using Microsoft.EntityFrameworkCore;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace FileShare_EFCore.Models
{
    /// <summary>
    /// 文件缩略图映射记录，存储视频缩略图的文件路径与内容类型。
    /// </summary>
    [Comment("文件缩略图映射记录")]
    [Table("managed-thumbnail-map")]
    public class ManagedThumbnailMap
    {
        /// <summary>主键 ID。</summary>
        [Key]
        [Column("id")]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        /// <summary>所属根目录 ID。</summary>
        [Column("library-root-id")]
        public int LibraryRootId { get; set; }

        /// <summary>缩略图相对于缩略图存储根目录的路径。</summary>
        [Column("relative-path")]
        [MaxLength(1024)]
        public string RelativePath { get; set; } = string.Empty;

        /// <summary>缩略图的 MIME 类型。</summary>
        [Column("content-type")]
        [MaxLength(100)]
        public string ContentType { get; set; } = "image/jpeg";

        /// <summary>创建时间 UTC。</summary>
        [Column("created-at")]
        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;

        /// <summary>更新时间 UTC。</summary>
        [Column("updated-at")]
        public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;

        /// <summary>所属根目录。</summary>
        public ManagedLibraryRoot? LibraryRoot { get; set; }

        /// <summary>引用了此缩略图的文件记录。</summary>
        public List<ManagedFileRecord> Files { get; set; } = new();
    }
}