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using UnityEngine;
using System.Collections;

public class EventManager : MonoBehaviour 
{
    // This line is defining a type alias called ClickAction. A ClickAction is a
    // function that takes in no arguments and has a return type of void. Any function
    // that matches this signature is a ClickAction
    public delegate void ClickAction();
    
    // This line is declaring an event in a static variable. You can think of an event
    // as being like a list of callback functions. These callback functions must have
    // type ClickAction
    public static event ClickAction OnClicked;

    void OnGUI()
    {
        if(GUI.Button(new Rect(Screen.width / 2 - 50, 5, 100, 30), "Click"))
        {
            // This if statement checks whether or not there are any callback functions
            // registered with the OnClick event.
            if(OnClicked != null)
                // Here we call the OnClick event. Internally, C# goes through the list of
                // callback functions and invokes them one at a time
                OnClicked();
        }
    }
}



public class TeleportScript : MonoBehaviour 
{
    void OnEnable()
    {
        // This line will add a callback to the OnClick event that we defined previously
        EventManager.OnClicked += Teleport;
    }
    
    
    void OnDisable()
    {
        // This line will remove the callback when the GameObject is disabled or destroyed
        EventManager.OnClicked -= Teleport;
    }
    
    // This method is a ClickAction since it takes no parameters and has a void return type
    void Teleport()
    {
        // This method will be invoked by the EventManager since we added this method
        // as a callback in the OnEnable method
        
        // Do the teleportation
        Vector3 pos = transform.position;
        pos.y = Random.Range(1.0f, 3.0f);
        transform.position = pos;
    }
}





public class TurnColorScript : MonoBehaviour 
{
    void OnEnable()
    {
        // This line will add a callback to the OnClick event that we defined previously
        EventManager.OnClicked += TurnColor;
    }
    
    
    void OnDisable()
    {
        // This line will remove the callback when the GameObject is disabled or destroyed
        EventManager.OnClicked -= TurnColor;
    }
    
    // This method is a ClickAction since it takes no parameters and has a void return type
    void TurnColor()
    {
        // This method will be invoked by the EventManager since we added this method
        // as a callback in the OnEnable method
    
        // Change the color
        Color col = new Color(Random.value, Random.value, Random.value);
        renderer.material.color = col;
    }
}