# This is the composite action:
#   https://docs.github.com/en/actions/creating-actions/creating-a-composite-action
#
# Composite actions have some limitations:
#   - many contexts are unavailable, e.g. `runner`
#   - `env` can be specified per-step only
#   - if `run` is used, `shell` must be explicitly specified
name: 'Calculate matrix for `node_modules` prefetch'
inputs:
  repo:
    description: 'Repository name'
    required: true
  token:
    description: 'GitHub token'
    required: true
  node-version:
    description: 'Node version'
    required: true
outputs:
  matrix:
    description: 'Matrix of OSes to prefetch `node_modules` for'
    value: ${{ steps.os-matrix-prefetch.outputs.os-matrix-prefetch }}
runs:
  using: 'composite'
  steps:
    - name: Calculate cache keys
      id: cache-keys
      env:
        HASH: ${{ hashFiles('pnpm-lock.yaml') }}
      shell: bash
      run: |
        echo 'MACOS_KEY=node_modules-macOS-${{ inputs.node-version }}-${{ env.HASH }}' >> "$GITHUB_ENV"
        echo 'WINDOWS_KEY=node_modules-Windows-${{ inputs.node-version }}-${{ env.HASH }}' >> "$GITHUB_ENV"

    - name: Check cache miss for MacOS
      id: macos-cache
      uses: actions/cache/restore@0400d5f644dc74513175e3cd8d07132dd4860809 # v4.2.4
      with:
        path: node_modules
        key: ${{ env.MACOS_KEY }}
        lookup-only: true
        enableCrossOsArchive: true

    - name: Check cache miss for Windows
      id: windows-cache
      uses: actions/cache/restore@0400d5f644dc74513175e3cd8d07132dd4860809 # v4.2.4
      with:
        path: node_modules
        key: ${{ env.WINDOWS_KEY }}
        lookup-only: true
        enableCrossOsArchive: true

    - name: Dispatch `node_modules` prefetch for MacOS and Windows
      id: os-matrix-prefetch
      env:
        MACOS_MISS: ${{ steps.macos-cache.outputs.cache-hit != 'true' && 'true' || '' }}
        WINDOWS_MISS: ${{ steps.windows-cache.outputs.cache-hit != 'true' && 'true' || '' }}
        PREFETCH_MAC_ONLY: '["macos-latest"]'
        PREFETCH_WINDOWS_ONLY: '["windows-latest"]'
        PREFETCH_BOTH: '["macos-latest", "windows-latest"]'
        PREFETCH_FALLBACK: '["ubuntu-latest"]'
      shell: bash
      run: |
        echo 'os-matrix-prefetch=${{
          (env.OS_MATRIX_IS_FULL && env.WINDOWS_MISS && env.MACOS_MISS && env.PREFETCH_BOTH) ||
          (env.OS_MATRIX_IS_FULL && env.MACOS_MISS && env.PREFETCH_MAC_ONLY) ||
          (env.OS_MATRIX_IS_FULL && env.WINDOWS_MISS && env.PREFETCH_WINDOWS_ONLY) ||
          env.PREFETCH_FALLBACK
        }}' >> "$GITHUB_OUTPUT"
