import {
  mysqlTable,
  char,
  mysqlEnum,
  varchar,
  int,
  tinyint,
  smallint,
  decimal,
  text,
  json,
  date,
  datetime,
  uniqueIndex,
  foreignKey,
  index,
} from 'drizzle-orm/mysql-core';
import { sql } from 'drizzle-orm';

// ── Users ──────────────────────────────────────────────────────────

export const users = mysqlTable('users', {
  id: char('id', { length: 36 }).primaryKey(),
  authType: mysqlEnum('auth_type', ['huawei', 'guest', 'phone', 'apple', 'google']).notNull(),
  authId: varchar('auth_id', { length: 255 }).notNull(),
  nickname: varchar('nickname', { length: 50 }),
  avatarUrl: varchar('avatar_url', { length: 500 }),
  tier: mysqlEnum('tier', ['free', 'pro', 'proplus']).default('free'),
  xpTotal: int('xp_total').default(0),
  streakDays: int('streak_days').default(0),
  streakLastDate: date('streak_last_date'),
  heartsRemaining: tinyint('hearts_remaining').default(5),
  heartsLastRestore: datetime('hearts_last_restore'),
  dailyXpGoal: smallint('daily_xp_goal').default(50),
  dailyXpEarned: smallint('daily_xp_earned').default(0),
  dailyXpDate: date('daily_xp_date'),
  currentTheme: varchar('current_theme', { length: 20 }).default('inkTeal'),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
  updatedAt: datetime('updated_at').default(sql`CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP`),
}, (table) => [
  uniqueIndex('uk_auth').on(table.authType, table.authId),
]);

// ── Categories ─────────────────────────────────────────────────────

export const categories = mysqlTable('categories', {
  id: varchar('id', { length: 50 }).primaryKey(),
  name: varchar('name', { length: 100 }).notNull(),
  slug: varchar('slug', { length: 100 }).notNull(),
  parentId: varchar('parent_id', { length: 50 }),
  sortOrder: int('sort_order').default(0),
  questionCount: int('question_count').default(0),
  status: mysqlEnum('status', ['active', 'inactive']).default('active'),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
  updatedAt: datetime('updated_at').default(sql`CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP`),
}, (table) => [
  uniqueIndex('uk_slug').on(table.slug),
]);

// ── Questions ──────────────────────────────────────────────────────

export const questions = mysqlTable('questions', {
  id: char('id', { length: 36 }).primaryKey(),
  stem: json('stem').notNull(),
  contentType: mysqlEnum('content_type', ['text', 'image', 'video', 'audio']).notNull(),
  correctAnswer: varchar('correct_answer', { length: 500 }).notNull(),
  distractors: json('distractors').notNull(),
  categoryId: varchar('category_id', { length: 50 }).notNull(),
  difficulty: tinyint('difficulty'),
  dynamicDifficulty: decimal('dynamic_difficulty', { precision: 3, scale: 1 }),
  source: mysqlEnum('source', ['system', 'ugc']).default('system'),
  creatorId: char('creator_id', { length: 36 }),
  status: mysqlEnum('status', ['draft', 'reviewing', 'published', 'archived']).default('draft'),
  stats: json('stats').$type<{ timesAnswered: number; correctRate: number; avgTimeMs: number }>()
    .default({ timesAnswered: 0, correctRate: 0, avgTimeMs: 0 }),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
  updatedAt: datetime('updated_at').default(sql`CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP`),
}, (table) => [
  foreignKey({ columns: [table.categoryId], foreignColumns: [categories.id] }),
]);

// ── Knowledge Cards ────────────────────────────────────────────────

export const knowledgeCards = mysqlTable('knowledge_cards', {
  id: char('id', { length: 36 }).primaryKey(),
  questionId: char('question_id', { length: 36 }).notNull(),
  summary: varchar('summary', { length: 300 }).notNull(),
  deepDive: text('deep_dive'),
  sourceRef: varchar('source_ref', { length: 500 }),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
  updatedAt: datetime('updated_at').default(sql`CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP`),
}, (table) => [
  uniqueIndex('uk_question').on(table.questionId),
  foreignKey({ columns: [table.questionId], foreignColumns: [questions.id] }),
]);

// ── User Progress ──────────────────────────────────────────────────

export const userProgress = mysqlTable('user_progress', {
  id: char('id', { length: 36 }).primaryKey(),
  userId: char('user_id', { length: 36 }).notNull(),
  questionId: char('question_id', { length: 36 }).notNull(),
  correct: tinyint('correct').notNull(),
  timeMs: int('time_ms'),
  answeredAt: datetime('answered_at').default(sql`CURRENT_TIMESTAMP`),
}, (table) => [
  index('idx_user_answered').on(table.userId, table.answeredAt),
  foreignKey({ columns: [table.userId], foreignColumns: [users.id] }),
  foreignKey({ columns: [table.questionId], foreignColumns: [questions.id] }),
]);

// ── Skill Tree ─────────────────────────────────────────────────────

export const skillTree = mysqlTable('skill_tree', {
  id: char('id', { length: 36 }).primaryKey(),
  categoryId: varchar('category_id', { length: 50 }).notNull(),
  title: varchar('title', { length: 100 }).notNull(),
  parentId: char('parent_id', { length: 36 }),
  sortOrder: int('sort_order').default(0),
  questionsRequired: tinyint('questions_required').default(4),
  passThreshold: tinyint('pass_threshold').default(2),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
}, (table) => [
  foreignKey({ columns: [table.categoryId], foreignColumns: [categories.id] }),
]);

