name: Compare JS bundle size
on:
  pull_request:
    paths:
      - 'app/javascript/**'
      - 'vite.config.mts'
      - 'package.json'
      - 'yarn.lock'
      - .github/workflows/bundlesize-compare.yml

jobs:
  build-head:
    name: 'Build head'
    runs-on: ubuntu-latest
    permissions:
      contents: read
    env:
      ANALYZE_BUNDLE_SIZE: '1'
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6

      - name: Set up Javascript environment
        uses: ./.github/actions/setup-javascript

      - name: Build
        run: yarn run build:production

      - name: Upload stats.json
        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
        with:
          name: head-stats
          path: ./stats.json
          if-no-files-found: error

  build-base:
    name: 'Build base'
    runs-on: ubuntu-latest
    permissions:
      contents: read
    env:
      ANALYZE_BUNDLE_SIZE: '1'
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
        with:
          ref: ${{ github.base_ref }}

      - name: Set up Javascript environment
        uses: ./.github/actions/setup-javascript

      - name: Build
        run: yarn run build:production

      - name: Upload stats.json
        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
        with:
          name: base-stats
          path: ./stats.json
          if-no-files-found: error

  compare:
    name: 'Compare base & head bundle sizes'
    runs-on: ubuntu-latest
    needs: [build-base, build-head]
    permissions:
      pull-requests: write
    steps:
      - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7

      - uses: twk3/rollup-size-compare-action@a1f8628fee0e40899ab2b46c1b6e14552b99281e # v1.2.0
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          current-stats-json-path: ./head-stats/stats.json
          base-stats-json-path: ./base-stats/stats.json