name: CI

on:
  push:
    branches:
      - main
    paths:
      - 'action.yml'
      - '.github/**'
  pull_request:
    paths:
      - 'action.yml'
      - '.github/**'

jobs:
  generate-key:
    runs-on: ubuntu-latest
    outputs:
      cache-name: ${{ steps.name.outputs.cache-name }}
    steps:
    - name: Generate random file
      shell: 'julia --color=yes {0}'
      run: 'write("random.txt", string(rand(10)))'
    - name: Set cache-name as output
      id: name
      run: echo "::set-output name=cache-name::${{ hashFiles('random.txt') }}"

  test-save:
    needs: generate-key
    strategy:
      matrix:
        os: [ubuntu-latest, windows-latest, macOS-latest]
      fail-fast: false
    runs-on: ${{ matrix.os }}
    steps:
    - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
    - name: Save cache
      id: cache
      uses: ./
      with:
        cache-name: ${{ needs.generate-key.outputs.cache-name }}
    - name: Check no artifacts dir
      shell: 'julia --color=yes {0}'
      run: |
        dir = joinpath(first(DEPOT_PATH), "artifacts")
        @assert !isdir(dir)
    - name: Install a small binary
      shell: 'julia --color=yes {0}'
      run: 'using Pkg; Pkg.add("pandoc_jll")'

  test-restore:
    needs: [generate-key, test-save]
    strategy:
      matrix:
        os: [ubuntu-latest, windows-latest, macOS-latest]
      fail-fast: false
    runs-on: ${{ matrix.os }}
    steps:
    - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
    - name: Restore cache
      id: cache
      uses: ./
      with:
        cache-name: ${{ needs.generate-key.outputs.cache-name }}
    - name: Test cache-hit output
      shell: 'julia --color=yes {0}'
      run: |
        @show ENV["cache-hit"]
        @assert ENV["cache-hit"] == "true"
      env:
        cache-hit: ${{ steps.cache.outputs.cache-hit }}
    - name: Check non-empty artifacts and packages dir
      shell: 'julia --color=yes {0}'
      run: |
        artifacts_dir = joinpath(first(DEPOT_PATH), "artifacts")
        @assert !isempty(readdir(artifacts_dir))
        packages_dir = joinpath(first(DEPOT_PATH), "packages")
        @assert !isempty(readdir(packages_dir))