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

namespace IStation.Model.Monitor 
{
    /// <summary>
    /// 周段
    /// </summary>
    public class WeekSlot : JsonModel<WeekSlot>, ICronSlot
    {
        /// <summary>
        /// 是否从前一周开始
        /// </summary>
        public bool Pre { get; set; } = false;

        /// <summary>
        /// 开始天数 周一到周日 1-7
        /// </summary>
        public int Start { get; set; } = 1;

        /// <summary>
        /// 结束天数 周一到周日 1-7
        /// </summary>
        public int End { get; set; } = 7;

        /// <summary>
        /// 验证
        /// </summary>
        public bool Verify()
        {
            if (this.Start < 1 || this.Start > 7)
                return false;
            if (this.End < 1 || this.End > 7)
                return false;
            var start = this.Start;
            var end = this.End;
            if (this.Pre)
            {
                end += 7;
            }
            if (end - start > 6)
                return false;
            if (end - start < 1)
                return false;
            return true;
        }

        /// <summary>
        /// 获取开始时间
        /// </summary>
        public DateTime GetStartTime(DateTime rhs)
        {
            var start = 1;
            if (Verify())
            {
                start = this.Start;
                if (Pre)
                    start = start - 7;
            }
            var dayOfWeek = (int)rhs.DayOfWeek;
            if (dayOfWeek == 0)
                dayOfWeek = 7;
            var startWeek = rhs.AddDays(1 - dayOfWeek);
            var dt = startWeek.AddDays(-1);
            dt = dt.AddDays(-7);
            dt = dt.Date;
            dt = dt.AddDays(start);
            return dt;
        }

        /// <summary>
        /// 获取结束时间
        /// </summary>
        public DateTime GetEndTime(DateTime rhs)
        {
            var end = 7;
            if (Verify())
                end = this.End;
            var dayOfWeek = (int)rhs.DayOfWeek;
            if (dayOfWeek == 0)
                dayOfWeek = 7;
            var startWeek = rhs.AddDays(1 - dayOfWeek);
            var dt = startWeek.Date;
            dt = dt.AddDays(-7);
            dt = dt.AddDays(end);
            return dt;
        }

    }
}