实现连续学习里程碑奖励

docs/gamification-server-plan.md

@@ -57,13 +57,14 @@
 | G2-2 | 扩展 XP 奖励来源 | [x] | 支持普通题 10、困难题 15、看解析 3、完成挑战 20、全对 30、首次知识卡 15、每日任务、主题节点奖励 |
 | G2-3 | 修正连对奖励 | [x] | 3 连对 +5，5 连对 +10，10 连对 +25，并返回客户端可展示奖励 |
 | G2-4 | 将连续学习改为按挑战组完成计算 | [x] | 每天至少完成 1 组挑战才更新 streak，不再依赖当天正确题数阈值 |
-| G2-5 | 实现连续学习里程碑奖励 | [ ] | 3/7/14/30/100 天奖励可发放且不可重复领取 |
+| G2-5 | 实现连续学习里程碑奖励 | [x] | 3/7/14/30/100 天奖励可发放且不可重复领取 |
 | G2-6 | 实现每日首次进入送红心 | [ ] | 每日首次 bootstrap 或专用 check-in 最多补 1 颗，不超过上限 |
 | G2-7 | 添加 XP/streak 测试 | [ ] | 覆盖等级边界、首次知识卡、完成组奖励、全对奖励、看解析奖励、连续学习保护 |
 
 验证记录（2026-05-13）：G2-2 已通过 `./node_modules/.bin/tsc --noEmit` 和 `./node_modules/.bin/eslint .`；`bun` 当前 shell 不在 PATH，`./node_modules/.bin/vitest run` 启动阶段被 macOS 拒绝加载未签名的 `@rolldown/binding-darwin-x64` 原生 binding，需修复本地依赖安装或签名后复跑。
 验证记录（2026-05-13）：G2-3 已通过 `./node_modules/.bin/tsc --noEmit` 和 `./node_modules/.bin/eslint .`；定向运行 `./node_modules/.bin/vitest run src/__tests__/services/progress/xp-service.test.ts src/__tests__/services/learning/challenge-service.test.ts` 仍在启动阶段被同一个 `@rolldown/binding-darwin-x64` 原生 binding 签名问题阻塞。
 验证记录（2026-05-13）：G2-4 已通过 `./node_modules/.bin/tsc --noEmit` 和 `./node_modules/.bin/eslint .`；定向运行 `./node_modules/.bin/vitest run src/__tests__/services/progress/streak-service.test.ts src/__tests__/services/learning/challenge-service.test.ts` 仍在启动阶段被同一个 `@rolldown/binding-darwin-x64` 原生 binding 签名问题阻塞。
+验证记录（2026-05-13）：G2-5 已通过 `./node_modules/.bin/tsc --noEmit` 和 `./node_modules/.bin/eslint .`；定向运行 `./node_modules/.bin/vitest run src/__tests__/services/progress/streak-service.test.ts src/__tests__/services/learning/challenge-service.test.ts` 仍在启动阶段被同一个 `@rolldown/binding-darwin-x64` 原生 binding 签名问题阻塞。
 
 ## Phase G3：金币、商店和道具
 

src/__tests__/services/learning/challenge-service.test.ts

@@ -433,6 +433,7 @@ describe('challenge-service', () => {
         [],                 // no existing chapter progress
         [],                 // no existing daily progress
         [{ streakDays: 2, streakLastDate: new Date(Date.now() - 86_400_000).toISOString() }], // updateStreakForCompletedChallenge
+        [],                 // no existing streak milestone reward
         [knowledgeCardRow],
         // getProgressSummary (final)
         [userAfterXp],
@@ -456,6 +457,7 @@ describe('challenge-service', () => {
           expect.objectContaining({ type: 'xp', source: 'first_knowledge_card', amount: 15 }),
           expect.objectContaining({ type: 'xp', amount: 20, title: '完成挑战 +20 XP' }),
           expect.objectContaining({ type: 'xp', amount: 30, title: '全对奖励 +30 XP' }),
+          expect.objectContaining({ type: 'chest', source: 'streak_milestone', milestoneDays: 3 }),
         ]),
       );
     });

src/__tests__/services/progress/streak-service.test.ts

@@ -1,6 +1,10 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest';
 import { db } from '../../../db/client.js';
-import { updateStreakForCompletedChallenge } from '../../../services/progress/streak-service.js';
+import {
+  getStreakMilestoneReward,
+  grantStreakMilestoneReward,
+  updateStreakForCompletedChallenge,
+} from '../../../services/progress/streak-service.js';
 
