module Jarl
  #
  # Load config and application definitions
  #
  def self.load
    abort 'Docker is not installed' unless Docker.installed?
    if Jarl.jarl_files.empty?
      abort 'No *.jarl files found'
    elsif Jarl.applications.empty?
      abort 'No application definitions found'
    end
    true
  end

  #
  # Returns list of found *.jarl files
  #
  def self.jarl_files
    @jarl_files ||= load_jarl_files
  end

  # Returns list of registered applications
  #
  def self.applications
    @applications ||= jarl_files.map do |jf|
      begin
        jf.applications.map { |app_name, params| Application.new(jf.name, app_name, params) }
      rescue StandardError => e
        abort "Failed to parse application definition in file '#{jf.path}': #{e}"
      end
    end.flatten
  end

  # Returns list of applications matching the pattern
  #
  def self.find_applications_by(pattern)
    applications.select { |a| a.full_name.index(pattern) }
  end

  private

  def self.load_jarl_files
    Pathname.glob(Pathname.pwd + '**' + '*.jarl').map do |p|
      JarlFile.new(p)
    end
  end

end # module Jarl