import { eq, desc, and, asc, lte, gte, or, sql } from "drizzle-orm";
import { drizzle } from "drizzle-orm/mysql2";
import {
  InsertUser, users,
  usernameAccounts,
  trainingPlans, InsertTrainingPlan,
  trainingVideos, InsertTrainingVideo,
  poseAnalyses, InsertPoseAnalysis,
  trainingRecords, InsertTrainingRecord,
  liveAnalysisSessions, InsertLiveAnalysisSession,
  liveAnalysisRuntime, InsertLiveAnalysisRuntime,
  liveActionSegments, InsertLiveActionSegment,
  dailyTrainingAggregates, InsertDailyTrainingAggregate,
  ratingHistory, InsertRatingHistory,
  ntrpSnapshots, InsertNtrpSnapshot,
  dailyCheckins, InsertDailyCheckin,
  userBadges, InsertUserBadge,
  achievementDefinitions, InsertAchievementDefinition,
  userAchievements, InsertUserAchievement,
  tutorialVideos, InsertTutorialVideo,
  tutorialProgress, InsertTutorialProgress,
  trainingReminders, InsertTrainingReminder,
  notificationLog, InsertNotificationLog,
  backgroundTasks, InsertBackgroundTask,
  adminAuditLogs, InsertAdminAuditLog,
  appSettings, InsertAppSetting,
  visionReferenceImages, InsertVisionReferenceImage,
  visionTestRuns, InsertVisionTestRun,
} from "../drizzle/schema";
import { ENV } from './_core/env';
import { fetchTutorialMetrics, shouldRefreshTutorialMetrics } from "./tutorialMetrics";

let _db: ReturnType<typeof drizzle> | null = null;

const APP_TIMEZONE = process.env.TZ || "Asia/Shanghai";
export const LIVE_ANALYSIS_RUNTIME_TIMEOUT_MS = 15_000;

function getDateFormatter() {
  return new Intl.DateTimeFormat("en-CA", {
    timeZone: APP_TIMEZONE,
    year: "numeric",
    month: "2-digit",
    day: "2-digit",
  });
}

export function getDateKey(date = new Date()) {
  return getDateFormatter().format(date);
}

function toDayKey(userId: number, trainingDate: string) {
  return `${userId}:${trainingDate}`;
}

export const DEFAULT_APP_SETTINGS: Omit<InsertAppSetting, "id" | "createdAt" | "updatedAt">[] = [
  {
    settingKey: "action_unknown_confidence_threshold",
    label: "未知动作阈值",
    description: "当动作识别置信度低于此值时归类为未知动作。",
    value: { value: 0.45, type: "number" },
  },
  {
    settingKey: "action_merge_gap_ms",
    label: "动作合并间隔",
    description: "相邻同类动作小于该间隔时会合并为同一片段。",
    value: { value: 500, type: "number" },
  },
  {
    settingKey: "action_segment_max_ms",
    label: "动作片段最长时长",
    description: "单个动作片段最长持续时间。",
    value: { value: 10000, type: "number" },
  },
  {
    settingKey: "ntrp_daily_refresh_hour",
    label: "NTRP 每日刷新小时",
    description: "每天异步刷新 NTRP 的小时数。",
    value: { value: 0, type: "number" },
  },
];

export const ACHIEVEMENT_DEFINITION_SEED_DATA: Omit<InsertAchievementDefinition, "id" | "createdAt" | "updatedAt">[] = [
  { key: "training_day_1", name: "开练", description: "完成首个训练日", category: "consistency", rarity: "common", icon: "🎾", metricKey: "training_days", targetValue: 1, tier: 1, sortOrder: 1, isHidden: 0, isActive: 1 },
  { key: "training_day_3", name: "三日连练", description: "连续训练 3 天", category: "consistency", rarity: "common", icon: "🔥", metricKey: "current_streak", targetValue: 3, tier: 2, sortOrder: 2, isHidden: 0, isActive: 1 },
  { key: "training_day_7", name: "一周稳定", description: "连续训练 7 天", category: "consistency", rarity: "rare", icon: "⭐", metricKey: "current_streak", targetValue: 7, tier: 3, sortOrder: 3, isHidden: 0, isActive: 1 },
  { key: "training_minutes_60", name: "首个小时", description: "累计训练 60 分钟", category: "volume", rarity: "common", icon: "⏱️", metricKey: "total_minutes", targetValue: 60, tier: 1, sortOrder: 10, isHidden: 0, isActive: 1 },
  { key: "training_minutes_300", name: "五小时达标", description: "累计训练 300 分钟", category: "volume", rarity: "rare", icon: "🕐", metricKey: "total_minutes", targetValue: 300, tier: 2, sortOrder: 11, isHidden: 0, isActive: 1 },
  { key: "training_minutes_1000", name: "千分钟训练者", description: "累计训练 1000 分钟", category: "volume", rarity: "epic", icon: "⏰", metricKey: "total_minutes", targetValue: 1000, tier: 3, sortOrder: 12, isHidden: 0, isActive: 1 },
  { key: "effective_actions_50", name: "动作起步", description: "累计完成 50 个有效动作", category: "technique", rarity: "common", icon: "🏓", metricKey: "effective_actions", targetValue: 50, tier: 1, sortOrder: 20, isHidden: 0, isActive: 1 },
  { key: "effective_actions_200", name: "动作累积", description: "累计完成 200 个有效动作", category: "technique", rarity: "rare", icon: "💥", metricKey: "effective_actions", targetValue: 200, tier: 2, sortOrder: 21, isHidden: 0, isActive: 1 },
  { key: "recordings_1", name: "录像开启", description: "完成首个录制归档", category: "recording", rarity: "common", icon: "🎥", metricKey: "recording_count", targetValue: 1, tier: 1, sortOrder: 30, isHidden: 0, isActive: 1 },
  { key: "analyses_1", name: "分析首秀", description: "完成首个分析会话", category: "analysis", rarity: "common", icon: "🧠", metricKey: "analysis_count", targetValue: 1, tier: 1, sortOrder: 31, isHidden: 0, isActive: 1 },
  { key: "live_analysis_5", name: "实时观察者", description: "完成 5 次实时分析", category: "analysis", rarity: "rare", icon: "📹", metricKey: "live_analysis_count", targetValue: 5, tier: 2, sortOrder: 32, isHidden: 0, isActive: 1 },
  { key: "score_80", name: "高分动作", description: "任意训练得分达到 80", category: "quality", rarity: "rare", icon: "🏅", metricKey: "best_score", targetValue: 80, tier: 1, sortOrder: 40, isHidden: 0, isActive: 1 },
  { key: "score_90", name: "精确击球", description: "任意训练得分达到 90", category: "quality", rarity: "epic", icon: "🥇", metricKey: "best_score", targetValue: 90, tier: 2, sortOrder: 41, isHidden: 0, isActive: 1 },
  { key: "ntrp_2_5", name: "NTRP 2.5", description: "综合评分达到 2.5", category: "rating", rarity: "rare", icon: "📈", metricKey: "ntrp_rating", targetValue: 2.5, tier: 1, sortOrder: 50, isHidden: 0, isActive: 1 },
  { key: "ntrp_3_0", name: "NTRP 3.0", description: "综合评分达到 3.0", category: "rating", rarity: "epic", icon: "🚀", metricKey: "ntrp_rating", targetValue: 3.0, tier: 2, sortOrder: 51, isHidden: 0, isActive: 1 },
  { key: "pk_session_1", name: "训练 PK", description: "完成首个 PK 会话", category: "pk", rarity: "rare", icon: "⚔️", metricKey: "pk_count", targetValue: 1, tier: 1, sortOrder: 60, isHidden: 0, isActive: 1 },
  { key: "plan_link_5", name: "按计划训练", description: "累计 5 次训练匹配训练计划", category: "plan", rarity: "rare", icon: "🗂️", metricKey: "plan_matches", targetValue: 5, tier: 1, sortOrder: 70, isHidden: 0, isActive: 1 },
  { key: "ai_tutorial_1", name: "AI 教程开箱", description: "完成首个 AI 部署或测试教程", category: "tutorial", rarity: "common", icon: "🧭", metricKey: "tutorial_completed_count", targetValue: 1, tier: 1, sortOrder: 80, isHidden: 0, isActive: 1 },
  { key: "ai_tutorial_3", name: "AI 学习加速", description: "累计完成 3 个 AI 部署或测试教程", category: "tutorial", rarity: "rare", icon: "🚧", metricKey: "tutorial_completed_count", targetValue: 3, tier: 2, sortOrder: 81, isHidden: 0, isActive: 1 },
  { key: "ai_deploy_path", name: "部署通关", description: "完成全部 AI 部署专题教程", category: "tutorial", rarity: "epic", icon: "🚀", metricKey: "ai_deploy_completed_count", targetValue: 5, tier: 3, sortOrder: 82, isHidden: 0, isActive: 1 },
  { key: "ai_testing_path", name: "测试通关", description: "完成全部 AI 测试专题教程", category: "tutorial", rarity: "epic", icon: "🧪", metricKey: "ai_testing_completed_count", targetValue: 5, tier: 3, sortOrder: 83, isHidden: 0, isActive: 1 },
  { key: "ai_tutorial_master", name: "实战运维学徒", description: "完成全部 AI 学习路径", category: "tutorial", rarity: "legendary", icon: "🏗️", metricKey: "tutorial_completed_count", targetValue: 10, tier: 4, sortOrder: 84, isHidden: 0, isActive: 1 },
];

export async function getDb() {
  if (!_db && process.env.DATABASE_URL) {
    try {
      _db = drizzle(process.env.DATABASE_URL);
    } catch (error) {
      console.warn("[Database] Failed to connect:", error);
      _db = null;
    }
  }
  return _db;
}

export async function seedAppSettings() {
  const db = await getDb();
  if (!db) return;

  for (const setting of DEFAULT_APP_SETTINGS) {
    const existing = await db.select().from(appSettings).where(eq(appSettings.settingKey, setting.settingKey)).limit(1);
    if (existing.length === 0) {
      await db.insert(appSettings).values(setting);
    }
  }
}

export async function listAppSettings() {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(appSettings).orderBy(asc(appSettings.settingKey));
}

export async function updateAppSetting(settingKey: string, value: unknown) {
  const db = await getDb();
  if (!db) return;
  await db.update(appSettings).set({ value }).where(eq(appSettings.settingKey, settingKey));
}

export async function seedAchievementDefinitions() {
  const db = await getDb();
  if (!db) return;

  for (const definition of ACHIEVEMENT_DEFINITION_SEED_DATA) {
    const existing = await db.select().from(achievementDefinitions).where(eq(achievementDefinitions.key, definition.key)).limit(1);
    if (existing.length === 0) {
      await db.insert(achievementDefinitions).values(definition);
    }
  }
}

export async function listAchievementDefinitions() {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(achievementDefinitions)
    .where(eq(achievementDefinitions.isActive, 1))
    .orderBy(asc(achievementDefinitions.sortOrder), asc(achievementDefinitions.id));
}

export async function listAllAchievementDefinitions() {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(achievementDefinitions)
    .orderBy(asc(achievementDefinitions.sortOrder), asc(achievementDefinitions.id));
}

