require 'spec_helper'
require 'json'

describe Stackster do

  before do
    @template_body = '{ "Parameters": 
                        { 
                          "param1" : 
                            {
                              "Description" : "param-1"
                            },
                          "param2" : 
                            {
                              "Description" : "param-2"
                            }
                        }
                      }'
  end

  it "should update the stack when parameters change" do
    attributes = { "param1" => "value1", "param3" => "value3" }
    config_mock = mock 'config mock'
    logger_mock = mock 'logger mock'
    entry_mock = mock 'entry mock'
    cloud_formation_mock = mock 'cloud formation mock'
    Stackster::AWS::CloudFormation.should_receive(:new).
                                   with(:config => config_mock).
                                   and_return cloud_formation_mock
    entry_mock.should_receive(:attributes).and_return attributes
    cloud_formation_mock.should_receive(:update).
                         with(:name      => 'test-stack', 
                              :parameters => { 'param1' => 'value1' },
                              :template   => @template_body).
                         and_return true
    config_mock.should_receive(:logger).and_return(logger_mock)
    logger_mock.should_receive(:info).exactly(2).times
    stack_updater = Stackster::StackUpdater.new :name          => 'test-stack',
                                                :template_body => @template_body,
                                                :entry         => entry_mock,
                                                :config        => config_mock

    stack_updater.update_stack_if_parameters_changed( [ { 'param1' => 'new-value' } ] ).
                  should == true
  end

  it "should not update the stack when parameters don't change" do
    attributes = { "param3" => "value3" }
    config_mock = mock 'config mock'
    logger_mock = mock 'logger mock'
    entry_mock = mock 'entry mock'
    Stackster::AWS::CloudFormation.should_receive(:new).exactly(0).times
    config_mock.should_receive(:logger).and_return(logger_mock)
    logger_mock.should_receive(:info).with("No Cloud Formation parameters require updating.")
    stack_updater = Stackster::StackUpdater.new :name          => 'test-stack',
                                                :template_body => @template_body,
                                                :entry         => entry_mock,
                                                :config        => config_mock

    stack_updater.update_stack_if_parameters_changed( [ { 'another-param' => 'new-value' } ] ).
                  should == false
  end

end