/**
 * 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 { injectable } from "inversify";

@injectable()
export abstract class AbstractComponentEnv {
}

export function getEnvVar(name: string, defaultValue?: string): string {
    const value = process.env[name] || defaultValue;
    if (!value) {
        throw new Error(`Environment variable undefined or empty: ${name}`);
    }
    return value;
}

export function filePathTelepresenceAware(filePath: string): string {
    if (filePath && process.env.TELEPRESENCE_ROOT) {
        filePath = process.env.TELEPRESENCE_ROOT + filePath;
    }
    return filePath;
}

export function getEnvVarParsed<T>(name: string, parser: (value: string) => T, defaultValue?: string): T {
    return parser(getEnvVar(name, defaultValue));
}