using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine.Analytics;
using UnityEngine;
using UnityEngine.Rendering;
using UnityEngine.Rendering.Universal;
using UnityEditor.Build;
using UnityEditor.Build.Reporting;

namespace UnityEditor.Rendering.Universal
{
    class UniversalAnalytics : IPostprocessBuildWithReport
    {
        static bool s_EventRegistered = false;
        const int k_MaxEventsPerHour = 1000;
        const int k_MaxNumberOfElements = 1000;
        const string k_VendorKey = "unity.universal";
        const string k_EventName = "uUniversalRenderPipelineUsage";

        static bool EnableAnalytics()
        {
            AnalyticsResult result = EditorAnalytics.RegisterEventWithLimit(k_EventName, k_MaxEventsPerHour, k_MaxNumberOfElements, k_VendorKey);
            if (result == AnalyticsResult.Ok)
                s_EventRegistered = true;

            return s_EventRegistered;
        }

        static void SendUniversalEvent()
        {
            //The event shouldn't be able to report if this is disabled but if we know we're not going to report
            //Lets early out and not waste time gathering all the data
            if (!EditorAnalytics.enabled)
                return;

            if (!EnableAnalytics())
                return;

            // Need to check if this isn't null
            UniversalRenderPipelineAsset rendererAsset = GraphicsSettings.currentRenderPipeline as UniversalRenderPipelineAsset;

            if (rendererAsset != null)
            {
                ScriptableRendererData[] rendererDataList = rendererAsset.m_RendererDataList;

                string mainLightMode = rendererAsset.mainLightRenderingMode.ToString();
                string additionalLightMode = rendererAsset.additionalLightsRenderingMode.ToString();

                HashSet<string> rendererDatas = new HashSet<string>();
                HashSet<string> renderFeatures = new HashSet<string>();
                int rendererDataAmount = 0;
                int rendererFeaturesAmount = 0;

                foreach (ScriptableRendererData rendererData in rendererDataList)
                {
                    if (rendererData != null)
                    {
                        rendererDataAmount++;
                        rendererDatas.Add(rendererData.GetType().ToString());
                        foreach (ScriptableRendererFeature rendererFeature in rendererData.rendererFeatures)
                        {
                            if (rendererFeature != null)
                            {
                                rendererFeaturesAmount++;
                                renderFeatures.Add(rendererFeature.GetType().ToString());
                            }
                        }
                    }
                }

                var data = new AnalyticsData()
                {
                    renderer_data = rendererDatas.ToArray(),
                    renderer_data_amount = rendererDataAmount,
                    renderer_features = renderFeatures.ToArray(),
                    renderer_features_amount = rendererFeaturesAmount,
                    main_light_rendering_mode = mainLightMode,
                    additional_light_rendering_mode = additionalLightMode,
                };

                EditorAnalytics.SendEventWithLimit(k_EventName, data);
            }
        }

        struct AnalyticsData
        {
            public string[] renderer_data;
            public int renderer_data_amount;
            public string[] renderer_features;
            public int renderer_features_amount;
            public string main_light_rendering_mode;
            public string additional_light_rendering_mode;
        }

        public int callbackOrder { get; }
        public void OnPostprocessBuild(BuildReport report)
        {
            SendUniversalEvent();
        }
    }
}