// 数据库连接配置
// 使用腾讯云数据库

import mysql from 'mysql2/promise'

// 数据库配置（不含database，用于创建数据库）
const dbConfigWithoutDB = {
  host: '56b4c23f6853c.gz.cdb.myqcloud.com',
  port: 14413,
  user: 'cdb_outerroot',
  password: 'Zhiqun1984',
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0,
}

// 数据库配置（含database）
const dbConfig = {
  ...dbConfigWithoutDB,
  database: 'soul_experiment',
}

// 创建连接池
let pool: mysql.Pool | null = null

export function getPool() {
  if (!pool) {
    pool = mysql.createPool(dbConfig)
  }
  return pool
}

// 创建数据库（如果不存在）
export async function createDatabaseIfNotExists() {
  const conn = await mysql.createConnection(dbConfigWithoutDB)
  try {
    await conn.execute('CREATE DATABASE IF NOT EXISTS soul_experiment CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci')
    console.log('Database soul_experiment created or already exists')
    return true
  } catch (error) {
    console.error('Error creating database:', error)
    throw error
  } finally {
    await conn.end()
  }
}

// 执行查询
export async function query<T = any>(sql: string, params?: any[]): Promise<T[]> {
  const pool = getPool()
  const [rows] = await pool.execute(sql, params)
  return rows as T[]
}

// 执行单条插入/更新/删除
export async function execute(sql: string, params?: any[]): Promise<mysql.ResultSetHeader> {
  const pool = getPool()
  const [result] = await pool.execute(sql, params)
  return result as mysql.ResultSetHeader
}

// 用户相关操作
export const userDB = {
  // 获取所有用户
  async getAll() {
    return query(`SELECT * FROM users ORDER BY created_at DESC`)
  },

  // 根据ID获取用户
  async getById(id: string) {
    const rows = await query(`SELECT * FROM users WHERE id = ?`, [id])
    return rows[0] || null
  },

  // 根据手机号获取用户
  async getByPhone(phone: string) {
    const rows = await query(`SELECT * FROM users WHERE phone = ?`, [phone])
    return rows[0] || null
  },

  // 创建用户
  async create(user: {
    id: string
    phone: string
    nickname: string
    password?: string
    is_admin?: boolean
    referral_code: string
    referred_by?: string
  }) {
    await execute(
      `INSERT INTO users (id, phone, nickname, password, is_admin, referral_code, referred_by, created_at)
       VALUES (?, ?, ?, ?, ?, ?, ?, NOW())`,
      [user.id, user.phone, user.nickname, user.password || '', user.is_admin || false, user.referral_code, user.referred_by || null]
    )
    return user
  },

  // 更新用户
  async update(id: string, updates: Partial<{
    nickname: string
    password: string
    is_admin: boolean
    has_full_book: boolean
    earnings: number
    pending_earnings: number
    withdrawn_earnings: number
    referral_count: number
    match_count_today: number
    last_match_date: string
  }>) {
    const fields: string[] = []
    const values: any[] = []
    
    Object.entries(updates).forEach(([key, value]) => {
      if (value !== undefined) {
        fields.push(`${key} = ?`)
        values.push(value)
      }
    })
    
    if (fields.length === 0) return
    
    values.push(id)
    await execute(`UPDATE users SET ${fields.join(', ')} WHERE id = ?`, values)
  },

  // 删除用户
  async delete(id: string) {
    await execute(`DELETE FROM users WHERE id = ?`, [id])
  },

  // 验证密码
  async verifyPassword(phone: string, password: string) {
    const rows = await query(`SELECT * FROM users WHERE phone = ? AND password = ?`, [phone, password])
    return rows[0] || null
  },

  // 更新匹配次数
  async updateMatchCount(userId: string) {
    const today = new Date().toISOString().split('T')[0]
    const user = await this.getById(userId)
    
    if (user?.last_match_date === today) {
      await execute(
        `UPDATE users SET match_count_today = match_count_today + 1 WHERE id = ?`,
        [userId]
      )
    } else {
      await execute(
        `UPDATE users SET match_count_today = 1, last_match_date = ? WHERE id = ?`,
        [today, userId]
      )
    }
  },

