using UnityEngine;
using UnityEditor;
using System.Collections;

public class EMGuiTools{

	private static Texture2D gradientTexture;
	private static Texture2D checkerTexture;
	
	#region Widget
	public static bool BeginFoldOut(string text,bool foldOut, bool endSpace=true){
		
		text = "<b><size=11>" + text + "</size></b>";
		if (foldOut){
			text = "\u25BC " + text;
		}
		else{
			text = "\u25BA " + text;
		}
		
		if ( !GUILayout.Toggle(true,text,"dragtab")){
			foldOut=!foldOut;
		}
		
		if (!foldOut && endSpace)GUILayout.Space(5f);
		
		return foldOut;
	}
	
	public static void BeginGroup(int padding=0){
		
		
		GUILayout.BeginHorizontal();
		GUILayout.Space(padding);
		EditorGUILayout.BeginHorizontal("As TextArea", GUILayout.MinHeight(10f));
		GUILayout.BeginVertical();
		GUILayout.Space(2f);
		
		
	}
	
	public static void EndGroup(bool endSpace = true){
		GUILayout.Space(3f);
		GUILayout.EndVertical();
		EditorGUILayout.EndHorizontal();
		GUILayout.Space(3f);
		GUILayout.EndHorizontal();
		
		if (endSpace){
			GUILayout.Space(10f);
		}
	}
	
	
	public static bool Toggle(string text, bool value,bool leftToggle=false, int width=-1, bool bold=false){


		if (value) GUI.backgroundColor = Color.green; else GUI.backgroundColor = Color.red;

		GUIStyle boldStyle = new GUIStyle( "toggle");
		boldStyle.fontStyle = FontStyle.Bold;

		if (leftToggle){
			if (width==-1)
				value = EditorGUILayout.ToggleLeft(text,value);
			else
				value = GUILayout.Toggle(value,text,boldStyle,GUILayout.Width(width));
		}
		else{
			if (width==-1)
				value = EditorGUILayout.Toggle(text,value);
			else
				value = GUILayout.Toggle(value,text,boldStyle,GUILayout.Width(width));
		}
		
		GUI.backgroundColor = Color.white;


		return value;
		
	}

	public static bool BeginToogleGroup(string text, bool value,int indent=0){
		if (value) GUI.backgroundColor = Color.green; else GUI.backgroundColor = Color.red;
		value = EditorGUILayout.BeginToggleGroup( text,value);
		GUI.backgroundColor = Color.white;

		if (value)
			EMGuiTools.BeginGroup(indent);

		return value;
	}

	public static void EndToggleGroup( bool value,bool space=false){
		if (value)
			EMGuiTools.EndGroup(space);

		EditorGUILayout.EndToggleGroup();
	}


	static public bool Button(string label,Color color,int width, bool leftAligment=false, int height=0){
		
		GUI.backgroundColor  = color;
		GUIStyle buttonStyle = new GUIStyle("Button");
		
		if (leftAligment)
			buttonStyle.alignment = TextAnchor.MiddleLeft;
		
		if (height==0){
			if (GUILayout.Button( label,buttonStyle,GUILayout.Width(width))){
				GUI.backgroundColor = Color.white;
				return true;	
			}
		}
		else{
			if (GUILayout.Button( label,buttonStyle,GUILayout.Width(width),GUILayout.Height(height))){
				GUI.backgroundColor = Color.white;
				return true;	
			}			
		}
		GUI.backgroundColor = Color.white;		
		
		return false;
	}
	#endregion
	
	#region 2d effect
	public static void DrawSeparatorLine(int padding=0){
		
		EditorGUILayout.Space();
		DrawLine(Color.gray, padding);
		EditorGUILayout.Space();
	}
	
	private static void DrawLine(Color color,int padding=0){
		
		GUILayout.Space(10);
		Rect lastRect = GUILayoutUtility.GetLastRect();
		
		GUI.color = color;
		GUI.DrawTexture(new Rect(padding, lastRect.yMax -lastRect.height/2f, Screen.width, 1f), EditorGUIUtility.whiteTexture);
		GUI.color = Color.white;
	}
	#endregion
	
