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

namespace IStation.Untity
{
    /// <summary>
    /// 数值列表辅助类
    /// </summary>
    public class DoubleListHelper
    {
        //分割字符
        private const string _split = ",";

        /// <summary>
        /// 转化为字符串
        /// </summary>
        public static string ToString(IEnumerable<double> list)
        {
            if (list == null || list.Count() < 1)
                return string.Empty;
            return string.Join(_split, list);
        }

        /// <summary>
        /// 转化为列表
        /// </summary>
        public static List<double> ToList(string str)
        {
            if (string.IsNullOrEmpty(str))
                return new List<double>();
            try
            {
                var list = str.Split(new string[] { _split }, StringSplitOptions.RemoveEmptyEntries);
                if (list.Count() < 1)
                    return default;
                return list.Select(x => Convert.ToDouble(x)).ToList();
            }
            catch
            {
                return new List<double>();
            }
        }

        /// <summary>
        /// 转化为字符串
        /// </summary>
        public static string ToEmptyString(IEnumerable<double?> list)
        {
            if (list == null || list.Count() < 1)
                return string.Empty;
            return string.Join(_split, list);
        }

        /// <summary>
        /// 转化为列表
        /// </summary>
        public static List<double?> ToEmptyList(string str)
        {
            if (string.IsNullOrEmpty(str))
                return new List<double?>();
            try
            {
                var list = str.Split(new string[] { _split }, StringSplitOptions.RemoveEmptyEntries);
                if (list.Count() < 1)
                    return default;
                var number = new List<double?>();
                for (int i = 0; i < list.Count(); i++)
                {
                    var item = list[i];
                    if (double.TryParse(item, out double result))
                        number.Add(result);
                    else
                        number.Add(null);
                }
                return number;
            }
            catch
            {
                return new List<double?>();
            }
        }
         
    }
}