using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using DevComponents.DotNetBar.Keyboard;
using POSV.MessageEvent;

namespace POSV
{
    public partial class SimpleKeyboard : BusinessForm
    {
        private readonly int defaultWidth;

        private readonly int diffWidth;

        private readonly bool allowShowSearchBox;

        private readonly Action<string> action;

        private SimpleKeyboard(Point location ,Size size,bool showSearchBox = false, Action<string> action = null)
        {
            InitializeComponent();

            this.Name = "SimpleKeyboard";

            this.allowShowSearchBox = showSearchBox;

            this.action = action;

            this.txtSearch.Multiline = false;

            this.topPanel.Visible = this.allowShowSearchBox;

            this.WindowState = FormWindowState.Normal;

            this.StartPosition = FormStartPosition.Manual;
            
            if (location != null && !location.IsEmpty)
            {
                this.Location = new Point(location.X,location.Y);
            }

            if (size != null && !size.IsEmpty)
            {
                this.Size = new Size(size.Width,size.Height);
            }

            this.defaultWidth = this.Width / 10;

            this.diffWidth = (this.Width - this.defaultWidth * 10);
            
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            if (this.DesignMode) return;

            this.keyboardControl.Renderer = new SearchRenderer();

            this.keyboardControl.Keyboard = CreateDefaultKeyboard();
        }

        public static void ShowKeyboard(IWin32Window owner , Point location , Size size , bool showSearchBox = false, Action<string> action = null)
        {
            var form = Application.OpenForms["SimpleKeyboard"];
            if(form == null)
            {
                form = new SimpleKeyboard(location , size , showSearchBox , action);
                form.Show(owner);
            }
        }

        public static bool Showing()
        {
            var form = Application.OpenForms["SimpleKeyboard"];

            return form != null;
        }

        public static void CloseKeyboard()
        {
            var form = Application.OpenForms["SimpleKeyboard"];
            if (form != null)
            {
                form.Close();
            }
        }


        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            e.Cancel = false;
        }


        #region Window activation handling

        private const int WM_MOUSEACTIVATE = 0x0021;
        private const int MA_NOACTIVATE = 0x0003;
        private const int WS_EX_NOACTIVATE = 0x08000000;

        protected override CreateParams CreateParams
        {
            get
            {
                if (this.allowShowSearchBox)
                {
                    return base.CreateParams;
                }
                else
                {
                    CreateParams createParams = base.CreateParams;
                    createParams.ExStyle = createParams.ExStyle & WS_EX_NOACTIVATE;
                    return createParams;
                }

            }
        }
        

        protected override void WndProc(ref Message m)
        {
            // This prevents the window from being activated with the mouse, 
            // but allows the window to be resized (with the mouse).
            if (m.Msg == WM_MOUSEACTIVATE)
            {
                m.Result = (IntPtr)MA_NOACTIVATE;
            }
            else
            {
                base.WndProc(ref m);
            }
        }
        
        protected override void OnActivated(EventArgs e)
        {
            if (!this.allowShowSearchBox)
            {
                Owner.Activate();
            }
            else
            {
                this.Activate();
            }
        }

        #endregion

        private Keyboard CreateDefaultKeyboard()
        {
            Keyboard keyboard = new Keyboard();

            LinearKeyboardLayout layout = new LinearKeyboardLayout();

            layout.AddKey("1" , width: defaultWidth);
            layout.AddKey("2" , width: defaultWidth);
            layout.AddKey("3" , width: defaultWidth);
            layout.AddKey("4" , width: defaultWidth);
            layout.AddKey("5" , width: defaultWidth);
            layout.AddKey("6" , width: defaultWidth);
            layout.AddKey("7" , width: defaultWidth);
            layout.AddKey("8" , width: defaultWidth);
            layout.AddKey("9" , width: defaultWidth);
            layout.AddKey("0" , width: defaultWidth + diffWidth);

            layout.AddLine();

            layout.AddKey("Q" , width: defaultWidth);
            layout.AddKey("W" , width: defaultWidth);
            layout.AddKey("E" , width: defaultWidth);
            layout.AddKey("R" , width: defaultWidth);
            layout.AddKey("T" , width: defaultWidth);
            layout.AddKey("Y" , width: defaultWidth);
            layout.AddKey("U" , width: defaultWidth);
            layout.AddKey("I" , width: defaultWidth);
            layout.AddKey("O" , width: defaultWidth);
            layout.AddKey("P" , width: defaultWidth + diffWidth);

            layout.AddLine();

            layout.AddKey("A" , width: defaultWidth);
            layout.AddKey("S" , width: defaultWidth);
            layout.AddKey("D" , width: defaultWidth);
            layout.AddKey("F" , width: defaultWidth);
            layout.AddKey("G" , width: defaultWidth);
            layout.AddKey("H" , width: defaultWidth);
            layout.AddKey("J" , width: defaultWidth);
            layout.AddKey("K" , width: defaultWidth);
            layout.AddKey("L" , width: defaultWidth);

            layout.AddKey("回车" , info: "{ENTER}" , width: defaultWidth + diffWidth , height: 21);

