using System;
using UnityEngine.Scripting.APIUpdating;
using UnityEngine.Serialization;

namespace UnityEngine.Rendering.LWRP
{
    [Obsolete("LWRP -> Universal (UnityUpgradable) -> UnityEngine.Rendering.Universal.UniversalAdditionalCameraData", true)]
    public class LWRPAdditionalCameraData
    {
    }
}

namespace UnityEngine.Rendering.Universal
{
    [MovedFrom("UnityEngine.Rendering.LWRP")] public enum CameraOverrideOption
    {
        Off,
        On,
        UsePipelineSettings,
    }

    //[Obsolete("Renderer override is no longer used, renderers are referenced by index on the pipeline asset.")]
    [MovedFrom("UnityEngine.Rendering.LWRP")] public enum RendererOverrideOption
    {
        Custom,
        UsePipelineSettings,
    }

    public enum AntialiasingMode
    {
        None,
        FastApproximateAntialiasing,
        SubpixelMorphologicalAntiAliasing,
        //TemporalAntialiasing
    }

    // Only used for SMAA right now
    public enum AntialiasingQuality
    {
        Low,
        Medium,
        High
    }

    [DisallowMultipleComponent]
    [RequireComponent(typeof(Camera))]
    [ImageEffectAllowedInSceneView]
    [MovedFrom("UnityEngine.Rendering.LWRP")] public class UniversalAdditionalCameraData : MonoBehaviour, ISerializationCallbackReceiver
    {
        [Tooltip("If enabled shadows will render for this camera.")]
        [FormerlySerializedAs("renderShadows"), SerializeField]
        bool m_RenderShadows = true;

        [Tooltip("If enabled depth texture will render for this camera bound as _CameraDepthTexture.")]
        [SerializeField]
        CameraOverrideOption m_RequiresDepthTextureOption = CameraOverrideOption.UsePipelineSettings;

        [Tooltip("If enabled opaque color texture will render for this camera and bound as _CameraOpaqueTexture.")]
        [SerializeField]
        CameraOverrideOption m_RequiresOpaqueTextureOption = CameraOverrideOption.UsePipelineSettings;

        [SerializeField] int m_RendererIndex = -1;

        [SerializeField] LayerMask m_VolumeLayerMask = 1; // "Default"
        [SerializeField] Transform m_VolumeTrigger = null;

        [SerializeField] bool m_RenderPostProcessing = false;
        [SerializeField] AntialiasingMode m_Antialiasing = AntialiasingMode.None;
        [SerializeField] AntialiasingQuality m_AntialiasingQuality = AntialiasingQuality.High;
        [SerializeField] bool m_StopNaN = false;
        [SerializeField] bool m_Dithering = false;

        // Deprecated:
        [FormerlySerializedAs("requiresDepthTexture"), SerializeField]
        bool m_RequiresDepthTexture = false;

        [FormerlySerializedAs("requiresColorTexture"), SerializeField]
        bool m_RequiresColorTexture = false;

        [HideInInspector] [SerializeField] float m_Version = 2;

        public float version => m_Version;

        public bool renderShadows
        {
            get => m_RenderShadows;
            set => m_RenderShadows = value;
        }

        public CameraOverrideOption requiresDepthOption
        {
            get => m_RequiresDepthTextureOption;
            set => m_RequiresDepthTextureOption = value;
        }

        public CameraOverrideOption requiresColorOption
        {
            get => m_RequiresOpaqueTextureOption;
            set => m_RequiresOpaqueTextureOption = value;
        }

        public bool requiresDepthTexture
        {
            get
            {
                if (m_RequiresDepthTextureOption == CameraOverrideOption.UsePipelineSettings)
                {
                    return UniversalRenderPipeline.asset.supportsCameraDepthTexture;
                }
                else
                {
                    return m_RequiresDepthTextureOption == CameraOverrideOption.On;
                }
            }
            set { m_RequiresDepthTextureOption = (value) ? CameraOverrideOption.On : CameraOverrideOption.Off; }
        }

        public bool requiresColorTexture
        {
            get
            {
                if (m_RequiresOpaqueTextureOption == CameraOverrideOption.UsePipelineSettings)
                {
                    return UniversalRenderPipeline.asset.supportsCameraOpaqueTexture;
                }
                else
                {
                    return m_RequiresOpaqueTextureOption == CameraOverrideOption.On;
                }
            }
            set { m_RequiresOpaqueTextureOption = (value) ? CameraOverrideOption.On : CameraOverrideOption.Off; }
        }

        public ScriptableRenderer scriptableRenderer
        {
            get => UniversalRenderPipeline.asset.GetRenderer(m_RendererIndex);
        }

        /// <summary>
        /// Use this to set this Camera's current ScriptableRenderer to one listed on the Render Pipeline Asset. Takes an index that maps to the list on the Render Pipeline Asset.
        /// </summary>
        /// <param name="index">The index that maps to the RendererData list on the currently assigned Render Pipeline Asset</param>
        public void SetRenderer(int index)
        {
            m_RendererIndex = index;
        }

        public LayerMask volumeLayerMask
        {
            get => m_VolumeLayerMask;
            set => m_VolumeLayerMask = value;
        }

        public Transform volumeTrigger
        {
            get => m_VolumeTrigger;
            set => m_VolumeTrigger = value;
        }

        public bool renderPostProcessing
        {
            get => m_RenderPostProcessing;
            set => m_RenderPostProcessing = value;
        }

        public AntialiasingMode antialiasing
        {
            get => m_Antialiasing;
            set => m_Antialiasing = value;
        }

        public AntialiasingQuality antialiasingQuality
        {
            get => m_AntialiasingQuality;
            set => m_AntialiasingQuality = value;
        }

        public bool stopNaN
        {
            get => m_StopNaN;
            set => m_StopNaN = value;
        }

        public bool dithering
        {
            get => m_Dithering;
            set => m_Dithering = value;
        }

        public void OnBeforeSerialize()
        {
        }

        public void OnAfterDeserialize()
        {
            if (version <= 1)
            {
                m_RequiresDepthTextureOption = (m_RequiresDepthTexture) ? CameraOverrideOption.On : CameraOverrideOption.Off;
                m_RequiresOpaqueTextureOption = (m_RequiresColorTexture) ? CameraOverrideOption.On : CameraOverrideOption.Off;
            }
        }
    }
}