import fs from 'fs'
import path from 'path'
import matter from 'gray-matter'

const KNIEPUNKT_DIR = path.join(process.cwd(), 'content', 'kniepunkt')

// 1. Delete the intro for 040
const papstIntro = path.join(KNIEPUNKT_DIR, '2026-05-30-der-papst-scheint-den-kniepunkt-auch-zu-lesen-darum-geht-es-heute-und-darum-da.md')
if (fs.existsSync(papstIntro)) {
  fs.unlinkSync(papstIntro)
  console.log('Deleted Papst intro')
}

// 2. Merge "Der neue Kniepunkt ist da" into 029
const kniepunktIntro = path.join(KNIEPUNKT_DIR, '2026-03-14-der-neue-kniepunkt-ist-da.md')
const k29Path = path.join(KNIEPUNKT_DIR, '029-ki-nudelsuppe.md')
if (fs.existsSync(kniepunktIntro) && fs.existsSync(k29Path)) {
  const intro = matter(fs.readFileSync(kniepunktIntro, 'utf8'))
  let k29 = matter(fs.readFileSync(k29Path, 'utf8'))
  if (!k29.content.includes(intro.content.trim())) {
    k29.content = `> ${intro.content.trim()}\n\n---\n\n${k29.content}`
    fs.writeFileSync(k29Path, matter.stringify(k29.content, k29.data))
    console.log('Merged intro into 029')
  }
  fs.unlinkSync(kniepunktIntro)
  console.log('Deleted Kniepunkt 029 intro')
}

// 3. Rename all Kniepunkt titles to "0[XX]: [Title]"
const allFiles = fs.readdirSync(KNIEPUNKT_DIR).filter(f => f.match(/^\d{3}-.*\.md$/))

allFiles.forEach(file => {
  const numMatch = file.match(/^(\d{3})-/)
  if (!numMatch) return
  const numStr = numMatch[1] // e.g. "012"
  
  const p = path.join(KNIEPUNKT_DIR, file)
  let data = matter(fs.readFileSync(p, 'utf8'))
  
  let currentTitle = data.data.title || ''
  
  // Clean up current title, remove existing Kniepunkt prefix if any
  currentTitle = currentTitle.replace(/^Kniepunkt\s*\d+\s*[:-]?\s*/i, '')
  currentTitle = currentTitle.replace(/^0\d{2}\s*[:-]?\s*/, '')
  currentTitle = currentTitle.trim()
  
  const newTitle = `${numStr}: ${currentTitle}`
  
  if (data.data.title !== newTitle) {
    data.data.title = newTitle
    fs.writeFileSync(p, matter.stringify(data.content, data.data))
    console.log('Renamed title for', file, 'to', newTitle)
  }
})