using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using BuzzGUI.Interfaces;
using BuzzGUI.Common;

namespace BuzzGUI.WaveformControl
{
	public partial class WaveformControl : UserControl
	{
        public ICommand ZoomInCommand { get; set; }

		public WaveformControl()
		{
			InitializeComponent();

			int mouseWheelAcc = 0;

            this.PreviewMouseWheel += (sender, e) =>
			{
                if (waveformElement.Waveform != null)
				{
					mouseWheelAcc += e.Delta;

					while (mouseWheelAcc > 120)
					{
						mouseWheelAcc -= 120;
						waveformElement.AdjustZoom(false);
					}

					while (mouseWheelAcc < 120)
					{
						mouseWheelAcc += 120;
						waveformElement.AdjustZoom(true);
					}

				}

			};
    
            DataContextChanged += new DependencyPropertyChangedEventHandler(OnDataContextChanged);

            NameScope.SetNameScope(contextMenu, NameScope.GetNameScope(this));

            ZoomInCommand = new SimpleCommand()
            {
                CanExecuteDelegate = (x) => true,
                ExecuteDelegate = (x) =>
                    {
                        waveformElement.AdjustZoom(true);
                    }
            };

            waveformElement.SelectionChanged += new WaveformElement.ChangedEventHandler((t, e) =>  {});
            waveformElement.PropertyChanged += waveformElement_PropertyChanged;
		}

        void waveformElement_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "CursorOffset")
            {
                double ScreenOffset = (waveformElement.PlayCursor.Offset - waveformElement.ScrollOffset.X) % waveformElement.ActualWidth;

                if (ScreenOffset < 0)
                {
                    Canvas.SetLeft(TimelineCursor, 0.0);
                }
                else
                {
                    if (waveformElement.PlayCursor.Offset - waveformElement.ActualWidth > waveformElement.ScrollOffset.X)
                    {
                        Canvas.SetLeft(TimelineCursor, waveformElement.ActualWidth);
                    }
                    else
                    {
                        Canvas.SetLeft(TimelineCursor, Math.Floor(ScreenOffset));
                    }
                }

                //BuzzGUI.Common.Global.Buzz.DCWriteLine("screen:" + ScreenOffset.ToString());
                //BuzzGUI.Common.Global.Buzz.DCWriteLine("cursor:" + waveformElement.PlayCursor.Offset.ToString());
                //BuzzGUI.Common.Global.Buzz.DCWriteLine("scroll:" + waveformElement.ScrollOffset.X.ToString());
            }
        }

        private void Canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            Point p = Mouse.GetPosition(Timeline);
            waveformElement.PlayCursor.OffsetSamples = waveformElement.PositionToSample(p.X);
        }

        void OnDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
        {
            var x = (WaveformControl)sender;
            var oldVM = e.OldValue as WaveformVM;
            var newVM = e.NewValue as WaveformVM;

            BuzzGUI.Common.Global.Buzz.DCWriteLine("OnDataContextChanged");
            // You can also validate the data going into the DataContext using the event args
        }
	}
}