import * as ChildProcess from "child_process";
import * as fs from "fs";

export function spawnTerminalEmulator(preferedEmulator: string): Thenable<string> {
	return new Promise((resolve, reject) => {
		const ttyFileOutput = "/tmp/vscode-gdb-tty-0" + Math.floor(Math.random() * 100000000).toString(36);
		ChildProcess.spawn(preferedEmulator || "x-terminal-emulator", ["-e", "sh -c \"tty > " + ttyFileOutput + " && sleep 4294967294\""]);
		let it = 0;
		const interval = setInterval(() => {
			if (fs.existsSync(ttyFileOutput)) {
				clearInterval(interval);
				const tty = fs.readFileSync(ttyFileOutput).toString("utf8");
				fs.unlinkSync(ttyFileOutput);
				return resolve(tty);
			}
			it++;
			if (it > 500)
				reject();
		}, 10);
	});
}