name: Coverage Report

on:
  push:
    branches: [main]

jobs:
  report:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

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

      - name: Install dependencies
        run: npm ci

      - name: Generate coverage
        run: |
          npm run test:unit -- --coverage
          node scripts/coverage-trend.js > coverage-metrics.json

      - name: Upload metrics
        uses: actions/upload-artifact@v4
        with:
          name: coverage-metrics
          path: coverage-metrics.json

      - name: Comment coverage on PR
        if: github.event_name == 'pull_request'
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const metrics = JSON.parse(fs.readFileSync('coverage-metrics.json', 'utf8'));
            
            const comment = `## Coverage Report
            
            - Statements: ${metrics.statements}%
            - Branches: ${metrics.branches}%
            - Functions: ${metrics.functions}%
            - Lines: ${metrics.lines}%
            
            Generated at: ${metrics.timestamp}`;
            
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: comment
            });
          github-token: ${{ secrets.GITHUB_TOKEN }}