name: Caterium Promote Production

on:
  workflow_run:
    workflows: ["Caterium QA"]
    types: [completed]

permissions:
  contents: write

concurrency:
  group: caterium-production-promotion
  cancel-in-progress: false

jobs:
  promote:
    if: >-
      ${{ github.event.workflow_run.conclusion == 'success' &&
          github.event.workflow_run.event == 'push' &&
          github.event.workflow_run.head_branch == 'main' }}
    runs-on: ubuntu-latest
    steps:
      - name: Checkout verified main
        uses: actions/checkout@v4
        with:
          ref: main
          fetch-depth: 0

      - name: Verify promoted commit
        shell: bash
        run: |
          set -euo pipefail
          expected="${{ github.event.workflow_run.head_sha }}"
          actual="$(git rev-parse HEAD)"
          if [ "$actual" != "$expected" ]; then
            echo "Refusing promotion: main moved after the verified QA run."
            echo "verified=$expected current=$actual"
            exit 1
          fi

      - name: Promote to production branch
        shell: bash
        run: |
          set -euo pipefail
          git push origin HEAD:refs/heads/production