name: Publish Python package

on:
  push:
    branches: [main]
    paths: ['pyproject.toml']
  # Manual fallback: re-publish the current version without a version bump
  # (e.g. first run after PyPI trusted publishing is configured).
  workflow_dispatch:

permissions:
  contents: read

jobs:
  check-version:
    name: Check version change
    # Guard manual dispatches too: PyPI trusted publishing matches
    # repo+workflow+environment but NOT branch, so without this a
    # workflow_dispatch from any branch could publish unmerged code.
    if: github.ref == 'refs/heads/main'
    runs-on: ubuntu-latest
    outputs:
      changed: ${{ steps.check.outputs.changed }}
      published: ${{ steps.check.outputs.published }}
      version: ${{ steps.check.outputs.version }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 2

      - name: Check if version changed
        id: check
        run: |
          NEW_VERSION=$(python3 -c 'import pathlib, tomllib; print(tomllib.loads(pathlib.Path("pyproject.toml").read_text())["project"]["version"])')
          echo "version=$NEW_VERSION" >> "$GITHUB_OUTPUT"

          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            # Manual dispatch always rebuilds and publishes. Combined with
            # skip-existing on the publish step, this repairs partial releases
            # (PyPI's version endpoint returns 200 even when only some of the
            # expected wheels were uploaded).
            echo "manual dispatch: publishing v$NEW_VERSION (skip-existing handles uploaded files)"
            echo "changed=true" >> "$GITHUB_OUTPUT"
            echo "published=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          # .get(): the parent commit may predate the static version field
          # (pyproject.toml used dynamic = ["version"]) — treat that as a change
          # so the very first merge of this workflow publishes.
          OLD_VERSION=$(git show HEAD~1:pyproject.toml | python3 -c 'import sys, tomllib; print(tomllib.loads(sys.stdin.read())["project"].get("version", ""))')
          echo "old=$OLD_VERSION new=$NEW_VERSION"

          if [ "$NEW_VERSION" = "$OLD_VERSION" ]; then
            echo "changed=false" >> "$GITHUB_OUTPUT"
            echo "published=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          echo "changed=true" >> "$GITHUB_OUTPUT"

          HTTP_STATUS=$(curl --silent --show-error --output /tmp/pypi-version.json --write-out "%{http_code}" \
            "https://pypi.org/pypi/pdf-inspector/$NEW_VERSION/json")

          case "$HTTP_STATUS" in
            200)
              echo "published=true" >> "$GITHUB_OUTPUT"
              echo "pdf-inspector v$NEW_VERSION is already published to PyPI"
              ;;
            404)
              echo "published=false" >> "$GITHUB_OUTPUT"
              ;;
            *)
              cat /tmp/pypi-version.json
              echo "Unexpected PyPI response: $HTTP_STATUS" >&2
              exit 1
              ;;
          esac

  build:
    needs: check-version
    if: needs.check-version.outputs.changed == 'true' && needs.check-version.outputs.published == 'false'
    name: Build ${{ matrix.target }}
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        include:
          - os: ubuntu-latest
            target: x86_64-unknown-linux-gnu
          - os: ubuntu-latest
            target: aarch64-unknown-linux-gnu
          # macos-13 was retired by GitHub; macos-15-intel is the remaining
          # Intel runner label (available through 2027).
          - os: macos-15-intel
            target: x86_64-apple-darwin
          - os: macos-14
            target: aarch64-apple-darwin
          - os: windows-latest
            target: x86_64-pc-windows-msvc
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: '3.12'

      - name: Build wheel
        uses: PyO3/maturin-action@v1
        with:
          target: ${{ matrix.target }}
          args: --release --out dist
          manylinux: auto

      - name: Upload wheel
        uses: actions/upload-artifact@v4
        with:
          name: wheels-${{ matrix.target }}
          path: dist/*.whl
          if-no-files-found: error

  sdist:
    needs: check-version
    if: needs.check-version.outputs.changed == 'true' && needs.check-version.outputs.published == 'false'
    name: Build sdist
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Build sdist
        uses: PyO3/maturin-action@v1
        with:
          command: sdist
          args: --out dist

      - name: Upload sdist
        uses: actions/upload-artifact@v4
        with:
          name: sdist
          path: dist/*.tar.gz
          if-no-files-found: error

  publish:
    name: Publish to PyPI
    needs: [check-version, build, sdist]
    runs-on: ubuntu-latest
    environment: pypi
    permissions:
      contents: read
      id-token: write
    steps:
      - name: Download all artifacts
        uses: actions/download-artifact@v4
        with:
          path: dist
          merge-multiple: true

      - name: List artifacts
        run: ls -la dist/

      - name: Publish to PyPI
        uses: pypa/gh-action-pypi-publish@release/v1
        with:
          packages-dir: dist
          # Tolerate already-uploaded files so a manual re-run can complete
          # a release that previously failed partway through.
          skip-existing: true