export async function createAdminAuditLog(entry: InsertAdminAuditLog) {
  const db = await getDb();
  if (!db) return;
  await db.insert(adminAuditLogs).values(entry);
}

export async function listAdminAuditLogs(limit = 100) {
  const db = await getDb();
  if (!db) return [];
  return db.select({
    id: adminAuditLogs.id,
    adminUserId: adminAuditLogs.adminUserId,
    adminName: users.name,
    actionType: adminAuditLogs.actionType,
    entityType: adminAuditLogs.entityType,
    entityId: adminAuditLogs.entityId,
    targetUserId: adminAuditLogs.targetUserId,
    payload: adminAuditLogs.payload,
    createdAt: adminAuditLogs.createdAt,
  }).from(adminAuditLogs)
    .leftJoin(users, eq(users.id, adminAuditLogs.adminUserId))
    .orderBy(desc(adminAuditLogs.createdAt))
    .limit(limit);
}

export async function listUsersForAdmin(limit = 100) {
  const db = await getDb();
  if (!db) return [];
  return db.select({
    id: users.id,
    name: users.name,
    role: users.role,
    ntrpRating: users.ntrpRating,
    totalSessions: users.totalSessions,
    totalMinutes: users.totalMinutes,
    totalShots: users.totalShots,
    currentStreak: users.currentStreak,
    longestStreak: users.longestStreak,
    createdAt: users.createdAt,
    lastSignedIn: users.lastSignedIn,
  }).from(users).orderBy(desc(users.lastSignedIn)).limit(limit);
}

export async function getAdminUserId() {
  const db = await getDb();
  if (!db) return null;
  const [admin] = await db.select().from(users).where(eq(users.role, "admin")).orderBy(desc(users.lastSignedIn)).limit(1);
  return admin?.id ?? null;
}

export async function listAllBackgroundTasks(limit = 100) {
  const db = await getDb();
  if (!db) return [];
  return db.select({
    id: backgroundTasks.id,
    userId: backgroundTasks.userId,
    userName: users.name,
    type: backgroundTasks.type,
    status: backgroundTasks.status,
    title: backgroundTasks.title,
    message: backgroundTasks.message,
    progress: backgroundTasks.progress,
    payload: backgroundTasks.payload,
    result: backgroundTasks.result,
    error: backgroundTasks.error,
    attempts: backgroundTasks.attempts,
    maxAttempts: backgroundTasks.maxAttempts,
    createdAt: backgroundTasks.createdAt,
    updatedAt: backgroundTasks.updatedAt,
    completedAt: backgroundTasks.completedAt,
  }).from(backgroundTasks)
    .leftJoin(users, eq(users.id, backgroundTasks.userId))
    .orderBy(desc(backgroundTasks.createdAt))
    .limit(limit);
}

export async function hasRecentBackgroundTaskOfType(
  type: "ntrp_refresh_user" | "ntrp_refresh_all",
  since: Date,
) {
  const db = await getDb();
  if (!db) return false;
  const result = await db.select({ count: sql<number>`count(*)` }).from(backgroundTasks)
    .where(and(eq(backgroundTasks.type, type), gte(backgroundTasks.createdAt, since)));
  return (result[0]?.count || 0) > 0;
}

export async function listUserIds() {
  const db = await getDb();
  if (!db) return [];
  return db.select({ id: users.id }).from(users).orderBy(asc(users.id));
}

// ===== USER OPERATIONS =====

export async function upsertUser(user: InsertUser): Promise<void> {
  if (!user.openId) throw new Error("User openId is required for upsert");
  const db = await getDb();
  if (!db) { console.warn("[Database] Cannot upsert user: database not available"); return; }

  try {
    const values: InsertUser = { openId: user.openId };
    const updateSet: Record<string, unknown> = {};

    const textFields = ["name", "email", "loginMethod"] as const;
    type TextField = (typeof textFields)[number];
    const assignNullable = (field: TextField) => {
      const value = user[field];
      if (value === undefined) return;
      const normalized = value ?? null;
      values[field] = normalized;
      updateSet[field] = normalized;
    };
    textFields.forEach(assignNullable);

    if (user.lastSignedIn !== undefined) { values.lastSignedIn = user.lastSignedIn; updateSet.lastSignedIn = user.lastSignedIn; }
    if (user.role !== undefined) { values.role = user.role; updateSet.role = user.role; }
    else if (user.openId === ENV.ownerOpenId) { values.role = 'admin'; updateSet.role = 'admin'; }
    if (!values.lastSignedIn) values.lastSignedIn = new Date();
    if (Object.keys(updateSet).length === 0) updateSet.lastSignedIn = new Date();

    await db.insert(users).values(values).onDuplicateKeyUpdate({ set: updateSet });
  } catch (error) { console.error("[Database] Failed to upsert user:", error); throw error; }
}

export async function getUserByOpenId(openId: string) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(users).where(eq(users.openId, openId)).limit(1);
  return result.length > 0 ? result[0] : undefined;
}

export async function getUserById(userId: number) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(users).where(eq(users.id, userId)).limit(1);
  return result.length > 0 ? result[0] : undefined;
}

export async function getUserByUsername(username: string) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(usernameAccounts).where(eq(usernameAccounts.username, username)).limit(1);
  if (result.length === 0) return undefined;
  const userResult = await db.select().from(users).where(eq(users.id, result[0].userId)).limit(1);
  return userResult.length > 0 ? userResult[0] : undefined;
}

export function isValidRegistrationInvite(inviteCode?: string | null) {
  const expected = ENV.registrationInviteCode.trim();
  if (!expected) return true;
  return (inviteCode ?? "").trim() === expected;
}

export async function createUsernameAccount(
  username: string,
  inviteCode?: string,
): Promise<{ user: typeof users.$inferSelect; isNew: boolean }> {
  const db = await getDb();
  if (!db) throw new Error("Database not available");

  // Check if username already exists
  const existing = await db.select().from(usernameAccounts).where(eq(usernameAccounts.username, username)).limit(1);
  if (existing.length > 0) {
    const user = await db.select().from(users).where(eq(users.id, existing[0].userId)).limit(1);
    if (user.length > 0) {
      const updatedRole = ENV.adminUsernames.includes(username) ? "admin" : user[0].role;
      await db.update(users).set({ lastSignedIn: new Date(), role: updatedRole }).where(eq(users.id, user[0].id));
      return { user: { ...user[0], role: updatedRole, lastSignedIn: new Date() }, isNew: false };
    }
  }

  if (!isValidRegistrationInvite(inviteCode)) {
    throw new Error("新用户注册需要正确的邀请码");
  }

  // Create new user with username as openId
  const openId = `username_${username}_${Date.now()}`;
  await db.insert(users).values({
    openId,
    name: username,
    loginMethod: "username",
    role: ENV.adminUsernames.includes(username) ? "admin" : "user",
    lastSignedIn: new Date(),
    ntrpRating: 1.5,
    totalSessions: 0,
    totalMinutes: 0,
  });

  const newUser = await db.select().from(users).where(eq(users.openId, openId)).limit(1);
  if (newUser.length === 0) throw new Error("Failed to create user");

  await db.insert(usernameAccounts).values({ username, userId: newUser[0].id });
  return { user: newUser[0], isNew: true };
}

export async function updateUserProfile(userId: number, data: {
  skillLevel?: "beginner" | "intermediate" | "advanced";
  trainingGoals?: string;
  ntrpRating?: number;
  manualNtrpRating?: number | null;
  manualNtrpCapturedAt?: Date | null;
  heightCm?: number | null;
  weightKg?: number | null;
  sprintSpeedScore?: number | null;
  explosivePowerScore?: number | null;
  agilityScore?: number | null;
  enduranceScore?: number | null;
  flexibilityScore?: number | null;
  coreStabilityScore?: number | null;
  shoulderMobilityScore?: number | null;
  hipMobilityScore?: number | null;
  assessmentNotes?: string | null;
  totalSessions?: number;
  totalMinutes?: number;
  currentStreak?: number;
  longestStreak?: number;
  totalShots?: number;
}) {
  const db = await getDb();
  if (!db) return;
  await db.update(users).set(data).where(eq(users.id, userId));
}

export const TRAINING_PROFILE_FIELD_LABELS = {
  heightCm: "身高",
  weightKg: "体重",
  sprintSpeedScore: "速度",
  explosivePowerScore: "爆发力",
  agilityScore: "敏捷性",
  enduranceScore: "耐力",
  flexibilityScore: "柔韧性",
  coreStabilityScore: "核心稳定性",
  shoulderMobilityScore: "肩部灵活性",
  hipMobilityScore: "髋部灵活性",
  manualNtrpRating: "人工 NTRP 基线",
} as const;

export type TrainingProfileFieldKey = keyof typeof TRAINING_PROFILE_FIELD_LABELS;

const TRAINING_PROFILE_REQUIRED_FIELDS: TrainingProfileFieldKey[] = [
  "heightCm",
  "weightKg",
  "sprintSpeedScore",
  "explosivePowerScore",
  "agilityScore",
  "enduranceScore",
  "flexibilityScore",
  "coreStabilityScore",
  "shoulderMobilityScore",
  "hipMobilityScore",
];

export function getMissingTrainingProfileFields(
  user: typeof users.$inferSelect,
  hasSystemNtrp: boolean,
) {
  const missing = TRAINING_PROFILE_REQUIRED_FIELDS.filter((field) => user[field] == null);
  if (!hasSystemNtrp && user.manualNtrpRating == null) {
    missing.push("manualNtrpRating");
  }
  return missing;
}

export function getTrainingProfileStatus(
  user: typeof users.$inferSelect,
  latestSnapshot?: { rating?: number | null } | null,
) {
  const hasSystemNtrp = latestSnapshot?.rating != null;
  const missingFields = getMissingTrainingProfileFields(user, hasSystemNtrp);
  const effectiveNtrp = latestSnapshot?.rating ?? user.manualNtrpRating ?? user.ntrpRating ?? 1.5;
  const ntrpSource: "system" | "manual" | "default" = hasSystemNtrp
    ? "system"
    : user.manualNtrpRating != null
      ? "manual"
      : "default";

  return {
    hasSystemNtrp,
    isComplete: missingFields.length === 0,
    missingFields,
    effectiveNtrp,
    ntrpSource,
    assessmentSnapshot: {
      heightCm: user.heightCm ?? null,
      weightKg: user.weightKg ?? null,
      sprintSpeedScore: user.sprintSpeedScore ?? null,
      explosivePowerScore: user.explosivePowerScore ?? null,
      agilityScore: user.agilityScore ?? null,
      enduranceScore: user.enduranceScore ?? null,
      flexibilityScore: user.flexibilityScore ?? null,
      coreStabilityScore: user.coreStabilityScore ?? null,
      shoulderMobilityScore: user.shoulderMobilityScore ?? null,
      hipMobilityScore: user.hipMobilityScore ?? null,
      assessmentNotes: user.assessmentNotes ?? null,
    },
  };
}

