using Resources;
using SmartCoalApplication.Actions;
using SmartCoalApplication.Base;
using SmartCoalApplication.Core;
using SmartCoalApplication.Resources;
using SmartCoalApplication.SystemLayer;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace SmartCoalApplication
{
    internal sealed class MainForm : PdnBaseForm
    {
        public AppWorkspace appWorkspace;
        private FloatingToolForm[] floaters;
        private System.Windows.Forms.Timer floaterOpacityTimer;
        private Timer deferredInitializationTimer;
        private IContainer components;
        private bool killAfterInit = false;
        //private SplashForm splashForm = null;
        private List<string> queuedInstanceMessages = new List<string>();

        private void SingleInstanceManager_InstanceMessageReceived(object sender, EventArgs e)
        {
            BeginInvoke(new Procedure(ProcessQueuedInstanceMessages), null);
        }

        public MainForm() : this(new string[0])
        {

        }

        public const int WM_DEVICECHANGE = 0x219;
        public const int DBT_DEVNODES_CHANGED = 0x0007;
        protected override void WndProc(ref Message m)
        {
            if (m.Msg == WM_DEVICECHANGE)    //设备改变消息
            {
                switch (m.WParam.ToInt32())
                {
                    case DBT_DEVNODES_CHANGED:

                        break;
                }
            }
            base.WndProc(ref m);
        }

        private enum ArgumentAction
        {
            Open,
            OpenUntitled,
            NoOp
        }

        private bool SplitMessage(string message, out ArgumentAction action, out string actionParm)
        {
            if (message.Length == 0)
            {
                action = ArgumentAction.NoOp;
                actionParm = null;
                return false;
            }

            const string untitledPrefix = "untitled:";

            if (message.IndexOf(untitledPrefix) == 0)
            {
                action = ArgumentAction.OpenUntitled;
                actionParm = message.Substring(untitledPrefix.Length);
                return true;
            }

            action = ArgumentAction.Open;
            actionParm = message;
            return true;
        }

        private bool ProcessMessage(string message)
        {
            if (IsDisposed)
            {
                return false;
            }

            ArgumentAction action;
            string actionParm;
            bool result;

            result = SplitMessage(message, out action, out actionParm);

            if (!result)
            {
                return true;
            }

            switch (action)
            {
                case ArgumentAction.NoOp:
                    result = true;
                    break;

                case ArgumentAction.Open:
                    Activate();
                    if (IsCurrentModalForm && Enabled)
                    {
                        result = this.appWorkspace.OpenFileInNewWorkspace(actionParm);
                    }
                    break;

                case ArgumentAction.OpenUntitled:
                    Activate();

                    if (!string.IsNullOrEmpty(actionParm) && IsCurrentModalForm && Enabled)
                    {
                        result = this.appWorkspace.OpenFileInNewWorkspace(actionParm, false);

                        if (result)
                        {
                            this.appWorkspace.ActiveDocumentWorkspace.SetDocumentSaveOptions(null);
                            this.appWorkspace.ActiveDocumentWorkspace.Document.Dirty = true;
                        }
                    }
                    break;

                default:
                    throw new InvalidEnumArgumentException();
            }

            return result;
        }

        private void ProcessQueuedInstanceMessages()
        {
            if (IsDisposed)
            {
                return;
            }

            if (Program.instance.splashForm != null)
            {
                Program.instance.splashForm.Close();
                Program.instance.splashForm.Dispose();
                Program.instance.splashForm = null;
            }
        }

        private void Application_Idle(object sender, EventArgs e)
        {
            if (!this.IsDisposed && this.queuedInstanceMessages.Count > 0)
            {
                ProcessQueuedInstanceMessages();
            }
        }
        private void PositionFloatingForms()
        {
            this.appWorkspace.ResetFloatingForms();

            try
            {
                SnapManager.Load(Settings.CurrentUser);
            }

