/// This file is a part of RSS Bot for Telegram.
/// License: MIT
/// Author: CrazyHackGUT aka Kruzya (Sergey Gut) <kruzefag@gmail.com>
/// 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;

namespace Kruzya.TelegramBot.RichSiteSummary.Data
{
    /// <summary>
    /// Represents a feed in database.
    /// </summary>
    public class Feed : RepresentableEntity
    {
        #region RepresentableEntity
        protected override string ViewableText
        {
            get => Title;
        }

        protected override string ViewableUrl
        {
            get => HomePage;
        }
        #endregion

        /// <summary>
        /// The unique feed id.
        /// </summary>
        [Key]
        public Guid FeedId { get; set; }
        
        /// <summary>
        /// The feed URL.
        /// </summary>
        [Required]
        public string Url { get; set; }
        
        /// <summary>
        /// The home page for this feed.
        /// </summary>
        [Required]
        public string HomePage { get; set; }
        
        /// <summary>
        /// Feed title.
        /// </summary>
        [MaxLength(256)]
        [Required]
        public string Title { get; set; }
        
        /// <summary>
        /// DateTime when feed fetched successfully in last time.
        /// </summary>
        [Required]
        public DateTime UpdatedAt { get; set; }
        
        /// <summary>
        /// This flag indicates, bot should monitor changes in post date, or not.
        /// </summary>
        [Required]
        [DefaultValue(false)]
        public bool WatchPostDate { get; set; }
        
        public Feed()
        {
            FeedId = new Guid();
            UpdatedAt = DateTime.Now;
        }

        /// <summary>
        /// All posts from this feed.
        /// </summary>
        public virtual ICollection<Post> Posts { get; set; }
        
        /// <summary>
        /// All exists subscriber for this feed.
        /// </summary>
        public virtual ICollection<Subscriber> Subscribers { get; set; }
    }
}