using System;
using System.Drawing;
using System.Windows.Forms;
using DevComponents.DotNetBar.Keyboard;

namespace POSV
{
    public partial class NumericKeyboard : BusinessForm
    {
        private readonly System.Timers.Timer _timer = null;

        private NumericKeyboard()
        { 
            InitializeComponent();

            this.Name = "NumericKeyboard";

            this._timer = new System.Timers.Timer();
            this._timer.Interval = 100;
            this._timer.Elapsed += OnElapsed;
        }

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

            if (this.DesignMode) return;

            this.WindowState = FormWindowState.Normal;

            this.StartPosition = FormStartPosition.Manual;

            this.keyboardControl.Renderer = new ThreeDRenderer();

            this.keyboardControl.Keyboard = CreateNumericKeyboard();

            this.Activate();
        }

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

            LinearKeyboardLayout layout = new LinearKeyboardLayout();

            layout.AddKey("7");
            layout.AddKey("8");
            layout.AddKey("9");
            //layout.AddKey("+" , "{ADD}" , height: 21);
            layout.AddKey("删除" , "{BACKSPACE}" , height: 21);
            layout.AddLine();

            layout.AddKey("4");
            layout.AddKey("5");
            layout.AddKey("6");
            layout.AddLine();

            layout.AddKey("1");
            layout.AddKey("2");
            layout.AddKey("3");
            layout.AddKey("确定" , "{ENTER}" , height: 21);
            layout.AddLine();

            layout.AddKey("0" , width: 21);
            layout.AddKey(".");

            keyboard.Layouts.Add(layout);

            return keyboard;
        }

        #region Window activation handling

        private const int WM_MOUSEACTIVATE = 0x0021;
        private const int MA_NOACTIVATE = 0x0003;
        private const int WS_EX_NOACTIVATE = 0x08000000;
        // Override CreateParams to specify that this Form should not be activated.
        protected override CreateParams CreateParams
        {
            get
            {
                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)
        {
            Owner.Activate();
        }

        #endregion

        private void StartTimer()
        {
            this._timer.Start();
        }

        private void OnElapsed(object sender , System.Timers.ElapsedEventArgs e)
        {
            this.Invoke(new Action(() => {
                if (!this.Bounds.Contains(Control.MousePosition) && Control.MouseButtons == MouseButtons.Left)
                {
                    var form = Application.OpenForms["NumericKeyboard"];
                    if(form != null)
                    {
                        ((NumericKeyboard)form).StopTimer();

                        form.Close();
                    }
                }
            }));
        }
        
        private void StopTimer()
        {
            if (this._timer != null)
            {
                this._timer.Stop();
            }
        }

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

                form.Close();
            }
        }

        /// <summary>
        /// 计算键盘显示坐标
        /// </summary>
        /// <param name="targetPoint"></param>
        /// <param name="targetWidth"></param>
        /// <returns></returns>
        public static Point CalculateLocation(Point targetPoint, int targetWidth)
        {
            Point p = Point.Empty;
            p.X = targetPoint.X + targetWidth + 5;
            p.Y = targetPoint.Y;

            if (p.Y + 250 > Screen.PrimaryScreen.Bounds.Height)
            {
                p.Y -= 250;
            }
            return p;
        }

        public static void ShowKeyboard(IWin32Window owner, Control control)
        {
            ShowKeyboard(owner, control, Point.Empty);
        }

        public static void ShowKeyboard(IWin32Window owner, Point point)
        {
            ShowKeyboard(owner, null, point);
        }

        public static void ShowKeyboard(IWin32Window owner, Control control, Point point)
        {
            try
            {
                var form = Application.OpenForms["NumericKeyboard"];
                if(form == null)
                {
                    form = new NumericKeyboard();
                }

                if (control != null)
                {
                    Point location = control.PointToScreen(Point.Empty);
                    location.Offset(0 , control.Height + 1);
                    form.Location = location;
                }
                else
                {
                    form.Location = point;
                }

                ((NumericKeyboard)form).StartTimer();

                form.Show(owner);
            }
            catch
            {
                var form = Application.OpenForms["NumericKeyboard"];
                if (form != null)
                {
                    ((NumericKeyboard)form).StopTimer();

                    form.Close();
                }
            }
            
        }
    }
}