            catch
            {
                this.appWorkspace.ResetFloatingForms();
            }

            foreach (FloatingToolForm ftf in floaters)
            {
                this.AddOwnedForm(ftf);
            }

            if (Settings.CurrentUser.GetBoolean(SettingNames.RuleListFormVisible, false))
            {
                this.appWorkspace.Widgets.RuleListForm.Show();
            }
            // If the floating form is off screen somehow, reset it
            // We've been getting a lot of reports where people say their Colors window has disappeared
            Screen[] allScreens = Screen.AllScreens;

            foreach (FloatingToolForm ftf in this.floaters)
            {
                if (!ftf.Visible)
                {
                    continue;
                }

                bool reset = false;

                try
                {
                    bool foundAScreen = false;

                    foreach (Screen screen in allScreens)
                    {
                        Rectangle intersect = Rectangle.Intersect(screen.Bounds, ftf.Bounds);

                        if (intersect.Width > 0 && intersect.Height > 0)
                        {
                            foundAScreen = true;
                            break;
                        }
                    }

                    if (!foundAScreen)
                    {
                        reset = true;
                    }
                }

                catch (Exception)
                {
                    reset = true;
                }

                if (reset)
                {
                    this.appWorkspace.ResetFloatingForm(ftf);
                }
            }

            this.floaterOpacityTimer.Enabled = true;
        }

        public MainForm(string[] args)
        {
            bool canSetCurrentDir = true;

            this.StartPosition = FormStartPosition.WindowsDefaultLocation;

            //bool splash = false;
            List<string> fileNames = new List<string>();

            // Parse command line arguments
            foreach (string argument in args)
            {
                if (0 == string.Compare(argument, "/dontForceGC"))
                {
                    Utility.AllowGCFullCollect = false;
                }
                else if (0 == string.Compare(argument, "/splash", true))
                {
                    //splash = true;
                }
                else if (argument.Length > 0 && argument[0] != '/')
                {
                    //try
                    //{
                    //    string fullPath = Path.GetFullPath(argument);
                    //    fileNames.Add(fullPath);
                    //}

                    //catch (Exception)
                    //{
                    //    fileNames.Add(argument);
                    //    canSetCurrentDir = false;
                    //}

                    //splash = true;
                }
            }

            if (canSetCurrentDir)
            {
                try
                {
                    Environment.CurrentDirectory = PdnInfo.GetApplicationDir();
                }

                catch (Exception)
                {

                }
            }

            //if (Program.instance.configModel.StartImgStatus == 2)
            //{
            //    this.splashForm = new SplashForm(Program.instance.configModel.StartImg);
            //    this.splashForm.TopMost = true;
            //    this.splashForm.Show();
            //    this.splashForm.Update();
            //}

            InitializeComponent();

            this.Icon = PdnInfo.AppIcon;

            LoadSettings();

            if (Program.instance.splashForm != null && !Program.instance.splashForm.IsDisposed)
                Program.instance.splashForm.Hide();

            LoadWindowState();

            deferredInitializationTimer.Enabled = true;
            Application.Idle += new EventHandler(Application_Idle);
            this.Shown += new EventHandler(this.MainForm_Shown);
        }

        private void MainForm_Shown(object sender, EventArgs e)
        {
            this.appWorkspace.ToolBar.test1(false);
            this.appWorkspace.SetTopLeftCheckState();

            if (Program.instance.configModel.autoOpenDialog) {

                using (AutomaticMeasurement.AutomaticMeasurement af = new AutomaticMeasurement.AutomaticMeasurement(this.appWorkspace))
                {
                    af.StartPosition = FormStartPosition.CenterScreen;
                    af.ShowDialog(this.appWorkspace);
                }
            }

            #region [获取系统内存]

            Task.Factory.StartNew(() => 
            {
                while (true)
                {
                    System.Threading.Thread.Sleep(1000 * 60);

