on:
  workflow_call:
    inputs:
      ref:
        description: "The target branch's ref"
        required: true
        type: string
    outputs:
      version: 
        description: "The expected Go version"
        value: ${{ jobs.extract.outputs.version }}

jobs:
  extract:
      runs-on: ubuntu-latest
      outputs:
        version: ${{ steps.pick-version.outputs.version }}
      steps:
        - name: Check out the code
          uses: actions/checkout@v5

        - id: pick-version
          run: |
            if [ "${{ inputs.ref }}" == "main" ]; then
              version=$(grep '^go ' go.mod | awk '{print $2}' | cut -d. -f1-2)
            else
              goDirectiveVersion=$(grep '^go ' go.mod | awk '{print $2}')
              toolChainVersion=$(grep '^toolchain ' go.mod | awk '{print $2}')
              version=$(printf "%s\n%s\n" "$goDirectiveVersion" "$toolChainVersion" | sort -V | tail -n1)
            fi

            echo "version=$version"
            echo "version=$version" >> $GITHUB_OUTPUT