/// 照片域模型（P3 计划 Task 2）：管理端照片记录与照片枚举。
///
/// 契约来源：`packages/contracts/openapi.yaml` tag `photos`。
library;

import '../albums/models.dart' show SignedUrl;

/// 照片对外可见性。
///
/// 契约 `components.schemas.PhotoVisibility`：unpublished/published/hidden/
/// deleted；deleted 为软删除。管理端 PATCH /photos/{photoId} 仅允许在
/// hidden 与 published 间切换。
enum PhotoVisibility {
  unpublished('unpublished'),
  published('published'),
  hidden('hidden'),
  deleted('deleted');

  const PhotoVisibility(this.wire);

  /// 线上（JSON）取值。
  final String wire;

  static PhotoVisibility fromJson(String value) => values.firstWhere(
        (v) => v.wire == value,
        orElse: () => throw FormatException('未知 PhotoVisibility: $value'),
      );
}

/// 照片服务端处理状态。
///
/// 契约 `components.schemas.PhotoProcessingState`（技术实施方案 §5.5
/// 「服务端处理」链路）。
enum PhotoProcessingState {
  pendingUpload('pending_upload'),
  uploaded('uploaded'),
  processing('processing'),
  ready('ready'),
  processingFailed('processing_failed');

  const PhotoProcessingState(this.wire);

  /// 线上（JSON）取值。
  final String wire;

  static PhotoProcessingState fromJson(String value) => values.firstWhere(
        (v) => v.wire == value,
        orElse: () => throw FormatException('未知 PhotoProcessingState: $value'),
      );
}

/// 管理端照片记录。
///
/// 契约 `components.schemas.PhotoRecord`（技术实施方案 §4 photos 表字段）。
/// 作为 GET /albums/{albumId}/photos 条目时经 [AdminPhoto] 内嵌 uploader；
/// PATCH /photos/{photoId}（operationId `updatePhoto`）的响应为裸
/// PhotoRecord。
class PhotoRecord {
  const PhotoRecord({
    required this.photoId,
    required this.albumId,
    required this.categoryId,
    required this.uploaderId,
    required this.visibility,
    required this.processingState,
    required this.bytes,
    required this.width,
    required this.height,
    required this.shotAt,
    required this.uploadedAt,
    required this.publishedAt,
    required this.likeCount,
  });

  factory PhotoRecord.fromJson(Map<String, dynamic> json) => PhotoRecord(
        photoId: json['photoId'] as String,
        albumId: json['albumId'] as String,
        categoryId: json['categoryId'] as String?,
        uploaderId: json['uploaderId'] as String,
        visibility: PhotoVisibility.fromJson(json['visibility'] as String),
        processingState:
            PhotoProcessingState.fromJson(json['processingState'] as String),
        bytes: json['bytes'] as int,
        width: json['width'] as int?,
        height: json['height'] as int?,
        shotAt: json['shotAt'] == null
            ? null
            : DateTime.parse(json['shotAt'] as String),
        uploadedAt: DateTime.parse(json['uploadedAt'] as String),
        publishedAt: json['publishedAt'] == null
            ? null
            : DateTime.parse(json['publishedAt'] as String),
        likeCount: json['likeCount'] as int,
      );

  /// 照片 ID。
  final String photoId;

  /// 所属相册 ID。
  final String albumId;

  /// 分类 ID；null 表示未分类。
  final String? categoryId;

  /// 上传人用户 ID。
  final String uploaderId;

  /// 对外可见性。
  final PhotoVisibility visibility;

  /// 服务端处理状态。
  final PhotoProcessingState processingState;

  /// 原图字节数。
  final int bytes;

  /// 原图宽度（像素）；处理前为 null。
  final int? width;

  /// 原图高度（像素）；处理前为 null。
  final int? height;

  /// 拍摄时间（EXIF）；无有效值时为 null。
  final DateTime? shotAt;

  /// 上传完成时间。
  final DateTime uploadedAt;

  /// 发布时间；未发布为 null。
  final DateTime? publishedAt;

  /// 累计点赞数。
  final int likeCount;

  Map<String, dynamic> toJson() => {
        'photoId': photoId,
        'albumId': albumId,
        'categoryId': categoryId,
        'uploaderId': uploaderId,
        'visibility': visibility.wire,
        'processingState': processingState.wire,
        'bytes': bytes,
        'width': width,
        'height': height,
        'shotAt': shotAt?.toUtc().toIso8601String(),
        'uploadedAt': uploadedAt.toUtc().toIso8601String(),
        'publishedAt': publishedAt?.toUtc().toIso8601String(),
        'likeCount': likeCount,
      };
}

