vjrj
7fd87e6e62
The testable core of the offers UI slice, transport-agnostic: - OfferMapper: pure app-sharing-intent (OfferStatus) -> network Offer/OfferType mapping; keeps price only for sales, refuses to publish private lots. - OffersCubit: discover(geohash) streams results; publish() reports the verdict; depends on the OfferTransport interface (fake in tests) and degrades gracefully offline (null transport = social layer unavailable, never throws). 8 tests green (fake in-memory transport, no relay). Screen/routing/i18n come next — they need two product decisions (coarse-area capture, relay list).
53 lines
1.9 KiB
Dart
53 lines
1.9 KiB
Dart
import 'package:commons_core/commons_core.dart';
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import '../db/enums.dart';
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/// Turns a locally-shared lot into a publishable [Offer]. Pure — no I/O — so it
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/// is easy to test and keeps the privacy seam explicit: only the fields passed
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/// here ever reach the network (never the whole lot/inventory, never an exact
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/// address; the area is a coarse geohash chosen by the user).
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class OfferMapper {
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const OfferMapper._();
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/// Maps the app's local sharing intent ([OfferStatus]) to the network offer
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/// type. `private` lots are never published.
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static OfferType offerTypeFor(OfferStatus sharing) => switch (sharing) {
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OfferStatus.shared => OfferType.gift,
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OfferStatus.exchange => OfferType.exchange,
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OfferStatus.sell => OfferType.sale,
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OfferStatus.private =>
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throw ArgumentError('private lots are not published to the network'),
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};
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/// Builds the [Offer] for a shared lot. [lotId] gives the offer a stable,
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/// addressable id (re-publishing updates in place). [areaGeohash] is the
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/// user's coarse area — the transport coarsens it further on the wire.
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static Offer fromSharedLot({
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required String lotId,
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required String authorPubkeyHex,
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required String summary,
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required OfferStatus sharing,
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required String areaGeohash,
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String? category,
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num? priceAmount,
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String? priceCurrency,
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String? exchangeTerms,
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String? imageUrl,
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DateTime? expiresAt,
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}) {
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final type = offerTypeFor(sharing);
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return Offer(
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id: lotId,
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authorPubkeyHex: authorPubkeyHex,
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summary: summary,
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type: type,
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approxGeohash: areaGeohash,
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category: category,
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priceAmount: type == OfferType.sale ? priceAmount : null,
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priceCurrency: type == OfferType.sale ? priceCurrency : null,
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exchangeTerms: type == OfferType.exchange ? exchangeTerms : null,
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imageUrl: imageUrl,
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expiresAt: expiresAt,
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);
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}
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}
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