// *****************************************************************************
// Copyright (C) 2018 TypeFox 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
// https://www.gnu.org/software/classpath/license.html.
//
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0
// *****************************************************************************

import { injectable, inject } from '@theia/core/shared/inversify';
import URI from '@theia/core/lib/common/uri';
import { MiniBrowserEnvironment } from '@theia/mini-browser/lib/browser/environment/mini-browser-environment';

@injectable()
export class PreviewLinkNormalizer {

    protected urlScheme = new RegExp('^[a-z][a-z|0-9|\+|\-|\.]*:', 'i');

    @inject(MiniBrowserEnvironment)
    protected readonly miniBrowserEnvironment: MiniBrowserEnvironment;

    normalizeLink(documentUri: URI, link: string): string {
        try {
            if (!this.urlScheme.test(link)) {
                const location = documentUri.parent.resolve(link).path.toString();
                return this.miniBrowserEnvironment.getEndpoint('normalized-link').getRestUrl().resolve(location).toString();
            }
        } catch {
            // ignore
        }
        return link;
    }
}