using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System;
#if UNITY_EDITOR
using UnityEditor;
#endif

namespace MoreMountains.Tools
{
	[CustomPropertyDrawer(typeof(MMVectorAttribute))]
	public class MMVectorLabelsAttributeDrawer : PropertyDrawer
	{
		protected static readonly GUIContent[] originalLabels = new GUIContent[] { new GUIContent("X"), new GUIContent("Y"), new GUIContent("Z"), new GUIContent("W") };
		protected const int padding = 375;

		public override float GetPropertyHeight(SerializedProperty property, GUIContent guiContent)
		{
			int ratio = (padding > Screen.width) ? 2 : 1;
			return ratio * base.GetPropertyHeight(property, guiContent);
		}
        
		#if  UNITY_EDITOR
		public override void OnGUI(Rect rect, SerializedProperty property, GUIContent guiContent)
		{
			MMVectorAttribute vector = (MMVectorAttribute)attribute;
            
			if (property.propertyType == SerializedPropertyType.Vector2)
			{
				float[] fieldArray = new float[] { property.vector2Value.x, property.vector2Value.y };
				fieldArray = DrawFields(rect, fieldArray, ObjectNames.NicifyVariableName(property.name), EditorGUI.FloatField, vector, guiContent);
				property.vector2Value = new Vector2(fieldArray[0], fieldArray[1]);
			}
			else if (property.propertyType == SerializedPropertyType.Vector3)
			{
				float[] fieldArray = new float[] { property.vector3Value.x, property.vector3Value.y, property.vector3Value.z };
				fieldArray = DrawFields(rect, fieldArray, ObjectNames.NicifyVariableName(property.name), EditorGUI.FloatField, vector, guiContent);
				property.vector3Value = new Vector3(fieldArray[0], fieldArray[1], fieldArray[2]);
			}
			else if (property.propertyType == SerializedPropertyType.Vector4)
			{
				float[] fieldArray = new float[] { property.vector4Value.x, property.vector4Value.y, property.vector4Value.z, property.vector4Value.w };
				fieldArray = DrawFields(rect, fieldArray, ObjectNames.NicifyVariableName(property.name), EditorGUI.FloatField, vector, guiContent);
				property.vector4Value = new Vector4(fieldArray[0], fieldArray[1], fieldArray[2]);
			}
			else if (property.propertyType == SerializedPropertyType.Vector2Int)
			{
				int[] fieldArray = new int[] { property.vector2IntValue.x, property.vector2IntValue.y };
				fieldArray = DrawFields(rect, fieldArray, ObjectNames.NicifyVariableName(property.name), EditorGUI.IntField, vector, guiContent);
				property.vector2IntValue = new Vector2Int(fieldArray[0], fieldArray[1]);
			}
			else if (property.propertyType == SerializedPropertyType.Vector3Int)
			{
				int[] array = new int[] { property.vector3IntValue.x, property.vector3IntValue.y, property.vector3IntValue.z };
				array = DrawFields(rect, array, ObjectNames.NicifyVariableName(property.name), EditorGUI.IntField, vector, guiContent);
				property.vector3IntValue = new Vector3Int(array[0], array[1], array[2]);
			}
		}
		#endif

		protected T[] DrawFields<T>(Rect rect, T[] vector, string mainLabel, System.Func<Rect, GUIContent, T, T> fieldDrawer, MMVectorAttribute vectors, GUIContent originalGuiContent)
		{
			T[] result = vector;

			bool shortSpace = (Screen.width < padding);

			Rect mainLabelRect = rect;
			mainLabelRect.width = EditorGUIUtility.labelWidth;
			if (shortSpace)
			{
				mainLabelRect.height *= 0.5f;
			}                

			Rect fieldRect = rect;
			if (shortSpace)
			{
				fieldRect.height *= 0.5f;
				fieldRect.y += fieldRect.height;
				fieldRect.width = rect.width / vector.Length;
			}
			else
			{
				fieldRect.x += mainLabelRect.width;
				fieldRect.width = (rect.width - mainLabelRect.width) / vector.Length;
			}
			
			GUIContent mainLabelContent = new GUIContent();
			mainLabelContent.text = mainLabel;
			mainLabelContent.tooltip = originalGuiContent.tooltip;

			EditorGUI.LabelField(mainLabelRect, mainLabelContent);

			for (int i = 0; i < vector.Length; i++)
			{
				GUIContent label = vectors.Labels.Length > i ? new GUIContent(vectors.Labels[i]) : originalLabels[i];
				Vector2 labelSize = EditorStyles.label.CalcSize(label);
				EditorGUIUtility.labelWidth = Mathf.Max(labelSize.x + 5, 0.3f * fieldRect.width);
				result[i] = fieldDrawer(fieldRect, label, vector[i]);
				fieldRect.x += fieldRect.width;
			}

			EditorGUIUtility.labelWidth = 0;
			return result;
		}
	}
}