require 'spec_helper'
require 'fileutils'
require 'mixlib/shellout'
require 'appbundler/app'

describe Appbundler do

  def all_specs
    @all_specs ||= []
  end

  def double_spec(name, version, dep_names)
    deps = dep_names.map {|n| double("Bundler::Dependency #{n}", :name => n.to_s) }
    spec = double("Bundler::LazySpecification '#{name}'", :name => name.to_s, :version => version, :dependencies => deps)
    all_specs << spec
    spec
  end

  def shellout!(cmd)
    s = Mixlib::ShellOut.new(cmd, :env => {"RUBYOPT" => nil, "BUNDLE_GEMFILE" => nil,  "APPBUNDLER_ALLOW_RVM" => "true"})
    s.run_command
    s.error!
    s
  end

  let(:target_bindir) { File.expand_path("../../test-tmp/bin", __FILE__) }

  context "given an app with multiple levels of dependencies" do

    let!(:second_level_dep_a_a) do
      double_spec(:second_level_dep_a_a, "2.1.0", [])
    end

    let!(:second_level_dep_shared) do
      double_spec(:second_level_dep_shared, "2.3.0", [])
    end

    let!(:second_level_dep_b_a) do
      double_spec(:second_level_dep_b_a, "2.2.0", [])
    end

    let!(:first_level_dep_a) do
      double_spec(:first_level_dep_a, "1.1.0", [:second_level_dep_a_a, :second_level_dep_shared])
    end

    let!(:first_level_dep_b) do
      double_spec(:first_level_dep_b, "1.2.0", [:second_level_dep_b_a, :second_level_dep_shared])
    end

    let!(:app_spec) do
      double_spec(:app, "1.0.0", [:first_level_dep_a, :first_level_dep_b])
    end

    let(:app_root) { "/opt/app/embedded/apps/app" }

    let(:app) do
      Appbundler::App.new(app_root, target_bindir)
    end

    before do
      app.stub(:gemfile_lock_specs).and_return(all_specs)
    end

    it "finds all runtime dependencies of the app" do
      # we want to find the minimum set of gems that we need to activate to run
      # the application. To do this, we look at the app's runtime deps and
      # recursively search through the list of gemspecs that we got from the
      # Gemfile.lock, collecting all the runtime deps. This should get us the
      # smallest possible "activate.rb" file that can launch the application
      # with locked gem versions.
      expect(app.runtime_dep_specs).to include(first_level_dep_a)
      expect(app.runtime_dep_specs).to include(first_level_dep_b)
      expect(app.runtime_dep_specs).to include(second_level_dep_a_a)
      expect(app.runtime_dep_specs).to include(second_level_dep_b_a)
      expect(app.runtime_dep_specs).to include(second_level_dep_shared)
      expect(app.runtime_dep_specs.select {|s| s == second_level_dep_shared}).to have(1).item
    end

    it "generates gem activation code for the app" do
      # this is code with a bunch of gem "foo", "= X.Y.Z" statements. The top
      # level application is _not_ included in this, it's added to the load
      # path instead.
      expect(app.runtime_activate).to include(%q{gem "first_level_dep_a", "= 1.1.0"})
      expect(app.runtime_activate).to include(%q{gem "second_level_dep_a_a", "= 2.1.0"})
      expect(app.runtime_activate).to include(%q{gem "second_level_dep_shared", "= 2.3.0"})
      expect(app.runtime_activate).to include(%q{gem "first_level_dep_b", "= 1.2.0"})
      expect(app.runtime_activate).to include(%q{gem "second_level_dep_b_a", "= 2.2.0"})
      expect(app.runtime_activate).to_not include(%q{gem "app"})
    end

    it "adds the app code to the load path" do
      expect(app.runtime_activate).to include('$:.unshift "/opt/app/embedded/apps/app/lib"')
    end

    it "generates code to override GEM_HOME and GEM_PATH (e.g., rvm)" do
      expected = %Q{ENV["GEM_HOME"] = ENV["GEM_PATH"] = nil unless ENV["APPBUNDLER_ALLOW_RVM"] == "true"}
      expect(app.env_sanitizer).to eq(expected)
      expect(app.runtime_activate).to include(expected)
    end

  end

  context "when created with the example application" do
    FIXTURES_PATH =  File.expand_path("../../fixtures/", __FILE__).freeze

