require 'rails_helper'

describe ExecutionEnvironmentsController do
  let(:execution_environment) { FactoryGirl.create(:ruby) }
  let(:user) { FactoryGirl.create(:admin) }
  before(:each) { allow(controller).to receive(:current_user).and_return(user) }

  describe 'POST #create' do
    before(:each) { expect(DockerClient).to receive(:image_tags).at_least(:once).and_return([]) }

    context 'with a valid execution environment' do
      let(:request) { Proc.new { post :create, execution_environment: FactoryGirl.attributes_for(:ruby) } }
      before(:each) { request.call }

      expect_assigns(docker_images: Array)
      expect_assigns(execution_environment: ExecutionEnvironment)

      it 'creates the execution environment' do
        expect { request.call }.to change(ExecutionEnvironment, :count).by(1)
      end

      expect_redirect
    end

    context 'with an invalid execution environment' do
      before(:each) { post :create, execution_environment: {} }

      expect_assigns(execution_environment: ExecutionEnvironment)
      expect_status(200)
      expect_template(:new)
    end
  end

  describe 'DELETE #destroy' do
    before(:each) { delete :destroy, id: execution_environment.id }

    expect_assigns(execution_environment: :execution_environment)

    it 'destroys the execution environment' do
      execution_environment = FactoryGirl.create(:ruby)
      expect { delete :destroy, id: execution_environment.id }.to change(ExecutionEnvironment, :count).by(-1)
    end

    expect_redirect(:execution_environments)
  end

  describe 'GET #edit' do
    before(:each) do
      expect(DockerClient).to receive(:image_tags).at_least(:once).and_return([])
      get :edit, id: execution_environment.id
    end

    expect_assigns(docker_images: Array)
    expect_assigns(execution_environment: :execution_environment)
    expect_status(200)
    expect_template(:edit)
  end

  describe 'POST #execute_command' do
    let(:command) { 'which ruby' }

    before(:each) do
      expect(DockerClient).to receive(:new).with(execution_environment: execution_environment, user: user).and_call_original
      expect_any_instance_of(DockerClient).to receive(:execute_command).with(command)
      post :execute_command, command: command, id: execution_environment.id
    end

    expect_assigns(docker_client: DockerClient)
    expect_assigns(execution_environment: :execution_environment)
    expect_content_type('application/json')
    expect_status(200)
  end

  describe 'GET #index' do
    let!(:execution_environments) { FactoryGirl.create_pair(:ruby) }
    before(:each) { get :index }

    expect_assigns(execution_environments: ExecutionEnvironment.all)
    expect_status(200)
    expect_template(:index)
  end

  describe 'GET #new' do
    before(:each) do
      expect(DockerClient).to receive(:image_tags).at_least(:once).and_return([])
      get :new
    end

    expect_assigns(docker_images: Array)
    expect_assigns(execution_environment: ExecutionEnvironment)
    expect_status(200)
    expect_template(:new)
  end

  describe '#set_docker_images', docker: true do
    context 'when Docker is unavailable' do
      let(:error_message) { 'Docker is unavailable' }

      before(:each) do
        expect(DockerClient).to receive(:check_availability!).at_least(:once).and_raise(DockerClient::Error.new(error_message))
        controller.send(:set_docker_images)
      end

      it 'fails gracefully' do
        expect { controller.send(:set_docker_images) }.not_to raise_error
      end

      expect_assigns(docker_images: Array)

      it 'displays a flash message' do
        expect(flash[:warning]).to eq(error_message)
      end
    end
  end

  describe 'GET #shell' do
    before(:each) { get :shell, id: execution_environment.id }

    expect_assigns(execution_environment: :execution_environment)
    expect_status(200)
    expect_template(:shell)
  end

  describe 'GET #show' do
    before(:each) { get :show, id: execution_environment.id }

    expect_assigns(execution_environment: :execution_environment)
    expect_status(200)
    expect_template(:show)
  end

  describe 'PUT #update' do
    context 'with a valid execution environment' do
      before(:each) do
        expect(DockerClient).to receive(:image_tags).at_least(:once).and_return([])
        put :update, execution_environment: FactoryGirl.attributes_for(:ruby), id: execution_environment.id
      end

      expect_assigns(docker_images: Array)
      expect_assigns(execution_environment: ExecutionEnvironment)
      expect_redirect
    end

    context 'with an invalid execution environment' do
      before(:each) { put :update, execution_environment: {name: ''}, id: execution_environment.id }

      expect_assigns(execution_environment: ExecutionEnvironment)
      expect_status(200)
      expect_template(:edit)
    end
  end
end