using Thousandto.Code.Center;
using System.Collections.Generic;
using UnityEngine;

namespace Thousandto.Code.Logic
{
    public class ItemDropEffectSystem
    {
        #region//私有变量
        private static Dictionary<ulong, int> _dropEntityTable = new Dictionary<ulong, int>();
        private static List<Vector2> _posList = new List<Vector2>();
        #endregion

        #region//构造函数
        static ItemDropEffectSystem()
        {
            //47	24	25	26	27	28	29
            //46	23	8	9	10	11	30
            //45	22	7	0	1	12	31
            //44	21	6		2	13	32
            //43	20	5	4	3	14	33
            //42	19	18	17	16	15	34
            //41	40	39	38	37	36	35

            _posList.Add(new Vector2(0, 1)); //0
            _posList.Add(new Vector2(1, 1)); //1
            _posList.Add(new Vector2(1, 0)); //2
            _posList.Add(new Vector2(1, -1)); //3
            _posList.Add(new Vector2(0, -1)); //4
            _posList.Add(new Vector2(-1, -1)); //5
            _posList.Add(new Vector2(-1, 0)); //6
            _posList.Add(new Vector2(-1, 1)); //7
            _posList.Add(new Vector2(-1, 2)); //8
            _posList.Add(new Vector2(0, 2)); //9
            _posList.Add(new Vector2(1, 2)); //10
            _posList.Add(new Vector2(2, 2)); //11
            _posList.Add(new Vector2(2, 1)); //12
            _posList.Add(new Vector2(2, 0)); //13
            _posList.Add(new Vector2(2, -1)); //14
            _posList.Add(new Vector2(2, -2)); //15
            _posList.Add(new Vector2(1, -2)); //16
            _posList.Add(new Vector2(0, -2)); //17
            _posList.Add(new Vector2(-1, -2)); //18
            _posList.Add(new Vector2(-2, -2)); //19
            _posList.Add(new Vector2(-2, -1)); //20
            _posList.Add(new Vector2(-2, 0)); //21
            _posList.Add(new Vector2(-2, 1)); //22
            _posList.Add(new Vector2(-2, 2)); //23
            _posList.Add(new Vector2(-2, 3)); //24
            _posList.Add(new Vector2(-1, 3)); //25
            _posList.Add(new Vector2(0, 3)); //26
            _posList.Add(new Vector2(1, 3)); //27
            _posList.Add(new Vector2(2, 3)); //28
            _posList.Add(new Vector2(3, 3)); //29
            _posList.Add(new Vector2(3, 2)); //30
            _posList.Add(new Vector2(3, 1)); //31
            _posList.Add(new Vector2(3, 0)); //32
            _posList.Add(new Vector2(3, -1)); //33
            _posList.Add(new Vector2(3, -2)); //34
            _posList.Add(new Vector2(3, -3)); //35
            _posList.Add(new Vector2(2, -3)); //36
            _posList.Add(new Vector2(1, -3)); //37
            _posList.Add(new Vector2(0, -3)); //38
            _posList.Add(new Vector2(-1, -3)); //39
            _posList.Add(new Vector2(-2, -3)); //40
            _posList.Add(new Vector2(-3, -3)); //41
            _posList.Add(new Vector2(-3, -2)); //42
            _posList.Add(new Vector2(-3, -1)); //43
            _posList.Add(new Vector2(-3, 0)); //44
            _posList.Add(new Vector2(-3, 1)); //45
            _posList.Add(new Vector2(-3, 2)); //46
            _posList.Add(new Vector2(-3, 3)); //47
        }
        #endregion

        #region//公有函数
        public static Vector2 CalculateDropPos(Character c)
        {
            if (c == null || GameCenter.GameSceneSystem.ActivedScene == null)
                return Vector2.zero;

            for (int i = 0; i < _posList.Count; ++i)
            {
                var pos = CalculateUnBolockDropPos(c);
                if (!GameCenter.GameSceneSystem.ActivedScene.navigator.IsBlocked(pos))
                {
                    return pos;
                }
            }

            return c.Position2d;
        }

        public static void Remove(ulong id)
        {
            _dropEntityTable.Remove(id);
        }

        public static int GetCurIndex(ulong id)
        {
            int index = 0;
            if(_dropEntityTable.TryGetValue(id, out index))
            {
                return index;
            }
            return 0;
        }
        #endregion

        #region//私有函数
        private static Vector2 CalculateUnBolockDropPos(Character c)
        {
            int index = 0;
            if (_dropEntityTable.TryGetValue(c.ID, out index))
            {
                ++index;
                if (index >= _posList.Count)
                {
                    index = 0;
                }
                _dropEntityTable[c.ID] = index;
            }
            else
            {
                index = 0;
                _dropEntityTable.Add(c.ID, index);
            }

            Vector2 pos = c.Position2d;
            pos.x += _posList[index].x * 2f;
            pos.y += _posList[index].y * 2f;
            return pos;
        }
        #endregion
    }
}