import type { Dispatch } from 'redux';

import JitsiMeetJS from './_';
import {
    LIB_DID_DISPOSE,
    LIB_DID_INIT,
    LIB_INIT_ERROR,
    LIB_WILL_DISPOSE,
    LIB_WILL_INIT,
    SET_CONFIG
} from './actionTypes';

declare var APP: Object;

/**
 * Disposes (of) lib-jitsi-meet.
 *
 * @returns {Function}
 */
export function disposeLib() {
    return (dispatch: Dispatch<*>) => {
        dispatch({ type: LIB_WILL_DISPOSE });

        // XXX We're wrapping it with Promise because:
        // a) to be better aligned with initLib() method which is async;
        // b) as currently there is no implementation for it in lib-jitsi-meet
        //    and there is a big chance it will be async.
        // TODO Currently, lib-jitsi-meet doesn't have the functionality to
        // dispose itself.
        return (
            Promise.resolve()
                .then(() => dispatch({ type: LIB_DID_DISPOSE })));
    };
}

/**
 * Initializes lib-jitsi-meet (i.e. {@link invokes JitsiMeetJS.init()}) with the
 * current config(uration).
 *
 * @returns {Function}
 */
export function initLib() {
    return (dispatch: Dispatch<*>, getState: Function) => {
        const { config } = getState()['features/base/lib-jitsi-meet'];

        if (!config) {
            throw new Error('Cannot init lib-jitsi-meet without config');
        }

        // XXX Temporarily until conference.js is moved to the React app we
        // shouldn't use JitsiMeetJS from the React app.
        if (typeof APP !== 'undefined') {
            return Promise.resolve();
        }

        dispatch({ type: LIB_WILL_INIT });

        return (
            JitsiMeetJS.init(config)
                .then(() => dispatch({ type: LIB_DID_INIT }))
                .catch(error => {
                    dispatch(libInitError(error));

                    // TODO Handle LIB_INIT_ERROR error somewhere instead.
                    console.error('lib-jitsi-meet failed to init:', error);
                    throw error;
                }));
    };
}

/**
 * Notifies about a specific error raised by {@link JitsiMeetJS.init()}.
 *
 * @param {Error} error - The Error raised by JitsiMeetJS.init().
 * @returns {{
 *     type: LIB_INIT_ERROR,
 *     error: Error
 * }}
 */
export function libInitError(error: Error) {
    return {
        type: LIB_INIT_ERROR,
        error
    };
}

/**
 * Sets config.
 *
 * @param {Object} config - The config(uration) object in the format accepted by
 * the JitsiMeetJS.init() method.
 * @returns {{
 *     type: SET_CONFIG,
 *     config: Object
 * }}
 */
export function setConfig(config: Object) {
    return {
        type: SET_CONFIG,
        config
    };
}