require 'testing_env'
require 'cmd/update'
require 'yaml'

class UpdaterTests < Homebrew::TestCase
  class UpdaterMock < ::Updater
    attr_accessor :diff

    def initialize(*)
      super
      @outputs = Hash.new { |h, k| h[k] = [] }
      @expected = []
      @called = []
    end

    def in_repo_expect(cmd, output = '')
      @expected << cmd
      @outputs[cmd] << output
    end

    def `(*args)
      cmd = args.join(" ")
      if @expected.include?(cmd) and !@outputs[cmd].empty?
        @called << cmd
        @outputs[cmd].shift
      else
        raise "#{inspect} unexpectedly called backticks: `#{cmd}`"
      end
    end
    alias_method :safe_system, :`

    def expectations_met?
      @expected == @called
    end

    def inspect
      "#<#{self.class.name}>"
    end
  end

  def fixture(name)
    self.class.fixture_data[name] || ""
  end

  def self.fixture_data
    @fixture_data ||= YAML.load_file("#{TEST_DIRECTORY}/fixtures/updater_fixture.yaml")
  end

  def setup
    @updater = UpdaterMock.new(HOMEBREW_REPOSITORY)
    @report = Report.new
  end

  def teardown
    FileUtils.rm_rf HOMEBREW_LIBRARY.join("Taps")
  end

  def perform_update(fixture_name="")
    @updater.diff = fixture(fixture_name)
    @updater.in_repo_expect("git checkout -q master")
    @updater.in_repo_expect("git rev-parse -q --verify HEAD", "1234abcd")
    @updater.in_repo_expect("git config core.autocrlf false")
    @updater.in_repo_expect("git pull -q origin refs/heads/master:refs/remotes/origin/master")
    @updater.in_repo_expect("git rev-parse -q --verify HEAD", "3456cdef")
    @updater.pull!
    @report.update(@updater.report)
    assert_predicate @updater, :expectations_met?
  end

  def test_update_homebrew_without_any_changes
    perform_update
    assert_empty @report
  end

  def test_update_homebrew_without_formulae_changes
    perform_update("update_git_diff_output_without_formulae_changes")
    assert_empty @report.select_formula(:M)
    assert_empty @report.select_formula(:A)
    assert_empty @report.select_formula(:D)
  end

  def test_update_homebrew_with_formulae_changes
    perform_update("update_git_diff_output_with_formulae_changes")
    assert_equal %w{ xar yajl }, @report.select_formula(:M)
    assert_equal %w{ antiword bash-completion ddrescue dict lua }, @report.select_formula(:A)
  end

  def test_update_homebrew_with_removed_formulae
    perform_update("update_git_diff_output_with_removed_formulae")
    assert_equal %w{libgsasl}, @report.select_formula(:D)
  end

  def test_update_homebrew_with_changed_filetype
    perform_update("update_git_diff_output_with_changed_filetype")
  end

  def test_update_homebrew_with_restructured_tap
    repo = HOMEBREW_LIBRARY.join("Taps", "foo", "bar")
    @updater = UpdaterMock.new(repo)
    repo.join("Formula").mkpath

    perform_update("update_git_diff_output_with_restructured_tap")

    assert_equal %w{foo/bar/git foo/bar/lua}, @report.select_formula(:A)
    assert_empty @report.select_formula(:D)
  end

  def test_update_homebrew_simulate_homebrew_php_restructuring
    repo = HOMEBREW_LIBRARY.join("Taps", "foo", "bar")
    @updater = UpdaterMock.new(repo)
    repo.join("Formula").mkpath

    perform_update("update_git_diff_simulate_homebrew_php_restructuring")

    assert_empty @report.select_formula(:A)
    assert_equal %w{foo/bar/git foo/bar/lua}, @report.select_formula(:D)
  end

  def test_update_homebrew_with_tap_formulae_changes
    repo = HOMEBREW_LIBRARY.join("Taps", "foo", "bar")
    @updater = UpdaterMock.new(repo)
    repo.join("Formula").mkpath

    perform_update("update_git_diff_output_with_tap_formulae_changes")

    assert_equal %w{foo/bar/lua}, @report.select_formula(:A)
    assert_equal %w{foo/bar/git}, @report.select_formula(:M)
    assert_empty @report.select_formula(:D)

    assert_empty @report.removed_tapped_formula
    assert_equal [repo.join("Formula", "lua.rb")],
      @report.new_tapped_formula
    assert_equal [repo.join("Formula", "git.rb")],
      @report.tapped_formula_for(:M)
  end
end