require 'support/sample_app/config/application'
require 'support/sample_app/config/routes'


describe JsFromRoutes do
  ORIGINAL_TEMPLATE_PATH = JsFromRoutes.config.template_path

  let(:output_dir) { Pathname.new File.expand_path('../support/generated', __dir__) }
  let(:sample_dir) { Rails.root.join('app', 'javascript', 'requests') }
  let(:different_template_path) { File.expand_path('../support/jquery_template.js.erb', __dir__) }
  let(:controllers_with_exported_routes) { %w[Comments UserPreferences VideoClips] }

  def file_for(dir, name)
    dir.join("#{ name }Requests.js")
  end

  def sample_file_for(name)
    file_for(sample_dir, name)
  end

  def output_file_for(name)
    file_for(output_dir, name)
  end

  before do
    # Sanity checks
    expect(sample_dir.exist?).to eq true
    expect(Rails.application.routes.routes).to be_present

    # Remove directory from a previous test run.
    FileUtils.remove_dir(output_dir) rescue nil

    # Change the configuration to use a different directory.
    JsFromRoutes.config do |config|
      config.output_folder = output_dir
      config.template_path = ORIGINAL_TEMPLATE_PATH
    end
  end

  # NOTE: We do a manual snapshot test for now, more tests coming in the future.
  it 'should generate the files as expected' do
    expect(JsFromRoutes).to receive(:render_template).exactly(3).times.and_call_original
    JsFromRoutes.generate!

    # It does not generate routes that don't have `export: true`.
    expect(output_file_for('Welcome').exist?).to eq false

    # It generates one file per controller with exported routes.
    controllers_with_exported_routes.each do |file_name|
      expect(output_file_for(file_name).read).to eq sample_file_for(file_name).read
    end

    # It detects changes to the template, and regenerates the files.
    JsFromRoutes.config do |config|
      config.template_path = different_template_path
    end
    expect(JsFromRoutes).to receive(:render_template).exactly(3).times.and_call_original
    JsFromRoutes.generate!

    # These files should no longer match the sample ones.
    controllers_with_exported_routes.each do |file_name|
      expect(output_file_for(file_name).read).not_to eq sample_file_for(file_name).read
    end

    # It should not rewrite the files if the cache key has not changed.
    expect(JsFromRoutes).not_to receive(:render_template)
    JsFromRoutes.generate!
  end

  it 'should have a rake task available' do
    Rails.application.load_tasks
    expect(JsFromRoutes).to receive(:render_template).exactly(3).times
    expect { Rake::Task['js_from_routes:generate'].invoke }.not_to raise_error
  end
end