"""Provenance tracking."""

from __future__ import annotations

from dataclasses import dataclass
from datetime import datetime


@dataclass(slots=True)
class ProvenanceRecord:
    source: str
    source_type: str
    fetched_at: str
    transform: str

    def to_dict(self) -> dict[str, str]:
        return {
            "source": self.source,
            "source_type": self.source_type,
            "fetched_at": self.fetched_at,
            "transform": self.transform,
        }


def make_provenance(source: str, source_type: str, transform: str) -> ProvenanceRecord:
    return ProvenanceRecord(
        source=source,
        source_type=source_type,
        fetched_at=datetime.utcnow().isoformat(),
        transform=transform,
    )