// *****************************************************************************
// Copyright (C) 2021 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
// 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 * as chai from 'chai';
import { EnvironmentUtils } from './environment-utils';

const expect = chai.expect;

describe('EnvironmentUtils', function (): void {

    describe('#mergeProcessEnv', function (): void {
        this.timeout(5000);

        let utils: EnvironmentUtils;

        const PATH = 'PATH';

        beforeEach(function (): void {
            utils = new EnvironmentUtils();
        });

        it('should validate the presence of a known process variable', function (): void {
            const mergedEnv = utils.mergeProcessEnv({});
            expect(mergedEnv[PATH]).length.greaterThan(0);
        });

        for (const platform of ['linux', 'darwin'] as NodeJS.Platform[]) {
            it(`should conserve case for keys on "${platform}"`, function (): void {
                utils['getPlatform'] = () => platform;
                process.env['TestKey'] = 'test_value';
                const mergedEnv = utils.mergeProcessEnv({});
                expect(mergedEnv['TestKey']).equal('test_value');
                expect(mergedEnv['TESTKEY']).equal(undefined);
            });
        }

        it('should uppercase keys on "win32"', function (): void {
            utils['getPlatform'] = () => 'win32';
            process.env['TestKey'] = 'test_value';
            const mergedEnv = utils.mergeProcessEnv({});
            expect(mergedEnv['TestKey']).equal(undefined);
            expect(mergedEnv['TESTKEY']).equal('test_value');
        });

        it('should be possible to remove a known process variable', function (): void {
            // eslint-disable-next-line no-null/no-null
            const customizedEnv = { [PATH]: null };
            const mergedEnv = utils.mergeProcessEnv(customizedEnv);
            expect(mergedEnv[PATH]).equal(undefined);
        });

        it('should be possible to override the value of a known process variable', function (): void {
            const expectedValue = '/path/to/one';
            const customizedEnv = { [PATH]: expectedValue };

            const mergedEnv = utils.mergeProcessEnv(customizedEnv);
            expect(mergedEnv[PATH]).equals(expectedValue);
        });

        it('should not produce a different result when merging a previous result', function (): void {
            const variableName = 'NEW_VARIABLE';
            const expectedValue = 'true';
            const customizedEnv = { [variableName]: expectedValue };

            const mergedEnv = utils.mergeProcessEnv(customizedEnv);
            expect(mergedEnv[variableName]).equals(expectedValue);
        });

        it('should not produce a different result when performing multiple merges', function (): void {
            const variableName = 'NEW_VARIABLE';
            const expectedValue = 'true';
            const customizedEnv = { [variableName]: expectedValue };

            const mergedEnv = utils.mergeProcessEnv(customizedEnv);
            const mergedSecondPass = utils.mergeProcessEnv(mergedEnv);
            expect(mergedEnv).to.deep.equal(mergedSecondPass);
        });
    });
});