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

/********************************************************
* @Author: XXXXXXXXXXXX                                 *
* @version: 2                                           *
* @Date: 02/10/2007                                     *
*    *Important Note: Gradebook file must be in correct *
*    *format to work for this program**                 *
*********************************************************/

ifstream inFile; //Used for reading in Previous Gradebook files.
ofstream outFile;//Used to create a Text file to store Gradebook information.

int hSize = 0; // Number of Homework Grades
int pSize = 0; // Number of Program Grades
int eSize = 0; // Number of Exam Grades, must be less than or equal to two.
int fSize = 0; // Tells whether the Final grade has been given or not.

int *hArray; //        
int *pArray; // Arrays for storing grades while in program.
int *eArray; //
int Final;   // The Final Grade.

//+++++++++++++++++++Global Variables++++++++++++++++++++++++++++++

void readInGrades()
{//Method to read grades from the Gradebook text file into the arrays.
	inFile>> hSize;
	inFile>> pSize;
	inFile>> eSize;
	inFile>> fSize;

	hArray = new int[hSize];
	pArray = new int[pSize];
	eArray = new int[eSize];

	for( int x = 0; x < hSize; x++)
	{	inFile>>hArray[x];	}

	for( int x = 0; x < pSize; x++)
	{	inFile>>pArray[x];	}

	for( int x = 0; x < eSize; x++)
	{	inFile>>eArray[x];	}

}
//FIX THIS
void writeOutGrades()
{//Method used to save Gradebook information into a text file.
	
	outFile<<hSize<<endl;
	outFile<<pSize<<endl;
	outFile<<eSize<<endl;
	outFile<<fSize<<endl;

	for(int x = 0; x < hSize; x++){ outFile<<hArray[x]<<endl; }

	for(int x = 0; x < pSize; x++){ outFile<<pArray[x]<<endl; } 

	for(int x = 0; x < eSize; x++){ outFile<<eArray[x]<<endl; }

	if( fSize = 1){ outFile<<Final<<endl;}

}

double Average(int array[], int array_size)
{//Method that will find the Average of any given Array.
	int sum = 0;
	for(int x = 0; x < array_size; x++)
	{
		sum += array[x];
	}
	double average = sum/array_size;

return average;
}
//FIX THIS
void inputGrade( int *array, int newElement, int array_length)
{//Adds a new Element to the array, extending the index by one.

	int temp[ array_length + 1];
	for(int x = 0; x< array_length; x++)
	{
		temp[x] = array[x];
	}
	temp[array_length] = newElement; 
	array = new int[ array_length +1];
	for(int x = 0; x < array_length; x++)
	{
		array[x]= temp[x];
	}

}

void displayChoices()
{//Method to Display all Choice options.

	cout<<"1. Enter a homework/quiz grade."<<endl;
	cout<<"2. Enter a program grade."<<endl;
	cout<<"3. Enter an exam grade."<<endl;
	cout<<"4. Enter the final exam grade."<<endl;
	cout<<"5. Show the grade report."<<endl;
	cout<<"6. Exit."<<endl<<endl;
}

void printGradeReport()
{//Method Helper for Option 5.

cout<<" Homeworks\\Quizes  (10\%):"	/*<< Average(hArray, hSize)*/	<<endl;
cout<<"         Programs  (35\%):" 	/*<< Average(pArray, pSize)*/	<<endl;
cout<<"            Exams  (30\%):"  /*<< Average(eArray, eSize)*/	<<endl;
cout<<"            Final  (25\%):"  /*<< Final*/				<<endl<<endl;

cout<<"	          Overall:"  		<<endl;

}

int selection()
{//Method which repeats while you choose to not exit the program.

displayChoices();

char choice;
cin>> choice; //Reads in User's choice.

   switch(choice)
     {

	int grade;

	case '1':
	cout<<"Homework grade: "<<endl;
	cin>>grade;
	inputGrade(hArray, grade, hSize);
	hSize++;
	return 1;
	break; 

	case '2':
	cout<<"Program grade: "<<endl;
	
	cin>>grade;
	inputGrade(pArray, grade, pSize);
	pSize++;
	return 2;
	break;

	case '3':
	if(eSize < 2)
	{
		cout<<"Exam Grade: "<<endl;	
		cin>>grade;
		inputGrade(eArray,grade,eSize);
		eSize++;
	}
	else 
	{
		cout<<"All Exam grades have been entered."<<endl;
	}
	return 3;
	break;

	case '4':
	if(fSize < 1)
	{ 
		cout<<"Final Grade: "<<endl;
		cin>> Final;
	}
	else
	{
	cout<<"Final has already been entered."<<endl;
	}
	return 4;
	break;

	case '5':
	printGradeReport();
	return 5;
	break;

	case '6': 
	cout<<"Exiting the program..."<<endl;
	writeOutGrades();
	return 6;
	break;

	default:
	cout<<"Invalid Input. Please try again."<<endl;
	return 0;

     }
}

///////////////////////////////Functions/////////////////////////////////
int main(int argc, char *argv[])
{//Main Method which Drives program.

	if (argc < 2)
	{// If number of arguments is less than two,  prompt with correct usage.
		cout<< "Usage:  "<< argv[0]<< " <gradebook file>"<<endl;
		return 0;
	}

	cout<< "Opening:  "<< argv[1] <<endl;

	inFile.open( argv[1] );
	
	if(!inFile)
	{// If gradebook file does not exist, create it with the given argument definition.

	cout<< argv[1] << " does not exist, creating new file to write gradebook to."<<endl;
	outFile.open( argv[1] );
	cout<< argv[1] << " created."<<endl;

	}	

	if(inFile){	readInGrades();	}
	
	inFile.close();
	
	outFile.open(argv[1]);

	while(selection() != 6);

	
	outFile.close();

	return 0;
}