                    PerformanceCounter ramCounter;
                    ramCounter = new PerformanceCounter("Memory", "Available MBytes");

                    if (ramCounter.NextValue() <= 100f)
                    {
                        MessageBox.Show("内存即将不足，请谨慎操作！");
                        System.Threading.Thread.Sleep(1000 * 60);
                    }
                }
            });
          
            #endregion
        }

        protected override void OnShown(EventArgs e)
        {
            base.OnShown(e);
        }

        private void LoadWindowState()
        {
            try
            {
                FormWindowState fws = (FormWindowState)Enum.Parse(typeof(FormWindowState),
                    Settings.CurrentUser.GetString(SettingNames.WindowState, WindowState.ToString()), true);

                if (fws != FormWindowState.Minimized)
                {
                    if (fws != FormWindowState.Maximized)
                    {
                        Rectangle newBounds = Rectangle.Empty;
                        newBounds.Width = Settings.CurrentUser.GetInt32(SettingNames.Width, this.Width);
                        newBounds.Height = Settings.CurrentUser.GetInt32(SettingNames.Height, this.Height);

                        int left = Settings.CurrentUser.GetInt32(SettingNames.Left, this.Left);
                        int top = Settings.CurrentUser.GetInt32(SettingNames.Top, this.Top);
                        newBounds.Location = new Point(left, top);

                        this.Bounds = newBounds;
                    }

                    this.WindowState = fws;
                }
            }
            catch
            {
                try
                {
                    Settings.CurrentUser.Delete(
                        new string[]
                        {
                            SettingNames.Width,
                            SettingNames.Height,
                            SettingNames.WindowState,
                            SettingNames.Top,
                            SettingNames.Left
                        });
                }
                catch
                {
                
                }
            }
        }

        private void LoadSettings()
        {
            try
            {
                PdnBaseForm.EnableOpacity = Settings.CurrentUser.GetBoolean(SettingNames.TranslucentWindows, true);
            }
            catch (Exception)
            {
                try
                {
                    Settings.CurrentUser.Delete(
                        new string[]
                        {
                            SettingNames.TranslucentWindows
                        });
                }
                catch
                {
                }
            }
        }

        private void SaveSettings()
        {
            Settings.CurrentUser.SetInt32(SettingNames.Width, this.Width);
            Settings.CurrentUser.SetInt32(SettingNames.Height, this.Height);
            Settings.CurrentUser.SetInt32(SettingNames.Top, this.Top);
            Settings.CurrentUser.SetInt32(SettingNames.Left, this.Left);
            Settings.CurrentUser.SetString(SettingNames.WindowState, this.WindowState.ToString());
            Settings.CurrentUser.SetBoolean(SettingNames.TranslucentWindows, PdnBaseForm.EnableOpacity);
            this.appWorkspace.SaveSettings();
        }

        protected override void OnQueryEndSession(CancelEventArgs e)
        {
            if (IsCurrentModalForm)
            {
                OnClosing(e);
            }
            else
            {
                foreach (Form form in Application.OpenForms)
                {
                    PdnBaseForm asPDF = form as PdnBaseForm;

                    if (asPDF != null)
                    {
                        asPDF.Flash();
                    }
                }

                e.Cancel = true;
            }

            base.OnQueryEndSession(e);
        }

        protected override void OnClosing(CancelEventArgs e)
        {
            if (!e.Cancel)
            {
                if (this.appWorkspace != null)
                {
                    if (this.appWorkspace.DocumentWorkspaces != null && this.appWorkspace.DocumentWorkspaces.Length > 0)
                    {
                        foreach (DocumentWorkspace document in this.appWorkspace.DocumentWorkspaces)
                        {
                            CloseWorkspaceAction action = new CloseWorkspaceAction();
                            this.appWorkspace.PerformAction(action);
                            e.Cancel = action.Cancelled;
                            if (e.Cancel) break;
                        }
                    }
                }
            }

