using UnityEngine;
using UnityEngine.InputSystem;

namespace KirbyAdventures
{
    /// <summary>
    /// Third-person follow camera with mouse look (avoids Cinemachine 3 API coupling).
    /// </summary>
    public class SimpleCameraFollow : MonoBehaviour
    {
        public Transform Target;
        public Transform YawPivot;
        public float Distance = 5.5f;
        public float Height = 1.6f;
        public float MouseSensitivity = 0.12f;
        public float MinPitch = -30f;
        public float MaxPitch = 55f;
        public float Smooth = 12f;

        float _yaw;
        float _pitch = 12f;

        public float Yaw => _yaw;
        public float Pitch => _pitch;

        void Start()
        {
            Cursor.lockState = CursorLockMode.Locked;
            Cursor.visible = false;
            if (YawPivot != null)
                _yaw = YawPivot.eulerAngles.y;
        }

        void LateUpdate()
        {
            if (Target == null) return;
            if (GameFlow.Instance != null && (GameFlow.Instance.IsPaused || GameFlow.Instance.HasWon))
                return;

            var mouse = Mouse.current;
            if (mouse != null)
            {
                var delta = mouse.delta.ReadValue();
                _yaw += delta.x * MouseSensitivity;
                _pitch -= delta.y * MouseSensitivity;
                _pitch = Mathf.Clamp(_pitch, MinPitch, MaxPitch);
            }

            if (YawPivot != null)
                YawPivot.rotation = Quaternion.Euler(0f, _yaw, 0f);

            var rot = Quaternion.Euler(_pitch, _yaw, 0f);
            var desired = Target.position + Vector3.up * Height + rot * (Vector3.back * Distance);
            transform.position = Vector3.Lerp(transform.position, desired, 1f - Mathf.Exp(-Smooth * Time.deltaTime));
            transform.rotation = Quaternion.Slerp(transform.rotation, rot, 1f - Mathf.Exp(-Smooth * Time.deltaTime));
        }
    }
}