name: release

on:
  workflow_call:
    inputs:
      working-directory:
        required: true
        type: string
        description: "From which folder this pipeline executes"

env:
  PYTHON_VERSION: "3.10"
  POETRY_VERSION: "1.6.1"

jobs:
  build:
    if: github.ref == 'refs/heads/master'
    runs-on: ubuntu-latest

    outputs:
      pkg-name: ${{ steps.check-version.outputs.pkg-name }}
      version: ${{ steps.check-version.outputs.version }}

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python + Poetry ${{ env.POETRY_VERSION }}
        uses: "./.github/actions/poetry_setup"
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          poetry-version: ${{ env.POETRY_VERSION }}
          working-directory: ${{ inputs.working-directory }}
          cache-key: release

      # We want to keep this build stage *separate* from the release stage,
      # so that there's no sharing of permissions between them.
      # The release stage has trusted publishing and GitHub repo contents write access,
      # and we want to keep the scope of that access limited just to the release job.
      # Otherwise, a malicious `build` step (e.g. via a compromised dependency)
      # could get access to our GitHub or PyPI credentials.
      #
      # Per the trusted publishing GitHub Action:
      # > It is strongly advised to separate jobs for building [...]
      # > from the publish job.
      # https://github.com/pypa/gh-action-pypi-publish#non-goals
      - name: Build project for distribution
        run: poetry build
        working-directory: ${{ inputs.working-directory }}

      - name: Upload build
        uses: actions/upload-artifact@v3
        with:
          name: dist
          path: ${{ inputs.working-directory }}/dist/

      - name: Check Version
        id: check-version
        shell: bash
        working-directory: ${{ inputs.working-directory }}
        run: |
          echo pkg-name="$(poetry version | cut -d ' ' -f 1)" >> $GITHUB_OUTPUT
          echo version="$(poetry version --short)" >> $GITHUB_OUTPUT

  test-pypi-publish:
    needs:
      - build
    uses:
      ./.github/workflows/_test_release.yml
    with:
      working-directory: ${{ inputs.working-directory }}
    secrets: inherit

  pre-release-checks:
    needs:
      - build
      - test-pypi-publish
    runs-on: ubuntu-latest
    steps:
      # We explicitly *don't* set up caching here. This ensures our tests are
      # maximally sensitive to catching breakage.
      #
      # For example, here's a way that caching can cause a falsely-passing test:
      # - Make the langchain package manifest no longer list a dependency package
      #   as a requirement. This means it won't be installed by `pip install`,
      #   and attempting to use it would cause a crash.
      # - That dependency used to be required, so it may have been cached.
      #   When restoring the venv packages from cache, that dependency gets included.
      # - Tests pass, because the dependency is present even though it wasn't specified.
      # - The package is published, and it breaks on the missing dependency when
      #   used in the real world.
      - uses: actions/setup-python@v4
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      - name: Test published package
        shell: bash
        env:
          PKG_NAME: ${{ needs.build.outputs.pkg-name }}
          VERSION: ${{ needs.build.outputs.version }}
        # Here we use:
        # - The default regular PyPI index as the *primary* index, meaning 
        #   that it takes priority (https://pypi.org/simple)
        # - The test PyPI index as an extra index, so that any dependencies that
        #   are not found on test PyPI can be resolved and installed anyway.
        #   (https://test.pypi.org/simple). This will include the PKG_NAME==VERSION
        #   package because VERSION will not have been uploaded to regular PyPI yet.
        #
        # TODO: add more in-depth pre-publish tests after testing that importing works
        run: |
          pip install \
            --extra-index-url https://test.pypi.org/simple/ \
            "$PKG_NAME==$VERSION"

          # Replace all dashes in the package name with underscores,
          # since that's how Python imports packages with dashes in the name.
          IMPORT_NAME="$(echo "$PKG_NAME" | sed s/-/_/g)"

          python -c "import $IMPORT_NAME; print(dir($IMPORT_NAME))"

  publish:
    needs:
      - build
      - test-pypi-publish
      - pre-release-checks
    runs-on: ubuntu-latest
    permissions:
      # This permission is used for trusted publishing:
      # https://blog.pypi.org/posts/2023-04-20-introducing-trusted-publishers/
      #
      # Trusted publishing has to also be configured on PyPI for each package:
      # https://docs.pypi.org/trusted-publishers/adding-a-publisher/
      id-token: write

    defaults:
      run:
        working-directory: ${{ inputs.working-directory }}

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python + Poetry ${{ env.POETRY_VERSION }}
        uses: "./.github/actions/poetry_setup"
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          poetry-version: ${{ env.POETRY_VERSION }}
          working-directory: ${{ inputs.working-directory }}
          cache-key: release

      - uses: actions/download-artifact@v3
        with:
          name: dist
          path: ${{ inputs.working-directory }}/dist/

      - name: Publish package distributions to PyPI
        uses: pypa/gh-action-pypi-publish@release/v1
        with:
          packages-dir: ${{ inputs.working-directory }}/dist/
          verbose: true
          print-hash: true

  mark-release:
    needs:
      - build
      - test-pypi-publish
      - pre-release-checks
      - publish
    runs-on: ubuntu-latest
    permissions:
      # This permission is needed by `ncipollo/release-action` to
      # create the GitHub release.
      contents: write

    defaults:
      run:
        working-directory: ${{ inputs.working-directory }}

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python + Poetry ${{ env.POETRY_VERSION }}
        uses: "./.github/actions/poetry_setup"
        with:
          python-version: ${{ env.PYTHON_VERSION }}
          poetry-version: ${{ env.POETRY_VERSION }}
          working-directory: ${{ inputs.working-directory }}
          cache-key: release

      - uses: actions/download-artifact@v3
        with:
          name: dist
          path: ${{ inputs.working-directory }}/dist/

      - name: Create Release
        uses: ncipollo/release-action@v1
        if: ${{ inputs.working-directory == 'libs/langchain' }}
        with:
          artifacts: "dist/*"
          token: ${{ secrets.GITHUB_TOKEN }}
          draft: false
          generateReleaseNotes: true
          tag: v${{ needs.build.outputs.version }}
          commit: master