class KPM::Utils

def get_plugin_name_from_file_path(file_path)
  base = File.basename(file_path).to_s
  ver = get_version_from_file_path(file_path)
  ext = File.extname(base)
  name = base.gsub(ext, '')
  if ver.nil?
    # this will remove SNAPSHOT and any dash that appear before it (ex --SNAPSHOT).
    name = name.gsub(/((-+){,1}SNAPSHOT){,1}/, '')
    last_dash = name.rindex('-')
    name = name[0..last_dash] unless last_dash.nil?
  else
    name = name.gsub(ver, '')
  end
  name = name[0..name.length - 2] if name[-1].match(/[a-zA-z]/).nil?
  name
end

def get_version_from_file_path(file_path)
  base = File.basename(file_path).to_s
  ver = base.match(/(\d+)(\.(\d+)){,6}((-+){,1}SNAPSHOT){,1}/)
  return ver if ver.nil?
  ver[0]
end

def path_with_skipped_top_level_dir(path)
  Pathname(path).each_filename.to_a[1..-1].join(File::SEPARATOR)
end

def peek_tgz_file_names(tar_gz_archive)
  file_names = []
  Gem::Package::TarReader.new(Zlib::GzipReader.open(tar_gz_archive)) do |tar|
    tar.each do |entry|
      file_names.push entry.full_name if entry.file?
    end
  end
  file_names
end

def unpack_tgz(tar_gz_archive, destination, skip_top_dir = false)
  top_dir = nil
  Gem::Package::TarReader.new(Zlib::GzipReader.open(tar_gz_archive)) do |tar|
    dest = nil
    tar.each do |entry|
      if entry.full_name == TAR_LONGLINK
        dest = File.join destination, skip_top_dir ? path_with_skipped_top_level_dir(entry.read.strip) : entry.read.strip
        next
      end
      dest ||= File.join destination, skip_top_dir ? path_with_skipped_top_level_dir(entry.full_name) : entry.full_name
      if entry.directory?
        File.delete dest if File.file? dest
        FileUtils.mkdir_p dest, mode: entry.header.mode, verbose: false
      elsif entry.file?
        FileUtils.rm_rf dest if File.directory? dest
        FileUtils.mkdir_p File.dirname(dest), verbose: false
        File.open dest, 'wb' do |f|
          f.print entry.read
        end
        FileUtils.chmod entry.header.mode, dest, verbose: false
        current_dir = File.dirname(dest)
        # In case there are two top dirs, keep the last one by convention
        top_dir = current_dir if top_dir.nil? || top_dir.size >= current_dir.size
      elsif entry.header.typeflag == '2' # Symlink
        File.symlink entry.header.linkname, dest
      end
      dest = nil
    end
  end
  top_dir
end