546 lines
20 KiB
Python
546 lines
20 KiB
Python
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from collections.abc import Sequence
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from datetime import datetime, timedelta
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from decimal import Decimal
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from typing import Any
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from app.domain.attributes import select_attribute_snapshot
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from app.domain.constraints import evaluate_constraint
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from app.domain.enums import (
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Availability,
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ConstraintStatus,
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Eligibility,
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PriceReferenceScope,
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)
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from app.domain.models import (
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AttributeDefinition,
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AttributeStatement,
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ConstraintResult,
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EvaluationResult,
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GateResult,
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Offer,
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PriceObservation,
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Product,
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ProductVariant,
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Profile,
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Reason,
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ScoreComponent,
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ScoringModel,
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)
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from app.domain.serialize import jsonable
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from app.scoring.deal import classification_for, derive_eligible, eligibility_from_parts, score_deal
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from app.scoring.mathutil import round_score
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from app.scoring.price import (
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build_offer_reference_history,
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price_statistics_from_windows,
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score_price,
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select_current_observation,
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)
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from app.scoring.product import score_product
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def evaluate_deal(
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*,
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profile: Profile,
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scoring_model: ScoringModel,
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product: Product,
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variant: ProductVariant,
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offer: Offer,
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attributes: tuple[AttributeStatement, ...],
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observations: tuple[PriceObservation, ...],
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definitions: dict[str, AttributeDefinition],
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as_of: datetime,
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snapshot_cutoff: datetime,
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engine_build: str,
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) -> EvaluationResult:
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observations = tuple(item for item in observations if item.offer_id == offer.id)
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snapshot = select_attribute_snapshot(attributes, as_of=as_of, snapshot_cutoff=snapshot_cutoff)
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constraint_results = tuple(
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evaluate_constraint(
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constraint,
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snapshot.get(constraint.attribute),
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definitions[constraint.attribute],
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scoring_model.minimum_confidence,
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)
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for constraint in profile.constraints
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)
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product_gates, product_eligibility = _product_eligibility(profile, product, constraint_results)
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product_score_raw, coverage, preference_components = score_product(
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profile.preferences,
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snapshot,
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constraint_results,
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scoring_model,
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)
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current = select_current_observation(observations, as_of=as_of, snapshot_cutoff=snapshot_cutoff)
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offer_gates, offer_eligibility = _offer_eligibility(profile, offer, current, scoring_model, as_of)
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overall = eligibility_from_parts(product_eligibility, offer_eligibility)
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windows: dict[int, Any] = {}
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price_score_raw: Decimal | None = None
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budget_score: Decimal | None = None
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history_score: Decimal | None = None
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price_basis = None
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history_warning: str | None = None
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if _can_score_price(current, profile, scoring_model, as_of):
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windows = build_offer_reference_history(observations, current, scoring_model)
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price_score_raw, budget_score, history_score, price_basis, history_warning = score_price(
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current_price=current.total_price,
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reference_history=windows[90].values,
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budget=profile.budget,
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model=scoring_model,
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)
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stats = price_statistics_from_windows(current, windows)
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deal_score_raw = None
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if overall == Eligibility.ELIGIBLE and price_score_raw is not None:
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deal_score_raw = score_deal(product_score_raw, price_score_raw, scoring_model)
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classification = classification_for(overall, deal_score_raw, scoring_model)
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reasons, warnings = _reasons(
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constraint_results,
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product_gates,
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offer_gates,
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stats,
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current,
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history_warning,
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price_score_raw,
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)
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components = _all_components(
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preference_components,
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product_gates,
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offer_gates,
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budget_score,
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history_score,
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scoring_model,
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)
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input_snapshot = {
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"profile": profile.definition,
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"scoring_model": scoring_model.definition,
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"product": jsonable(_product_dict(product)),
