using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Bowin.Common.Utility;

namespace EMIS.ViewModel
{
    public static class WeekNumHelper
    {
        public static string GetWeekNumString(this List<int?> WeekNumList)
        {
            int i;
            var orderedWeekNumList = WeekNumList.OrderBy(x => x).ToList();
            bool isSingle = true;
            bool isDouble = true;
            int minWeekNum = WeekNumList.Min() ?? 0;
            int maxWeekNum = WeekNumList.Max() ?? 0;
            for (i = 0; i < orderedWeekNumList.Count; i++)
            {
                int curWeekNum = orderedWeekNumList[i] ?? 0;
                if (curWeekNum == 0)
                {
                    isSingle = false;
                    isDouble = false;
                    break;
                }
                if (curWeekNum != minWeekNum + (i * 2))
                {
                    isSingle = false;
                    isDouble = false;
                    break;
                }
                //判断单周
                if (curWeekNum % 2 != 1)
                {
                    isSingle = false;
                }
                //判断双周
                if (curWeekNum % 2 != 0)
                {
                    isDouble = false;
                }
            }
            if (minWeekNum == 0 && maxWeekNum == 0)
            {
                return "";
            }
            if (isSingle)
            {
                return minWeekNum.ToString() + "-" + maxWeekNum.ToString() + "单周";
            }
            if (isDouble)
            {
                return minWeekNum.ToString() + "-" + maxWeekNum.ToString() + "双周";
            }

            return string.Join(",", EnumerableEx.MergeInt(orderedWeekNumList));
        }
    }
}