  // 获取今日匹配次数
  async getMatchCount(userId: string) {
    const today = new Date().toISOString().split('T')[0]
    const rows = await query(
      `SELECT match_count_today FROM users WHERE id = ? AND last_match_date = ?`,
      [userId, today]
    )
    return rows[0]?.match_count_today || 0
  }
}

// 购买记录相关操作
export const purchaseDB = {
  async getAll() {
    return query(`SELECT * FROM purchases ORDER BY created_at DESC`)
  },

  async getByUserId(userId: string) {
    return query(`SELECT * FROM purchases WHERE user_id = ? ORDER BY created_at DESC`, [userId])
  },

  async create(purchase: {
    id: string
    user_id: string
    type: 'section' | 'fullbook' | 'match'
    section_id?: string
    section_title?: string
    amount: number
    payment_method?: string
    referral_code?: string
    referrer_earnings?: number
    status: string
  }) {
    await execute(
      `INSERT INTO purchases (id, user_id, type, section_id, section_title, amount, payment_method, referral_code, referrer_earnings, status, created_at)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, NOW())`,
      [purchase.id, purchase.user_id, purchase.type, purchase.section_id || null, purchase.section_title || null,
       purchase.amount, purchase.payment_method || null, purchase.referral_code || null, purchase.referrer_earnings || 0, purchase.status]
    )
    return purchase
  }
}

// 分销绑定相关操作
export const distributionDB = {
  async getAllBindings() {
    return query(`SELECT * FROM referral_bindings ORDER BY bound_at DESC`)
  },

  async getBindingsByReferrer(referrerId: string) {
    return query(`SELECT * FROM referral_bindings WHERE referrer_id = ? ORDER BY bound_at DESC`, [referrerId])
  },

  async createBinding(binding: {
    id: string
    referrer_id: string
    referee_id: string
    referrer_code: string
    bound_at: string
    expires_at: string
    status: string
  }) {
    await execute(
      `INSERT INTO referral_bindings (id, referrer_id, referee_id, referrer_code, bound_at, expires_at, status)
       VALUES (?, ?, ?, ?, ?, ?, ?)`,
      [binding.id, binding.referrer_id, binding.referee_id, binding.referrer_code, binding.bound_at, binding.expires_at, binding.status]
    )
    return binding
  },

  async updateBindingStatus(id: string, status: string) {
    await execute(`UPDATE referral_bindings SET status = ? WHERE id = ?`, [status, id])
  },

  async getActiveBindingByReferee(refereeId: string) {
    const rows = await query(
      `SELECT * FROM referral_bindings WHERE referee_id = ? AND status = 'active' AND expires_at > NOW()`,
      [refereeId]
    )
    return rows[0] || null
  },

  // 佣金记录
  async getAllCommissions() {
    return query(`SELECT * FROM distribution_commissions ORDER BY created_at DESC`)
  },

  async createCommission(commission: {
    id: string
    binding_id: string
    referrer_id: string
    referee_id: string
    order_id: string
    amount: number
    commission_rate: number
    commission_amount: number
    status: string
  }) {
    await execute(
      `INSERT INTO distribution_commissions (id, binding_id, referrer_id, referee_id, order_id, amount, commission_rate, commission_amount, status, created_at)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, NOW())`,
      [commission.id, commission.binding_id, commission.referrer_id, commission.referee_id, commission.order_id,
       commission.amount, commission.commission_rate, commission.commission_amount, commission.status]
    )
    return commission
  }
}

