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

namespace MoreMountains.Tools
{
    /// <summary>
    /// A class used to store MMInputExecution bindings, associating a target keycode to UnityEvents
    /// </summary>
    [System.Serializable]
    public class MMInputExecutionBinding
    {
        /// the key the user needs to press to trigger events
        public KeyCode TargetKey = KeyCode.Space;
        /// the event to trigger when the key is pressed down
        public UnityEvent OnKeyDown;
        /// the event to trigger every frame if the key is being pressed 
        public UnityEvent OnKey;
        /// the event to trigger when the key is released
        public UnityEvent OnKeyUp;

        /// <summary>
        /// Checks for input and invokes events if needed
        /// </summary>
        public virtual void ProcessInput()
        {
            if (OnKey != null)
            {
                if (Input.GetKey(TargetKey))
                {
                    OnKey.Invoke();
                }
            }
            if (OnKeyDown != null)
            {
                if (Input.GetKeyDown(TargetKey))
                {
                    OnKeyDown.Invoke();
                }
            }
            if (OnKeyUp != null)
            {
                if (Input.GetKeyUp(TargetKey))
                {
                    OnKeyUp.Invoke();
                }
            }
        }
    }

    /// <summary>
    /// A simple class used to bind target keys to specific events to trigger when the key is pressed or released
    /// </summary>
    public class MMInputExecution : MonoBehaviour
    {
        [Header("Bindings")]
        /// a list of bindings
        public List<MMInputExecutionBinding> Bindings;
        
        /// <summary>
        /// On update we process our input
        /// </summary>
        protected virtual void Update()
        {
            HandleInput();
        }

        /// <summary>
        /// Parses all bindings and asks them to trigger events if needed
        /// </summary>
        protected virtual void HandleInput()
        {
            foreach(MMInputExecutionBinding binding in Bindings)
            {
                binding.ProcessInput();
            }            
        }
    }
}