require 'spec_helper'

describe Stackster do


  describe "with a single running instance" do
    before do
      @instances = [
                     { 'instancesSet' => 
                       [
                         { 'tagSet' => 
                           { 'aws:cloudformation:stack-name' => 'my-stack' },
                           'instanceState' =>
                           { 'name' => 'running' }
                         }
                       ]
                     },
                     { 'instancesSet' =>
                       [
                         { 'tagSet' =>
                           { 'aws:cloudformation:stack-name' => 'my-stack' },
                           'instanceState' =>
                           { 'name' => 'terminated' }
                         }
                       ]
                     },
                     { 'instancesSet' =>
                       [
                         { 'tagSet' =>
                           { 'aws:cloudformation:stack-name' => 'dead-stack' },
                           'instanceState' =>
                           { 'name' => 'terminated' }
                         }
                       ]
                     }
                   ]
    end

    it "should list running instance within the given stack" do
      @ec2_mock = mock 'simple ec2'
      config = Stackster::Config.new(:config => { 'access_key' => 'the-key',
                                                  'secret_key' => 'secret',
                                                  'region'     => 'us-west-1' })
      Stackster::AWS::EC2.should_receive(:new).
                          with(:config => config).
                          and_return @ec2_mock
      instance_reader = Stackster::InstanceReader.new :config => config
      @ec2_mock.should_receive(:describe_instances).
                and_return(@instances)
      instance_reader.list_stack_instances('my-stack').count.
                      should == 1
    end

    it "should not include instances which are in different stacks" do
      @ec2_mock = mock 'simple ec2'
      config = Stackster::Config.new(:config => { 'access_key' => 'the-key',
                                                  'secret_key' => 'secret',
                                                  'region'     => 'us-west-1' })
      Stackster::AWS::EC2.should_receive(:new).
                          with(:config => config).
                          and_return @ec2_mock
      instance_reader = Stackster::InstanceReader.new :config => config
      @ec2_mock.should_receive(:describe_instances).
                and_return(@instances)
      instance_reader.list_stack_instances('another-stack').count.
                      should == 0
    end

    it "should not include instances which are not running" do
      @ec2_mock = mock 'simple ec2'
      config = Stackster::Config.new(:config => { 'access_key' => 'the-key',
                                                  'secret_key' => 'secret',
                                                  'region'     => 'us-west-1' })
      Stackster::AWS::EC2.should_receive(:new).
                          with(:config => config).
                          and_return @ec2_mock
      instance_reader = Stackster::InstanceReader.new :config => config
      @ec2_mock.should_receive(:describe_instances).
                and_return(@instances)
      instance_reader.list_stack_instances('dead-stack').count.
                      should == 0
    end
  end
end