//

// Copyright (C) 2014-2016 Stéphane Lenclud.

//

// This file is part of SharpDisplayManager.

//

// SharpDisplayManager is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// SharpDisplayManager is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with SharpDisplayManager.  If not, see <http://www.gnu.org/licenses/>.

//

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Diagnostics;

using SharpLib.Display;

namespace SharpDisplayClientIdle

{

    /// <summary>

    /// Sharp Display Client designed to act as an idle client.

    /// It should take care of screen saving and other such concerns.

    /// </summary>

    public partial class FormClientIdle : Form

    {

        public StartParams Params { get; set; }

        Client iClient;

        ContentAlignment iAlignment;

        TextField iTextField;

        //Used to determine if screen saver need to kick in

        private PowerManager.SettingNotifier iPowerSettingNotifier;

        private bool MonitorPowerOn;

        public delegate void CloseDelegate();

        public delegate void CloseConnectionDelegate();

        public FormClientIdle()

        {

            InitializeComponent();

        }

        /// <summary>

        /// 

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void FormClientIdle_Load(object sender, EventArgs e)

        {

            //Prevents showing in the Open Task view (Windows Key + Tab)

            Visible = false;

            //Display client

            iClient = new Client();

            iClient.CloseOrderEvent += OnCloseOrder;

            iClient.Open();

            iClient.SetName("Idle");

            iClient.SetPriority(Priorities.Background);

            SetupDisplayClient();

            //Timer

            iTimer.Interval = IntervalToNextMinute();

            iTimer.Start();

            //Create our power setting notifier and register the event we are interested in

            iPowerSettingNotifier = new PowerManager.SettingNotifier(Handle);

            iPowerSettingNotifier.OnMonitorPowerOn += OnMonitorPowerOn;

            iPowerSettingNotifier.OnMonitorPowerOff += OnMonitorPowerOff;

            MonitorPowerOn = true;

        }

        /// <summary>

        /// Broadcast messages to subscribers.

        /// </summary>

        /// <param name="message"></param>

        protected override void WndProc(ref Message aMessage)

        {

            //Hook in our power manager

            if (iPowerSettingNotifier != null)

            {

                iPowerSettingNotifier.WndProc(ref aMessage);

            }

            base.WndProc(ref aMessage);

        }

        /// <summary>

        /// 

        /// </summary>

        private void OnMonitorPowerOn()

        {

            MonitorPowerOn = true;

            UpdateDisplay();

        }

        /// <summary>

        /// 

        /// </summary>

        private void OnMonitorPowerOff()

        {

            MonitorPowerOn = false;

            UpdateDisplay();

        }

        /// <summary>

        /// 

        /// </summary>

        /// <returns></returns>

        public static int IntervalToNextMinute()

        {

            DateTime now = DateTime.Now;

            return 60000 - now.Millisecond;

        }

        /// <summary>

        /// 

        /// </summary>

        /// <returns></returns>

        public bool IsClientReady()

        {

            return (iClient != null && iClient.IsReady());

        }

        /// <summary>

        /// 

        /// </summary>

        public void SetupDisplayClient()

        {

            //Setup our layout

            //Set one column one line layout

            TableLayout layout = new TableLayout(1, 1);

            iClient.SetLayout(layout);

            //Setup our fields

            iAlignment = ContentAlignment.MiddleCenter;

            iTextField = new TextField(DateTime.Now.ToString("t"), iAlignment, 0, 0);

            //Set our fields

            iClient.CreateFields(new DataField[]

            {

                iTextField

            });

        }

        public void OnCloseOrder()

        {

            CloseThreadSafe();

        }

        /// <summary>

        ///

        /// </summary>

        public void CloseThreadSafe()

        {

            if (this.InvokeRequired)

            {

                //Not in the proper thread, invoke ourselves

                CloseDelegate d = new CloseDelegate(CloseThreadSafe);

                this.Invoke(d, new object[] { });

            }

            else

            {

                //We are in the proper thread

                Close();

            }

        }

        /// <summary>

        ///

        /// </summary>

        public void CloseConnectionThreadSafe()

        {

            if (this.InvokeRequired)

            {

                //Not in the proper thread, invoke ourselves

                CloseConnectionDelegate d = new CloseConnectionDelegate(CloseConnectionThreadSafe);

                this.Invoke(d, new object[] { });

            }

            else

            {

                //We are in the proper thread

                if (IsClientReady())

                {

                    string sessionId = iClient.SessionId;

                    Trace.TraceInformation("Closing client: " + sessionId);

                    iClient.Close();

                    Trace.TraceInformation("Closed client: " + sessionId);

                }

                iClient = null;

            }

        }

        /// <summary>

        /// 

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void FormClientIdle_FormClosing(object sender, FormClosingEventArgs e)

        {

            CloseConnectionThreadSafe();

        }

        /// <summary>

        /// 

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void iTimer_Tick(object sender, EventArgs e)

        {

            //Timer

            iTimer.Interval = IntervalToNextMinute();

            iTimer.Start();

            UpdateDisplay();

        }

        /// <summary>

        /// 

        /// </summary>

        private void UpdateDisplay()

        {

            //

            if (String.IsNullOrEmpty(iTextField.Text))

            {

                //Time to show our time

                iTextField.Text = DateTime.Now.ToString("t");

            }

            else

            {

                //Do some screen saving                

                iTextField.Text = "";

            }

            // Update our field

            iClient.SetField(iTextField);

            //Now make sure we save our screen from any running system monitor

            //We don't go into screen saving mode if our monitor is still on

            if (String.IsNullOrEmpty(iTextField.Text) && !MonitorPowerOn)

            {

                //If text it empty it means we need to cool down our display even if system monitor is running

                iClient.SetPriority(Priorities.SystemMonitor + 1);

            }

            else

            {

                //Switch back to background then, leaving system monitor if any doing its magic

                iClient.SetPriority(Priorities.Background);

            }

        }

        /// <summary>

        /// 

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void FormClientIdle_Shown(object sender, EventArgs e)

        {

            //Visible = false;

        }

    }

}