name: Check Cache

on:
  workflow_call:
    inputs:
      os:
        required: true
        type: string
      arch:
        required: false
        type: string
      compiler:
        required: false
        type: string
        default: msvc
      build-deps-only:
        required: false
        type: boolean
      force-build:
        required: false
        type: boolean
  
# Read by scripts/ci_deps_cache.sh.
env:
  REPO: ${{ github.repository }}
  WORKFLOW_REF: ${{ github.workflow_ref }}
  BASE_REF: ${{ github.base_ref }}

jobs:
  check_cache: # determines if there is a cache and outputs variables used in caching process
    name: Check Cache
    # Hosted macOS runners are scarce, so their lookup runs on Linux.
    runs-on: ${{ startsWith(inputs.os, 'macos-') && 'ubuntu-24.04' || inputs.os }}
    outputs:
      cache-key: ${{ steps.set_outputs.outputs.cache-key }}
      cache-path: ${{ steps.set_outputs.outputs.cache-path }}
      valid-cache: ${{ steps.cache_deps.outputs.cache-hit }}
      macos-path: ${{ steps.macos_path.outputs.path }}
      key-inputs: ${{ steps.wait_check.outputs.key-inputs }}
      wait-for: ${{ steps.wait_check.outputs.wait-for }}
      wait-since: ${{ steps.wait_check.outputs.wait-since }}
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          lfs: 'false'
          # The wait check compares the merge commit with its first parent.
          fetch-depth: ${{ startsWith(inputs.os, 'macos-') && 2 || 1 }}
          # Fetches only deps/, which the key hashes, and the wait script.
          sparse-checkout: |
            /deps/
            /scripts/ci_deps_cache.sh
          sparse-checkout-cone-mode: false
        
      - name: set outputs
        id: set_outputs
        env:
          # Anything that changes how the tree is built belongs in the key, or a job
          # restores one it cannot use. Linux amd64 passes no arch deliberately, so
          # 'linux-clang' keeps the cache it already has.
          cache-os: ${{ (runner.os == 'macOS' || startsWith(inputs.os, 'macos-')) && format('{0}-{1}', inputs.os, inputs.arch) || (runner.os == 'Windows' && format('windows-{0}-{1}', inputs.arch, inputs.compiler) || format('linux-clang{0}', inputs.arch && format('-{0}', inputs.arch) || '')) }}
          # The Windows ARM64 deps build in build-arm64, all others under build;
          # build_deps.yml and build_orca.yml pass the Windows directory to build_win.bat.
          dep-folder-name: ${{ (runner.os == 'macOS' || startsWith(inputs.os, 'macos-')) && format('/{0}', inputs.arch) || (runner.os == 'Windows' && inputs.arch == 'arm64') && '-arm64/OrcaSlicer_dep' || '/OrcaSlicer_dep' }}
          output-cmd: ${{ runner.os == 'Windows' && '$env:GITHUB_OUTPUT' || '"$GITHUB_OUTPUT"'}}
        run: |
          echo cache-key=${{ env.cache-os }}-cache-orcaslicer_deps-build-${{ hashFiles('deps/**') }} >> ${{ env.output-cmd }}
          # Relative to the workspace, which differs from the build's when this job runs on Linux.
          echo cache-path=deps/build${{ env.dep-folder-name }} >> ${{ env.output-cmd }}
            
      # actions/cache matches the path too, so a Linux lookup for macOS uses the
      # workspace of a hosted macOS job.
      - name: macOS cache path
        id: macos_path
        if: ${{ startsWith(inputs.os, 'macos-') }}
        run: echo "path=/Users/runner/work/${GITHUB_REPOSITORY#*/}/${GITHUB_REPOSITORY#*/}/${{ steps.set_outputs.outputs.cache-path }}" >> "$GITHUB_OUTPUT"

      - name: load cache
        id: cache_deps
        uses: actions/cache@v6
        with:
          path: ${{ steps.macos_path.outputs.path || format('{0}/{1}', github.workspace, steps.set_outputs.outputs.cache-path) }}
          key: ${{ steps.set_outputs.outputs.cache-key }}
          lookup-only: true
        
      # A pull request that misses the cache can wait for a base branch build of the same deps.
      - name: check for a base branch build to wait for
        id: wait_check
        if: ${{ startsWith(inputs.os, 'macos-') && github.event_name == 'pull_request' && steps.cache_deps.outputs.cache-hit != 'true' }}
        env:
          GH_TOKEN: ${{ github.token }}
        run: bash scripts/ci_deps_cache.sh check

  wait_for_deps:
    name: Wait for base branch deps
    needs: [check_cache]
    if: ${{ needs.check_cache.outputs.wait-for != '' }}
    runs-on: ubuntu-24.04
    env:
      WAIT_MINUTES: 120
    # Must exceed WAIT_MINUTES.
    timeout-minutes: 130
    # Waiting runs queue here, and only the first one holds a runner.
    concurrency:
      group: deps-wait-${{ github.base_ref }}-${{ needs.check_cache.outputs.cache-key }}
      queue: max
    outputs:
      hit: ${{ steps.lookup.outputs.cache-hit }}
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          sparse-checkout: scripts/ci_deps_cache.sh
          sparse-checkout-cone-mode: false

      - name: wait for the deps cache
        env:
          GH_TOKEN: ${{ github.token }}
          KEY: ${{ needs.check_cache.outputs.cache-key }}
          KEY_INPUTS: ${{ needs.check_cache.outputs.key-inputs }}
          WAIT_FOR: ${{ needs.check_cache.outputs.wait-for }}
          WAIT_SINCE: ${{ needs.check_cache.outputs.wait-since }}
          ARCH: ${{ inputs.arch }}
        run: bash scripts/ci_deps_cache.sh wait

      - name: load cache
        id: lookup
        uses: actions/cache@v6
        with:
          path: ${{ needs.check_cache.outputs.macos-path }}
          key: ${{ needs.check_cache.outputs.cache-key }}
          lookup-only: true

  build_deps: # call next step
    name: Build Deps
    needs: [check_cache, wait_for_deps]
    # A failed wait counts as no cache, so the deps are built here.
    if: ${{ !cancelled() && needs.check_cache.result == 'success' }}
    uses: ./.github/workflows/build_deps.yml
    with:
      cache-key: ${{ needs.check_cache.outputs.cache-key }}
      cache-path: ${{ needs.check_cache.outputs.cache-path }}
      valid-cache: ${{ needs.check_cache.outputs.valid-cache == 'true' || needs.wait_for_deps.outputs.hit == 'true' }}
      os: ${{ inputs.os }}
      arch: ${{ inputs.arch }}
      compiler: ${{ inputs.compiler }}
      build-deps-only: ${{ inputs.build-deps-only }}
      force-build: ${{ inputs.force-build }}
    secrets: inherit