using UnityEngine;
using Unity.Cinemachine;

namespace BaseGames.Camera
{
    /// <summary>
    /// 单房间虚拟相机。激活时提升优先级，停用时降为 0。
    /// 挂载在每个房间的 CinemachineCamera GameObject 上。
    /// </summary>
    [RequireComponent(typeof(CinemachineCamera))]
    public class RoomCamera : MonoBehaviour
    {
        [Header("房间设置")]
        [SerializeField] private RoomVisibleArea    _visibleArea;
        [SerializeField] private Vector2            _cameraOffset = Vector2.zero;
        [SerializeField] private CameraBlendProfileSO _blendProfile;
        [SerializeField] private int                _activePriority = 15;

        [Header("可视区域（透视相机）")]
        [Tooltip("摄像机应显示的最大可视矩形（世界坐标）。\n" +
                 "在 Scene 视图中可直接拖拽四条边编辑，然后点击 Inspector 中的\n" +
                 "「从可视区域更新限位区域」按钮将其换算为 CinemachineConfiner2D 所需的限位多边形。")]
        [SerializeField] private Rect  _visibleBounds = new Rect(-12f, -6f, 24f, 12f);

        [Tooltip("摄像机到场景平面（Z = 0）的垂直距离，用于透视视口尺寸计算。\n" +
                 "留 0 时自动取 transform.position.z 的绝对值（推荐）。")]
        [SerializeField] private float _cameraDepth = 0f;

        private CinemachineCamera _vcam;

        private void Awake()  => _vcam = GetComponent<CinemachineCamera>();
        private void OnEnable()  => _vcam.Priority = _activePriority;
        private void OnDisable() => _vcam.Priority = 0;

        public PolygonCollider2D     ConfinerCollider => _visibleArea?.Collider;
        public Vector2               CameraOffset     => _cameraOffset;
        public CameraBlendProfileSO  BlendProfile     => _blendProfile;
        public Rect                  VisibleBounds    => _visibleBounds;

        /// <summary>
        /// 摄像机到场景平面的有效深度。
        /// _cameraDepth > 0 时使用配置值，否则自动读取 |transform.position.z|，再兜底 10。
        /// </summary>
        public float CameraDepth
        {
            get
            {
                if (_cameraDepth > 0f) return _cameraDepth;
                float z = Mathf.Abs(transform.position.z);
                return z > 0.01f ? z : 10f;
            }
        }

        /// <summary>在 CameraStateController 管理的激活流程中调用。</summary>
        public void Activate()   => gameObject.SetActive(true);
        public void Deactivate() => gameObject.SetActive(false);

        // ── Gizmo ──────────────────────────────────────────────────────────────
        private void OnDrawGizmosSelected()
        {
            // 黄色：可视区域（设计意图——玩家在此房间内的最大可见范围）
            Vector3 center = new Vector3(_visibleBounds.center.x, _visibleBounds.center.y, 0f);
            Vector3 size   = new Vector3(_visibleBounds.width,    _visibleBounds.height,   0.01f);

            Gizmos.color = new Color(1f, 0.85f, 0.15f, 0.10f);
            Gizmos.DrawCube(center, size);
            Gizmos.color = new Color(1f, 0.85f, 0.15f, 0.90f);
            Gizmos.DrawWireCube(center, size);
        }
    }
}