Initial commit: MyBlog full stack blog
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"""
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数据库 ORM 模型模块。
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定义全局架构中的五个核心模型，以及邮箱验证码模型：
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- User：用户（visitor / friend / blogger）
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- Article：文章（public / friend 两种可见性）
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- Comment：评论（支持回复，parent_id 指向父评论）
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- Like：点赞
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- Friend：好友申请
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- EmailCode：邮箱验证码（一次性、带过期时间）
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"""
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from datetime import datetime, timezone
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from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Integer, String, Text, UniqueConstraint
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from sqlalchemy.orm import relationship
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from .database import Base
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# ---------- 常量定义 ----------
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# 用户角色（全局架构：visitor / friend / blogger）
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ROLE_VISITOR = "visitor"
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ROLE_FRIEND = "friend"
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ROLE_BLOGGER = "blogger"
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# 文章可见性（全局架构：public / friend）
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VISIBILITY_PUBLIC = "public"
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VISIBILITY_FRIEND = "friend"
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# 文章分区（life 生活 / study 学习）
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ARTICLE_CATEGORY_LIFE = "life"
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ARTICLE_CATEGORY_STUDY = "study"
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# 项目类型（L0 静态托管 / GitHub 外链）
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PROJECT_TYPE_STATIC = "static"
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PROJECT_TYPE_LINK = "link"
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# 好友申请状态
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FRIEND_STATUS_PENDING = "pending"
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FRIEND_STATUS_ACCEPTED = "accepted"
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FRIEND_STATUS_REJECTED = "rejected"
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# 邮箱验证码用途
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PURPOSE_REGISTER = "register"
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PURPOSE_RESET = "reset"
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def utcnow() -> datetime:
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"""返回当前 UTC 时间（无时区），作为各模型时间字段的默认值。"""
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return datetime.now(timezone.utc).replace(tzinfo=None)
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class User(Base):
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"""用户模型：对应权限系统的 visitor / friend / blogger 三种角色。"""
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__tablename__ = "users"
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id = Column(Integer, primary_key=True, index=True, comment="用户 ID")
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email = Column(String(255), unique=True, index=True, nullable=False, comment="邮箱，唯一")
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username = Column(String(50), unique=True, index=True, nullable=False, comment="用户名，唯一")
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password_hash = Column(String(255), nullable=False, comment="bcrypt 密码哈希，禁止保存明文")
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role = Column(String(20), nullable=False, default=ROLE_VISITOR, comment="角色")
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avatar = Column(String(500), nullable=True, comment="头像图片路径（uploads/avatar/）")
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avatar_updated_time = Column(DateTime, nullable=True, comment="头像最近一次更换时间（配合更换频率限制）")
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bio = Column(Text, nullable=True, comment="个人简介（我的简介页面展示）")
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token_version = Column(Integer, nullable=False, default=0, comment="令牌版本号（重置密码时自增，使旧 JWT 立即失效）")
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created_time = Column(DateTime, nullable=False, default=utcnow, comment="创建时间")
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# 关联关系：删除用户时级联删除其文章、评论、点赞与好友记录
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articles = relationship("Article", back_populates="author", cascade="all, delete-orphan")
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comments = relationship("Comment", back_populates="user", cascade="all, delete-orphan")
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likes = relationship("Like", back_populates="user", cascade="all, delete-orphan")
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friends = relationship("Friend", back_populates="user", cascade="all, delete-orphan")
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class Article(Base):
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"""文章模型：Markdown 正文，支持 public / friend 两种可见性。"""
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__tablename__ = "articles"
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id = Column(Integer, primary_key=True, index=True, comment="文章 ID")
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title = Column(String(200), nullable=False, comment="文章标题")
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content = Column(Text, nullable=False, comment="Markdown 格式正文")
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cover = Column(String(500), nullable=True, comment="文章封面图片路径（uploads/article/）")
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visibility = Column(String(20), nullable=False, default=VISIBILITY_PUBLIC, comment="可见性")
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category = Column(String(30), nullable=False, default=ARTICLE_CATEGORY_LIFE, index=True, comment="分区：life 生活 / study 学习")
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author_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True, comment="作者 ID")
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created_time = Column(DateTime, nullable=False, default=utcnow, comment="创建时间")
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author = relationship("User", back_populates="articles")
