// *****************************************************************************
// Copyright (C) 2023 Ericsson and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0.
//
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License v. 2.0 are satisfied: GNU General Public License, version 2
// with the GNU Classpath Exception which is available at
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// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
// *****************************************************************************

/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
// code copied and modified from https://github.com/microsoft/vscode/blob/1.77.0/src/vscode-dts/vscode.proposed.externalUriOpener.d.ts

export module '@theia/plugin' {
    /**
     * Details if an `ExternalUriOpener` can open a uri.
     *
     * The priority is also used to rank multiple openers against each other and determine
     * if an opener should be selected automatically or if the user should be prompted to
     * select an opener.
     *
     * The editor will try to use the best available opener, as sorted by `ExternalUriOpenerPriority`.
     * If there are multiple potential "best" openers for a URI, then the user will be prompted
     * to select an opener.
     */
    export enum ExternalUriOpenerPriority {
        /**
         * The opener is disabled and will never be shown to users.
         *
         * Note that the opener can still be used if the user specifically
         * configures it in their settings.
         */
        None = 0,

        /**
         * The opener can open the uri but will not cause a prompt on its own
         * since the editor always contributes a built-in `Default` opener.
         */
        Option = 1,

        /**
         * The opener can open the uri.
         *
         * The editor's built-in opener has `Default` priority. This means that any additional `Default`
         * openers will cause the user to be prompted to select from a list of all potential openers.
         */
        Default = 2,

        /**
         * The opener can open the uri and should be automatically selected over any
         * default openers, include the built-in one from the editor.
         *
         * A preferred opener will be automatically selected if no other preferred openers
         * are available. If multiple preferred openers are available, then the user
         * is shown a prompt with all potential openers (not just preferred openers).
         */
        Preferred = 3,
    }

    /**
     * Handles opening uris to external resources, such as http(s) links.
     *
     * Extensions can implement an `ExternalUriOpener` to open `http` links to a webserver
     * inside of the editor instead of having the link be opened by the web browser.
     *
     * Currently openers may only be registered for `http` and `https` uris.
     */
    export interface ExternalUriOpener {

        /**
         * Check if the opener can open a uri.
         *
         * @param uri The uri being opened. This is the uri that the user clicked on. It has
         * not yet gone through port forwarding.
         * @param token Cancellation token indicating that the result is no longer needed.
         *
         * @return Priority indicating if the opener can open the external uri.
         */
        canOpenExternalUri(uri: Uri, token: CancellationToken): ExternalUriOpenerPriority | Thenable<ExternalUriOpenerPriority>;

        /**
         * Open a uri.
         *
         * This is invoked when:
         *
         * - The user clicks a link which does not have an assigned opener. In this case, first `canOpenExternalUri`
         *   is called and if the user selects this opener, then `openExternalUri` is called.
         * - The user sets the default opener for a link in their settings and then visits a link.
         *
         * @param resolvedUri The uri to open. This uri may have been transformed by port forwarding, so it
         * may not match the original uri passed to `canOpenExternalUri`. Use `ctx.originalUri` to check the
         * original uri.
         * @param ctx Additional information about the uri being opened.
         * @param token Cancellation token indicating that opening has been canceled.
         *
         * @return Thenable indicating that the opening has completed.
         */
        openExternalUri(resolvedUri: Uri, ctx: OpenExternalUriContext, token: CancellationToken): Thenable<void> | void;
    }

    /**
     * Additional information about the uri being opened.
     */
    export interface OpenExternalUriContext {
        /**
         * The uri that triggered the open.
         *
         * This is the original uri that the user clicked on or that was passed to `openExternal.`
         * Due to port forwarding, this may not match the `resolvedUri` passed to `openExternalUri`.
         */
        readonly sourceUri: Uri;
    }

    /**
     * Additional metadata about a registered `ExternalUriOpener`.
     */
    interface ExternalUriOpenerMetadata {

        /**
         * List of uri schemes the opener is triggered for.
         *
         * Currently only `http` and `https` are supported.
         */
        readonly schemes: readonly string[];

        /**
         * Text displayed to the user that explains what the opener does.
         *
         * For example, 'Open in browser preview'
         */
        readonly label: string;
    }

    export namespace window {
        /**
         * Register a new `ExternalUriOpener`.
         *
         * When a uri is about to be opened, an `onOpenExternalUri:SCHEME` activation event is fired.
         *
         * @param id Unique id of the opener, such as `myExtension.browserPreview`. This is used in settings
         *   and commands to identify the opener.
         * @param opener Opener to register.
         * @param metadata Additional information about the opener.
         *
         * @returns Disposable that unregisters the opener.
         */
        export function registerExternalUriOpener(id: string, opener: ExternalUriOpener, metadata: ExternalUriOpenerMetadata): Disposable;
    }
}
