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import type {
CardStateType,
LocalCard,
LocalDeck,
LocalReviewLog,
RatingType,
} from "../db/index";
import type { SyncQueue } from "./queue";
/**
* Server deck data format from pull response
*/
export interface ServerDeck {
id: string;
userId: string;
name: string;
description: string | null;
newCardsPerDay: number;
createdAt: Date;
updatedAt: Date;
deletedAt: Date | null;
syncVersion: number;
}
/**
* Server card data format from pull response
*/
export interface ServerCard {
id: string;
deckId: string;
noteId?: string | null;
isReversed?: boolean | null;
front: string;
back: string;
state: number;
due: Date;
stability: number;
difficulty: number;
elapsedDays: number;
scheduledDays: number;
reps: number;
lapses: number;
lastReview: Date | null;
createdAt: Date;
updatedAt: Date;
deletedAt: Date | null;
syncVersion: number;
}
/**
* Server review log data format from pull response
*/
export interface ServerReviewLog {
id: string;
cardId: string;
userId: string;
rating: number;
state: number;
scheduledDays: number;
elapsedDays: number;
reviewedAt: Date;
durationMs: number | null;
syncVersion: number;
}
/**
* Response from pull endpoint
*/
export interface SyncPullResult {
decks: ServerDeck[];
cards: ServerCard[];
reviewLogs: ServerReviewLog[];
currentSyncVersion: number;
}
/**
* Options for creating a pull service
*/
export interface PullServiceOptions {
syncQueue: SyncQueue;
pullFromServer: (lastSyncVersion: number) => Promise<SyncPullResult>;
}
/**
* Convert server deck to local deck format
*/
function serverDeckToLocal(deck: ServerDeck): LocalDeck {
return {
id: deck.id,
userId: deck.userId,
name: deck.name,
description: deck.description,
newCardsPerDay: deck.newCardsPerDay,
createdAt: new Date(deck.createdAt),
updatedAt: new Date(deck.updatedAt),
deletedAt: deck.deletedAt ? new Date(deck.deletedAt) : null,
syncVersion: deck.syncVersion,
_synced: true,
};
}
/**
* Convert server card to local card format
*/
function serverCardToLocal(card: ServerCard): LocalCard {
return {
id: card.id,
deckId: card.deckId,
noteId: card.noteId ?? null,
isReversed: card.isReversed ?? null,
front: card.front,
back: card.back,
state: card.state as CardStateType,
due: new Date(card.due),
stability: card.stability,
difficulty: card.difficulty,
elapsedDays: card.elapsedDays,
scheduledDays: card.scheduledDays,
reps: card.reps,
lapses: card.lapses,
lastReview: card.lastReview ? new Date(card.lastReview) : null,
createdAt: new Date(card.createdAt),
updatedAt: new Date(card.updatedAt),
deletedAt: card.deletedAt ? new Date(card.deletedAt) : null,
syncVersion: card.syncVersion,
_synced: true,
};
}
/**
* Convert server review log to local review log format
*/
function serverReviewLogToLocal(log: ServerReviewLog): LocalReviewLog {
return {
id: log.id,
cardId: log.cardId,
userId: log.userId,
rating: log.rating as RatingType,
state: log.state as CardStateType,
scheduledDays: log.scheduledDays,
elapsedDays: log.elapsedDays,
reviewedAt: new Date(log.reviewedAt),
durationMs: log.durationMs,
syncVersion: log.syncVersion,
_synced: true,
};
}
/**
* Convert server pull result to local format for storage
*/
export function pullResultToLocalData(result: SyncPullResult): {
decks: LocalDeck[];
cards: LocalCard[];
reviewLogs: LocalReviewLog[];
} {
return {
decks: result.decks.map(serverDeckToLocal),
cards: result.cards.map(serverCardToLocal),
reviewLogs: result.reviewLogs.map(serverReviewLogToLocal),
};
}
/**
* Pull sync service
*
* Handles pulling changes from the server:
* 1. Get last sync version from sync queue
* 2. Request changes from server since that version
* 3. Convert server data to local format
* 4. Apply changes to local database
* 5. Update sync version
*/
export class PullService {
private syncQueue: SyncQueue;
private pullFromServer: (lastSyncVersion: number) => Promise<SyncPullResult>;
constructor(options: PullServiceOptions) {
this.syncQueue = options.syncQueue;
this.pullFromServer = options.pullFromServer;
}
/**
* Pull changes from the server
*
* @returns Result containing pulled items and new sync version
* @throws Error if pull fails
*/
async pull(): Promise<SyncPullResult> {
const lastSyncVersion = this.syncQueue.getLastSyncVersion();
// Pull changes from server
const result = await this.pullFromServer(lastSyncVersion);
// If there are changes, apply them to local database
if (
result.decks.length > 0 ||
result.cards.length > 0 ||
result.reviewLogs.length > 0
) {
const localData = pullResultToLocalData(result);
await this.syncQueue.applyPulledChanges(localData);
}
// Update sync version even if no changes (to mark we synced up to this point)
if (result.currentSyncVersion > lastSyncVersion) {
await this.syncQueue.completeSync(result.currentSyncVersion);
}
return result;
}
/**
* Get the last sync version
*/
getLastSyncVersion(): number {
return this.syncQueue.getLastSyncVersion();
}
}
/**
* Create a pull service with the given options
*/
export function createPullService(options: PullServiceOptions): PullService {
return new PullService(options);
}
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