Binary Size Comment workflow (SurgeDM/Surge)

name: Binary Size Comment
 
on:
  workflow_run:
    workflows: ["Binary Size Compare"]
    types:
      - completed
 
permissions:
  pull-requests: write
 
jobs:
  comment:
    timeout-minutes: 30
    if: >
      github.event.workflow_run.event == 'pull_request' &&
      github.event.workflow_run.conclusion == 'success'
    runs-on: latchkey-small
    steps:
      - name: Download artifact
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          gh run download ${{ github.event.workflow_run.id }} -n binary-size-data -R ${{ github.repository }} --dir .
 
      - name: Comment on PR (Create or Update)
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const prNumber = Number(fs.readFileSync('./pr_number.txt', 'utf8').trim());
            const pr = Number(fs.readFileSync('./size_pr.txt', 'utf8').trim());
            const main = Number(fs.readFileSync('./size_main.txt', 'utf8').trim());
            const diff = Number(fs.readFileSync('./diff.txt', 'utf8').trim());
            const exceeds = fs.readFileSync('./exceeds.txt', 'utf8').trim() === 'true';
 
            // Better formatter handling negative numbers correctly
            const fmt = (n) => {
              const units = ['B','KB','MB','GB'];
              let i = 0; let v = Math.abs(n);
              while (v >= 1024 && i < 3) { v /= 1024; i++; }
              return `${(n < 0 ? '-' : '')}${v.toFixed(2)} ${units[i]}`;
            };
 
            const statusLabel = exceeds ? "⚠️ **Size Increased**" : "✅ **Size Decreased or Stable**";
            
            // Hidden signature so the bot knows which comment is its own
            const signature = "<!-- binary-size-signature -->";
            
            const body = `${signature}
            ### Binary Size Analysis
            ${statusLabel}
            
            | Version | Human Readable | Raw Bytes |
            | :--- | :--- | :--- |
            | **Main** | ${fmt(main)} | \`${main}\` |
            | **PR** | ${fmt(pr)} | \`${pr}\` |
            | **Difference** | **${fmt(diff)}** | \`${diff}\` |
            `;
 
            // Look for existing comment
            const comments = await github.paginate(github.rest.issues.listComments, {
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: prNumber
            });
            
            const existingComment = comments.find(c => c.body.includes(signature));
 
            if (existingComment) {
              // Update the existing comment
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existingComment.id,
                body: body
              });
            } else if (exceeds) {
              // Only create a NEW comment if the size increased
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: prNumber,
                body: body
              });
            }