name: CI

on:
  push:
  pull_request:

jobs:

  style-check:
    name: Code Style (autopep8)
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Install Python 3.12
        uses: actions/setup-python@v5
        with:
          python-version: "3.12"

      - name: Install PDM + autopep8
        run: |
          python -m pip install --upgrade pip
          pip install pdm autopep8

      - name: Install dependencies
        run: pdm install --dev

      - name: Run autopep8 style check
        run: |
          autopep8 --recursive --diff --exit-code --ignore E501 src
        continue-on-error: false


  tests:
    name: Tests (Python ${{ matrix.python-version }})
    runs-on: ubuntu-latest

    strategy:
      matrix:
        python-version: ["3.12", "3.13", "3.14"]

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Install Python
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}

      - name: Install PDM
        run: |
          python -m pip install --upgrade pip
          pip install pdm

      - name: Install dependencies
        run: pdm install --dev

      - name: Run tests
        run: pdm run test


  coverage:
    name: Coverage (Python 3.12)
    runs-on: ubuntu-latest
    needs: tests

    steps:
      - name: Checkout (with parent)
        uses: actions/checkout@v4
        with:
          fetch-depth: 2

      - name: Install Python 3.12
        uses: actions/setup-python@v5
        with:
          python-version: "3.12"

      - name: Install PDM
        run: |
          python -m pip install --upgrade pip
          pip install pdm

      - name: Run coverage on parent commit
        run: |
          git checkout HEAD^
          pdm install --dev
          pdm run coverage
          pdm run python -m coverage json -o /tmp/parent-coverage.json
          git checkout -

      - name: Install dependencies
        run: pdm install --dev

      - name: Run coverage on current commit
        run: |
          pdm run coverage
          pdm run python -m coverage json -o /tmp/current-coverage.json

      - name: Check coverage did not decrease
        run: |
          pdm run python -c "
          import json, sys
          with open('/tmp/parent-coverage.json') as f:
              parent = json.load(f)['totals']['percent_covered']
          with open('/tmp/current-coverage.json') as f:
              current = json.load(f)['totals']['percent_covered']
          print(f'Parent coverage: {parent:.2f}%')
          print(f'Current coverage: {current:.2f}%')
          if current < parent:
              print(f'ERROR: Coverage decreased by {parent - current:.2f}%')
              sys.exit(1)
          print(f'OK: Coverage maintained or improved by {current - parent:.2f}%')
          "