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"variant": jsonable(_variant_dict(variant)),
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"offer": jsonable(_offer_dict(offer)),
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"attribute_snapshot": {
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key: jsonable(_attribute_dict(value))
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for key, value in snapshot.items()
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},
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"current_observation": None if current is None else jsonable(_observation_dict(current)),
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"history_observation_ids": [str(item) for item in stats.used_observation_ids],
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"as_of": jsonable(as_of),
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"snapshot_cutoff": jsonable(snapshot_cutoff),
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"price_reference_scope": PriceReferenceScope.OFFER.value,
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"unrounded": {
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"product_score": jsonable(product_score_raw),
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"price_score": jsonable(price_score_raw),
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"deal_score": jsonable(deal_score_raw),
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"budget_score": jsonable(budget_score),
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"history_score": jsonable(history_score),
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},
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}
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return EvaluationResult(
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profile_id=profile.id,
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profile_version=profile.version,
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scoring_version=scoring_model.version,
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scoring_hash=scoring_model.definition_hash,
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engine_build=engine_build,
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variant_id=variant.id,
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offer_id=offer.id,
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as_of=as_of,
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snapshot_cutoff=snapshot_cutoff,
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product_eligibility=product_eligibility,
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offer_eligibility=offer_eligibility,
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overall_eligibility=overall,
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eligible=derive_eligible(overall),
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product_score=round_score(product_score_raw),
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product_score_raw=product_score_raw,
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price_score=None if price_score_raw is None else round_score(price_score_raw),
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price_score_raw=price_score_raw,
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deal_score=None if deal_score_raw is None else round_score(deal_score_raw),
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deal_score_raw=deal_score_raw,
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classification=classification,
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price_basis=price_basis,
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product_coverage=coverage,
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constraint_results=constraint_results,
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product_gates=product_gates,
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offer_gates=offer_gates,
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components=components,
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price_statistics=stats,
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price_reference_scope=PriceReferenceScope.OFFER,
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reasons=reasons,
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warnings=warnings,
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input_snapshot=input_snapshot,
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failed_constraints=tuple(
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item for item in constraint_results if item.status == ConstraintStatus.FAIL.value
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),
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unknown_constraints=tuple(
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item for item in constraint_results if item.status == ConstraintStatus.UNKNOWN.value
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),
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)
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def statement_price_confidence(observation: PriceObservation, model: ScoringModel) -> bool:
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return observation.confidence >= model.minimum_confidence
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def _fresh_enough(observation: PriceObservation, as_of: datetime, model: ScoringModel) -> bool:
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return as_of - observation.observed_at <= timedelta(hours=model.maximum_price_age_hours)
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def _product_eligibility(
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profile: Profile,
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product: Product,
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constraint_results: tuple[ConstraintResult, ...],
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) -> tuple[tuple[GateResult, ...], Eligibility]:
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category_ok = product.category == profile.category
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category_gate = GateResult(
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key="category",
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status="PASS" if category_ok else "FAIL",
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reason_code="CATEGORY_MATCH" if category_ok else "CATEGORY_MISMATCH",
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details={"expected": profile.category, "actual": product.category},
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)
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mandatory = [item for item in constraint_results if item.mandatory]
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if not category_ok or any(item.status == ConstraintStatus.FAIL.value for item in mandatory):
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eligibility = Eligibility.INELIGIBLE
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elif any(item.status == ConstraintStatus.UNKNOWN.value for item in mandatory):
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eligibility = Eligibility.UNKNOWN
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else:
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eligibility = Eligibility.ELIGIBLE
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return (category_gate,), eligibility
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def _offer_eligibility(
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profile: Profile,
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offer: Offer,
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current: PriceObservation | None,
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model: ScoringModel,
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as_of: datetime,
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) -> tuple[tuple[GateResult, ...], Eligibility]:
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gates: list[GateResult] = []
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market_ok = offer.market == profile.market
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gates.append(_gate("market", market_ok, "MARKET_MATCH", "MARKET_MISMATCH", offer.market, profile.market))
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condition_ok = offer.condition in profile.allowed_conditions
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gates.append(
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_gate(
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"condition",
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condition_ok,
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"CONDITION_ALLOWED",
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"CONDITION_NOT_ALLOWED",
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offer.condition.value,
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[item.value for item in profile.allowed_conditions],
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)
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)
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currency_ok = offer.currency == profile.currency
