name: Stub Implementation Detection

on:
  pull_request:
    branches: [ main, master, develop ]
    types: [opened, synchronize, reopened]
  push:
    branches: [ main, master, develop ]
  workflow_dispatch:
  schedule:
    - cron: '0 0 * * 1'  # Weekly on Monday

permissions:
  contents: read
  pull-requests: write
  checks: write

jobs:
  detect-stubs:
    name: Detect Stub Implementations
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: frontends/nextjs
    steps:
      - name: Checkout code
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

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

      - name: Cache npm dependencies
        uses: actions/cache@v4
        with:
          key: npm-deps-${{ runner.os }}-${{ hashFiles('**/package-lock.json') }}
          path: |
            frontends/nextjs/node_modules
            ~/.npm
          restore-keys: npm-deps-${{ runner.os }}-

      - name: Install dependencies
        run: npm install --frozen-lockfile

      - name: Generate Prisma Client
        run: npm run db:generate
        env:
          DATABASE_URL: file:./dev.db

      # Pattern-based stub detection
      - name: Detect stub patterns
        id: detect-patterns
        run: echo "skipping tools-based stub pattern detection (tools/ removed)" > stub-patterns.json
        continue-on-error: true

      # Implementation completeness analysis
      - name: Analyze implementation completeness
        id: analyze-completeness
        run: echo "skipping tools-based implementation completeness analysis (tools/ removed)" > implementation-analysis.json
        continue-on-error: true

      # Generate detailed report
      - name: Generate stub report
        id: generate-report
        run: echo "skipping tools-based stub report generation (tools/ removed)" > stub-report.md
        continue-on-error: true

      # Check for unimplemented TODOs in changed files (PR only)
      - name: Check changed files for stubs
        if: github.event_name == 'pull_request'
        id: check-changed
        run: |
          git diff origin/${{ github.base_ref }}...HEAD -- 'src/**/*.{ts,tsx}' | \
            grep -E '^\+.*(TODO|FIXME|not implemented|stub|placeholder|mock)' | \
            tee changed-stubs.txt || true
          
          STUB_COUNT=$(wc -l < changed-stubs.txt)
          echo "stub_count=$STUB_COUNT" >> $GITHUB_OUTPUT
        continue-on-error: true

      # Post PR comment with findings
      - name: Post stub detection comment
        if: github.event_name == 'pull_request'
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            
            let comment = '## 🔍 Stub Implementation Detection Report\n\n';
            
            try {
              const patternData = JSON.parse(fs.readFileSync('stub-patterns.json', 'utf8'));
              const completenessData = JSON.parse(fs.readFileSync('implementation-analysis.json', 'utf8'));
              
              // Summary table
              comment += '### Summary\n\n';
              comment += `**Pattern-Based Stubs**: ${patternData.totalStubsFound}\n`;
              comment += `**Low Completeness Items**: ${completenessData.bySeverity.high + completenessData.bySeverity.medium}\n`;
              comment += `**Average Completeness**: ${completenessData.averageCompleteness}%\n\n`;
              
              // Severity breakdown
              if (patternData.totalStubsFound > 0) {
                comment += '### Severity Breakdown (Patterns)\n\n';
                comment += `| Severity | Count |\n`;
                comment += `|----------|-------|\n`;
                comment += `| 🔴 Critical | ${patternData.bySeverity.high} |\n`;
                comment += `| 🟠 Medium | ${patternData.bySeverity.medium} |\n`;
                comment += `| 🟡 Low | ${patternData.bySeverity.low} |\n\n`;
              }
              
              // Type breakdown
              if (Object.values(patternData.byType).some(v => v > 0)) {
                comment += '### Issue Types\n\n';
                for (const [type, count] of Object.entries(patternData.byType)) {
                  if (count > 0) {
                    comment += `- **${type}**: ${count}\n`;
                  }
                }
                comment += '\n';
              }
              
              // Critical issues
              if (patternData.criticalIssues && patternData.criticalIssues.length > 0) {
                comment += '### 🔴 Critical Issues Found\n\n';
                comment += '<details><summary>Click to expand</summary>\n\n';
                comment += `| File | Line | Function | Type |\n`;
                comment += `|------|------|----------|------|\n`;
                patternData.criticalIssues.slice(0, 10).forEach(issue => {
                  comment += `| ${issue.file} | ${issue.line} | \`${issue.function}\` | ${issue.type} |\n`;
                });
                comment += '\n</details>\n\n';
              }
              
              // Recommendations
              comment += '### 📋 Recommendations\n\n';
              comment += '- [ ] Review all critical stubs before merging\n';
              comment += '- [ ] Replace TODO comments with GitHub issues\n';
              comment += '- [ ] Implement placeholder functions before production\n';
              comment += '- [ ] Run `npm run test:check-functions` to ensure coverage\n';
              comment += '- [ ] Use type system to force implementation (avoid `any` types)\n\n';
              
              // Artifacts info
              comment += '### 📁 Detailed Reports\n\n';
              comment += 'Full analysis available in artifacts:\n';
              comment += '- `stub-patterns.json` - Pattern-based detection results\n';
              comment += '- `implementation-analysis.json` - Completeness scoring\n';
              comment += '- `stub-report.md` - Detailed markdown report\n';
            } catch (e) {
              comment += '⚠️ Could not generate detailed report. Check logs for errors.\n';
            }
            
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: comment
            });

      # Upload detailed reports
      - name: Upload stub detection reports
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: stub-detection-reports
          path: |
            stub-patterns.json
            implementation-analysis.json
            stub-report.md
            changed-stubs.txt
          retention-days: 30

      # Create check run with summary
      - name: Create check run
        uses: actions/github-script@v7
        if: always()
        with:
          script: |
            const fs = require('fs');
            
            let summary = '';
            try {
              const data = JSON.parse(fs.readFileSync('stub-patterns.json', 'utf8'));
              summary = `Found ${data.totalStubsFound} stub implementations (${data.bySeverity.high} high severity)`;
            } catch (e) {
              summary = 'Stub detection completed. See artifacts for details.';
            }
            
            github.rest.checks.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              name: 'Stub Implementation Detection',
              head_sha: context.sha,
              status: 'completed',
              conclusion: 'neutral',
              summary: summary
            });