name: Validate cache
on:
  push:
    branches:
      - main
      - releases/*
    paths-ignore:
      - '**.md'
  pull_request:
    paths-ignore:
      - '**.md'

defaults:
  run:
    shell: bash

jobs:
  save:
    runs-on: ${{ matrix.os }}
    strategy:
      fail-fast: false
      matrix:
        os: [macos-latest, windows-latest, ubuntu-latest]
    steps:
      - name: Checkout
        uses: actions/checkout@v2
      - name: Run setup-java with the cache for gradle
        uses: ./
        id: setup-java
        with:
          distribution: 'adopt'
          java-version: '11'
          cache: gradle
      - name: Create files to cache
        run: |
          cat <<EOF > build.gradle
            plugins { id 'java' }
            repositories { mavenCentral() }
            dependencies { implementation 'org.codehaus.groovy:groovy:1.8.6' }
            tasks.register('downloadDependencies') { doLast {
              def total = configurations.compileClasspath.inject (0) { sum, file ->
                sum + file.length()
              }
              println total
            }}
          EOF
          gradle downloadDependencies
          if [ ! -d ~/.gradle/caches ]; then
            echo "::error::The ~/.gradle/caches directory does not exist unexpectedly"
            exit 1
          fi
  restore:
    runs-on: ubuntu-latest
    needs: save
    steps:
      - name: Checkout
        uses: actions/checkout@v2
      - name: Create build.gradle
        run: |
          cat <<EOF > build.gradle
            plugins { id 'java' }
            repositories { mavenCentral() }
            dependencies { implementation 'org.codehaus.groovy:groovy:1.8.6' }
            tasks.register('downloadDependencies') { doLast {
              def total = configurations.compileClasspath.inject (0) { sum, file ->
                sum + file.length()
              }
              println total
            }}
          EOF
          if [ -d ~/.gradle/caches ]; then
            echo "::error::The ~/.gradle/caches directory exists unexpectedly"
            exit 1
          fi
      - name: Run setup-java with the cache for gradle
        uses: ./
        id: setup-java
        with:
          distribution: 'adopt'
          java-version: '11'
          cache: gradle
      - name: Confirm that ~/.gradle/caches directory has been made
        run: |
          if [ ! -d ~/.gradle/caches ]; then
            echo "::error::The ~/.gradle/caches directory does not exist unexpectedly"
            exit 1
          fi
          ls ~/.gradle/caches/