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 System.Windows.Media.Animation;
using BuzzGUI.Interfaces;
using BuzzGUI.Common;

namespace BuzzGUI.MachineView
{
	/// <summary>
	/// Interaction logic for AmpControl.xaml
	/// </summary>
	public partial class AmpControl : UserControl
	{
		Connection connection;
		IMachineConnection machineConnection;
		const double MinAmp = 66;
		const int PanRight = 0x8000;
		const int PanCenter = 0x4000;
		int oldamp, oldpan;
		int newamp, newpan;

		public AmpControl(ResourceDictionary rd)
		{
			if (rd != null) this.Resources.MergedDictionaries.Add(rd);

			InitializeComponent();

			this.MouseLeave += (sender, e) =>
			{
				Deactivate();
			};

			this.PreviewMouseDoubleClick += (sender, e) => { e.Handled = true; };
			this.MouseRightButtonUp += (sender, e) => { e.Handled = true; };
			this.MouseDown += (sender, e) => 
			{
				if (e.ChangedButton == MouseButton.Middle)
				{
					connection.Disconnect();
					Visibility = Visibility.Collapsed;
				}
				else
				{
					e.Handled = true;
				}
			};

			ampKnob.ValueChanged += (sender, e) =>
			{
				newamp = ampKnob.Value == 0 ? 0 : (int)Math.Round(Decibel.ToAmplitude(ampKnob.Value * (MinAmp + Decibel.FromAmplitude((double)0xfffe / 0x4000)) - MinAmp) * 0x4000);
				machineConnection.Amp = newamp;
				UpdateAmpText();
			};

			panKnob.ValueChanged += (sender, e) =>
			{
				newpan = (int)Math.Round(panKnob.Value + PanCenter);
				machineConnection.Pan = newpan;
				UpdatePanText();
			};

			disconnectButton.Click += (sender, e) =>
			{
				connection.Disconnect();
				Visibility = Visibility.Collapsed;
			};

			insertButton.Click += (sender, e) =>
			{
				connection.Insert();
				Visibility = Visibility.Collapsed;
			};

		}

		void UpdateAmpText()
		{
			int v = machineConnection.Amp;
			ampTextBlock.Text = v > 0 ? string.Format("{0:F1}dB", Decibel.FromAmplitude(v * (1.0 / 0x4000))) : "-inf.dB";
		}

		void UpdatePanText()
		{
			int v = machineConnection.Pan;
			if (v == 0) panTextBlock.Text = "L";
			else if (v == PanCenter) panTextBlock.Text = "C";
			else if (v == PanRight) panTextBlock.Text = "R";
			else if (v < PanCenter) panTextBlock.Text = string.Format("{0:F0}L", (PanCenter - v) * (100.0 / PanCenter));
			else if (v > PanCenter) panTextBlock.Text = string.Format("{0:F0}R", (v - PanCenter) * (100.0 / PanCenter));
		}

		void SetAmpKnobValue()
		{
			newamp = oldamp = machineConnection.Amp;
			double v = oldamp;
			if (v <= 0)
				ampKnob.Value = 0;
			else if (v >= 0xfffe)
				ampKnob.Value = 1.0;
			else
				ampKnob.Value = Math.Min(1, (Decibel.FromAmplitude(v / 0x4000) + MinAmp) / (MinAmp + Decibel.FromAmplitude((double)0xfffe / 0x4000)));
			
			UpdateAmpText();
		}

		void SetPanKnobValue()
		{
			newpan = oldpan = machineConnection.Pan;
			panKnob.Value = (double)oldpan - PanCenter;
			UpdatePanText();
		}
		
		public void Activate(Connection conn, Point p, MouseButtonEventArgs mbea)
		{
			if (conn == connection && Visibility == Visibility.Visible)
				return;

			connection = conn;
			machineConnection = conn.MachineConnection;

			var mv = this.GetAncestor<MachineView>();

			Canvas.SetLeft(this, p.X - 16);
			Canvas.SetTop(this, p.Y - 16);

			panKnob.Visibility = machineConnection.HasPan ? Visibility.Visible : Visibility.Collapsed;
			panViewbox.Visibility = machineConnection.HasPan ? Visibility.Visible : Visibility.Collapsed;
			grid.RowDefinitions[1].Height = new GridLength(machineConnection.HasPan ? 4.0 : 0.0);

			SetAmpKnobValue();
			if (machineConnection.HasPan) SetPanKnobValue();

			Visibility = Visibility.Visible;

			if (mbea != null)
				ampKnob.BeginDrag(mbea);
		}

		void Deactivate()
		{
			Visibility = Visibility.Collapsed;

			if (newamp != oldamp) connection.MachineGraph.SetConnectionParameter(machineConnection, 0, oldamp, newamp);
			if (newpan != oldpan) connection.MachineGraph.SetConnectionParameter(machineConnection, 1, oldpan, newpan);
		}
	}
}