using System;
using System.Collections.Generic;

using System.Text;
using UnityEngine;

namespace Thousandto.Code.Logic
{
    /// <summary>
    /// 滑屏操作的处理器
    /// </summary>
    public class SlashHandler
    {
        #region//常量定义
        //滑屏的最远距离
        public const float CN_SLASH_DIS_MAX = 30.0f;
        #endregion

        #region//私有变量
        //开始滑屏的位置
        private Vector2 _startSlashPos = Vector2.zero;
        //结束滑屏的位置
        private Vector2 _endSlashPos = Vector2.zero;
        //记录滑屏的帧数
        private int _slashFrameCounter = 0;
        //滑屏的最小距离
        private float _slashMinimumDis = Screen.height * 0.15f;
        //滑屏的最小速度
        private float _slashMinimumSpeed = Screen.height;      
        //滑屏开始的时间
        private float _startSlashTime = 0.0f;
        //结束滑屏的时间
        private float _endSlashTime = 0.0f;
        //是否能够激活滑屏操作
        private bool _enableSlash = false;
        #endregion

        #region//属性信息
        //当前是否能够滑屏
        public bool EnableSlash
        {
            get { return _enableSlash; }
            set { _enableSlash = value; }
        }
        #endregion

        #region//公共方法接口
        public void Refresh()
        {
            _enableSlash = false;
        }

        public void Reset()
        {
 
        }

        //滑屏开始
        public void SlashBegin(Vector2 startPos)
        {            
            _enableSlash = true;
            OnSlash_InitData(startPos);
        }
        //滑屏移动
        public void SlashMove(Vector2 fingerPos, Vector2 delta)
        {
            OnSlash_UpdateData(fingerPos);
        }

        //滑屏结束
        public void SlashEnd(Vector2 fingerPos)
        {
            OnSlash_UpdateData(fingerPos);
            OnSlash_ResetData();
        }
        #endregion

        #region //私有方法
        // 开始滑屏时的初始化处理
        private void OnSlash_InitData(Vector2 startPos)
        {
            // start slash
            _startSlashTime = Time.time;
            _startSlashPos = startPos;
            _endSlashPos = _startSlashPos;
            _slashFrameCounter++;
        }
        //滑屏过程当中的处理
        private void OnSlash_UpdateData(Vector2 endPos)
        {
            _endSlashTime = Time.time;
            _endSlashPos = endPos;
            _slashFrameCounter++;
            if (_enableSlash)
            {
                Vector2 slashDir = _endSlashPos - _startSlashPos;
                float slashDis = slashDir.magnitude;
                if (slashDis > CN_SLASH_DIS_MAX)
                {                    
                    OnSlash_ResetData();
                }
            }
        }

        //恢复数据
        private void OnSlash_ResetData()
        {
            // reset all vars
            _slashFrameCounter = 0;
            _startSlashPos = Vector2.zero;
            _endSlashPos = Vector2.zero;
            _startSlashTime = 0.0f;
            _endSlashTime = 0.0f;
        }
        #endregion
    }
}