using System;
using System.Drawing;
using System.Windows.Forms;

namespace JD.MessageService
{
    /// <summary>
    /// Form used to retrieve some input from the user. Don't use directly.
    /// Use <see cref="MessageService"/> instead.
    /// </summary>
    internal partial class InputBox : Form
    {
        #region Variables

        private readonly string m_text;
        private string m_result = string.Empty;

        #endregion

        #region Constructor

        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="text"></param>
        /// <param name="caption"></param>
        /// <param name="defaultValue"></param>
        public InputBox(string text, string caption, string defaultValue)
        {
            InitializeComponent();

            m_text = text;

            LabelText = m_text;
            Text = caption;
            textBox.Text = defaultValue;
        }

        #endregion

        #region Properties

        /// <summary>
        /// The text entered by the user.
        /// </summary>
        public string Result
        {
            get
            {
                return m_result;
            }
        }
        
        private string LabelText
        {
            get
            {
                return label.Text;
            }
            set
            {
                Size size;
                using (Graphics g = this.CreateGraphics())
                {
                    Rectangle screen = Screen.PrimaryScreen.WorkingArea;
                    SizeF sizeF = g.MeasureString(value, label.Font, screen.Width - 20);
                    size = sizeF.ToSize();
                    size.Width += 4;
                }
                if (size.Width < 200)
                    size.Width = 200;
                Size clientSize = this.ClientSize;
                clientSize.Width += size.Width - label.Width;
                clientSize.Height += size.Height - label.Height;
                this.ClientSize = clientSize;
                label.Text = value;
            }
        }

        #endregion

        #region Methods

        /// <summary>
        /// Shows the form as a modal dialog with the specified owner.
        /// </summary>
        /// <param name="owner">Any object that implements <see cref="IWin32Window"/> that represents the top-level window that will own this dialog.</param>
        /// <param name="errorMessage">Error Message to display, null if none.</param>
        /// <returns>One of the <see cref="DialogResult"/> values.</returns>
        public DialogResult ShowDialog(IWin32Window owner, string errorMessage)
        {
            LabelText = string.IsNullOrEmpty(errorMessage) ? m_text : m_text + Environment.NewLine + errorMessage;
            return base.ShowDialog(owner);
        }

        #endregion

        #region Event Handlers

        private void acceptButton_Click(object sender, EventArgs e)
        {
            m_result = textBox.Text;
            DialogResult = DialogResult.OK;            
        }

        private void cancelButton_Click(object sender, EventArgs e)
        {
            m_result = null;
            DialogResult = DialogResult.Cancel;
        }

        #endregion
    }
}