// 临时诊断: 检查 News 表 content/summary 的换行与长度情况 (用完即删)
require('dotenv').config()
const mysql = require('mysql2/promise')

function parseUrl(url) {
  const u = new URL(url)
  return { host: u.hostname, port: Number(u.port) || 3306, user: decodeURIComponent(u.username), password: decodeURIComponent(u.password), database: u.pathname.replace(/^\//, '') }
}

async function main() {
  const conn = await mysql.createConnection(parseUrl(process.env.DATABASE_URL))
  const [rows] = await conn.execute(
    'SELECT id, title, summary, content, CHAR_LENGTH(content) AS clen, CHAR_LENGTH(summary) AS slen FROM `News` ORDER BY id DESC LIMIT 10'
  )
  console.log('总条数检查:')
  const [[cnt]] = await conn.execute('SELECT COUNT(*) AS c, SUM(content IS NULL) AS nullContent FROM `News`')
  console.log(JSON.stringify(cnt))
  for (const r of rows) {
    const content = r.content || ''
    const summary = r.summary || ''
    const lf = (content.match(/\n/g) || []).length
    const cr = (content.match(/\r/g) || []).length
    const sLf = (summary.match(/\n/g) || []).length
    console.log('---')
    console.log('id=' + r.id + ' clen=' + r.clen + ' slen=' + r.slen + ' contentLF=' + lf + ' contentCR=' + cr + ' summaryLF=' + sLf)
    console.log('title: ' + r.title)
    console.log('summary: ' + JSON.stringify(summary.slice(0, 120)))
    console.log('content(hex首200): ' + content.slice(0, 200).replace(/[^\x20-\x7E\u4e00-\u9fa5]/g, (c) => '\\x' + c.charCodeAt(0).toString(16)))
    console.log('content(带转义首300): ' + JSON.stringify(content.slice(0, 300)))
  }
  await conn.end()
}
main().catch((e) => { console.error(e); process.exit(1) })