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gates.append(_gate("currency", currency_ok, "CURRENCY_MATCH", "CURRENCY_MISMATCH", offer.currency, profile.currency))
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if current is None:
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gates.append(GateResult("price_present", "UNKNOWN", "PRICE_MISSING", {}))
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gates.append(GateResult("price_fresh", "UNKNOWN", "PRICE_MISSING", {}))
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gates.append(GateResult("price_confidence", "UNKNOWN", "PRICE_MISSING", {}))
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gates.append(GateResult("shipping", "UNKNOWN", "SHIPPING_UNKNOWN", {}))
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gates.append(GateResult("budget", "UNKNOWN", "PRICE_MISSING", {}))
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gates.append(GateResult("availability", "UNKNOWN", "AVAILABILITY_UNKNOWN", {}))
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return tuple(gates), _combine_offer_gates(gates)
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fresh = _fresh_enough(current, as_of, model)
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if not fresh:
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gates.append(GateResult("price_present", "UNKNOWN", "PRICE_STALE", {"observed_at": current.observed_at.isoformat()}))
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gates.append(GateResult("price_fresh", "UNKNOWN", "PRICE_STALE", {}))
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else:
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gates.append(GateResult("price_present", "PASS", "PRICE_PRESENT", {"observation_id": str(current.id)}))
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gates.append(GateResult("price_fresh", "PASS", "PRICE_FRESH", {}))
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confident = statement_price_confidence(current, model)
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gates.append(
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GateResult(
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"price_confidence",
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"PASS" if confident else "UNKNOWN",
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"PRICE_CONFIDENCE_OK" if confident else "PRICE_LOW_CONFIDENCE",
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{"confidence": str(current.confidence)},
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)
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)
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shipping_known = current.shipping_price is not None
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gates.append(
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GateResult(
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"shipping",
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"PASS" if shipping_known else "UNKNOWN",
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"SHIPPING_KNOWN" if shipping_known else "SHIPPING_UNKNOWN",
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{},
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)
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)
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total = current.total_price
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if total is None or not currency_ok:
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gates.append(GateResult("budget", "UNKNOWN", "PRICE_INCOMPLETE", {}))
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elif total <= profile.budget.maximum:
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gates.append(GateResult("budget", "PASS", "WITHIN_BUDGET", {"total": str(total)}))
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else:
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gates.append(GateResult("budget", "FAIL", "OVER_BUDGET", {"total": str(total)}))
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if current.availability == Availability.IN_STOCK:
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gates.append(GateResult("availability", "PASS", "IN_STOCK", {}))
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elif current.availability == Availability.OUT_OF_STOCK:
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gates.append(GateResult("availability", "FAIL", "OUT_OF_STOCK", {}))
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else:
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gates.append(GateResult("availability", "UNKNOWN", "AVAILABILITY_UNKNOWN", {}))
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if current.currency != offer.currency:
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gates.append(GateResult("observation_currency", "FAIL", "CURRENCY_MISMATCH", {}))
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if current.source_id != offer.source_id:
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gates.append(GateResult("observation_source", "FAIL", "SOURCE_MISMATCH", {}))
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return tuple(gates), _combine_offer_gates(gates)
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def _gate(key: str, ok: bool, pass_code: str, fail_code: str, actual: Any, expected: Any) -> GateResult:
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return GateResult(
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key=key,
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status="PASS" if ok else "FAIL",
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reason_code=pass_code if ok else fail_code,
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details={"actual": actual, "expected": expected},
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)
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def _can_score_price(
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current: PriceObservation | None,
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profile: Profile,
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model: ScoringModel,
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as_of: datetime,
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) -> bool:
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if current is None:
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return False
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if current.currency != profile.currency:
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return False
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if current.total_price is None:
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return False
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if not _fresh_enough(current, as_of, model):
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return False
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return statement_price_confidence(current, model)
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def _combine_offer_gates(gates: Sequence[GateResult]) -> Eligibility:
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statuses = [gate.status for gate in gates]
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if "FAIL" in statuses:
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return Eligibility.INELIGIBLE
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if "UNKNOWN" in statuses:
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return Eligibility.UNKNOWN
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return Eligibility.ELIGIBLE
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def _reasons(
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constraints: tuple[ConstraintResult, ...],
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product_gates: tuple[GateResult, ...],
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offer_gates: tuple[GateResult, ...],
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stats,
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current: PriceObservation | None,
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history_warning: str | None,
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price_score_raw: Decimal | None,
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) -> tuple[tuple[Reason, ...], tuple[str, ...]]:
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reasons: list[Reason] = []
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warnings: list[str] = []
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for gate in (*product_gates, *offer_gates):
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if gate.status != "PASS":
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reasons.append(Reason(gate.reason_code, _gate_message(gate)))
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for item in constraints:
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if item.status != ConstraintStatus.PASS.value:
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reasons.append(Reason(item.reason_code, _constraint_message(item)))
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if history_warning:
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warnings.append(history_warning)
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reasons.append(Reason(history_warning, "Zu wenige Historientage für den 90-Tage-Median."))
