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

public class CharacterLookatController : MonoBehaviour
{
    [SerializeField] private Transform headLookat;
    [SerializeField] private Transform bodyLookat;

    [SerializeField] private Transform headBone;

    [Header("Head Rotation Limits")]
    [SerializeField] private float maxYaw = 60f;  // Left/right
    [SerializeField] private float maxPitch = 30f; // Up/down

    private void LateUpdate()
    {
        // Rotate body on XZ plane
        Vector3 bodyLookatPlanarXZ = bodyLookat.position;
        bodyLookatPlanarXZ.y = transform.position.y;
        Vector3 bodyDirection = (bodyLookatPlanarXZ - transform.position).normalized;
        if (bodyDirection != Vector3.zero)
            transform.forward = bodyDirection;

        // Head direction clamping
        Vector3 headDirectionWorld = headLookat.position - headBone.position;
        Quaternion lookRotation = Quaternion.LookRotation(headDirectionWorld, Vector3.up);

        // Convert world rotation to local rotation relative to body
        Quaternion localRotation = Quaternion.Inverse(transform.rotation) * lookRotation;
        Vector3 localEuler = localRotation.eulerAngles;

        // Convert angles from 0-360 to -180 to 180
        localEuler.x = NormalizeAngle(localEuler.x);
        localEuler.y = NormalizeAngle(localEuler.y);

        // Clamp pitch (x) and yaw (y)
        localEuler.x = Mathf.Clamp(localEuler.x, -maxPitch, maxPitch);
        localEuler.y = Mathf.Clamp(localEuler.y, -maxYaw, maxYaw);

        // Reconstruct the clamped rotation
        Quaternion clampedLocalRotation = Quaternion.Euler(localEuler);
        Quaternion clampedWorldRotation = transform.rotation * clampedLocalRotation;

        headBone.rotation = clampedWorldRotation;
    }

    private float NormalizeAngle(float angle)
    {
        if (angle > 180f)
            angle -= 360f;
        return angle;
    }
}