/**
 *  
 *  Is a virtual machine for parsing. It has some ideas
 *  drawn from the sed tool.
 *
 *  @author http://bumble.sf.net
 */
// good examples
// http://www.josuttis.com/libbook/i18n/loc1.cpp.html

#include <iostream>
#include <fstream>
#include <vector>
#include <stack>
#include <string>
#include <sstream>
#include <ctype.h>
#include "Program.h" 

using namespace std;
 


  //--------------------------------------------
  /** provides a command loop to test the Instruction class */
  int main(int argc, char* argv[]) 
  {
    
    string sUsageMessage("");
    sUsageMessage.append("usage: Program file");
    sUsageMessage.append("\n");
    ifstream in;
    string sMessage("");

    if (argc != 2) {
       cout << sUsageMessage;
       exit(-1);
    }
    else
    {
      in.open(argv[1]);
      if (!in.is_open())
      {
        cout << "couldnt open file " << argv[1] << endl;
      }
    } //-- if
 

    Program testProgram;

     string sCommand("");
     string sUserMessage("");

     sUserMessage.append("Commands;");
     sUserMessage.append("\n");
     sUserMessage.append(" a - add an instruction");
     sUserMessage.append("\n");
     sUserMessage.append(" x - execute the current instruction [exe]");
     sUserMessage.append("\n");
     sUserMessage.append(" r - run the program [run]");
     sUserMessage.append("\n");
     sUserMessage.append(" s - reset instruction pointer to 0 [reset]");
     sUserMessage.append("\n");
     sUserMessage.append(" p - display everything [print]");
     sUserMessage.append("\n");
     sUserMessage.append(" l - print a program listing [list]");
     sUserMessage.append("\n");
     sUserMessage.append(" m - show the state of the machine [machine]");
     sUserMessage.append("\n");
     sUserMessage.append(" c - display the current instruction");
     sUserMessage.append("\n");
     sUserMessage.append(" h - help, show this message [?]");
     sUserMessage.append("\n");
     sUserMessage.append(" q - quit");
     sUserMessage.append("\n");
     cout << sUserMessage;

     //----------------------------------
     //-- the command loop
     //--
     sCommand = " ";
     cout << sCommand;
     while (sCommand != "q")
     {
       //cout << "last command [" << sCommand << "]" << endl;

       //--------------------------------
       if ((sCommand == "p") || (sCommand == "print"))
       {
         cout << testProgram.toString();
       }

       //--------------------------------
       if ((sCommand == "l") || (sCommand == "list"))
       {
         cout << testProgram.listing();
       }

       //--------------------------------
       if ((sCommand == "m") || (sCommand == "machine"))
       {
         cout << testProgram.showMachine();
       }

       //--------------------------------
       if ((sCommand == "c"))
       {
         cout << "current instruction:" << testProgram.showNext() << endl;
       }

       //--------------------------------
       if ((sCommand == "x") || (sCommand == "exe"))
       {
         testProgram.execute(in);
       }

       //--------------------------------
       if ((sCommand == "r") || (sCommand == "run"))
       {
         testProgram.run(in);
       }

       //--------------------------------
       if ((sCommand == "s") || (sCommand == "reset"))
       {
         testProgram.reset();
       }

       //--------------------------------
       if (sCommand.at(0) == 'a')
       {
         if (sCommand.length() == 1)
         {
           cout << "The 'a' command requires an argument: \n" 
                << "eg aBig adds the string big as parameter" << endl;
         }
         else
         { 
           int iFirstComma = sCommand.find(",");
           if (iFirstComma != string::npos)
           {
             string sParameter1 = sCommand.substr(1, iFirstComma - 1);
             string sParameter2 = sCommand.substr(iFirstComma + 1);
             cout << "p1:" << sParameter1 << "\n"
                  << "p2:" << sParameter2 << "\n";

             int iSecondComma = sParameter2.find(",");
             if (iSecondComma != string::npos)
             {
                string sParameter3 = sParameter2.substr(iSecondComma + 1);
                sParameter2 = sParameter2.substr(0, iSecondComma);
                cout << "p1:" << sParameter1 << "\n"
                     << "p2:" << sParameter2 << "\n"
                     << "p3:" << sParameter3 << "\n";
               testProgram.addInstruction(sParameter1, sParameter2, sParameter3);
             }
             else
             { 
               testProgram.addInstruction(sParameter1, sParameter2);
             }  
           }
           else 
           {
           testProgram.addInstruction(sCommand.substr(1)); 
           }
         }
       }


       //--------------------------------
       // 
       if ((sCommand == "?") || (sCommand == "h"))
       {
         cout << sUserMessage;               
       }


       //cout << testProgram.print();
       cout << ">";
       sCommand.clear();
       getline(cin, sCommand);
     } //-- while


    cout << testProgram.print();
    

  } //-- main()