    APP_ROOT = File.join(FIXTURES_PATH, "example-app").freeze

    let(:app_root) { APP_ROOT }

    let(:app) do
      Appbundler::App.new(APP_ROOT, target_bindir)
    end

    before(:all) do
      Dir.chdir(APP_ROOT) do
        shellout!("bundle install")
      end
    end

    before do
      FileUtils.rm_rf(target_bindir) if File.exist?(target_bindir)
      FileUtils.mkdir_p(target_bindir)
    end

    after(:all) do
      FileUtils.rm_rf(target_bindir) if File.exist?(target_bindir)
    end

    it "initializes ok" do
      app
    end

    it "names the app using the directory basename" do
      app.name.should == "example-app"
    end

    it "lists the app's dependencies" do
      # only runtime deps
      expect(app.app_dependency_names).to eq(["chef"])
    end

    it "generates runtime activation code for the app" do
      expected_gem_activates=<<-E
ENV["GEM_HOME"] = ENV["GEM_PATH"] = nil unless ENV["APPBUNDLER_ALLOW_RVM"] == "true"
gem "chef", "= 11.10.4"
gem "chef-zero", "= 1.7.3"
gem "hashie", "= 2.0.5"
gem "json", "= 1.8.1"
gem "mixlib-log", "= 1.6.0"
gem "moneta", "= 0.6.0"
gem "rack", "= 1.5.2"
gem "diff-lcs", "= 1.2.5"
gem "erubis", "= 2.7.0"
gem "highline", "= 1.6.20"
gem "mime-types", "= 1.25.1"
gem "mixlib-authentication", "= 1.3.0"
gem "mixlib-cli", "= 1.4.0"
gem "mixlib-config", "= 2.1.0"
gem "mixlib-shellout", "= 1.3.0"
gem "net-ssh", "= 2.8.0"
gem "net-ssh-multi", "= 1.2.0"
gem "net-ssh-gateway", "= 1.2.0"
gem "ohai", "= 6.20.0"
gem "ipaddress", "= 0.8.0"
gem "systemu", "= 2.5.2"
gem "yajl-ruby", "= 1.2.0"
gem "pry", "= 0.9.12.6"
gem "coderay", "= 1.1.0"
gem "method_source", "= 0.8.2"
gem "slop", "= 3.4.7"
gem "puma", "= 1.6.3"
gem "rest-client", "= 1.6.7"
E
      expect(app.runtime_activate).to include(expected_gem_activates)
      expected_load_path =  '$:.unshift "' + File.join(app_root, "lib") + '"'
      expect(app.runtime_activate).to include(expected_load_path)
    end

    it "lists the app's executables" do
      expected_executables = %w[app-binary-1 app-binary-2].map do |basename|
        File.join(app_root, "/bin", basename)
      end
      expect(app.executables).to match_array(expected_executables)
    end

    it "generates an executable 'stub' for an executable in the app" do
      app_binary_1_path = app.executables.grep(/app\-binary\-1/).first
      executable_content = app.binstub(app_binary_1_path)

      shebang = executable_content.lines.first
      expect(shebang).to match(/^\#\!/)
      expect(shebang).to include(Gem.ruby)

      expect(executable_content).to include(app.runtime_activate)

      load_binary = executable_content.lines.to_a.last
      expect(load_binary).to eq(%Q[Kernel.load '#{app_binary_1_path}'\n])
    end

    it "generates executable stubs for all executables in the app" do
      app.write_executable_stubs
      binary_1 = File.join(target_bindir, "app-binary-1")
      binary_2 = File.join(target_bindir, "app-binary-2")
      expect(File.exist?(binary_1)).to be_true
      expect(File.exist?(binary_2)).to be_true
      expect(File.executable?(binary_1)).to be_true
      expect(File.executable?(binary_1)).to be_true
      expect(shellout!(binary_1).stdout).to eq("binary 1 ran\n")
      expect(shellout!(binary_2).stdout).to eq("binary 2 ran\n")
    end

  end

end