using Cal;
using System;
using System.Collections.Generic;
using System.IO;

namespace ET
{
    public static class SkillHelper
    {
        public static async ETTask<byte[]> GetSkillConfig()
        {
            string path = "../Config/Skill/SkillConfig.bytes";
            return await File.ReadAllBytesAsync(path);
        }
        public static async ETTask<byte[]> GetSkillBuffConfig()
        {
            string path = "../Config/Skill/BuffConfig.bytes";
            return await File.ReadAllBytesAsync(path);
        }
        public static async ETTask<byte[]> GetSkillLogicConfig()
        {
            string path = "../Config/Skill/SkillLogicConfig.bytes";
            return await File.ReadAllBytesAsync(path);
        }

        /// <summary>
        /// 从一个迭代器中获取指定条件，指定数量的元素，返回数组类型
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="source">源数据</param>
        /// <param name="list">临时列表</param>
        /// <param name="indexList">临时索引列表</param>
        /// <param name="match">条件表达式</param>
        /// <param name="targetCount">需要的数量</param>
        /// <returns></returns>
        public static T[] SelectTarget<T>(IEnumerable<T> source, List<T> list, List<int> indexList, Func<T, bool> match, int targetCount, T firstT = null)
            where T : class
        {
            if (firstT != null)
            {
                targetCount--;
            }
            T[] ret = new T[targetCount];

            if (source == null) return null;
            list.Clear();
            foreach (T item in source)
            {
                if (item != firstT)
                    if (match(item))
                    {
                        list.Add(item);
                    }
            }

            int sourceCount = list.Count;
            if (sourceCount == 0)
                return null;
            if (sourceCount <= targetCount)
            {
                for (int i = 0; i < list.Count; i++)
                {
                    ret[i] = list[i];
                }
                return ret;
            }
            indexList.Clear();
            for (int i = 0; i < sourceCount; i++)
                indexList.Add(i);
            int site = sourceCount;//设置下限
            int id;
            for (int j = 0; j < targetCount; j++)
            {
                //返回0到site - 1之中非负的一个随机数
                id = RandomHelper.RandomNumber(0, site);
                //在随机位置取出一个数，保存到结果数组
                ret[j] = list[indexList[id]];
                //最后一个数复制到当前位置
                indexList[id] = indexList[site - 1];
                //位置的下限减少一
                site--;
            }

            return ret;
        }


        public static bool GetParam(SkillParam skillParam, int skillId, out float value)
        {
            value = 0;
            if (skillParam == null)
                return true;
            switch (skillParam.skillSourcetype)
            {
                case SkillSourcetype.Changable:
                    skillParam.values.TryGetValue(skillId % 100, out value);
                    return true;
                default:
                case SkillSourcetype.None:
                    value = 0;
                    return false;
                case SkillSourcetype.Constage:
                    value = skillParam.value;
                    return true;
            }
        }

        //private static readonly List<int> indexList = new List<int>();
        //private static readonly List<Unit> tempList = new List<Unit>();
        ///// <summary>
        ///// 从sourceList中选取count个随机目标
        ///// </summary>
        //public static void SelectUnits(List<Unit> sourceList, Unit selectUnit, int targetCount)
        //{

        //    if (sourceList == null || sourceList.Count == 0) return;

        //    var sourceCount = sourceList.Count;

        //    if (sourceCount <= targetCount)
        //    {
        //        return;
        //    }
        //    tempList.Clear();
        //    indexList.Clear();

        //    tempList.AddRange(sourceList);
        //    sourceList.Clear();

        //    if (selectUnit != null)
        //    {
        //        targetCount--;
        //        sourceList.Add(selectUnit);
        //    }


        //    for (int i = 0; i < sourceCount; i++)
        //        indexList.Add(i);
        //    int site = sourceCount;//设置下限
        //    for (int j = 0; j < targetCount; j++)
        //    {
        //        //返回0到site - 1之中非负的一个随机数
        //        int id = RandomHelper.RandomNumber(0, site);
        //        //在随机位置取出一个数，保存到结果数组
        //        sourceList.Add(tempList[indexList[id]]);

        //        //最后一个数复制到当前位置
        //        indexList[id] = indexList[site - 1];
        //        //位置的下限减少一
        //        site--;
        //    }
        //}
        public static int RandomNumber(int skillId, SkillParam minCount, SkillParam maxCount, bool isRnadom = true)
        {
            if (!SkillHelper.GetParam(maxCount, skillId, out float max))
            {
                Log.Error($"数据填写不完整，the id of skill is {skillId}");
                return 1;
            }
            float min = 1;
            if(isRnadom && !SkillHelper.GetParam(minCount, skillId, out min))
            {
                Log.Error($"数据填写不完整，the id of skill is {skillId}");
            }
            return isRnadom ? RandomHelper.RandomNumber((int)min, (int)max + 1) : (int)max;
        }
    }
}