using System;
using System.Diagnostics;
using FlaxEngine;
using FlaxEngine.GUI;

namespace Game
{
    [ExecuteInEditMode]
    public class PerformanceWidget : Script
    {
        private const double updateInterval = 0.25;

        public UIControl control;
        private Label label;

        private Stopwatch stopwatch;

        private double updateTimeAvg;
        private ulong updateTimeCount;

        public override void OnAwake()
        {
            label = (Label)control.Control;
            label.Text = $"0fps";
            control.HideFlags = HideFlags.None;

            stopwatch = Stopwatch.StartNew();
        }

        public override void OnUpdate()
        {
            updateTimeCount++;
            double elapsed = stopwatch.Elapsed.TotalSeconds;
            if (elapsed >= updateInterval)
            {
                stopwatch.Restart();
                updateTimeAvg = elapsed / updateTimeCount;
                updateTimeCount = 0;

                label.Text = $"{(int)Math.Round(1.0f / updateTimeAvg)}fps";
            }

#if false
#if BUILD_DEVELOPMENT
			var nameOffset = Marshal.OffsetOf(typeof(ProfilerCPU.Event), "Name0");
			foreach (var eventsCpu in FlaxEngine.ProfilingTools.EventsCPU)
			{
				sb.Append("\nName: " + eventsCpu.Name + " ");
				foreach (var eventt in eventsCpu.Events)
				{
#if FLAX_EDITOR
					string eventName = eventt.Name;
#else
					string eventName;
					unsafe
					{
						var ptr1 = &eventt;
						char* ptr2 = (char*)(new IntPtr((byte*)ptr1 + nameOffset.ToInt64()));
						//fixed (char* name = &eventt)
						{
							eventName = new string(ptr2);
						}
					}
#endif

					sb.Append(eventName + " " + (eventt.End-eventt.Start) + "ms, ");
				}

			}
#endif
#endif
        }
    }
}