name: Compare vcpkg install changes
description: Compares vcpkg install outputs between the base and head refs on pull requests and generates a report.

inputs:
  vcpkg-manifest-dir:
    description: 'Directory containing the vcpkg.json manifest'
    required: true
    default: '.'
    type: string
  triplet:
    description: 'Triplet to use for vcpkg installation'
    required: true
    default: 'x64-linux'
    type: string
  features:
    description: 'Comma separated list of features'
    required: false
    default: ''
    type: string

outputs:
  report:
    description: 'The report of added and removed packages after vcpkg installation comparison'
    value: ${{ steps.compare.outputs.report }}

runs:
  using: "composite"
  steps:
    # Run vcpkg install --dry-run on the head ref
    - name: Run vcpkg install (HEAD)
      shell: bash
      run: |
        vcpkg install --dry-run --triplet ${{ inputs.triplet }} --x-manifest-root=${{ inputs.vcpkg-manifest-dir }} $(awk -v FS=',' '{for(i=1; i<=NF; i++) printf "--x-feature=%s ", $i}' <<< "${{ inputs.features }}") --allow-unsupported > /tmp/vcpkg-head-output.txt

    # Run vcpkg install --dry-run on the base ref
    - name: Run vcpkg install (BASE)
      shell: bash
      run: |
        git worktree add .base-ref ${{ github.event.pull_request.base.sha }}
        vcpkg install --dry-run --triplet ${{ inputs.triplet }} --x-manifest-root=.base-ref/${{ inputs.vcpkg-manifest-dir }} $(awk -v FS=',' '{for(i=1; i<=NF; i++) printf "--x-feature=%s ", $i}' <<< "${{ inputs.features }}")  --allow-unsupported > /tmp/vcpkg-base-output.txt


    # Compare the outputs and generate a report
    - name: Compare vcpkg outputs
      shell: bash
      id: compare
      run: |
        python3 ${GITHUB_ACTION_PATH}/vcpkg-diff.py > /tmp/vcpkg-report.txt
        cat /tmp/vcpkg-report.txt
        {
          echo 'report<<EOF'
          cat /tmp/vcpkg-report.txt
          echo EOF
        } >> "$GITHUB_OUTPUT"