using System;

namespace XCEngine
{
    public abstract class ScriptableRendererData : Object
    {
        private ScriptableRendererFeature[] m_rendererFeatures;

        protected ScriptableRendererData()
        {
        }

        internal ScriptableRenderer CreateRendererInstance()
        {
            return CreateRenderer();
        }

        internal ScriptableRendererFeature[] CreateRendererFeaturesInstance()
        {
            return GetRendererFeatures();
        }

        internal void ConfigureCameraRenderRequestInstance(
            ScriptableRenderPipelineCameraRequestContext context)
        {
            ConfigureCameraRenderRequest(context);

            ScriptableRendererFeature[] rendererFeatures =
                GetRendererFeatures();
            for (int i = 0; i < rendererFeatures.Length; ++i)
            {
                ScriptableRendererFeature rendererFeature =
                    rendererFeatures[i];
                if (rendererFeature == null ||
                    !rendererFeature.isActive)
                {
                    continue;
                }

                rendererFeature.ConfigureCameraRenderRequest(
                    context);
            }
        }

        internal void ConfigureCameraFramePlanInstance(
            ScriptableRenderPipelinePlanningContext context)
        {
            ConfigureCameraFramePlan(context);

            ScriptableRendererFeature[] rendererFeatures =
                GetRendererFeatures();
            for (int i = 0; i < rendererFeatures.Length; ++i)
            {
                ScriptableRendererFeature rendererFeature =
                    rendererFeatures[i];
                if (rendererFeature == null ||
                    !rendererFeature.isActive)
                {
                    continue;
                }

                rendererFeature.ConfigureCameraFramePlan(
                    context);
            }
        }

        protected virtual ScriptableRenderer CreateRenderer()
        {
            return null;
        }

        protected virtual void ConfigureCameraRenderRequest(
            ScriptableRenderPipelineCameraRequestContext context)
        {
        }

        protected virtual void ConfigureCameraFramePlan(
            ScriptableRenderPipelinePlanningContext context)
        {
        }

        protected virtual ScriptableRendererFeature[] CreateRendererFeatures()
        {
            return Array.Empty<ScriptableRendererFeature>();
        }

        private ScriptableRendererFeature[] GetRendererFeatures()
        {
            if (m_rendererFeatures == null)
            {
                m_rendererFeatures =
                    CreateRendererFeatures() ??
                    Array.Empty<ScriptableRendererFeature>();
            }

            return m_rendererFeatures;
        }
    }
}