using System;
using System.Windows.Forms;

namespace DataStreamInterfaceTest
{
    public partial class GetIntegerNumberDlg : Form
    {
        /// <summary>
        /// Integer number entered in this form
        /// </summary>
        public int Number;
        
        int lowerLimit;
        int upperLimit;


        /// <summary>
        /// Default constructor
        /// </summary>
        public GetIntegerNumberDlg()
            : this("Enter integer number please")
        {
        }

        /// <summary>
        /// Constructor with a custom window title.
        /// </summary>
        /// <param name="title">Window title</param>
        public GetIntegerNumberDlg(string title)
            : this(title, Int32.MinValue, Int32.MaxValue)
        {
        }

        /// <summary>
        /// Constructor with a custom window title, limits and non-empty initial value.
        /// </summary>
        /// <param name="title">Window title</param>
        /// <param name="lowerLimit">Lower limit</param>
        /// <param name="upperLimit">Upper limit</param>
        /// <param name="initialValue">Initial value</param>
        public GetIntegerNumberDlg(string title, int lowerLimit, int upperLimit, int initialValue)
            : this(title, lowerLimit, upperLimit)
        {
            numberTextBox.Text = initialValue.ToString();
        }

        /// <summary>
        /// Constructor with a custom window title and lower/upper limits.
        /// </summary>
        /// <param name="title">Window title</param>
        /// <param name="lowerLimit">Lower limit</param>
        /// <param name="upperLimit">Upper limit</param>
        public GetIntegerNumberDlg(string title, int lowerLimit, int upperLimit)
        {
            InitializeComponent();
            this.Text = title;
            this.lowerLimit = lowerLimit;
            this.upperLimit = upperLimit;
        }


        /// <summary>
        /// OK button handler that verifies validity of the entered value.
        /// </summary>
        private void okButton_Click(object sender, EventArgs e)
        {
            int number;
            if (int.TryParse(numberTextBox.Text, out number) && number >= lowerLimit && number <= upperLimit)
            {
                Number = number;
                DialogResult = DialogResult.OK;
            }
            else
            {
                string message = (lowerLimit != Int32.MinValue || upperLimit != Int32.MaxValue)
                               ? string.Format("Invalid integer number ({0}..{1})", lowerLimit, upperLimit)
                               : "Invalid integer number";
                MessageBox.Show(message);
                DialogResult = DialogResult.None;   /// Prevent closing this window
            }
        }
    }
}