name: Build Docs
# https://github.com/marketplace/actions/sphinx-build

on:
  push:
    branches: ["master", "release/*"]
    tags: ["*"]
  # use this event type to share secrets with forks.
  # it's important that the PR head SHA is checked out to run the changes
  pull_request_target:
    branches: ["master", "release/*"]
    paths:
      - ".actions/**"
      - ".github/workflows/docs-build.yml"
      - "requirements/**"
      - "docs/**"
      - "src/**"
      - "setup.py"
      - "pyproject.toml"  # includes metadata used in the package creation
      - "!*.md"
      - "!**/*.md"

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}-${{ github.head_ref }}
  cancel-in-progress: ${{ ! (github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/heads/release/')) }}

defaults:
  run:
    shell: bash

env:
  FREEZE_REQUIREMENTS: "1"
  TORCH_URL: "https://download.pytorch.org/whl/cpu/torch_stable.html"
  PYPI_CACHE: "_pip-wheels"

jobs:
  make-doctest:
    runs-on: ubuntu-latest
    container:
      image: pytorchlightning/pytorch_lightning:docs
    strategy:
      fail-fast: false
      matrix:
        pkg-name: ["app", "fabric", "pytorch"]
    steps:
      - uses: actions/checkout@v3
        with:
          submodules: true
          ref: ${{ github.event.pull_request.head.sha }}

      - uses: aws-actions/configure-aws-credentials@v2
        if: ${{ matrix.pkg-name != 'pytorch' }}
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_KEY_ID }}
          aws-region: us-east-1

      - run: aws s3 sync s3://sphinx-packages/ pypi/
        if: ${{ matrix.pkg-name != 'pytorch' }}

      - name: pip wheels cache
        uses: actions/cache/restore@v3
        with:
          path: ${{ env.PYPI_CACHE }}
          key: pypi_wheels

      - name: Install package
        run: |
          mkdir -p $PYPI_CACHE
          ls -lh $PYPI_CACHE
          pip install -e .[extra,cloud,ui] -U -r requirements/${{ matrix.pkg-name }}/docs.txt -f pypi -f ${TORCH_URL}
          pip list

      - name: Test Documentation
        env:
          SPHINX_MOCK_REQUIREMENTS: 0
        working-directory: ./docs/source-${{ matrix.pkg-name }}
        run: |
          make doctest
          make coverage


  make-html:
    runs-on: ubuntu-latest
    container:
      image: pytorchlightning/pytorch_lightning:docs
    strategy:
      fail-fast: false
      matrix:
        pkg-name: ["app", "fabric", "pytorch"]
    steps:
      - uses: actions/checkout@v3
        with:
          submodules: true
          ref: ${{ github.event.pull_request.head.sha }}

      - uses: aws-actions/configure-aws-credentials@v2
        if: ${{ matrix.pkg-name != 'pytorch' }}
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_KEY_ID }}
          aws-region: us-east-1

      - run: aws s3 sync s3://sphinx-packages/ pypi/
        if: ${{ matrix.pkg-name != 'pytorch' }}

      - name: pip wheels cache
        uses: actions/cache/restore@v3
        with:
          path: ${{ env.PYPI_CACHE }}
          key: pypi_wheels

      - name: Install package & dependencies
        run: |
          mkdir -p $PYPI_CACHE
          ls -lh $PYPI_CACHE
          pip --version
          pip install -e . -U -r requirements/${{ matrix.pkg-name }}/docs.txt -f pypi -f ${TORCH_URL}
          pip list
        shell: bash

      - name: Make Documentation
        working-directory: ./docs/source-${{ matrix.pkg-name }}
        run: make html --debug --jobs $(nproc) SPHINXOPTS="-W --keep-going"

      - name: Check External Links in Sphinx Documentation (Optional)
        working-directory: ./docs/source-${{ matrix.pkg-name }}
        run: make linkcheck
        continue-on-error: true

      - name: Keep artifact
        id: keep-artifact
        run: python -c "print('DAYS=' + str(7 if '${{ github.event_name }}'.startswith('pull_request') else 0))" >> $GITHUB_OUTPUT

      - name: Upload built docs
        uses: actions/upload-artifact@v3
        with:
          name: docs-${{ matrix.pkg-name }}-${{ github.sha }}
          path: docs/build/html/
          retention-days: ${{ steps.keep-artifact.outputs.DAYS }}


  deploy-docs:
    needs: [make-doctest, make-html]
    if: github.repository_owner == 'Lightning-AI' && github.event_name == 'push'
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        pkg-name: ["app", "fabric", "pytorch"]
    steps:
      - uses: actions/download-artifact@v3
        with:
          name: docs-${{ matrix.pkg-name }}-${{ github.sha }}
          path: docs/build/html/

      - name: Authenticate to Google Cloud
        uses: google-github-actions/auth@v1
        with:
          credentials_json: ${{ secrets.GCS_SA_KEY }}

      - name: Setup gcloud
        uses: google-github-actions/setup-gcloud@v1
        with:
          project_id: ${{ secrets.GCS_PROJECT }}

      # Uploading docs to GCS, so they can be served on lightning.ai
      - name: Upload docs/${{ matrix.pkg-name }}/stable to GCS 🪣
        if: startsWith(github.ref, 'refs/heads/release/')
        run: gsutil -m rsync -d -R docs/build/html/ gs://lightning-docs-${{ matrix.pkg-name }}/stable

      # Uploading docs to GCS, so they can be served on lightning.ai
      - name: Upload docs/${{ matrix.pkg-name }}/latest to GCS 🪣
        if: github.ref == 'refs/heads/master'
        run: gsutil -m rsync -d -R docs/build/html/ gs://lightning-docs-${{ matrix.pkg-name }}/latest

      # Uploading docs to GCS, so they can be served on lightning.ai
      - name: Upload docs/${{ matrix.pkg-name }}/release to GCS 🪣
        if: startsWith(github.ref, 'refs/tags/')
        run: gsutil -m rsync -d -R docs/build/html/ gs://lightning-docs-${{ matrix.pkg-name }}/${{  github.ref_name }}