harukin-expo-dev-env
1ecd026908
- Add `currentTrainMetadata.ts` to manage carrying forward official position metadata between train snapshots. - Introduce `lineDisplayName.ts` for mapping line IDs to display names. - Create `officialPositionCache.ts` for parsing and serializing official position data with cache validation. - Enhance `officialPositionService.ts` to support persistent caching of official positions and improve resolver functionality. - Update `requestCoordinator.ts` to allow cancellation of polling requests without disposing of the coordinator. - Modify `trainTimeFiltering.ts` to incorporate line ID context when checking for duplicate train data. - Refactor `useCurrentTrain.tsx` to support polling for current train data with official position enrichment. - Add tests for new features, including persistent cache behavior and handling of ambiguous train data.
60 lines
1.7 KiB
TypeScript
60 lines
1.7 KiB
TypeScript
import type { trainDataType } from "@/lib/trainPositionTextArray";
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import {
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officialPositionLookupKey,
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type OfficialPositionLookupInput,
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} from "@/lib/domain/railway";
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const toLookupInput = (
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train: trainDataType,
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): OfficialPositionLookupInput | null => {
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if (
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typeof train.Pos !== "string" ||
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train.Pos.length === 0 ||
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typeof train.Line !== "string" ||
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train.Line.length === 0 ||
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train.PosNum === undefined ||
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(typeof train.PosNum === "string" && train.PosNum.length === 0) ||
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(typeof train.PosNum === "number" && !Number.isFinite(train.PosNum))
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) {
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return null;
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}
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return {
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line: train.Line,
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pos: train.Pos,
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posNum: train.PosNum,
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};
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};
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/**
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* Keeps the currently displayed official metadata while the next current-train
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* snapshot is being enriched. Only an identical line/position/position-number
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* tuple may carry metadata forward.
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*/
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export const carryForwardOfficialPositionMetadata = (
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next: readonly trainDataType[],
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previous: readonly trainDataType[],
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): trainDataType[] => {
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const metadataByKey = new Map<
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string,
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NonNullable<trainDataType["officialPosition"]>
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>();
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for (const train of previous) {
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if (!train.officialPosition) continue;
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const input = toLookupInput(train);
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if (!input) continue;
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metadataByKey.set(
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officialPositionLookupKey(input),
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train.officialPosition,
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);
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}
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return next.map((train) => {
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if (train.officialPosition) return train;
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const input = toLookupInput(train);
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if (!input) return train;
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const metadata = metadataByKey.get(officialPositionLookupKey(input));
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return metadata ? { ...train, officialPosition: metadata } : train;
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});
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};
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