using System;
using UnityEngine.Serialization;
using UnityEngine.Experimental.Rendering;

namespace UnityEngine.Rendering.HighDefinition
{
    // RenderRenderPipelineSettings represent settings that are immutable at runtime.
    // There is a dedicated RenderRenderPipelineSettings for each platform

    /// <summary>
    /// Possible values for the cubemap texture size used for reflection probes.
    /// </summary>
    [Serializable]
    public enum CubeReflectionResolution
    {
        /// <summary>Size 128</summary>
        CubeReflectionResolution128 = 128,
        /// <summary>Size 256</summary>
        CubeReflectionResolution256 = 256,
        /// <summary>Size 512</summary>
        CubeReflectionResolution512 = 512,
        /// <summary>Size 1024</summary>
        CubeReflectionResolution1024 = 1024,
        /// <summary>Size 2048</summary>
        CubeReflectionResolution2048 = 2048,
        /// <summary>Size 4096</summary>
        CubeReflectionResolution4096 = 4096
    }

    /// <summary>
    /// Available graphic formats for the cube and planar reflection probes.
    /// </summary>
    [System.Serializable]
    public enum ReflectionAndPlanarProbeFormat
    {
        /// <summary>Faster sampling and rendering but at the cost of precision.</summary>
        R11G11B10 = GraphicsFormat.B10G11R11_UFloatPack32,
        /// <summary>Better precision, but uses twice as much memory compared to R11G11B10.</summary>
        R16G16B16A16 = GraphicsFormat.R16G16B16A16_SFloat,
    }

    /// <summary>
    /// Possible values for the texture 2D size used for planar reflection probes.
    /// </summary>
    [Serializable]
    public enum PlanarReflectionAtlasResolution
    {
        /// <summary>Size 64</summary>
        Resolution64 = 64,
        /// <summary>Size 128</summary>
        Resolution128 = 128,
        /// <summary>Size 256</summary>
        Resolution256 = 256,
        /// <summary>Size 512</summary>
        Resolution512 = 512,
        /// <summary>Size 1024</summary>
        Resolution1024 = 1024,
        /// <summary>Size 2048</summary>
        Resolution2048 = 2048,
        /// <summary>Size 4096</summary>
        Resolution4096 = 4096,
        /// <summary>Size 8192</summary>
        Resolution8192 = 8192,
        /// <summary>Size 16384</summary>
        Resolution16384 = 16384
    }

    /// <summary>
    /// Possible values for the texture 2D size used for cookies.
    /// </summary>
    [Serializable]
    public enum CookieAtlasResolution
    {
        /// <summary>Size 64</summary>
        CookieResolution64 = 64,
        /// <summary>Size 128</summary>
        CookieResolution128 = 128,
        /// <summary>Size 256</summary>
        CookieResolution256 = 256,
        /// <summary>Size 512</summary>
        CookieResolution512 = 512,
        /// <summary>Size 1024</summary>
        CookieResolution1024 = 1024,
        /// <summary>Size 2048</summary>
        CookieResolution2048 = 2048,
        /// <summary>Size 4096</summary>
        CookieResolution4096 = 4096,
        /// <summary>Size 8192</summary>
        CookieResolution8192 = 8192,
        /// <summary>Size 16384</summary>
        CookieResolution16384 = 16384
    }

    /// <summary>
    /// Possible values for the cubemap texture size used for cookies.
    /// </summary>
    [Serializable]
    public enum CubeCookieResolution
    {
        /// <summary>Size 64</summary>
        CubeCookieResolution64 = 64,
        /// <summary>Size 128</summary>
        CubeCookieResolution128 = 128,
        /// <summary>Size 256</summary>
        CubeCookieResolution256 = 256,
        /// <summary>Size 512</summary>
        CubeCookieResolution512 = 512,
        /// <summary>Size 1024</summary>
        CubeCookieResolution1024 = 1024,
        /// <summary>Size 2048</summary>
        CubeCookieResolution2048 = 2048,
        /// <summary>Size 4096</summary>
        CubeCookieResolution4096 = 4096
    }