 // Test the pure logic of date comparison
 // The DB-dependent functions are tested via integration tests
@@ -28,7 +32,26 @@ describe('Streak service — date logic', () => {
 });
 
 describe('Streak service — completed challenge updates', () => {
+  function selectQueue(queue: unknown[][]) {
+    let index = 0;
+    vi.mocked(db.select).mockImplementation((() => {
+      const rows = queue[index] ?? [];
+      index += 1;
+      return {
+        from: vi.fn().mockReturnValue({
+          where: vi.fn().mockReturnValue({
+            limit: vi.fn().mockResolvedValue(rows),
+          }),
+        }),
+      };
+    }) as never);
+  }
+
   function selectUser(rows: unknown[]) {
+    selectQueue([rows]);
+  }
+
+  function selectRows(rows: unknown[]) {
     vi.mocked(db.select).mockReturnValue({
       from: vi.fn().mockReturnValue({
         where: vi.fn().mockReturnValue({
@@ -45,17 +68,36 @@ describe('Streak service — completed challenge updates', () => {
     return { set, where };
   }
 
+  function mockInsert() {
+    const values = vi.fn().mockResolvedValue(undefined);
+    vi.mocked(db.insert).mockReturnValue({ values } as never);
+    return { values };
+  }
+
   it('increments streak after completing the first challenge session of a consecutive day', async () => {
     const yesterday = new Date();
     yesterday.setDate(yesterday.getDate() - 1);
-    selectUser([{ streakDays: 2, streakLastDate: yesterday.toISOString() }]);
+    selectQueue([
+      [{ streakDays: 2, streakLastDate: yesterday.toISOString() }],
+      [],
+    ]);
     const update = mockUpdate();
+    const insert = mockInsert();
 
     const result = await updateStreakForCompletedChallenge('user-1');
 
     expect(result.days).toBe(3);
     expect(result.lastDate).toBe(new Date().toISOString().slice(0, 10));
+    expect(result.rewards).toEqual([
+      expect.objectContaining({ type: 'chest', source: 'streak_milestone', milestoneDays: 3 }),
+    ]);
     expect(update.set).toHaveBeenCalled();
+    expect(insert.values).toHaveBeenCalledWith(expect.objectContaining({
+      sourceType: 'streak_milestone',
+      sourceId: '3',
+      idempotencyKey: 'streak_milestone:3',
+      status: 'completed',
+    }));
   });
 
   it('does not increment more than once on the same day', async () => {
@@ -79,4 +121,26 @@ describe('Streak service — completed challenge updates', () => {
     expect(result.days).toBe(1);
     expect(update.set).toHaveBeenCalled();
   });
+
+  it('returns milestone reward definitions for configured days', () => {
+    expect(getStreakMilestoneReward(7)).toEqual({
+      type: 'item',
+      source: 'streak_milestone',
+      milestoneDays: 7,
+      itemId: 'streak_shield',
+      quantity: 1,
+      title: '连续学习 7 天连胜护盾 x1',
+    });
+    expect(getStreakMilestoneReward(8)).toBeNull();
+  });
+
+  it('does not grant duplicate milestone rewards', async () => {
+    selectRows([{ id: 'ledger-1' }]);
+    mockInsert();
+
+    const rewards = await grantStreakMilestoneReward('user-1', 7);
+
+    expect(rewards).toEqual([]);
+    expect(db.insert).not.toHaveBeenCalled();
+  });
 });

src/services/gamification/rules.ts

@@ -61,6 +61,13 @@ export const LEVEL_RULES = Object.freeze({
 export const STREAK_RULES = Object.freeze({
   countedByCompletedChallengeSessions: 1,
   milestoneDays: Object.freeze([3, 7, 14, 30, 100] as const),
+  milestoneRewards: Object.freeze({
+    3: Object.freeze({ type: 'chest', title: '连续学习 3 天小宝箱' }),
+    7: Object.freeze({ type: 'item', itemId: 'streak_shield', quantity: 1, title: '连续学习 7 天连胜护盾 x1' }),
+    14: Object.freeze({ type: 'item', itemId: 'double_xp_potion', quantity: 1, title: '连续学习 14 天双倍 XP 药水 x1' }),
+    30: Object.freeze({ type: 'cosmetic', itemId: 'streak_badge_30', quantity: 1, title: '连续学习 30 天限定徽章' }),
+    100: Object.freeze({ type: 'cosmetic', itemId: 'streak_title_100', quantity: 1, title: '连续学习 100 天稀有称号' }),
+  } as const),
   comboChestBoostAt: 10,
 });
 

src/services/learning/challenge-service.ts

@@ -279,13 +279,16 @@ async function settleCompletedChallenge(
     await addXp(userId, xpDelta);
   }
 
