name: Check Black Formatting

on:
  pull_request:
    types: [opened, synchronize, reopened]

permissions:
  contents: read
  pull-requests: write

jobs:
  black-formatting:
    runs-on: ubuntu-latest

    steps:
    - name: Checkout code
      uses: actions/checkout@v2

    - name: Set up Python
      uses: actions/setup-python@v2
      with:
        python-version: '3.10'

    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install -r dev_requirements.txt
        pre-commit install

    - name: Run formatting check
      run: pre-commit run --all-files

    - name: Add PR review comment if formatting is incorrect
      if: failure()
      uses: actions/github-script@v4
      with:
        script: |
          const { pull_request } = context.payload;
          const comment = "Your code does not meet the Black formatting standards.\nPlease run `python3 -m pip install -r dev_requirements.txt && pre-commit install && pre-commit run --all-files` to format your code.";
          await github.issues.createComment({
            issue_number: pull_request.number,
            owner: context.repo.owner,
            repo: context.repo.repo,
            body: comment
          });