import { execa } from 'execa';
import { fileURLToPath } from 'url';
import { dirname, resolve } from 'path';
import { promises, existsSync } from 'fs';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

const createAstroError = new Error(
	'Timed out waiting for create-astro to respond with expected output.'
);
const timeout = 5000;

const instructions = {
	directory: 'Where would you like to create your app?',
	template: 'Which app template would you like to use?',
};
const inputs = {
	nonEmptyDir: './fixtures/select-directory/nonempty-dir',
	emptyDir: './fixtures/select-directory/empty-dir',
	nonexistentDir: './fixtures/select-directory/banana-dir',
};

function promiseWithTimeout(testFn) {
	return new Promise((resolve, reject) => {
		const timeoutEvent = setTimeout(() => {
			reject(createAstroError);
		}, timeout);
		function resolver() {
			clearTimeout(timeoutEvent);
			resolve();
		}
		testFn(resolver);
	});
}

function setup(args = []) {
	const { stdout, stdin } = execa('../create-astro.mjs', args, { cwd: __dirname });
	return {
		stdin,
		stdout,
	};
}

describe('[create-astro] select directory', function () {
	this.timeout(timeout);
	it('should prompt for directory when none is provided', function () {
		return promiseWithTimeout((resolve) => {
			const { stdout } = setup();
			stdout.on('data', (chunk) => {
				if (chunk.includes(instructions.directory)) {
					resolve();
				}
			});
		});
	});
	it('should NOT proceed on a non-empty directory', function () {
		return promiseWithTimeout((resolve) => {
			const { stdout } = setup([inputs.nonEmptyDir]);
			stdout.on('data', (chunk) => {
				if (chunk.includes(instructions.directory)) {
					resolve();
				}
			});
		});
	});
	it('should proceed on an empty directory', async function () {
		const resolvedEmptyDirPath = resolve(__dirname, inputs.emptyDir);
		if (!existsSync(resolvedEmptyDirPath)) {
			await promises.mkdir(resolvedEmptyDirPath);
		}
		return promiseWithTimeout((resolve) => {
			const { stdout } = setup([inputs.emptyDir]);
			stdout.on('data', (chunk) => {
				if (chunk.includes(instructions.template)) {
					resolve();
				}
			});
		});
	});
	it('should proceed when directory does not exist', function () {
		return promiseWithTimeout((resolve) => {
			const { stdout } = setup([inputs.nonexistentDir]);
			stdout.on('data', (chunk) => {
				if (chunk.includes(instructions.template)) {
					resolve();
				}
			});
		});
	});
	it('should error on bad directory selection in prompt', function () {
		return promiseWithTimeout((resolve) => {
			const { stdout, stdin } = setup();
			stdout.on('data', (chunk) => {
				if (chunk.includes('Please clear contents or choose a different path.')) {
					resolve();
				}
				if (chunk.includes(instructions.directory)) {
					stdin.write(`${inputs.nonEmptyDir}\x0D`);
				}
			});
		});
	});
});