-  await Promise.all([
+  const [, , streak] = await Promise.all([
     updateChapterProgress(userId, session, correctCount, totalQuestions),
     updateDailyProgress(userId, session, xpDelta),
     updateStreakForCompletedChallenge(userId),
   ]);
 
-  const rewards = getChallengeCompletionRewards(correctCount, totalQuestions, multiplier);
+  const rewards = [
+    ...getChallengeCompletionRewards(correctCount, totalQuestions, multiplier),
+    ...(streak.rewards ?? []),
+  ];
 
   return { rewards, xpDelta, progressBefore };
 }

src/services/progress/streak-service.ts

@@ -1,11 +1,25 @@
 import { db } from '../../db/client.js';
-import { users } from '../../db/schema.js';
+import { rewardLedger, users } from '../../db/schema.js';
-import { eq, sql } from 'drizzle-orm';
+import { and, eq, sql } from 'drizzle-orm';
+import { v4 as uuid } from 'uuid';
+import { STREAK_RULES } from '../gamification/rules.js';
+
+type StreakMilestoneDay = typeof STREAK_RULES.milestoneDays[number];
+
+export interface StreakMilestoneReward {
+  type: string;
+  source: 'streak_milestone';
+  milestoneDays: StreakMilestoneDay;
+  itemId?: string;
+  quantity?: number;
+  title: string;
+}
 
 export interface StreakInfo {
   days: number;
   lastDate: string | null;
   frozen: boolean;
+  rewards?: readonly StreakMilestoneReward[];
 }
 
 /**
@@ -83,7 +97,60 @@ export async function updateStreakForCompletedChallenge(userId: string): Promise
     .set({ streakDays: newDays, streakLastDate: sql`CAST(${today} AS DATE)` })
     .where(eq(users.id, userId));
 
-  return { days: newDays, lastDate: today, frozen: false };
+  const rewards = await grantStreakMilestoneReward(userId, newDays);
+  return { days: newDays, lastDate: today, frozen: false, rewards };
+}
+
+export function getStreakMilestoneReward(days: number): StreakMilestoneReward | null {
+  if (!isStreakMilestoneDay(days)) return null;
+  const reward = STREAK_RULES.milestoneRewards[days];
+  return {
+    type: reward.type,
+    source: 'streak_milestone',
+    milestoneDays: days,
+    itemId: 'itemId' in reward ? reward.itemId : undefined,
+    quantity: 'quantity' in reward ? reward.quantity : undefined,
+    title: reward.title,
+  };
+}
+
+export async function grantStreakMilestoneReward(
+  userId: string,
+  days: number,
+): Promise<readonly StreakMilestoneReward[]> {
+  const reward = getStreakMilestoneReward(days);
+  if (!reward) return [];
+
+  const idempotencyKey = `streak_milestone:${days}`;
+  const [existing] = await db
+    .select({ id: rewardLedger.id })
+    .from(rewardLedger)
+    .where(and(
+      eq(rewardLedger.userId, userId),
+      eq(rewardLedger.idempotencyKey, idempotencyKey),
+    ))
+    .limit(1);
+
+  if (existing) return [];
+
+  await db.insert(rewardLedger).values({
+    id: uuid(),
+    userId,
+    sourceType: 'streak_milestone',
+    sourceId: String(days),
+    idempotencyKey,
+    status: 'completed',
+    rewardSnapshot: {
+      rewards: [reward],
+      milestoneDays: days,
+    },
+    resourceDeltas: {
+      rewards: [reward],
+    },
+    settledAt: sql`NOW()`,
+  });
+
+  return [reward];
 }
 
 /**
@@ -115,3 +182,7 @@ function yesterdayUtc(): string {
   d.setDate(d.getDate() - 1);
   return d.toISOString().slice(0, 10);
 }
+
+function isStreakMilestoneDay(days: number): days is StreakMilestoneDay {
+  return (STREAK_RULES.milestoneDays as readonly number[]).includes(days);
+}

src/types/app-api.ts

@@ -118,7 +118,14 @@ export interface AnswerResultDto {
     summary: string;
     fact: string;
   };
-  rewards: ReadonlyArray<{ type: string; source?: string; amount?: number; title?: string }>;
+  rewards: ReadonlyArray<{
+    type: string;
+    source?: string;
+    amount?: number;
+    itemId?: string;
+    quantity?: number;
+    title?: string;
+  }>;
 }
 
 export interface LeaderboardEntryDto {