	#region Texture
	public static void DrawTextureRectPreview( Rect rect, Rect textureRect, Texture2D tex, Color color){
		
		GUI.color = color;
		GUI.DrawTexture( rect, EditorGUIUtility.whiteTexture);
		GUI.color = Color.white;
		
		rect = new Rect(rect.x+2,rect.y+2,rect.width-4,rect.height-4);
		DrawTileTexture( rect, EMGuiTools.GetCheckerTexture());

		if (tex!=null){		
			GUI.DrawTextureWithTexCoords( rect, tex,textureRect );
		}
		
	}

	public static void DrawTileTexture (Rect rect, Texture tex)
	{
		GUI.BeginGroup(rect);
		{
			int width  = Mathf.RoundToInt(rect.width);
			int height = Mathf.RoundToInt(rect.height);
			
			for (int y = 0; y < height; y += tex.height)
			{
				for (int x = 0; x < width; x += tex.width)
				{
					GUI.DrawTexture(new Rect(x, y, tex.width, tex.height), tex);
				}
			}
		}
		GUI.EndGroup();
	}

	private static Rect DrawGradient(int padding, int width, int height=35){
		
		GUILayout.Space(height);
		Rect lastRect = GUILayoutUtility.GetLastRect();
		lastRect.yMin = lastRect.yMin + 7;
		lastRect.yMax = lastRect.yMax - 7;
		lastRect.width =  Screen.width;
		
		GUI.DrawTexture(new Rect(padding,lastRect.yMin+1,width, lastRect.yMax- lastRect.yMin), GetGradientTexture());
		
		return lastRect;
	}
	
	private static Texture2D GetGradientTexture(){
		
		if (gradientTexture==null){
			gradientTexture = CreateGradientTexture();
		}
		return gradientTexture;
		
	}
	
	private static Texture2D CreateGradientTexture(){
		
		int height =18;
		
		Texture2D myTexture = new Texture2D(1, height);
		myTexture.hideFlags = HideFlags.HideInInspector;
		myTexture.hideFlags = HideFlags.DontSave;
		myTexture.filterMode = FilterMode.Bilinear;
		
		Color startColor= new Color(0.4f,0.4f,0.4f);
		Color endColor= new Color(0.6f,0.6f,0.6f);
		
		float stepR = (endColor.r - startColor.r)/18f;
		float stepG = (endColor.g - startColor.g)/18f;
		float stepB = (endColor.b - startColor.b)/18f;
		
		Color pixColor = startColor;
		
		for (int i = 1; i < height-1; i++)
		{
			pixColor = new Color(pixColor.r + stepR,pixColor.g + stepG , pixColor.b + stepB);
			myTexture.SetPixel(0, i, pixColor);
		}
		
		myTexture.SetPixel(0, 0, new Color(0,0,0));
		myTexture.SetPixel(0, 17, new Color(1,1,1));
		
		myTexture.Apply();
		
		return myTexture;
	}

	public static Texture2D GetCheckerTexture(){
		if (EMGuiTools.checkerTexture==null){
			EMGuiTools.checkerTexture = CreateCheckerTexture();
		}
		return checkerTexture;		
	}
	
	private static Texture2D CreateCheckerTexture(){
		
		Texture2D myTexture = new Texture2D(16, 16);
		myTexture.hideFlags = HideFlags.DontSave;
		
		Color color1 = new Color(0.5f,0.5f,0.5f);
		for( int x=0;x<8;x++){
			for( int y=0;y<8;y++){
				myTexture.SetPixel(x, y, color1);
				myTexture.SetPixel(x+8, y+8, color1);
			}
		}
		
		color1 = new Color(0.3f,0.3f,0.3f);
		for( int x=0;x<8;x++){
			for( int y=0;y<8;y++){
				myTexture.SetPixel(x+8, y, color1);
				myTexture.SetPixel(x, y+8, color1);
			}
		}
		
		myTexture.Apply();
		
		return myTexture;
	}	
	#endregion
}