            if (!e.Cancel)
            {
                SaveSettings();

                this.Hide();

                if (this.queuedInstanceMessages != null)
                {
                    this.queuedInstanceMessages.Clear();
                }
            }

            base.OnClosing(e);
        }

        protected override void OnClosed(EventArgs e)
        {
            base.OnClosed(e);
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (this.components != null)
                {
                    this.components.Dispose();
                    this.components = null;
                }

                if (this.floaterOpacityTimer != null)
                {
                    this.floaterOpacityTimer.Tick -= new System.EventHandler(this.FloaterOpacityTimer_Tick);
                    this.floaterOpacityTimer.Dispose();
                    this.floaterOpacityTimer = null;
                }
            }

            try
            {
                base.Dispose(disposing);
            }

            catch (RankException)
            {
                // System.Windows.Forms.PropertyStore
                // Discard error - bug #2746
            }
        }

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new Container();
            this.appWorkspace = new AppWorkspace(this);
            this.floaterOpacityTimer = new System.Windows.Forms.Timer(this.components);
            this.deferredInitializationTimer = new System.Windows.Forms.Timer(this.components);
            this.SuspendLayout();
            // 
            // floaterOpacityTimer
            // 
            this.floaterOpacityTimer.Enabled = false;
            this.floaterOpacityTimer.Interval = 25;
            this.floaterOpacityTimer.Tick += new System.EventHandler(this.FloaterOpacityTimer_Tick);
            // 
            // appWorkspace
            // 
            this.appWorkspace.Dock = System.Windows.Forms.DockStyle.Fill;
            this.appWorkspace.Location = new System.Drawing.Point(0, 0);
            this.appWorkspace.Name = "appWorkspace";
            this.appWorkspace.Size = new System.Drawing.Size(752, 648);
            this.appWorkspace.TabIndex = 2;
            this.appWorkspace.ActiveDocumentWorkspaceChanging += new EventHandler(AppWorkspace_ActiveDocumentWorkspaceChanging);
            this.appWorkspace.ActiveDocumentWorkspaceChanged += new EventHandler(AppWorkspace_ActiveDocumentWorkspaceChanged);

            //
            // deferredInitializationTimer
            //
            this.deferredInitializationTimer.Interval = 250;
            this.deferredInitializationTimer.Tick += new EventHandler(DeferredInitialization);
            // 
            // MainForm
            // 
            try
            {
                this.AllowDrop = true;
            }

            catch (InvalidOperationException)
            {
                // Discard error. See bug #2605.
            }

            this.AutoScaleDimensions = new SizeF(96F, 96F);
            this.AutoScaleMode = AutoScaleMode.Dpi;
            this.ClientSize = new Size(950, 738);
            this.Controls.Add(this.appWorkspace);
            this.Name = "MainForm";
            this.StartPosition = FormStartPosition.WindowsDefaultLocation;
            this.ForceActiveTitleBar = true;
            this.KeyPreview = true;
            this.Controls.SetChildIndex(this.appWorkspace, 0);
            this.ResumeLayout(false);
            this.PerformLayout();
        }

        private void AppWorkspace_ActiveDocumentWorkspaceChanging(object sender, EventArgs e)
        {
            if (this.appWorkspace.ActiveDocumentWorkspace != null)
            {
                this.appWorkspace.ActiveDocumentWorkspace.ScaleFactorChanged -= DocumentWorkspace_ScaleFactorChanged;
                this.appWorkspace.ActiveDocumentWorkspace.DocumentChanged -= DocumentWorkspace_DocumentChanged;
                this.appWorkspace.ActiveDocumentWorkspace.SaveOptionsChanged -= DocumentWorkspace_SaveOptionsChanged;
            }
        }

        private void AppWorkspace_ActiveDocumentWorkspaceChanged(object sender, EventArgs e)
        {
            if (this.appWorkspace.ActiveDocumentWorkspace != null)
            {
                this.appWorkspace.ActiveDocumentWorkspace.ScaleFactorChanged += DocumentWorkspace_ScaleFactorChanged;
                this.appWorkspace.ActiveDocumentWorkspace.DocumentChanged += DocumentWorkspace_DocumentChanged;
                this.appWorkspace.ActiveDocumentWorkspace.SaveOptionsChanged += DocumentWorkspace_SaveOptionsChanged;
            }

