using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace JacobGremillion.Cis300.Calculator
{
    public partial class Calculator : Form
    {
        bool DispMode = true;
        bool HasDecimal = false;
        bool NegativeSign = true;

        public Calculator()
        {
            InitializeComponent();
        }

        private void Calculator_Load(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void NumOne_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                ResultField.Clear();
                ResultField.Text = NumOne.Text;
            }
            else
            {
                ResultField.Text = ResultField.Text + NumOne.Text; 
            }
        }

        private void NumTwo_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                ResultField.Clear();
                ResultField.Text = NumTwo.Text;
            }
            else
            {
                ResultField.Text = ResultField.Text + NumTwo.Text;
            }
        }

        private void NumThree_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                ResultField.Clear();
                ResultField.Text = NumThree.Text;
            }
            else
            {
                ResultField.Text = ResultField.Text + NumThree.Text;
            }
        }

        private void NumFour_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                ResultField.Clear();
                ResultField.Text = NumFour.Text;
            }
            else
            {
                ResultField.Text = ResultField.Text + NumFour.Text;
            }
        }

        private void NumFive_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                ResultField.Clear();
                ResultField.Text = NumFive.Text;
            }
            else
            {
                ResultField.Text = ResultField.Text + NumFive.Text;
            }
        }

        private void NumSix_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                ResultField.Clear();
                ResultField.Text = NumSix.Text;
            }
            else
            {
                ResultField.Text = ResultField.Text + NumSix.Text;
            }
        }

        private void NumSev_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                ResultField.Clear();
                ResultField.Text = NumSev.Text;
            }
            else
            {
                ResultField.Text = ResultField.Text + NumSev.Text;
            }
        }

        private void NumEigh_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                ResultField.Clear();
                ResultField.Text = NumEigh.Text;
            }
            else
            {
                ResultField.Text = ResultField.Text + NumEigh.Text;
            }
        }

        private void NumNine_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                ResultField.Clear();
                ResultField.Text = NumNine.Text;
            }
            else
            {
                ResultField.Text = ResultField.Text + NumNine.Text;
            }
        }

        private void NumZero_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                ResultField.Clear();
                ResultField.Text = NumZero.Text;
            }
            else
            {
                ResultField.Text = ResultField.Text + NumZero.Text;
            }
        }

        private void StartOver_Click(object sender, EventArgs e)
        {
            DispMode = true;
            HasDecimal = false;
            NegativeSign = false;
            ResultField.Clear();
            ResultField.Text = "0";
        }

        private void DecButton_Click(object sender, EventArgs e)
        {
            if (DispMode == true || ResultField.Text == "0")
            {
                DispMode = false;
                HasDecimal = true;
                ResultField.Clear();
                ResultField.Text = NumZero.Text + DecButton.Text;
            }
            else if (HasDecimal == false && DispMode == false)
            {
                ResultField.Text = ResultField.Text + DecButton.Text;
                HasDecimal = true;
            }
        }

        private void PosNeg_Click(object sender, EventArgs e)
        {
            if (ResultField.Text != "0" && NegativeSign == false)
            {
                ResultField.Text = "-" + ResultField.Text;
            }

        }
    }
}