name: Test old branches

on:
  # Verify the workflow is successful when this file is updated.
  push:
    branches:
      - master
      - trunk
    paths:
      - '.github/workflows/test-old-branches.yml'
  # Run twice a month on the 1st and 15th at 00:00 UTC.
  schedule:
    - cron: '0 0 1 * *'
    - cron: '0 0 15 * *'

jobs:
  dispatch-workflows-for-old-branches:
    name: ${{ matrix.workflow }} for ${{ matrix.branch }}
    runs-on: ubuntu-latest
    if: ${{ github.repository == 'WordPress/wordpress-develop' }}
    strategy:
      fail-fast: false
      matrix:
        workflow: [
            'coding-standards.yml',
            'javascript-tests.yml',
            'phpunit-tests.yml',
            'test-npm.yml'
        ]
        branch: [
            '5.8', '5.7', '5.6', '5.5', '5.4', '5.3', '5.2', '5.1', '5.0',
            '4.9', '4.8', '4.7', '4.6', '4.5', '4.4', '4.3', '4.2', '4.1', '4.0',
            '3.9', '3.8', '3.7'
        ]
        include:
          # PHP Compatibility testing was introduced in 5.5.
          - branch: '5.8'
            workflow: 'php-compatibility.yml'
          - branch: '5.7'
            workflow: 'php-compatibility.yml'
          - branch: '5.6'
            workflow: 'php-compatibility.yml'
          - branch: '5.5'
            workflow: 'php-compatibility.yml'

          # End to End testing was introduced in 5.3 but later removed as there were no meaningful assertions.
          # Only the officially supported major branch runs E2E tests so that more assertions can be added, and the
          # workflow does not continue to run needlessly on old branches.
          - branch: '5.8'
            workflow: 'end-to-end-tests.yml'
        exclude:
          # Coding standards and JavaScript testing did not take place in 3.7.
          - branch: '3.7'
            workflow: 'coding-standards.yml'
          - branch: '3.7'
            workflow: 'javascript-tests.yml'

    # Run all branches monthly, but only the currently supported one twice per month.
    steps:
      - name: Dispatch workflow run
        uses: actions/github-script@47f7cf65b5ced0830a325f705cad64f2f58dddf7 # v3.1.0
        if: ${{ github.event_name == 'push' || github.event.schedule == '0 0 15 * *' || matrix.branch == '5.7' }}
        with:
          github-token: ${{ secrets.GHA_OLD_BRANCH_DISPATCH }}
          script: |
            github.actions.createWorkflowDispatch({
              owner: context.repo.owner,
              repo: context.repo.repo,
              workflow_id: '${{ matrix.workflow }}',
              ref: '${{ matrix.branch }}'
            });