using Input;
using UnityEngine;

namespace Interactions
{
    [RequireComponent(typeof(Interactable))]
    public class Pickup : MonoBehaviour
    {
        public PickupItemData itemData;
        public SpriteRenderer iconRenderer;
        protected Interactable Interactable;
        private PlayerTouchController _playerRef;
        protected FollowerController FollowerController;
        
        /// <summary>
        /// Unity Awake callback. Sets up icon, interactable, and event handlers.
        /// </summary>
        void Awake()
        {
            if (iconRenderer == null)
                iconRenderer = GetComponent<SpriteRenderer>();
            
            Interactable = GetComponent<Interactable>();
            if (Interactable != null)
            {
                Interactable.interactionStarted.AddListener(OnInteractionStarted);
                Interactable.characterArrived.AddListener(OnCharacterArrived);
            }

            ApplyItemData();
        }

        /// <summary>
        /// Unity OnDestroy callback. Cleans up event handlers.
        /// </summary>
        void OnDestroy()
        {
            if (Interactable != null)
            {
                Interactable.interactionStarted.RemoveListener(OnInteractionStarted);
                Interactable.characterArrived.RemoveListener(OnCharacterArrived);
            }
        }

#if UNITY_EDITOR
        /// <summary>
        /// Unity OnValidate callback. Ensures icon and data are up to date in editor.
        /// </summary>
        void OnValidate()
        {
            if (iconRenderer == null)
                iconRenderer = GetComponent<SpriteRenderer>();
            ApplyItemData();
        }
#endif

        /// <summary>
        /// Applies the item data to the pickup (icon, name, etc).
        /// </summary>
        public void ApplyItemData()
        {
            if (itemData != null)
            {
                if (iconRenderer != null && itemData.mapSprite != null)
                {
                    iconRenderer.sprite = itemData.mapSprite;
                }

                gameObject.name = itemData.itemName;
            }
        }

        /// <summary>
        /// Handles the start of an interaction (for feedback/UI only).
        /// </summary>
        private void OnInteractionStarted(PlayerTouchController playerRef, FollowerController followerRef)
        {
            _playerRef = playerRef;
            FollowerController = followerRef;
        }

        protected virtual void OnCharacterArrived()
        {
            var combinationResult = FollowerController.TryCombineItems(this, out var combinationResultItem);
            if (combinationResultItem != null)
            {
                Interactable.BroadcastInteractionComplete(true);
                return;
            }
            
            FollowerController?.TryPickupItem(gameObject, itemData);
            Interactable.BroadcastInteractionComplete(combinationResult == FollowerController.CombinationResult.NotApplicable);
        }
    }
}