name: Levitate / Report breaking changes

on:
  workflow_run:
    workflows: ["Levitate / Detect breaking changes"]
    types: [completed]

jobs:
  notify:
    name: Report
    runs-on: ubuntu-latest
    env:
      ARTIFACT_NAME: 'levitate' # The name of the artifact that we would like to download
      ARTIFACT_FOLDER: '${{ github.workspace }}/tmp' # The name of the folder where we will download the artifact to

    steps:
    - uses: actions/checkout@v3

    # Download artifact (as a .zip archive)
    - name: 'Download artifact'
      uses: actions/github-script@v6
      env:
        RUN_ID: ${{ github.event.workflow_run.id }}
      with:
        script: |
          const fs = require('fs');

          const { owner, repo } = context.repo;
          const runId = process.env.RUN_ID;
          const artifactName = process.env.ARTIFACT_NAME;
          const artifactFolder = process.env.ARTIFACT_FOLDER;
          const artifacts = await github.rest.actions.listWorkflowRunArtifacts({
              owner,
              repo,
              run_id: runId,
          });
          const artifact = artifacts.data.artifacts.find(a => a.name === artifactName);
        
          if (!artifact) {
              throw new Error(`Could not find artifact ${ artifactName } in workflow (${ runId })`);
          }

          const download = await github.rest.actions.downloadArtifact({
              owner,
              repo,
              artifact_id: artifact.id,
              archive_format: 'zip',
          });

          fs.mkdirSync(artifactFolder, { recursive: true });
          fs.writeFileSync(`${ artifactFolder }/${ artifactName }.zip`, Buffer.from(download.data));
        
    # Unzip artifact
    - name: Unzip artifact
      run: unzip "${ARTIFACT_FOLDER}/${ARTIFACT_NAME}.zip" -d "${ARTIFACT_FOLDER}"
    
     # Parse the artifact and register fields as step output variables
      # (All fields in the JSON will be available as ${{ steps.levitate-run.outputs.<field-name> }}
    - name: Parsing levitate result
      uses: actions/github-script@v6
      id: levitate-run
      with:
        script: |
          const filePath = `${ process.env.ARTIFACT_FOLDER }/result.json`;
          const script = require('./.github/workflows/scripts/json-file-to-job-output.js');
          await script({ core, filePath });

    # Skip - print a message if the "Detect" workflow was skipped
    - name: Check if the workflow should be skipped
      if: steps.levitate-run.outputs.shouldSkip == 'true'
      run: echo "Skipping."

    # Check if label exists
    - name: Check if "levitate breaking change" label exists
      id: does-label-exist
      if: steps.levitate-run.outputs.shouldSkip != 'true'
      uses: actions/github-script@v6
      env:
        PR_NUMBER: ${{ github.event.workflow_run.pull_requests[0].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;

    # Comment on the PR
    - name: Comment on PR
      if: steps.levitate-run.outputs.exit_code == 1 && steps.levitate-run.outputs.shouldSkip != 'true'
      uses: marocchino/sticky-pull-request-comment@v2
      with:
        number: ${{ steps.levitate-run.outputs.pr_number }}
        message: |
          ⚠️ &nbsp;&nbsp;**Possible breaking changes**

          _(Open the links below in a new tab to go to the correct steps)_

          ${{ steps.levitate-run.outputs.message }}

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

    # Remove comment from the PR (no more breaking changes)
    - name: Remove comment from PR
      if: steps.levitate-run.outputs.exit_code == 0 && steps.levitate-run.outputs.shouldSkip != 'true'
      uses: marocchino/sticky-pull-request-comment@v2
      with:
        number: ${{ steps.levitate-run.outputs.pr_number }}
        delete: true

    # 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 && steps.levitate-run.outputs.shouldSkip != 'true'
      uses: slackapi/slack-github-action@v1.24.0
      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 }}

    # Add the label
    - name: Add "levitate breaking change" label
      if: steps.levitate-run.outputs.exit_code == 1 && steps.does-label-exist.outputs.result == 0 && steps.levitate-run.outputs.shouldSkip != 'true'
      uses: actions/github-script@v6
      env:
        PR_NUMBER: ${{ steps.levitate-run.outputs.pr_number }}
      with:
        github-token: ${{ secrets.GH_BOT_ACCESS_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 && steps.levitate-run.outputs.shouldSkip != 'true'
      uses: actions/github-script@v6
      env:
        PR_NUMBER: ${{ steps.levitate-run.outputs.pr_number }}
      with:
        github-token: ${{ secrets.GH_BOT_ACCESS_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 && steps.levitate-run.outputs.shouldSkip != 'true'
      uses: actions/github-script@v6
      env:
        PR_NUMBER: ${{ steps.levitate-run.outputs.pr_number }}
      with:
        github-token: ${{ secrets.GH_BOT_ACCESS_TOKEN }}
        script: |
          await github.rest.pulls.requestReviewers({
            pull_number: process.env.PR_NUMBER,
            owner: context.repo.owner,
            repo: context.repo.repo,
            reviewers: [],
            team_reviewers: ['grafana/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 && steps.levitate-run.outputs.shouldSkip != 'true'
      uses: actions/github-script@v6
      env:
        PR_NUMBER: ${{ steps.levitate-run.outputs.pr_number }}
      with:
        github-token: ${{ secrets.GH_BOT_ACCESS_TOKEN }}
        script: |
          await github.rest.pulls.removeRequestedReviewers({
            pull_number: process.env.PR_NUMBER,
            owner: context.repo.owner,
            repo: context.repo.repo,
            reviewers: [],
            team_reviewers: ['grafana/plugins-platform-frontend']
          });