name: Post PR Report Comment
description: Reads a markdown report file and posts/updates a single idempotent comment on a PR.

inputs:
  pr-number:
    description: PR number to comment on
    required: true
  report-file:
    description: Path to the markdown report file
    required: true
  comment-marker:
    description: HTML comment marker for idempotent matching
    required: true
  token:
    description: GitHub token with pull-requests write permission
    required: true

runs:
  using: composite
  steps:
    - name: Read report
      id: report
      uses: juliangruber/read-file-action@b549046febe0fe86f8cb4f93c24e284433f9ab58 # v1.1.7
      with:
        path: ${{ inputs.report-file }}

    - name: Create or update PR comment
      uses: actions-cool/maintain-one-comment@4b2dbf086015f892dcb5e8c1106f5fccd6c1476b # v3.2.0
      with:
        token: ${{ inputs.token }}
        number: ${{ inputs.pr-number }}
        body: |
          ${{ steps.report.outputs.content }}
          ${{ inputs.comment-marker }}
        body-include: ${{ inputs.comment-marker }}