PIbd-22-Ismailov_SUBD/BlogDataModels/BlogDatabaseImplement/Model/Message.cs

using BlogContracts.BindingModels;
using BlogContracts.ViewModels;
using BlogDataModels;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace BlogDatabase.Models
{
    public class Message : IMessageModel
    {
        [Required]
        public string Text { get; set; } = string.Empty;

        [Required]
        public DateTime Date { get; set; } = DateTime.SpecifyKind(DateTime.MinValue, DateTimeKind.Utc);

        public int Id { get; private set; }

        [Required]
        public int UserId { get; set; }

        [Required]
        public int TopicId { get; set; }

        public virtual User? User { get; set; }

        public virtual Topic? Topic { get; set; }

        public static Message? Create(MessageBindingModel model)
        {
            if (model == null)
            {
                return null;
            }
            return new Message()
            {
                Id = model.Id,
                Text = model.Text,
                Date = model.Date,
                UserId = model.UserId,
                TopicId = model.TopicId,
            };
        }
        public void Update(MessageBindingModel model)
        {
            if (model == null)
            {
                return;
            }
            Text = model.Text;
            Date = model.Date;
        }
        public MessageViewModel GetViewModel => new()
        {
            Id = Id,
            Text = Text,
            Date = Date,
            TopicId = TopicId,
            UserId = UserId,
            Username = User == null ? string.Empty : User.Username,
            TopicName = Topic == null ? string.Empty : Topic.Name,
        };
    }
}