// ===== TRAINING PLAN OPERATIONS =====

export async function createTrainingPlan(plan: InsertTrainingPlan) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  // Deactivate existing active plans
  await db.update(trainingPlans).set({ isActive: 0 }).where(and(eq(trainingPlans.userId, plan.userId), eq(trainingPlans.isActive, 1)));
  const result = await db.insert(trainingPlans).values(plan);
  return result[0].insertId;
}

export async function getUserTrainingPlans(userId: number) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(trainingPlans).where(eq(trainingPlans.userId, userId)).orderBy(desc(trainingPlans.createdAt));
}

export async function getActivePlan(userId: number) {
  const db = await getDb();
  if (!db) return null;
  const result = await db.select().from(trainingPlans).where(and(eq(trainingPlans.userId, userId), eq(trainingPlans.isActive, 1))).limit(1);
  return result.length > 0 ? result[0] : null;
}

export async function updateTrainingPlan(planId: number, data: Partial<InsertTrainingPlan>) {
  const db = await getDb();
  if (!db) return;
  await db.update(trainingPlans).set(data).where(eq(trainingPlans.id, planId));
}

const PLAN_KEYWORDS: Record<string, string[]> = {
  forehand: ["正手", "forehand"],
  backhand: ["反手", "backhand"],
  serve: ["发球", "serve"],
  volley: ["截击", "volley"],
  overhead: ["高压", "overhead"],
  slice: ["切削", "slice"],
  lob: ["挑高", "lob"],
  unknown: ["综合", "基础", "训练"],
};

export async function matchActivePlanForExercise(userId: number, exerciseType?: string | null) {
  const activePlan = await getActivePlan(userId);
  if (!activePlan || !exerciseType) {
    return null;
  }

  const keywords = PLAN_KEYWORDS[exerciseType] ?? [exerciseType];
  const exercises = Array.isArray(activePlan.exercises) ? activePlan.exercises as Array<Record<string, unknown>> : [];
  const matched = exercises.find((exercise) => {
    const haystack = JSON.stringify(exercise).toLowerCase();
    return keywords.some(keyword => haystack.includes(keyword.toLowerCase()));
  });

  if (!matched) {
    return null;
  }

  return {
    planId: activePlan.id,
    confidence: 0.72,
    matchedExercise: matched,
  };
}

// ===== VIDEO OPERATIONS =====

export async function createVideo(video: InsertTrainingVideo) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const result = await db.insert(trainingVideos).values(video);
  return result[0].insertId;
}

export async function getUserVideos(userId: number) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(trainingVideos).where(eq(trainingVideos.userId, userId)).orderBy(desc(trainingVideos.createdAt));
}

export async function getVideoById(videoId: number) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(trainingVideos).where(eq(trainingVideos.id, videoId)).limit(1);
  return result.length > 0 ? result[0] : undefined;
}

export async function getUserVideoById(userId: number, videoId: number) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(trainingVideos)
    .where(and(eq(trainingVideos.userId, userId), eq(trainingVideos.id, videoId)))
    .limit(1);
  return result.length > 0 ? result[0] : undefined;
}

export async function getVideoByFileKey(userId: number, fileKey: string) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(trainingVideos)
    .where(and(eq(trainingVideos.userId, userId), eq(trainingVideos.fileKey, fileKey)))
    .limit(1);
  return result.length > 0 ? result[0] : undefined;
}

export async function updateVideoStatus(videoId: number, status: "pending" | "analyzing" | "completed" | "failed") {
  const db = await getDb();
  if (!db) return;
  await db.update(trainingVideos).set({ analysisStatus: status }).where(eq(trainingVideos.id, videoId));
}

export async function updateUserVideo(
  userId: number,
  videoId: number,
  patch: {
    title?: string;
    exerciseType?: string | null;
  },
) {
  const db = await getDb();
  if (!db) return false;

  const video = await getUserVideoById(userId, videoId);
  if (!video) return false;

  await db.update(trainingVideos)
    .set({
      title: patch.title ?? video.title,
      exerciseType: patch.exerciseType === undefined ? video.exerciseType : patch.exerciseType,
    })
    .where(and(eq(trainingVideos.userId, userId), eq(trainingVideos.id, videoId)));

  return true;
}

export async function deleteUserVideo(userId: number, videoId: number) {
  const db = await getDb();
  if (!db) return false;

  const video = await getUserVideoById(userId, videoId);
  if (!video) return false;

  await db.delete(poseAnalyses)
    .where(and(eq(poseAnalyses.userId, userId), eq(poseAnalyses.videoId, videoId)));

  await db.update(trainingRecords)
    .set({ videoId: null })
    .where(and(eq(trainingRecords.userId, userId), eq(trainingRecords.videoId, videoId)));

  await db.update(liveAnalysisSessions)
    .set({ videoId: null, videoUrl: null })
    .where(and(eq(liveAnalysisSessions.userId, userId), eq(liveAnalysisSessions.videoId, videoId)));

  await db.delete(trainingVideos)
    .where(and(eq(trainingVideos.userId, userId), eq(trainingVideos.id, videoId)));

  return true;
}

// ===== POSE ANALYSIS OPERATIONS =====

export async function createPoseAnalysis(analysis: InsertPoseAnalysis) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const result = await db.insert(poseAnalyses).values(analysis);
  return result[0].insertId;
}

export async function getAnalysisByVideoId(videoId: number) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(poseAnalyses).where(eq(poseAnalyses.videoId, videoId)).orderBy(desc(poseAnalyses.createdAt)).limit(1);
  return result.length > 0 ? result[0] : undefined;
}

export async function getUserAnalyses(userId: number) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(poseAnalyses).where(eq(poseAnalyses.userId, userId)).orderBy(desc(poseAnalyses.createdAt));
}

// ===== TRAINING RECORD OPERATIONS =====

export async function createTrainingRecord(record: InsertTrainingRecord) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const result = await db.insert(trainingRecords).values(record);
  return result[0].insertId;
}

export async function getUserTrainingRecords(userId: number, limit = 50) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(trainingRecords).where(eq(trainingRecords.userId, userId)).orderBy(desc(trainingRecords.trainingDate)).limit(limit);
}

export async function markRecordCompleted(recordId: number, poseScore?: number) {
  const db = await getDb();
  if (!db) return;
  await db.update(trainingRecords).set({ completed: 1, poseScore: poseScore ?? null }).where(eq(trainingRecords.id, recordId));
}

export async function upsertTrainingRecordBySource(
  record: InsertTrainingRecord & { sourceType: string; sourceId: string; userId: number }
) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");

  const existing = await db.select().from(trainingRecords)
    .where(and(
      eq(trainingRecords.userId, record.userId),
      eq(trainingRecords.sourceType, record.sourceType),
      eq(trainingRecords.sourceId, record.sourceId),
    ))
    .limit(1);

  if (existing.length > 0) {
    await db.update(trainingRecords).set(record).where(eq(trainingRecords.id, existing[0].id));
    return { recordId: existing[0].id, isNew: false };
  }

  const result = await db.insert(trainingRecords).values(record);
  return { recordId: result[0].insertId, isNew: true };
}

export async function upsertDailyTrainingAggregate(input: {
  userId: number;
  trainingDate: string;
  deltaMinutes?: number;
  deltaSessions?: number;
  deltaAnalysisCount?: number;
  deltaLiveAnalysisCount?: number;
  deltaRecordingCount?: number;
  deltaPkCount?: number;
  deltaTotalActions?: number;
  deltaEffectiveActions?: number;
  deltaUnknownActions?: number;
  score?: number | null;
  metadata?: Record<string, unknown>;
}) {
  const db = await getDb();
  if (!db) return;

  const dayKey = toDayKey(input.userId, input.trainingDate);
  const [existing] = await db.select().from(dailyTrainingAggregates)
    .where(eq(dailyTrainingAggregates.dayKey, dayKey))
    .limit(1);

  if (!existing) {
    const totalScore = input.score ?? 0;
    await db.insert(dailyTrainingAggregates).values({
      dayKey,
      userId: input.userId,
      trainingDate: input.trainingDate,
      totalMinutes: input.deltaMinutes ?? 0,
      sessionCount: input.deltaSessions ?? 0,
      analysisCount: input.deltaAnalysisCount ?? 0,
      liveAnalysisCount: input.deltaLiveAnalysisCount ?? 0,
      recordingCount: input.deltaRecordingCount ?? 0,
      pkCount: input.deltaPkCount ?? 0,
      totalActions: input.deltaTotalActions ?? 0,
      effectiveActions: input.deltaEffectiveActions ?? 0,
      unknownActions: input.deltaUnknownActions ?? 0,
      totalScore,
      averageScore: totalScore > 0 ? totalScore / Math.max(1, input.deltaSessions ?? 1) : 0,
      metadata: input.metadata ?? null,
    });
  } else {
    const nextSessionCount = (existing.sessionCount || 0) + (input.deltaSessions ?? 0);
    const nextTotalScore = (existing.totalScore || 0) + (input.score ?? 0);
    await db.update(dailyTrainingAggregates).set({
      totalMinutes: (existing.totalMinutes || 0) + (input.deltaMinutes ?? 0),
      sessionCount: nextSessionCount,
      analysisCount: (existing.analysisCount || 0) + (input.deltaAnalysisCount ?? 0),
      liveAnalysisCount: (existing.liveAnalysisCount || 0) + (input.deltaLiveAnalysisCount ?? 0),
      recordingCount: (existing.recordingCount || 0) + (input.deltaRecordingCount ?? 0),
      pkCount: (existing.pkCount || 0) + (input.deltaPkCount ?? 0),
      totalActions: (existing.totalActions || 0) + (input.deltaTotalActions ?? 0),
      effectiveActions: (existing.effectiveActions || 0) + (input.deltaEffectiveActions ?? 0),
      unknownActions: (existing.unknownActions || 0) + (input.deltaUnknownActions ?? 0),
      totalScore: nextTotalScore,
      averageScore: nextSessionCount > 0 ? nextTotalScore / nextSessionCount : 0,
      metadata: input.metadata ? { ...(existing.metadata as Record<string, unknown> | null ?? {}), ...input.metadata } : existing.metadata,
    }).where(eq(dailyTrainingAggregates.id, existing.id));
  }

  await refreshUserTrainingSummary(input.userId);
}

export async function listDailyTrainingAggregates(userId: number, limit = 30) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(dailyTrainingAggregates)
    .where(eq(dailyTrainingAggregates.userId, userId))
    .orderBy(desc(dailyTrainingAggregates.trainingDate))
    .limit(limit);
}

export async function refreshUserTrainingSummary(userId: number) {
  const db = await getDb();
  if (!db) return;

  const records = await db.select().from(trainingRecords)
    .where(and(eq(trainingRecords.userId, userId), eq(trainingRecords.completed, 1)));
  const aggregates = await db.select().from(dailyTrainingAggregates)
    .where(eq(dailyTrainingAggregates.userId, userId))
    .orderBy(desc(dailyTrainingAggregates.trainingDate));

  const totalSessions = records.length;
  const totalMinutes = records.reduce((sum, item) => sum + (item.durationMinutes || 0), 0);
  const totalShots = aggregates.reduce((sum, item) => sum + (item.effectiveActions || 0), 0);

  let currentStreak = 0;
  const sortedDays = aggregates
    .filter(item => (item.sessionCount || 0) > 0)
    .map(item => item.trainingDate)
    .sort((a, b) => a < b ? 1 : -1);
  let cursor = new Date(`${getDateKey()}T00:00:00`);
  for (const day of sortedDays) {
    const normalized = new Date(`${day}T00:00:00`);
    const diffDays = Math.round((cursor.getTime() - normalized.getTime()) / 86400000);
    if (diffDays === 0 || diffDays === 1) {
      currentStreak += 1;
      cursor = normalized;
      continue;
    }
    if (currentStreak > 0) {
      break;
    }
    cursor = normalized;
    currentStreak = 1;
  }

  const longestStreak = Math.max(currentStreak, records.length > 0 ? (await getLongestTrainingStreak(userId)) : 0);

  await db.update(users).set({
    totalSessions,
    totalMinutes,
    totalShots,
    currentStreak,
    longestStreak,
  }).where(eq(users.id, userId));
}

async function getLongestTrainingStreak(userId: number) {
  const db = await getDb();
  if (!db) return 0;
  const aggregates = await db.select().from(dailyTrainingAggregates)
    .where(eq(dailyTrainingAggregates.userId, userId))
    .orderBy(asc(dailyTrainingAggregates.trainingDate));

  let longest = 0;
  let current = 0;
  let prev: Date | null = null;
  for (const item of aggregates) {
    if ((item.sessionCount || 0) <= 0) continue;
    const currentDate = new Date(`${item.trainingDate}T00:00:00`);
    if (!prev) {
      current = 1;
    } else {
      const diff = Math.round((currentDate.getTime() - prev.getTime()) / 86400000);
      current = diff === 1 ? current + 1 : 1;
    }
    longest = Math.max(longest, current);
    prev = currentDate;
  }
  return longest;
}

