name: CI

on:
  push:
    branches: [main]
  pull_request:
    branches: [main]

jobs:
  commitlint:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'
          
      - name: Install dependencies
        run: npm ci
        
      - name: Validate current commit
        if: github.event_name == 'push'
        run: npx commitlint --from HEAD~1 --to HEAD --verbose
        
      - name: Validate PR commits
        if: github.event_name == 'pull_request'
        run: npx commitlint --from ${{ github.event.pull_request.base.sha }} --to ${{ github.event.pull_request.head.sha }} --verbose

  frontend:
    runs-on: ubuntu-latest
    
    strategy:
      matrix:
        node-version: [18.x, 20.x]
    
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        
      - name: Setup Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'npm'
          
      - name: Install dependencies
        run: npm ci
        
      - name: Lint
        run: npm run lint
        
      - name: Unit Tests
        run: npm run test:run
        
      - name: Build
        run: npm run build
        
      - name: Upload build artifacts
        uses: actions/upload-artifact@v4
        with:
          name: dist-${{ matrix.node-version }}
          path: dist/
          retention-days: 7

  backend:
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20.x'
          
      - name: Install dependencies
        working-directory: ./backend
        run: npm ci
        
      - name: Test
        working-directory: ./backend
        run: npm test

  integration:
    runs-on: ubuntu-latest
    needs: [frontend, backend, commitlint]
    
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20.x'
          cache: 'npm'
          
      - name: Install dependencies
        run: npm ci
        
      - name: Run Integration Tests
        run: npm run test:integration

  e2e:
    runs-on: ubuntu-latest
    needs: [frontend, backend, commitlint]
    
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20.x'
          cache: 'npm'
          
      - name: Install dependencies
        run: npm ci
        
      - name: Install Playwright browsers
        run: npx playwright install --with-deps chromium
        
      - name: Run E2E Tests
        run: npm run test:e2e
        
      - name: Upload Playwright report
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: playwright-report
          path: playwright-report/
          retention-days: 7

  regression:
    runs-on: ubuntu-latest
    needs: [frontend, backend, commitlint]
    
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20.x'
          cache: 'npm'
          
      - name: Install dependencies
        run: npm ci
        
      - name: Run Regression Tests
        run: npm run test:regression
        
      - name: Upload snapshot diffs
        uses: actions/upload-artifact@v4
        if: failure()
        with:
          name: snapshot-diffs
          path: tests/regression/**/__diff_output__/
          retention-days: 7

  lighthouse:
    runs-on: ubuntu-latest
    needs: [frontend]
    
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20.x'
          cache: 'npm'
          
      - name: Install dependencies
        run: npm ci
        
      - name: Build
        run: npm run build
        
      - name: Run Lighthouse CI
        run: npm run test:lighthouse
        continue-on-error: true