name: Check branch version

# This is a separate workflow from the main build-and-test workflow
# because we want it to run when a PR's target branch changes, and
# it'd be prohibitively time-consuming to re-run the main workflow
# every time that happens.

"on":
  push:
    branches:
      - master
      - release/v*
  pull_request:
    branches:
      - master
      - release/v*
    types:
      - opened   # default
      - reopened # default
      - edited   # default
      - synchronize # also run if the target branch changes

jobs:
  check-branch-version:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - name: Install Deps
        uses: ./.github/actions/setup-deps
      - name: Detect version numbers
        id: get-versions
        run: |
          # Set tag_majorminor
          tag_majorminor=$(git describe --tags --match='v*'|sed 's/^v//'|cut -d. -f1,2)
          echo "tag_majorminor=${tag_majorminor}" >> $GITHUB_OUTPUT

          # Set branch_majorminor
          case "$GITHUB_REF" in
            refs/heads/*) branch=${GITHUB_REF#refs/heads/};;
            refs/pull/*)  branch=${GITHUB_BASE_REF#refs/heads/};;
          esac
          if [[ $branch == master ]]; then
             prev_branch_majorminor=$(git for-each-ref --format='%(refname:lstrip=4)' 'refs/remotes/origin/release/v*' | sort --version-sort | tail -n1 | sed 's/^v//')
             if [[ "${prev_branch_majorminor%.*}" == "${tag_majorminor%.*}" ]]; then
               branch_majorminor="${prev_branch_majorminor%.*}.$((${prev_branch_majorminor##*.}+1))"
             else
               branch_majorminor="$((${prev_branch_majorminor%.*}+1)).0"
             fi
          else
             branch_majorminor=${branch#release/v}
          fi
          echo "branch_majorminor=${branch_majorminor}" >> $GITHUB_OUTPUT

          # Set relnotes_majorminor
          make tools/bin/yq
          relnotes_version=$(tools/bin/yq read docs/releaseNotes.yml items[0].version)
          relnotes_majorminor=$(cut -d. -f1,2 <<<"$relnotes_version")
          echo "relnotes_majorminor=${relnotes_majorminor}" >> $GITHUB_OUTPUT

          declare -p tag_majorminor branch_majorminor relnotes_majorminor
      - name: Check version numbers
        run: |
          tag_majorminor=${{ steps.get-versions.outputs.tag_majorminor }}
          branch_majorminor=${{ steps.get-versions.outputs.branch_majorminor }}
          relnotes_majorminor=${{ steps.get-versions.outputs.relnotes_majorminor }}
          declare -p tag_majorminor branch_majorminor relnotes_majorminor

          # Check that those all agree
          if [[ "$tag_majorminor" != "$branch_majorminor" ]]; then
            echo "You seem to be on the Git branch for v${branch_majorminor}.z, but Git tags indicate that this is work for v${tag_majorminor}.z"
            echo "Perhaps you need to go yell at the person who set up the release branch for the last .y bump."
            exit 1
          fi
          if [[ "$relnotes_majorminor" != "$tag_majorminor" ]]; then
            echo "Your Git tag+branch indicate that you are targeting v${tag_majorminor}.z but your docs/releaseNotes.yml indicate that you are targeting v${relnotes_majorminor}.z"
            exit 1
          fi