name: fuzz

on:
  push:
    branches: main
  pull_request:
    paths:
      - .github/workflows/fuzz.yml
      - scripts/fuzz.py
  schedule:
    - cron: "0 0 * * *"
  workflow_dispatch:

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  fuzz:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        # TODO: add 3.15; relies on libcst which doesn't support 3.15 yet
        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]

    steps:
      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false

      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
        with:
          python-version: ${{ matrix.python-version }}
          allow-prereleases: true
          pip-version: "25.3"
          pip-install: --group tox

      - name: Run fuzz tests
        id: fuzz
        run: tox -e fuzz --result-json $python_ver
        env:
          python_ver: ${{ matrix.python-version }}

      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        if: failure() && steps.fuzz.outcome == 'failure'
        with:
          name: ${{ matrix.python-version }}
          path: ${{ matrix.python-version }}

  create-issue:
    runs-on: ubuntu-latest
    needs: fuzz
    if:
      github.repository == 'psf/black' && github.event_name != 'pull_request' &&
      failure()
    permissions:
      issues: write # Needed to create issue
    steps:
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          merge-multiple: true
          path: ./output

      - name: Generate issue data
        run: |
          output=issue-body.html
          touch $output
          for FILE in ./output/*; do
            echo "**Python $(basename $FILE)**" >> $output
            echo -e "\`\`\`py" >> $output
              echo -e "# stdout:" >> $output
              echo -e "$(jq .testenvs.fuzz.test[-1].output $FILE -r)\n" >> $output
              echo -e "# stderr:" >> $output
              echo -e "$(jq .testenvs.fuzz.test[-1].err $FILE -r)" >> $output
            echo -e "\`\`\`\n" >> $output
          done

      - name: Get existing issue
        id: issue
        run: |
          echo "ISSUE=$( gh issue list \
          -A github-actions[bot] -l 'ci: fuzz error' \
          --json number -q .[0].number \
          -R $REPO )" >> $GITHUB_OUTPUT
        env:
          GITHUB_TOKEN: ${{ github.token }}
          REPO: ${{ github.repository }}

      - name: Create new issue
        if: steps.issue.outputs.ISSUE == ''
        run: >
          gh issue create -t "Fuzz test failure" -F issue-body.html -l "ci: fuzz error"
          -R $REPO
        env:
          GITHUB_TOKEN: ${{ github.token }}
          REPO: ${{ github.repository }}

      - name: Edit existing issue
        if: steps.issue.outputs.ISSUE != ''
        run: gh issue edit $ISSUE -F issue-body.html -R $REPO
        env:
          GITHUB_TOKEN: ${{ github.token }}
          REPO: ${{ github.repository }}
          ISSUE: ${{ steps.issue.outputs.ISSUE }}