//Ciphers/main.cpp
//Matthew Ellison
// Created: 4-25-18
//Modified: 4-29-18
//This file contains the driver function and the test functions for the Cipher program
//This program will use some simple ciphers that are no longer widely used but still fun to play with


///The header files
#include "Headers/Caesar.hpp"
#include "Headers/Playfair.hpp"
#include "Headers/Vigenere.hpp"
#include <iostream>
#include <string>


///Test definitions
//#define TEST_VERSION

#ifdef TEST_VERSION
#define CAESAR_TEST
#define PLAYFAIR_TEST
#define VIGENERE_TEST
enum codingState { ENCODE, DECODE };
std::string testingError(codingState type, const std::string& input, const std::string& output, const std::string& cipher);
#endif //TEST_VERSION definition

#ifdef CAESAR_TEST
bool caesarTest(std::string& errorString);
#endif //CAESAR_TEST

#ifdef PLAYFAIR_TEST
bool playfairTest(std::string& errorString);
#endif //PLAYFAIR_TEST

#ifdef VIGENERE_TEST
bool vigenereTest(std::string& errorString);
#endif //VIGENERE_TEST


//Main functions
#ifdef TEST_VERSION
int main(int argc, char** argv){
	bool testResult = false;
	std::string resultString = "";
	std::string errorString = "";

	//Testing the Caesar Cipher
	#ifdef CAESAR_TEST
	testResult = caesarTest(errorString);
	//If the test was successful
	if(testResult){
		resultString += "Caesar Cipher completed successfully\n";
	}
	else{
		resultString += "Caesar Cipher error:\n" + errorString;
	}
	std::cout << "Test1: " << resultString << std::endl;
	//Reset the variables
	errorString = "";
	testResult = false;
	#endif //CAESAR_TEST

	//Testing the playfair cipher
	#ifdef PLAYFAIR_TEST
	testResult = playfairTest(errorString);
	if(testResult){
		resultString += "Playfair Cipher completed successfully\n";
	}
	else{
		resultString += "Playfair Cipher error: " + errorString;
	}
	errorString = "";
	testResult = false;
	#endif //PLAYFAIR_TEST

	#ifdef VIGENERE_TEST
	testResult = vigenereTest(errorString);
	if(testResult){
		resultString += "Vigenere Cipher completed successfully\n";
	}
	else{
		resultString += "Vigenere Cipher error: " + errorString;
	}
	errorString = "";
	testResult = false;
	#endif //VIGENERE_TEST

	std::cout << "Results:\n" << resultString << std::endl;
	std::cin.get();

	return 0;
}

std::string testingError(codingState type, const std::string& input, const std::string& output, const std::string& cipher){
	std::string errorMessage;
	//Decide if it was encoding or decoding
	if(type == ENCODE){
		errorMessage = "Encoding:";
	}
	else if(type == DECODE){
		errorMessage = "Decoding:";
	}
	else{
		errorMessage = "We gots problems";
	}
	errorMessage += "\nError in: " + input + "\nExpected: " + output + "\nActual:   " + cipher + '\n';

	return errorMessage;
}


#ifdef CAESAR_TEST
bool caesarTest(std::string& errorString){
	///Add something in error message about shift amount
	Caesar cipher;
	bool passed = true;
	std::string inputString = "";	//Holds the string to be input into the cipher
	std::string outputString = "";	//Holds the string that the cipher is expected to output
	std::string cipherString = "";	//Holds the string that the cipher actually output

	///All lowercase
	inputString = "abcdefghijklmnopqrstuvwxyz";	//Shift = 3
	outputString = "defghijklmnopqrstuvwxyzabc";	//Shift = 3
	//Try it forwards
	cipherString = cipher.encode(3, inputString);
	if(cipherString != outputString){
		//errorString += "Encoding:\nError in: " + inputString + "\nExpected: " + outputString + "\nActual:   " + cipherString + '\n';
		errorString += testingError(ENCODE, inputString, outputString, cipherString);
		passed = false;
	}
	//Try it backwards
	cipherString = cipher.decode(3, outputString);
	if(cipherString != inputString){
		//errorString += "Decoding:\nError in: " + outputString + "\nExpected: " + inputString + "\nActual:   " + cipherString + '\n';
		errorString += testingError(DECODE, outputString, inputString, cipherString);
		passed = false;
	}

	///All upercase
	inputString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	outputString = "XYZABCDEFGHIJKLMNOPQRSTUVW";
	//Try it forwards
	cipherString = cipher.encode(-3, inputString);
	if(cipherString != outputString){
		errorString += testingError(ENCODE, inputString, outputString, cipherString);
		passed = false;
	}
	//Try it backwards
	cipherString = cipher.decode(-3, outputString);
	if(cipherString != inputString){
		errorString += testingError(DECODE, outputString, inputString, cipherString);
		passed = false;
	}

	///Both cases
	inputString = "AbCdEfGhIjKlMnOpQrStUvWxYz";
	outputString = "DeFgHiJkLmNoPqRsTuVwXyZaBc";
	//Try it forwards
	cipherString = cipher.encode(3, inputString);
	if(cipherString != outputString){
		errorString += testingError(ENCODE, inputString, outputString, cipherString);
		passed = false;
	}
	//Try it backwards
	cipherString = cipher.decode(3, outputString);
	if(cipherString != inputString){
		errorString += testingError(DECODE, outputString, inputString, cipherString);
		passed = false;
	}

