namespace FractionCalculatorWithGUI_Final
{
   
    public partial class MainForm : Form
    {
        private enum DISPLAY_MODE { CURRRENT_VALUE, ACCUMULATOR, ERROR}
        private enum OPERATION {ADD, SUB, MUL, DIV}
        private int accumulator = 0;
        private OPERATION currentOperation = OPERATION.ADD;
        private int currentValue = 0;
        private DISPLAY_MODE displayMode = DISPLAY_MODE.CURRRENT_VALUE;
        public MainForm()
        {
            InitializeComponent();
        }
        //Text Box
        private void textBoxDisplay_TextChanged(object sender, EventArgs e)
        {

        }

        private void UpdateDisplay()
        {
            switch (displayMode)
            {
                case DISPLAY_MODE.ACCUMULATOR:
                    textBoxDisplay.Text = accumulator.ToString();
                    break;

                case DISPLAY_MODE.CURRRENT_VALUE:
                    textBoxDisplay.Text = currentValue.ToString();
                    break;

                case DISPLAY_MODE.ERROR:
                    textBoxDisplay.Text = "Error";
                    break;

            }
            
        }

        //Slash Button
        private void buttonSlash_Click(object sender, EventArgs e)
        {
            displayMode = DISPLAY_MODE.CURRRENT_VALUE;
            currentValue = 0;
            textBoxDisplay.Text = "/";
        }
        
        //numeric buttons
        private void NumberKeyHit(int number)
        {
            displayMode = DISPLAY_MODE.CURRRENT_VALUE;
            currentValue = currentValue * 10 + number;
            UpdateDisplay();
        }
        private void button0_Click(object sender, EventArgs e)
        {
            
            NumberKeyHit(0);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            NumberKeyHit(1);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            NumberKeyHit(2);
        }
        private void button3_Click(object sender, EventArgs e)
        {
            NumberKeyHit(3);
        }

        private void button4_Click(object sender, EventArgs e)
        {
            NumberKeyHit(4);
        }

        private void button5_Click(object sender, EventArgs e)
        {
            NumberKeyHit(5);
        }

        private void button6_Click(object sender, EventArgs e)
        {
            NumberKeyHit(6);
        }

        private void button7_Click(object sender, EventArgs e)
        {
            NumberKeyHit(7);
        }

        private void button8_Click(object sender, EventArgs e)
        {
            NumberKeyHit(8);
        }

        private void button9_Click(object sender, EventArgs e)
        {
            NumberKeyHit(9);
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            UpdateDisplay();
        }

        private void OperationKeyHit(OPERATION op)
        {
            PerformOperation();
            currentOperation= op;
            currentValue = 0;
            UpdateDisplay();
        }

        //mathematical operations
        private void PerformOperation()
        {
            switch (currentOperation)
            {
                case OPERATION.ADD:
                    accumulator += currentValue;
                    break;
                
                case OPERATION.SUB:
                    accumulator -= currentValue;
                    break;

                case OPERATION.MUL:
                    accumulator *= currentValue;
                    break;

                case OPERATION.DIV:
                    accumulator /= currentValue;
                    break;
            }
            currentValue = 0;
            displayMode = DISPLAY_MODE.ACCUMULATOR;
            UpdateDisplay();

        }
        //Operational Buttons
        private void buttonPlus_Click(object sender, EventArgs e)
        {
            OperationKeyHit(OPERATION.ADD);
        }

        private void buttonEquals_Click(object sender, EventArgs e)
        {
           PerformOperation();
        }

        private void buttonMinus_Click(object sender, EventArgs e)
        {
            OperationKeyHit(OPERATION.SUB);
        }

        private void buttonDivide_Click(object sender, EventArgs e)
        {
            OperationKeyHit(OPERATION.DIV);
        }

        private void buttonTimes_Click(object sender, EventArgs e)
        {
            OperationKeyHit(OPERATION.MUL);
        }

        private void buttonClear_Click(object sender, EventArgs e)
        {
            currentValue = 0;
            displayMode = DISPLAY_MODE.CURRRENT_VALUE;
            UpdateDisplay();
        }

        private void buttonAllClear_Click(object sender, EventArgs e)
        {
            currentValue = 0;
            accumulator= 0;
            displayMode = DISPLAY_MODE.CURRRENT_VALUE;
            currentOperation = OPERATION.ADD;
            UpdateDisplay();
        }

        
    }
}