import { connect } from 'react-redux';

import { createToolbarEvent } from '../../analytics/AnalyticsEvents';
import { sendAnalytics } from '../../analytics/functions';
import { IReduxState } from '../../app/types';
import { HELP_BUTTON_ENABLED } from '../../base/flags/constants';
import { getFeatureFlag } from '../../base/flags/functions';
import { translate } from '../../base/i18n/functions';
import { IconHelp } from '../../base/icons/svg';
import AbstractButton, { IProps as AbstractButtonProps } from '../../base/toolbox/components/AbstractButton';
import { openURLInBrowser } from '../../base/util/openURLInBrowser';

interface IProps extends AbstractButtonProps {

    /**
     * The URL to the user documentation.
     */
    _userDocumentationURL: string;
}

/**
 * Implements an {@link AbstractButton} to open the user documentation in a new window.
 */
class HelpButton extends AbstractButton<IProps> {
    accessibilityLabel = 'toolbar.accessibilityLabel.help';
    icon = IconHelp;
    label = 'toolbar.help';
    tooltip = 'toolbar.help';

    /**
     * Handles clicking / pressing the button, and opens a new window with the user documentation.
     *
     * @private
     * @returns {void}
     */
    _handleClick() {
        const { _userDocumentationURL } = this.props;

        sendAnalytics(createToolbarEvent('help.pressed'));
        openURLInBrowser(_userDocumentationURL);
    }
}


/**
 * Maps part of the redux state to the component's props.
 *
 * @param {Object} state - The redux store/state.
 * @returns {Object}
 */
function _mapStateToProps(state: IReduxState) {
    const { userDocumentationURL } = state['features/base/config'].deploymentUrls || {};
    const enabled = getFeatureFlag(state, HELP_BUTTON_ENABLED, true);
    const visible = typeof userDocumentationURL === 'string' && enabled;

    return {
        _userDocumentationURL: userDocumentationURL ?? '',
        visible
    };
}

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