#include <iostream>
#include <cstring>
#include <fstream>
#include <string>
using namespace std;

/* version */
const char* versinfo = "0.0.3";

void readmsg(char *x);
void show_version(void);
void show_help(void);
void show_wenda(void);

int main (int argc, char **argv) 
{
	if (!argv[1]) 
	{
	cout << "Standard program - Just display list of message titles, numbered." << endl;
	exit(0);
	}
	else
	{
		/* check for non-standard arguments */ 
		if (!strcmp(argv[1], "--version"))
		{
		show_version();
		exit(0);
		}
		else if (!strcmp(argv[1], "--help"))
		{
		show_help();
		exit(0);
		}
		/* this is a cookie - it refers to Wenda from "Where's Wally" */
		else if (!strcmp(argv[1], "--wenda"))
		{
		show_wenda();
		exit(0);
		}
	}

	/* normal argument handler - thanks to Arvind */
	for (int i = 1; i < argc; i++) 
	{    
       		if (argv[i][0] == '-')
		{        
			switch (argv[i][1]) 
			{

			/* bring on the cases */      

                	case 'r':

                   	if (argc > i + 1) {
			char * msg;
			msg = argv[i + 1];
                        readmsg(msg);
                        i++;
                    	}
	                else 	
			{
			cout << "Display list of message titles." << endl;
			}

       			break;


               		case 'w':

			cout << "Write message.";

                    	break;


			case 'y':

			/* useless case here */ show_version();

	                break;


	                default:
			cout << "Unknown argument: " << argv[i][1] << endl;
               		break;
			}
	        }
       		else 
		{
       		cout << "Extra arg: " << argv[i] << endl;
        	}
	}

    return (0);
}

/* functions */

void readmsg(char *x)
{
	string mbuffer, mbuffertmp;
	int mbuffertest, msglinelength;
	char *themsgfile;
	themsgfile = strcat(x, ".txt");
	ifstream msgfile(themsgfile);
	if (! msgfile.is_open())
	{
 	cout << "Error opening file"; exit (1); 
	}
	cout << "\n";
	while (! msgfile.eof())
	{
	getline(msgfile,mbuffer,'\n');
	mbuffertmp = mbuffer;
	mbuffertest = mbuffertmp.empty();
		if (mbuffertest == 0)
		{ 
		mbuffertmp = mbuffertmp.erase(1);
			if (mbuffertmp == "%")
                        {
                        msglinelength = mbuffer.length();
                                if (msglinelength > 1)
                                {
                                mbuffer = mbuffer.substr(2);
                                cout << mbuffer << endl;
                                }
                                else
                                {
                                mbuffer = mbuffer.substr(1);
                                cout << mbuffer << endl;
                                }
                        }
			else if (mbuffertmp == "T")
			{
			mbuffer = mbuffer.substr(7);
			cout << mbuffer;
			}
			else if (mbuffertmp == "D")
			{
			mbuffer = mbuffer.substr(6);
			cout << " - " << mbuffer << "\n\n";
			}
		}
	}
	cout << "\n";
}

void show_version(void)
{
	cout << "Grim " << versinfo << endl;
}

void show_help(void)
{
	cout << "Help to be implemented" << endl;
}

void show_wenda(void)
{
	cout << "This is a cookie :) I will make it more interesting later." << endl;
}