class CompassTest

def assert_no_errors(css_file, project_name)
  file = css_file[(tempfile_path(project_name).size+1)..-1]
  msg = "Syntax Error found in #{file}. Results saved into #{save_path(project_name)}/#{file}"
  assert_equal 0, open(css_file).readlines.grep(/Sass::SyntaxError/).size, msg
end

def assert_renders_correctly(*arguments)
  options = arguments.last.is_a?(Hash) ? arguments.pop : {}
  for name in arguments
    actual_result_file = "#{tempfile_path(@current_project)}/#{name}.css"
    expected_result_file = "#{result_path(@current_project)}/#{name}.css"
    actual_lines = File.read(actual_result_file).split("\n")
    expected_lines = ERB.new(File.read(expected_result_file)).result(binding).split("\n")
    expected_lines.zip(actual_lines).each_with_index do |pair, line|
      message = "template: #{name}\nline:     #{line + 1}"
      assert_equal(pair.first, pair.last, message)
    end
    if expected_lines.size < actual_lines.size
      assert(false, "#{actual_lines.size - expected_lines.size} Trailing lines found in #{actual_result_file}.css: #{actual_lines[expected_lines.size..-1].join('\n')}")
    end
  end
end

def configuration_file(project_name)
  File.join(project_path(project_name), "config.rb")
end

def each_css_file(dir)
  Dir.glob("#{dir}/**/*.css").each do |css_file|
    yield css_file
  end
end

def project_path(project_name)
  absolutize("fixtures/stylesheets/#{project_name}")
end

def result_path(project_name)
  File.join(project_path(project_name), "css")
end

def save_output(dir)
  FileUtils.rm_rf(save_path(dir))
  FileUtils.cp_r(tempfile_path(dir), save_path(dir)) if File.exists?(tempfile_path(dir))
end

def save_path(project_name)
  File.join(project_path(project_name), "saved")
end

def setup
  Compass.reset_configuration!
end

def teardown
  teardown_fixtures :blueprint, :empty, :compass, :image_urls, :relative
end

def teardown_fixtures(*project_names)
  project_names.each do |project_name|
    FileUtils.rm_rf tempfile_path(project_name)
  end
end

def tempfile_path(project_name)
  File.join(project_path(project_name), "tmp")
end

def template_path(project_name)
  File.join(project_path(project_name), "sass")
end

def test_blueprint
  within_project(:blueprint) do |proj|
    each_css_file(proj.css_path) do |css_file|
      assert_no_errors css_file, :blueprint
    end
    assert_renders_correctly :typography
  end
end

def test_compass
  within_project('compass') do |proj|
    each_css_file(proj.css_path) do |css_file|
      assert_no_errors css_file, 'compass'
    end
    assert_renders_correctly :reset, :layout, :utilities
  end
end

def test_empty_project
  # With no sass files, we should have no css files.
  within_project(:empty) do |proj|
    return unless proj.css_path && File.exists?(proj.css_path)
    Dir.new(proj.css_path).each do |f|
      fail "This file should not have been generated: #{f}" unless f == "." || f == ".."
    end
  end
end

def test_image_urls
  within_project('image_urls') do |proj|
    each_css_file(proj.css_path) do |css_file|
      assert_no_errors css_file, 'image_urls'
    end
    assert_renders_correctly :screen
  end
end

def test_image_urls
  within_project('relative') do |proj|
    each_css_file(proj.css_path) do |css_file|
      assert_no_errors css_file, 'relative'
    end
    assert_renders_correctly :screen
  end
end

def within_project(project_name)
  @current_project = project_name
  Compass.add_configuration(configuration_file(project_name)) if File.exists?(configuration_file(project_name))
  Compass.configuration.project_path = project_path(project_name)
  Compass.configuration.environment = :production
  args = Compass.configuration.to_compiler_arguments(:logger => Compass::NullLogger.new)
  if Compass.configuration.sass_path && File.exists?(Compass.configuration.sass_path)
    compiler = Compass::Compiler.new *args
    compiler.run
  end
  yield Compass.configuration
rescue
  save_output(project_name)    
  raise
end