name: Merge Dependabot PR

on: pull_request_target

run-name: Merge Dependabot PR ${{ github.ref_name }}

permissions: write-all

jobs:
  merge-dependabot-pr:
    runs-on: ubuntu-latest
    if: github.actor == 'dependabot[bot]'
    steps:

      - uses: actions/checkout@v4
        with:
          show-progress: false
          ref: ${{ github.event.pull_request.head.sha }}

      - uses: actions/setup-java@v4
        with:
          distribution: temurin
          java-version: 17

      - name: Set Milestone to Dependabot Pull Request
        id: set-milestone
        run: |
          if test -f pom.xml
          then
            CURRENT_VERSION=$(mvn help:evaluate -Dexpression="project.version" -q -DforceStdout)
          else
            CURRENT_VERSION=$(cat gradle.properties | sed -n '/^version=/ { s/^version=//;p }')
          fi
          export CANDIDATE_VERSION=${CURRENT_VERSION/-SNAPSHOT}
          MILESTONE=$(gh api repos/$GITHUB_REPOSITORY/milestones --jq 'map(select(.due_on != null and (.title | startswith(env.CANDIDATE_VERSION)))) | .[0] | .title')
          
          if [ -z $MILESTONE ]
          then
            gh run cancel ${{ github.run_id }}
            echo "::warning title=Cannot merge::No scheduled milestone for $CURRENT_VERSION version"
          else
            gh pr edit ${{ github.event.pull_request.number }} --milestone $MILESTONE
            echo mergeEnabled=true >> $GITHUB_OUTPUT
          fi
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Merge Dependabot pull request
        if: steps.set-milestone.outputs.mergeEnabled
        run: gh pr merge ${{ github.event.pull_request.number }} --auto --rebase
        env:
          GH_TOKEN: ${{ secrets.GH_ACTIONS_REPO_TOKEN }}