// ===== RATING HISTORY OPERATIONS =====

export async function createRatingEntry(entry: InsertRatingHistory) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const result = await db.insert(ratingHistory).values(entry);
  return result[0].insertId;
}

export async function getUserRatingHistory(userId: number, limit = 30) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(ratingHistory).where(eq(ratingHistory.userId, userId)).orderBy(desc(ratingHistory.createdAt)).limit(limit);
}

export async function createNtrpSnapshot(snapshot: InsertNtrpSnapshot) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const existing = await db.select().from(ntrpSnapshots)
    .where(eq(ntrpSnapshots.snapshotKey, snapshot.snapshotKey))
    .limit(1);
  if (existing.length > 0) {
    await db.update(ntrpSnapshots).set(snapshot).where(eq(ntrpSnapshots.id, existing[0].id));
    return existing[0].id;
  }
  const result = await db.insert(ntrpSnapshots).values(snapshot);
  return result[0].insertId;
}

export async function getLatestNtrpSnapshot(userId: number) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(ntrpSnapshots)
    .where(eq(ntrpSnapshots.userId, userId))
    .orderBy(desc(ntrpSnapshots.createdAt))
    .limit(1);
  return result[0];
}

export async function listNtrpSnapshots(userId: number, limit = 30) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(ntrpSnapshots)
    .where(eq(ntrpSnapshots.userId, userId))
    .orderBy(desc(ntrpSnapshots.createdAt))
    .limit(limit);
}

export async function createLiveAnalysisSession(session: InsertLiveAnalysisSession) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const result = await db.insert(liveAnalysisSessions).values(session);
  return result[0].insertId;
}

export async function getUserLiveAnalysisRuntime(userId: number) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(liveAnalysisRuntime)
    .where(eq(liveAnalysisRuntime.userId, userId))
    .limit(1);
  return result[0];
}

export async function upsertUserLiveAnalysisRuntime(
  userId: number,
  patch: Omit<InsertLiveAnalysisRuntime, "id" | "createdAt" | "updatedAt" | "userId">,
) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");

  const existing = await getUserLiveAnalysisRuntime(userId);
  if (existing) {
    await db.update(liveAnalysisRuntime)
      .set({
        ownerSid: patch.ownerSid ?? existing.ownerSid,
        status: patch.status ?? existing.status,
        title: patch.title ?? existing.title,
        sessionMode: patch.sessionMode ?? existing.sessionMode,
        mediaSessionId: patch.mediaSessionId === undefined ? existing.mediaSessionId : patch.mediaSessionId,
        startedAt: patch.startedAt === undefined ? existing.startedAt : patch.startedAt,
        endedAt: patch.endedAt === undefined ? existing.endedAt : patch.endedAt,
        lastHeartbeatAt: patch.lastHeartbeatAt === undefined ? existing.lastHeartbeatAt : patch.lastHeartbeatAt,
        snapshot: patch.snapshot === undefined ? existing.snapshot : patch.snapshot,
      })
      .where(eq(liveAnalysisRuntime.userId, userId));
    return getUserLiveAnalysisRuntime(userId);
  }

  const result = await db.insert(liveAnalysisRuntime).values({
    userId,
    ownerSid: patch.ownerSid ?? null,
    status: patch.status ?? "idle",
    title: patch.title ?? null,
    sessionMode: patch.sessionMode ?? "practice",
    mediaSessionId: patch.mediaSessionId ?? null,
    startedAt: patch.startedAt ?? null,
    endedAt: patch.endedAt ?? null,
    lastHeartbeatAt: patch.lastHeartbeatAt ?? null,
    snapshot: patch.snapshot ?? null,
  });

  const runtimeId = result[0].insertId;
  const rows = await db.select().from(liveAnalysisRuntime).where(eq(liveAnalysisRuntime.id, runtimeId)).limit(1);
  return rows[0];
}

export async function updateUserLiveAnalysisRuntime(
  userId: number,
  patch: Partial<Omit<InsertLiveAnalysisRuntime, "id" | "createdAt" | "updatedAt" | "userId">>,
) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const existing = await getUserLiveAnalysisRuntime(userId);
  if (!existing) return undefined;

  await db.update(liveAnalysisRuntime)
    .set({
      ownerSid: patch.ownerSid === undefined ? existing.ownerSid : patch.ownerSid,
      status: patch.status ?? existing.status,
      title: patch.title === undefined ? existing.title : patch.title,
      sessionMode: patch.sessionMode ?? existing.sessionMode,
      mediaSessionId: patch.mediaSessionId === undefined ? existing.mediaSessionId : patch.mediaSessionId,
      startedAt: patch.startedAt === undefined ? existing.startedAt : patch.startedAt,
      endedAt: patch.endedAt === undefined ? existing.endedAt : patch.endedAt,
      lastHeartbeatAt: patch.lastHeartbeatAt === undefined ? existing.lastHeartbeatAt : patch.lastHeartbeatAt,
      snapshot: patch.snapshot === undefined ? existing.snapshot : patch.snapshot,
    })
    .where(eq(liveAnalysisRuntime.userId, userId));

  return getUserLiveAnalysisRuntime(userId);
}

export async function updateLiveAnalysisRuntimeHeartbeat(input: {
  userId: number;
  ownerSid: string;
  runtimeId: number;
  mediaSessionId?: string | null;
  snapshot?: unknown;
}) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");

  const existing = await getUserLiveAnalysisRuntime(input.userId);
  if (!existing || existing.id !== input.runtimeId || existing.ownerSid !== input.ownerSid || existing.status !== "active") {
    return undefined;
  }

  await db.update(liveAnalysisRuntime)
    .set({
      mediaSessionId: input.mediaSessionId === undefined ? existing.mediaSessionId : input.mediaSessionId,
      snapshot: input.snapshot === undefined ? existing.snapshot : input.snapshot,
      lastHeartbeatAt: new Date(),
      endedAt: null,
    })
    .where(and(
      eq(liveAnalysisRuntime.userId, input.userId),
      eq(liveAnalysisRuntime.id, input.runtimeId),
    ));

  return getUserLiveAnalysisRuntime(input.userId);
}

export async function endUserLiveAnalysisRuntime(input: {
  userId: number;
  ownerSid?: string | null;
  runtimeId?: number;
  snapshot?: unknown;
}) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");

  const existing = await getUserLiveAnalysisRuntime(input.userId);
  if (!existing) return undefined;
  if (input.runtimeId != null && existing.id !== input.runtimeId) return undefined;
  if (input.ownerSid != null && existing.ownerSid !== input.ownerSid) return undefined;

  await db.update(liveAnalysisRuntime)
    .set({
      status: "ended",
      mediaSessionId: null,
      endedAt: new Date(),
      snapshot: input.snapshot === undefined ? existing.snapshot : input.snapshot,
    })
    .where(eq(liveAnalysisRuntime.userId, input.userId));

  return getUserLiveAnalysisRuntime(input.userId);
}

export async function createLiveActionSegments(segments: InsertLiveActionSegment[]) {
  const db = await getDb();
  if (!db || segments.length === 0) return;
  await db.insert(liveActionSegments).values(segments);
}

export async function listLiveAnalysisSessions(userId: number, limit = 20) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(liveAnalysisSessions)
    .where(eq(liveAnalysisSessions.userId, userId))
    .orderBy(desc(liveAnalysisSessions.createdAt))
    .limit(limit);
}

export async function listAdminLiveAnalysisSessions(limit = 50) {
  const db = await getDb();
  if (!db) return [];
  return db.select({
    id: liveAnalysisSessions.id,
    userId: liveAnalysisSessions.userId,
    userName: users.name,
    title: liveAnalysisSessions.title,
    sessionMode: liveAnalysisSessions.sessionMode,
    status: liveAnalysisSessions.status,
    dominantAction: liveAnalysisSessions.dominantAction,
    overallScore: liveAnalysisSessions.overallScore,
    durationMs: liveAnalysisSessions.durationMs,
    effectiveSegments: liveAnalysisSessions.effectiveSegments,
    totalSegments: liveAnalysisSessions.totalSegments,
    videoUrl: liveAnalysisSessions.videoUrl,
    createdAt: liveAnalysisSessions.createdAt,
  }).from(liveAnalysisSessions)
    .leftJoin(users, eq(users.id, liveAnalysisSessions.userId))
    .orderBy(desc(liveAnalysisSessions.createdAt))
    .limit(limit);
}

export async function getLiveAnalysisSessionById(sessionId: number) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(liveAnalysisSessions)
    .where(eq(liveAnalysisSessions.id, sessionId))
    .limit(1);
  return result[0];
}

export async function getLiveActionSegmentsBySessionId(sessionId: number) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(liveActionSegments)
    .where(eq(liveActionSegments.sessionId, sessionId))
    .orderBy(asc(liveActionSegments.startMs));
}

export async function getAchievementProgress(userId: number) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(userAchievements)
    .where(eq(userAchievements.userId, userId))
    .orderBy(desc(userAchievements.unlockedAt), asc(userAchievements.achievementKey));
}

// ===== DAILY CHECK-IN OPERATIONS =====

export async function checkinToday(userId: number, notes?: string, minutesTrained?: number) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");

  const today = new Date().toISOString().slice(0, 10);

  // Check if already checked in today
  const existing = await db.select().from(dailyCheckins)
    .where(and(eq(dailyCheckins.userId, userId), eq(dailyCheckins.checkinDate, today)))
    .limit(1);
  if (existing.length > 0) {
    return { alreadyCheckedIn: true, streak: existing[0].streakCount };
  }

