import JitsiMeetJS from '../lib-jitsi-meet';

import {
    SET_AUDIO_INPUT_DEVICE,
    SET_VIDEO_INPUT_DEVICE,
    UPDATE_DEVICE_LIST
} from './actionTypes';

/**
 * Queries for connected A/V input and output devices and updates the redux
 * state of known devices.
 *
 * @returns {Function}
 */
export function getAvailableDevices() {
    return dispatch => new Promise(resolve => {
        const { mediaDevices } = JitsiMeetJS;

        if (mediaDevices.isDeviceListAvailable()
                && mediaDevices.isDeviceChangeAvailable()) {
            mediaDevices.enumerateDevices(devices => {
                dispatch(updateDeviceList(devices));

                resolve(devices);
            });
        } else {
            resolve([]);
        }
    });
}

/**
 * Signals to update the currently used audio input device.
 *
 * @param {string} deviceId - The id of the new audio input device.
 * @returns {{
 *      type: SET_AUDIO_INPUT_DEVICE,
 *      deviceId: string
 * }}
 */
export function setAudioInputDevice(deviceId) {
    return {
        type: SET_AUDIO_INPUT_DEVICE,
        deviceId
    };
}

/**
 * Signals to update the currently used video input device.
 *
 * @param {string} deviceId - The id of the new video input device.
 * @returns {{
 *      type: SET_VIDEO_INPUT_DEVICE,
 *      deviceId: string
 * }}
 */
export function setVideoInputDevice(deviceId) {
    return {
        type: SET_VIDEO_INPUT_DEVICE,
        deviceId
    };
}

/**
 * Signals to update the list of known audio and video devices.
 *
 * @param {Array<MediaDeviceInfo>} devices - All known available audio input,
 * audio output, and video input devices.
 * @returns {{
 *      type: UPDATE_DEVICE_LIST,
 *      devices: Array<MediaDeviceInfo>
 * }}
 */
export function updateDeviceList(devices) {
    return {
        type: UPDATE_DEVICE_LIST,
        devices
    };
}