name: Current refactorings

on: [pull_request_target]
env:
  RATIONALE: "Adapt to new FairLogger API"
  REFACTORING: "s|LOGP[(]ERROR|LOGP(error|g;s|LOGP[(]INFO|LOGP(info|g;s|LOGP[(]WARNING|LOGP(warning|g;s|LOGP[(]WARN|LOGP(warn|g;s|LOGP[(]DEBUG|LOGP(debug|;s|LOG[(]ERROR|LOG(error|g;s|LOG[(]INFO|LOG(info|g;s|LOG[(]WARNING|LOG(warning|g;s|LOG[(]WARN|LOG(warn|g;s|LOG[(]DEBUG|LOG(debug|g"

jobs:
  build:
    # We need at least 20.04 to install clang-format-11.
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v5
      with:
        ref: ${{ github.event.pull_request.head.sha }}
        persist-credentials: false
        # We need the history of the dev branch all the way back to where the PR
        # diverged. We're fetching everything here, as we don't know how many
        # commits back that point is.
        fetch-depth: 0

    - name: Run refactoring 
      id: run_refactoring
      env:
        ALIBUILD_GITHUB_TOKEN: ${{secrets.ALIBUILD_GITHUB_TOKEN}}
      run: |
        set -x
        # We need to fetch the other commit.
        git fetch origin ${{ github.event.pull_request.base.ref }} \
                         pull/${{ github.event.pull_request.number }}/head:${{ github.event.pull_request.head.ref }}

        # We create a new branch which we will use for the eventual PR.
        git config --global user.email "alibuild@cern.ch"
        git config --global user.name "ALICE Action Bot"
        git checkout -b alibot-refactor-${{ github.event.pull_request.number }} ${{ github.event.pull_request.head.sha }}

        # github.event.pull_request.base.sha is the latest commit on the branch
        # the PR will be merged into, NOT the commit this PR derives from! For
        # that, we need to find the latest common ancestor between the PR and
        # the branch we are merging into.
        BASE_COMMIT=$(git merge-base HEAD ${{ github.event.pull_request.base.sha }})
        echo "Running refactoring against branch ${{ github.event.pull_request.base.ref }}, with hash ${{ github.event.pull_request.base.sha }}"
        COMMIT_FILES=$(git diff --diff-filter d --name-only $BASE_COMMIT)
        if [ -z "$COMMIT_FILES" ]; then
          echo "No files to check" >&2
          echo clean=true >> "$GITHUB_OUTPUT"
          exit 0
        fi
        perl -p -i -e "${{ env.REFACTORING }}" $COMMIT_FILES

        if git diff --exit-code; then
          echo "Refactoring not needed."
          git push --set-upstream https://alibuild:$ALIBUILD_GITHUB_TOKEN@github.com/alibuild/AliceO2.git :alibot-refactoring-${{ github.event.pull_request.number }} -f || true
          echo clean=true >> "$GITHUB_OUTPUT"
        else
          git commit -m "${{ env.RATIONALE }}" -a
          git show | cat
          git fetch https://github.com/AliceO2Group/AliceO2.git pull/${{ github.event.pull_request.number }}/head
          git push --set-upstream https://alibuild:$ALIBUILD_GITHUB_TOKEN@github.com/alibuild/AliceO2.git HEAD:refs/heads/alibot-refactoring-${{ github.event.pull_request.number }} -f
          echo clean=false >> "$GITHUB_OUTPUT"
        fi

    - name: pull-request
      uses: alisw/pull-request@master
      with:
        source_branch: 'alibuild:alibot-refactoring-${{ github.event.pull_request.number }}'
        destination_branch: '${{ github.event.pull_request.head.label }}'
        github_token: ${{ secrets.ALIBUILD_GITHUB_TOKEN }}
        pr_title: "Please consider the refactoring changes to AliceO2Group/AliceO2#${{ github.event.pull_request.number }}"
        pr_body: | 
          AliceO2Group/AliceO2#${{ github.event.pull_request.number }}" cannot be merged as is.
          You should either modify your code according to what is done in this PR, or directly merge this PR in yours.
          The rationale for this change is:
          ${{ env.RATIONALE }}

      continue-on-error: true # We do not create PRs if the branch is not there.

    - name: Exit with error if the PR is not clean
      run: |
        case ${{ steps.run_refactoring.outputs.clean }} in
          true) echo "PR clean" ; exit 0 ;;
          false) echo "PR not clean" ; exit 1 ;;
        esac