                <div className='signup-team-dir-err'>
                    <div>
                        <FormattedMessage
                            id='signup_team.no_open_teams'
                            defaultMessage='No teams are available to join. Please ask your administrator for an invite.'
                        />
                    </div>
                </div>
            );
        }

        if (Array.isArray(openTeamContents)) {
            openTeamContents = openTeamContents.sort(this.teamContentsCompare);
        }

        let openContent = (
            <div className='signup__content'>
                <h4>
                    <FormattedMessage
                        id='signup_team.join_open'
                        defaultMessage='Teams you can join: '
                    />
                </h4>
                <div className='signup-team-all'>
                    {openTeamContents}
                </div>
            </div>
        );

        if (!this.state.loaded) {
            openContent = <LoadingScreen/>;
        }

        let teamHelp = null;
        if (isSystemAdmin && (global.window.mm_config.EnableTeamCreation === 'false')) {
            teamHelp = (
                <FormattedMessage
                    id='login.createTeamAdminOnly'
                    defaultMessage='This option is only available for System Administrators, and does not show up for other users.'
                />
            );
        }

        let teamSignUp;
        if (isSystemAdmin || global.window.mm_config.EnableTeamCreation === 'true') {
            teamSignUp = (
                <div className='margin--extra'>
                    <Link
                        to='/create_team'
                        className='signup-team-login'
                    >
                        <FormattedMessage
                            id='login.createTeam'
                            defaultMessage='Create a new team'
                        />
                    </Link>
                    <div>
                        {teamHelp}
                    </div>
                </div>
            );
        }

        let adminConsoleLink;
        if (isSystemAdmin && !UserAgent.isMobileApp()) {
            adminConsoleLink = (
                <div className='margin--extra hidden-xs'>
                    <Link
                        to='/admin_console'
                        className='signup-team-login'
                    >
                        <FormattedMessage
                            id='signup_team_system_console'
                            defaultMessage='Go to System Console'
                        />
                    </Link>
                </div>
            );
        }

        let description = null;
        if (global.window.mm_license.IsLicensed === 'true' && global.window.mm_license.CustomBrand === 'true' && global.window.mm_config.EnableCustomBrand === 'true') {
            description = global.window.mm_config.CustomDescriptionText;
        } else {
            description = (
                <FormattedMessage
                    id='web.root.signup_info'
                    defaultMessage='All team communication in one place, searchable and accessible anywhere'
                />
            );
        }

        let headerButton;
        if (this.state.teamMembers.length) {
            headerButton = (
                <Link to='/'>
                    <span className='fa fa-chevron-left'/>
                    <FormattedMessage id='web.header.back'/>
                </Link>
            );
        } else {
            headerButton = (
                <a
                    href='#'
                    onClick={() => GlobalActions.emitUserLoggedOutEvent()}
                >
                    <span className='fa fa-chevron-left'/>
                    <FormattedMessage id='web.header.logout'/>
                </a>
            );
        }
        return (
            <div>
                <AnnouncementBar/>
                <div className='signup-header'>
                    {headerButton}
                </div>
                <div className='col-sm-12'>
                    <div className={'signup-team__container'}>
                        <img
                            className='signup-team-logo'
                            src={logoImage}
                        />
                        <h1>{global.window.mm_config.SiteName}</h1>
                        <h4 className='color--light'>
                            {description}
                        </h4>
                        {openContent}
                        {teamSignUp}
                        {adminConsoleLink}
                    </div>
                </div>
            </div>
        );
    }
}