  // Get yesterday's check-in to calculate streak
  const yesterday = new Date(Date.now() - 86400000).toISOString().slice(0, 10);
  const yesterdayCheckin = await db.select().from(dailyCheckins)
    .where(and(eq(dailyCheckins.userId, userId), eq(dailyCheckins.checkinDate, yesterday)))
    .limit(1);

  const newStreak = yesterdayCheckin.length > 0 ? (yesterdayCheckin[0].streakCount + 1) : 1;

  await db.insert(dailyCheckins).values({
    userId,
    checkinDate: today,
    streakCount: newStreak,
    notes: notes ?? null,
    minutesTrained: minutesTrained ?? 0,
  });

  // Update user streak
  const [userRow] = await db.select().from(users).where(eq(users.id, userId)).limit(1);
  const longestStreak = Math.max(userRow?.longestStreak || 0, newStreak);
  await db.update(users).set({ currentStreak: newStreak, longestStreak }).where(eq(users.id, userId));

  return { alreadyCheckedIn: false, streak: newStreak };
}

export async function getUserCheckins(userId: number, limit = 60) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(dailyCheckins)
    .where(eq(dailyCheckins.userId, userId))
    .orderBy(desc(dailyCheckins.checkinDate))
    .limit(limit);
}

export async function getTodayCheckin(userId: number) {
  const db = await getDb();
  if (!db) return null;
  const today = new Date().toISOString().slice(0, 10);
  const result = await db.select().from(dailyCheckins)
    .where(and(eq(dailyCheckins.userId, userId), eq(dailyCheckins.checkinDate, today)))
    .limit(1);
  return result.length > 0 ? result[0] : null;
}

function metricValueFromContext(metricKey: string, context: {
  trainingDays: number;
  currentStreak: number;
  totalMinutes: number;
  effectiveActions: number;
  recordingCount: number;
  analysisCount: number;
  liveAnalysisCount: number;
  bestScore: number;
  ntrpRating: number;
  pkCount: number;
  planMatches: number;
  tutorialCompletedCount: number;
  aiDeployCompletedCount: number;
  aiTestingCompletedCount: number;
}) {
  const metricMap: Record<string, number> = {
    training_days: context.trainingDays,
    current_streak: context.currentStreak,
    total_minutes: context.totalMinutes,
    effective_actions: context.effectiveActions,
    recording_count: context.recordingCount,
    analysis_count: context.analysisCount,
    live_analysis_count: context.liveAnalysisCount,
    best_score: context.bestScore,
    ntrp_rating: context.ntrpRating,
    pk_count: context.pkCount,
    plan_matches: context.planMatches,
    tutorial_completed_count: context.tutorialCompletedCount,
    ai_deploy_completed_count: context.aiDeployCompletedCount,
    ai_testing_completed_count: context.aiTestingCompletedCount,
  };
  return metricMap[metricKey] ?? 0;
}

export async function refreshAchievementsForUser(userId: number) {
  const db = await getDb();
  if (!db) return [];

  const definitions = await listAchievementDefinitions();
  const progressRows = await getAchievementProgress(userId);
  const records = await db.select().from(trainingRecords).where(and(eq(trainingRecords.userId, userId), eq(trainingRecords.completed, 1)));
  const aggregates = await db.select().from(dailyTrainingAggregates).where(eq(dailyTrainingAggregates.userId, userId));
  const liveSessions = await db.select().from(liveAnalysisSessions).where(eq(liveAnalysisSessions.userId, userId));
  const tutorialRows = await db.select({
    id: tutorialVideos.id,
    topicArea: tutorialVideos.topicArea,
  }).from(tutorialVideos);
  const tutorialProgressRows = await db.select().from(tutorialProgress).where(eq(tutorialProgress.userId, userId));
  const [userRow] = await db.select().from(users).where(eq(users.id, userId)).limit(1);

  const tutorialTopicById = new Map(tutorialRows.map((row) => [row.id, row.topicArea || "tennis_skill"]));
  const completedTutorials = tutorialProgressRows.filter((row) => row.completed === 1 || row.watched === 1);
  const tutorialCompletedCount = completedTutorials.filter((row) => {
    const topicArea = tutorialTopicById.get(row.tutorialId);
    return topicArea === "ai_deploy" || topicArea === "ai_testing";
  }).length;
  const aiDeployCompletedCount = completedTutorials.filter((row) => tutorialTopicById.get(row.tutorialId) === "ai_deploy").length;
  const aiTestingCompletedCount = completedTutorials.filter((row) => tutorialTopicById.get(row.tutorialId) === "ai_testing").length;

  const bestScore = Math.max(
    0,
    ...records.map((record) => record.poseScore || 0),
    ...liveSessions.map((session) => session.overallScore || 0),
  );
  const planMatches = records.filter((record) => record.linkedPlanId != null).length;
  const context = {
    trainingDays: aggregates.filter(item => (item.sessionCount || 0) > 0).length,
    currentStreak: userRow?.currentStreak || 0,
    totalMinutes: userRow?.totalMinutes || 0,
    effectiveActions: userRow?.totalShots || 0,
    recordingCount: records.filter(record => record.sourceType === "recording").length,
    analysisCount: records.filter(record => record.sourceType === "analysis_upload").length,
    liveAnalysisCount: records.filter(record => record.sourceType === "live_analysis").length,
    bestScore,
    ntrpRating: userRow?.ntrpRating || 1.5,
    pkCount: records.filter(record => ((record.metadata as Record<string, unknown> | null)?.sessionMode) === "pk").length,
    planMatches,
    tutorialCompletedCount,
    aiDeployCompletedCount,
    aiTestingCompletedCount,
  };

  const unlockedKeys: string[] = [];
  for (const definition of definitions) {
    const currentValue = metricValueFromContext(definition.metricKey, context);
    const progressPct = definition.targetValue > 0 ? Math.min(100, (currentValue / definition.targetValue) * 100) : 0;
    const progressKey = `${userId}:${definition.key}`;
    const existing = progressRows.find((row) => row.achievementKey === definition.key);
    const unlockedAt = currentValue >= definition.targetValue ? (existing?.unlockedAt ?? new Date()) : null;

    if (!existing) {
      await db.insert(userAchievements).values({
        progressKey,
        userId,
        achievementKey: definition.key,
        currentValue,
        progressPct,
        unlockedAt,
      });
      if (unlockedAt) unlockedKeys.push(definition.key);
    } else {
      await db.update(userAchievements).set({
        currentValue,
        progressPct,
        unlockedAt: existing.unlockedAt ?? unlockedAt,
        lastEvaluatedAt: new Date(),
      }).where(eq(userAchievements.id, existing.id));
      if (!existing.unlockedAt && unlockedAt) unlockedKeys.push(definition.key);
    }
  }

  return unlockedKeys;
}

export async function listUserAchievements(userId: number) {
  const db = await getDb();
  if (!db) return [];

  const definitions = await listAllAchievementDefinitions();
  const progress = await getAchievementProgress(userId);
  const progressMap = new Map(progress.map(item => [item.achievementKey, item]));

  return definitions.map((definition) => {
    const row = progressMap.get(definition.key);
    return {
      ...definition,
      currentValue: row?.currentValue ?? 0,
      progressPct: row?.progressPct ?? 0,
      unlockedAt: row?.unlockedAt ?? null,
      unlocked: Boolean(row?.unlockedAt),
    };
  });
}

// ===== BADGE OPERATIONS =====

// Badge definitions
export const BADGE_DEFINITIONS: Record<string, { name: string; description: string; icon: string; category: string }> = {
  first_login: { name: "初来乍到", description: "首次登录Tennis Hub", icon: "🎾", category: "milestone" },
  first_training: { name: "初试身手", description: "完成第一次训练", icon: "💪", category: "training" },
  first_video: { name: "影像记录", description: "上传第一个训练视频", icon: "📹", category: "video" },
  first_analysis: { name: "AI教练", description: "完成第一次视频分析", icon: "🤖", category: "analysis" },
  streak_3: { name: "三日坚持", description: "连续打卡3天", icon: "🔥", category: "streak" },
  streak_7: { name: "一周达人", description: "连续打卡7天", icon: "⭐", category: "streak" },
  streak_14: { name: "两周勇士", description: "连续打卡14天", icon: "🏆", category: "streak" },
  streak_30: { name: "月度冠军", description: "连续打卡30天", icon: "👑", category: "streak" },
  sessions_10: { name: "十次训练", description: "累计完成10次训练", icon: "🎯", category: "training" },
  sessions_50: { name: "五十次训练", description: "累计完成50次训练", icon: "💎", category: "training" },
  sessions_100: { name: "百次训练", description: "累计完成100次训练", icon: "🌟", category: "training" },
  videos_5: { name: "视频达人", description: "上传5个训练视频", icon: "🎬", category: "video" },
  videos_20: { name: "视频大师", description: "上传20个训练视频", icon: "📽️", category: "video" },
  score_80: { name: "优秀姿势", description: "视频分析获得80分以上", icon: "🏅", category: "analysis" },
  score_90: { name: "完美姿势", description: "视频分析获得90分以上", icon: "🥇", category: "analysis" },
  ntrp_2: { name: "NTRP 2.0", description: "NTRP评分达到2.0", icon: "📈", category: "rating" },
  ntrp_3: { name: "NTRP 3.0", description: "NTRP评分达到3.0", icon: "📊", category: "rating" },
  ntrp_4: { name: "NTRP 4.0", description: "NTRP评分达到4.0", icon: "🚀", category: "rating" },
  minutes_60: { name: "一小时训练", description: "累计训练60分钟", icon: "⏱️", category: "training" },
  minutes_300: { name: "五小时训练", description: "累计训练300分钟", icon: "⏰", category: "training" },
  minutes_1000: { name: "千分钟训练", description: "累计训练1000分钟", icon: "🕐", category: "training" },
  shots_100: { name: "百球达人", description: "累计击球100次", icon: "🎾", category: "analysis" },
  shots_500: { name: "五百球大师", description: "累计击球500次", icon: "🏸", category: "analysis" },
};

export async function getUserBadges(userId: number) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(userBadges).where(eq(userBadges.userId, userId));
}

export async function awardBadge(userId: number, badgeKey: string) {
  const db = await getDb();
  if (!db) return false;

