name: Release
on:
  workflow_dispatch:

jobs:
  assemble:
    uses: ./.github/workflows/reusable-assemble.yml

  test:
    uses: ./.github/workflows/reusable-test.yml

  # test-latest-deps is intentionally not included in the release workflows
  # because any time a new library version is released to maven central
  # it can fail due to test code incompatibility with the new library version,
  # or due to slight changes in emitted telemetry

  smoke-test:
    uses: ./.github/workflows/reusable-smoke-test.yml

  # muzzle is intentionally not included in the release workflows
  # because any time a new library version is released to maven central it can fail,
  # and this is not a reason to hold up the release

  gradle-plugins:
    uses: ./.github/workflows/reusable-gradle-plugins.yml

  examples:
    uses: ./.github/workflows/reusable-examples.yml

  release:
    needs:
      - assemble
      - test
      - smoke-test
      - gradle-plugins
      - examples
    runs-on: ubuntu-latest
    steps:
      - run: |
          if [[ $GITHUB_REF_NAME != release/* ]]; then
            echo this workflow should only be run against release branches
            exit 1
          fi

      - uses: actions/checkout@v3
        with:
          # tags are needed for the generate-release-contributors.sh script
          fetch-depth: 0

      - uses: actions/setup-java@v3
        with:
          distribution: temurin
          java-version: 17

      - name: Build and publish artifacts
        uses: gradle/gradle-build-action@v2
        with:
          arguments: assemble publishToSonatype closeAndReleaseSonatypeStagingRepository
        env:
          SONATYPE_USER: ${{ secrets.SONATYPE_USER }}
          SONATYPE_KEY: ${{ secrets.SONATYPE_KEY }}
          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
          GPG_PASSWORD: ${{ secrets.GPG_PASSWORD }}

      - name: Build and publish gradle plugins
        uses: gradle/gradle-build-action@v2
        env:
          SONATYPE_USER: ${{ secrets.SONATYPE_USER }}
          SONATYPE_KEY: ${{ secrets.SONATYPE_KEY }}
          GRADLE_PUBLISH_KEY: ${{ secrets.GRADLE_PUBLISH_KEY }}
          GRADLE_PUBLISH_SECRET: ${{ secrets.GRADLE_PUBLISH_SECRET }}
          GPG_PRIVATE_KEY: ${{ secrets.GPG_PRIVATE_KEY }}
          GPG_PASSWORD: ${{ secrets.GPG_PASSWORD }}
        with:
          # Don't use publishToSonatype since we don't want to publish the marker artifact
          arguments: build publishPlugins publishPluginMavenPublicationToSonatypeRepository closeAndReleaseSonatypeStagingRepository
          build-root-directory: gradle-plugins

      - name: Set environment variables
        run: |
          version=$(.github/scripts/get-version.sh)
          if [[ $version =~ ^([0-9]+)\.([0-9]+)\.([0-9]+) ]]; then
            major="${BASH_REMATCH[1]}"
            minor="${BASH_REMATCH[2]}"
            patch="${BASH_REMATCH[3]}"
          else
            echo "unexpected version: $version"
            exit 1
          fi
          if [[ $patch == 0 ]]; then
            if [[ $minor == 0 ]]; then
              prior_major=$((major - 1))
              prior_minor=$(grep -Po "^## Version $prior_major.\K[0-9]+" CHANGELOG.md | head -1)
              prior_version="$prior_major.$prior_minor"
            else
              prior_version="$major.$((minor - 1)).0"
            fi
          else
            prior_version="$major.$minor.$((patch - 1))"
          fi
          echo "VERSION=$version" >> $GITHUB_ENV
          echo "PRIOR_VERSION=$prior_version" >> $GITHUB_ENV

        # check out main branch to verify there won't be problems with merging the change log
        # at the end of this workflow
      - uses: actions/checkout@v3
        with:
          ref: main

      - run: |
          if [[ $VERSION == *.0 ]]; then
            # not making a patch release
            if ! grep --quiet "^## Version $VERSION " CHANGELOG.md; then
              echo the pull request generated by prepare-release-branch.yml needs to be merged first
              exit 1
            fi
          fi

        # back to the release branch
      - uses: actions/checkout@v3

      - name: Generate release notes
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # conditional blocks not indented because of the heredoc
          if [[ $VERSION == *.0 ]]; then
          cat > /tmp/release-notes.txt << EOF
          This release targets the OpenTelemetry SDK $VERSION.

          Note that all artifacts other than \`io.opentelemetry.javaagent:opentelemetry-javaagent\` have the \`-alpha\` suffix attached to their version number, reflecting that they are still alpha quality and will continue to have breaking changes. Please see the [VERSIONING.md](https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/VERSIONING.md#opentelemetry-java-instrumentation-versioning) for more details.

          EOF
          else
          cat > /tmp/release-notes.txt << EOF
          This is a patch release on the previous $PRIOR_VERSION release, fixing the issue(s) below.

