/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the Source EULA. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
const fs = require('fs').promises;
const path = require('path');

interface IntegrationTestConfig {
	[key: string]: string[];
}

const readConfiguration = (async (): Promise<IntegrationTestConfig | void> => {
	const parseConfigString = ((content: string): (IntegrationTestConfig | void) => {
		try {
			const result = JSON.parse(content);
			return result as IntegrationTestConfig;
		} catch (ex) {
			console.log('Could NOT parse TEST_RUN_LIST:', content);
		}
	});

	// Attempt to read from an enviornment variable
	const testRunlist = process.env['TEST_RUN_LIST'];
	if (testRunlist && testRunlist !== '') {
		const result = parseConfigString(testRunlist);
		if (result) {
			console.log('Using the environment test run list:', result);
			return result;
		}
	}

	// Attempt to read from a config file
	let testRunPath = process.env['TEST_RUN_LIST_FILE'];
	if (!testRunPath || testRunPath === '') {
		testRunPath = path.resolve(__dirname, '..', 'runlist.json');
	}

	try {
		const contents = await fs.readFile(testRunPath);
		return parseConfigString(contents);
	} catch (ex) {
		console.log(`error reading file ${testRunPath}:`, ex);
	}
});

(async (): Promise<string | void> => {
	const keys = process.argv.slice(2);

	const configuration = await readConfiguration();

	if (!configuration) {
		console.log('no configuration was setup');
		return;
	}

	const testList: string[] = [];
	keys.forEach((key) => {
		const arr = configuration[key];
		if (arr) {
			testList.push(...arr);
		}
	});

	const result = `(${testList.join('|')})`;
	console.log(result);
	process.env['TEST_GREP'] = result;
})();