using UnityEngine;
using UnityEditor;
using UnityEngine.UI;
using System.Collections;

public class LevelEditor : EditorWindow
{
	string myString = "Hello World";
	bool groupEnabled;
	bool myBool = true;
	float myFloat = 1.23f;
	public int pixelsToUnits = 8;

	
	// Add menu item named "My Window" to the Window menu
	[MenuItem("Window/LevelEditor")]
	public static void ShowWindow()
	{
		//Show existing window instance. If one doesn't exist, make one.
		EditorWindow.GetWindow(typeof(LevelEditor));
        
	}

	public static LevelEditor GetEditor(){
		return (LevelEditor)EditorWindow.GetWindow(typeof(LevelEditor), false);
	}

	[MenuItem ("LevelEditor/Aling position %g")]
	public static void AlignStatic(){
		var editor = GetEditor();
		editor.AlignPositionToGrid();
	}

	float AlingToGrid(float value, float gridStep){
		float div = value / gridStep;
		int cellId = Mathf.FloorToInt (div);
		float frac = div - (float)cellId;
		return (float)cellId * gridStep + (Mathf.Abs(frac) > 0.5f ? gridStep : 0.0f);
	}

	Vector3 AlingToGrid(Vector3 value, float gridStep){
		return new Vector3 (
			AlingToGrid(value.x, gridStep),
			AlingToGrid(value.y, gridStep),
			value.z);
			//AlingToGrid(value.z, gridStep));
	}

	void AlignPositionToGrid(){
		float gridStep = 1.0f / pixelsToUnits;
		foreach(var obj in Selection.objects){
			GameObject go = obj as GameObject;
			if(go != null){
				go.transform.position = AlingToGrid(go.transform.position, gridStep);
			}
		}
	}
	
	void OnGUI()
	{
		pixelsToUnits = EditorGUILayout.IntField("PixelsToUnits", pixelsToUnits);

		GUILayout.Label ("Blocks alignment", EditorStyles.boldLabel);
		if (GUILayout.Button ("Aling position to grid")) {
			AlignPositionToGrid();
		}

		if (GUILayout.Button ("Aling rotation to grid")) {
			foreach(var obj in Selection.objects){
				GameObject go = obj as GameObject;
				if(go != null){
					go.transform.rotation =  Quaternion.Euler(AlingToGrid(go.transform.rotation.eulerAngles, 45.0f));
				}
			}
		}

	    if (GUILayout.Button("Add physics extension")) {
	        var rb = FindObjectsOfType<Rigidbody2D>();
	        foreach (var body in rb) {
	            var ex = body.GetComponent<Physics2DEx>();
	            if (ex == null) {
                    ex = body.gameObject.AddComponent<Physics2DEx>();
                    Debug.Log("Add PhysicsEx to " + body.name);
	            }
	        }
           //rb[0].worldCenterOfMass
            // rb[0].GetPointVelocity()
	    }

	    /*myString = EditorGUILayout.TextField ("Text Field", myString);
		
		groupEnabled = EditorGUILayout.BeginToggleGroup ("Optional Settings", groupEnabled);
		myBool = EditorGUILayout.Toggle ("Toggle", myBool);
		myFloat = EditorGUILayout.Slider ("Slider", myFloat, -3, 3);
		EditorGUILayout.EndToggleGroup ();*/
	}
}