    /// <summary>
    /// Global Light Loop Settings.
    /// </summary>
    [Serializable]
    public struct GlobalLightLoopSettings
    {
        internal static readonly GlobalLightLoopSettings @default = default;
        /// <summary>Default GlobalDecalSettings</summary>
        internal static GlobalLightLoopSettings NewDefault() => new GlobalLightLoopSettings()
        {
            cookieAtlasSize = CookieAtlasResolution.CookieResolution2048,
            cookieFormat = CookieAtlasGraphicsFormat.R11G11B10,

            cookieAtlasLastValidMip = 0,

            // We must keep this value for migration purpose (when we create a new HDRP asset it is migrated to the last version)
#pragma warning disable 618 // Type or member is obsolete
            cookieTexArraySize = 1,
#pragma warning restore 618

            planarReflectionAtlasSize = PlanarReflectionAtlasResolution.Resolution1024,
            reflectionProbeCacheSize = 64,
            reflectionCubemapSize = CubeReflectionResolution.CubeReflectionResolution256,
            reflectionProbeFormat = ReflectionAndPlanarProbeFormat.R11G11B10,

            skyReflectionSize = SkyResolution.SkyResolution256,
            skyLightingOverrideLayerMask = 0,

            maxDirectionalLightsOnScreen = 16,
            maxPunctualLightsOnScreen = 512,
            maxAreaLightsOnScreen = 64,
            maxEnvLightsOnScreen = 64,
            maxDecalsOnScreen = 512,
            maxPlanarReflectionOnScreen = 16,
            maxLightsPerClusterCell = 8,
        };

        /// <summary>Cookie atlas resolution.</summary>
        [FormerlySerializedAs("cookieSize")]
        public CookieAtlasResolution cookieAtlasSize;
        /// <summary>Cookie atlas graphics format.</summary>
        public CookieAtlasGraphicsFormat cookieFormat;
#if UNITY_2020_1_OR_NEWER
#else
        /// <summary>Cookie atlas resolution for point lights.</summary>
        public CubeCookieResolution pointCookieSize;
#endif
        /// <summary>Last valid mip for cookie atlas.</summary>
        public int cookieAtlasLastValidMip;
        // We keep this property for the migration code (we need to know how many cookies we could have before).
        [SerializeField, Obsolete("There is no more texture array for cookies, use cookie atlases properties instead.")]
        internal int cookieTexArraySize;

        /// <summary>Planar reflections atlas resolution.</summary>
        [FormerlySerializedAs("planarReflectionTextureSize")]
        public PlanarReflectionAtlasResolution planarReflectionAtlasSize;
        /// <summary>Maximum number of cached reflection probes.</summary>
        public int reflectionProbeCacheSize;
        /// <summary>Reflection probes resolution.</summary>
        public CubeReflectionResolution reflectionCubemapSize;
        /// <summary>Enable reflection probe cache compression.</summary>
        public bool reflectionCacheCompressed;
        /// <summary>Reflection probes resolution.</summary>
        public ReflectionAndPlanarProbeFormat reflectionProbeFormat;

        /// <summary>Resolution of the sky reflection cubemap.</summary>
        public SkyResolution skyReflectionSize;
        /// <summary>LayerMask used for sky lighting override.</summary>
        public LayerMask skyLightingOverrideLayerMask;
        /// <summary>Enable fabric specific convolution for probes and sky lighting.</summary>
        public bool supportFabricConvolution;

        /// <summary>Maximum number of directional lights at the same time on screen.</summary>
        public int maxDirectionalLightsOnScreen;
        /// <summary>Maximum number of punctual lights at the same time on screen.</summary>
        public int maxPunctualLightsOnScreen;
        /// <summary>Maximum number of area lights at the same time on screen.</summary>
        public int maxAreaLightsOnScreen;
        /// <summary>Maximum number of environment lights at the same time on screen.</summary>
        public int maxEnvLightsOnScreen;
        /// <summary>Maximum number of decals at the same time on screen.</summary>
        public int maxDecalsOnScreen;
        /// <summary>Maximum number of planar reflections at the same time on screen.</summary>
        public int maxPlanarReflectionOnScreen;
        /// <summary>Maximum number of lights per ray tracing light cluster cell.</summary>
        public int maxLightsPerClusterCell;
    }
}