"""ORM models for ChatFast."""

from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Integer, String, Text
from sqlalchemy.orm import relationship

from .db import Base, now_utc


class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True)
    username = Column(String(64), unique=True, nullable=False, index=True)
    password_hash = Column(String(128), nullable=False)
    salt = Column(String(32), nullable=False)
    role = Column(String(16), nullable=False, default="user")
    created_at = Column(DateTime, default=now_utc, nullable=False)
    updated_at = Column(DateTime, default=now_utc, onupdate=now_utc, nullable=False)

    sessions = relationship("ChatSession", back_populates="user", cascade="all, delete-orphan")


class ChatSession(Base):
    __tablename__ = "chat_sessions"

    id = Column(Integer, primary_key=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    user_session_no = Column(Integer, nullable=False, default=0)
    title = Column(String(128), nullable=True)
    archived = Column(Boolean, default=False, nullable=False)
    created_at = Column(DateTime, default=now_utc, nullable=False)
    updated_at = Column(DateTime, default=now_utc, nullable=False)

    user = relationship("User", back_populates="sessions")
    messages = relationship("ChatMessage", back_populates="session", cascade="all, delete-orphan")


class ChatMessage(Base):
    __tablename__ = "chat_messages"

    id = Column(Integer, primary_key=True)
    session_id = Column(
        Integer,
        ForeignKey("chat_sessions.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    role = Column(String(16), nullable=False)
    content = Column(Text, nullable=False)
    created_at = Column(DateTime, default=now_utc, nullable=False)

    session = relationship("ChatSession", back_populates="messages")


class AuthToken(Base):
    __tablename__ = "auth_tokens"

    token = Column(String(128), primary_key=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    expires_at = Column(DateTime, nullable=False)
    created_at = Column(DateTime, default=now_utc, nullable=False)

    user = relationship("User")


class ExportedContent(Base):
    __tablename__ = "exported_contents"

    id = Column(Integer, primary_key=True)
    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    source_session_id = Column(Integer, ForeignKey("chat_sessions.id", ondelete="SET NULL"), nullable=True)
    filename = Column(String(255), nullable=False)
    file_path = Column(String(500), nullable=False)
    content_preview = Column(Text, nullable=True)
    created_at = Column(DateTime, default=now_utc, nullable=False)

    user = relationship("User")