name: Next.js Bundle Analysis
on:
  pull_request:
    branches:
      - main
      - staging
  workflow_dispatch: null
defaults:
  run:
    working-directory: ./
jobs:
  analyze:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
      contents: read
    steps:
      - uses: actions/checkout@v3
      - run: echo "node_version=$(cat .github/nodejs.version)" >> $GITHUB_ENV
      - name: "use node ${{ env.node_version }}"
        uses: actions/setup-node@v3
        with:
          node-version: "${{ env.node_version }}"
      - name: Install dependencies
        run: yarn install --frozen-lockfile
      - name: Restore next build
        uses: actions/cache@v3
        id: restore-build-cache
        env:
          cache-name: cache-next-build
        with:
          path: .next/cache
          key: "${{ runner.os }}-build-${{ env.cache-name }}"
      - name: Build next.js app
        env:
          SKIP_BUILD_PRODUCT_REDIRECTS: 1
        run: yarn build
      - name: Analyze bundle
        run: npx -p nextjs-bundle-analysis report
      - name: Upload bundle
        uses: actions/upload-artifact@v3
        with:
          name: bundle
          path: .next/analyze/__bundle_analysis.json
      - name: Download base branch bundle stats
        uses: dawidd6/action-download-artifact@v2
        if: success() && github.event.number
        with:
          workflow: nextjs_bundle_analysis.yml
          branch: "${{ github.event.pull_request.base.ref }}"
          path: .next/analyze/base
      - name: Compare with base branch bundle
        if: success() && github.event.number
        run: ls -laR .next/analyze/base && npx -p nextjs-bundle-analysis compare
      - name: Get comment body
        id: get-comment-body
        if: success() && github.event.number
        uses: actions/github-script@v6
        with:
          result-encoding: string
          script: >
            const fs = require('fs')

            const comment =
            fs.readFileSync('.next/analyze/__bundle_analysis_comment.txt',
            'utf8')

            core.setOutput('body', comment)
      - name: Find Comment
        uses: peter-evans/find-comment@v2
        if: success() && github.event.number
        id: fc
        with:
          issue-number: "${{ github.event.number }}"
          body-includes: <!-- __NEXTJS_BUNDLE -->
      - name: Create Comment
        uses: peter-evans/create-or-update-comment@v2
        if: success() && github.event.number && steps.fc.outputs.comment-id == 0
        with:
          issue-number: "${{ github.event.number }}"
          body: "${{ steps.get-comment-body.outputs.body }}"
      - name: Update Comment
        uses: peter-evans/create-or-update-comment@v2
        if: success() && github.event.number && steps.fc.outputs.comment-id != 0
        with:
          issue-number: "${{ github.event.number }}"
          body: "${{ steps.get-comment-body.outputs.body }}"
          comment-id: "${{ steps.fc.outputs.comment-id }}"
          edit-mode: replace