#include <stdio.h>

#include <iostream>

#include <list>

#include <cstring>

#include <string>

#include <thread>

using namespace std;


void initialize() {
  int MAX_LENGTH = 100;
  bool isExecuted = false;

  char commandStr[MAX_LENGTH];
  list <string> commandsArray {
    "dir",
    "ls",
    "help",
    "vol",
    "path",
    "tasklist",
    "notepad",
    "echo",
    "color",
    "ping",
  };

  // new line indicator
  cout << "\n⇒ ";

  // get input from user
  fgets(commandStr, MAX_LENGTH, stdin);

  // Stores a copy of original string
  string inputString = commandStr;

  // splits strings
  char *argsTok = strtok(commandStr, " ");

  while (argsTok != NULL) {

    // make sure it's not running
    if (!isExecuted) {

        // find command in command list
      for (list<string>::iterator i = commandsArray.begin(); i != commandsArray.end(); i++) {
        if ( *argsTok == *i-> c_str()) {
            // can execute

          // create new thread and run command
          thread CreateThread {[&](){
            system(inputString.c_str());
            isExecuted = true;

            initialize();
          }};

          // wait for thread
                    CreateThread.join();

                    // stop searching if executed
          break;
        }
      }
    }

    argsTok = strtok(NULL, " ");
  }

  // if user types invalid command
    if(!isExecuted) {
    cout << "Unsupported command " << inputString.c_str() << "\n";
    initialize();
  }

}

int main() {

    cout << "Welcome to myShell\n";

  initialize();

  return (0);
}