using System;
using UnityEngine;
using UnityEngine.Rendering.HighDefinition;

[ExecuteInEditMode]
public class CubemapCameraController : MonoBehaviour
{
    static readonly Vector3[] k_Orientations = new[]
    {
        new Vector3(0, 0, 0), 
        new Vector3(0, 1, 0), 
        new Vector3(0, 2, 0), 
        new Vector3(0, 3, 0),
        new Vector3(-1, 0, 0), // ceiling
    };

    [SerializeField]
    bool m_InvalidateBuffersOnSwitch;
    
    int m_Index;

    void OnEnable()
    {
        m_Index = 0;
    }

    void Update()
    {
        // B + left or right arrow to switch orientation
        if (Input.GetKey(KeyCode.B))
            Next();
    }

    public void Next()
    {
        m_Index = (m_Index + 1) % k_Orientations.Length;
        SetOrientation(m_Index);
    }

    // we deliberately set transform outside update to avoid conflict with other camera controllers
    void SetOrientation(int index)
    {
        var camera = Camera.main;
        if (camera != null)
        {
            camera.transform.rotation = Quaternion.Euler(k_Orientations[index] * 90);
            if (m_InvalidateBuffersOnSwitch)
            {
                HDCamera hdCam = HDCamera.GetOrCreate(camera);
                hdCam.Reset();
                hdCam.volumetricHistoryIsValid = false;
                hdCam.colorPyramidHistoryIsValid = false;
            }
        }
    }
}