require 'spec_helper'

describe Omnibus::GitFetcher do
  let(:shell_out) do
    shell_out = double('Mixlib::ShellOut')
    stub_const('Mixlib::ShellOut', shell_out)
    shell_out
  end
  let(:software) do
    double('software').tap do |s|
      s.stub name: 'project',
             source: { git: 'git@example.com:test/project.git' },
             version: '0.0.1',
             project_dir: '/tmp/project'
    end
  end

  def expect_git_clone_and_ls_remote
    expect_git_clone
    expect_git_ls_remote
  end

  def expect_git_clone
    double('git_clone').tap do |g|
      expect(shell_out).to receive(:new)
        .with('git clone git@example.com:test/project.git /tmp/project', live_stream: STDOUT)
        .ordered
        .and_return(g)
      expect(g).to receive(:run_command).ordered
      expect(g).to receive(:error!).ordered
    end
  end

  def expect_git_ls_remote
    double('git_ls_remote').tap do |g|
      expect(shell_out).to receive(:new)
        .with('git ls-remote origin 0.0.1*', live_stream: STDOUT, cwd: '/tmp/project')
        .ordered
        .and_return(g)
      expect(g).to receive(:run_command).ordered
      expect(g).to receive(:error!).ordered
      g.stub(stdout: git_ls_remote_out)
    end
  end

  describe '#fetch' do
    context 'when the project is not cloned yet' do
      before do
        File.stub(:exist?).with('/tmp/project/.git').and_return(false)
      end

      context 'when the source repository is accessible' do
        subject do
          Omnibus::GitFetcher.new software
        end

        context 'when the ref exists' do
          let(:git_ls_remote_out) do
            'a2ed66c01f42514bcab77fd628149eccb4ecee28	refs/tags/0.0.1'
          end

          it 'should clone the Git repository and then check out the commit' do
            1.times { expect_git_clone_and_ls_remote }
            double('git_checkout').tap do |g|
              expect(shell_out).to receive(:new)
                .with('git checkout a2ed66c01f42514bcab77fd628149eccb4ecee28', live_stream: STDOUT, cwd: '/tmp/project')
                .ordered
                .and_return(g)
              expect(g).to receive(:run_command).ordered
              expect(g).to receive(:error!).ordered
            end

            expect { subject.fetch }.to_not raise_error
          end
        end

        context 'when the ref does not exist' do
          let(:git_ls_remote_out) { '' }
          let(:error_reporter) { double('ErrorReporter', explain: nil) }

          before { Omnibus::Fetcher::ErrorReporter.stub(:new).and_return(error_reporter) }

          it 'should clone the Git repository and then fail while retrying 3 times' do
            expect(error_reporter).to receive(:explain)
              .with(%(Failed to fetch git repository 'git@example.com:test/project.git'))

            4.times do
              expect_git_clone
            end

            expect_git_ls_remote

            expect(subject).to receive(:log).with(/git ls\-remote failed/).at_least(1).times
            expect(subject).to receive(:log).with(/git clone\/fetch failed/).at_least(1).times
            # Prevent sleeping to run the spec fast
            subject.stub(:sleep)
            expect { subject.fetch }.to raise_error(Omnibus::UnresolvableGitReference)
          end
        end
      end
    end
  end
end