//Write a program that takes a file for input (hard coded or user inputted, doesn't matter)
//and saves a new file with the text on each line reversed.

#include <fstream>
#include <iomanip>
#include <iostream>
#include <string> //probly don't need it
#include <vector>
#include <stack>

using namespace std;

struct CommandLineException {
	CommandLineException(int max,int actual){
		cout << endl << "Too many files, MORON! \n";
		cout << "Only " << max << " arguments are permitted. \n";
		cout << actual << " arguments were entered. \n";
	}
};
struct FileException {
	FileException(char* fn){
		cout << "\n file " <<fn<< " couldn't be opened. \n";
	}
};

void stringreverser(ifstream& ifn, ofstream& ofn){
     std::stack< char, std::vector<char> > input; 
	 // never used a vector or used the built in stack class before, didn't feel like making my own stack
	 //probly could do without it all together
     char v;
     for(;;){ // don't try this at home kids.
             while(ifn.get(v)){ // try learning this one from scratch, HINT: get() returns an int
			 input.push(v);
                 if(v == '\n'){break;}
                 //if the last line of the inputfile dosn't have a \n then it 
                 //and the line before it will be the same line in the outputfile
             }
             while(!input.empty()){
                  ofn<<input.top();
                  input.pop();
             }
             if (ifn.eof()){break;}
     }
                
}
/** everything from here down should be damn easy for anyone who's had a year of c++ **/
int main(int argc, char* argv[]){
	try {
		char inputfilename[255], outputfilename[255];
		switch (argc) {
			case 1:
				cout << "USAGE: progname inputfile outputfile \n";
				cout << "Need an input file. \n";
				cin >> inputfilename;
				cout << "Need an outputfile. \n";
				cin >> outputfilename;
				break;
			case 2:
				strcpy(inputfilename,argv[1]);
				cout << "Need an outputfile. ";
				cin >> outputfilename;
				break;
			case 3:
				strcpy(inputfilename,argv[1]);
				strcpy(outputfilename,argv[2]);
				break;
				default:
				throw CommandLineException(2,argc-1);
				break;
		}
		ifstream ifn(inputfilename); if (!ifn) throw FileException(inputfilename);
		ofstream ofn(outputfilename); if (!ofn) throw FileException(outputfilename);
		
		stringreverser(ifn, ofn);
		
		ofn.close();
		ifn.close();
	}
	 catch(...) {
		cout << endl << "Game Over" << endl;
        exit(EXIT_FAILURE);
	}




}