// ── User Chapter Progress ──────────────────────────────────────────

export const userChapterProgress = mysqlTable('user_chapter_progress', {
  id: char('id', { length: 36 }).primaryKey(),
  userId: char('user_id', { length: 36 }).notNull(),
  chapterId: char('chapter_id', { length: 36 }).notNull(),
  status: mysqlEnum('status', ['locked', 'unlocked', 'passed', 'perfect']).default('locked'),
  bestCorrectCount: tinyint('best_correct_count').default(0),
  attempts: int('attempts').default(0),
  completedAt: datetime('completed_at'),
}, (table) => [
  uniqueIndex('uk_user_chapter').on(table.userId, table.chapterId),
  foreignKey({ columns: [table.userId], foreignColumns: [users.id] }),
  foreignKey({ columns: [table.chapterId], foreignColumns: [skillTree.id] }),
]);

// ── Question Ratings ──────────────────────────────────────────────

export const questionRatings = mysqlTable('question_ratings', {
  id: char('id', { length: 36 }).primaryKey(),
  userId: char('user_id', { length: 36 }).notNull(),
  questionId: char('question_id', { length: 36 }).notNull(),
  rating: mysqlEnum('rating', ['good', 'bad']).notNull(),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
}, (table) => [
  uniqueIndex('uk_user_question_rating').on(table.userId, table.questionId),
]);

// ── User Feedback ──────────────────────────────────────────────────

export const userFeedback = mysqlTable('user_feedback', {
  id: char('id', { length: 36 }).primaryKey(),
  userId: char('user_id', { length: 36 }).notNull(),
  content: text('content').notNull(),
  contact: varchar('contact', { length: 255 }),
  pageContext: varchar('page_context', { length: 200 }),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
});

// ── Achievements ──────────────────────────────────────────────────

export const achievements = mysqlTable('achievements', {
  id: char('id', { length: 36 }).primaryKey(),
  type: mysqlEnum('type', ['knowledge', 'behavior']).notNull(),
  name: varchar('name', { length: 100 }).notNull(),
  description: varchar('description', { length: 300 }).notNull(),
  iconUrl: varchar('icon_url', { length: 500 }),
  condition: json('condition').notNull(),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
});

export const userAchievements = mysqlTable('user_achievements', {
  id: char('id', { length: 36 }).primaryKey(),
  userId: char('user_id', { length: 36 }).notNull(),
  achievementId: char('achievement_id', { length: 36 }).notNull(),
  unlockedAt: datetime('unlocked_at').default(sql`CURRENT_TIMESTAMP`),
}, (table) => [
  uniqueIndex('uk_user_achievement').on(table.userId, table.achievementId),
]);

// ── Leaderboard Snapshots ──────────────────────────────────────────

export const leaderboardSnapshots = mysqlTable('leaderboard_snapshots', {
  id: char('id', { length: 36 }).primaryKey(),
  userId: char('user_id', { length: 36 }).notNull(),
  tier: mysqlEnum('tier', ['bronze', 'silver', 'gold', 'platinum', 'diamond', 'master', 'grandmaster', 'champion', 'legend', 'mythic']).notNull(),
  weeklyXp: int('weekly_xp').default(0),
  rank: int('rank'),
  league: varchar('league', { length: 50 }),
  weekStart: date('week_start'),
  weekEnd: date('week_end'),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
}, (table) => [
  index('idx_user_week').on(table.userId, table.weekStart),
]);

// ── Subscriptions ──────────────────────────────────────────────────

export const subscriptions = mysqlTable('subscriptions', {
  id: char('id', { length: 36 }).primaryKey(),
  userId: char('user_id', { length: 36 }).notNull(),
  tier: mysqlEnum('tier', ['free', 'pro', 'proplus']).default('free'),
  platform: mysqlEnum('platform', ['huawei', 'apple', 'google']),
  purchaseToken: varchar('purchase_token', { length: 500 }),
  expiresAt: datetime('expires_at'),
  autoRenew: tinyint('auto_renew').default(0),
  status: mysqlEnum('status', ['active', 'expired', 'cancelled']).default('active'),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
  updatedAt: datetime('updated_at').default(sql`CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP`),
}, (table) => [
  uniqueIndex('uk_subscription_user').on(table.userId),
]);

// ── Admin Audit Log ────────────────────────────────────────────────

export const adminAuditLog = mysqlTable('admin_audit_log', {
  id: int('id').primaryKey().autoincrement(),
  adminId: varchar('admin_id', { length: 36 }).notNull(),
  action: varchar('action', { length: 10 }).notNull(),
  resource: varchar('resource', { length: 500 }),
  details: json('details'),
  ipAddress: varchar('ip_address', { length: 45 }),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
});

// ── Admin Users ───────────────────────────────────────────────────────

export const adminUsers = mysqlTable('admin_users', {
  id: char('id', { length: 36 }).primaryKey(),
  username: varchar('username', { length: 50 }).notNull(),
  passwordHash: varchar('password_hash', { length: 255 }).notNull(),
  role: mysqlEnum('role', ['admin', 'super_admin']).default('admin'),
  isActive: tinyint('is_active').default(1),
  lastLoginAt: datetime('last_login_at'),
  createdAt: datetime('created_at').default(sql`CURRENT_TIMESTAMP`),
  updatedAt: datetime('updated_at').default(sql`CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP`),
}, (table) => [
  uniqueIndex('uk_admin_username').on(table.username),
]);