﻿using UnityEditor.Rendering;
using UnityEngine.Rendering.Universal;
using System.Reflection;
using UnityEditor;

[VolumeComponentEditor(typeof(MosaicSettings))]
public class MosaicEditor : VolumeComponentEditor
{
    SerializedDataParameter enabled;
    SerializedDataParameter overlayTexture;
    SerializedDataParameter overlayColor;
    SerializedDataParameter xTileCount;
    SerializedDataParameter usePointFiltering;

    public override void OnEnable()
    {
        var o = new PropertyFetcher<MosaicSettings>(serializedObject);
        enabled = Unpack(o.Find(x => x.enabled));
        overlayTexture = Unpack(o.Find(x => x.overlayTexture));
        overlayColor = Unpack(o.Find(x => x.overlayColor));
        xTileCount = Unpack(o.Find(x => x.xTileCount));
        usePointFiltering = Unpack(o.Find(x => x.usePointFiltering));
    }

    public override void OnInspectorGUI()
    {
        if (!CheckEffectEnabled())
        {
            EditorGUILayout.HelpBox("The Mosaic effect must be added to your renderer's Renderer Features list.", MessageType.Error);
        }

        PropertyField(enabled);
        PropertyField(overlayTexture);
        PropertyField(overlayColor);
        PropertyField(xTileCount);
        PropertyField(usePointFiltering);
    }

    // Check the Forward Renderer and make sure the Mosaic effect is attached.
    private bool CheckEffectEnabled()
    {
        if (UniversalRenderPipeline.asset == null)
        {
            return false;
        }

        ScriptableRendererData forwardRenderer =
            ((ScriptableRendererData[])typeof(UniversalRenderPipelineAsset)
            .GetField("m_RendererDataList", BindingFlags.NonPublic | BindingFlags.Instance)
            .GetValue(UniversalRenderPipeline.asset))[0];

        foreach (ScriptableRendererFeature item in forwardRenderer.rendererFeatures)
        {
            if (item?.GetType() == typeof(Mosaic))
            {
                return true;
            }
        }

        return false;
    }

    public override string GetDisplayTitle()
    {
        return "Mosaic";
    }
}
