name: Setup Bazel
description: Setup a Bazel environment for Protobuf CI testing
inputs:
  credentials-file:
    required: true
    description: The GCP credentials file to use for caching
    type: string
  bazel-cache:
    required: true
    description: A unique path for the Bazel cache.
    type: string

outputs:
  bazel-flags:
    description: Bazel flags that should be sent to all Bazel invocations
    value: ${{ steps.output.outputs.bazel-flags }}
  bazel-startup-flags:
    description: Bazel startup flags that should be sent to all Bazel invocations
    value: ${{ steps.output.outputs.bazel-startup-flags }}

runs:
  using: 'composite'
  steps:
    - name: Initialize BAZEL environment variable
      shell: bash
      run: echo "BAZEL=bazelisk" >> $GITHUB_ENV

    - name: Initialize Windows startup flags
      if: runner.os == 'Windows'
      shell: bash
      run: echo "BAZEL_STARTUP_FLAGS=--output_user_root=C:/tmp --windows_enable_symlinks" >> $GITHUB_ENV

    - name: Initialize Bazel flags
      shell: bash
      run: echo "BAZEL_FLAGS=--keep_going --test_output=errors --test_timeout=600" >> $GITHUB_ENV

    - name: Initialize Windows-specific Bazel flags
      if: runner.os == 'Windows'
      shell: bash
      run: echo "BAZEL_FLAGS=$BAZEL_FLAGS --enable_runfiles" >> $GITHUB_ENV

    - name: Initialize MacOS-specific Bazel flags
      if: runner.os == 'macOS'
      shell: bash
      run: |
        echo "BAZEL_FLAGS=$BAZEL_FLAGS --xcode_version_config=//.github:host_xcodes" >> $GITHUB_ENV
        echo "DEVELOPER_DIR=${{ env.DEVELOPER_DIR || '/Applications/Xcode_14.1.app/Contents/Developer' }}" >> $GITHUB_ENV

    - name: Configure Bazel caching
      # Skip bazel cache for local act runs due to issue with credential files
      # and nested docker images
      if: ${{ inputs.bazel-cache && !github.event.act_local_test }}
      shell: bash
      run: >-
        echo "BAZEL_FLAGS=$BAZEL_FLAGS
        --google_credentials=${{ inputs.credentials-file }}
        --remote_cache=https://storage.googleapis.com/protobuf-bazel-cache/protobuf/gha/${{ inputs.bazel-cache }}" >> $GITHUB_ENV

    - name: Configure Bazel cache writing
      # External runs should never write to our caches.
      if: ${{ github.event_name != 'pull_request_target' && inputs.bazel-cache && !github.event.act_local_test }}
      shell: bash
      run: echo "BAZEL_FLAGS=$BAZEL_FLAGS --remote_upload_local_results" >> $GITHUB_ENV

    - name: Output Bazel flags
      id: output
      shell: bash
      run: |
        echo "bazel-flags=$BAZEL_FLAGS" >> $GITHUB_OUTPUT
        echo "bazel-startup-flags=$BAZEL_STARTUP_FLAGS" >> $GITHUB_OUTPUT

    - name: Restore Bazel repository cache
      uses: ./.github/actions/internal/repository-cache-restore
      with:
        bazel-cache: ${{ inputs.bazel-cache }}