version: 2.1

executors:
  default:
    working_directory: ~/aws-terraform
    docker:
      - image: hashicorp/terraform:light

commands:
  install_tfnotify:
    steps:
      - run:
          name: install tfnotify
          command: |
            apk --update add go libc-dev
            go get -u -v github.com/mercari/tfnotify

jobs:
  plan:
    executor:
      name: default
    steps:
      - checkout
      - install_tfnotify
      - run:
          name: Init terraform
          command: terraform init
      - run:
          name: Validate terraform
          command: terraform validate
      - run:
          name: Plan terraform
          command: terraform plan | /root/go/bin/tfnotify plan

  deploy:
    executor:
      name: default
    steps:
      - checkout
      - install_tfnotify
      - run:
          name: Init terraform
          command: terraform init
      - run:
          name: Apply terraform
          command: terraform apply -auto-approve | /root/go/bin/tfnotify apply

  destroy:
    executor:
      name: default
    steps:
      - checkout
      - install_tfnotify
      - run:
          name: Init terraform
          command: terraform init
      - run:
          name: destroy terraform
          command: terraform destroy -auto-approve

workflows:
  version: 2
  plan-and-deploy:
    jobs:
      - plan
      - hold:
          type: approval
          requires:
            - plan
          filters:
            branches:
              only: master
      - deploy:
          requires:
            - plan
          filters:
            branches:
              only: master
      - destroy:
          requires:
            - deploy
          filters:
            branches:
              only: master