#include <iostream>
#include <time.h>

using std::cin;
using std::cout;
using std::endl;

const int SLICES = 25;
const int ROWS = 4;
const int COLUMNS = 4;

void getMatrixFromUser(int matrix[][COLUMNS]);
void displayMatrix(int matrix[][COLUMNS]);
void addMatrices(int matrix1[][COLUMNS], int matrix2[][COLUMNS], int resultMatrix[][COLUMNS]);
void subtractMatrices(int matrix1[][COLUMNS], int matrix2[][COLUMNS], int resultMatrix[][COLUMNS]);
void scalarMultiply(int matrix[][COLUMNS], int scalar, int resultMatrix[][COLUMNS]);
void transposeMatrix(int matrix[][COLUMNS], int resultMatrix[][COLUMNS]);


void main()
{
	int matrices[SLICES][ROWS][COLUMNS];
	int matricesUsed = 0;
	int initialMatrices;

	cout << "How many initial matrices?";
	cin >> initialMatrices;

	for(int i = 0; i < initialMatrices; i++)
	{
		getMatrixFromUser(matrices[matricesUsed]);
		matricesUsed++;
	}

	char operation;

	do
	{
		//todo: prompt for input
		cout << "Operation?";
		cin >> operation;
		switch(operation)
		{
		case '+':
			int addIndex1;
			int addIndex2;

			//data validaion
			cout << " First matrix for +?";
			cin >> addIndex1;
			cout << "Second matrix for +?";
			cin >> addIndex2;

			addMatrices(matrices[addIndex1-1], matrices[addIndex2-1], matrices[matricesUsed]);
			displayMatrix(matrices[matricesUsed]);
			matricesUsed++;
			break;
		case '-':
			matricesUsed++;
			break;
		case '*':
			matricesUsed++;
			break;
		case 'D': case 'd':
			int indexToDisplay;
			//add data validation
			cout << "Matrix to Display? ";
			cin >> indexToDisplay;

			displayMatrix(matrices[indexToDisplay-1]);
			break;
		case 'T': case 't':
			matricesUsed++;
			break;
		case 'X':
			//optional/extra credit
			matricesUsed++;
			break;
		}
	}
	while(operation != 'Q' && operation != 'q' && matricesUsed < 25);

}
void displayMatrix(int matrix[][COLUMNS])
{
	for(int i= 0; i < ROWS; i++)
	{
		cout << "Row " << i+1 << ": ";
		for(int j = 0; j < COLUMNS;j++)
		{
			cout << matrix[i][j] << " ";
		}
		cout << endl;
	}
}

void addMatrices(int matrix1[][COLUMNS], int matrix2[][COLUMNS], int resultMatrix[][COLUMNS])
{
	for(int i= 0; i < ROWS; i++)
	{
		for(int j = 0; j < COLUMNS;j++)
		{
			resultMatrix[i][j] =  matrix1[i][j]+matrix2[i][j];
		}
	}
}

void getMatrixFromUser(int matrix[][COLUMNS])
{
	for(int i= 0; i < ROWS; i++)
	{
		cout << "Row " << i+1 << "?";
		for(int j = 0; j < COLUMNS;j++)
		{
			cin >> matrix[i][j];
		}
	}
}