#include <fstream>
#include <ctime>
#include "command.h"
using std::fstream;


void ExitCommand::execute(list<int> & my_list) {
   // Nothing to do!
}

void InvalidCommand::execute(list<int> & my_list) {
   cout << '\t' << "invalid command" << endl;
}

void LoadNumbersCommand::execute(list<int> & my_list) {
   commandStack.push(my_list);
   my_list.erase(my_list.begin(), my_list.end());
   fstream input;
   input.open("data", ios::in);
   int number;
   input >> number;
   while(!input.eof()) {
     my_list.push_back(number);
     input >> number;
   }
   input.close();
}

void SaveNumbersCommand::execute(list<int> & my_list) {
   fstream output;
   output.open("data", ios::out);
   list<int>::const_iterator ptr = my_list.begin();
   while(ptr != my_list.end()) {
     output << *ptr << endl;
     ++ptr;
   }
   output.close();
}

void GiveHelpCommand::execute(list<int> & my_list) {
}

void UndoCommand::execute(list<int> & my_list) {
	if ( commandStack.empty() ) return;
   my_list = commandStack.top();
   commandStack.pop();
}

void GetNumberCommand::execute(list<int> & my_list) {
   commandStack.push(my_list);
   srand( time(0) );
   my_list.push_back(rand() % 100);
}

void PutNumbersCommand::execute(list<int> & my_list) {
   list<int>::const_iterator ptr = my_list.begin();
   cout << "The list contains: " << endl;
   while ( ptr != my_list.end() ) {
      cout << *ptr << '\t';
      ++ptr;
   }
   cout << endl;
}

void SortNumbersCommand::execute(list<int> & my_list) {
   commandStack.push(my_list);
   my_list.sort();
}