using System.ComponentModel.DataAnnotations;

namespace CampusErrand.Models;

/// <summary>
/// 系统消息表
/// </summary>
public class SystemMessage
{
    [Key]
    public int Id { get; set; }

    /// <summary>标题</summary>
    [MaxLength(128)]
    public string Title { get; set; } = string.Empty;

    /// <summary>正文（富文本）</summary>
    public string Content { get; set; } = string.Empty;

    /// <summary>缩略图</summary>
    [MaxLength(512)]
    public string? ThumbnailUrl { get; set; }

    /// <summary>目标类型</summary>
    public MessageTargetType TargetType { get; set; }

    /// <summary>指定用户 ID 列表（JSON）</summary>
    public string? TargetUserIds { get; set; }

    /// <summary>发布时间</summary>
    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
}