import uuid
from datetime import datetime

from sqlalchemy import DateTime, ForeignKey, String, UniqueConstraint, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.models.base import Base, GUID


class Reaction(Base):
    __tablename__ = "reactions"
    __table_args__ = (
        UniqueConstraint("poste_id", "auteur_id", "type", name="uq_reaction_poste_auteur_type"),
    )

    id: Mapped[uuid.UUID] = mapped_column(GUID, primary_key=True, default=uuid.uuid4)
    poste_id: Mapped[uuid.UUID] = mapped_column(
        GUID,
        ForeignKey("postes.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    auteur_id: Mapped[uuid.UUID | None] = mapped_column(
        GUID,
        ForeignKey("utilisateurs.id", ondelete="SET NULL"),
        nullable=True,
        index=True,
    )
    type: Mapped[str] = mapped_column(String(30), default="LIKE", nullable=False)
    # Possible values: LIKE, HEART, SUPPORT
    date_creation: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False
    )

    poste: Mapped["Poste"] = relationship("Poste", back_populates="reactions")
    auteur: Mapped["Utilisateur | None"] = relationship("Utilisateur")


from app.models.poste import Poste  # noqa: E402, F401
from app.models.utilisateur import Utilisateur  # noqa: E402, F401