name: Ruff

on:
  push:
    branches:
      - main
      - dev
    paths:
      - 'backend/**'
      - 'pyproject.toml'
  pull_request:
    branches:
      - main
      - dev
    paths:
      - 'backend/**'
      - 'pyproject.toml'

jobs:
  ruff:
    name: 'Lint & Format Backend'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Get changed Python files
        id: changed
        run: |
          if [ "${{ github.event_name }}" = "pull_request" ]; then
            BASE=${{ github.event.pull_request.base.sha }}
          else
            BASE=${{ github.event.before }}
          fi
          FILES=$(git diff --name-only --diff-filter=ACMR "$BASE" HEAD -- 'backend/**.py' | xargs)
          echo "files=$FILES" >> "$GITHUB_OUTPUT"

      - name: Ruff check
        if: steps.changed.outputs.files != ''
        uses: astral-sh/ruff-action@v3
        with:
          args: check ${{ steps.changed.outputs.files }}

      - name: Ruff format
        if: steps.changed.outputs.files != ''
        uses: astral-sh/ruff-action@v3
        with:
          args: format --check ${{ steps.changed.outputs.files }}