using System;
using System.Collections.Generic;
using System.Linq;

namespace Bootstrap.DataAccess
{
    /// <summary>
    /// 
    /// </summary>
    public class Message
    {
        /// <summary>
        /// 消息主键 数据库自增
        /// </summary>
        public string Id { get; set; }

        /// <summary>
        /// 标题
        /// </summary>
        public string Title { get; set; }

        /// <summary>
        /// 内容
        /// </summary>
        public string Content { get; set; }

        /// <summary>
        /// 发消息人
        /// </summary>
        public string From { get; set; }

        /// <summary>
        /// 收消息人
        /// </summary>
        public string To { get; set; }

        /// <summary>
        /// 消息发送时间
        /// </summary>
        public DateTime SendTime { get; set; }

        /// <summary>
        /// 消息状态：0-未读，1-已读 和Dict表的通知消息关联
        /// </summary>
        public string Status { get; set; }

        /// <summary>
        /// 标旗状态：0-未标旗，1-已标旗
        /// </summary>
        public int Mark { get; set; }

        /// <summary>
        /// 删除状态：0-未删除，1-已删除
        /// </summary>
        public int IsDelete { get; set; }

        /// <summary>
        /// 消息标签：0-一般，1-紧要 和Dict表的消息标签关联
        /// </summary>
        public string Label { get; set; }

        /// <summary>
        /// 获得/设置 标签名称
        /// </summary>
        public string LabelName { get; set; }

        /// <summary>
        /// 获得/设置 时间描述 2分钟内为刚刚
        /// </summary>
        public string Period { get; set; }

        /// <summary>
        /// 获得/设置 发件人头像
        /// </summary>
        public string FromIcon { get; set; }

        /// <summary>
        /// 获得/设置 发件人昵称
        /// </summary>
        public string FromDisplayName { get; set; }

        //TODO: SQL语句不兼容
        /// <summary>
        /// 所有有关userName所有消息列表
        /// </summary>
        /// <param name="userName"></param>
        /// <returns></returns>
        protected virtual IEnumerable<Message> Retrieves(string userName)
        {
            var db = DbManager.Create();
            var t = db.Provider.EscapeSqlIdentifier("To");
            var f = db.Provider.EscapeSqlIdentifier("From");
            return db.Fetch<Message>($"select m.*, d.Name, u.DisplayName from Messages m left join Dicts d on m.Label = d.Code and d.Category = @Category and d.Define = 0 inner join Users u on m.{f} = u.UserName where {t} = @UserName or {f} = @UserName order by SendTime desc", new { UserName = userName, Category = "消息标签" });
        }

        /// <summary>
        /// 收件箱
        /// </summary>
        /// <param name="userName"></param>
        public virtual IEnumerable<Message> Inbox(string userName)
        {
            var messageRet = Retrieves(userName);
            return messageRet.Where(n => n.To.Equals(userName, StringComparison.OrdinalIgnoreCase));
        }

        /// <summary>
        /// 发件箱
        /// </summary>
        /// <param name="userName"></param>
        /// <returns></returns>
        public virtual IEnumerable<Message> SendMail(string userName)
        {
            var messageRet = Retrieves(userName);
            return messageRet.Where(n => n.From.Equals(userName, StringComparison.OrdinalIgnoreCase));
        }

        /// <summary>
        /// 垃圾箱
        /// </summary>
        /// <param name="userName"></param>
        /// <returns></returns>
        public virtual IEnumerable<Message> Trash(string userName)
        {
            var messageRet = Retrieves(userName);
            return messageRet.Where(n => n.IsDelete == 1);
        }

        /// <summary>
        /// 标旗
        /// </summary>
        /// <param name="userName"></param>
        /// <returns></returns>
        public virtual IEnumerable<Message> Flag(string userName)
        {
            var messageRet = Retrieves(userName);
            return messageRet.Where(n => n.Mark == 1);
        }

        /// <summary>
        /// 获取Header处显示的消息列表
        /// </summary>
        /// <param name="userName"></param>
        /// <returns></returns>
        public virtual IEnumerable<Message> RetrieveHeaders(string userName)
        {
            var messageRet = Inbox(userName);
            messageRet.AsParallel().ForAll(n =>
            {
                var ts = DateTime.Now - n.SendTime;
                if (ts.TotalMinutes < 5) n.Period = "刚刚";
                else if (ts.Days > 0) n.Period = string.Format("{0}天", ts.Days);
                else if (ts.Hours > 0) n.Period = string.Format("{0}小时", ts.Hours);
                else if (ts.Minutes > 0) n.Period = string.Format("{0}分钟", ts.Minutes);
            });
            return messageRet;
        }
    }
}