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if stats.lowest_365d is not None and not stats.lowest_365d_is_full_year:
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warnings.append("LOWEST_365D_PARTIAL")
|
||
|
|
reasons.append(
|
||
|
|
Reason(
|
||
|
|
"LOWEST_365D_PARTIAL",
|
||
|
|
f"lowest_365d {stats.lowest_365d} ist das Minimum der vorhandenen {stats.lowest_365d_days} Tage, kein belegtes Jahrestief.",
|
||
|
|
)
|
||
|
|
)
|
||
|
|
if (
|
||
|
|
price_score_raw is not None
|
||
|
|
and current is not None
|
||
|
|
and current.total_price is not None
|
||
|
|
and stats.median_90d is not None
|
||
|
|
and stats.median_90d != 0
|
||
|
|
):
|
||
|
|
delta = (stats.median_90d - current.total_price) / stats.median_90d * Decimal("100")
|
||
|
|
percent = round_score(delta)
|
||
|
|
if current.total_price < stats.median_90d:
|
||
|
|
reasons.append(
|
||
|
|
Reason(
|
||
|
|
"PRICE_BELOW_MEDIAN",
|
||
|
|
f"Gesamtpreis {_de_decimal(percent)} % unter dem Median der beobachteten 90-Tage-Historie.",
|
||
|
|
)
|
||
|
|
)
|
||
|
|
elif current.total_price > stats.median_90d:
|
||
|
|
reasons.append(
|
||
|
|
Reason(
|
||
|
|
"PRICE_ABOVE_MEDIAN",
|
||
|
|
f"Gesamtpreis {_de_decimal(percent.copy_abs())} % über dem Median der beobachteten 90-Tage-Historie.",
|
||
|
|
)
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
reasons.append(Reason("PRICE_AT_MEDIAN", "Gesamtpreis entspricht dem Median der 90-Tage-Historie."))
|
||
|
|
return tuple(reasons), tuple(warnings)
|
||
|
|
|
||
|
|
|
||
|
|
def _de_decimal(value: Decimal) -> str:
|
||
|
|
return format(value, "f").replace(".", ",")
|
||
|
|
|
||
|
|
|
||
|
|
def _gate_message(gate: GateResult) -> str:
|
||
|
|
messages = {
|
||
|
|
"CATEGORY_MISMATCH": "Die Produktkategorie entspricht nicht dem Profil.",
|
||
|
|
"MARKET_MISMATCH": "Der Angebotsmarkt entspricht nicht dem Profil.",
|
||
|
|
"CONDITION_NOT_ALLOWED": "Der Angebotszustand ist im Profil nicht erlaubt.",
|
||
|
|
"CURRENCY_MISMATCH": "Die Währung entspricht nicht dem Profil.",
|
||
|
|
"PRICE_MISSING": "Es liegt keine aktuelle Preisbeobachtung vor.",
|
||
|
|
"PRICE_STALE": "Die aktuelle Preisbeobachtung ist nicht frisch genug.",
|
||
|
|
"PRICE_LOW_CONFIDENCE": "Die Preis-Confidence liegt unter der Mindestschwelle.",
|
||
|
|
"SHIPPING_UNKNOWN": "Obligatorische Versandkosten sind unbekannt.",
|
||
|
|
"OVER_BUDGET": "Der Gesamtpreis liegt über dem Budgetmaximum.",
|
||
|
|
"OUT_OF_STOCK": "Das Angebot ist nicht lieferbar.",
|
||
|
|
"AVAILABILITY_UNKNOWN": "Die Verfügbarkeit ist unbekannt.",
|
||
|
|
"SOURCE_MISMATCH": "Die Beobachtungsquelle weicht vom Angebot ab.",
|
||
|
|
}
|
||
|
|
return messages.get(gate.reason_code, gate.reason_code)
|
||
|
|
|
||
|
|
|
||
|
|
def _constraint_message(item: ConstraintResult) -> str:
|
||
|
|
if item.status == ConstraintStatus.FAIL.value:
|
||
|
|
return f"Constraint {item.constraint_id} ist nicht erfüllt."
|
||
|
|
return f"Constraint {item.constraint_id} kann nicht bewertet werden."
