using System;

namespace Thousandto.Launcher.Form
{
    /// <summary>
    /// 下载进度的处理
    /// </summary>
    public class UIDownloading
    {
        private UILoadingBasePanel _panel;
        //每秒倒计时
        private float _perSecondTimer;
        //速度
        private int _speed = 0;
        //旧进度，用来计算下载速度的
        private int _oldProgressValue;

        //已经下载
        private int _downSize;
        //总的数量
        private int _totalSize;     

        private System.Func<bool> _onRunningHandler;
        private bool _enabled;
        private string _stepName;

        //展示下载的样式
        private bool _showDownloadStyle = true;

        public bool ShowDownloadStyle
        {
            get {
                return _showDownloadStyle;
            }
            set
            {
                _showDownloadStyle = value;
            }
        }

        public int DownSize
        {
            get
            {
                return _downSize;
            }

            set
            {
                _downSize = value;
            }
        }

        public int TotalSize
        {
            get
            {
                return _totalSize;
            }

            set
            {
                _totalSize = value;
            }
        }
           

        public Func<bool> OnRunningHandler
        {
            get
            {
                return _onRunningHandler;
            }

            set
            {
                _onRunningHandler = value;
            }
        }

        public bool Enabled
        {
            get
            {
                return _enabled;
            }

            set
            {
                _enabled = value;
            }
        }

        public string StepName
        {
            get
            {
                return _stepName;
            }

            set
            {
                _stepName = value;
            }
        }

        public UIDownloading(UILoadingBasePanel panel)
        {
            _panel = panel;            
        }

        public void Update(float deltaTime)
        {
            if (_enabled)
            {
                _perSecondTimer += deltaTime;
                if (_perSecondTimer >= 1.0f)
                {
                    _perSecondTimer = 0;
                }

                if (_onRunningHandler != null && _onRunningHandler())
                {
                    Refresh();
                }
            }
        }

        /// <summary>
        /// 刷新信息
        /// </summary>  
        public void Refresh()
        {
            if (_oldProgressValue == 0)
                _oldProgressValue = _downSize;

            if (_perSecondTimer == 0)
            {
                _speed = _perSecondTimer == 0 ? (_downSize - _oldProgressValue) / 1024 : 0;
                _oldProgressValue = _downSize;

                if (_speed < 0)
                    _speed = 0;
            }

            float percetage = _totalSize <= 0 ? 1 : _downSize / (float)_totalSize;

            _panel.SetSpeed(_speed);
            _panel.SetProgress(percetage);
            _panel.SetUseDownload(_showDownloadStyle);
            _panel.SetProgressMinToMax(_downSize, _totalSize);
            _panel.SetStepName(_stepName);
            _panel.Refresh();
        }
    }
}