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')
  }

  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, views_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])
  }



  for (let name of ['comment', 'praise', 'collect']) {
    console.log(`统计当天时间段内 ${name} 数到临时表`)
    await conn.query(`
    UPDATE temp_updates t
    JOIN (
        SELECT
            ${mame}_id AS article_id,
            COUNT(*) AS ${name}_count
        FROM
            web_${name}
        WHERE
            DATE(create_time) = CURDATE()
        GROUP BY
            ${field}_id
    ) stats
    ON t.id = stats.article_id
    SET t.${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 day_rank = 
      collect_count * 35 +
      praise_count * 20 +
      comment_count * 20 +
      views_count * 25;
  `)

  console.log('更新前清空当日记录')
  await conn.query(`UPDATE ${table} SET ${rank} = 0`)

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