using XCEngine;
using XCEngine.Rendering;

namespace XCEngine.Rendering.Universal
{
    public abstract class ScriptableRendererFeature
    {
        private bool m_disposed;
        private bool m_runtimeCreated;
        private bool m_isActive = true;
        private int m_runtimeStateVersion = 1;
        private ScriptableRendererData m_owner;

        protected ScriptableRendererFeature()
        {
        }

        public bool isActive
        {
            get
            {
                return m_isActive;
            }
            set
            {
                if (m_isActive == value)
                {
                    return;
                }

                m_isActive = value;
                SetDirty();
            }
        }

        internal void BindOwnerInstance(
            ScriptableRendererData owner)
        {
            m_owner = owner;
        }

        internal int GetRuntimeStateVersionInstance()
        {
            return m_runtimeStateVersion;
        }

        internal void CreateInstance()
        {
            if (m_runtimeCreated)
            {
                return;
            }

            m_disposed = false;
            Create();
            m_runtimeCreated = true;
        }

        internal void ReleaseRuntimeResourcesInstance()
        {
            if (m_disposed ||
                !m_runtimeCreated)
            {
                return;
            }

            ReleaseRuntimeResources();
            m_disposed = true;
            m_runtimeCreated = false;
        }

        public virtual void Create()
        {
        }

        public virtual void ConfigureCameraRenderRequest(
            CameraRenderRequestContext context)
        {
        }

        public virtual void ConfigureCameraFramePlan(
            ScriptableRenderPipelinePlanningContext context)
        {
        }

        public virtual void ConfigureRenderSceneSetup(
            RenderSceneSetupContext context)
        {
        }

        public virtual void ConfigureDirectionalShadowExecutionState(
            DirectionalShadowExecutionContext context)
        {
        }

        public virtual void AddRenderPasses(
            ScriptableRenderer renderer,
            RenderingData renderingData)
        {
        }

        protected bool HasDirectionalShadow(
            CameraRenderRequestContext context)
        {
            return context != null &&
                   InternalCalls
                       .Rendering_CameraRenderRequestContext_GetHasDirectionalShadow(
                           context.nativeHandle);
        }

        protected void ClearDirectionalShadow(
            CameraRenderRequestContext context)
        {
            if (context == null)
            {
                return;
            }

            InternalCalls
                .Rendering_CameraRenderRequestContext_ClearDirectionalShadow(
                    context.nativeHandle);
        }

        protected virtual void ReleaseRuntimeResources()
        {
        }

        protected void SetDirty()
        {
            if (m_runtimeCreated &&
                !m_disposed)
            {
                ReleaseRuntimeResources();
            }

            m_disposed = false;
            m_runtimeCreated = false;

            unchecked
            {
                ++m_runtimeStateVersion;
            }

            if (m_runtimeStateVersion <= 0)
            {
                m_runtimeStateVersion = 1;
            }

            if (m_owner != null)
            {
                m_owner.InvalidateRendererFeaturesInstance();
            }
        }
    }
}