name: Visual Regression Tests

on:
  push:
    branches: [main, develop]
  pull_request:
    branches: [main, develop]
  schedule:
    # Run tests daily at 2 AM UTC
    - cron: '0 2 * * *'
  workflow_dispatch:
    inputs:
      component:
        description: 'Component to test (optional)'
        required: false
        type: string
      update_snapshots:
        description: 'Update snapshots'
        required: false
        type: boolean
        default: false

permissions:
  contents: read
  pull-requests: write

jobs:
  visual-tests:
    timeout-minutes: 60
    runs-on: ubuntu-latest

    strategy:
      fail-fast: false
      matrix:
        # Test on multiple browsers
        browser: [chromium, firefox, webkit]
        # Test on multiple viewports
        viewport: [desktop, tablet, mobile]

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0 # Full history for better diff analysis

      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'
          cache-dependency-path: packages/visual-testing/package-lock.json

      - name: Install dependencies
        working-directory: packages/visual-testing
        run: npm ci

      - name: Install Playwright browsers
        working-directory: packages/visual-testing
        run: npx playwright install --with-deps ${{ matrix.browser }}

      - name: Install Rust toolchain
        uses: actions-rs/toolchain@v1
        with:
          profile: minimal
          toolchain: stable
          override: true

      - name: Build Storybook
        working-directory: packages/leptos
        run: |
          npm install
          npm run build-storybook

      - name: Start Storybook
        working-directory: packages/leptos
        run: |
          npx http-server storybook-static -p 6006 &
          sleep 10

      - name: Run visual tests
        id: visual-tests
        working-directory: packages/visual-testing
        env:
          CI: true
          BROWSER: ${{ matrix.browser }}
          VIEWPORT: ${{ matrix.viewport }}
        run: |
          if [ "${{ github.event.inputs.update_snapshots }}" = "true" ]; then
            ./scripts/run-visual-tests.sh --update
          else
            ./scripts/run-visual-tests.sh
          fi

      - name: Upload test results
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: visual-test-results-${{ matrix.browser }}-${{ matrix.viewport }}
          path: packages/visual-testing/test-results/
          retention-days: 30

      - name: Upload screenshots
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: visual-screenshots-${{ matrix.browser }}-${{ matrix.viewport }}
          path: packages/visual-testing/screenshots/
          retention-days: 30

      - name: Upload Playwright report
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: playwright-report-${{ matrix.browser }}-${{ matrix.viewport }}
          path: packages/visual-testing/playwright-report/
          retention-days: 30

      - name: Comment PR with results
        if: github.event_name == 'pull_request' && matrix.browser == 'chromium' && matrix.viewport == 'desktop'
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const resultsPath = 'packages/visual-testing/test-results/results.json';

            if (fs.existsSync(resultsPath)) {
              const results = JSON.parse(fs.readFileSync(resultsPath, 'utf8'));
              const passed = results.stats?.expected || 0;
              const failed = results.stats?.unexpected || 0;
              const total = passed + failed;

              const body = `## 🎨 Visual Regression Test Results

              **Browser:** ${{ matrix.browser }}
              **Viewport:** ${{ matrix.viewport }}

              | Status | Count |
              |--------|-------|
              | ✅ Passed | ${passed} |
              | ❌ Failed | ${failed} |
              | 📊 Total | ${total} |

              ${failed > 0 ? '⚠️ Some visual tests failed. Check the artifacts for details.' : '✅ All visual tests passed!'}

              [View full report](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})
              `;

              github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: body
              });
            }

      - name: Fail if tests failed
        if: steps.visual-tests.outputs.exit_code != 0
        run: exit 1

  # Job to update snapshots if needed
  update-snapshots:
    if: github.event.inputs.update_snapshots == 'true'
    needs: visual-tests
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Download screenshots
        uses: actions/download-artifact@v4
        with:
          pattern: visual-screenshots-*
          path: packages/visual-testing/screenshots/
          merge-multiple: true

      - name: Commit updated snapshots
        run: |
          git config --local user.email "github-actions[bot]@users.noreply.github.com"
          git config --local user.name "github-actions[bot]"
          git add packages/visual-testing/screenshots/baseline/
          git diff --staged --quiet || git commit -m "chore: update visual test snapshots [skip ci]"
          git push

  # Summary job
  summary:
    if: always()
    needs: visual-tests
    runs-on: ubuntu-latest

    steps:
      - name: Download all results
        uses: actions/download-artifact@v4
        with:
          path: all-results/

      - name: Generate summary
        run: |
          echo "# 🎨 Visual Regression Test Summary" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "## Test Results" >> $GITHUB_STEP_SUMMARY
          echo "- ✅ Total test suites: ${{ needs.visual-tests.result }}" >> $GITHUB_STEP_SUMMARY
          echo "- 📊 Browsers tested: chromium, firefox, webkit" >> $GITHUB_STEP_SUMMARY
          echo "- 📱 Viewports tested: desktop, tablet, mobile" >> $GITHUB_STEP_SUMMARY