var io = use('cellfs')

Object.defineProperty(Function.prototype, "hashify", {
  value: function () {
    var hash = {}
    var fn = this
    function hashified(...args) {
      var key = args[0]
      if (hash[key] == null) hash[key] = fn(...args)
      return hash[key]
    }
    return hashified
  },
})

// Merge of the old resources.js and packer.js functionalities
var Resources = {}

// Recognized resource extensions
Resources.scripts = ["js"]
Resources.images = ["qoi", "png", "gif", "jpg", "jpeg", "ase", "aseprite"]
Resources.sounds = ["wav", "flac", "mp3", "qoa"]
Resources.fonts = ["ttf"]

// Helper function: get extension from path in lowercase (e.g., "image.png" -> "png")
function getExtension(path) {
  var idx = path.lastIndexOf('.')
  if (idx < 0) return ''
  return path.substring(idx + 1).toLowerCase()
}

// Return true if ext is in at least one of the recognized lists
function isRecognizedExtension(ext) {
  if (!ext) return false
  if (Resources.scripts.includes(ext)) return true
  if (Resources.images.includes(ext)) return true
  if (Resources.sounds.includes(ext)) return true
  if (Resources.fonts.includes(ext)) return true
  if (Resources.lib.includes('.' + ext)) return true // for .so or .dll
  return false
}

function find_in_path(filename, exts = []) {
  if (typeof filename != 'string') return null
  
  if (filename.includes('.')) {
    var candidate = filename // possibly need "/" ?
    if (io.exists(candidate) && !io.is_directory(candidate)) return candidate
    return null
  }

  // Only check extensions if exts is provided and not empty
  if (exts.length > 0) {
    for (var ext of exts) {
      var candidate = filename + '.' + ext
      if (io.exists(candidate) && !io.is_directory(candidate)) return candidate
    }
  } else {
    // Fallback to extensionless file only if no extensions are specified
    var candidate = filename
    if (io.exists(candidate) && !io.is_directory(candidate)) return candidate
  }
  return null
}

// Return a canonical path (the real directory plus the path)
Resources.canonical = function(file) {
  return io.realdir(file) + file
}

// The resource finders
Resources.find_image = function(file) {
  return find_in_path(file, Resources.images)
}.hashify()

Resources.find_sound = function(file) {
  return find_in_path(file, Resources.sounds)
}.hashify()

Resources.find_script = function(file) {
  return find_in_path(file, Resources.scripts)
}.hashify()

Resources.find_font = function(file) {
  return find_in_path(file, Resources.fonts)
}.hashify()

// .prosperonignore reading helper
function read_ignore(dir) {
  var path = dir + '/.prosperonignore'
  var patterns = []
  if (io.exists(path)) {
    var lines = io.slurp(path).split('\n')
    for (var line of lines) {
      line = line.trim()
      if (!line || line.startsWith('#')) continue
      patterns.push(line)
    }
  }
  return patterns
}

// Return a list of recognized files in the directory (and subdirectories),
// skipping those matched by .prosperonignore. Directory paths are skipped.
Resources.getAllFiles = function(dir = "") {
  var patterns = read_ignore(dir)
  var all = io.globfs(patterns, dir)
  var results = []
  for (var f of all) {
    var fullPath = dir + '/' + f
    try {
      var st = io.stat(fullPath)
      // skip directories (filesize=0) or unrecognized extension
      if (!st.filesize) continue
      var ext = getExtension(f)
      if (!isRecognizedExtension(ext)) continue
      results.push(fullPath)
    } catch(e) {}
  }
  return results
}
Resources.getAllFiles[cell.DOC] = `
Return a list of recognized files in the given directory that are not matched by
.prosperonignore, skipping directories. Recognized extensions include scripts,
images, sounds, fonts, and libs.

:param dir: The directory to search.
:return: An array of recognized file paths.
`

// Categorize files by resource type
Resources.gatherStats = function(filePaths) {
  var stats = {
    scripts:0, images:0, sounds:0, fonts:0, lib:0, other:0, total:filePaths.length
  }
  for (var path of filePaths) {
    var ext = getExtension(path)
    if (Resources.scripts.includes(ext)) {
      stats.scripts++
      continue
    }
    if (Resources.images.includes(ext)) {
      stats.images++
      continue
    }
    if (Resources.sounds.includes(ext)) {
      stats.sounds++
      continue
    }
    if (Resources.fonts.includes(ext)) {
      stats.fonts++
      continue
    }
    stats.other++
  }
  return stats
}
Resources.gatherStats[cell.DOC] = `
Analyze a list of recognized files and categorize them by scripts, images, sounds,
fonts, libs, or other. Return a stats object with these counts and the total.

:param filePaths: An array of file paths to analyze.
:return: { scripts, images, sounds, fonts, lib, other, total }
`

return Resources