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comments = relationship("Comment", back_populates="article", cascade="all, delete-orphan")
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likes = relationship("Like", back_populates="article", cascade="all, delete-orphan")
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class Project(Base):
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"""项目模型：L0 静态托管（static，自动在线演示）或 GitHub 外链（link）。"""
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__tablename__ = "projects"
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id = Column(Integer, primary_key=True, index=True, comment="项目 ID")
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name = Column(String(100), nullable=False, comment="项目名称")
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description = Column(Text, nullable=True, comment="项目简介")
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tech = Column(String(500), nullable=True, comment="技术标签（逗号分隔）")
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project_type = Column(String(20), nullable=False, default=PROJECT_TYPE_STATIC, comment="项目类型：static 静态托管 / link 外链")
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visibility = Column(String(20), nullable=False, default=VISIBILITY_PUBLIC, comment="可见性：public 公开 / friend 好友")
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demo_url = Column(String(500), nullable=True, comment="在线运行地址（static 为站内演示地址，link 为 GitHub 链接）")
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download_url = Column(String(500), nullable=True, comment="下载文件地址（uploads/project/）")
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github_url = Column(String(500), nullable=True, comment="GitHub 仓库链接（link 类型必填）")
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created_time = Column(DateTime, nullable=False, default=utcnow, comment="创建时间")
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updated_time = Column(DateTime, nullable=False, default=utcnow, onupdate=utcnow, comment="更新时间")
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class Comment(Base):
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"""评论模型：好友及博主可对文章发表评论，支持回复（parent_id）。"""
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__tablename__ = "comments"
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id = Column(Integer, primary_key=True, index=True, comment="评论 ID")
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article_id = Column(Integer, ForeignKey("articles.id"), nullable=False, index=True, comment="文章 ID")
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user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True, comment="评论者 ID")
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parent_id = Column(Integer, ForeignKey("comments.id"), nullable=True, index=True, comment="父评论 ID（回复时填写，顶层评论为空）")
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content = Column(Text, nullable=False, comment="评论内容")
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created_time = Column(DateTime, nullable=False, default=utcnow, comment="创建时间")
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article = relationship("Article", back_populates="comments")
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user = relationship("User", back_populates="comments")
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parent = relationship("Comment", remote_side=[id], back_populates="replies")
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replies = relationship("Comment", back_populates="parent")
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class Like(Base):
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"""点赞模型：同一用户对同一文章只能点赞一次。"""
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__tablename__ = "likes"
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id = Column(Integer, primary_key=True, index=True, comment="点赞记录 ID")
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article_id = Column(Integer, ForeignKey("articles.id"), nullable=False, index=True, comment="文章 ID")
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user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True, comment="点赞者 ID")
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# 唯一约束：防止同一用户重复点赞同一文章
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__table_args__ = (
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UniqueConstraint("article_id", "user_id", name="uq_like_article_user"),
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)
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article = relationship("Article", back_populates="likes")
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user = relationship("User", back_populates="likes")
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class Friend(Base):
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"""好友申请模型：按已确认架构字段（id / user_id / status）实现。"""
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__tablename__ = "friends"
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id = Column(Integer, primary_key=True, index=True, comment="好友记录 ID")
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user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True, comment="申请人 ID")
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status = Column(String(20), nullable=False, default=FRIEND_STATUS_PENDING, comment="申请状态")
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created_time = Column(DateTime, nullable=False, default=utcnow, comment="申请创建时间")
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user = relationship("User", back_populates="friends")
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class EmailCode(Base):
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"""邮箱验证码模型：一次性验证码，带过期时间。"""
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__tablename__ = "email_codes"
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id = Column(Integer, primary_key=True, index=True, comment="验证码记录 ID")
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email = Column(String(255), index=True, nullable=False, comment="目标邮箱")
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code = Column(String(10), nullable=False, comment="验证码")
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purpose = Column(String(30), nullable=False, comment="用途：register / reset")
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expires_at = Column(DateTime, nullable=False, comment="过期时间")
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used = Column(Boolean, nullable=False, default=False, comment="是否已使用")
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created_time = Column(DateTime, nullable=False, default=utcnow, comment="创建时间")
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