|
||
|
|
|
||
|
|
|
||
|
|
def _all_components(
|
||
|
|
preference_components: tuple[ScoreComponent, ...],
|
||
|
|
product_gates: tuple[GateResult, ...],
|
||
|
|
offer_gates: tuple[GateResult, ...],
|
||
|
|
budget_score: Decimal | None,
|
||
|
|
history_score: Decimal | None,
|
||
|
|
model: ScoringModel,
|
||
|
|
) -> tuple[ScoreComponent, ...]:
|
||
|
|
extra: list[ScoreComponent] = list(preference_components)
|
||
|
|
if budget_score is not None:
|
||
|
|
extra.append(
|
||
|
|
ScoreComponent(
|
||
|
|
kind="budget",
|
||
|
|
component_key="budget",
|
||
|
|
raw_score=budget_score,
|
||
|
|
weight=model.budget_weight,
|
||
|
|
contribution=model.budget_weight * budget_score,
|
||
|
|
details={},
|
||
|
|
)
|
||
|
|
)
|
||
|
|
if history_score is not None:
|
||
|
|
extra.append(
|
||
|
|
ScoreComponent(
|
||
|
|
kind="history",
|
||
|
|
component_key="history",
|
||
|
|
raw_score=history_score,
|
||
|
|
weight=model.history_weight,
|
||
|
|
contribution=model.history_weight * history_score,
|
||
|
|
details={},
|
||
|
|
)
|
||
|
|
)
|
||
|
|
for gate in product_gates:
|
||
|
|
extra.append(
|
||
|
|
ScoreComponent(
|
||
|
|
kind="product_gate",
|
||
|
|
component_key=gate.key,
|
||
|
|
raw_score=None,
|
||
|
|
weight=None,
|
||
|
|
contribution=None,
|
||
|
|
details={"status": gate.status, "reason_code": gate.reason_code, **gate.details},
|
||
|
|
)
|
||
|
|
)
|
||
|
|
for gate in offer_gates:
|
||
|
|
extra.append(
|
||
|
|
ScoreComponent(
|
||
|
|
kind="offer_gate",
|
||
|
|
component_key=gate.key,
|
||
|
|
raw_score=None,
|
||
|
|
weight=None,
|
||
|
|
contribution=None,
|
||
|
|
details={"status": gate.status, "reason_code": gate.reason_code, **gate.details},
|
||
|
|
)
|
||
|
|
)
|
||
|
|
return tuple(extra)
|
||
|
|
|
||
|
|
|
||
|
|
def _product_dict(product: Product) -> dict[str, Any]:
|
||
|
|
return {
|
||
|
|
"id": product.id,
|
||
|
|
"category": product.category,
|
||
|
|
"brand": product.brand,
|
||
|
|
"name": product.name,
|
||
|
|
"model": product.model,
|
||
|
|
"created_at": product.created_at,
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def _variant_dict(variant: ProductVariant) -> dict[str, Any]:
|
||
|
|
return {
|
||
|
|
"id": variant.id,
|
||
|
|
"product_id": variant.product_id,
|
||
|
|
"name": variant.name,
|
||
|
|
"manufacturer_sku": variant.manufacturer_sku,
|
||
|
|
"identifiers": variant.identifiers,
|
||
|
|
"created_at": variant.created_at,
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def _offer_dict(offer: Offer) -> dict[str, Any]:
|
||
|
|
return {
|
||
|
|
"id": offer.id,
|
||
|
|
"variant_id": offer.variant_id,
|
||
|
|
"source_id": offer.source_id,
|
||
|
|
"external_id": offer.external_id,
|
||
|
|
"seller": offer.seller,
|
||
|
|
"url": offer.url,
|
||
|
|
"market": offer.market,
|
||
|
|
"currency": offer.currency,
|
||
|
|
"condition": offer.condition,
|
||
|
|
"created_at": offer.created_at,
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def _attribute_dict(statement: AttributeStatement) -> dict[str, Any]:
|
||
|
|
return {
|
||
|
|
"id": statement.id,
|
||
|
|
"variant_id": statement.variant_id,
|
||
|
|
"attribute": statement.attribute,
|
||
|
|
"raw_value": statement.raw_value,
|
||
|
|
"normalized_value": statement.normalized_value,
|
||
|
|
"unit": statement.unit,
|
||
|
|
"normalization_status": statement.normalization_status,
|
||
|
|
"normalizer_version": statement.normalizer_version,
|
||
|
|
"confidence": statement.confidence,
|
||
|
|
"source_id": statement.source_id,
|
||
|
|
"source_reference": statement.source_reference,
|
||
|
|
"observed_at": statement.observed_at,
|
||
|
|
"ingested_at": statement.ingested_at,
|
||
|
|
"normalization_error": statement.normalization_error,
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def _observation_dict(observation: PriceObservation) -> dict[str, Any]:
|
||
|
|
return {
|
||
|
|
"id": observation.id,
|
||
|
|
"offer_id": observation.offer_id,
|
||
|
|
"source_id": observation.source_id,
|
||
|
|
"external_observation_id": observation.external_observation_id,
|
||
|
|
"observed_at": observation.observed_at,
|
||
|
|
"ingested_at": observation.ingested_at,
|
||
|
|
"item_price": observation.item_price,
|
||
|
|
"shipping_price": observation.shipping_price,
|
||
|
|
"currency": observation.currency,
|
||
|
|
"availability": observation.availability,
|
||
|
|
"raw_payload": observation.raw_payload,
|
||
|
|
"confidence": observation.confidence,
|
||
|
|
"total_price": observation.total_price,
|
||
|
|
}
|
||
|
|
|