	///Punctuation
	inputString = "abc,def. rst; wxyz";
	outputString = "def,ghi. uvw; zabc";
	//Try it forwards
	cipherString = cipher.encode(3, inputString);
	if(cipherString != outputString){
		errorString += testingError(ENCODE, inputString, outputString, cipherString);
		passed = false;
	}
	//Try it backwards
	cipherString = cipher.decode(3, outputString);
	if(cipherString != inputString){
		errorString += testingError(DECODE, outputString, inputString, cipherString);
		passed = false;
	}

	return passed;
}
#endif //CAESAR_TEST

#ifdef PLAYFAIR_TEST
bool playfairTest(std::string& errorString){
	bool passed = true;
	std::string keyword, inputString, outputString, cipherString;
	Playfair cipher;

	//Test from wikipedia
	keyword = "Playfair Example";
	inputString = "Hide the gold in the tree stump";
	outputString = "BMODZBXDNABEKUDMUIXMMOUVIF";
	//Setup the cipher
	cipherString = cipher.encode(keyword, inputString);
	//If the cipher didn't spit out the correct string throw an error
	if(cipherString != outputString){
		errorString += testingError(ENCODE, inputString, outputString, cipherString);
		passed = false;
	}
	//This removes the spaces and turns everything capital so the reverse will work correctly
	inputString = cipher.getInputString();

	//Do the same thing in reverse
	cipher.reset();
	cipherString = cipher.decode(keyword, outputString);
	//If the cipher didn't spit out the correct string throw an error
	if(cipherString != inputString){
		errorString += testingError(DECODE, outputString, inputString, cipherString);
		passed = false;
	}

	//Return if the cipher passed the tests
	return passed;
}
#endif //PLAYFAIR_TEST

#ifdef VIGENERE_TEST
bool vigenereTest(std::string& errorString){
	bool passed = true;
	std::string keyword, inputString, outputString, cipherString;
	Vigenere cipher;

	//Test from wikipedia
	keyword = "lemon";
	inputString = "Attack at dawn";
	outputString = "LXFOPVEFRNHR";
	//Setup the cipher
	cipherString = cipher.encode(keyword, inputString);
	//If the cipher didn't spit out the correct string throw an error
	if(cipherString != outputString){
		errorString += testingError(ENCODE, inputString, outputString, cipherString);
		passed = false;
	}
	//This removes the spaces and turns everything capital so the reverse will work correctly
	inputString = cipher.getInputString();

	//Do the same thing in reverse
	cipher.reset();
	cipherString = cipher.decode(keyword, outputString);
	//If the cipher didn't spit out the correct string throw an error
	if(cipherString != inputString){
		errorString += testingError(DECODE, outputString, inputString, cipherString);
		passed = false;
	}


	//Second test from wikipedia
	keyword = "ABCD";
	inputString = "CRYPTOISSHORTFORCRYPTOGRAPHY";
	outputString = "CSASTPKVSIQUTGQUCSASTPIUAQJB";
	//Setup the cipher
	cipherString = cipher.encode(keyword, inputString);
	//If the cipher didn't spit out the correct string throw an error
	if(cipherString != outputString){
		errorString += testingError(ENCODE, inputString, outputString, cipherString);
		passed = false;
	}
	//This removes the spaces and turns everything capital so the reverse will work correctly
	inputString = cipher.getInputString();

	//Do the same thing in reverse
	cipher.reset();
	cipherString = cipher.decode(keyword, outputString);
	//If the cipher didn't spit out the correct string throw an error
	if(cipherString != inputString){
		errorString += testingError(DECODE, outputString, inputString, cipherString);
		passed = false;
	}


	//Return if the cipher passed the tests
	return passed;
}
#endif //VIGENERE_TEST

#else //TEST_VERSION main function

#include "helperFunctions.hpp"
#include <iostream>
#include <string>
#include <fstream>


int main(int argc, char** argv){
	bool cipherFlags[SIZE];
	std::string inputFileName, outputFileName, cipherString;
	std::ifstream inputFile;
	std::ofstream outputFile;
	setFlagStrings();

	//Make sure the flags are all false by default
	for(int cnt = 0;cnt < SIZE;++cnt){
		cipherFlags[cnt] = false;
	}

	//Check what flags were set
	getFlags(argc, argv, cipherFlags, inputFileName, outputFileName);
	//Make sure that only one of the ciphers was selected
	if(!checkFlags(cipherFlags)){
		std::cout << "The flags given were invalid" << std::endl;
		return 0;
	}

	//Check if output file can be opened
	if(cipherFlags[OUTPUT_FILE]){
		outputFile.open(outputFileName);
		if(outputFile.fail()){
			std::cout << "The output file could not be opened" << std::endl;
			return 0;
		}
	}
	//Check if input file can be opened
	if(cipherFlags[INPUT_FILE]){
		inputFile.open(inputFileName);
		if(inputFile.fail()){
			std::cout << "The input file could not be opened" << std::endl;
			return 0;
		}
	}

	//Run the appropriate functions for the cipher
	if(cipherFlags[CAESAR]){
		cipherString = runCaesar(inputFile, cipherFlags[ENCODE]);	
	}
	else if(cipherFlags[PLAYFAIR]){
		cipherString = runPlayfair(inputFile, cipherFlags[ENCODE]);
	}
	else if(cipherFlags[VIGENERE]){
		cipherString = runVigenere(inputFile, cipherFlags[ENCODE]);
	}
	else{
		cipherString = "There is a big problem. No valid cipher option was given.\n";
		return 0;
	}

	if(failFlag){
		std::cout << cipherString << std::endl;
		return 0;
	}

	//Decide where the cipher will be output
	if(cipherFlags[OUTPUT_FILE]){
		outputFile << cipherString << std::endl;
	}
	else{
		std::cout << cipherString << std::endl;
	}

	inputFile.close();
	outputFile.close();
	return 0;
}
#endif //TEST_VERSION