/**
 * Copyright (c) 2020 Gitpod GmbH. All rights reserved.
 * Licensed under the GNU Affero General Public License (AGPL).
 * See License.AGPL.txt in the project root for license information.
 */

import { Event } from "./util/event";
import { Disposable } from "./util/disposable";

export type IDEFrontendState = "init" | "ready" | "terminated";

export interface IDEFrontendService {
    readonly state: IDEFrontendState;
    /**
     * A cause of the ide frontend application failure when state is terminated.
     */
    readonly failureCause?: Error;
    readonly onDidChange: Event<void>;
    /**
     * Starts the ide frontend application.
     * Returns the disposable object which is triggered when the ide application should be stopped.
     *
     * On stop the application should store the unsaved changes.
     * It won't receive any `beforeunload` events from window anymore to prevent
     * confirmation dialogs for stopped workspaces.
     */
    start(): Disposable;
}