from typing import Optional
from datetime import datetime, timezone

from sqlalchemy import Column, String, Text, Integer, DateTime, ForeignKey, JSON, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.models.user import Base


class Conversation(Base):
    __tablename__ = "conversations"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    conversation_id: Mapped[str] = mapped_column(String(64), unique=True, nullable=False, index=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=False)
    title: Mapped[Optional[str]] = mapped_column(String(256))
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )

    messages: Mapped[list["Message"]] = relationship(back_populates="conversation")


class Message(Base):
    __tablename__ = "messages"

    id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
    conversation_id: Mapped[str] = mapped_column(
        ForeignKey("conversations.conversation_id"), nullable=False, index=True
    )
    role: Mapped[str] = mapped_column(String(32), nullable=False)  # user / assistant
    content: Mapped[str] = mapped_column(Text, nullable=False)
    intent: Mapped[Optional[str]] = mapped_column(String(32))
    sources: Mapped[Optional[dict]] = mapped_column(JSON)
    feedback: Mapped[Optional[str]] = mapped_column(String(32))  # like / dislike / null
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )

    conversation: Mapped["Conversation"] = relationship(back_populates="messages")