.github/workflows/ruff-linter.yml

name: Lint (Ruff)
on:
  pull_request:


permissions:
  contents: write

jobs:
  ruff-check:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0   
          ref: ${{ github.head_ref }}

      # Install uv and activate cache
      - uses: astral-sh/setup-uv@v3
      - name: Cache uv
        uses: actions/cache@v4
        with:
          path: ~/.cache/uv
          key: uv-${{ runner.os }}-${{ hashFiles('pyproject.toml', 'uv.lock') }}

      # Install dev deps
      - name: Sync dev deps
        run: uv sync --dev

      # find changed .py files
      - name: Ruff on changed files (format then check)
        id: ruff_check_changed_files
        run: |
          set -euo pipefail
          BASE_REF="${{ github.base_ref }}"
          git fetch --no-tags origin "$BASE_REF" --prune

          git diff --name-only --diff-filter=ACMRT "origin/$BASE_REF...HEAD" > /tmp/changed_all.txt

          CHANGED=$(grep -E '\.py$' /tmp/changed_all.txt || true)
          if [ -z "$CHANGED" ]; then
            echo "Any Modified file .py: skip Ruff."
            echo "has_py_changes=false" >> $GITHUB_OUTPUT
            exit 0
          fi

          echo "Modified Python Files:"
          echo "$CHANGED" | sed 's/^/ - /'

          
          echo "$CHANGED" > /tmp/changed_py.txt
          echo "has_py_changes=true" >> $GITHUB_OUTPUT

      # Autofix
      - name: Ruff autofix on changed files
        if: steps.ruff_check_changed_files.outputs.has_py_changes == 'true'
        id: ruff_autofix
        run: |
          set -euo pipefail

          CHANGED=$(cat /tmp/changed_py.txt)

          echo "Ruff autofix on these files:"
          echo "$CHANGED" | sed 's/^/ - /'

          # --- FIX ---
          uv run ruff format $CHANGED || true

          # Lint con fix
          uv run ruff check --fix $CHANGED || true

          if uv run ruff check $CHANGED 2>&1 | tee /tmp/ruff_check_result.txt; then
            echo "No remaining issues"
            echo "has_remaining_issues=false" >> $GITHUB_OUTPUT
          else
            echo "Found remaining issues that cannot be auto-fixed"
            echo "has_remaining_issues=true" >> $GITHUB_OUTPUT
          fi


      #  Commit on pull request 
      - name: Commit and push changes
        if: steps.ruff_check_changed_files.outputs.has_py_changes == 'true'
        run: |
          set -euo pipefail

         
          if [ -z "$(git status --porcelain)" ]; then
            echo "No changes to commit after Ruff autofix."
            exit 0
          fi

          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

          git add .
          git commit -m "chore: apply ruff check and format auto-fix"
          git push origin HEAD:${{ github.head_ref }}


      # Fail if there are remaining issues
      - name: Fail if remaining issues
        if: steps.ruff_check_changed_files.outputs.has_py_changes == 'true' && steps.ruff_autofix.outputs.has_remaining_issues == 'true'
        run: |
          echo "Found errors that cannot be auto-fixed:"
          cat /tmp/ruff_check_result.txt
          exit 1