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

[VolumeComponentEditor(typeof(SobelOutlineSettings))]
public class SobelOutlineEditor : VolumeComponentEditor
{
    SerializedDataParameter enabled;
    SerializedDataParameter threshold;
    SerializedDataParameter outlineColor;
    SerializedDataParameter backgroundColor;

    public override void OnEnable()
    {
        var o = new PropertyFetcher<SobelOutlineSettings>(serializedObject);
        enabled = Unpack(o.Find(x => x.enabled));
        threshold = Unpack(o.Find(x => x.threshold));
        outlineColor = Unpack(o.Find(x => x.outlineColor));
        backgroundColor = Unpack(o.Find(x => x.backgroundColor));
    }

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

        PropertyField(enabled);
        PropertyField(threshold);
        PropertyField(outlineColor);
        PropertyField(backgroundColor);
    }

    // Check the Forward Renderer and make sure the SobelOutline 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(SobelOutline))
            {
                return true;
            }
        }

        return false;
    }

    public override string GetDisplayTitle()
    {
        return "Outline (Sobel)";
    }
}
