using UnityEngine;
using System.Collections.Generic ;
using System;


    //集合或数组的助手类
    public static class CollectionHelper
    {
        //升序排列
        public static void OrderBy<T,TKey>(T[] array,SelectHandler<T,TKey> handler)
           where TKey : IComparable<TKey>
        {
            for (int i = 0; i < array.Length -1; i++)
                for (int j = i+1; j < array.Length ; j++)
                    if (handler(array[i]).CompareTo(handler(array[j])) > 0)
                    {
                        var temp = array[i];
                        array[i] = array[j];
                        array[j] = temp;
                    }
        }

        //降序排列
        public static void OrderByDescending<T, TKey>(T[] array, SelectHandler<T, TKey> handler)
            where TKey : IComparable 
        {
            for (int i = 0; i < array.Length - 1; i++)
                for (int j = i + 1; j < array.Length; j++)
                    if (handler(array[i]).CompareTo(handler(array[j])) < 0)
                    {
                        var temp = array[i];
                        array[i] = array[j];
                        array[j] = temp;
                    }
        }

        public delegate bool FindHandler<T>(T item);
        public delegate TKey SelectHandler<TSource,TKey>(TSource source);
        //查找
        public static T Find<T>(T[] array, FindHandler<T> handler)
        {
            foreach (var item in array)
            {
                //调用委托
                if (handler(item))
                    return item;
            }
            return default(T);
        }

    //查找
    public static T Find<T>(List<T> list, FindHandler<T> handler)
    {
        foreach (var item in list)
        {
            //调用委托
            if (handler(item))
                return item;
        }
        return default(T);
    }

    //查找
    public static T[] FindAll<T>(T[] array, FindHandler<T> handler)
        {
            List<T> tempList = new List<T>();
            foreach (var item in array)
            {
                //调用委托
                if (handler(item))
                    tempList.Add(item);
            }
            return tempList.Count > 0 ? tempList.ToArray() : null;
        }

        public static TKey[] Select<T,TKey>(T[] array,
            SelectHandler<T,TKey> handler)
        {
            TKey[] tempArr = new TKey[array.Length];
            for (int i = 0; i < array.Length ; i++)
            {
                tempArr[i] =handler(array[i]);
            }
            return tempArr;
        }
    }