using Unity.Cinemachine;
using UnityEngine;

namespace NightclubArcadia.Cinematics
{
    /// <summary>
    /// Raises a reveal camera priority while the player is inside the volume.
    /// </summary>
    [RequireComponent(typeof(BoxCollider))]
    public sealed class CameraFramingVolume : MonoBehaviour
    {
        [SerializeField] CinemachineCamera revealCamera;
        [SerializeField] int activePriority = 20;
        [SerializeField] float minDwell = 0.5f;

        CameraStateDirector stateDirector;
        int defaultPriority;
        int occupants;
        float exitTimer;

        void Awake()
        {
            var box = GetComponent<BoxCollider>();
            box.isTrigger = true;

            if (revealCamera != null)
            {
                defaultPriority = revealCamera.Priority.Value;
            }

            stateDirector = FindFirstObjectByType<CameraStateDirector>();
        }

        void OnTriggerEnter(Collider other)
        {
            if (!other.CompareTag("Player") || revealCamera == null)
            {
                return;
            }

            occupants++;
            exitTimer = 0f;
            revealCamera.Priority.Value = activePriority;
            stateDirector?.RegisterReveal();
        }

        void OnTriggerExit(Collider other)
        {
            if (!other.CompareTag("Player") || revealCamera == null)
            {
                return;
            }

            occupants = Mathf.Max(0, occupants - 1);
            if (occupants == 0)
            {
                exitTimer = minDwell;
            }
        }

        void Update()
        {
            if (occupants > 0 || revealCamera == null)
            {
                return;
            }

            if (exitTimer > 0f)
            {
                exitTimer -= Time.deltaTime;
                return;
            }

            if (revealCamera.Priority.Value != defaultPriority)
            {
                revealCamera.Priority.Value = defaultPriority;
                stateDirector?.UnregisterReveal();
            }
        }
    }
}