using UnityEngine;
using System.Collections.Generic;
using Lean.Common;

namespace Lean.Touch
{
	/// <summary>This class manages a list of fingers, and can return a filtered version of them based on the criteria you specify. This allows you to quickly implement complex controls involving multiple fingers.
	/// By default, all fingers seen by LeanTouch are used by this class, but you can set <b>Filter</b> to <b>ManuallyAddedFingers</b>, and you can manually call the <b>AddFinger</b> method to add them yourself.
	/// NOTE: If you use this class then you must call the <b>UpdateAndGetFingers</b> method every frame/Update to update the class state. This is required because this update method will remove fingers that went up. If you don't call this then they will remain, and this may lead to unexpected behavior.</summary>
	[System.Serializable]
	public class LeanFingerFilter
	{
		public enum FilterType
		{
			AllFingers,
			ManuallyAddedFingers
		}

		/// <summary>The method used to find fingers to use with this component.
		/// ManuallyAddedFingers = You must manually call the AddFinger function (e.g. from a UI button).</summary>
		public FilterType Filter;

		/// <summary>Ignore fingers that began touching the screen on top of a GUI element?</summary>
		public bool IgnoreStartedOverGui;

		/// <summary>If the amount of fingers doesn't match this number, ignore all fingers?
		/// 0 = Any amount.</summary>
		public int RequiredFingerCount;

		/// <summary>When using simulated fingers, should a specific combination of mouse buttons be held?
		/// 0 = Any.
		/// 1 = Left.
		/// 2 = Right.
		/// 3 = Left + Right.
		/// 4 = Middle.
		/// 5 = Left + Middle.
		/// 6 = Right + Middle.
		/// 7 = Left + Right + Middle.</summary>
		public int RequiredMouseButtons;

		/// <summary>If the specified RequiredSelectable component's IsSelected setting is false, ignore all fingers?</summary>
		public LeanSelectable RequiredSelectable;

		[System.NonSerialized]
		private List<LeanFinger> fingers;

		[System.NonSerialized]
		private List<LeanFinger> filteredFingers;

		public LeanFingerFilter(bool newIgnoreStartedOverGui) : this(default(FilterType), newIgnoreStartedOverGui, default(int), default(int), default(LeanSelectable))
		{
		}

		public LeanFingerFilter(FilterType newFilter, bool newIgnoreStartedOverGui, int newRequiredFingerCount, int newRequiredMouseButtons, LeanSelectable newRequiredSelectable)
		{
			Filter               = newFilter;
			IgnoreStartedOverGui = newIgnoreStartedOverGui;
			RequiredFingerCount  = newRequiredFingerCount;
			RequiredSelectable   = newRequiredSelectable;
			RequiredMouseButtons = newRequiredMouseButtons;

			fingers         = null;
			filteredFingers = null;
		}

		/// <summary>If the current RequiredSelectable is null, this method allows you to try and set it based on the specified GameObject.</summary>
		public void UpdateRequiredSelectable(GameObject gameObject)
		{
			if (RequiredSelectable == null && gameObject != null)
			{
				RequiredSelectable = gameObject.GetComponentInParent<LeanSelectable>();
			}
		}

		/// <summary>If you've set Filter to ManuallyAddedFingers, then you can call this method to manually add a finger.</summary>
		public void AddFinger(LeanFinger finger)
		{
			if (Filter == FilterType.ManuallyAddedFingers && finger != null)
			{
				if (fingers == null)
				{
					fingers = new List<LeanFinger>();
				}
				else
				{
					for (var i = fingers.Count - 1; i >= 0; i--)
					{
						if (fingers[i] == finger)
						{
							return;
						}
					}
				}

				fingers.Add(finger);
			}
		}

		/// <summary>If you've set Filter to ManuallyAddedFingers, then you can call this method to manually remove a finger.</summary>
		public void RemoveFinger(LeanFinger finger)
		{
			if (fingers != null)
			{
				for (var i = fingers.Count - 1; i >= 0; i--)
				{
					if (fingers[i] == finger)
					{
						fingers.RemoveAt(i);

						return;
					}
				}
			}
		}

		/// <summary>If you've set Filter to ManuallyAddedFingers, then you can call this method to manually remove all fingers.</summary>
		public void RemoveAllFingers()
		{
			if (fingers != null)
			{
				for (var i = fingers.Count - 1; i >= 0; i--)
				{
					RemoveFinger(fingers[i]);
				}
			}
		}

