using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace XYY.Core.Standard.ExtendMethods
{
    public static class StringExtendMethods
    {
        public static string[] ToArray(this string str, int maxLength)
        {
            string[] arr = str.Split(' ', '.', ',');
            if (arr.Any(x => x.Length >= maxLength))
            {
                var a = arr.Where(x => x.Length > maxLength);
                throw new Exception($"拆分错误，尝试拆分地址{str}->{string.Join("+", a)}时，发现对于拆分长度{maxLength}，无法拆分，请添加相应空格，逗号，句号处理");
            }

            int page = ((str.Length + maxLength) - 1) / maxLength;
            List<string> addressArr = new List<string>();

            int flag = 0;
            int t = arr.Count(); int i = 0;
            do
            {
                addressArr.Add("");
                string temp = "";
                for (int j = 0; j < t; j++)
                {
                    string splitor = j < t - 1 ? " " : String.Empty;//如果是最后一截，则不要加空格;
                    if ((temp += arr[flag] + splitor).Length <= maxLength)
                    {
                        addressArr[i] += arr[flag] + splitor;
                        arr[flag] = null;
                        flag++;
                    }
                }
                t = arr.Count() - flag;
                i++;
            }
            while (arr.Any(x => x != null));
            if (arr.Any(x => x != null))
                throw new Exception("地址拆分失败");
            return addressArr.ToArray();
        }


        public static string[] ToArray2(this string str, int maxLength)
        {
            string[] arr = str.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
            int page = ((str.Length + maxLength) - 1) / maxLength;
            string[] addressArr = new string[page];

            int flag = 0;
            int t = arr.Count();
            for (int i = 0; i < page; i++)
            {
                string temp = "";
                for (int j = 0; j < t; j++)
                {
                    string splitor = j < t - 1 ? " " : String.Empty;//如果是最后一截，则不要加空格;
                    if ((temp += arr[flag] + splitor).Length <= maxLength)
                    {
                        addressArr[i] += arr[flag] + splitor;
                        flag++;
                    }
                }
                t = arr.Count() - flag;
            }
            return addressArr;
        }
    }
}