/// 管理列表条目内嵌的上传人脱敏信息。
///
/// 契约 `components.schemas.AdminPhotoUploader`（不含邮箱、手机等凭据字段）。
class AdminPhotoUploader {
  const AdminPhotoUploader({
    required this.userId,
    required this.account,
    required this.displayName,
  });

  factory AdminPhotoUploader.fromJson(Map<String, dynamic> json) =>
      AdminPhotoUploader(
        userId: json['userId'] as String,
        account: json['account'] as String,
        displayName: json['displayName'] as String,
      );

  /// 上传人用户 ID（与 PhotoRecord.uploaderId 一致）。
  final String userId;

  /// 登录账号。
  final String account;

  /// 展示姓名（来自用户资料）。
  final String displayName;

  Map<String, dynamic> toJson() => {
        'userId': userId,
        'account': account,
        'displayName': displayName,
      };
}

/// 管理照片列表数据范围（UI-01，listAlbumPhotos scope 查询参数）。
///
/// all=本相册全部照片（缺省，仅 owner/admin）；own=仅当前用户上传（任何
/// 有效成员，服务端过滤）。
enum AlbumPhotoScope {
  all('all'),
  own('own');

  const AlbumPhotoScope(this.wire);

  /// 线上（JSON）取值。
  final String wire;

  static AlbumPhotoScope fromJson(String value) => values.firstWhere(
        (v) => v.wire == value,
        orElse: () => throw FormatException('未知 AlbumPhotoScope: $value'),
      );
}

/// 管理端照片预览（UI-01）。
///
/// 契约 `components.schemas.PhotoPreview`：thumb/browse 短期签名 URL。
/// 有权限（admin 全部 / 相册 owner 本相册 / 协作者仅自己上传）且有有效
/// 变体、未删除才签发；隐藏照片仅 admin/owner。无预览时条目 preview 为
/// null（PhotoRecord 记录本身不受影响）。
class PhotoPreview {
  const PhotoPreview({required this.thumb, required this.browse});

  factory PhotoPreview.fromJson(Map<String, dynamic> json) => PhotoPreview(
        thumb: SignedUrl.fromJson(json['thumb'] as Map<String, dynamic>),
        browse: SignedUrl.fromJson(json['browse'] as Map<String, dynamic>),
      );

  /// 缩略图签名 URL。
  final SignedUrl thumb;

  /// 浏览图签名 URL。
  final SignedUrl browse;

  Map<String, dynamic> toJson() => {
        'thumb': thumb.toJson(),
        'browse': browse.toJson(),
      };
}

/// 管理端照片列表条目。
///
/// 契约 `components.schemas.AdminPhoto`（= PhotoRecord + uploader 内嵌 +
/// preview 可选扩展），GET /albums/{albumId}/photos（operationId
/// `listAlbumPhotos`）的条目。preview（UI-01）：无权签发/无变体/已删除为
/// null；旧响应缺键同样解析为 null。
class AdminPhoto extends PhotoRecord {
  const AdminPhoto({
    required this.uploader,
    required super.photoId,
    required super.albumId,
    required super.categoryId,
    required super.uploaderId,
    required super.visibility,
    required super.processingState,
    required super.bytes,
    required super.width,
    required super.height,
    required super.shotAt,
    required super.uploadedAt,
    required super.publishedAt,
    required super.likeCount,
    this.preview,
  });

  factory AdminPhoto.fromJson(Map<String, dynamic> json) => AdminPhoto(
        uploader: AdminPhotoUploader.fromJson(
          json['uploader'] as Map<String, dynamic>,
        ),
        photoId: json['photoId'] as String,
        albumId: json['albumId'] as String,
        categoryId: json['categoryId'] as String?,
        uploaderId: json['uploaderId'] as String,
        visibility: PhotoVisibility.fromJson(json['visibility'] as String),
        processingState:
            PhotoProcessingState.fromJson(json['processingState'] as String),
        bytes: json['bytes'] as int,
        width: json['width'] as int?,
        height: json['height'] as int?,
        shotAt: json['shotAt'] == null
            ? null
            : DateTime.parse(json['shotAt'] as String),
        uploadedAt: DateTime.parse(json['uploadedAt'] as String),
        publishedAt: json['publishedAt'] == null
            ? null
            : DateTime.parse(json['publishedAt'] as String),
        likeCount: json['likeCount'] as int,
        preview: json['preview'] == null
            ? null
            : PhotoPreview.fromJson(json['preview'] as Map<String, dynamic>),
      );

  /// 上传人脱敏信息。
  final AdminPhotoUploader uploader;

  /// 受权限管理的照片预览（UI-01）；无权/无变体/已删除为 null。
  final PhotoPreview? preview;

  @override
  Map<String, dynamic> toJson() => {
        ...super.toJson(),
        'uploader': uploader.toJson(),
        'preview': preview?.toJson(),
      };
}