// AKAI Utils — shared utility functions

function esc(s) {
  if (!s) return ''
  return s.replace(/&/g, '&amp;').replace(/</g, '&lt;')
          .replace(/>/g, '&gt;').replace(/"/g, '&quot;').replace(/'/g, '&#39;')
}

function sanitize(s) {
  return s.replace(/[^a-zA-Z0-9_-]/g, '_')
}

function formatBytes(bytes) {
  if (bytes === 0) return '0 B'
  const k = 1024
  const sizes = ['B', 'KB', 'MB', 'GB']
  const i = Math.floor(Math.log(bytes) / Math.log(k))
  return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i]
}

function formatTime(secs) {
  const m = Math.floor(secs / 60)
  const s = Math.floor(secs % 60)
  return m + ':' + s.toString().padStart(2, '0')
}

function groupWavs(paths) {
  const libs = {}
  for (const p of paths) {
    const parts = p.split('/')
    let lib, prog, file
    if (parts.length === 1) {
      lib = ''; prog = parts[0]; file = parts[0]
    } else if (parts.length === 2) {
      lib = parts[0]; prog = parts[0]; file = parts[1]
    } else {
      lib = parts[0]; prog = parts[1]; file = parts[parts.length - 1]
    }
    if (!libs[lib]) libs[lib] = {}
    if (!libs[lib][prog]) libs[lib][prog] = []
    libs[lib][prog].push({ fullPath: p, name: file.replace(/\.wav$/i, '') })
  }
  return libs
}

function cleanName(name) {
  return name.replace(/_+/g, ' ').trim()
}

if (typeof module !== 'undefined' && module.exports) {
  module.exports = { esc, sanitize, formatBytes, formatTime, groupWavs, cleanName }
}