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

namespace IRaCIS.Core.Application.Helper
{

    #region 对接模型
    public class HolidayCalendar
    {
        public string Name { get; set; }
        public string Version { get; set; }
        public string Generated { get; set; }
        public string Timezone { get; set; }
        public string Author { get; set; }
        public string URL { get; set; }
        public Dictionary<string, List<HolidayYear>> Years { get; set; }
    }

    public class HolidayYear
    {
        public string Name { get; set; }
        public DateTime StartDate { get; set; }
        public DateTime EndDate { get; set; }
        public int Duration { get; set; }
        public List<DateTime> CompDays { get; set; }
        public string URL { get; set; }
        public string Memo { get; set; }
    }
    #endregion




    public class HolidayHelper
    {
        /// <summary>
        /// github 链接：https://github.com/lanceliao/china-holiday-calender?tab=readme-ov-file 
        /// 接口请求参考文档：https://www.koudingke.cn/docs/zh-Hans/net-lib-docs/latest/RestSharp/Usage/Usage
        /// </summary>
        private static RestClient _client => new RestClient("https://www.shuyz.com/githubfiles/china-holiday-calender/master/holidayAPI.json");

        private static HolidayCalendar _holidayCalendar { get; set; }


        private static List<DateTime> _holidays = new List<DateTime>();
        private static List<DateTime> _compensatedWorkdays = new List<DateTime>();

        static HolidayHelper()
        {
            _holidayCalendar = _client.Get<HolidayCalendar>(new RestRequest()) ?? new HolidayCalendar();

            foreach (var year in _holidayCalendar.Years.Values.SelectMany(x => x))
            {
                // 添加节假日到假日集合
                for (DateTime date = year.StartDate; date <= year.EndDate; date = date.AddDays(1))
                {
                    _holidays.Add(date);
                }

                // 添加补班日到补班日集合
                foreach (var compDay in year.CompDays)
                {
                    _compensatedWorkdays.Add(compDay);
                }
            }

        }

        public static TimeSpan GetChinaWorkTimeSpan(DateTime startDate, DateTime endDate)
        {
            if (startDate > endDate)
            {
                throw new ArgumentException("结束日期必须大于或等于开始日期");
            }

            var diffTimeSpan = endDate - startDate;

            // 初始化工作日数为0
            int workdays = 0;

            // 找出在给定日期范围内的假期和补班日
            var filteredHolidays = _holidays.Where(d => d >= startDate && d <= endDate).ToList();
            var filteredCompensatedWorkdays = _compensatedWorkdays.Where(d => d >= startDate && d <= endDate).ToList();

            // 遍历日期范围，计算工作日 注意 这里是小于
            for (DateTime date = startDate.Date; date < endDate.Date; date = date.AddDays(1))
            {
                // 判断是否为工作日
                bool isWeekend = date.DayOfWeek == DayOfWeek.Saturday || date.DayOfWeek == DayOfWeek.Sunday;
                bool isHoliday = filteredHolidays.Contains(date);
                bool isCompensatedWorkday = filteredCompensatedWorkdays.Contains(date);

                // 如果是补班日，或是平日（非假期，非周末），则算作工作日
                if (isCompensatedWorkday || (!isWeekend && !isHoliday))
                {
                    workdays++;
                }
            }

            return new TimeSpan(workdays, diffTimeSpan.Hours, diffTimeSpan.Minutes, diffTimeSpan.Seconds);


        }


    }
}