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import type { LocalCard, LocalDeck, LocalReviewLog } from "../db/index";
import type { PendingChanges, SyncQueue } from "./queue";
/**
* Data format for push request to server
*/
export interface SyncPushData {
decks: SyncDeckData[];
cards: SyncCardData[];
reviewLogs: SyncReviewLogData[];
}
export interface SyncDeckData {
id: string;
name: string;
description: string | null;
newCardsPerDay: number;
createdAt: string;
updatedAt: string;
deletedAt: string | null;
}
export interface SyncCardData {
id: string;
deckId: string;
front: string;
back: string;
state: number;
due: string;
stability: number;
difficulty: number;
elapsedDays: number;
scheduledDays: number;
reps: number;
lapses: number;
lastReview: string | null;
createdAt: string;
updatedAt: string;
deletedAt: string | null;
}
export interface SyncReviewLogData {
id: string;
cardId: string;
rating: number;
state: number;
scheduledDays: number;
elapsedDays: number;
reviewedAt: string;
durationMs: number | null;
}
/**
* Response from push endpoint
*/
export interface SyncPushResult {
decks: { id: string; syncVersion: number }[];
cards: { id: string; syncVersion: number }[];
reviewLogs: { id: string; syncVersion: number }[];
conflicts: {
decks: string[];
cards: string[];
};
}
/**
* Options for creating a push service
*/
export interface PushServiceOptions {
syncQueue: SyncQueue;
pushToServer: (data: SyncPushData) => Promise<SyncPushResult>;
}
/**
* Convert local deck to sync format
*/
function deckToSyncData(deck: LocalDeck): SyncDeckData {
return {
id: deck.id,
name: deck.name,
description: deck.description,
newCardsPerDay: deck.newCardsPerDay,
createdAt: deck.createdAt.toISOString(),
updatedAt: deck.updatedAt.toISOString(),
deletedAt: deck.deletedAt?.toISOString() ?? null,
};
}
/**
* Convert local card to sync format
*/
function cardToSyncData(card: LocalCard): SyncCardData {
return {
id: card.id,
deckId: card.deckId,
front: card.front,
back: card.back,
state: card.state,
due: card.due.toISOString(),
stability: card.stability,
difficulty: card.difficulty,
elapsedDays: card.elapsedDays,
scheduledDays: card.scheduledDays,
reps: card.reps,
lapses: card.lapses,
lastReview: card.lastReview?.toISOString() ?? null,
createdAt: card.createdAt.toISOString(),
updatedAt: card.updatedAt.toISOString(),
deletedAt: card.deletedAt?.toISOString() ?? null,
};
}
/**
* Convert local review log to sync format
*/
function reviewLogToSyncData(log: LocalReviewLog): SyncReviewLogData {
return {
id: log.id,
cardId: log.cardId,
rating: log.rating,
state: log.state,
scheduledDays: log.scheduledDays,
elapsedDays: log.elapsedDays,
reviewedAt: log.reviewedAt.toISOString(),
durationMs: log.durationMs,
};
}
/**
* Convert pending changes to sync push data format
*/
export function pendingChangesToPushData(
changes: PendingChanges,
): SyncPushData {
return {
decks: changes.decks.map(deckToSyncData),
cards: changes.cards.map(cardToSyncData),
reviewLogs: changes.reviewLogs.map(reviewLogToSyncData),
};
}
/**
* Push sync service
*
* Handles pushing local changes to the server:
* 1. Get pending changes from sync queue
* 2. Convert to API format
* 3. Send to server
* 4. Mark items as synced on success
* 5. Handle conflicts (server wins for LWW)
*/
export class PushService {
private syncQueue: SyncQueue;
private pushToServer: (data: SyncPushData) => Promise<SyncPushResult>;
constructor(options: PushServiceOptions) {
this.syncQueue = options.syncQueue;
this.pushToServer = options.pushToServer;
}
/**
* Push all pending changes to the server
*
* @returns Result containing synced items and conflicts
* @throws Error if push fails
*/
async push(): Promise<SyncPushResult> {
const pendingChanges = await this.syncQueue.getPendingChanges();
// If no pending changes, return empty result
if (
pendingChanges.decks.length === 0 &&
pendingChanges.cards.length === 0 &&
pendingChanges.reviewLogs.length === 0
) {
return {
decks: [],
cards: [],
reviewLogs: [],
conflicts: { decks: [], cards: [] },
};
}
// Convert to API format
const pushData = pendingChangesToPushData(pendingChanges);
// Push to server
const result = await this.pushToServer(pushData);
// Mark successfully synced items
await this.syncQueue.markSynced({
decks: result.decks,
cards: result.cards,
reviewLogs: result.reviewLogs,
});
return result;
}
/**
* Check if there are pending changes to push
*/
async hasPendingChanges(): Promise<boolean> {
return this.syncQueue.hasPendingChanges();
}
}
/**
* Create a push service with the given options
*/
export function createPushService(options: PushServiceOptions): PushService {
return new PushService(options);
}
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