using System;
using AlicizaX.Resource.Runtime;
using AlicizaX.Event.Runtime;
using AlicizaX.Runtime;
using UnityEngine;


namespace Unity.Startup.Procedure
{
    public static class LauncherUIHandler
    {
        public static void Start()
        {
            GameApp.Event.Subscribe(AssetDownloadProgressUpdateEventArgs.EventId, SetProgressUpdate);
        }

        public static void Dispose()
        {
        }

        public static void ShowLogText(string text)
        {
            Log.Info("TipText:{0}", text);
        }

        private static float _lastUpdateDownloadedSize;
        private static float _totalSpeed;
        private static int _speedSampleCount;
        private static long _currentDownloadBytes;

        private static float CurrentSpeed
        {
            get
            {
                float interval = Math.Max(Time.deltaTime, 0.01f); // 防止deltaTime过小
                var sizeDiff = _currentDownloadBytes - _lastUpdateDownloadedSize;
                _lastUpdateDownloadedSize = _currentDownloadBytes;
                var speed = sizeDiff / interval;

                // 使用滑动窗口计算平均速度
                _totalSpeed += speed;
                _speedSampleCount++;
                return _totalSpeed / _speedSampleCount;
            }
        }

        public static void SetProgressUpdate(object sender, GameEventArgs gameEventArgs)
        {
            var message = (AssetDownloadProgressUpdateEventArgs)gameEventArgs;
            _currentDownloadBytes = message.CurrentDownloadSizeBytes;
            float progress = message.CurrentDownloadSizeBytes / (message.TotalDownloadSizeBytes * 1f);
            string currentSizeMb = Utility.File.GetBytesSize(message.CurrentDownloadSizeBytes);
            string totalSizeMb = Utility.File.GetBytesSize(message.TotalDownloadSizeBytes);
            string speed = Utility.File.GetLengthString((int)CurrentSpeed);


            string line1 = Utility.Text.Format("正在更新，已更新 {0}/{1} ({2:F2}%)", message.CurrentDownloadCount, message.TotalDownloadCount, progress);
            string line2 = Utility.Text.Format("已更新大小 {0}MB/{1}MB", currentSizeMb, totalSizeMb);
            string line3 = Utility.Text.Format("当前网速 {0}/s，剩余时间 {1}", speed, GetRemainingTime(message.TotalDownloadSizeBytes, message.CurrentDownloadSizeBytes, CurrentSpeed));


            Log.Info($"{line1} \n {line2}\n {line3}");
        }

        private static string GetRemainingTime(long totalBytes, long currentBytes, float speed)
        {
            int needTime = 0;
            if (speed > 0)
            {
                needTime = (int)((totalBytes - currentBytes) / speed);
            }

            TimeSpan ts = new TimeSpan(0, 0, needTime);
            return ts.ToString(@"mm\:ss");
        }
    }
}