using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.TestTools;
using UnityEngine.Rendering;
using UnityEngine.SceneManagement;
using NUnit.Framework;

namespace UnityEngine.Rendering.Tests
{
    class RuntimeProfilerTestBase
    {
        protected const int k_NumWarmupFrames = 10;
        protected const int k_NumFramesToRender = 30;

        protected DebugFrameTiming m_DebugFrameTiming;
        protected GameObject m_ToCleanup;

        [SetUp]
        public void Setup()
        {
            if (!FrameTimingManager.IsFeatureEnabled())
                Assert.Ignore("Frame timing stats are disabled in Player Settings, skipping test.");

            if (Application.isBatchMode)
                Assert.Ignore("Frame timing tests are not supported in batch mode, skipping test.");

            // HACK #1 - really shouldn't have to do this here, but previous tests are leaking gameobjects
            var objects = GameObject.FindObjectsOfType<GameObject>();
            foreach (var o in objects)
            {
                // HACK #2 - must not destroy DebugUpdater, which happens to have an EventSystem.
                if (o.GetComponent<EventSystem>() == null)
                    CoreUtils.Destroy(o);
            }

            m_DebugFrameTiming = new DebugFrameTiming();
        }

        [TearDown]
        public void TearDown()
        {
            if (m_ToCleanup != null)
                CoreUtils.Destroy(m_ToCleanup);
        }

        protected IEnumerator Warmup()
        {
            for (int i = 0; i < k_NumWarmupFrames; i++)
                yield return null;

            m_DebugFrameTiming.Reset();
        }
    }

    // [UnityPlatform(exclude = new RuntimePlatform[] { RuntimePlatform.LinuxPlayer, RuntimePlatform.LinuxEditor })] // Disabled on Linux (case 1370861)
    // class RuntimeProfilerTests : RuntimeProfilerTestBase
    // {
    //     [UnityTest]
    //     public IEnumerator RuntimeProfilerGivesNonZeroOutput()
    //     {
    //         yield return Warmup();

    //         m_ToCleanup = new GameObject();
    //         var camera = m_ToCleanup.AddComponent<Camera>();
    //         for (int i = 0; i < k_NumFramesToRender; i++)
    //         {
    //             m_DebugFrameTiming.UpdateFrameTiming();
    //             camera.Render();
    //             yield return null;
    //         }

    //         Assert.True(
    //             m_DebugFrameTiming.m_BottleneckHistory.Histogram.Balanced > 0 ||
    //             m_DebugFrameTiming.m_BottleneckHistory.Histogram.CPU > 0 ||
    //             m_DebugFrameTiming.m_BottleneckHistory.Histogram.GPU > 0 ||
    //             m_DebugFrameTiming.m_BottleneckHistory.Histogram.PresentLimited > 0);
    //     }
    // }
}