using System;
using UnityEngine;

namespace Thousandto.Launcher.Form
{
    /// <summary>
    /// 假进度处理
    /// </summary>
    public class UIFakeLoading
    {
        private UILoadingBasePanel _panel;
        //步骤数组
        private string[] _stepNames = null;
        //最大的步骤
        private int _maxStep = 0;
        //当前步骤
        private int _curentStep = -1;
        //当前值
        private float _currentValue = 0f;
        //最后的一个整数值
        private int _lastIntValue = 0;
        //最大的值
        private float _maxValue = 0.95f;

        //是否运行
        private bool _isRunning = false;

        //是否启动
        private bool _enabled = false;

        public bool Enabled {
            get
            {
                return _enabled;
            }
            set
            {
                if (_enabled != value)
                {
                    _enabled = value;
                    //Debug.LogError("FakeLoading::::Enable=" + _enabled);
                }
            }
        }

        public int MaxStep
        {
            get
            {
                return _maxStep;
            }
        }

        public string[] StepNames
        {
            get { return _stepNames; }
            set
            {
                if (value != null)
                {
                    _stepNames = value;
                }
                           
            }
        }

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

        public void Start(bool isReset)
        {
            //Debug.LogError("Start:::::::" + isReset);
            _isRunning = true;
            if (isReset)
            {
                Reset();
            }
        }

        public void Stop(bool isReset = false)
        {
            //Debug.LogError("Stop:::::::" + isReset);
            _isRunning = false;
            if (isReset)
            {
                Reset();
            }
        }

        //设置最大步骤
        public void SetMaxStep(int max)
        {
            _maxStep = max;
        }

       
        public void Reset()
        {
            _curentStep = -1;
            _lastIntValue = -1;
            _currentValue = 0;
            _panel.Reset();
        }

        //设置步骤
        public void SetStep(int step)
        {
            if (_curentStep != step)
            {
                _curentStep = step;
                if (step >= _maxStep)
                {
                    _curentStep = _maxStep - 1;
                }
                if (_curentStep >= 0)
                {
                    _maxValue = MaxValue();
                    if (_stepNames != null && _stepNames.Length > _curentStep)
                    {
                        _panel.SetStepName(_stepNames[_curentStep]);
                    }
                    _panel.SetProgressMinToMax(_curentStep + 1, _maxStep);
                }
                else
                {
                    _panel.SetStepName("");
                    _panel.SetProgressMinToMax(0,0);
                }
                _panel.Refresh();
            }
        }

        //更新
        public void Update(float deltaTime)
        {
            if (_enabled && _isRunning)
            {
                if (_currentValue < _maxValue)
                {
                    _currentValue += deltaTime * Speed();
                }
                _panel.SetProgress(_currentValue);
                _panel.Refresh();

            }
        }

        //计算最大值
        private float MaxValue()
        {
            if (_maxStep > 0 && _curentStep >=0)
            {
                return (float)(_curentStep+1) / (float)_maxStep * 0.05f + 0.95f;
            }
            return 1f;
        }

        //获取进度速度
        private float Speed()
        {
            //当速度越靠近最大值, 就越慢.
            return (_maxValue - _currentValue) * 0.2f + 0.15f;
        } 
    }
}