name: 'CI'
on: 
  pull_request:
  push:
    branches:
      - 'trunk'
      - 'release/*'
concurrency:
  group: '${{ github.workflow }}-${{ github.ref }}'
  cancel-in-progress: true
jobs:
  project-matrix:
    # Since this is a monorepo, not every pull request or change is going to impact every project.
    # Instead of running CI tasks on all projects indiscriminately, we use a script to detect
    # which projects have changed and what kind of change occurred. This lets us build a
    # matrix that we can use to run CI tasks only on the projects that need them.
    name: 'Build Project Matrix'
    runs-on: 'ubuntu-20.04'
    outputs:
      matrix: ${{ steps.project-matrix.outputs.matrix }}
    steps:
      - uses: 'actions/checkout@v3'
        name: 'Checkout'
        with:
          fetch-depth: 0
      - uses: './.github/actions/setup-woocommerce-monorepo'
        with:
          php-version: false # We don't want to waste time installing PHP since we aren't using it in this job.
        name: 'Setup Monorepo'
      - uses: actions/github-script@v6
        id: 'project-matrix'
        name: 'Build Matrix'
        with:
          script: |
            let baseRef = ${{ toJson( github.base_ref ) }};
            if ( baseRef ) {
              baseRef = 'origin/' + baseRef;
            }
            const buildCIMatrix = require( './.github/workflows/scripts/build-ci-matrix' );
            core.setOutput( 'matrix', JSON.stringify( await buildCIMatrix( baseRef ) ) );
  project-task-matrix:
    # This is the actual CI job that will be ran against every project with applicable changes.
    # Note that we only run the tasks that have commands set. Our script will set them if
    # they are needed and so all the workflow needs to do is run them.
    name: '${{ matrix.projectName }} - ${{ matrix.taskName }}' # Note: GitHub doesn't process expressions for skipped jobs so when there's no matrix the name will literally be this.
    runs-on: 'ubuntu-20.04'
    needs: 'project-matrix'
    if: ${{ needs.project-matrix.outputs.matrix != '[]' }}
    strategy:
      fail-fast: false
      matrix:
        include: ${{ fromJSON( needs.project-matrix.outputs.matrix ) }}
    steps:
      - uses: 'actions/checkout@v3'
        name: 'Checkout'
        with:
          fetch-depth: 0
      - uses: './.github/actions/setup-woocommerce-monorepo'
        id: 'setup-monorepo'
        name: 'Setup Monorepo'
        with:
          install: '${{ matrix.projectName }}...'
          build: '${{ matrix.projectName }}'
      - name: 'Lint'
        if: ${{ ! cancelled() && matrix.lintCommand && steps.setup-monorepo.conclusion == 'success' }}
        run: 'pnpm --filter="${{ matrix.projectName }}" ${{ matrix.lintCommand }}'
      - name: 'Prepare Test Environment'
        id: 'prepare-test-environment'
        if: ${{ ! cancelled() && matrix.testEnvCommand && steps.setup-monorepo.conclusion == 'success' }}
        env: ${{ matrix.testEnvVars }}
        run: 'pnpm --filter="${{ matrix.projectName }}" ${{ matrix.testEnvCommand }}'
      - name: 'Test - JS'
        if: ${{ ! cancelled() && matrix.jsTestCommand && steps.setup-monorepo.conclusion == 'success' && ( ! matrix.testEnvCommand || steps.prepare-test-environment.conclusion == 'success' ) }}
        run: 'pnpm --filter="${{ matrix.projectName }}" ${{ matrix.jsTestCommand }}'
      - name: 'Test - PHP'
        if: ${{ ! cancelled() && matrix.phpTestCommand && steps.setup-monorepo.conclusion == 'success' && ( ! matrix.testEnvCommand || steps.prepare-test-environment.conclusion == 'success' ) }}
        run: 'pnpm --filter="${{ matrix.projectName }}" ${{ matrix.phpTestCommand }}'
  project-task-matrix-evaluation:
    # In order to add a required status check we need a consistent job that we can grab onto.
    # Since we are dynamically generating a project matrix, however, we can't rely on
    # on any specific job being present. We can get around this limitation by using
    # a job that runs after all the others and either passes or fails based on the
    # results of the other jobs in the workflow.
    name: 'Evaluate Project Matrix'
    runs-on: 'ubuntu-20.04'
    needs: [ 
      'project-matrix',
      'project-task-matrix'
    ]
    if: ${{ always() }}
    steps:
      - name: 'Check Matrix Success'
        run: |
          result="${{ needs.project-matrix.result }}"
          if [[ $result != "success" && $result != "skipped" ]]; then
            echo "An error occurred generating the CI matrix."
            exit 1
          fi
          result="${{ needs.project-task-matrix.result }}"
          if [[ $result != "success" && $result != "skipped" ]]; then
            echo "One or more jobs in the matrix has failed."
            exit 1
          fi
          echo "The matrix has completed successfully."