// 提现记录相关操作
export const withdrawalDB = {
  async getAll() {
    return query(`SELECT * FROM withdrawals ORDER BY created_at DESC`)
  },

  async getByUserId(userId: string) {
    return query(`SELECT * FROM withdrawals WHERE user_id = ? ORDER BY created_at DESC`, [userId])
  },

  async create(withdrawal: {
    id: string
    user_id: string
    amount: number
    method: string
    account: string
    name: string
    status: string
  }) {
    await execute(
      `INSERT INTO withdrawals (id, user_id, amount, method, account, name, status, created_at)
       VALUES (?, ?, ?, ?, ?, ?, ?, NOW())`,
      [withdrawal.id, withdrawal.user_id, withdrawal.amount, withdrawal.method, withdrawal.account, withdrawal.name, withdrawal.status]
    )
    return withdrawal
  },

  async updateStatus(id: string, status: string) {
    const completedAt = status === 'completed' ? ', completed_at = NOW()' : ''
    await execute(`UPDATE withdrawals SET status = ?${completedAt} WHERE id = ?`, [status, id])
  }
}

// 系统设置相关操作
export const settingsDB = {
  async get() {
    const rows = await query(`SELECT * FROM settings WHERE id = 1`)
    return rows[0] || null
  },

  async update(settings: Record<string, any>) {
    const json = JSON.stringify(settings)
    await execute(
      `INSERT INTO settings (id, data, updated_at) VALUES (1, ?, NOW())
       ON DUPLICATE KEY UPDATE data = ?, updated_at = NOW()`,
      [json, json]
    )
  }
}

// book内容相关操作
export const bookDB = {
  async getAllSections() {
    return query(`SELECT * FROM book_sections ORDER BY sort_order ASC`)
  },

  async getSection(id: string) {
    const rows = await query(`SELECT * FROM book_sections WHERE id = ?`, [id])
    return rows[0] || null
  },

  async updateSection(id: string, updates: { title?: string; content?: string; price?: number; is_free?: boolean }) {
    const fields: string[] = []
    const values: any[] = []
    
    Object.entries(updates).forEach(([key, value]) => {
      if (value !== undefined) {
        fields.push(`${key} = ?`)
        values.push(value)
      }
    })
    
    if (fields.length === 0) return
    
    fields.push('updated_at = NOW()')
    values.push(id)
    await execute(`UPDATE book_sections SET ${fields.join(', ')} WHERE id = ?`, values)
  },

  async createSection(section: {
    id: string
    part_id: string
    chapter_id: string
    title: string
    content: string
    price: number
    is_free: boolean
    sort_order: number
  }) {
    await execute(
      `INSERT INTO book_sections (id, part_id, chapter_id, title, content, price, is_free, sort_order, created_at, updated_at)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, NOW(), NOW())`,
      [section.id, section.part_id, section.chapter_id, section.title, section.content, section.price, section.is_free, section.sort_order]
    )
    return section
  },

  // 导出所有章节
  async exportAll() {
    const sections = await this.getAllSections()
    return JSON.stringify(sections, null, 2)
  },

  // 导入章节
  async importSections(sectionsJson: string) {
    const sections = JSON.parse(sectionsJson)
    for (const section of sections) {
      const existing = await this.getSection(section.id)
      if (existing) {
        await this.updateSection(section.id, section)
      } else {
        await this.createSection(section)
      }
    }
    return sections.length
  }
}

// 初始化数据库表
export async function initDatabase() {
  // 先创建数据库
  await createDatabaseIfNotExists()
  
  const pool = getPool()
  
  // 用户表
  await pool.execute(`
    CREATE TABLE IF NOT EXISTS users (
      id VARCHAR(50) PRIMARY KEY,
      phone VARCHAR(20) UNIQUE NOT NULL,
      nickname VARCHAR(100) NOT NULL,
      password VARCHAR(100) DEFAULT '',
      is_admin BOOLEAN DEFAULT FALSE,
      has_full_book BOOLEAN DEFAULT FALSE,
      referral_code VARCHAR(20) UNIQUE,
      referred_by VARCHAR(20),
      earnings DECIMAL(10,2) DEFAULT 0,
      pending_earnings DECIMAL(10,2) DEFAULT 0,
      withdrawn_earnings DECIMAL(10,2) DEFAULT 0,
      referral_count INT DEFAULT 0,
      match_count_today INT DEFAULT 0,
      last_match_date DATE,
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
      INDEX idx_phone (phone),
      INDEX idx_referral_code (referral_code)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
  `)

