ScienceLab.GravityForce/Assets/Materials/Scripts/CelestialCalendarController.cs

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

public class CelestialCalendarController : MonoBehaviour
{
    [System.Serializable]
    public class PlanetCalendar
    {
        public GameObject planet;
        public GameObject calendar;
    }

    [SerializeField] private List<PlanetCalendar> planetCalendars;

    private GameObject _activeCalendar;
    private Camera _activeCamera;

    void Start()
    {
        foreach (var item in planetCalendars)
        {
            if (item.calendar != null)
                item.calendar.SetActive(false);
        }

        UpdateActiveCamera();
    }

    void Update()
    {
        UpdateActiveCamera();

        if (_activeCamera == null)
        {
            return;
        }

        for (int i = 0; i <= 9; i++)
        {
            if (Input.GetKeyDown(KeyCode.Alpha0 + i) ||
                Input.GetKeyDown(KeyCode.Keypad0 + i))
            {
                HideActive();
                return;
            }
        }

        if (!Input.GetMouseButtonDown(0))
            return;

        Ray ray = _activeCamera.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;

        if (!Physics.Raycast(ray, out hit))
        {
            HideActive();
            return;
        }

        foreach (var item in planetCalendars)
        {
            if (item.planet == null) continue;

            if (hit.collider.gameObject == item.planet ||
                hit.collider.transform.IsChildOf(item.planet.transform))
            {
                ToggleCalendar(item.calendar);
                return;
            }
        }

        HideActive();
    }

    void UpdateActiveCamera()
    {
        Camera[] cameras = Camera.allCameras;

        foreach (var cam in cameras)
        {
            if (cam.enabled && cam.gameObject.activeInHierarchy)
            {
                _activeCamera = cam;
                return;
            }
        }

        _activeCamera = null;
    }

    void ToggleCalendar(GameObject calendar)
    {
        if (calendar == null) return;

        if (_activeCalendar == calendar)
        {
            HideActive();
            return;
        }

        HideActive();

        calendar.SetActive(true);
        _activeCalendar = calendar;
    }

    void HideActive()
    {
        if (_activeCalendar != null)
        {
            _activeCalendar.SetActive(false);
            _activeCalendar = null;
        }
    }
}