# Copyright 2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

name: GitHub Release

# Runs when a new tag is created that looks like a version number.
#
# 1. Creates a draft release on GitHub with the latest release notes
# 2. On all combinations of OS, build type, and library type:
#    a. builds Packager
#    b. builds the docs
#    c. runs all tests
#    d. attaches build artifacts to the release
# 3. Fully publishes the release on GitHub
#
# Publishing the release then triggers additional workflows for NPM, Docker
# Hub, and GitHub Pages.
#
# Can also be run manually for debugging purposes.
on:
  push:
    tags:
      - "v*.*"
  # For manual debugging:
  workflow_dispatch:
    inputs:
      tag:
        description: "An existing tag to release."
        required: True

jobs:
  # TODO(joeyparrish): Switch to release-please
  setup:
    name: Setup
    runs-on: ubuntu-latest
    outputs:
      tag: ${{ steps.compute_tag.outputs.tag }}
    steps:
      - name: Compute tag
        id: compute_tag
        # We could be building from a workflow dispatch (manual run)
        # or from a pushed tag.  If triggered from a pushed tag, we would like
        # to strip refs/tags/ off of the incoming ref and just use the tag
        # name.  Subsequent jobs can refer to the "tag" output of this job to
        # determine the correct tag name in all cases.
        run: |
          # Strip refs/tags/ from the input to get the tag name, then store
          # that in output.
          echo "::set-output name=tag::${{ github.event.inputs.tag || github.ref }}" \
            | sed -e 's@refs/tags/@@'

  # TODO(joeyparrish): Switch to release-please
  draft_release:
    name: Create GitHub release
    needs: setup
    runs-on: ubuntu-latest
    outputs:
      release_id: ${{ steps.draft_release.outputs.id }}
    steps:
      - name: Checkout code
        uses: actions/checkout@v2
        with:
          ref: ${{ needs.setup.outputs.tag }}

      - name: Check changelog version
        # This check prevents releases without appropriate changelog updates.
        run: |
          VERSION=$(packager/tools/extract_from_changelog.py --version)
          if [[ "$VERSION" != "${{ needs.setup.outputs.tag }}" ]]; then
            echo ""
            echo ""
            echo "***** ***** *****"
            echo ""
            echo "Version mismatch!"
            echo "Workflow is targetting ${{ needs.setup.outputs.tag }},"
            echo "but CHANGELOG.md contains $VERSION!"
            exit 1
          fi

      - name: Extract release notes
        run: |
          packager/tools/extract_from_changelog.py --release_notes \
              | tee ../RELEASE_NOTES.md

      - name: Draft release
        id: draft_release
        uses: actions/create-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          tag_name: ${{ needs.setup.outputs.tag }}
          release_name: ${{ needs.setup.outputs.tag }}
          body_path: RELEASE_NOTES.md
          draft: true

  lint:
    needs: setup
    name: Lint
    uses: ./.github/workflows/lint.yaml
    with:
      ref: ${{ needs.setup.outputs.tag }}

  build_and_test:
    needs: [setup, lint, draft_release]
    name: Build and test
    uses: ./.github/workflows/build.yaml
    with:
      ref: ${{ needs.setup.outputs.tag }}

  test_supported_linux_distros:
    # Doesn't really "need" it, but let's not waste time on a series of docker
    # builds just to cancel it because of a linter error.
    needs: lint
    name: Test Linux distros
    uses: ./.github/workflows/test-linux-distros.yaml
    with:
      ref: ${{ needs.setup.outputs.tag }}

  # TODO(joeyparrish): Switch to release-please
  publish_release:
    name: Publish GitHub release
    needs: [draft_release, build_and_test]
    runs-on: ubuntu-latest
    steps:
      - name: Publish release
        uses: eregon/publish-release@v1
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        with:
          release_id: ${{ needs.draft_release.outputs.release_id }}