  // 购买记录表
  await pool.execute(`
    CREATE TABLE IF NOT EXISTS purchases (
      id VARCHAR(50) PRIMARY KEY,
      user_id VARCHAR(50) NOT NULL,
      type ENUM('section', 'fullbook', 'match') NOT NULL,
      section_id VARCHAR(20),
      section_title VARCHAR(200),
      amount DECIMAL(10,2) NOT NULL,
      payment_method VARCHAR(20),
      referral_code VARCHAR(20),
      referrer_earnings DECIMAL(10,2) DEFAULT 0,
      status ENUM('pending', 'completed', 'refunded') DEFAULT 'pending',
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
      INDEX idx_user_id (user_id),
      INDEX idx_status (status)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
  `)

  // 分销绑定表
  await pool.execute(`
    CREATE TABLE IF NOT EXISTS referral_bindings (
      id VARCHAR(50) PRIMARY KEY,
      referrer_id VARCHAR(50) NOT NULL,
      referee_id VARCHAR(50) NOT NULL,
      referrer_code VARCHAR(20) NOT NULL,
      bound_at DATETIME NOT NULL,
      expires_at DATETIME NOT NULL,
      status ENUM('active', 'converted', 'expired') DEFAULT 'active',
      INDEX idx_referrer (referrer_id),
      INDEX idx_referee (referee_id),
      INDEX idx_status (status)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
  `)

  // 分销佣金表
  await pool.execute(`
    CREATE TABLE IF NOT EXISTS distribution_commissions (
      id VARCHAR(50) PRIMARY KEY,
      binding_id VARCHAR(50) NOT NULL,
      referrer_id VARCHAR(50) NOT NULL,
      referee_id VARCHAR(50) NOT NULL,
      order_id VARCHAR(50) NOT NULL,
      amount DECIMAL(10,2) NOT NULL,
      commission_rate DECIMAL(5,2) NOT NULL,
      commission_amount DECIMAL(10,2) NOT NULL,
      status ENUM('pending', 'paid', 'cancelled') DEFAULT 'pending',
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
      paid_at DATETIME,
      INDEX idx_referrer (referrer_id)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
  `)

  // 提现记录表
  await pool.execute(`
    CREATE TABLE IF NOT EXISTS withdrawals (
      id VARCHAR(50) PRIMARY KEY,
      user_id VARCHAR(50) NOT NULL,
      amount DECIMAL(10,2) NOT NULL,
      method ENUM('wechat', 'alipay') NOT NULL,
      account VARCHAR(100) NOT NULL,
      name VARCHAR(50) NOT NULL,
      status ENUM('pending', 'completed', 'rejected') DEFAULT 'pending',
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
      completed_at DATETIME,
      INDEX idx_user_id (user_id),
      INDEX idx_status (status)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
  `)

  // 系统设置表
  await pool.execute(`
    CREATE TABLE IF NOT EXISTS settings (
      id INT PRIMARY KEY,
      data JSON,
      updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
  `)

  // book章节表
  await pool.execute(`
    CREATE TABLE IF NOT EXISTS book_sections (
      id VARCHAR(20) PRIMARY KEY,
      part_id VARCHAR(20) NOT NULL,
      chapter_id VARCHAR(20) NOT NULL,
      title VARCHAR(200) NOT NULL,
      content LONGTEXT,
      price DECIMAL(10,2) DEFAULT 1,
      is_free BOOLEAN DEFAULT FALSE,
      sort_order INT DEFAULT 0,
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
      updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
      INDEX idx_part (part_id),
      INDEX idx_chapter (chapter_id)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
  `)

  console.log('Database tables initialized successfully')
}