using System.Collections.Generic;
using UnityEngine;
using TMPro;
using System.Collections;
using System;

[RequireComponent(typeof(Animator))]
public class IKControl : MonoBehaviour
{
    public List<Transform> lookObjects = new List<Transform>();
    public float weightDamping = 1.5f;
    private Animator animator;
    private Transform lastPrimaryTarget;
    private float lerpEndDistance = 0.1f;
    private float finalLookWeight = 0;
    private bool transitionToNextTarget = false;

    [Header("UI Reference")]
    public TextMeshProUGUI descriptionText; // Reference to the TextMeshProUGUI component
    public GameObject descriptionPanel; // Reference to the UI Panel

    void Start()
    {
        animator = GetComponent<Animator>();
        if (descriptionPanel != null)
        {
            descriptionPanel.SetActive(false); // Hide the panel initially
        }
    }

    void OnAnimatorIK()
    {
        if (lookObjects.Count > 0)
        {
            Transform primaryTarget = null;
            float closestLookWeight = 0;

            foreach (Transform target in lookObjects)
            {
                InteractableItem interactableItem = target.GetComponent<InteractableItem>();
                if (interactableItem == null) continue;

                if(!interactableItem.isInteractable)
                {
                    continue;
                }

                float distance = Vector3.Distance(transform.position, target.position);
                if (distance > interactableItem.interactionDistance) continue;

                Vector3 lookAt = target.position - transform.position;
                lookAt.y = 0f;
                float dotProduct = Vector3.Dot(new Vector3(transform.forward.x, 0f, transform.forward.z).normalized, lookAt.normalized);
                float lookWeight = Mathf.Clamp(dotProduct, 0f, 1f);
                if (lookWeight > closestLookWeight)
                {
                    closestLookWeight = lookWeight;
                    primaryTarget = target;
                }
            }

            if (primaryTarget != null)
            {
                if ((lastPrimaryTarget != null) && (lastPrimaryTarget != primaryTarget) && (finalLookWeight > 0f))
                {
                    transitionToNextTarget = true;
                }
            }

            if ((primaryTarget != null) && !transitionToNextTarget)
            {
                lastPrimaryTarget = primaryTarget;
                finalLookWeight = Mathf.Lerp(finalLookWeight, closestLookWeight, Time.deltaTime * weightDamping);
                float bodyWeight = finalLookWeight * 0.75f;
                animator.SetLookAtWeight(finalLookWeight, bodyWeight, 1f);
                animator.SetLookAtPosition(primaryTarget.position);

                InteractableItem interactableItem = primaryTarget.GetComponent<InteractableItem>();
                if (interactableItem != null)
                {
                    if (interactableItem.IsAction())
                    {
                        // Implement the action logic here, e.g., triggering an animation or interaction
                        Debug.Log("Performing action: " + interactableItem.description);
                    }
                    else
                    {
                        // Display description logic
                        DisplayDescription(interactableItem.description);
                    }
                }
            }
            else
            {
                // Clear the description text when not looking at any target
                ClearDescription();
            }

            if ((primaryTarget == null && lastPrimaryTarget != null) || transitionToNextTarget)
            {
                finalLookWeight = Mathf.Lerp(finalLookWeight, 0f, Time.deltaTime * weightDamping);
                float bodyWeight = finalLookWeight * 0.75f;
                animator.SetLookAtWeight(finalLookWeight, bodyWeight, 1f);
                animator.SetLookAtPosition(lastPrimaryTarget.position);
                if (finalLookWeight < lerpEndDistance)
                {
                    transitionToNextTarget = false;
                    finalLookWeight = 0f;
                    lastPrimaryTarget = null;
                    // Clear the description text when transitioning to no target
                    ClearDescription();
                }
            }
        }
        else
        {
            // Clear the description text if no objects are in the lookObjects list
            ClearDescription();
        }
    }

    private void DisplayDescription(string description)
    {
        if (descriptionText != null && descriptionPanel != null)
        {
            descriptionPanel.SetActive(true);
            descriptionText.text = description;
        }
    }

    private void ClearDescription()
    {
        if (descriptionText != null && descriptionPanel != null)
        {
            descriptionText.text = "";
            descriptionPanel.SetActive(false);
        }
    }
}