name: Unit plan

# Plan independently of static/type gates so checkout/diff/import-graph/timing work overlaps them; moving it out of unit-tests advanced shards by median 93s.
on:
  workflow_call:
    inputs:
      selection_mode:
        description: Shadow validates selection; selected applies it only to draft PRs.
        required: false
        default: shadow
        type: string

    outputs:
      shards:
        description: JSON array of shard assignments for the unit matrix.
        value: ${{ jobs.plan.outputs.shards }}

permissions:
  contents: read

jobs:
  plan:
    runs-on: ubuntu-24.04
    timeout-minutes: 5
    outputs:
      shards: ${{ steps.plan.outputs.shards }}
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 2
          persist-credentials: false
      - uses: ./.github/actions/install-node-dependencies
      - name: Plan unit selection
        id: plan
        env:
          ORCA_UNIT_SELECTION_MODE: ${{ inputs.selection_mode }}
          ORCA_PULL_REQUEST_DRAFT: ${{ github.event.pull_request.draft }}
          # Twelve 4-vCPU hosted shards match the old 8-vCPU wall time; the repository variable can request 2 to 16.
          ORCA_UNIT_FULL_SHARD_COUNT: ${{ vars.ORCA_UNIT_FULL_SHARD_COUNT || '12' }}
        run: node config/scripts/ci-unit-plan.mjs
      - uses: actions/upload-artifact@v7
        continue-on-error: true
        with:
          name: unit-selection-attempt-${{ github.run_attempt }}
          path: ci-shards/unit-selection.json
          retention-days: 14