export function executeWslPath(pathToConvert: string, toLinux: boolean, distro: string): string {
	if (toLinux) {
		let commandLine = 'echo "$VSCODE_WSL_PATH"';
		const options = {
			'WSLENV': 'VSCODE_WSL_PATH/up',
			'VSCODE_WSL_PATH': pathToConvert
		};
		return executeCommand(commandLine, options, distro).trim();
	} else {
		let commandLine = `wslpath -w "$VSCODE_WSL_PATH"`;
		const options = {
			'WSLENV': 'VSCODE_WSL_PATH/u',
			'VSCODE_WSL_PATH': pathToConvert
		};
		return executeCommand(commandLine, options, distro).trim();
	}
}

export function executeCommand(commandLine: string, env: Record<string, string>, distro: string): string {
	const wslExecPath = getWSLExecutablePath();
	if (!wslExecPath) {
		throw new Error(localize('executeCommand.noWSL', 'wsl command not found\n\nMake sure WSL is installed:\nhttps://aka.ms/vscode-remote/wsl/install-wsl'));
	}
	const options = getExecSyncOptions(env);
	let args = [];
	if (isExecAndDistroArgumentSupported()) {
		args.push('-d', distro, '-e', 'sh', '-c', commandLine);
	} else if (path.basename(wslExecPath).toLowerCase() === 'wsl.exe') {
		args.push('sh', '-c', commandLine);
	} else {
		args.push('-c', commandLine);
	}
	return cp.execFileSync(wslExecPath, args, options as cp.ExecFileSyncOptions).toString();
}

export function getWSLExecutablePath(): string | undefined {
	let useWSLexe = getWindowsBuildNumber() >= 16299;
	const is32ProcessOn64Windows = process.env.hasOwnProperty('PROCESSOR_ARCHITEW6432');
	const systemRoot = process.env['SystemRoot'];
	if (systemRoot) {
		return path.join(systemRoot, is32ProcessOn64Windows ? 'Sysnative' : 'System32', useWSLexe ? 'wsl.exe' : 'bash.exe');
	}
	return undefined;
}

export function isExecAndDistroArgumentSupported(): boolean {
	// https://docs.microsoft.com/en-us/windows/wsl/release-notes#build-17666
	return getWindowsBuildNumber() >= 17666; // part of September 2018 Update (1809)
}

export function getExecSyncOptions(env: Record<string, string> = {}): cp.ExecSyncOptions & { env: NodeJS.ProcessEnv; stdio: cp.StdioOptions } {
	return { env, stdio: [null, null, null] };
}