"""
数据库模型定义
"""
from datetime import datetime
from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, JSON, Boolean
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship

Base = declarative_base()


class User(Base):
    """用户表"""
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True)
    phone = Column(String(11), unique=True, nullable=False, index=True)
    created_at = Column(DateTime, default=datetime.utcnow)
    last_login_at = Column(DateTime, nullable=True)
    is_active = Column(Boolean, default=True)

    # 关联
    conversations = relationship("Conversation", back_populates="user")
    verification_codes = relationship("VerificationCode", back_populates="user")


class VerificationCode(Base):
    """验证码表"""
    __tablename__ = "verification_codes"

    id = Column(Integer, primary_key=True, index=True)
    phone = Column(String(11), nullable=False, index=True)
    code = Column(String(6), nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)
    expires_at = Column(DateTime, nullable=False)
    is_used = Column(Boolean, default=False)
    used_at = Column(DateTime, nullable=True)
    ip_address = Column(String(45), nullable=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=True)

    # 关联
    user = relationship("User", back_populates="verification_codes")


class Conversation(Base):
    """对话记录表"""
    __tablename__ = "conversations"

    id = Column(Integer, primary_key=True, index=True)
    session_id = Column(String(64), nullable=False, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)

    # 关联
    user = relationship("User", back_populates="conversations")
    messages = relationship("Message", back_populates="conversation", cascade="all, delete-orphan")


class Message(Base):
    """消息记录表"""
    __tablename__ = "messages"

    id = Column(Integer, primary_key=True, index=True)
    conversation_id = Column(Integer, ForeignKey("conversations.id"), nullable=False)
    role = Column(String(20), nullable=False)  # 'user' or 'assistant'
    content = Column(Text, nullable=False)
    msg_metadata = Column(JSON, nullable=True)  # 改名避免与SQLAlchemy保留字冲突
    created_at = Column(DateTime, default=datetime.utcnow)

    # 关联对话
    conversation = relationship("Conversation", back_populates="messages")


class UserPreference(Base):
    """用户偏好表"""
    __tablename__ = "user_preferences"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"), unique=True, nullable=False, index=True)
    preferences = Column(JSON, nullable=True)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    # 关联
    user = relationship("User")