# Only runs if anything under the packages/ directory changes.
---
name: Levitate / Detect breaking changes in PR

on:
  pull_request:
    paths:
      - 'packages/**'
    branches:
      - 'main'

jobs:
  buildPR:
    name: Build PR
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: './pr'

    steps:
      - uses: actions/checkout@v4
        with:
          path: './pr'
      - uses: actions/setup-node@v4
        with:
          node-version: 20.9.0

      - name: Get yarn cache directory path
        id: yarn-cache-dir-path
        run: echo "dir=$(yarn config get cacheFolder)" >> $GITHUB_OUTPUT

      - name: Restore yarn cache
        uses: actions/cache@v4
        id: yarn-cache
        with:
          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
          key: yarn-cache-folder-${{ hashFiles('**/yarn.lock', '.yarnrc.yml') }}
          restore-keys: |
            yarn-cache-folder-

      - name: Install dependencies
        run: yarn install --immutable

      - name: Build packages
        run: yarn packages:build

      - name: Pack packages
        run: yarn packages:pack --out ./%s.tgz

      - name: Zip built tarballed packages
        run: zip -r ./pr_built_packages.zip ./packages/**/*.tgz

      - name: Upload build output as artifact
        uses: actions/upload-artifact@v4
        with:
          name: buildPr
          path: './pr/pr_built_packages.zip'

  buildBase:
    name: Build Base
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: './base'

    steps:
      - uses: actions/checkout@v4
        with:
          path: './base'
          ref: ${{ github.event.pull_request.base.ref }}

      - uses: actions/setup-node@v4
        with:
          node-version: 20.9.0

      - name: Get yarn cache directory path
        id: yarn-cache-dir-path
        run: echo "dir=$(yarn config get cacheFolder)" >> $GITHUB_OUTPUT

      - name: Restore yarn cache
        uses: actions/cache@v4
        id: yarn-cache
        with:
          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
          key: yarn-cache-folder-${{ hashFiles('**/yarn.lock', '.yarnrc.yml') }}
          restore-keys: |
            yarn-cache-folder-

      - name: Install dependencies
        run: yarn install --immutable

      - name: Build packages
        run: yarn packages:build

      - name: Pack packages
        run: yarn packages:pack --out ./%s.tgz

      - name: Zip built tarballed packages
        run: zip -r ./base_built_packages.zip ./packages/**/*.tgz

      - name: Upload build output as artifact
        uses: actions/upload-artifact@v4
        with:
          name: buildBase
          path: './base/base_built_packages.zip'

  Detect:
    name: Detect breaking changes
    runs-on: ubuntu-latest
    needs: ['buildPR', 'buildBase']
    env:
      GITHUB_STEP_NUMBER: 8

    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: 20.9.0

      - name: Get built packages from pr
        uses: actions/download-artifact@v4
        with:
          name: buildPr

      - name: Get built packages from base
        uses: actions/download-artifact@v4
        with:
          name: buildBase

      - name: Unzip artifact from pr
        run: unzip -j pr_built_packages.zip -d ./pr && rm pr_built_packages.zip

      - name: Unzip artifact from base
        run: unzip -j base_built_packages.zip -d ./base && rm base_built_packages.zip

      - name: Get link for the Github Action job
        id: job
        uses: actions/github-script@v6
        with:
          script: |
              const name = 'Detect breaking changes';
              const script = require('./.github/workflows/scripts/pr-get-job-link.js')
              await script({name, github, context, core})

      - name: Detect breaking changes
        id: breaking-changes
        run: ./scripts/check-breaking-changes.sh
        env:
          FORCE_COLOR: 3
          GITHUB_JOB_LINK: ${{ steps.job.outputs.link }}

      - name: Persisting the check output
        run: |
            mkdir -p ./levitate
            echo "{ \"exit_code\": ${{ steps.breaking-changes.outputs.is_breaking }}, \"message\": \"${{ steps.breaking-changes.outputs.message }}\", \"job_link\": \"${{ steps.job.outputs.link }}#step:${GITHUB_STEP_NUMBER}:1\", \"pr_number\": \"${{ github.event.pull_request.number }}\" }" > ./levitate/result.json

      - name: Upload check output as artifact
        uses: actions/upload-artifact@v4
        with:
          name: levitate
          path: levitate/


  Report:
    name: Report breaking changes in PR
    runs-on: ubuntu-latest
    needs: ['Detect']

    steps:
      - name: "Generate token"
        id: generate_token
        uses: tibdex/github-app-token@b62528385c34dbc9f38e5f4225ac829252d1ea92
        with:
          app_id: ${{ secrets.GRAFANA_PR_AUTOMATION_APP_ID }}
          private_key: ${{ secrets.GRAFANA_PR_AUTOMATION_APP_PEM }}

      - uses: actions/checkout@v4

      - name: 'Download artifact'
        uses: actions/download-artifact@v4
        with:
          name: levitate

      - name: Parsing levitate result
        uses: actions/github-script@v6
        id: levitate-run
        with:
          script: |
            const filePath = 'result.json';
            const script = require('./.github/workflows/scripts/json-file-to-job-output.js');
            await script({ core, filePath });

      # Check if label exists
      - name: Check if "levitate breaking change" label exists
        id: does-label-exist
        uses: actions/github-script@v6
        env:
          PR_NUMBER: ${{ github.event.pull_request.number }}
        with:
          script: |
            const { data } = await github.rest.issues.listLabelsOnIssue({
              issue_number: process.env.PR_NUMBER,
              owner: context.repo.owner,
              repo: context.repo.repo,
            });
            const labels = data.map(({ name }) => name);
            const doesExist = labels.includes('levitate breaking change');

            return doesExist ? 1 : 0;

