resource_types:
- name: git-branches
  type: registry-image
  source:
    repository: aoldershaw/git-branches-resource

- name: terraform
  type: registry-image
  source:
    repository: ljfranklin/terraform-resource

resources:
- name: feature-branches
  type: git-branches
  source:
    uri: https://github.com/concourse/examples
    # The "(?P<name>pattern)" syntax defines a named capture group.
    # aoldershaw/git-branches-resource emits the value of each named capture
    # group under the `groups` key.
    #
    # e.g. feature/some-feature ==> {"groups": {"feature": "some-feature"}}
    branch_regex: 'feature/(?P<feature>.*)'

- name: examples
  type: git
  source:
    uri: https://github.com/concourse/examples

- name: staging-env
  type: terraform
  source:
    backend_type: gcs
    backend_config: &terraform_backend_config
      bucket: concourse-examples
      prefix: multi-branch/terraform
      credentials: ((gcp_service_account_key))

jobs:
- name: set-feature-pipelines
  plan:
  - in_parallel:
    - get: feature-branches
      trigger: true
    - get: examples
  - load_var: branches
    file: feature-branches/branches.json
  - across:
    - var: branch
      values: ((.:branches))
    set_pipeline: dev
    file: examples/pipelines/multi-branch/template.yml
    instance_vars: {feature: ((.:branch.groups.feature))}
    vars: {branch: ((.:branch.name))}

- name: cleanup-inactive-workspaces
  plan:
  - in_parallel:
    - get: feature-branches
      passed: [set-feature-pipelines]
      trigger: true
    - get: examples
  - task: find-inactive-workspaces
    config:
      platform: linux
      image_resource:
        type: registry-image
        source: {repository: hashicorp/terraform}
      inputs:
      - name: feature-branches
      outputs:
      - name: extra-workspaces
      params:
        TERRAFORM_BACKEND_CONFIG:
          gcs: *terraform_backend_config
      run:
        path: sh
        args:
        - -c
        - |
          set -euo pipefail

          apk add -q jq

          active_features="$(jq '[.[].groups.feature]' feature-branches/branches.json)"

          jq -n "{terraform: {backend: $TERRAFORM_BACKEND_CONFIG}}" > backend.tf.json
          terraform init

          # List all active workspaces, ignoring the default workspace
          active_workspaces="$(terraform workspace list | grep -v '^[*]' | tr -d ' ' | jq --raw-input --slurp 'split("\n") | map(select(. != ""))')"

          jq -n "$active_workspaces - $active_features" > extra-workspaces/workspaces.json
  - load_var: extra_workspaces
    file: extra-workspaces/workspaces.json
  - across:
    - var: workspace
      values: ((.:extra_workspaces))
    put: staging-env
    params:
      terraform_source: examples/terraform/staging
      env_name: ((.:workspace))
      action: destroy
    get_params:
      action: destroy