import React, { Component } from 'react';
import { connect } from 'react-redux';

import { translate } from '../../base/i18n';
import { shouldRemoteVideosBeVisible } from '../../filmstrip';

/**
 * Implements a React {@link Component} which displays the current state of
 * conference recording. Currently it uses CSS to display itself automatically
 * when there is a recording state update.
 *
 * @extends {Component}
 */
class RecordingLabel extends Component {
    /**
     * {@code RecordingLabel} component's property types.
     *
     * @static
     */
    static propTypes = {
        /**
         * Whether or not the filmstrip is currently visible or toggled to
         * hidden. Depending on the filmstrip state, different CSS classes will
         * be set to allow for adjusting of {@code RecordingLabel} positioning.
         */
        _filmstripVisible: React.PropTypes.bool,

        /**
         * An object to describe the {@code RecordingLabel} content. If no
         * translation key to display is specified, the label will apply CSS to
         * itself so it can be made invisible.
         * {{
         *     centered: boolean,
         *     key: string,
         *     showSpinner: boolean
         * }}
         */
        _labelDisplayConfiguration: React.PropTypes.object,

        /**
         * Whether or not remote videos within the filmstrip are currently
         * visible. Depending on the visibility state, coupled with filmstrip
         * visibility, CSS classes will be set to allow for adjusting of
         * {@code RecordingLabel} positioning.
         */
        _remoteVideosVisible: React.PropTypes.bool,

        /**
         * Invoked to obtain translated string.
         */
        t: React.PropTypes.func
    };

    /**
     * Initializes a new {@code RecordingLabel} instance.
     *
     * @param {Object} props - The read-only properties with which the new
     * instance is to be initialized.
     */
    constructor(props) {
        super(props);

        this.state = {
            /**
             * Whether or not the filmstrip was not visible but has transitioned
             * in the latest component update to visible. This boolean is used
             * to set a class for position animations.
             *
             * @type {boolean}
             */
            filmstripBecomingVisible: false
        };
    }

    /**
     * Updates the state for whether or not the filmstrip is being toggled to
     * display after having being hidden.
     *
     * @inheritdoc
     * @param {Object} nextProps - The read-only props which this Component will
     * receive.
     * @returns {void}
     */
    componentWillReceiveProps(nextProps) {
        this.setState({
            filmstripBecomingVisible: nextProps._filmstripVisible
                && !this.props._filmstripVisible
        });
    }

    /**
     * Implements React's {@link Component#render()}.
     *
     * @inheritdoc
     * @returns {ReactElement}
     */
    render() {
        const { _labelDisplayConfiguration } = this.props;
        const { centered, key, showSpinner } = _labelDisplayConfiguration || {};

        const isVisible = Boolean(key);
        const rootClassName = [
            'video-state-indicator centeredVideoLabel',
            isVisible ? 'show-inline' : '',
            centered ? '' : 'moveToCorner',
            this.state.filmstripBecomingVisible ? 'opening' : '',
            this.props._filmstripVisible
                ? 'with-filmstrip' : 'without-filmstrip',
            this.props._remoteVideosVisible
                ? 'with-remote-videos' : 'without-remote-videos'
        ].join(' ');

        return (
            <span
                className = { rootClassName }
                id = 'recordingLabel'>
                <span id = 'recordingLabelText'>
                    { this.props.t(key) }
                </span>
                { showSpinner
                    ? <img
                        className = 'recordingSpinner'
                        id = 'recordingSpinner'
                        src = 'images/spin.svg' />
                    : null }
            </span>
        );
    }
}

/**
 * Maps (parts of) the Redux state to the associated {@code RecordingLabel}
 * component's props.
 *
 * @param {Object} state - The Redux state.
 * @private
 * @returns {{
 *     _filmstripVisible: boolean,
 *     _labelDisplayConfiguration: Object,
 *     _remoteVideosVisible: boolean,
 * }}
 */
function _mapStateToProps(state) {
    const { visible } = state['features/filmstrip'];
    const { labelDisplayConfiguration } = state['features/recording'];

    return {
        /**
         * Whether or not the filmstrip is currently set to be displayed.
         *
         * @type {boolean}
         */
        _filmstripVisible: visible,

        /**
         * An object describing how {@code RecordingLabel} should display its
         * contents.
         *
         * @type {Object}
         */
        _labelDisplayConfiguration: labelDisplayConfiguration,

        /**
         * Whether or not remote videos are displayed in the filmstrip.
         *
         * @type {boolean}
         */
        _remoteVideosVisible: shouldRemoteVideosBeVisible(state)
    };
}

export default translate(connect(_mapStateToProps)(RecordingLabel));