  // Check if already has this badge
  const existing = await db.select().from(userBadges)
    .where(and(eq(userBadges.userId, userId), eq(userBadges.badgeKey, badgeKey)))
    .limit(1);
  if (existing.length > 0) return false;

  await db.insert(userBadges).values({ userId, badgeKey });
  return true;
}

export async function checkAndAwardBadges(userId: number) {
  const db = await getDb();
  if (!db) return [];

  const [userRow] = await db.select().from(users).where(eq(users.id, userId)).limit(1);
  if (!userRow) return [];

  const records = await db.select().from(trainingRecords).where(eq(trainingRecords.userId, userId));
  const videos = await db.select().from(trainingVideos).where(eq(trainingVideos.userId, userId));
  const analyses = await db.select().from(poseAnalyses).where(eq(poseAnalyses.userId, userId));
  const completedRecords = records.filter(r => r.completed === 1);
  const totalMinutes = records.reduce((sum, r) => sum + (r.durationMinutes || 0), 0);
  const totalShots = analyses.reduce((sum, a) => sum + (a.shotCount || 0), 0);
  const maxScore = analyses.reduce((max, a) => Math.max(max, a.overallScore || 0), 0);
  const streak = userRow.currentStreak || 0;
  const ntrp = userRow.ntrpRating || 1.5;

  const newBadges: string[] = [];

  const checks: [boolean, string][] = [
    [true, "first_login"],
    [completedRecords.length >= 1, "first_training"],
    [videos.length >= 1, "first_video"],
    [analyses.length >= 1, "first_analysis"],
    [streak >= 3, "streak_3"],
    [streak >= 7, "streak_7"],
    [streak >= 14, "streak_14"],
    [streak >= 30, "streak_30"],
    [completedRecords.length >= 10, "sessions_10"],
    [completedRecords.length >= 50, "sessions_50"],
    [completedRecords.length >= 100, "sessions_100"],
    [videos.length >= 5, "videos_5"],
    [videos.length >= 20, "videos_20"],
    [maxScore >= 80, "score_80"],
    [maxScore >= 90, "score_90"],
    [ntrp >= 2.0, "ntrp_2"],
    [ntrp >= 3.0, "ntrp_3"],
    [ntrp >= 4.0, "ntrp_4"],
    [totalMinutes >= 60, "minutes_60"],
    [totalMinutes >= 300, "minutes_300"],
    [totalMinutes >= 1000, "minutes_1000"],
    [totalShots >= 100, "shots_100"],
    [totalShots >= 500, "shots_500"],
  ];

  for (const [condition, key] of checks) {
    if (condition) {
      const awarded = await awardBadge(userId, key);
      if (awarded) newBadges.push(key);
    }
  }

  return newBadges;
}

// ===== LEADERBOARD OPERATIONS =====

export async function getLeaderboard(sortBy: "ntrpRating" | "totalMinutes" | "totalSessions" | "totalShots" = "ntrpRating", limit = 50) {
  const db = await getDb();
  if (!db) return [];

  const sortColumn = {
    ntrpRating: users.ntrpRating,
    totalMinutes: users.totalMinutes,
    totalSessions: users.totalSessions,
    totalShots: users.totalShots,
  }[sortBy];

  return db.select({
    id: users.id,
    name: users.name,
    ntrpRating: users.ntrpRating,
    totalSessions: users.totalSessions,
    totalMinutes: users.totalMinutes,
    totalShots: users.totalShots,
    currentStreak: users.currentStreak,
    longestStreak: users.longestStreak,
    skillLevel: users.skillLevel,
    createdAt: users.createdAt,
  }).from(users).orderBy(desc(sortColumn)).limit(limit);
}

// ===== VISION REFERENCE LIBRARY =====

export const VISION_REFERENCE_SEED_DATA: Omit<
  InsertVisionReferenceImage,
  "id" | "createdAt" | "updatedAt"
>[] = [
  {
    slug: "commons-forehand-tennispictures",
    title: "标准图：正手挥拍",
    exerciseType: "forehand",
    imageUrl: "https://commons.wikimedia.org/wiki/Special:FilePath/Forehand.jpg",
    sourcePageUrl: "https://commons.wikimedia.org/wiki/File:Forehand.jpg",
    sourceLabel: "Wikimedia Commons",
    author: "Tennispictures",
    license: "CC0 1.0",
    expectedFocus: ["引拍完整", "击球臂路径", "肩髋转动", "重心转移"],
    tags: ["forehand", "reference", "commons", "stroke"],
    notes: "用于检测模型对正手引拍、发力和随挥阶段的描述能力。",
    sortOrder: 1,
    isPublished: 1,
  },
  {
    slug: "commons-backhand-federer",
    title: "标准图：反手挥拍",
    exerciseType: "backhand",
    imageUrl: "https://commons.wikimedia.org/wiki/Special:FilePath/Backhand_Federer.jpg",
    sourcePageUrl: "https://commons.wikimedia.org/wiki/File:Backhand_Federer.jpg",
    sourceLabel: "Wikimedia Commons",
    author: "Ian Gampon",
    license: "CC BY 2.0",
    expectedFocus: ["非持拍手收回", "躯干旋转", "拍面路径", "击球点位置"],
    tags: ["backhand", "reference", "commons", "stroke"],
    notes: "用于检测模型对单反/反手击球阶段和身体协同的判断。",
    sortOrder: 2,
    isPublished: 1,
  },
  {
    slug: "commons-serena-serve",
    title: "标准图：发球",
    exerciseType: "serve",
    imageUrl: "https://commons.wikimedia.org/wiki/Special:FilePath/Serena_Williams_Serves.JPG",
    sourcePageUrl: "https://commons.wikimedia.org/wiki/File:Serena_Williams_Serves.JPG",
    sourceLabel: "Wikimedia Commons",
    author: "Clavecin",
    license: "Public Domain",
    expectedFocus: ["抛球与击球点", "肩肘链条", "躯干伸展", "落地重心"],
    tags: ["serve", "reference", "commons", "overhead"],
    notes: "用于检测模型对发球上举、鞭打和击球点的识别能力。",
    sortOrder: 3,
    isPublished: 1,
  },
  {
    slug: "commons-volley-lewis",
    title: "标准图：网前截击",
    exerciseType: "volley",
    imageUrl: "https://commons.wikimedia.org/wiki/Special:FilePath/Ernest_w._lewis,_volleying.jpg",
    sourcePageUrl: "https://commons.wikimedia.org/wiki/File:Ernest_w._lewis,_volleying.jpg",
    sourceLabel: "Wikimedia Commons",
    author: "Unknown author",
    license: "Public Domain",
    expectedFocus: ["拍头稳定", "准备姿态", "身体前压", "短促触球"],
    tags: ["volley", "reference", "commons", "net-play"],
    notes: "用于检测模型对截击站位和紧凑击球结构的识别能力。",
    sortOrder: 4,
    isPublished: 1,
  },
  {
    slug: "commons-tiafoe-backhand",
    title: "标准图：现代反手参考",
    exerciseType: "backhand",
    imageUrl: "https://commons.wikimedia.org/wiki/Special:FilePath/Frances_Tiafoe_Backhand.jpg",
    sourcePageUrl: "https://commons.wikimedia.org/wiki/File:Frances_Tiafoe_Backhand.jpg",
    sourceLabel: "Wikimedia Commons",
    author: null,
    license: "Wikimedia Commons file license",
    expectedFocus: ["双手协同", "脚步支撑", "肩髋分离", "随挥方向"],
    tags: ["backhand", "reference", "commons", "modern"],
    notes: "补充现代职业选手反手样本，便于比较传统与现代动作语言。",
    sortOrder: 5,
    isPublished: 1,
  },
];

export async function seedVisionReferenceImages() {
  const db = await getDb();
  if (!db) return;

  const existing = await db.select().from(visionReferenceImages).limit(1);
  if (existing.length > 0) return;

  for (const item of VISION_REFERENCE_SEED_DATA) {
    await db.insert(visionReferenceImages).values(item);
  }
}

export async function listVisionReferenceImages() {
  const db = await getDb();
  if (!db) return [];

  return db.select().from(visionReferenceImages)
    .where(eq(visionReferenceImages.isPublished, 1))
    .orderBy(asc(visionReferenceImages.sortOrder), asc(visionReferenceImages.id));
}

export async function getVisionReferenceImageById(id: number) {
  const db = await getDb();
  if (!db) return undefined;

  const result = await db.select().from(visionReferenceImages)
    .where(eq(visionReferenceImages.id, id))
    .limit(1);
  return result[0];
}

export async function createVisionTestRun(run: InsertVisionTestRun) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const result = await db.insert(visionTestRuns).values(run);
  return result[0].insertId;
}

export async function listVisionTestRuns(userId?: number, limit = 50) {
  const db = await getDb();
  if (!db) return [];

  const query = db.select({
    id: visionTestRuns.id,
    taskId: visionTestRuns.taskId,
    userId: visionTestRuns.userId,
    userName: users.name,
    referenceImageId: visionTestRuns.referenceImageId,
    referenceTitle: visionReferenceImages.title,
    title: visionTestRuns.title,
    exerciseType: visionTestRuns.exerciseType,
    imageUrl: visionTestRuns.imageUrl,
    status: visionTestRuns.status,
    visionStatus: visionTestRuns.visionStatus,
    configuredModel: visionTestRuns.configuredModel,
    expectedFocus: visionTestRuns.expectedFocus,
    summary: visionTestRuns.summary,
    corrections: visionTestRuns.corrections,
    report: visionTestRuns.report,
    warning: visionTestRuns.warning,
    error: visionTestRuns.error,
    createdAt: visionTestRuns.createdAt,
    updatedAt: visionTestRuns.updatedAt,
  }).from(visionTestRuns)
    .leftJoin(users, eq(users.id, visionTestRuns.userId))
    .leftJoin(visionReferenceImages, eq(visionReferenceImages.id, visionTestRuns.referenceImageId))
    .orderBy(desc(visionTestRuns.createdAt))
    .limit(limit);

  if (userId == null) {
    return query;
  }

  return db.select({
    id: visionTestRuns.id,
    taskId: visionTestRuns.taskId,
    userId: visionTestRuns.userId,
    userName: users.name,
    referenceImageId: visionTestRuns.referenceImageId,
    referenceTitle: visionReferenceImages.title,
    title: visionTestRuns.title,
    exerciseType: visionTestRuns.exerciseType,
    imageUrl: visionTestRuns.imageUrl,
    status: visionTestRuns.status,
    visionStatus: visionTestRuns.visionStatus,
    configuredModel: visionTestRuns.configuredModel,
    expectedFocus: visionTestRuns.expectedFocus,
    summary: visionTestRuns.summary,
    corrections: visionTestRuns.corrections,
    report: visionTestRuns.report,
    warning: visionTestRuns.warning,
    error: visionTestRuns.error,
    createdAt: visionTestRuns.createdAt,
    updatedAt: visionTestRuns.updatedAt,
  }).from(visionTestRuns)
    .leftJoin(users, eq(users.id, visionTestRuns.userId))
    .leftJoin(visionReferenceImages, eq(visionReferenceImages.id, visionTestRuns.referenceImageId))
    .where(eq(visionTestRuns.userId, userId))
    .orderBy(desc(visionTestRuns.createdAt))
    .limit(limit);
}

export async function getVisionTestRunById(runId: number) {
  const db = await getDb();
  if (!db) return null;

  const [row] = await db.select({
    id: visionTestRuns.id,
    taskId: visionTestRuns.taskId,
    userId: visionTestRuns.userId,
    status: visionTestRuns.status,
    visionStatus: visionTestRuns.visionStatus,
    title: visionTestRuns.title,
  }).from(visionTestRuns)
    .where(eq(visionTestRuns.id, runId))
    .limit(1);

  return row || null;
}

export async function listRepairableVisionTestRuns(limit = 50) {
  const db = await getDb();
  if (!db) return [];

  return db.select({
    id: visionTestRuns.id,
    taskId: visionTestRuns.taskId,
    userId: visionTestRuns.userId,
    title: visionTestRuns.title,
    status: visionTestRuns.status,
    visionStatus: visionTestRuns.visionStatus,
  }).from(visionTestRuns)
    .where(or(eq(visionTestRuns.visionStatus, "fallback"), eq(visionTestRuns.status, "failed")))
    .orderBy(desc(visionTestRuns.createdAt))
    .limit(limit);
}

export async function resetVisionTestRun(taskId: string) {
  const db = await getDb();
  if (!db) return;

  await db.update(visionTestRuns).set({
    status: "queued",
    visionStatus: "pending",
    summary: null,
    corrections: null,
    report: null,
    warning: null,
    error: null,
  }).where(eq(visionTestRuns.taskId, taskId));
}

export async function completeVisionTestRun(taskId: string, data: {
  visionStatus: "ok" | "fallback";
  summary?: string | null;
  corrections: string;
  report?: unknown;
  warning?: string | null;
}) {
  const db = await getDb();
  if (!db) return;

  await db.update(visionTestRuns).set({
    status: "succeeded",
    visionStatus: data.visionStatus,
    summary: data.summary ?? null,
    corrections: data.corrections,
    report: data.report ?? null,
    warning: data.warning ?? null,
    error: null,
  }).where(eq(visionTestRuns.taskId, taskId));
}

export async function failVisionTestRun(taskId: string, error: string) {
  const db = await getDb();
  if (!db) return;

  await db.update(visionTestRuns).set({
    status: "failed",
    visionStatus: "failed",
    error,
  }).where(eq(visionTestRuns.taskId, taskId));
}