          EOF
          fi

          # CHANGELOG_SECTION.md is also used at the end of the release workflow
          # for copying the change log updates to main
          sed -n "0,/^## Version $VERSION /d;/^## Version /q;p" CHANGELOG.md \
            > /tmp/CHANGELOG_SECTION.md

          # the complex perl regex is needed because markdown docs render newlines as soft wraps
          # while release notes render them as line breaks
          perl -0pe 's/(?<!\n)\n *(?!\n)(?![-*] )(?![1-9]+\. )/ /g' /tmp/CHANGELOG_SECTION.md \
            >> /tmp/release-notes.txt

          # conditional block not indented because of the heredoc
          if [[ $VERSION == *.0 ]]; then
          cat >> /tmp/release-notes.txt << EOF

          ### 🙇 Thank you
          This release was possible thanks to the following contributors who shared their brilliant ideas and awesome pull requests:

          EOF

          .github/scripts/generate-release-contributors.sh v$PRIOR_VERSION >> /tmp/release-notes.txt
          fi

      - name: Create GitHub release
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          cp javaagent/build/libs/opentelemetry-javaagent-${VERSION}.jar opentelemetry-javaagent.jar
          gh release create --target $GITHUB_REF_NAME \
                            --title "Version $VERSION" \
                            --notes-file /tmp/release-notes.txt \
                            --discussion-category announcements \
                            v$VERSION \
                            opentelemetry-javaagent.jar

      - uses: actions/checkout@v3
        with:
          # the step below is creating a pull request against main
          ref: main

      - name: Copy change log updates to main
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          if [[ $VERSION == *.0 ]]; then
            # this was not a patch release, so the version exists already in the CHANGELOG.md

            # update the release date
            date=$(gh release view v$VERSION --json publishedAt --jq .publishedAt | sed 's/T.*//')
            sed -Ei "s/## Version $VERSION .*/## Version $VERSION ($date)/" CHANGELOG.md

            # the entries are copied over from the release branch to support workflows
            # where change log entries may be updated after preparing the release branch

            # copy the portion above the release, up to and including the heading
            sed -n "0,/^## Version $VERSION ($date)/p" CHANGELOG.md > /tmp/CHANGELOG.md

            # copy the release notes
            cat /tmp/CHANGELOG_SECTION.md >> /tmp/CHANGELOG.md

            # copy the portion below the release
            sed -n "0,/^## Version $VERSION /d;0,/^## Version /{/^## Version/!d};p" CHANGELOG.md \
              >> /tmp/CHANGELOG.md

            # update the real CHANGELOG.md
            cp /tmp/CHANGELOG.md CHANGELOG.md
          else
            # this was a patch release, so the version does not exist already in the CHANGELOG.md

            # copy the portion above the top-most release, not including the heading
            sed -n "0,/^## Version /{ /^## Version /!p }" CHANGELOG.md > /tmp/CHANGELOG.md

            # add the heading
            date=$(gh release view v$VERSION --json publishedAt --jq .publishedAt | sed 's/T.*//')
            echo "## Version $VERSION ($date)" >> /tmp/CHANGELOG.md

            # copy the release notes
            cat /tmp/CHANGELOG_SECTION.md >> /tmp/CHANGELOG.md

            # copy the portion starting from the top-most release
            sed -n "/^## Version /,\$p" CHANGELOG.md >> /tmp/CHANGELOG.md

            # update the real CHANGELOG.md
            cp /tmp/CHANGELOG.md CHANGELOG.md
          fi

      - name: Set git user
        run: .github/scripts/set-git-user.sh

      - name: Create pull request against main
        env:
          # not using secrets.GITHUB_TOKEN since pull requests from that token do not run workflows
          GITHUB_TOKEN: ${{ secrets.BOT_TOKEN }}
        run: |
          message="Copy change log updates from $GITHUB_REF_NAME"
          body="Copy log updates from \`$GITHUB_REF_NAME\`."
          branch="copy-change-log-updates-from-${GITHUB_REF_NAME//\//-}"

          if [[ $VERSION == *.0 ]]; then
            if git diff --quiet; then
              echo there are no updates needed to the change log on main, not creating pull request
              exit 0 # success
            fi
          fi

          git commit -a -m "$message"
          git push origin HEAD:$branch
          gh pr create --title "$message" \
                       --body "$body" \
                       --head $branch \
                       --base main

      - uses: actions/checkout@v3
        with:
          repository: opentelemetry-java-bot/opentelemetry-operator
          # this is the personal access token used for "git push" below
          token: ${{ secrets.BOT_TOKEN }}

      - name: Initialize pull request branch
        run: |
          git remote add upstream https://github.com/open-telemetry/opentelemetry-operator.git
          git fetch upstream
          git checkout -b update-opentelemetry-javaagent-to-${VERSION} upstream/main

      - name: Update version
        run: |
          echo $VERSION > autoinstrumentation/java/version.txt

      - name: Set git user
        run: .github/scripts/set-git-user.sh

      - name: Create pull request against opentelemetry-operator
        env:
          # this is the personal access token used for "gh pr create" below
          GITHUB_TOKEN: ${{ secrets.BOT_TOKEN }}
        run: |
          message="Update the javaagent version to $VERSION"
          body="Update the javaagent version to \`$VERSION\`."

          # gh pr create doesn't have a way to explicitly specify different head and base
          # repositories currently, but it will implicitly pick up the head from a different
          # repository if you set up a tracking branch

          git commit -a -m "$message"
          git push --set-upstream origin update-opentelemetry-javaagent-to-${VERSION}
          gh pr create --title "$message" \
                       --body "$body" \
                       --repo open-telemetry/opentelemetry-operator \
                       --base main