name: 'Setup split-tests'
description: 'Setup the environment for splitting tests'

inputs:
  results_path:
    description: 'Glob pattern to the JUnit files to save'
    required: true

runs:
  using: composite
  steps:
    - name: Setup split_tests binary
      run: |
        curl --no-progress-meter -L https://github.com/leonid-shevtsov/split_tests/releases/download/v0.3.0/split_tests.linux.gz | gunzip -c > split_tests
        chmod +x split_tests
      shell: bash

    - name: Generate an unique random value
      run: echo dummy_random_value=$RANDOM >> $GITHUB_ENV
      shell: bash

    # Restore previous runs timing from the cache.
    #
    # NB: at the end of the job, the `actions/cache@v2` action will attempt
    # to save the results back to the same key. However at this stage only
    # tests results for a single instance will be available.
    #
    # To avoid the cache being overwritten with this single result, we define
    # a random cache key, which the action will use to save the single-instance
    # report to a dummy location.
    #
    # The actual retrieval uses the `restore-keys` instead.
    - name: Restore previous runs timings
      uses: actions/cache@v2
      with:
        path: ${{ inputs.results_path }}
        key: single-instance-report-${{ github.sha }}-${{ env.dummy_random_value }}
        restore-keys: |
          tests-reports-${{ github.ref }}-${{ github.sha }}-${{ github.run_id }}
          tests-reports-${{ github.ref }}-${{ github.sha }}-
          tests-reports-${{ github.ref }}-
          tests-reports-

    - name: Display previous runs timings used for splitting tests
      run: ls ${{ inputs.results_path }} || true
      shell: bash