/* 
 * Copyright (c) 2009 Craig Sutherland
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

namespace FastForward.Monitor
{
    using System;
    using System.Windows.Forms;
    using FastForward.WinCore;

    /// <summary>
    /// The application context for the monitor.
    /// </summary>
    public class MonitorApplicationContext
        : ApplicationContext, IDisposable
    {
        #region Private fields
        private ApplicationConfig configuration;
        private ServerList servers;
        private MainForm mainForm;
        private bool isInitialised;
        private Timer timer = new Timer();
        #endregion

        #region Constructors
        /// <summary>
        /// Initialise a new <see cref="MonitorApplicationContext"/>.
        /// </summary>
        public MonitorApplicationContext()
        {
            AppDomain.CurrentDomain.UnhandledException += (o, e) =>
            {
                if (e.ExceptionObject is Exception)
                {
                    var errorLog = (e.ExceptionObject as Exception).SaveLog();
                    MessageBox.Show("An unhandled error occurred in the application, the application state is now unstable. It is recommended you close the application now." + Environment.NewLine + "The error log was written to " + errorLog, "Unhandled error", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                }
                else
                {
                    MessageBox.Show("An unhandled error occurred in the application, the application state is now unstable. It is recommended you close the application now.", "Unhandled error", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                }
            };
            MainForm = new SplashForm();
            MainForm.Show();
            Application.DoEvents(); // Make sure the splash form is loaded
            this.timer.Interval = 250;
            this.timer.Tick += this.LoadApplication;
            this.timer.Start();
        }
        #endregion

        #region Public methods
        #region Dispose()
        /// <summary>
        /// Clean up.
        /// </summary>
        /// <param name="disposing"></param>
        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);
            if (servers != null)
            {
                servers.Dispose();
                servers = null;
            }
        }
        #endregion
        #endregion

        #region Protected methods
        #region OnMainFormClosed()
        /// <summary>
        /// Switches from the splash form to the main form.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected override void OnMainFormClosed(object sender, EventArgs e)
        {
            if (isInitialised && (MainForm is SplashForm))
            {
                MainForm = mainForm;
                MainForm.Show();
            }
            else
            {
                if (isInitialised)
                {
                    configuration.Save();
                }

                this.ExitThread();
            }
        }
        #endregion
        #endregion

        #region Private methods
        #region LoadApplication()
        /// <summary>
        /// Performs the load of the application configuration.
        /// </summary>
        private void LoadApplication(object sender, EventArgs args)
        {
            this.timer.Stop();
            try
            {
                using (Trace.Start("Loading application"))
                {
                    // Initialise the servers
                    configuration = ApplicationConfig.Load();
                    servers = new ServerList();
                    foreach (var server in configuration.Servers)
                    {
                        using (Trace.Start("Adding server: " + server.Address))
                        {
                            servers.AddServer(server);
                        }
                    }

                    // Load an initialise the main form
                    mainForm = new MainForm(servers, configuration);
                    mainForm.InitialiseForm();

                    // Close the splash form
                    isInitialised = true;
                    MainForm.Close();
                }
            }
            catch (Exception error)
            {
                using (Trace.Start("Handling load error"))
                {
                    // Make sure the servers are shutdown otherwise we get repeating errors!
                    if (servers != null)
                    {
                        servers.Dispose();
                        servers = null;
                    }

                    // Shut down the main form if loaded
                    if (mainForm != null)
                    {
                        mainForm.Terminate();
                    }

                    // Shut down after any start-up error
                    var errorLog = error.SaveLog();
                    MessageBox.Show("An unhandled error occurred while loading the application, therefore the application will close." + Environment.NewLine + "The error log was written to " + errorLog, "Unhandled error", MessageBoxButtons.OK, MessageBoxIcon.Stop);
                    MainForm.Close();
                }
            }
        }
        #endregion
        #endregion
    }
}