using System;
using System.Collections;
using System.Windows.Forms;
using System.Threading;
using System.Drawing;
using System.IO;

namespace JwKdsV
{
    public partial class SplashScreen : Form
    {
        static SplashScreen ms_frmSplash = null;
        static Thread ms_oThread = null;

        private double m_dblOpacityIncrement = .05;
        private double m_dblOpacityDecrement = .08;
        private const int TIMER_INTERVAL = 50;

        static string ms_sStatus;
        private double m_dblCompletionFraction = 0;

        private double m_dblLastCompletionFraction = 0.0;

        private DateTime m_dtStart;
        private bool m_bDTSet = false;
        private int m_iIndex = 1;
        private int m_iActualTicks = 0;
        private ArrayList m_alPreviousCompletionFraction = null;
        private ArrayList m_alActualTimes = new ArrayList();


        public SplashScreen()
        {
            InitializeComponent();

            var splash = @"images/splash.jpg";
            if (File.Exists(splash))
            {
                this.mainPanel.BackgroundImageLayout = ImageLayout.Tile;
                this.mainPanel.BackgroundImage = Image.FromFile(splash);
            }
            
            this.Opacity = .00;
            timer.Interval = TIMER_INTERVAL;
            timer.Start();
        }

        public static void ShowSplashScreen()
        {
            if (ms_frmSplash != null)
                return;
            ms_oThread = new Thread(new ThreadStart(SplashScreen.ShowForm));
            ms_oThread.IsBackground = true;
            ms_oThread.SetApartmentState(ApartmentState.STA);
            ms_oThread.Start();
        }

        public static SplashScreen SplashForm
        {
            get
            {
                return ms_frmSplash;
            }
        }

        private static void ShowForm()
        {
            ms_frmSplash = new SplashScreen();
            ms_frmSplash.ShowDialog();
        }

        public static void CloseForm()
        {
            if (ms_frmSplash != null && ms_frmSplash.IsDisposed == false)
            {
                ms_frmSplash.m_dblOpacityIncrement = -ms_frmSplash.m_dblOpacityDecrement;
            }
            ms_oThread = null;
            ms_frmSplash = null;
        }

        public static void SetStatus(string newStatus)
        {
            SetStatus(newStatus, true);
        }

        public static void SetStatus(string newStatus, bool setReference)
        {
            ms_sStatus = newStatus;
            if (ms_frmSplash == null)
                return;
            if (setReference)
                ms_frmSplash.SetReferenceInternal();
        }

        public static void SetReferencePoint()
        {
            if (ms_frmSplash == null)
                return;
            ms_frmSplash.SetReferenceInternal();

        }

        private void SetReferenceInternal()
        {
            if (m_bDTSet == false)
            {
                m_bDTSet = true;
                m_dtStart = DateTime.Now;
            }
            double dblMilliseconds = ElapsedMilliSeconds();
            m_alActualTimes.Add(dblMilliseconds);
            m_dblLastCompletionFraction = m_dblCompletionFraction;
            if (m_alPreviousCompletionFraction != null && m_iIndex < m_alPreviousCompletionFraction.Count)
                m_dblCompletionFraction = (double)m_alPreviousCompletionFraction[m_iIndex++];
            else
                m_dblCompletionFraction = (m_iIndex > 0) ? 1 : 0;
        }


        private double ElapsedMilliSeconds()
        {
            TimeSpan ts = DateTime.Now - m_dtStart;
            return ts.TotalMilliseconds;
        }

        private void timer_Tick(object sender, System.EventArgs e)
        {
            lblStatus.Text = ms_sStatus;

            if (m_dblOpacityIncrement > 0)
            {
                m_iActualTicks++;
                if (this.Opacity < 1)
                    this.Opacity += m_dblOpacityIncrement;
            }
            else
            {
                if (this.Opacity > 0)
                    this.Opacity += m_dblOpacityIncrement;
                else
                {
                    this.Close();
                }
            }
        }
    }
}