using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Data;

namespace PDF_Master.DataConvert
{
    /// <summary>
    /// 用于注释 书签等的时间转换
    /// </summary>
    public class StringToDateConvert : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            string date = "";
            if (string.IsNullOrEmpty((string)value) || !Regex.IsMatch(value.ToString(), "(?<=D\\:)[0-9]+(?=[\\+\\-])"))
            {
                date = System.DateTime.Now.ToString("HH:mm");
            }
            else if (Regex.IsMatch(value.ToString(), "(?<=D\\:)[0-9]+(?=[\\+\\-])"))
            {
                string dateStr = Regex.Match(value.ToString(), "(?<=D\\:)[0-9]+(?=[\\+\\-])").Value;

                #region to do

                if (string.Equals(dateStr.Substring(4, 4), DateTime.Now.ToString("MMdd")))
                {//同天
                    date = dateStr.Substring(8, 2) + ":" + dateStr.Substring(10, 2);
                }
                else if (string.Equals(dateStr.Substring(0, 4), DateTime.Now.ToString("yyyy")))
                {//同年
                    date = dateStr.Substring(4, 2) + "/" + dateStr.Substring(6, 2) + " " + dateStr.Substring(8, 2) + ":" +
                   dateStr.Substring(10, 2);
                }
                else
                {
                    date = dateStr.Substring(0, 4) + "/" + dateStr.Substring(4, 2) + "/" + dateStr.Substring(6, 2) + " " + dateStr.Substring(8, 2) + ":" +
                    dateStr.Substring(10, 2);
                }

                #endregion to do

                //date = dateStr.Substring(4, 2) + "-" + dateStr.Substring(6, 2) + "   " + dateStr.Substring(8, 2) + ":" + dateStr.Substring(10, 2);
            }
            return date;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return null;
        }
    }

    //首页-最近列表时间格式
    public class RecentFileDateTimeToStringConvert : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null || value is DateTime == false || (DateTime)value == null)
                return null;

            string tag = "";
            var last = (DateTime)value;
            var now = System.DateTime.Now;
            //时间间隔
            //TimeSpan ts = (now - last).Duration();
            //7天之内
            bool isSameWeek = false;
            //bool isSameWeek = !(ts.TotalDays >= 7 || (DateTime.Compare(now, last) > 0 ? (now.DayOfWeek < last.DayOfWeek) : (now.DayOfWeek > last.DayOfWeek)));
            isSameWeek = WeekSpan(now, last);
            //同年同月
            if (now.Year == last.Year)
            { //同日
                if (now.Month == last.Month)
                {
                    if (now.Day == last.Day)
                    {
                        tag = "Today";
                    }
                    else if (isSameWeek)
                    {
                        tag = "week";
                    }
                }

            }

            string result = "";
            var cultureInfo = CultureInfo.InvariantCulture;
            CultureInfo cultureInfoEnglish = new CultureInfo("en-US");
            switch (tag)
            {
                case "Today":
                    result = "Today, " + last.Hour + ":" + last.Minute;
                    break;

                case "week":
                    string weekStr = DateTime.Parse(last.Date.ToString("yyyy-MM-dd"), cultureInfo).ToString("ddd", cultureInfoEnglish);
                    result = weekStr + ", " + last.Hour + ":" + last.Minute;
                    break;

                default:
                    string monthStr = DateTime.Parse(last.Date.ToString("yyyy-MM-dd"), cultureInfo).ToString("MMM", cultureInfoEnglish);
                    result = monthStr + " " + last.Day + ", " + last.Year;
                    break;
            }

            return result;

        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        public bool WeekSpan(DateTime now, DateTime last)
        {
            int ts = DateTime.Compare(now, last) > 0 ? (now.Day - last.Day) : (last.Day - now.Day);
            int a = DateTime.Compare(now, last) > 0 ? (now.DayOfWeek - last.DayOfWeek) : (last.DayOfWeek - now.DayOfWeek);
            if (ts == a) { return true; }
            return false;
        }
    }
}