            SetTitleText();
        }

        private void DocumentWorkspace_SaveOptionsChanged(object sender, EventArgs e)
        {
            SetTitleText();
        }

        private void FloaterOpacityTimer_Tick(object sender, System.EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized ||
                this.floaters == null ||
                !PdnBaseForm.EnableOpacity ||
                this.appWorkspace.ActiveDocumentWorkspace == null)
            {
                return;
            }

            // Here's the behavior we want for our floaters:
            // 1. If the mouse is within a floaters rectangle, it should transition to fully opaque
            // 2. If the mouse is outside the floater's rectangle, it should transition to partially
            //    opaque
            // 3. However, if the floater is outside where the document is visible on screen, it
            //    should always be fully opaque.
            Rectangle screenDocRect;

            try
            {
                screenDocRect = this.appWorkspace.ActiveDocumentWorkspace.VisibleDocumentBounds;
            }

            catch (ObjectDisposedException)
            {
                return; // do nothing, we are probably in the process of shutting down the app
            }

            for (int i = 0; i < floaters.Length; ++i)
            {
                FloatingToolForm ftf = floaters[i];

                Rectangle intersect = Rectangle.Intersect(screenDocRect, ftf.Bounds);
                double opacity = -1.0;

                try
                {
                    if (intersect.Width == 0 ||
                        intersect.Height == 0 ||
                        (ftf.Bounds.Contains(Control.MousePosition) &&
                            !appWorkspace.ActiveDocumentWorkspace.IsMouseCaptured()) ||
                        Utility.DoesControlHaveMouseCaptured(ftf))
                    {
                        opacity = Math.Min(1.0, ftf.Opacity + 0.125);
                    }
                    else
                    {
                        opacity = Math.Max(0.75, ftf.Opacity - 0.0625);
                    }

                    if (opacity != ftf.Opacity)
                    {
                        ftf.Opacity = opacity;
                    }
                }

                catch (System.ComponentModel.Win32Exception)
                {
                    // We just eat the exception. Chris Strahl was having some problem where opacity was 0.7
                    // and we were trying to set it to 0.7 and it said "the parameter is incorrect"
                    // ... which is stupid. Bad NVIDIA drivers for his GeForce Go?
                }
            }
        }

        protected override void OnLoad(EventArgs e)
        {
            EnsureFormIsOnScreen();

            if (killAfterInit)
            {
                Application.Exit();
            }


            this.floaters = new FloatingToolForm[] {
                                                       appWorkspace.Widgets.RuleListForm,
                                                       //appWorkspace.Widgets.PixelTrackingDialog,
                                                       //appWorkspace.Widgets.RunningDialog,
                                                       //appWorkspace.Widgets.HistogramDialog,
                                                       //appWorkspace.Widgets.ScratchTreatmentDialog,
                                                       //appWorkspace.Widgets.SmudgeTreatmentDialog,
                                                       //appWorkspace.Widgets.LabelListDialog,
                                                       //appWorkspace.Widgets.WorkFlowDialog,
                                                       //appWorkspace.Widgets.MeasureListDialog,
                                                       //appWorkspace.Widgets.OpticalDensityDialog,
                                                       //appWorkspace.Widgets.ProjectEngineering
                                                   };

            foreach (FloatingToolForm ftf in floaters)
            {
                ftf.Closing += this.HideInsteadOfCloseHandler;
            }

