using System;
using System.Windows.Forms;

namespace DataStreamInterfaceTest
{
    public partial class GetFrameBoundariesDlg : Form
    {
        /// <summary>
        /// Integer number entered in this form
        /// </summary>
        public Int64 From;
        public Int64 To;

        Int64 lowerLimit;
        Int64 upperLimit;


        /// <summary>
        /// Default constructor
        /// </summary>
        public GetFrameBoundariesDlg()
            : this("Enter state please")
        {
        }

        /// <summary>
        /// Constructor with a custom window title.
        /// </summary>
        /// <param name="title">Window title</param>
        public GetFrameBoundariesDlg(string title)
            : this(title, Int64.MinValue, Int64.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 GetFrameBoundariesDlg(string title, Int64 lowerLimit, Int64 upperLimit, int initialValue)
            : this(title, lowerLimit, upperLimit)
        {
            fromTextBox.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 GetFrameBoundariesDlg(string title, Int64 lowerLimit, Int64 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)
        {
            Int64 from;
            Int64 to;
            if (Int64.TryParse(fromTextBox.Text, out from) && from >= lowerLimit && from <= upperLimit &&
                Int64.TryParse(toTextBox.Text, out to) && to >= lowerLimit && to <= upperLimit &&
                to >= from && to < from + Int32.MaxValue)
            {
                From = from;
                To = to;
                DialogResult = DialogResult.OK;
            }
            else
            {
                string message = (lowerLimit != 0 || upperLimit != Int32.MaxValue)
                               ? string.Format("Invalid boundaries ({0}..{1})", lowerLimit, upperLimit)
                               : "Invalid boundaries";
                MessageBox.Show(message);
                DialogResult = DialogResult.None;   /// Prevent closing this window
            }
        }
    }
}