name: Format via PR Comment

on:
   issue_comment:
      types: [created]

permissions:
   contents: write
   pull-requests: write

jobs:
   format-on-comment:
      if: >
         github.event.issue.pull_request &&
         startsWith(github.event.comment.body, '/format')
      runs-on: ubuntu-latest
      steps:
         - name: Get PR Info
           id: pr
           uses: actions/github-script@v7
           with:
              script: |
                 const pr = await github.rest.pulls.get({
                   owner: context.repo.owner,
                   repo: context.repo.repo,
                   pull_number: context.payload.issue.number
                 });

                 core.setOutput("branch", pr.data.head.ref);
                 core.setOutput("repo", pr.data.head.repo.full_name);
                 core.setOutput("default_branch", pr.data.base.ref);

         - name: Checkout PR branch
           uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
           with:
              repository: ${{ steps.pr.outputs.repo }}
              ref: ${{ steps.pr.outputs.branch }}
              token: ${{ secrets.GITHUB_TOKEN }}

         - name: Set up Node.js
           uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
           with:
              node-version: 20

         - name: Install dependencies
           run: npm ci

         - name: Run Prettier format
           run: npm run format

         - name: Commit and push changes
           run: |
              git config user.name "${{ github.actor }}"
              git config user.email "${{ github.actor }}@users.noreply.github.com"

              git add .

              if git diff --cached --quiet; then
                echo "✅ No formatting changes."
              else
                git commit -s -m "style: auto-format via /format comment"
                git push origin HEAD:${{ steps.pr.outputs.branch }}
                echo "✅ Formatting committed to PR branch."
              fi