package ch.claude_martin.foo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

public class SomeClass {

	public static void main(String[] args) throws InterruptedException {
		try {
			// The old CMD on Windows uses UTF-16:
			var utf16 = Charset.forName("UTF-16LE");
			System.out.println(execute("cmd /U /C echo hello", utf16));
			
			// Linux usually has UTF-8 as the default encoding:
			var utf8 = Charset.forName("UTF-8");
			// using WSL we can easily access the Linux subsystem:
			System.out.println(execute("wsl echo hello", utf8));
			// You get a List. Use .get(0) to get the first line:
			System.out.println(execute("wsl uname -a", utf8).get(0));
			// This only works when Windows is installed on C:\
			System.out.println(execute("wsl ls /mnt/c/Users", utf8)); 
			// But you can combine CMD and WSL to make sure you get the correct paths:
			var home = execute("cmd /U /C echo %USERPROFILE%", utf16).get(0);
			System.out.println(execute(String.format("wsl wslpath '%s'", home), utf8)); 
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * Run given command and return the data read from stdout.
	 * 
	 * @param cmd the command, for example "cmd /U /C echo foo"
	 * @return The output of the command as a List of Strings.
	 * @throws IOException Thrown when executing the command or reading the data
	 *                     fails.
	 */
	public static List<String> execute(final String cmd, Charset encoding) throws IOException {
		Process p = null;
		try {
			p = Runtime.getRuntime().exec(cmd);
			try (var br = new BufferedReader(new InputStreamReader(p.getInputStream(), encoding))) {
				List<String> result = new ArrayList<>();
				for (;;) {
					String line = br.readLine();
					if (line == null)
						break;
					result.add(line);
				}
				return result;
			}
		} finally {
			if (p != null)
				p.destroy();
		}
	}
}