      # put the markdown into a variable
      - name: Levitate Markdown
        id: levitate-markdown
        run: |
            if [ -f "levitate.md" ]; then
            {
              echo 'levitate_markdown<<EOF'
              cat levitate.md
              echo EOF
            } >> $GITHUB_OUTPUT
            else
              echo "levitate_markdown=No breaking changes detected" >> $GITHUB_OUTPUT
            fi


      # Comment on the PR
      - name: Comment on PR
        if: steps.levitate-run.outputs.exit_code == 1
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          header: levitate-breaking-change-comment
          number: ${{ github.event.pull_request.number }}
          message: |
            ⚠️ &nbsp;&nbsp;**Possible breaking changes (md version)**&nbsp;&nbsp; ⚠️

            ${{ steps.levitate-markdown.outputs.levitate_markdown }}

            [Read our guideline](https://github.com/grafana/grafana/blob/main/contribute/breaking-changes-guide/breaking-changes-guide.md)
            [Console output](${{ steps.levitate-run.outputs.job_link }})
          GITHUB_TOKEN: ${{ steps.generate_token.outputs.token }}

      # Remove comment from the PR (no more breaking changes)
      - name: Remove comment from PR
        if: steps.levitate-run.outputs.exit_code == 0
        uses: marocchino/sticky-pull-request-comment@v2
        with:
          header: levitate-breaking-change-comment
          number: ${{ github.event.pull_request.number }}
          delete: true
          GITHUB_TOKEN: ${{ steps.generate_token.outputs.token }}

      # Posts a notification to Slack if a PR has a breaking change and it did not have a breaking change before
      - name: Post to Slack
        id: slack
        if: steps.levitate-run.outputs.exit_code == 1 && steps.does-label-exist.outputs.result == 0 && env.HAS_SECRETS
        uses: slackapi/slack-github-action@v1.26.0
        with:
          payload: |
            {
              "pr_link": "https://github.com/grafana/grafana/pull/${{ steps.levitate-run.outputs.pr_number }}",
              "pr_number": "${{ steps.levitate-run.outputs.pr_number }}",
              "job_link": "${{ steps.levitate-run.outputs.job_link }}",
              "reporting_job_link": "${{ github.event.workflow_run.html_url }}",
              "message": "${{ steps.levitate-run.outputs.message }}"
            }
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_LEVITATE_WEBHOOK_URL }}
          HAS_SECRETS: ${{ (github.repository == 'grafana/grafana' || secrets.SLACK_LEVITATE_WEBHOOK_URL != '') || '' }}

      # Add the label
      - name: Add "levitate breaking change" label
        if: steps.levitate-run.outputs.exit_code == 1 && steps.does-label-exist.outputs.result == 0
        uses: actions/github-script@v6
        env:
          PR_NUMBER: ${{ steps.levitate-run.outputs.pr_number }}
        with:
          github-token: ${{ steps.generate_token.outputs.token }}
          script: |
            await github.rest.issues.addLabels({
              issue_number: process.env.PR_NUMBER,
              owner: context.repo.owner,
              repo: context.repo.repo,
              labels: ['levitate breaking change']
            })

      # Remove label (no more breaking changes)
      - name: Remove "levitate breaking change" label
        if: steps.levitate-run.outputs.exit_code == 0 && steps.does-label-exist.outputs.result == 1
        uses: actions/github-script@v6
        env:
          PR_NUMBER: ${{ steps.levitate-run.outputs.pr_number }}
        with:
          github-token: ${{ steps.generate_token.outputs.token }}
          script: |
            await github.rest.issues.removeLabel({
              issue_number: process.env.PR_NUMBER,
              owner: context.repo.owner,
              repo: context.repo.repo,
              name: 'levitate breaking change'
            })

      # Add reviewers
      # This is very weird, the actual request goes through (comes back with a 201), but does not assign the team.
      # Related issue: https://github.com/renovatebot/renovate/issues/1908
      - name: Add "grafana/plugins-platform-frontend" as a reviewer
        if: steps.levitate-run.outputs.exit_code == 1
        uses: actions/github-script@v6
        env:
          PR_NUMBER: ${{ steps.levitate-run.outputs.pr_number }}
        with:
          github-token: ${{ steps.generate_token.outputs.token }}
          script: |
            await github.rest.pulls.requestReviewers({
              pull_number: process.env.PR_NUMBER,
              owner: context.repo.owner,
              repo: context.repo.repo,
              reviewers: [],
              team_reviewers: ['plugins-platform-frontend']
            });

      # Remove reviewers (no more breaking changes)
      - name: Remove "grafana/plugins-platform-frontend" from the list of reviewers
        if: steps.levitate-run.outputs.exit_code == 0
        uses: actions/github-script@v6
        env:
          PR_NUMBER: ${{ steps.levitate-run.outputs.pr_number }}
        with:
          github-token: ${{ steps.generate_token.outputs.token }}
          script: |
            await github.rest.pulls.removeRequestedReviewers({
              pull_number: process.env.PR_NUMBER,
              owner: context.repo.owner,
              repo: context.repo.repo,
              reviewers: [],
              team_reviewers: ['plugins-platform-frontend']
            });

      - name: Exit
        run: exit ${{ steps.levitate-run.outputs.exit_code }}
        shell: bash