using UnityEngine;
using System.Collections;
using UnityEngine.Events;

[AddComponentMenu("Playground/Conditions/Condition Area")]
public class ConditionArea : ConditionBase
{
    // the amount of times (in seconds) that this Condition will call OnTriggerStay
    // i.e. if it's 1, it means that OnTriggerStay will be called every second
    // i.e. if it's 4, it means that it will be called every 4 seconds
    // ... and so on...
    public float frequency = 1f;
    //not used in case of ColliderEventTypes.Enter and ColliderEventTypes.Exit


    //the type of event to check for
    [Header("Type of Event")]
    public ColliderEventTypes eventType = ColliderEventTypes.Enter;

    private float lastTimeTriggerStayCalled;

    // This function will be called at the beginning
    void Start()
    {
        lastTimeTriggerStayCalled = -frequency;
    }

    //This will create a dialog window asking for which dialog to add
    private void Reset()
    {
        Utils.Collider2DDialogWindow(this.gameObject, true);
    }

    //this function is called every time another collider enters this trigger
    private void OnTriggerEnter2D(Collider2D otherCollider)
    {
        //is this the type of event we need?
        if(eventType == ColliderEventTypes.Enter)
        {
            //check for the tag of the object which entered the area, if necessary
            if(otherCollider.CompareTag(filterTag) || !filterByTag)
            {
                ExecuteAllActions(otherCollider.gameObject);
            }
        }
    }

    // This will be called EVERY FRAME when something stays inside the trigger collider
    void OnTriggerStay2D(Collider2D otherCollider)
    {
        //is this the type of event we need?
        if(eventType == ColliderEventTypes.StayInside
            && Time.time >= lastTimeTriggerStayCalled + frequency) //check also the frequency
        {
            //check for the tag of the object which entered the area, if necessary
            if(otherCollider.CompareTag(filterTag) || !filterByTag)
            {
                ExecuteAllActions(otherCollider.gameObject);
                lastTimeTriggerStayCalled = Time.time;
            }
        }
    }

    //this function is called every time another collider exits this trigger
    private void OnTriggerExit2D(Collider2D otherCollider)
    {
        //is this the type of event we need?
        if(eventType == ColliderEventTypes.Exit)
        {

            //check for the tag of the object which entered the area, if necessary
            if(otherCollider.CompareTag(filterTag)
                || !filterByTag)
            {
                ExecuteAllActions(otherCollider.gameObject);
            }
        }
    }

    public enum ColliderEventTypes
    {
        Enter,
        Exit,
        StayInside
    }
}

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.Events;

public abstract class ConditionBase : MonoBehaviour
{
    //actionitems can be connected to GameplayAction scripts, and execute their one action (the method ExecuteAction implemented in each child class)
    [SerializeField]
    public List<Action> actions = new List<Action>();

    //custom actions are more complicated to setup but more powerful, and appear only if useCustomActions is enabled
    public bool useCustomActions = false;
    public UnityEvent customActions;

    //to perform the actions only once
    public bool happenOnlyOnce = false;
    private bool alreadyHappened = false;

    public bool filterByTag = false;
    public string filterTag = "Player";

    //dataObject is usually the other object in the collision
    public void ExecuteAllActions(GameObject dataObject)
    {        
        //first check if the action has already been executed
        if(happenOnlyOnce && alreadyHappened)
            return;

        //first execute the simple GameplayActions, if present
        bool actionResult;
        foreach(Action ga in actions)
        {
            if(ga != null)
            {
                actionResult = ga.ExecuteAction(dataObject);
                if(actionResult == false)
                {
                    Debug.LogWarning("An action failed and interrupted the chain of Actions");
                    return;
                }
            }
        }

        //execute the custom actions, if present and enabled
        if(useCustomActions)
        {
            customActions.Invoke();
        }

        alreadyHappened = true; //will prevent re-executing the actions if happenOnlyOnce is true
    }
}