from __future__ import annotations

from datetime import datetime
from typing import Any

from sqlalchemy import DateTime, JSON, String, Text, func
from sqlalchemy.orm import Mapped, mapped_column

from app.core.database import Base


class GenerationCache(Base):
    __tablename__ = "generation_cache"

    cache_key: Mapped[str] = mapped_column(String(160), primary_key=True)
    task_type: Mapped[str] = mapped_column(String(80), index=True, nullable=False)
    provider: Mapped[str] = mapped_column(String(80), index=True, nullable=False)
    input_hash: Mapped[str] = mapped_column(String(128), index=True, nullable=False)
    output_json: Mapped[dict[str, Any] | None] = mapped_column(JSON, nullable=True)
    output_text: Mapped[str | None] = mapped_column(Text, nullable=True)
    output_file_path: Mapped[str | None] = mapped_column(String(1000), nullable=True)
    metadata_json: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict, nullable=False)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False,
    )
    expires_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)