name: Lighthouse Report

on:
  pull_request_target:
    branches:
      - main

jobs:
  lighthouse-report:
    name: Lighthouse Report
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - name: Wait for the Netlify Preview
        uses: jakepartusch/wait-for-netlify-action@v1
        id: netlify
        with:
          site_name: docusaurus-2
          max_timeout: 600
      - name: Audit URLs using Lighthouse
        id: lighthouse_audit
        uses: treosh/lighthouse-ci-action@8.2.0
        with:
          urls: |
            https://deploy-preview-$PR_NUMBER--docusaurus-2.netlify.app/
          configPath: ./.github/workflows/lighthouserc.json
          uploadArtifacts: true
          temporaryPublicStorage: true
        env:
          PR_NUMBER: ${{ github.event.pull_request.number}}
      - name: Format lighthouse score
        id: format_lighthouse_score
        uses: actions/github-script@v5
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const result = ${{ steps.lighthouse_audit.outputs.manifest }}[0].summary
            const links = ${{ steps.lighthouse_audit.outputs.links }}
            const formatResult = (res) => Math.round((res * 100))
            Object.keys(result).forEach(key => result[key] = formatResult(result[key]))
            const score = res => res >= 90 ? '🟢' : res >= 50 ? '🟠' : '🔴'
            const comment = [
                `⚡️ [Lighthouse report](${Object.values(links)[0]}) for the changes in this PR:`,
                '| Category | Score |',
                '| --- | --- |',
                `| ${score(result.performance)} Performance | ${result.performance} |`,
                `| ${score(result.accessibility)} Accessibility | ${result.accessibility} |`,
                `| ${score(result['best-practices'])} Best practices | ${result['best-practices']} |`,
                `| ${score(result.seo)} SEO | ${result.seo} |`,
                `| ${score(result.pwa)} PWA | ${result.pwa} |`,
                ' ',
                `*Lighthouse ran on [${Object.keys(links)[0]}](${Object.keys(links)[0]})*`
            ].join('\n')
             core.setOutput("comment", comment);

      - name: Add Lighthouse stats as comment
        id: comment_to_pr
        uses: marocchino/sticky-pull-request-comment@v2.2.0
        with:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          number: ${{ github.event.pull_request.number }}
          header: lighthouse
          message: ${{ steps.format_lighthouse_score.outputs.comment }}