            PositionFloatingForms();

            base.OnLoad(e);
        }

        protected override void OnResize(EventArgs e)
        {
            if (floaterOpacityTimer != null)
            {
                if (WindowState == FormWindowState.Minimized)
                {
                    if (this.floaterOpacityTimer.Enabled)
                    {
                        this.floaterOpacityTimer.Enabled = false;
                    }
                }
                else
                {
                    if (!this.floaterOpacityTimer.Enabled)
                    {
                        this.floaterOpacityTimer.Enabled = true;
                    }

                    this.FloaterOpacityTimer_Tick(this, EventArgs.Empty);
                }
            }

            base.OnResize(e);
        }

        private void DocumentWorkspace_DocumentChanged(object sender, System.EventArgs e)
        {
            SetTitleText();
            OnResize(EventArgs.Empty);
        }

        private void SetTitleText()
        {
            if (this.appWorkspace == null)
            {
                return;
            }

            this.Text = PdnInfo.GetAppName();
        }

        private void OnMenuDropDownClosed(object sender, System.EventArgs e)
        {
            ToolStripMenuItem menu = (ToolStripMenuItem)sender;

            foreach (ToolStripItem tsi in menu.DropDownItems)
            {
                tsi.Enabled = true;
            }
        }

        private void HideInsteadOfCloseHandler(object sender, CancelEventArgs e)
        {
            e.Cancel = true;
            ((Form)sender).Hide();
        }

        protected override void OnDragEnter(DragEventArgs drgevent)
        {
            if (Enabled && drgevent.Data.GetDataPresent(DataFormats.FileDrop))
            {
                string[] files = (string[])drgevent.Data.GetData(DataFormats.FileDrop);

                foreach (string file in files)
                {
                    try
                    {
                        FileAttributes fa = System.IO.File.GetAttributes(file);

                        if ((fa & FileAttributes.Directory) == 0)
                        {
                            drgevent.Effect = DragDropEffects.Copy;
                        }
                    }

                    catch
                    {
                    }
                }
            }

            base.OnDragEnter(drgevent);
        }

        private string[] PruneDirectories(string[] fileNames)
        {
            List<string> result = new List<string>();

            foreach (string fileName in fileNames)
            {
                try
                {
                    FileAttributes fa = System.IO.File.GetAttributes(fileName);

                    if ((fa & FileAttributes.Directory) == 0)
                    {
                        result.Add(fileName);
                    }
                }

                catch
                {
                }
            }

            return result.ToArray();
        }

        protected override void OnDragDrop(DragEventArgs drgevent)
        {
            Activate();

            if (!IsCurrentModalForm || !Enabled)
            {
                // do nothing
            }
            else if (drgevent.Data.GetDataPresent(DataFormats.FileDrop))
            {
                string[] allFiles = (string[])drgevent.Data.GetData(DataFormats.FileDrop);

                if (allFiles == null)
                {
                    return;
                }

                string[] files = PruneDirectories(allFiles);
                if (files.Length == 0)
                {
                    return;
                }
                this.appWorkspace.OpenFilesInNewWorkspace(files);
            }

            base.OnDragDrop(drgevent);
        }

        private void DocumentWorkspace_ScaleFactorChanged(object sender, EventArgs e)
        {
            SetTitleText();
        }

        protected override void OnSizeChanged(EventArgs e)
        {
            base.OnSizeChanged(e);
            SetTitleText();
        }

        public void DeferredInitialization(object sender, EventArgs e)
        {
            this.deferredInitializationTimer.Enabled = false;
            this.deferredInitializationTimer.Tick -= new EventHandler(DeferredInitialization);
            this.deferredInitializationTimer.Dispose();
            this.deferredInitializationTimer = null;
        }

        /*protected override void OnHelpRequested(HelpEventArgs hevent)
        {
            // F1 is already handled by the Menu->Help menu item. No need to process it twice.
            hevent.Handled = true;

            base.OnHelpRequested(hevent);
        }*/
    }
}