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

namespace Common.Forms
{
    public partial class ModelessForm : Form
    {
        /// <summary>
        /// Constructor to be used by the application
        /// </summary>
        /// <param name="title">Window title</param>
        /// <param name="message">Displayed message</param>
        public ModelessForm(string message, int backArgb = 0, int textArgb = 0, Font textFont = null, string title = null)
        {
            InitializeComponent();
            ControlBox = false;

            label1.Text = (message != null)  ? message : "Please wait";
            BackColor   = (backArgb != 0)    ? Color.FromArgb(backArgb) : Color.LightGreen;
            ForeColor   = (textArgb != 0)    ? Color.FromArgb(textArgb) : Color.Black;
            label1.Font = (textFont != null) ? textFont : new Font("Arial", 14, FontStyle.Regular);
            Text = (title != null) ? title : string.Empty;

            float textWidth = Graphics.FromImage(new Bitmap(1, 1)).MeasureString(label1.Text, label1.Font).Width;
            float textHeight = Graphics.FromImage(new Bitmap(1, 1)).MeasureString(label1.Text, label1.Font).Height;
            Width = (int)textWidth + 120;		/// Form width calculated from the text width
            Height += (int)textHeight;		    /// Form height calculated from the text height

            UpdateMessageHandler += delegate(object sender, MessageEventArgs args)
            {
                if (InvokeRequired) { Invoke(new EventHandler<MessageEventArgs>(OnUpdateMessage), sender, args); }
                else OnUpdateMessage(sender, args);
            };

            CloseFormHandler += delegate(object sender, EventArgs args)
            {
                if (InvokeRequired) { Invoke(new EventHandler<EventArgs>(OnCloseForm), sender, args); }
                else OnCloseForm(sender, args);
            };
        }


        /// <summary>
        /// Called from the state machine when an operation forces a modeless dialog close.
        /// </summary>
        public void UpdateMessage(MessageEventArgs args)
        {
            if (UpdateMessageHandler == null) return;
            try { UpdateMessageHandler(null, args); }
            catch (Exception) { }
        }
        public event EventHandler<MessageEventArgs> UpdateMessageHandler;
        void OnUpdateMessage(object sender, MessageEventArgs args)
        {
            if (args.Message != null) label1.Text = args.Message;
        }


        /// <summary>
        /// Called from the state machine when an operation forces a modeless dialog close.
        /// </summary>
        public static void CloseForm()
        {
            if (CloseFormHandler == null) return;
            try { CloseFormHandler(null, null); }
            catch (Exception) { }
        }
        static public event EventHandler<EventArgs> CloseFormHandler;
        void OnCloseForm(object sender, EventArgs args)
        {
            DialogResult = DialogResult.Cancel;
            Close();
        }
    }
}