import uuid

from sqlalchemy import ForeignKey, String, Text
from sqlalchemy.dialects.postgresql import JSONB, UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


class Message(Base):
    __tablename__ = "messages"

    chat_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("chats.id", ondelete="CASCADE"), nullable=False, index=True
    )
    role: Mapped[str] = mapped_column(String(20), nullable=False)
    content: Mapped[str] = mapped_column(Text, nullable=False)
    metadata_: Mapped[dict | None] = mapped_column("metadata", JSONB, nullable=True)

    chat: Mapped["Chat"] = relationship(back_populates="messages")  # noqa: F821