class Tasks::Toolbelt::Build::Tarball < Tasks::Toolbelt
    
  around_ensure :cleanup
    
  def call
    # checkout requested revision
    checkout_revision
    # clean directories
    clean
    # copy files into release
    copy_files_into_release
    add_quandl_executable
    # add revision when given
    append_revision_to_release_version unless git_branch == 'master'
    # vendorize the bundle 
    copy_vendored_gems
    # build tar
    package_release_into_tar
  end
  
  protected
  
  def add_quandl_executable
    resource_path = options.platform.present? ? "#{options.platform}/quandl" : "pkg/quandl"
    mkdir_p("#{release_path}/pkg") unless Dir.exists?("#{release_path}/pkg")
    cp resource(resource_path), "#{release_path}/pkg/quandl"
  end
  
  def checkout_revision
    raise "You have unstaged commits." if %x{git status} =~ /Changes not staged for commit/
    sh "git checkout #{options.revision}"
    raise "Unable to checkout #{options.revision}" unless %x{git branch | grep '*'} =~ /#{options.revision}/
  end
  
  def copy_files_into_release
    # for each path
    ['lib', 'bin', 'config', 'VERSION'].each do |path|
      # recursively copy into release
      cp_r File.join( root_path, path ), File.join( release_path, path )
    end
  end
  
  def clean
    rm_rf tarball_path
    # create release
    mkdir_p release_path
  end
  
  def append_revision_to_release_version
    version_file = File.join( release_path, 'VERSION')
    IO.write(version_file, File.open(version_file) do |f|
      f.read.gsub(version, "#{version} #{prerelease_information}")
    end
    )
  end

  def copy_vendored_gems
    Bundler.with_clean_env do
      sh( "bundle install --without development test --path #{release_path}/vendor" )
      mv File.join(release_path, "vendor/ruby/1.9.1/gems"), File.join(release_path, "vendor")
      rm_rf File.join(release_path, "vendor/ruby")
    end
  end

  def package_release_into_tar
    # path to tarball
    tarball_filename = File.basename([ release_path, revision, 'tar.gz' ].compact.join("."))
    # enter tarball build directory
    Dir.chdir(tarball_path) do
      # create targz
      Tar.pack( 'quandl-command', File.join(tarball_path, tarball_filename) )
    end
  end
  
  def cleanup
    rm_rf File.join( root_path, '.bundle')
  end

end