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

namespace CSOverdueAccounts.cs
{
    public partial class frmOverdueAccounts : Form
    {
        public frmOverdueAccounts()
        {
            InitializeComponent();
        }

        private void btnCalculate_Click(object sender, EventArgs e)
        {
            string strCustomerName = txtCustomerName.Text;
            if (strCustomerName == "")
            {
                MessageBox.Show("Customer Name Is A Required Field", "Error");
                return;
            }

            decimal decAmount = 0;

            if (!decimal.TryParse(txtAmountOwed.Text, out decAmount))

            {
                MessageBox.Show("A Numeric Entry For Amount Owed Is A Required Field.", "Error");
                return;

            }

            if (decAmount <= 0)
            {
                MessageBox.Show("The Amount Owed Must Be Greater Than 0", "Error");
                return;
            }

            int intDaysOverdue = 0;

            if (!int.TryParse(txtDaysOverdue.Text, out intDaysOverdue))

            {
                MessageBox.Show("A Whole Number Is A Required Field For Days Overdue", "Error");
                return;
            }

            if(intDaysOverdue <= 0)
            {
                MessageBox.Show("Days Overdue Must Be Greater Than 0", "Error");
                return;
            }

            decimal decInterest = 0;

            switch (intDaysOverdue / 10)
                {

                case 0:

                case 1:

                case 2:
                  decInterest = 0;
                    break;

                case 3:
                  decInterest =  decAmount * .05m;
                    break;

                case 4:
                    decInterest = decAmount * .05m;
                    break;

                case 5:
                    decInterest = decAmount * .05m;
                    break;

                case 6:
                   decInterest = decAmount * .10m;
                    break;

                case 7:
                    decInterest = decAmount * .10m;
                    break;

                case 8:
                    decInterest = decAmount * .10m;
                    break;

                default:
                    decInterest = decAmount * .15m;
                    break;

                }

            lstCustomerName.Items.Add(strCustomerName);
            txtCustomerName.Text = String.Empty;

            lstAmountOwed.Items.Add(decAmount.ToString("f2"));

            txtAmountOwed.Text = String.Empty;


            lstDaysOverdue.Items.Add(intDaysOverdue);
            txtDaysOverdue.Text = String.Empty;

            lstInterestDue.Items.Add(decInterest.ToString("f2"));


            List<decimal> decTotalPrice = new List<decimal>();

            decAmount += decTotalPrice.Sum();

            txtAmountOwed.Text = decAmount.ToString();



            int intAmountOwed = lstAmountOwed.Items.Count;
            double dblAmountSum = 0;
            for (int i = 0; i < intAmountOwed; i++)
            {
            dblAmountSum = dblAmountSum + double.Parse(lstAmountOwed.Items[i].ToString());
            }
            double dblAmountResult = dblAmountSum;
            lblAmountOwed.Text = dblAmountResult.ToString("f2");




            int intDaysOverdueTotal = lstDaysOverdue.Items.Count;
            double dblAvg = 0;
            for (int i = 0; i < intDaysOverdueTotal; i++)
            {
                dblAvg = dblAvg + double.Parse(lstDaysOverdue.Items[i].ToString());
            }
            double dblSumResult = dblAvg / intDaysOverdueTotal;
            lblDaysOverdue.Text = dblSumResult.ToString("f0");





            int intInterestDue = lstInterestDue.Items.Count;
            double dblInterestDue = 0;
            for (int i = 0; i < intInterestDue; i++)
            {
                dblInterestDue = dblInterestDue + double.Parse(lstInterestDue.Items[i].ToString());
            }
            double dblInterestResult = dblInterestDue;
            lblInterestOwed.Text = dblInterestResult.ToString("f2");


        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }//end class
}//end namespace