name: coverage

on:
  push:
  pull_request:

jobs:
  test-with-coverage:
    runs-on: ubuntu-latest

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

      - name: Install Nix
        uses: cachix/install-nix-action@v31

      - name: Run tests with bisect_ppx
        run: |
          nix develop --option builders '' --command sh -c 'BISECT_ENABLE=YES dune runtest --instrument-with bisect_ppx --force'

      - name: Generate coverage reports
        run: |
          nix develop --option builders '' --command sh -c 'bisect-ppx-report summary --coverage-path _build/default/test > coverage-summary.txt'
          nix develop --option builders '' --command sh -c 'bisect-ppx-report html --coverage-path _build/default/test --tree -o _coverage'

      - name: Upload coverage artifacts
        uses: actions/upload-artifact@v4
        with:
          name: coverage-report
          path: |
            coverage-summary.txt
            coverage/
            _coverage/
          if-no-files-found: warn