import fs from 'fs'
import mysql from 'mysql2/promise'


// 更新指标到数据库
export async function update(table, rank, views) {
  if (!['day_rank', 'week_rank', 'month_rank', 'year_rank', 'aeon_rank'].includes(rank)) {
    throw new Error('字段类型错误')
  }

  // 0=文章/游戏/作品 1=短视频 2=图片
  const TYPE = {
    web_images: 2,
    web_aritcle: 0
  }

  // 定义查询时间范围
  const WHERE = {
    day_rank: `WHERE create_time >= CURDATE() AND type=${TYPE[table]}`,
    week_rank: `WHERE create_time >= CURDATE() - INTERVAL 7 DAY  AND type=${TYPE[table]}`,
    month_rank: `WHERE create_time >= CURDATE() - INTERVAL 1 MONTH  AND type=${TYPE[table]}`,
    year_rank: `WHERE create_time >= CURDATE() - INTERVAL 1 YEAR  AND type=${TYPE[table]}`,
    aeon_rank: `type=${TYPE[table]}`
  }

  const { mysql: config } = JSON.parse(fs.readFileSync('config.json', 'utf8'))
  const conn = await mysql.createConnection(config)

  console.log('创建临时表')
  await conn.query(`CREATE TEMPORARY TABLE temp_updates (
    id INT PRIMARY KEY,
    rank INT UNSIGNED,
    views_count INT UNSIGNED,
    praise_count INT UNSIGNED,
    comment_count INT UNSIGNED,
    collect_count INT UNSIGNED
  )`)

  console.log(`数据总量 ${views.length} 条, 每次 10000 条写入 ${Math.ceil(views.length / 10000)} 次`)
  for (let i = 0; i < views.length; i += 10000) {
    console.log(`第 ${i / 10000 + 1} 次写入`)
    const values = views.slice(i, i + 10000)
    await conn.query(`INSERT INTO temp_updates (id, views_count) VALUES ?`, [values])
  }

  const JOIN = {
    comment: `SELECT comment_id AS id, COUNT(*) AS comment_count FROM web_comment ${WHERE[rank]} GROUP BY id`,
    praise: `SELECT praise_id AS id, COUNT(*) AS praise_count FROM web_praise ${WHERE[rank]} GROUP BY id`,
    collect: `SELECT collect_id AS id, COUNT(*) AS collect_count FROM web_collect ${WHERE[rank]} GROUP BY id`
  }

  for (let name of ['comment', 'praise', 'collect']) {
    console.log(`统计 ${rank} 时间段内 ${name} 数到临时表`)
    await conn.query(`UPDATE temp_updates t JOIN(${JOIN[name]}) stats ON t.id = stats.id SET t.${name}_count = stats.${name}_count`)
  }

  console.log('统计当天时间段内排行榜到临时表')
  await conn.query("UPDATE temp_updates SET rank = collect_count * 35 + praise_count * 20 + comment_count * 20 + views_count * 25")

  console.log('更新数据从临时表转入生产库')
  await conn.query(`UPDATE ${table} t LEFT JOIN temp_updates tu ON t.id = tu.id SET t.${rank} = IFNULL(tu.rank, 0)`)
  await conn.end()
  console.log('更新完成')
}