# If someone with reviewer access comments "/lgtm" on a pull request, add lgtm label
name: LGTM Command
on:
  issue_comment:
    types: [created]

permissions:
  contents: read

jobs:
  lgtm-command:
    permissions:
      pull-requests: write  # for peter-evans/slash-command-dispatch to create PR reaction
      issues: write        # for adding labels and comments
      contents: read       # for reading CODEOWNERS.md
    runs-on: ubuntu-latest
    # Only run for PRs, not issue comments
    if: ${{ github.event.issue.pull_request }}
    steps:
    # Checkout repo to access CODEOWNERS.md
    - name: Checkout repository
      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
      with:
        sparse-checkout: |
          CODEOWNERS.md
        persist-credentials: false

    # Generate a GitHub App installation access token
    - name: Generate token
      id: generate_token
      uses: actions/create-github-app-token@1b10c78c7865c340bc4f6099eb2f838309f1e8c3 # v3.1.1
      env:
        LGTM_APP_ID: ${{ secrets.LGTM_APP_ID }}
        LGTM_PRIVATE_KEY: ${{ secrets.LGTM_PRIVATE_KEY }}
      with:
        app-id: ${{ env.LGTM_APP_ID }}
        private-key: ${{ env.LGTM_PRIVATE_KEY }}
        owner: ${{ github.repository_owner }}

    - name: Slash Command Dispatch
      uses: peter-evans/slash-command-dispatch@9bdcd7914ec1b75590b790b844aa3b8eee7c683a # v5.0.2
      with:
        token: ${{ steps.generate_token.outputs.token }}
        reaction-token: ${{ secrets.GITHUB_TOKEN }}
        issue-type: pull-request
        commands: lgtm
        permission: none # anyone can use the command, but permissions are checked in the workflow itself.

    - name: Process LGTM Command
      if: ${{ github.event.comment.body == '/lgtm' }}
      uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v7
      with:
        github-token: ${{ steps.generate_token.outputs.token }}
        script: |
          const { default: run } = await import(`${process.env.GITHUB_WORKSPACE}/.github/scripts/lgtm-processor.js`);
          await run({ core, github, context, fs: require('fs') });