           

            layout.AddLine();

            layout.AddKey("Z" , width: defaultWidth);
            layout.AddKey("X" , width: defaultWidth);
            layout.AddKey("C" , width: defaultWidth);
            layout.AddKey("V" , width: defaultWidth);
            layout.AddKey("B" , width: defaultWidth);
            layout.AddKey("N" , width: defaultWidth);
            layout.AddKey("M" , width: defaultWidth);
            layout.AddKey("退格" , info: "{BACKSPACE}" , width: defaultWidth * 2);

            keyboard.Layouts.Add(layout);

            return keyboard;
        }

        private void OnSearchTextChanged(object sender , EventArgs e)
        {
            if(this.allowShowSearchBox && this.action != null)
            {
                this.action(this.txtSearch.Text.Trim());
            }
        }

        protected override bool ProcessCmdKey(ref Message msg , Keys keyData)
        {
            switch (keyData)
            {
                case Keys.Escape:
                    {
                        this.Close();
                    }
                    break;
                case Keys.Right:
                    {
                        MsgEvent.Send(Constant.PRODUCT_KEYBOARD_NOTIFY , KeyboardAction.Right);
                    }
                    break;
                case Keys.Left:
                    {
                        MsgEvent.Send(Constant.PRODUCT_KEYBOARD_NOTIFY , KeyboardAction.Left);
                    }
                    break;
                case Keys.Up:
                    {
                        MsgEvent.Send(Constant.PRODUCT_KEYBOARD_NOTIFY , KeyboardAction.Up);
                    }
                    break;
                case Keys.Down:
                    {
                        MsgEvent.Send(Constant.PRODUCT_KEYBOARD_NOTIFY , KeyboardAction.Down);
                    }
                    break;
                case Keys.Enter:
                    {
                        
                    }
                    break;
            }

            return base.ProcessCmdKey(ref msg , keyData);
        }

        private void OnSendingKey(object sender, KeyboardKeyCancelEventArgs e)
        {
            this.txtSearch.Focus();
        }

        private void OnSearchEnterClick(object sender , Component.EnterEventArg e)
        {
            this.action("Enter");
            this.txtSearch.Text = string.Empty;
            this.txtSearch.Focus();
        }
    }

    public class SearchRenderer : Renderer
    {
        private Font _font = new Font("宋体" , 15 , FontStyle.Bold);
        private StringFormat _format;

        public SearchRenderer()
        {
            _format = (StringFormat)StringFormat.GenericDefault.Clone();
            _format.LineAlignment = StringAlignment.Center;
            _format.Alignment = StringAlignment.Center;
        }


        public override void DrawBackground(BackgroundRendererEventArgs args)
        {
            using (var brush = new SolidBrush(Color.White))
            {
                args.Graphics.FillRectangle(brush , args.Bounds);
            }
        }

        public override void DrawCloseButton(CloseButtonRendererEventArgs args)
        {
            
        }

        public override void DrawKey(KeyRendererEventArgs args)
        {
            Rectangle keyBounds = args.Bounds;

            if (args.IsDown || args.Key.Style == KeyStyle.Pressed)
            {
                using (var brush = new SolidBrush(Color.Moccasin))
                {
                    args.Graphics.FillRectangle(brush , keyBounds);
                }

                using (var brush = new SolidBrush(Color.Black))
                {
                    args.Graphics.DrawString(args.Key.Caption , _font , brush , keyBounds , _format);
                }
            }
            else
            {
                using (var brush = new SolidBrush(Color.Tan))
                {
                    args.Graphics.FillRectangle(brush , keyBounds);
                }

                using (var brush = new SolidBrush(Color.Black))
                {

                    args.Graphics.DrawString(args.Key.Caption , _font , brush , keyBounds , _format);
                }
            }


            
        }

        public override void DrawTopBar(TopBarRendererEventArgs args)
        {
            args.Graphics.DrawString(args.Text , _font , ColorTable.TopBarTextBrush , args.Bounds);
        }
    }
}