name: Sync release branch

concurrency:
  group: sync-release-branch-${{ github.event_name }}-${{ github.ref }}
  cancel-in-progress: true

on:
  schedule:
    - cron:  '0 2 * * *'
  workflow_dispatch:

permissions:
  contents: read

jobs:
  create-pr:
    runs-on: ${{ endsWith(github.repository, '/emqx') && 'ubuntu-22.04' || fromJSON('["self-hosted","ephemeral","linux","x64"]') }}

    strategy:
      fail-fast: false
      matrix:
        branch:
          - release-57

    env:
      SYNC_BRANCH: ${{ matrix.branch }}

    defaults:
      run:
        shell: bash

    permissions:
      contents: write
      pull-requests: write

    steps:
      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
        with:
          fetch-depth: 0

      - name: create new branch
        run: |
          set -euxo pipefail
          NEW_BRANCH_NAME=sync-${SYNC_BRANCH}-$(date +"%Y%m%d-%H%M%S")
          echo "NEW_BRANCH_NAME=${NEW_BRANCH_NAME}" >> $GITHUB_ENV
          git config --global user.name "${GITHUB_ACTOR}"
          git config --global user.email "${GITHUB_ACTOR}@users.noreply.github.com"
          git checkout -b ${NEW_BRANCH_NAME}
          git merge origin/${SYNC_BRANCH} 2>&1 | tee merge.log
          git push origin ${NEW_BRANCH_NAME}:${NEW_BRANCH_NAME}

      - name: create pull request
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euxo pipefail
          for pr in $(gh pr list --state open --base master --label sync-release-branch --search "Sync ${SYNC_BRANCH} in:title" --repo ${{ github.repository }} --json number --jq '.[] | .number'); do
            gh pr close $pr --repo ${{ github.repository }} --delete-branch || true
          done
          gh pr create --title "Sync ${SYNC_BRANCH}" --body "Sync ${SYNC_BRANCH}" --base master --head ${NEW_BRANCH_NAME} --label sync-release-branch --repo ${{ github.repository }}

      - name: Send notification to Slack
        if: failure()
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
        run: |
          awk '{printf "%s\\n", $0}' merge.log > merge.log.1
          cat <<EOF > payload.json
          {
            "blocks": [
              {
                "type": "section",
                "text": {
                  "type": "mrkdwn",
                  "text": "Automatic sync of ${SYNC_BRANCH} branch failed: https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}"
                }
              },
              {
                "type": "section",
                "text": {
                  "type": "mrkdwn",
                  "text": "\`\`\`$(cat merge.log.1)\`\`\`"
                }
              }
            ]
          }
          EOF
          curl -X POST -H 'Content-type: application/json' --data @payload.json "$SLACK_WEBHOOK_URL"