// ===== TUTORIAL OPERATIONS =====

function tutorialSection(title: string, items: string[]) {
  return { title, items };
}

const TENNIS_TUTORIAL_BASE = [
  {
    slug: "forehand-fundamentals",
    title: "正手击球基础",
    category: "forehand",
    skillLevel: "beginner" as const,
    description: "学习正手击球的基本站位、握拍方式和挥拍轨迹，建立稳定的正手基础。",
    keyPoints: ["东方式或半西方式握拍", "侧身引拍，肩膀转动90度", "从低到高的挥拍轨迹", "随挥至对侧肩膀", "重心转移从后脚到前脚"],
    commonMistakes: ["手腕过度发力", "没有转体", "击球点太靠后", "随挥不充分"],
    duration: 300,
    sortOrder: 101,
  },
  {
    slug: "backhand-fundamentals",
    title: "反手击球基础",
    category: "backhand",
    skillLevel: "beginner" as const,
    description: "掌握单手和双手反手的核心技术，包括握拍转换和击球时机。",
    keyPoints: ["双手反手更适合初学者", "早引拍，肩膀充分转动", "击球点在身体前方", "保持手臂伸展"],
    commonMistakes: ["只用手臂发力", "击球点太迟", "缺少随挥", "脚步不到位"],
    duration: 300,
    sortOrder: 102,
  },
  {
    slug: "serve-fundamentals",
    title: "发球技术",
    category: "serve",
    skillLevel: "beginner" as const,
    description: "从抛球、引拍到击球的完整发球动作分解与练习。",
    keyPoints: ["稳定的抛球是关键", "大陆式握拍", "引拍时身体充分弓身", "最高点击球", "手腕内旋加速"],
    commonMistakes: ["抛球不稳定", "手臂弯曲击球", "重心没有向前", "发力时机不对"],
    duration: 360,
    sortOrder: 103,
  },
  {
    slug: "volley-fundamentals",
    title: "截击技术",
    category: "volley",
    skillLevel: "intermediate" as const,
    description: "网前截击的站位、准备姿势和击球技巧。",
    keyPoints: ["分腿弯膝准备姿势", "拍头保持在视线前方", "短促的击球动作", "步伐迎向球"],
    commonMistakes: ["挥拍幅度太大", "站位太远", "拍面角度不对", "重心太高"],
    duration: 240,
    sortOrder: 104,
  },
  {
    slug: "footwork-fundamentals",
    title: "脚步移动训练",
    category: "footwork",
    skillLevel: "beginner" as const,
    description: "网球基础脚步训练，包括分步、交叉步、滑步和回位。",
    keyPoints: ["分步判断球的方向", "交叉步快速移动", "小碎步调整位置", "击球后快速回中"],
    commonMistakes: ["脚步懒散不移动", "重心太高", "回位太慢", "没有分步"],
    duration: 240,
    sortOrder: 105,
  },
  {
    slug: "forehand-topspin",
    title: "正手上旋",
    category: "forehand",
    skillLevel: "intermediate" as const,
    description: "掌握正手上旋球的发力技巧和拍面角度控制。",
    keyPoints: ["半西方式或西方式握拍", "从低到高的刷球动作", "加速手腕内旋", "随挥结束在头部上方"],
    commonMistakes: ["拍面太开放", "没有刷球动作", "随挥不充分"],
    duration: 300,
    sortOrder: 106,
  },
  {
    slug: "serve-spin-variations",
    title: "发球变化（切削/上旋）",
    category: "serve",
    skillLevel: "advanced" as const,
    description: "高级发球技术，包括切削发球和 Kick 发球的动作要领。",
    keyPoints: ["切削发球：侧旋切球", "Kick 发球：从下到上刷球", "抛球位置根据发球类型调整", "手腕加速是关键"],
    commonMistakes: ["抛球位置没有变化", "旋转不足", "发力方向错误"],
    duration: 360,
    sortOrder: 107,
  },
  {
    slug: "shadow-swing",
    title: "影子挥拍练习",
    category: "shadow",
    skillLevel: "beginner" as const,
    description: "不需要球的挥拍练习，专注于动作轨迹和肌肉记忆。",
    keyPoints: ["慢动作分解每个环节", "关注脚步和重心转移", "对着镜子检查姿势", "逐渐加快速度"],
    commonMistakes: ["动作太快不规范", "忽略脚步", "没有完整的随挥"],
    duration: 180,
    sortOrder: 108,
  },
  {
    slug: "wall-drills",
    title: "墙壁练习技巧",
    category: "wall",
    skillLevel: "beginner" as const,
    description: "利用墙壁进行的各种练习方法，提升控球和反应能力。",
    keyPoints: ["保持适当距离", "控制力量和方向", "交替练习正反手", "注意脚步移动"],
    commonMistakes: ["力量太大控制不住", "站位太近或太远", "只练习一种击球"],
    duration: 240,
    sortOrder: 109,
  },
  {
    slug: "tennis-fitness",
    title: "体能训练",
    category: "fitness",
    skillLevel: "beginner" as const,
    description: "网球专项体能训练，提升爆发力、敏捷性和耐力。",
    keyPoints: ["核心力量训练", "下肢爆发力练习", "敏捷性梯子训练", "拉伸和灵活性"],
    commonMistakes: ["忽略热身", "训练过度", "动作不标准"],
    duration: 300,
    sortOrder: 110,
  },
  {
    slug: "match-strategy",
    title: "比赛策略基础",
    category: "strategy",
    skillLevel: "intermediate" as const,
    description: "网球比赛中的基本战术和策略运用。",
    keyPoints: ["控制球场深度", "变换节奏和方向", "利用对手弱点", "网前战术时机"],
    commonMistakes: ["打法单一", "没有计划", "心态波动大"],
    duration: 300,
    sortOrder: 111,
  },
];

const TENNIS_TUTORIAL_SEED_DATA: Omit<InsertTutorialVideo, "id">[] = TENNIS_TUTORIAL_BASE.map((tutorial) => ({
  ...tutorial,
  topicArea: "tennis_skill",
  contentFormat: "video",
  sourcePlatform: "none",
  heroSummary: tutorial.description,
  estimatedEffortMinutes: Math.round((tutorial.duration || 0) / 60),
  stepSections: [
    tutorialSection("训练目标", tutorial.keyPoints),
    tutorialSection("常见错误", tutorial.commonMistakes),
  ],
  deliverables: [
    "明确当前动作的关键检查点",
    "完成一轮自评并记录练习感受",
  ],
  relatedDocPaths: [],
  isFeatured: 0,
  featuredOrder: 0,
}));

export const TUTORIAL_SEED_DATA: Omit<InsertTutorialVideo, "id">[] = TENNIS_TUTORIAL_SEED_DATA;

export async function seedTutorials() {
  const db = await getDb();
  if (!db) return;

  const existingRows = await db.select({
    id: tutorialVideos.id,
    slug: tutorialVideos.slug,
    title: tutorialVideos.title,
  }).from(tutorialVideos);

  const bySlug = new Map(existingRows.filter((row) => row.slug).map((row) => [row.slug as string, row]));
  const byTitle = new Map(existingRows.map((row) => [row.title, row]));

  for (const tutorial of TUTORIAL_SEED_DATA) {
    const existing = (tutorial.slug ? bySlug.get(tutorial.slug) : undefined) || byTitle.get(tutorial.title);
    if (existing) {
      await db.update(tutorialVideos).set(tutorial).where(eq(tutorialVideos.id, existing.id));
      continue;
    }
    await db.insert(tutorialVideos).values(tutorial);
  }
}

async function refreshTutorialMetricsCache<T extends {
  id: number;
  sourcePlatform?: string | null;
  platformVideoId?: string | null;
  metricsFetchedAt?: Date | string | null;
  viewCount?: number | null;
  commentCount?: number | null;
  thumbnailUrl?: string | null;
}>(rows: T[]) {
  const db = await getDb();
  if (!db) return rows;

  return Promise.all(rows.map(async (row) => {
    if (!shouldRefreshTutorialMetrics(row)) return row;

    try {
      const metrics = await fetchTutorialMetrics(row.sourcePlatform || "", row.platformVideoId || "");
      if (!metrics) return row;

      const patch = {
        viewCount: metrics.viewCount ?? row.viewCount ?? null,
        commentCount: metrics.commentCount ?? row.commentCount ?? null,
        thumbnailUrl: metrics.thumbnailUrl ?? row.thumbnailUrl ?? null,
        metricsFetchedAt: metrics.fetchedAt,
      };

      await db.update(tutorialVideos).set(patch).where(eq(tutorialVideos.id, row.id));
      return { ...row, ...patch };
    } catch (error) {
      console.warn(`[TutorialMetrics] Failed to refresh tutorial ${row.id}:`, error);
      return row;
    }
  }));
}

export async function getTutorials(category?: string, skillLevel?: string, topicArea?: string) {
  const db = await getDb();
  if (!db) return [];
  let conditions = [eq(tutorialVideos.isPublished, 1)];
  if (category) conditions.push(eq(tutorialVideos.category, category));
  if (skillLevel) conditions.push(eq(tutorialVideos.skillLevel, skillLevel as any));
  if (topicArea) conditions.push(eq(tutorialVideos.topicArea, topicArea));

  const tutorials = await db.select().from(tutorialVideos)
    .where(and(...conditions))
    .orderBy(asc(tutorialVideos.featuredOrder), asc(tutorialVideos.sortOrder), asc(tutorialVideos.id));

  return refreshTutorialMetricsCache(tutorials);
}

export async function getTutorialById(id: number) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(tutorialVideos).where(eq(tutorialVideos.id, id)).limit(1);
  if (result.length === 0) return undefined;
  const [hydrated] = await refreshTutorialMetricsCache(result);
  return hydrated;
}

export async function getUserTutorialProgress(userId: number) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(tutorialProgress).where(eq(tutorialProgress.userId, userId));
}

export async function updateTutorialProgress(userId: number, tutorialId: number, data: { watched?: number; completed?: number; selfScore?: number; notes?: string; comparisonVideoId?: number }) {
  const db = await getDb();
  if (!db) return;
  const nextData: { watched?: number; completed?: number; completedAt?: Date | null; selfScore?: number; notes?: string; comparisonVideoId?: number } = { ...data };
  if (data.completed === 1 || data.watched === 1) {
    nextData.completed = 1;
    nextData.completedAt = new Date();
  } else if (data.completed === 0) {
    nextData.completedAt = null;
  }
  const existing = await db.select().from(tutorialProgress)
    .where(and(eq(tutorialProgress.userId, userId), eq(tutorialProgress.tutorialId, tutorialId)))
    .limit(1);
  if (existing.length > 0) {
    await db.update(tutorialProgress).set(nextData).where(eq(tutorialProgress.id, existing[0].id));
  } else {
    await db.insert(tutorialProgress).values({ userId, tutorialId, ...nextData });
  }
}

