using UnityEngine;
using System.Collections.Generic;

//-----------------------------------------------------------------------------
// Copyright 2014-2020 RenderHeads Ltd.  All rights reserved.
//-----------------------------------------------------------------------------

namespace RenderHeads.Media.AVProDeckLink
{
	public class DeviceExplorerManager : PrefabSingleton<DeviceExplorerManager>
	{
		private List<DeckLink> _components;
		private DeckLink _currDeckLink = null;
		private Vector2 _lastScrollPos = Vector2.zero;
		Vector3 _lastMousePos = Vector3.zero;
		public GUISkin _skin;
		public float _showMaxButtonTime = 3f;
		public float _maxButtonTime = 0f;
		public bool _showExplorer = true;
		public int _depth = 1;

		[Range(1f, 10f)]
		public float _showSensitivity = 1f;

		void Awake()
		{
			_components = new List<DeckLink>();
		}

		void OnGUI()
		{
			if (_components.Count == 0)
			{
				return;
			}

			int prevDepth = GUI.depth;
			GUI.depth = _depth;

			GUISkin prevSkin = GUI.skin;
			GUI.skin = _skin;

			if (_showExplorer)
			{
				GUILayout.BeginHorizontal();

				GUILayout.BeginVertical("box", GUILayout.MinWidth(250), GUILayout.MaxHeight(150));

				if(GUILayout.Button("Select DeckLink Object"))
				{
					_currDeckLink = null;
				}

				_lastScrollPos = GUILayout.BeginScrollView(_lastScrollPos);

				foreach (DeckLink component in _components)
				{
					if(component == _currDeckLink)
					{
						GUI.color = Color.green;
					}

					if (GUILayout.Button(component.gameObject.name))
					{
						_currDeckLink = component;
					}

					GUI.color = Color.white;
				}

				GUILayout.EndScrollView();

				GUILayout.EndVertical();

				if(_currDeckLink != null)
				{
					_currDeckLink.RenderExplorer();
				}

				if (GUILayout.Button("x", GUILayout.MaxWidth(20)))
				{
					_showExplorer = false;
					_maxButtonTime = 0f;
				}

				GUILayout.EndHorizontal();
			}
			else
			{
				if(_maxButtonTime < _showMaxButtonTime)
				{
					if (GUILayout.Button("Explorer", GUILayout.Width(100)))
					{
						_showExplorer = true;
					}
				}
			}
			GUI.skin = prevSkin;
			GUI.depth = prevDepth;
		}

		public void RegisterExplorer(DeckLink deckLink)
		{
			if (_components.Contains(deckLink))
			{
				return;
			}

			_components.Add(deckLink);

			if (_components.Count > 0)
			{
				this.enabled = true;
			}            
		}

		public void UnregisterExplorer(DeckLink deckLink)
		{
			_components.Remove(deckLink);
			if(_currDeckLink == deckLink)
			{
				_currDeckLink = null;
			}

			if (_components.Count <= 0)
			{
				this.enabled = false;
			}            
		}

		void Update()
		{
			Vector3 diff = Input.mousePosition - _lastMousePos;
			_lastMousePos = Input.mousePosition;

			float threshold = 1 / (_showSensitivity * _showSensitivity ) * 100f;

			if(diff.magnitude > threshold)
			{
				_maxButtonTime = 0f;
			}
			else
			{
				_maxButtonTime += Time.unscaledDeltaTime;
			}

			if (_components.Count <= 0)
			{
				this.enabled = false;
			}
		}
	}

}