init

server/src/services/review.service.js

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+import { ReviewLog } from '../models/ReviewLog.js';
+import { StudyItem } from '../models/StudyItem.js';
+import { getDaysDiff, getSRSDate } from '../utils/dateUtils.js';
+
+export const processReview = async (user, subjectId, success) => {
+	if (!user.stats) user.stats = { totalReviews: 0, correctReviews: 0, currentStreak: 0, maxStreak: 0 };
+	user.stats.totalReviews += 1;
+	if (success) user.stats.correctReviews += 1;
+
+	const todayStr = new Date().toISOString().split('T')[0];
+	const lastStudyStr = user.stats.lastStudyDate;
+
+	if (lastStudyStr !== todayStr) {
+		if (!lastStudyStr) {
+			user.stats.currentStreak = 1;
+		} else {
+			const diff = getDaysDiff(lastStudyStr, todayStr);
+			if (diff === 1) {
+				user.stats.currentStreak += 1;
+			} else if (diff > 1) {
+				const lastFreeze = user.stats.lastFreezeDate ? new Date(user.stats.lastFreezeDate) : null;
+				let daysSinceFreeze = 999;
+				if (lastFreeze) daysSinceFreeze = getDaysDiff(lastFreeze.toISOString().split('T')[0], todayStr);
+
+				const canUseShield = daysSinceFreeze >= 7;
+
+				if (canUseShield && diff === 2) {
+					console.log(`User ${user._id} saved by Zen Shield!`);
+					user.stats.lastFreezeDate = new Date();
+					user.stats.currentStreak += 1;
+				} else {
+					user.stats.currentStreak = 1;
+				}
+			}
+		}
+		user.stats.lastStudyDate = todayStr;
+		if (user.stats.currentStreak > user.stats.maxStreak) user.stats.maxStreak = user.stats.currentStreak;
+	}
+	await user.save();
+
+	await ReviewLog.findOneAndUpdate(
+		{ userId: user._id, date: todayStr },
+		{ $inc: { count: 1 } },
+		{ upsert: true, new: true }
+	);
+
+	const item = await StudyItem.findOne({ userId: user._id, wkSubjectId: subjectId });
+	if (!item) throw new Error('Item not found');
+
+	if (!item.stats) item.stats = { correct: 0, total: 0 };
+	item.stats.total += 1;
+	if (success) item.stats.correct += 1;
+
+	if (success) {
+		const nextLevel = Math.min(item.srsLevel + 1, 10);
+		item.srsLevel = nextLevel;
+		item.nextReview = getSRSDate(nextLevel);
+	} else {
+		item.srsLevel = Math.max(1, item.srsLevel - 1);
+		item.nextReview = Date.now();
+	}
+
+	await item.save();
+	return { nextReview: item.nextReview, srsLevel: item.srsLevel };
+};
+
+export const getQueue = async (user, limit = 100, sortMode) => {
+	const query = {
+		userId: user._id,
+		srsLevel: { $lt: 10, $gt: 0 },
+		nextReview: { $lte: new Date() }
+	};
+
+	let dueItems;
+	if (sortMode === 'priority') {
+		dueItems = await StudyItem.find(query).sort({ srsLevel: 1, level: 1 }).limit(limit);
+	} else {
+		dueItems = await StudyItem.find(query).limit(limit);
+		for (let i = dueItems.length - 1; i > 0; i--) {
+			const j = Math.floor(Math.random() * (i + 1));
+			[dueItems[i], dueItems[j]] = [dueItems[j], dueItems[i]];
+		}
+	}
+	return dueItems;
+};