using System;
using System.Runtime.CompilerServices;
using System.Windows.Forms;

namespace MidtermProject
{
    public partial class Midterm : Form
    {
        //  Tax Rates
        private const decimal STANDARD_TAX_RATE = 0.06m;
        private const decimal INSTATE_TAX_RATE = 0.04m;

        //  Prices
        private const decimal BLUE_COST = 24.99m;
        private const decimal YELLOW_COST = 15.97m;


        //  Running totals
        private int transactions;
        private int yellowSold;
        private int blueSold;
        private decimal totalSum;
        
        //  Integer Limit Checks
        private double dubBlue = 0;
        private double dubYellow = 0;

        private int track;

        private decimal tax = STANDARD_TAX_RATE;

        private readonly ErrorProvider ep1 = new ErrorProvider();


        public Midterm()
        {
            InitializeComponent();
            LoadForm();
        }

        private void LoadForm()
        {
            lblSumBlue.Text = "0";
            lblSumYellow.Text = "0";
            lblAvg.Text = "0";
            lblTransactions.Text = "0";
            lblSumGrandTotal.Text = "0";
            grpSummary.Visible = false;
            btnNext.Enabled = false;
            btnCalc.Enabled = false;
            btnReset.Enabled = false;
        }

        private void lblDisAvg_Click(object sender, EventArgs e)
        {
            // throw new System.NotImplementedException();
        }

        private void chkSummary_CheckedChanged(object sender, EventArgs e)
        {
            if (chkSummary.Checked)
                grpSummary.Visible = true;
            else
                grpSummary.Visible = false;
        }

        private void chkTax_CheckedChanged(object sender, EventArgs e)
        {
            if (chkTax.Checked)
                tax = INSTATE_TAX_RATE;
            else
                tax = STANDARD_TAX_RATE;
        }

        private decimal Calculate(int qBlue, int qYellow)
        {
            decimal cost;
            transactions++;

            yellowSold += qYellow;
            blueSold += qBlue;
            dubYellow += qYellow;
            dubBlue += qBlue;

            cost = qBlue * BLUE_COST * (1 + tax) + qYellow * YELLOW_COST * (1 + tax);
            totalSum += cost;
            return cost;
        }

        private void btnCalc_Click(object sender, EventArgs e)
        {
            Int32 qBlue = 0;
            Int32 qYellow = 0;
            
            
            try
            {
                
                
                try
                {
                    qBlue = int.Parse(txtBlue.Text);
                }
                catch (Exception exception)
                {
                    ep1.SetError(txtBlue, "Invalid Value");
                    throw new Exception();
                }

                try
                {
                    qYellow = int.Parse(txtYellow.Text);
                }
                catch (Exception exception)
                {
                    ep1.SetError(txtYellow, "Invalid Value");
                    throw new Exception();
                }

                //  Check to make sure sales dont surpass integer limits

                try
                {
                    
                    if (blueSold + qBlue != dubBlue + qBlue)
                    {
                        throw new Exception();
                    }
                    
                }
                catch (Exception exception)
                {
                    ep1.SetError(txtBlue, "We Can't Sell That Many");
                    throw;
                    
                }
                
                try
                {
                    
                    if (yellowSold + qYellow != dubYellow + qYellow)
                    {
                        throw new Exception();
                    }
                    
                }
                catch (Exception exception)
                {
                    ep1.SetError(txtYellow, "We Can't Sell That Many");
                    throw;
                    
                }
                
                if (txtBlue.Text.Length > 0 || txtYellow.Text.Length > 0)
                    try
                    {
                        lblTotal.Text = Calculate(qBlue, qYellow).ToString("C");
                    }
                    catch (Exception exception)
                    {
                        ep1.SetError(btnCalc, "Calculation Error");
                    }
                else
                    MessageBox.Show("Whoops!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                
                
                track++;
            }
            catch (Exception exception)
            {
                //  Dont Run Calculations
            }

            UpdateForm();
        }

        private void UpdateForm()
        {
            lblSumBlue.Text = blueSold.ToString("N0");
            lblSumYellow.Text = yellowSold.ToString("N0");
            if (transactions > 0)
            {
                lblAvg.Text = (totalSum / transactions).ToString("C");
                btnReset.Enabled = true;
            }
            else
            {
                lblAvg.Text = "0";
                btnReset.Enabled = false;
            }

            lblTransactions.Text = transactions.ToString("N0");
            lblSumGrandTotal.Text = totalSum.ToString("C");

            if (track > 0)
                btnNext.Enabled = true;
            else
                btnNext.Enabled = false;

            if (txtBlue.Text.Length > 0 && txtYellow.Text.Length > 0)
            {
                btnCalc.Enabled = true;
            }
            else
            {
                btnCalc.Enabled = false;
            }
            
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            Close();
        }

        private void txtBlue_TextChanged(object sender, EventArgs e)
        {
            UpdateForm();
            ep1.Clear();
        }

        private void btnNext_Click(object sender, EventArgs e)
        {
            track = 0;

            txtBlue.Text = "";
            txtYellow.Text = "";
            lblTotal.Text = "";
            chkTax.Checked = false;

            txtBlue.Focus();

            UpdateForm();
        }

        private void txtYellow_TextChanged(object sender, EventArgs e)
        {
            UpdateForm();
            ep1.Clear();
        }

        private void btnReset_Click(object sender, EventArgs e)
        {
            DialogResult btnDialog;
            string strResponse;

            strResponse = "Do you really want to reset all statistics?";

            btnDialog = MessageBox.Show(strResponse, "Midterm", MessageBoxButtons.YesNo, MessageBoxIcon.Question,
                MessageBoxDefaultButton.Button2);

            if (btnDialog == DialogResult.Yes)
            {
                transactions = 0;
                yellowSold = 0;
                blueSold = 0;
                totalSum = 0;
                track = 0;

                txtBlue.Text = "";
                txtYellow.Text = "";
                lblTotal.Text = "";

            }

            UpdateForm();
        }
    }
}