// ===== TRAINING REMINDER OPERATIONS =====

export async function getUserReminders(userId: number) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(trainingReminders).where(eq(trainingReminders.userId, userId)).orderBy(desc(trainingReminders.createdAt));
}

export async function createReminder(data: InsertTrainingReminder) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const result = await db.insert(trainingReminders).values(data);
  return result[0].insertId;
}

export async function updateReminder(reminderId: number, userId: number, data: Partial<InsertTrainingReminder>) {
  const db = await getDb();
  if (!db) return;
  await db.update(trainingReminders).set(data).where(and(eq(trainingReminders.id, reminderId), eq(trainingReminders.userId, userId)));
}

export async function deleteReminder(reminderId: number, userId: number) {
  const db = await getDb();
  if (!db) return;
  await db.delete(trainingReminders).where(and(eq(trainingReminders.id, reminderId), eq(trainingReminders.userId, userId)));
}

export async function toggleReminder(reminderId: number, userId: number, isActive: number) {
  const db = await getDb();
  if (!db) return;
  await db.update(trainingReminders).set({ isActive }).where(and(eq(trainingReminders.id, reminderId), eq(trainingReminders.userId, userId)));
}

// ===== NOTIFICATION OPERATIONS =====

export async function getUserNotifications(userId: number, limit = 50) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(notificationLog).where(eq(notificationLog.userId, userId)).orderBy(desc(notificationLog.createdAt)).limit(limit);
}

export async function createNotification(data: InsertNotificationLog) {
  const db = await getDb();
  if (!db) return;
  await db.insert(notificationLog).values(data);
}

export async function markNotificationRead(notificationId: number, userId: number) {
  const db = await getDb();
  if (!db) return;
  await db.update(notificationLog).set({ isRead: 1 }).where(and(eq(notificationLog.id, notificationId), eq(notificationLog.userId, userId)));
}

export async function markAllNotificationsRead(userId: number) {
  const db = await getDb();
  if (!db) return;
  await db.update(notificationLog).set({ isRead: 1 }).where(eq(notificationLog.userId, userId));
}

export async function getUnreadNotificationCount(userId: number) {
  const db = await getDb();
  if (!db) return 0;
  const result = await db.select({ count: sql<number>`count(*)` }).from(notificationLog)
    .where(and(eq(notificationLog.userId, userId), eq(notificationLog.isRead, 0)));
  return result[0]?.count || 0;
}

// ===== BACKGROUND TASK OPERATIONS =====

export async function createBackgroundTask(task: InsertBackgroundTask) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  await db.insert(backgroundTasks).values(task);
  return task.id;
}

export async function listUserBackgroundTasks(userId: number, limit = 20) {
  const db = await getDb();
  if (!db) return [];
  return db.select().from(backgroundTasks)
    .where(eq(backgroundTasks.userId, userId))
    .orderBy(desc(backgroundTasks.createdAt))
    .limit(limit);
}

export async function getBackgroundTaskById(taskId: string) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(backgroundTasks)
    .where(eq(backgroundTasks.id, taskId))
    .limit(1);
  return result[0];
}

export async function getUserBackgroundTaskById(userId: number, taskId: string) {
  const db = await getDb();
  if (!db) return undefined;
  const result = await db.select().from(backgroundTasks)
    .where(and(eq(backgroundTasks.id, taskId), eq(backgroundTasks.userId, userId)))
    .limit(1);
  return result[0];
}

export async function claimNextBackgroundTask(workerId: string) {
  const db = await getDb();
  if (!db) return null;

  const now = new Date();
  const [nextTask] = await db.select().from(backgroundTasks)
    .where(and(
      eq(backgroundTasks.status, "queued"),
      lte(backgroundTasks.runAfter, now),
      sql`${backgroundTasks.attempts} < ${backgroundTasks.maxAttempts}`,
    ))
    .orderBy(asc(backgroundTasks.runAfter), asc(backgroundTasks.createdAt))
    .limit(1);

  if (!nextTask) {
    return null;
  }

  await db.update(backgroundTasks).set({
    status: "running",
    workerId,
    attempts: sql`${backgroundTasks.attempts} + 1`,
    lockedAt: now,
    startedAt: now,
    updatedAt: now,
  }).where(eq(backgroundTasks.id, nextTask.id));

  return getBackgroundTaskById(nextTask.id);
}

export async function heartbeatBackgroundTask(taskId: string, workerId: string) {
  const db = await getDb();
  if (!db) return;
  await db.update(backgroundTasks).set({
    workerId,
    lockedAt: new Date(),
  }).where(eq(backgroundTasks.id, taskId));
}

export async function updateBackgroundTask(taskId: string, data: Partial<InsertBackgroundTask>) {
  const db = await getDb();
  if (!db) return;
  await db.update(backgroundTasks).set(data).where(eq(backgroundTasks.id, taskId));
}

export async function completeBackgroundTask(taskId: string, result: unknown, message?: string) {
  const db = await getDb();
  if (!db) return;
  await db.update(backgroundTasks).set({
    status: "succeeded",
    progress: 100,
    message: message ?? "已完成",
    result,
    error: null,
    workerId: null,
    lockedAt: null,
    completedAt: new Date(),
  }).where(eq(backgroundTasks.id, taskId));
}

export async function failBackgroundTask(taskId: string, error: string) {
  const db = await getDb();
  if (!db) return;
  await db.update(backgroundTasks).set({
    status: "failed",
    error,
    workerId: null,
    lockedAt: null,
    completedAt: new Date(),
  }).where(eq(backgroundTasks.id, taskId));
}

export async function rescheduleBackgroundTask(taskId: string, params: {
  progress?: number;
  message?: string;
  error?: string | null;
  delayMs?: number;
}) {
  const db = await getDb();
  if (!db) return;
  await db.update(backgroundTasks).set({
    status: "queued",
    progress: params.progress,
    message: params.message,
    error: params.error ?? null,
    workerId: null,
    lockedAt: null,
    runAfter: new Date(Date.now() + (params.delayMs ?? 0)),
  }).where(eq(backgroundTasks.id, taskId));
}

export async function retryBackgroundTask(userId: number, taskId: string) {
  const db = await getDb();
  if (!db) throw new Error("Database not available");
  const task = await getUserBackgroundTaskById(userId, taskId);
  if (!task) {
    throw new Error("Task not found");
  }
  await db.update(backgroundTasks).set({
    status: "queued",
    progress: 0,
    message: "任务已重新排队",
    error: null,
    result: null,
    attempts: 0,
    workerId: null,
    lockedAt: null,
    startedAt: null,
    completedAt: null,
    runAfter: new Date(),
  }).where(eq(backgroundTasks.id, taskId));
  return getBackgroundTaskById(taskId);
}

export async function failExhaustedBackgroundTasks(now: Date = new Date()) {
  const db = await getDb();
  if (!db) return;
  await db.update(backgroundTasks).set({
    status: "failed",
    progress: 100,
    message: "任务达到最大重试次数，已停止自动重试",
    error: sql`coalesce(${backgroundTasks.error}, '任务达到最大重试次数')`,
    workerId: null,
    lockedAt: null,
    completedAt: now,
  }).where(and(
    eq(backgroundTasks.status, "queued"),
    lte(backgroundTasks.runAfter, now),
    sql`${backgroundTasks.attempts} >= ${backgroundTasks.maxAttempts}`,
  ));
}

export async function requeueStaleBackgroundTasks(staleBefore: Date) {
  const db = await getDb();
  if (!db) return;
  await db.update(backgroundTasks).set({
    status: "queued",
    message: "检测到任务中断，已重新排队",
    workerId: null,
    lockedAt: null,
    runAfter: new Date(),
  }).where(and(eq(backgroundTasks.status, "running"), lte(backgroundTasks.lockedAt, staleBefore)));
}

// ===== STATS HELPERS =====

export async function getUserStats(userId: number) {
  const db = await getDb();
  if (!db) return null;

  const [userRow] = await db.select().from(users).where(eq(users.id, userId)).limit(1);
  if (!userRow) return null;

  const analyses = await db.select().from(poseAnalyses).where(eq(poseAnalyses.userId, userId));
  const records = await db.select().from(trainingRecords).where(eq(trainingRecords.userId, userId));
  const videos = await db.select().from(trainingVideos).where(eq(trainingVideos.userId, userId));
  const ratings = await db.select().from(ratingHistory).where(eq(ratingHistory.userId, userId)).orderBy(desc(ratingHistory.createdAt)).limit(30);
  const daily = await db.select().from(dailyTrainingAggregates).where(eq(dailyTrainingAggregates.userId, userId)).orderBy(desc(dailyTrainingAggregates.trainingDate)).limit(30);
  const liveSessions = await db.select().from(liveAnalysisSessions).where(eq(liveAnalysisSessions.userId, userId)).orderBy(desc(liveAnalysisSessions.createdAt)).limit(10);
  const latestSnapshot = await getLatestNtrpSnapshot(userId);
  const achievements = await listUserAchievements(userId);
  const trainingProfileStatus = getTrainingProfileStatus(userRow, latestSnapshot);

  const completedRecords = records.filter(r => r.completed === 1);
  const totalShots = Math.max(
    analyses.reduce((sum, a) => sum + (a.shotCount || 0), 0),
    daily.reduce((sum, item) => sum + (item.effectiveActions || 0), 0),
    userRow.totalShots || 0,
  );
  const avgScore = analyses.length > 0 ? analyses.reduce((sum, a) => sum + (a.overallScore || 0), 0) / analyses.length : 0;

  return {
    ntrpRating: userRow.ntrpRating || latestSnapshot?.rating || 1.5,
    totalSessions: completedRecords.length,
    totalMinutes: records.reduce((sum, r) => sum + (r.durationMinutes || 0), 0),
    totalVideos: videos.length,
    analyzedVideos: videos.filter(v => v.analysisStatus === "completed").length,
    totalShots,
    averageScore: Math.round(avgScore * 10) / 10,
    ratingHistory: ratings.reverse(),
    recentAnalyses: analyses.slice(0, 10),
    recentLiveSessions: liveSessions,
    dailyTraining: daily.reverse(),
    achievements,
    latestNtrpSnapshot: latestSnapshot ?? null,
    trainingProfileStatus,
  };
}