learning-room-pr-bot.yml

name: Learning Room PR Bot
# Automated validation and feedback for student pull requests

on:
  pull_request:
    types: [opened, edited, synchronize, reopened]
    paths:
      - 'learning-room/**'
  pull_request_review:
    types: [submitted]
  issue_comment:
    types: [created]

permissions:
  contents: read
  pull-requests: write
  issues: write
  statuses: write

jobs:
  welcome-first-timer:
    name: Welcome First-Time Contributors
    runs-on: ubuntu-latest
    if: github.event_name == 'pull_request' && github.event.action == 'opened'
    
    steps:
      - name: Check if first-time contributor
        uses: actions/github-script@v7
        with:
          script: |
            try {
              const { data: prs } = await github.rest.pulls.list({
                owner: context.repo.owner,
                repo: context.repo.repo,
                state: 'all',
                creator: context.payload.pull_request.user.login
              });
              
              const isFirstPR = prs.length === 1;
              
              if (isFirstPR) {
                const welcomeBody = [
                  '## Welcome to Your First Pull Request!',
                  '',
                  'Hi @' + context.payload.pull_request.user.login + '! This is your first PR in this repository. Congratulations on taking this important step in your open source journey!',
                  '',
                  '### What Happens Next',
                  '',
                  '1. **Automated Checks** \u2014 This bot will validate your PR (see checks below)',
                  '2. **Peer Review** \u2014 A facilitator or peer will review your changes',
                  '3. **Feedback** \u2014 You may receive suggestions for improvements',
                  '4. **Merge** \u2014 Once approved, your changes become part of the project',
                  '',
                  '### While You Wait',
                  '',
                  '- Check the automated validation report below',
                  '- Review the [PR guidelines](../../docs/05-working-with-pull-requests.md)',
                  '- Look at other open PRs to learn from examples',
                  '',
                  '**Remember:** Every experienced contributor started exactly where you are now. Questions are welcome!',
                  '',
                  '---',
                  '*This is an automated message from the Learning Room Bot. Need help? Mention @facilitator in a comment.*'
                ].join('\n');

                await github.rest.issues.createComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: context.payload.pull_request.number,
                  body: welcomeBody
                });
                
                await github.rest.issues.addLabels({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: context.payload.pull_request.number,
                  labels: ['first-time-contributor', 'needs-review']
                });
              }
            } catch (error) {
              console.error('Error checking first-time contributor status:', error);
              // Don't fail the workflow - just log and continue
            }

  validate-pr:
    name: Validate PR Requirements
    runs-on: ubuntu-latest
    if: github.event_name == 'pull_request'
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'

      - name: Install dependencies
        run: npm ci

      - name: Run PR validation
        id: validate
        run: node .github/scripts/validate-pr.js
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          PR_TITLE: ${{ github.event.pull_request.title }}
          PR_BODY: ${{ github.event.pull_request.body }}
          PR_AUTHOR: ${{ github.event.pull_request.user.login }}
          BASE_SHA: ${{ github.event.pull_request.base.sha }}
          HEAD_SHA: ${{ github.event.pull_request.head.sha }}

      - name: Post validation results
        if: always()
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const { buildValidationReportBody } = require('./.github/scripts/validation-report.js');
            let results;
            
            try {
              if (!fs.existsSync('validation-results.json')) {
                console.log('Warning: validation-results.json not found, creating default response');
                results = {
                  passed: false,
                  required: [{
                    name: 'Validation Output',
                    passed: false,
                    message: 'Validation results file was not created. Check workflow logs for errors.'
                  }],
                  suggestions: [],
                  accessibility: [],
                  resources: []
                };
              } else {
                results = JSON.parse(fs.readFileSync('validation-results.json', 'utf8'));
              }
            } catch (error) {
              console.error('Error reading validation results:', error);
              results = {
                passed: false,
                required: [{
                  name: 'Validation System Error',
                  passed: false,
                  message: `Error reading validation results: ${error.message}`
                }],
                suggestions: [],
                accessibility: [],
                resources: []
              };
            }

            const body = buildValidationReportBody(results);
            
            // Find and update existing bot comment, or create new one
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number
            });
            
            const botComment = comments.find(comment => 
              comment.user.type === 'Bot' && 
              comment.body.includes('PR Validation Report')
            );
            
            if (botComment) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: botComment.id,
                body: body
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.payload.pull_request.number,
                body: body
              });
            }
            
            // Apply labels
            const labels = ['documentation'];
            if (!results.passed) {
              labels.push('needs-work');
            }
            if (results.accessibility.some(a => a.type === 'error')) {
              labels.push('accessibility');
            }
            
            await github.rest.issues.addLabels({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              labels: labels
            });

      - name: Set status check
        if: always()
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            if (!fs.existsSync('validation-results.json')) {
              console.log('validation-results.json not found, skipping status check');
              return;
            }
            const results = JSON.parse(fs.readFileSync('validation-results.json', 'utf8'));
            
            const state = results.passed ? 'success' : 'failure';
            const description = results.passed 
              ? 'All validation checks passed!' 
              : 'Some validation checks need attention';
            
            await github.rest.repos.createCommitStatus({
              owner: context.repo.owner,
              repo: context.repo.repo,
              sha: context.payload.pull_request.head.sha,
              state: state,
              target_url: `https://github.com/${context.repo.owner}/${context.repo.repo}/pull/${context.payload.pull_request.number}#issuecomment`,
              description: description,
              context: 'Learning Room Bot / Validation'
            });

  celebrate-review:
    name: Celebrate Peer Review
    runs-on: ubuntu-latest
    if: github.event_name == 'pull_request_review' && github.event.review.state == 'approved'
    
    steps:
      - name: Congratulate reviewer
        uses: actions/github-script@v7
        with:
          script: |
            const reviewBody = [
              '## Peer Review Complete!',
              '',
              'Great work, @' + context.payload.review.user.login + '! You\'ve completed a peer review.',
              '',
              '**Why this matters:** Code review is one of the most valuable skills in open source. You\'re helping ensure quality, sharing knowledge, and building community trust.',
              '',
              '@' + context.payload.pull_request.user.login + ' \u2014 your PR has been approved! A facilitator will merge it soon.',
              '',
              '---',
              '*Learning Room Bot celebrates your collaboration*'
            ].join('\n');

            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              body: reviewBody
            });

  respond-to-questions:
    name: Respond to Common Questions
    runs-on: ubuntu-latest
    if: github.event_name == 'issue_comment' && github.event.issue.pull_request
    
    steps:
      - name: Auto-respond to keywords
        uses: actions/github-script@v7
        with:
          script: |
            const { getAutoResponse } = require('./.github/scripts/comment-responder.js');
            const comment = context.payload.comment.body.toLowerCase();
            const author = context.payload.comment.user.login;
            
            // Don't respond to bots
            if (context.payload.comment.user.type === 'Bot') return;
            
            const response = getAutoResponse(comment, author);
            
            if (response) {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.payload.issue.number,
                body: response + '\n\n---\n*Auto-response from Learning Room Bot*'
              });
            }