import uuid
from datetime import datetime

from sqlalchemy import String, Integer, Float, DateTime, ForeignKey, Index, func
from sqlalchemy import Uuid
from sqlalchemy.orm import Mapped, mapped_column

from app.database import Base, JSONType


class UsageRecord(Base):
    __tablename__ = "usage_records"

    id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        primary_key=True,
        default=uuid.uuid4,
    )
    user_id: Mapped[uuid.UUID] = mapped_column(
        Uuid(as_uuid=True),
        nullable=False,
        index=True,
    )
    brand_id: Mapped[uuid.UUID | None] = mapped_column(
        Uuid(as_uuid=True),
        ForeignKey("brands.id", ondelete="SET NULL"),
        nullable=True,
    )
    engine_type: Mapped[str] = mapped_column(
        String(20),
        nullable=False,
    )
    query: Mapped[str] = mapped_column(
        String(500),
        nullable=False,
    )
    input_tokens: Mapped[int] = mapped_column(
        Integer,
        default=0,
    )
    output_tokens: Mapped[int] = mapped_column(
        Integer,
        default=0,
    )
    cost: Mapped[float] = mapped_column(
        Float,
        default=0.0,
    )
    extra_data: Mapped[dict] = mapped_column(
        JSONType,
        default=dict,
    )
    timestamp: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=func.now(),
        index=True,
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )

    __table_args__ = (
        Index("idx_usage_records_user_engine", "user_id", "engine_type"),
        Index("idx_usage_records_user_timestamp", "user_id", "timestamp"),
        Index("idx_usage_records_engine_timestamp", "engine_type", "timestamp"),
    )