import enum
from datetime import datetime
from sqlalchemy import String, Text, Enum, ForeignKey, DateTime
from sqlalchemy.orm import Mapped, mapped_column, relationship
from app.database import Base


class MessageRole(str, enum.Enum):
    USER = "user"
    ASSISTANT = "assistant"


class ChatMessage(Base):
    __tablename__ = "chat_messages"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    project_id: Mapped[int] = mapped_column(ForeignKey("projects.id"), nullable=False)
    role: Mapped[MessageRole] = mapped_column(Enum(MessageRole), nullable=False)
    content: Mapped[str] = mapped_column(Text, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime, default=datetime.utcnow
    )

    # Relationships
    project = relationship("Project", back_populates="chat_messages")