name: Dependabot auto-merge
on: pull_request_target

jobs:
  dependabot:
    runs-on: shopify-ubuntu-latest
    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
    steps:
      - name: Dependabot metadata
        id: metadata
        uses: dependabot/fetch-metadata@v1.6.0
        with:
          github-token: "${{ secrets.GITHUB_TOKEN }}"

      - name: Waiting for CI to finish
        id: check_ci_failure
        continue-on-error: true
        if: ${{ steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor' || steps.metadata.outputs.dependency-group == 'auto_merge' }}
        uses: actions/github-script@v6
        with:
          script: |
            function sleep(ms) {
              return new Promise(resolve => setTimeout(resolve, ms))
            }
            const query = `query ($org: String!, $repo: String!, $pullRequestNumber: Int!) {
                            organization(login: $org) {
                              repository(name: $repo) {
                                pullRequest(number: $pullRequestNumber) {
                                  commits(last: 1) {
                                    nodes {
                                      commit {
                                        status {
                                          state
                                        }
                                      }
                                    }
                                  }
                                }
                              }
                            }
                          }`;
            const variables = {
              org: context.repo.owner,
              repo: context.repo.repo,
              pullRequestNumber: context.issue.number
            }
            // Try for 30 minutes
            let attempts = 30
            let ci_state = false
            for (let i = 1; i <= attempts; i++) {
              console.log(`Sleeping for 60 seconds`)
              await sleep(60000)
              const result = await github.graphql(query, variables)
              const state = result["organization"]["repository"]["pullRequest"]["commits"]["nodes"][0]["commit"]["status"]["state"]
              console.log(`Status is ${state} after ${i} attempts`)
              if (state === "SUCCESS") {
                ci_state = true
                console.log("Proceeding with workflow as CI succeed")
                break
              }
            }
            core.setOutput("ci_state", ci_state)
      - name: Send Slack notification if auto-merge failed
        if: ${{ steps.check_ci_failure.outputs.ci_state == 'false' }}
        uses: ruby/action-slack@v3.0.0
        with:
          payload: |
            {
              "attachments": [{
                  "text": "Auto-merge failed for pull request <${{ github.event.pull_request.html_url }}|#${{ github.event.pull_request.number }}> in repository ${{ github.repository }}",
                  "color": "danger"
                }
              ]
            }
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.METRICS_SLACK_WEBHOOK_URL }}

      - name: Approve and merge
        if: ${{ steps.check_ci_failure.outputs.ci_state == 'true' && (steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor' || steps.metadata.outputs.dependency-group == 'auto_merge') }}
        uses: actions/github-script@v6
        with:
          script: |
            await github.rest.pulls.createReview({
              pull_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              event: 'APPROVE',
            })
            await github.rest.pulls.merge({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            })