		/// <summary>This method returns a list of all fingers based on the current settings.
		/// NOTE: This method must be called every frame/Update.</summary>
		public List<LeanFinger> UpdateAndGetFingers(bool ignoreUpFingers = false)
		{
			if (filteredFingers == null)
			{
				filteredFingers = new List<LeanFinger>();
			}

			filteredFingers.Clear();

			if (Filter == FilterType.AllFingers)
			{
				filteredFingers.AddRange(LeanSelectableByFinger.GetFingers(IgnoreStartedOverGui, false, 0, RequiredSelectable));
			}
			else if (fingers != null)
			{
				filteredFingers.AddRange(fingers);

				for (var i = fingers.Count - 1; i >= 0; i--)
				{
					if (fingers[i].Up == true)
					{
						fingers.RemoveAt(i);
					}
				}
			}

			if (ignoreUpFingers == true)
			{
				for (var i = filteredFingers.Count - 1; i >= 0; i--)
				{
					if (filteredFingers[i].Up == true)
					{
						filteredFingers.RemoveAt(i);
					}
				}
			}

			if (RequiredMouseButtons > 0 && SimulatedFingersExist(filteredFingers) == true)
			{
				for (var i = 0; i < 5; i++)
				{
					var mask = 1 << i;

					if ((RequiredMouseButtons & mask) != 0 && LeanInput.GetMousePressed(i) == false && LeanInput.GetMouseUp(i) == false)
					{
						filteredFingers.Clear();
					}
				}

				return filteredFingers;
			}

			if (RequiredFingerCount > 0 && filteredFingers.Count != RequiredFingerCount)
			{
				filteredFingers.Clear();
			}

			return filteredFingers;
		}

		private static bool SimulatedFingersExist(List<LeanFinger> fingers)
		{
			foreach (var finger in fingers)
			{
				if (finger.Index < 0)
				{
					return true;
				}
			}

			return false;
		}
	}
}

#if UNITY_EDITOR
namespace Lean.Touch.Editor
{
	using UnityEditor;

	[CustomPropertyDrawer(typeof(LeanFingerFilter))]
	public class LeanFingerFilter_Drawer : PropertyDrawer
	{
		public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
		{
			var filter = (LeanFingerFilter.FilterType)property.FindPropertyRelative("Filter").enumValueIndex;
			var height = base.GetPropertyHeight(property, label);
			var step   = height + 2;

			switch (filter)
			{
				case LeanFingerFilter.FilterType.AllFingers: height += step * 4; break;
			}

			return height;
		}

		public override void OnGUI(Rect rect, SerializedProperty property, GUIContent label)
		{
			var filter = (LeanFingerFilter.FilterType)property.FindPropertyRelative("Filter").enumValueIndex;
			var height = base.GetPropertyHeight(property, label);

			rect.height = height;

			DrawProperty(ref rect, property, label, "Filter", label.text, "The method used to find fingers to use with this component.\n\nManuallyAddedFingers = You must manually call the AddFinger function (e.g. from a UI button).");

			EditorGUI.indentLevel++;
			{
				switch (filter)
				{
					case LeanFingerFilter.FilterType.AllFingers:
					{
						DrawProperty(ref rect, property, label, "RequiredSelectable", null, "If the specified RequiredSelectable component's IsSelected setting is false, ignore all fingers?");
						DrawProperty(ref rect, property, label, "RequiredFingerCount", null, "If the amount of fingers doesn't match this number, ignore all fingers?\n\n0 = Any amount.");
						DrawProperty(ref rect, property, label, "RequiredMouseButtons", null, "When using simulated fingers, should a specific combination of mouse buttons be held?\n\n0 = Any.\n1 = Left.\n2 = Right.\n3 = Left + Right.\n4 = Middle.\n5 = Left + Middle.\n6 = Right + Middle.\n7 = Left + Right + Middle.");
						DrawProperty(ref rect, property, label, "IgnoreStartedOverGui", null, "Ignore fingers that began touching the screen on top of a GUI element?");
					}
					break;
				}
			}
			EditorGUI.indentLevel--;
		}

		private void DrawProperty(ref Rect rect, SerializedProperty property, GUIContent label, string childName, string overrideName = null, string overrideTooltip = null)
		{
			var childProperty = property.FindPropertyRelative(childName);

			label.text = string.IsNullOrEmpty(overrideName) == false ? overrideName : childProperty.displayName;

			label.tooltip = string.IsNullOrEmpty(overrideTooltip) == false ? overrideTooltip : childProperty.tooltip;

			EditorGUI.PropertyField(rect, childProperty, label);

			rect.y += rect.height + 2;
		}
	}
}
#endif