using UnityEditor;
using UnityEngine;
using System.Collections;
using System.Collections.Generic;

namespace Fungus
{

	[CustomEditor (typeof(SetVariable))]
	public class SetVariableEditor : CommandEditor 
	{
		protected SerializedProperty variableProp;
		protected SerializedProperty setOperatorProp;
		protected SerializedProperty booleanDataProp;
		protected SerializedProperty integerDataProp;
		protected SerializedProperty floatDataProp;
		protected SerializedProperty stringDataProp;

		protected virtual void OnEnable()
		{
			variableProp = serializedObject.FindProperty("variable");
			setOperatorProp = serializedObject.FindProperty("setOperator");
			booleanDataProp = serializedObject.FindProperty("booleanData");
			integerDataProp = serializedObject.FindProperty("integerData");
			floatDataProp = serializedObject.FindProperty("floatData");
			stringDataProp = serializedObject.FindProperty("stringData");
		}

		public override void DrawCommandGUI()
		{
			serializedObject.Update();

			SetVariable t = target as SetVariable;

			Flowchart flowchart = t.GetFlowchart();
			if (flowchart == null)
			{
				return;
			}

			EditorGUILayout.PropertyField(variableProp);

			if (variableProp.objectReferenceValue == null)
			{
				serializedObject.ApplyModifiedProperties();
				return;
			}

			Variable selectedVariable = variableProp.objectReferenceValue as Variable;
			System.Type variableType = selectedVariable.GetType();

			List<GUIContent> operatorsList = new List<GUIContent>();
			operatorsList.Add(new GUIContent("="));
			if (variableType == typeof(BooleanVariable))
			{
				operatorsList.Add(new GUIContent("=!"));
			}
			else if (variableType == typeof(IntegerVariable) ||
			         variableType == typeof(FloatVariable))
			{
				operatorsList.Add(new GUIContent("+="));
				operatorsList.Add(new GUIContent("-="));
				operatorsList.Add(new GUIContent("*="));
				operatorsList.Add(new GUIContent("/="));
			}
			
			int selectedIndex = 0;
			switch (t.setOperator)
			{
				default:
				case SetVariable.SetOperator.Assign:
					selectedIndex = 0;
					break;
				case SetVariable.SetOperator.Negate:
					selectedIndex = 1;
					break;
				case SetVariable.SetOperator.Add:
					selectedIndex = 1;
					break;
				case SetVariable.SetOperator.Subtract:
					selectedIndex = 2;
					break;
				case SetVariable.SetOperator.Multiply:
					selectedIndex = 3;
					break;
				case SetVariable.SetOperator.Divide:
					selectedIndex = 4;
					break;
			}

			selectedIndex = EditorGUILayout.Popup(new GUIContent("Operation", "Arithmetic operator to use"), selectedIndex, operatorsList.ToArray());
			
			SetVariable.SetOperator setOperator = SetVariable.SetOperator.Assign;
			if (variableType == typeof(BooleanVariable) || 
			    variableType == typeof(StringVariable))
			{
				switch (selectedIndex)
				{
				default:
				case 0:
					setOperator = SetVariable.SetOperator.Assign;
					break;
				case 1:
					setOperator = SetVariable.SetOperator.Negate;
					break;
				}
			} 
			else if (variableType == typeof(IntegerVariable) || 
			         variableType == typeof(FloatVariable))
			{
				switch (selectedIndex)
				{
				default:
				case 0:
					setOperator = SetVariable.SetOperator.Assign;
					break;
				case 1:
					setOperator = SetVariable.SetOperator.Add;
					break;
				case 2:
					setOperator = SetVariable.SetOperator.Subtract;
					break;
				case 3:
					setOperator = SetVariable.SetOperator.Multiply;
					break;
				case 4:
					setOperator = SetVariable.SetOperator.Divide;
					break;
				}
			}

			setOperatorProp.enumValueIndex = (int)setOperator;

			if (variableType == typeof(BooleanVariable))
			{
				EditorGUILayout.PropertyField(booleanDataProp, new GUIContent("Boolean"));
			}
			else if (variableType == typeof(IntegerVariable))
			{
				EditorGUILayout.PropertyField(integerDataProp, new GUIContent("Integer"));
			}
			else if (variableType == typeof(FloatVariable))
			{
				EditorGUILayout.PropertyField(floatDataProp, new GUIContent("Float"));
			}
			else if (variableType == typeof(StringVariable))
			{
				EditorGUILayout.PropertyField(stringDataProp, new GUIContent("String"));
			}

			serializedObject.ApplyModifiedProperties();
		}
	}

}