// @flow

import { getToolbarButtons } from '../base/config';
import { hasAvailableDevices } from '../base/devices';

const WIDTH = {
    MEDIUM: 500,
    SMALL: 390,
    VERY_SMALL: 332,
    NARROW: 224
};

/**
 * Returns a set of button names to be displayed in the toolbox, based on the screen width.
 *
 * @param {number} width - The width of the screen.
 * @returns {Set} The button set.
 */
export function getToolbarAdditionalButtons(width: number): Set<string> {
    if (width <= WIDTH.MEDIUM) {
        if (width <= WIDTH.SMALL) {
            if (width <= WIDTH.VERY_SMALL) {
                if (width <= WIDTH.NARROW) {
                    return new Set();
                }

                return new Set([ 'overflow' ]);
            }

            return new Set([ 'chat', 'tileview', 'overflow' ]);
        }

        return new Set([ 'chat', 'raisehand', 'tileview', 'overflow' ]);
    }

    return new Set([ 'desktop', 'chat', 'raisehand', 'tileview', 'invite', 'overflow' ]);
}

/**
 * Helper for getting the height of the toolbox.
 *
 * @returns {number} The height of the toolbox.
 */
export function getToolboxHeight() {
    const toolbox = document.getElementById('new-toolbox');

    return (toolbox && toolbox.clientHeight) || 0;
}

/**
 * Indicates if a toolbar button is enabled.
 *
 * @param {string} name - The name of the setting section as defined in
 * interface_config.js.
 * @param {Object} state - The redux state.
 * @returns {boolean|undefined} - True to indicate that the given toolbar button
 * is enabled, false - otherwise.
 */
export function isButtonEnabled(name: string, state: Object) {
    const toolbarButtons = getToolbarButtons(state);

    return toolbarButtons.indexOf(name) !== -1;
}

/**
 * Indicates if the toolbox is visible or not.
 *
 * @param {string} state - The state from the Redux store.
 * @returns {boolean} - True to indicate that the toolbox is visible, false -
 * otherwise.
 */
export function isToolboxVisible(state: Object) {
    const { iAmSipGateway } = state['features/base/config'];
    const {
        alwaysVisible,
        timeoutID,
        visible
    } = state['features/toolbox'];
    const { audioSettingsVisible, videoSettingsVisible } = state['features/settings'];

    return Boolean(!iAmSipGateway && (timeoutID || visible || alwaysVisible
                                      || audioSettingsVisible || videoSettingsVisible));
}

/**
 * Indicates if the audio settings button is disabled or not.
 *
 * @param {string} state - The state from the Redux store.
 * @returns {boolean}
 */
export function isAudioSettingsButtonDisabled(state: Object) {
    return (!hasAvailableDevices(state, 'audioInput')
          && !hasAvailableDevices(state, 'audioOutput'))
          || state['features/base/config'].startSilent;
}

/**
 * Indicates if the video settings button is disabled or not.
 *
 * @param {string} state - The state from the Redux store.
 * @returns {boolean}
 */
export function isVideoSettingsButtonDisabled(state: Object) {
    return !hasAvailableDevices(state, 'videoInput');
}

/**
 * Indicates if the video mute button is disabled or not.
 *
 * @param {string} state - The state from the Redux store.
 * @returns {boolean}
 */
export function isVideoMuteButtonDisabled(state: Object) {
    return !hasAvailableDevices(state, 'videoInput');
}