import { SemVer } from 'semver';

import { getGlobalVariable } from '../../utils/env';

import { readFile, writeFile } from '../../utils/fs';

import { ng } from '../../utils/process';

import { expectToFail } from '../../utils/utils';

export default async function () {

if (getGlobalVariable('argv')['ng-snapshots']) {

// The snapshots job won't work correctly because it doesn't use semver for Angular.

return;

}

const angularCliPkgJson = JSON.parse(await readFile('node_modules/@angular/cli/package.json'));

const cliMajor = new SemVer(angularCliPkgJson.version as string).major;

const angularCorePkgPath = 'node_modules/@angular/core/package.json';

const originalAngularCorePkgJson = await readFile(angularCorePkgPath);

// Fake version by writing over the @angular/core version, since that's what the CLI checks.

const fakeCoreVersion = async (newMajor: number) => {

const tmpPkgJson = JSON.parse(originalAngularCorePkgJson);

tmpPkgJson.version = `${newMajor}.0.0`;

await writeFile(angularCorePkgPath, JSON.stringify(tmpPkgJson));

};

// Major should succeed, but we don't need to test it here since it's tested everywhere else.

// Major+1 and -1 should fail architect commands, but allow other commands.

try {

await fakeCoreVersion(cliMajor + 1);

await expectToFail(() => ng('build'), 'Should fail Major+1');

await ng('version');

await fakeCoreVersion(cliMajor - 1);

await ng('version');

} finally {

// Restore the original core package.json.

await writeFile(angularCorePkgPath, originalAngularCorePkgJson);

}

}