abort if ARGV.include? "--skip-update"

require 'testing_env'

require 'extend/ARGV' # needs to be after test/unit to avoid conflict with OptionsParser
ARGV.extend(HomebrewArgvExtension)

require 'formula'
require 'utils'
require 'update'

class RefreshBrewMock < RefreshBrew
  def in_prefix_expect(expect, returns = '')
    @expect ||= {}
    @expect[expect] = returns
  end
  
  def `(cmd)
    if Dir.pwd == HOMEBREW_PREFIX.to_s and @expect.has_key?(cmd)
      (@called ||= []) << cmd
      @expect[cmd]
    else
      raise "#{inspect} Unexpectedly called backticks in pwd `#{HOMEBREW_PREFIX}' and command `#{cmd}'"
    end
  end

  alias safe_system `
  
  def expectations_met?
    @expect.keys.sort == @called.sort
  end
  
  def inspect
    "#<#{self.class.name} #{object_id}>"
  end
end

class UpdaterTests < Test::Unit::TestCase
  OUTSIDE_PREFIX = '/tmp'
  def outside_prefix
    Dir.chdir(OUTSIDE_PREFIX) { yield }
  end
  
  def fixture(name)
    self.class.fixture_data[name]
  end
  
  def self.fixture_data
    unless @fixture_data
      require 'yaml'
      @fixture_data = YAML.load_file(Pathname.new(ABS__FILE__).parent.realpath + 'fixtures/updater_fixture.yaml')
    end
    @fixture_data
  end

  def test_update_homebrew_without_any_changes
    outside_prefix do
      updater = RefreshBrewMock.new
      updater.in_prefix_expect(RefreshBrew::INIT_COMMAND)
      updater.in_prefix_expect(RefreshBrew::UPDATE_COMMAND, "Already up-to-date.\n")
      
      assert_equal false, updater.update_from_masterbrew!
      assert updater.expectations_met?
      assert updater.updated_formulae.empty?
      assert updater.added_formulae.empty?
    end
  end
  
  def test_update_homebrew_without_formulae_changes
    outside_prefix do
      updater = RefreshBrewMock.new
      updater.in_prefix_expect(RefreshBrew::INIT_COMMAND)
      output = fixture('update_git_pull_output_without_formulae_changes')
      updater.in_prefix_expect(RefreshBrew::UPDATE_COMMAND, output)
      
      assert_equal true, updater.update_from_masterbrew!
      assert !updater.pending_formulae_changes?
      assert updater.updated_formulae.empty?
      assert updater.added_formulae.empty?
    end
  end
  
  def test_update_homebrew_with_formulae_changes
    outside_prefix do
      updater = RefreshBrewMock.new
      updater.in_prefix_expect(RefreshBrew::INIT_COMMAND)
      output = fixture('update_git_pull_output_with_formulae_changes')
      updater.in_prefix_expect(RefreshBrew::UPDATE_COMMAND, output)
      
      assert_equal true, updater.update_from_masterbrew!
      assert updater.pending_formulae_changes?
      assert_equal %w{ xar yajl }, updater.updated_formulae
      assert_equal %w{ antiword bash-completion ddrescue dict lua }, updater.added_formulae
    end
  end
  
  def test_updater_returns_current_revision
    outside_prefix do
      updater = RefreshBrewMock.new
      updater.in_prefix_expect(RefreshBrew::REVISION_COMMAND, 'the-revision-hash')
      assert_equal 'the-revision-hash', updater.current_revision
    end
  end
end