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custom-chatbot
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using Photon.Deterministic;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[RequireComponent(typeof(Camera))]
public class CameraFollow : MonoBehaviour
{
  public Transform Target;
  public Quantum.LayerMask OcclusionQueryMask = -1;
  [SerializeField, Range(2f, 15f)]
  float distance = 5f;
  [SerializeField, Range(0.1f, 5f)]
  float scrollSpeed = 1f;
  [SerializeField, Min(0f)]
  float focusRadius = 1f;
  [SerializeField, Range(0f, 1f)]
  float focusCentering = 0.5f;

  [SerializeField, Range(1f, 360f)]
  float rotationSpeed = 90f;
  [SerializeField, Range(-30f, 89f)]
  float minVerticalAngle = -30f, maxVerticalAngle = 60f;

  Vector3 focusPoint;
  Vector2 orbitAngles = new Vector2(45f, 0f);

  private Camera _camera;
  void Awake()
  {
    //focusPoint = focus.position;
    transform.localRotation = Quaternion.Euler(orbitAngles);
    _camera = GetComponent<Camera>();
  }
  void LateUpdate()
  {
    if (Target == null) return;
    UpdateDistance();
    UpdateFocusPoint();
    Quaternion lookRotation;
    if (ManualRotation())
    {
      ConstrainAngles();
      lookRotation = Quaternion.Euler(orbitAngles);
    }
    else
    {
      lookRotation = transform.localRotation;
    }
    
    Vector3 lookDirection = lookRotation * Vector3.forward;
    Vector3 lookPosition = focusPoint - lookDirection * distance;

    if (Cast(focusPoint, lookRotation, -lookDirection, out var hitDistance, distance - _camera.nearClipPlane))
    {
      lookPosition = focusPoint - lookDirection * (hitDistance + _camera.nearClipPlane);
    }

    transform.SetPositionAndRotation(lookPosition, lookRotation);
  }

  private unsafe bool Cast(Vector3 origin, Quaternion rotation, Vector3 direction, out float hitDistance, float distance)
  {
    hitDistance = 0;

    var frame = QuantumRunner.Default?.Game?.Frames.Verified;
    if (frame != null)
    {
      var shape = Quantum.Shape3D.CreateBox(CameraPlaneExtends.ToFPVector3());
      var options = Quantum.QueryOptions.ComputeDetailedInfo | Quantum.QueryOptions.HitAll;
      var hit = frame.Physics3D.ShapeCast(origin.ToFPVector3(), rotation.ToFPQuaternion(), &shape, (direction * distance).ToFPVector3(), OcclusionQueryMask, options);
      if (hit.HasValue)
      {
        hitDistance = (origin - hit.Value.Point.ToUnityVector3()).magnitude;
        return true;
      }
    }
    return false;
  }

  Vector3 CameraPlaneExtends
  {
    get
    {
      Vector3 halfExtends;
      halfExtends.y =
        _camera.nearClipPlane *
        Mathf.Tan(0.5f * Mathf.Deg2Rad * _camera.fieldOfView) * 1.25f;
      halfExtends.x = halfExtends.y * _camera.aspect;
      halfExtends.z = 0.01f;
      return halfExtends;
    }
  }

  void UpdateDistance()
  {
    distance += Input.GetAxisRaw("Mouse ScrollWheel") * scrollSpeed;
    distance = Mathf.Clamp(distance, 2, 15);
  }

  bool ManualRotation()
  {
    Vector2 input = new Vector2(
      -Input.GetAxis("Mouse Y"),
      Input.GetAxis("Mouse X")
    );
    const float e = 0.001f;
    if (input.x < e || input.x > e || input.y < e || input.y > e)
    {
      orbitAngles += rotationSpeed * Time.unscaledDeltaTime * input;
      return true;
    }
    return false;
  }

  void UpdateFocusPoint()
  {
    Vector3 targetPoint = Target.position;
    if (focusRadius > 0f)
    {
      float distance = Vector3.Distance(targetPoint, focusPoint);
      float t = 1f;
      if (distance > 0.01f && focusCentering > 0f)
      {
        t = Mathf.Pow(1f - focusCentering, Time.unscaledDeltaTime);
      }
      if (distance > focusRadius)
      {
        t = Mathf.Min(t, focusRadius / distance);
      }
      focusPoint = Vector3.Lerp(targetPoint, focusPoint, t);
    }
    else
    {
      focusPoint = targetPoint;
    }
  }

  void ConstrainAngles()
  {
    orbitAngles.x =
      Mathf.Clamp(orbitAngles.x, minVerticalAngle, maxVerticalAngle);

    if (orbitAngles.y < 0f)
    {
      orbitAngles.y += 360f;
    }
    else if (orbitAngles.y >= 360f)
    {
      orbitAngles.y -= 360f;
    }
  }

  void OnValidate()
  {
    if (maxVerticalAngle < minVerticalAngle)
    {
      maxVerticalAngle = minVerticalAngle;
    }
  }
}