name: "Check amalgamation"

on:
  pull_request_target:

jobs:
  check:
    runs-on: ubuntu-latest
    env:
      MAIN_DIR: ${{ github.workspace }}/main
      INCLUDE_DIR: ${{ github.workspace }}/main/single_include/nlohmann
      TOOL_DIR: ${{ github.workspace }}/tools/tools/amalgamate
      ASTYLE_FLAGS: >
        --style=allman --indent=spaces=4 --indent-modifiers --indent-switches --indent-preproc-block
        --indent-preproc-define --indent-col1-comments --pad-oper --pad-header --align-pointer=type
        --align-reference=type --add-brackets --convert-tabs --close-templates --lineend=linux --preserve-date
        --formatted

    steps:
      - name: Checkout pull request
        uses: actions/checkout@v3
        with:
          path: main
          ref: ${{ github.event.pull_request.head.sha }}

      - name: Checkout tools
        uses: actions/checkout@v3
        with:
          path: tools
          ref: develop

      - name: Install astyle
        run: |
          sudo apt-get update
          sudo apt-get install astyle

      - name: Check amalgamation
        run: |
          cd $MAIN_DIR

          rm -fr $INCLUDE_DIR/json.hpp~ $INCLUDE_DIR/json_fwd.hpp~
          cp $INCLUDE_DIR/json.hpp $INCLUDE_DIR/json.hpp~
          cp $INCLUDE_DIR/json_fwd.hpp $INCLUDE_DIR/json_fwd.hpp~

          python3 $TOOL_DIR/amalgamate.py -c $TOOL_DIR/config_json.json -s .
          python3 $TOOL_DIR/amalgamate.py -c $TOOL_DIR/config_json_fwd.json -s .
          echo "Format (1)"
          astyle $ASTYLE_FLAGS --suffix=none --quiet $INCLUDE_DIR/json.hpp $INCLUDE_DIR/json_fwd.hpp

          diff $INCLUDE_DIR/json.hpp~ $INCLUDE_DIR/json.hpp
          diff $INCLUDE_DIR/json_fwd.hpp~ $INCLUDE_DIR/json_fwd.hpp

          astyle $ASTYLE_FLAGS $(find docs/examples include tests -type f \( -name '*.hpp' -o -name '*.cpp' -o -name '*.cu' \) -not -path 'tests/thirdparty/*' -not -path 'tests/abi/include/nlohmann/*' | sort)
          echo Check
          find $MAIN_DIR -name '*.orig' -exec false {} \+

      - name: Comment on pull request
        if: failure()
        uses: actions/github-script@v6
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            const author = context.payload.pull_request.user.login
            const opts = github.rest.issues.listForRepo.endpoint.merge({
              owner: context.repo.owner,
              repo: context.repo.repo,
              creator: author,
              state: 'all'
            })

            let first = true
            const issues = await github.paginate(opts)
            for (const issue of issues) {
              if (issue.number === context.issue.number) {
                continue
              }

              if (issue.pull_request) {
                first = false
                break
              }
            }

            await github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: '## 🔴 Amalgamation check failed! 🔴\nThe source code has not been amalgamated.'
                    + (first ? ' @' + author + ' Please read and follow the [Contribution Guidelines]'
                               + '(https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md#files-to-change).'
                             : '')
              })
