using UnityEngine;
using Fusion;
using System.Collections.Generic;
using System;

namespace OnlyScove.Scripts
{
    public class PlayerInteraction : NetworkBehaviour
    {
        [Header("Interaction Settings")]
        [SerializeField] public float InteractionRange = 2f;
        [SerializeField] public LayerMask InteractionMask;

        public event Action<IInteractable> OnInteractableTargetChanged;

        private List<IInteractable> interactablesNearby = new List<IInteractable>();
        private int currentInteractableIndex = 0;
        private EnvironmentScanner scanner;

        public void Initialize(EnvironmentScanner scanner)
        {
            this.scanner = scanner;
        }

        public void UpdateInteractables()
        {
            if (scanner == null) return;

            interactablesNearby.Clear();
            IInteractable target = scanner.ScanForInteractable(InteractionRange, InteractionMask);
            
            if (target != null) interactablesNearby.Add(target);
            OnInteractableTargetChanged?.Invoke(target);
            
            if (Object != null && Object.HasInputAuthority)
            {
                // UI Placeholder: Interaction UI
                // Example: UI.UIEventBus.TriggerInteractionPrompt(target?.InteractionPrompt);
                // Example: UI.UIEventBus.TriggerInteractionVisibility(target != null);
            }

            currentInteractableIndex = 0;
        }

        public void NextInteract()
        {
            if (interactablesNearby.Count <= 1) return;
            currentInteractableIndex = (currentInteractableIndex + 1) % interactablesNearby.Count;
            NotifyTargetChanged();
        }

        public void PreviousInteract()
        {
            if (interactablesNearby.Count <= 1) return;
            currentInteractableIndex = (currentInteractableIndex - 1 + interactablesNearby.Count) % interactablesNearby.Count;
            NotifyTargetChanged();
        }

        private void NotifyTargetChanged()
        {
            IInteractable target = GetInteractable();
            OnInteractableTargetChanged?.Invoke(target);
            if (Object != null && Object.HasInputAuthority)
            {
                // UI Placeholder: Update Prompt
                // Example: UI.UIEventBus.TriggerInteractionPrompt(target?.InteractionPrompt);
            }
        }

        public IInteractable GetInteractable() 
        {
            return (interactablesNearby == null || interactablesNearby.Count == 0) ? null : interactablesNearby[currentInteractableIndex];
        }
    }
}