pr-automation.yml

name: PR Automation

on:
  pull_request:
    types: [opened, synchronize, reopened]

jobs:
  # Job 1: Auto-label based on files changed
  auto-label:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    
    steps:
    - name: Checkout code
      uses: actions/checkout@v4
    
    - name: Label based on files changed
      uses: actions/github-script@v7
      with:
        script: |
          const { data: files } = await github.rest.pulls.listFiles({
            owner: context.repo.owner,
            repo: context.repo.repo,
            pull_number: context.issue.number,
          });
          
          const labels = new Set();
          
          for (const file of files) {
            const path = file.filename;
            
            if (path.includes('.github/workflows/')) {
              labels.add('workflows');
            }
            
            if (path.startsWith('src/')) {
              labels.add('source-code');
            }
            
            if (path.includes('.test.') || path.includes('.spec.')) {
              labels.add('tests');
            }
            
            if (path.endsWith('.md')) {
              labels.add('documentation');
            }
            
            if (path === 'package.json' || path === 'package-lock.json') {
              labels.add('dependencies');
            }
            
            if (path.endsWith('.css') || path.endsWith('.scss')) {
              labels.add('styles');
            }
            
            if (path.includes('components/')) {
              labels.add('components');
            }
          }
          
          if (labels.size > 0) {
            await github.rest.issues.addLabels({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              labels: Array.from(labels)
            });
          }
  
  # Job 2: Check PR size and add size label
  size-label:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    
    steps:
    - name: Check PR size
      uses: actions/github-script@v7
      with:
        script: |
          const { data: pr } = await github.rest.pulls.get({
            owner: context.repo.owner,
            repo: context.repo.repo,
            pull_number: context.issue.number,
          });
          
          const additions = pr.additions;
          const deletions = pr.deletions;
          const totalChanges = additions + deletions;
          
          let sizeLabel = 'size/XS';
          
          if (totalChanges >= 1000) {
            sizeLabel = 'size/XL';
          } else if (totalChanges >= 500) {
            sizeLabel = 'size/L';
          } else if (totalChanges >= 200) {
            sizeLabel = 'size/M';
          } else if (totalChanges >= 50) {
            sizeLabel = 'size/S';
          }
          
          const { data: labels } = await github.rest.issues.listLabelsOnIssue({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: context.issue.number,
          });
          
          for (const label of labels) {
            if (label.name.startsWith('size/')) {
              await github.rest.issues.removeLabel({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                name: label.name
              }).catch(() => {});
            }
          }
          
          await github.rest.issues.addLabels({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: context.issue.number,
            labels: [sizeLabel]
          }).catch(() => {});
  
  # Job 3: Comment with PR statistics
  pr-stats:
    runs-on: ubuntu-latest
    needs: size-label
    permissions:
      pull-requests: write
    
    steps:
    - name: Comment PR with stats
      uses: actions/github-script@v7
      with:
        script: |
          const { data: pr } = await github.rest.pulls.get({
            owner: context.repo.owner,
            repo: context.repo.repo,
            pull_number: context.issue.number,
          });
          
          const { data: files } = await github.rest.pulls.listFiles({
            owner: context.repo.owner,
            repo: context.repo.repo,
            pull_number: context.issue.number,
          });
          
          const additions = pr.additions;
          const deletions = pr.deletions;
          const changedFiles = pr.changed_files;
          const totalChanges = additions + deletions;
          
          let size = 'XS';
          if (totalChanges >= 1000) {
            size = 'XL';
          } else if (totalChanges >= 500) {
            size = 'L';
          } else if (totalChanges >= 200) {
            size = 'M';
          } else if (totalChanges >= 50) {
            size = 'S';
          }
          
          const fileTypes = {};
          for (const file of files) {
            const ext = file.filename.split('.').pop();
            fileTypes[ext] = (fileTypes[ext] || 0) + 1;
          }
          
          const fileTypesStr = Object.entries(fileTypes)
            .sort((a, b) => b[1] - a[1])
            .slice(0, 5)
            .map(([ext, count]) => `- ${ext}: ${count} files`)
            .join('\n');
          
          let recommendation = 'Great! This PR is easy to review.';
          if (totalChanges >= 500) {
            recommendation = 'Large PR! Consider splitting into smaller PRs for easier review.';
          } else if (totalChanges >= 200) {
            recommendation = 'Medium-sized PR. Consider breaking it down if possible.';
          }
          
          const commentBody = '## PR Statistics - Size: ' + size + '\n\n' +
            '**Total Changes:** ' + totalChanges + ' lines\n\n' +
            '### Changes\n' +
            '- Additions: ' + additions + ' lines\n' +
            '- Deletions: ' + deletions + ' lines\n' +
            '- Files changed: ' + changedFiles + '\n\n' +
            '### File Types\n' +
            fileTypesStr + '\n\n' +
            '### Review Recommendations\n' +
            recommendation + '\n\n' +
            '---\n' +
            '*Automated by PR Automation*';
          
          const { data: comments } = await github.rest.issues.listComments({
            owner: context.repo.owner,
            repo: context.repo.repo,
            issue_number: context.issue.number,
          });
          
          const botComment = comments.find(comment => 
            comment.user.type === 'Bot' && 
            comment.body.includes('PR Statistics')
          );
          
          if (botComment) {
            await github.rest.issues.updateComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              comment_id: botComment.id,
              body: commentBody
            });
          } else {
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: commentBody
            });
          }