/**
 * Laptop-Umzug: Code + komplette V2-Dev-SQLite (ohne node_modules, .env).
 * Enthält personenbezogene Daten — nur an sich selbst / den Ziel-Laptop schicken.
 *
 * Usage: npm run pack:laptop
 */
import { mkdirSync, existsSync, rmSync, readFileSync, copyFileSync, writeFileSync } from 'node:fs'
import { dirname, join, resolve, relative } from 'node:path'
import { fileURLToPath } from 'node:url'
import { execFileSync } from 'node:child_process'

const __dirname = dirname(fileURLToPath(import.meta.url))
const projectRoot = resolve(join(__dirname, '../..'))
const outDir = join(projectRoot, 'dist-release')
const stamp = new Date().toISOString().slice(0, 10)
const zipName = `AssignmentMonitor-Umzug-${stamp}.zip`
const zipPath = join(outDir, zipName)
const stageName = 'AssigmentMonitorV2'
const stageRoot = join(outDir, '_stage-laptop', stageName)

const rootNorm = projectRoot.toLowerCase()
if (!rootNorm.includes('assigmentmonitorv2')) {
  throw new Error('[pack:laptop] SAFETY: Skript nur innerhalb AssigmentMonitorV2 ausführen.')
}

const sqliteFilename = process.env.SQLITE_FILENAME?.trim() || 'assignment-monitor-v2-dev.sqlite3'
if (sqliteFilename.includes('/') || sqliteFilename.includes('\\') || sqliteFilename.includes('..')) {
  throw new Error(`[pack:laptop] SAFETY: SQLITE_FILENAME ungültig: "${sqliteFilename}"`)
}
if (sqliteFilename === 'assignment-monitor.sqlite3') {
  throw new Error('[pack:laptop] SAFETY: Produktiv-DB-Dateiname blockiert.')
}

const dbPath = join(projectRoot, 'server', 'data', sqliteFilename)

const EXCLUDE_DIR_NAMES = new Set([
  'node_modules',
  'dist',
  'dist-release',
  'dist-ssr',
  '.vite',
  '.claude',
  '.vscode',
  '_quarantine',
  '_stage',
  '_stage-laptop',
])

const EXCLUDE_FILE_NAMES = new Set([
  '.env',
  '.env.local',
  'dist-release-log.txt',
])

function shouldSkip(absPath: string): boolean {
  const rel = relative(projectRoot, absPath).split(/[/\\]/).join('/')
  if (!rel || rel.startsWith('..')) return true
  if (rel === 'server/data' || rel.startsWith('server/data/')) return true
  if (rel === 'dist-release' || rel.startsWith('dist-release/')) return true
  const parts = rel.split('/')
  if (parts.some(p => EXCLUDE_DIR_NAMES.has(p) || p.startsWith('_quarantine'))) return true
  const base = parts[parts.length - 1] ?? ''
  if (EXCLUDE_FILE_NAMES.has(base)) return true
  if (base.endsWith('.tsbuildinfo')) return true
  if (base.startsWith('.env.') && base.endsWith('.local')) return true
  if (base.endsWith('.bak')) return true
  return false
}

async function copyTree(srcDir: string, destDir: string): Promise<number> {
  const { readdirSync, statSync, mkdirSync: mkdir, copyFileSync: cp } = await import('node:fs')
  let count = 0
  mkdir(destDir, { recursive: true })
  for (const name of readdirSync(srcDir)) {
    const src = join(srcDir, name)
    if (shouldSkip(src)) continue
    const dest = join(destDir, name)
    const st = statSync(src)
    if (st.isDirectory()) {
      count += await copyTree(src, dest)
    } else if (st.isFile()) {
      cp(src, dest)
      count++
    }
  }
  return count
}

function zipWithPowerShell(sourceFolder: string, targetZip: string): void {
  const parent = dirname(sourceFolder)
  const leaf = sourceFolder.split(/[/\\]/).pop()
  const ps = `
    $ErrorActionPreference = 'Stop'
    if (Test-Path -LiteralPath '${targetZip.replace(/'/g, "''")}') { Remove-Item -LiteralPath '${targetZip.replace(/'/g, "''")}' -Force }
    Compress-Archive -Path (Join-Path '${parent.replace(/'/g, "''")}' '${leaf}') -DestinationPath '${targetZip.replace(/'/g, "''")}' -CompressionLevel Optimal
  `
  execFileSync('powershell.exe', ['-NoProfile', '-Command', ps], { stdio: 'inherit' })
}

if (!existsSync(dbPath)) {
  throw new Error(
    `[pack:laptop] Datenbank fehlt: ${dbPath}\n` +
      'Ohne SQLite wäre das nur ein Team-Paket — zuerst die App einmal starten oder pack:zip nutzen.',
  )
}

mkdirSync(outDir, { recursive: true })
const stageParent = join(outDir, '_stage-laptop')
if (existsSync(stageParent)) rmSync(stageParent, { recursive: true, force: true })
mkdirSync(stageRoot, { recursive: true })

console.log('[pack:laptop] Kopiere Projektdateien (ohne node_modules, .env; inkl. .git) …')
const files = await copyTree(projectRoot, stageRoot)
console.log(`[pack:laptop] ${files} Dateien → Staging`)

const stageDataDir = join(stageRoot, 'server', 'data')
mkdirSync(stageDataDir, { recursive: true })
copyFileSync(dbPath, join(stageDataDir, sqliteFilename))
let extraDbFiles = 0
for (const suffix of ['-wal', '-shm']) {
  const extra = `${dbPath}${suffix}`
  if (existsSync(extra)) {
    copyFileSync(extra, join(stageDataDir, `${sqliteFilename}${suffix}`))
    extraDbFiles++
  }
}
writeFileSync(
  join(stageDataDir, 'README.txt'),
  [
    'Diese SQLite-Datei ist die vollständige lokale Datenbank (Personen, Assignments, Meetings).',
    `Datei: ${sqliteFilename}`,
    'Nach dem Entpacken NICHT npm run setup / bootstrap / db:reset ausführen.',
    '',
  ].join('\n'),
  'utf8',
)
console.log(`[pack:laptop] DB kopiert: ${sqliteFilename}${extraDbFiles ? ` (+${extraDbFiles} WAL/SHM)` : ''}`)

if (!existsSync(join(stageRoot, 'UMZUG.md'))) {
  throw new Error('[pack:laptop] UMZUG.md fehlt im Staging — Abbruch.')
}
if (!existsSync(join(stageRoot, '.env.example'))) {
  throw new Error('[pack:laptop] .env.example fehlt')
}
if (!existsSync(join(stageRoot, 'server', 'data', sqliteFilename))) {
  throw new Error('[pack:laptop] DB landete nicht im Staging — Abbruch.')
}

console.log(`[pack:laptop] Erzeuge ${zipName} …`)
zipWithPowerShell(stageRoot, zipPath)
rmSync(stageParent, { recursive: true, force: true })

const sizeMb = (readFileSync(zipPath).byteLength / (1024 * 1024)).toFixed(2)
console.log(`[pack:laptop] Fertig: ${zipPath}`)
console.log(`[pack:laptop] Größe: ${sizeMb} MB (E-Mail-tauglich, solange unter dem Postfach-Limit)`)
console.log('[pack:laptop] Enthält personenbezogene Daten — nur an den Ziel-Laptop schicken.')
console.log('[pack:laptop] Am Ziel: UMZUG.md folgen. Nicht npm run setup.')
console.log('[pack:laptop] Produktiv (AssigmentMonitor) wurde nicht angefasst.')