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

public interface IMeshGenerator{
	void OnGUI();
}

public class NodeEditor : EditorWindow {



	List<Rect> windows = new List<Rect>();
	
	List<int> windowsToAttach = new List<int>();
	
	List<int> attachedWindows = new List<int>();
	
	
	
	[MenuItem("Window/Node editor")]
	
	static void ShowEditor() {
		
		NodeEditor editor = EditorWindow.GetWindow<NodeEditor>();
		
	}
	
	
	
	
	
	void OnGUI() {
		
		if (windowsToAttach.Count == 2) {
			
			attachedWindows.Add(windowsToAttach[0]);
			
			attachedWindows.Add(windowsToAttach[1]);
			
			windowsToAttach = new List<int>();
			
		}
		
		
		
		if (attachedWindows.Count >= 2) {
			
			for (int i = 0; i < attachedWindows.Count; i += 2) {
				
				DrawNodeCurve(windows[attachedWindows[i]], windows[attachedWindows[i + 1]]);
				
			}
			
		}
		
		
		
		BeginWindows();
		
		
		
		if (GUILayout.Button("Create Node")) {
			
			windows.Add(new Rect(10, 10, 100, 100));
			
		}
		
		
		
		for (int i = 0; i < windows.Count; i++) {
			
			windows[i] = GUI.Window(i, windows[i], DrawNodeWindow, "Window " + i);
			
		}
		
		
		
		EndWindows();
		
	}
	
	
	
	
	
	void DrawNodeWindow(int id) {
		
		if (GUILayout.Button("Attach")) {
			
			windowsToAttach.Add(id);
			
		}
		
		
		
		GUI.DragWindow();
		
	}
	
	
	
	
	
	void DrawNodeCurve(Rect start, Rect end) {
		
		Vector3 startPos = new Vector3(start.x + start.width, start.y + start.height / 2, 0);
		
		Vector3 endPos = new Vector3(end.x, end.y + end.height / 2, 0);
		
		Vector3 startTan = startPos + Vector3.right * 50;
		
		Vector3 endTan = endPos + Vector3.left * 50;
		
		Color shadowCol = new Color(0, 0, 0, 0.06f);
		
		
		
		for (int i = 0; i < 3; i++) {// Draw a shadow
			
			Handles.DrawBezier(startPos, endPos, startTan, endTan, shadowCol, null, (i + 1) * 5);
			
		}
		
		
		
		Handles.DrawBezier(startPos, endPos, startTan, endTan, Color.black, null, 1);
		
	}
}