import uuid
from datetime import datetime

from typing import Any

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

from api.models.base import Base, new_uuid


class TokenEvent(Base):
    __tablename__ = "token_events"
    __table_args__ = (
        UniqueConstraint(
            "measurement_kind",
            "source_provider",
            "source_id",
            name="uq_token_events_source_identity",
        ),
    )

    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)
    measurement_kind: Mapped[str] = mapped_column(
        Text, nullable=False, default="estimated", server_default="estimated", index=True
    )
    source_provider: Mapped[str] = mapped_column(
        Text, nullable=False, default="manual", server_default="manual", index=True
    )
    source_id: Mapped[str | None] = mapped_column(Text, nullable=True, index=True)
    source_path: Mapped[str | None] = mapped_column(Text, nullable=True)
    source_created_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True, index=True
    )
    ingested_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now(), nullable=False, index=True
    )
    parser_version: Mapped[str | None] = mapped_column(Text, nullable=True)
    confidence: Mapped[float] = mapped_column(
        Float, nullable=False, default=0.35, server_default="0.35"
    )
    cached_input_tokens: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0, server_default="0"
    )
    reasoning_output_tokens: Mapped[int] = mapped_column(
        Integer, nullable=False, default=0, server_default="0"
    )
    raw_total_tokens: Mapped[int | None] = mapped_column(Integer, nullable=True)
    cost_estimated_usd: Mapped[float | None] = mapped_column(Float, nullable=True)
    raw_metadata: Mapped[dict[str, Any]] = mapped_column(
        JSONB, nullable=False, default=dict, server_default="{}"
    )
    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