import uuid
from datetime import datetime

from sqlalchemy import DateTime, ForeignKey, Integer, Text, func
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from api.models.base import Base, new_uuid


class TokenEvent(Base):
    __tablename__ = "token_events"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=new_uuid
    )
    task_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("tasks.id", ondelete="SET NULL"), nullable=True, index=True
    )
    workstream_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("workstreams.id", ondelete="SET NULL"), nullable=True, index=True
    )
    repo_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("managed_repos.id", ondelete="SET NULL"), nullable=True, index=True
    )
    session_id: Mapped[str | None] = mapped_column(Text, nullable=True)
    model: Mapped[str | None] = mapped_column(Text, nullable=True)
    tokens_in: Mapped[int] = mapped_column(Integer, nullable=False)
    tokens_out: Mapped[int] = mapped_column(Integer, nullable=False)
    agent: Mapped[str | None] = mapped_column(Text, nullable=True)
    ref_type: Mapped[str | None] = mapped_column(Text, nullable=True)
    ref_id: Mapped[str | None] = mapped_column(Text, nullable=True)
    note: Mapped[str | None] = mapped_column(Text, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False, index=True
    )

    task: Mapped["Task | None"] = relationship("Task", lazy="selectin")  # noqa: F821
    workstream: Mapped["Workstream | None"] = relationship("Workstream", lazy="selectin")  # noqa: F821
    repo: Mapped["ManagedRepo | None"] = relationship("ManagedRepo", lazy="selectin")  # noqa: F821