# Each PR will visual-regression diff that help to check code is work as expect.

name: 👀 Visual Regression Diff Build

on:
  pull_request:
    branches: [master, feature]
    types: [opened, synchronize, reopened]

# Cancel prev CI if new commit come
concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  # Prepare node modules. Reuse cache if available
  setup:
    name: prepare node_modules
    runs-on: ubuntu-latest
    steps:
      - name: checkout
        uses: actions/checkout@v4

      - name: cache package-lock.json
        uses: actions/cache@v4
        with:
          path: package-temp-dir
          key: lock-${{ github.sha }}

      - name: create package-lock.json
        run: npm i --package-lock-only --ignore-scripts

      - name: hack for single file
        run: |
          if [ ! -d "package-temp-dir" ]; then
            mkdir package-temp-dir
          fi
          cp package-lock.json package-temp-dir

      - name: cache node_modules
        id: node_modules_cache_id
        uses: actions/cache@v4
        with:
          path: node_modules
          key: node_modules-${{ hashFiles('**/package-temp-dir/package-lock.json') }}

      - name: install
        if: steps.node_modules_cache_id.outputs.cache-hit != 'true'
        run: npm ci

  ############################ Generate Snapshot ###########################
  visual-diff-snapshot:
    name: visual-diff snapshot
    strategy:
      matrix:
        shard: ['1/2', '2/2']
    runs-on: ubuntu-latest
    needs: setup
    steps:
      - name: checkout
        uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: 20

      - name: restore cache from package-lock.json
        uses: actions/cache@v4
        with:
          path: package-temp-dir
          key: lock-${{ github.sha }}

      - name: restore cache from node_modules
        uses: actions/cache@v4
        with:
          path: node_modules
          key: node_modules-${{ hashFiles('**/package-temp-dir/package-lock.json') }}

      - name: generate image snapshots
        id: test-image
        run: |
          node node_modules/puppeteer/install.mjs
          npm run version
          npm run test:image -- --shard=${{matrix.shard}}
        env:
          NODE_OPTIONS: "--max_old_space_size=4096"

      - uses: actions/upload-artifact@v4
        name: artifact snapshot
        with:
          name: snapshot-artifacts-${{ strategy.job-index }}
          path: imageSnapshots/
          retention-days: 2

  ############################### Diff Images ##############################
  visual-diff-report:
    name: visual-diff report
    runs-on: ubuntu-latest
    needs: visual-diff-snapshot
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: 20

      - name: restore cache from package-lock.json
        uses: actions/cache@v4
        with:
          path: package-temp-dir
          key: lock-${{ github.sha }}

      - name: restore cache from node_modules
        uses: actions/cache@v4
        with:
          path: node_modules
          key: node_modules-${{ hashFiles('**/package-temp-dir/package-lock.json') }}

      - uses: actions/download-artifact@v4
        with:
          pattern: snapshot-artifacts-*
          merge-multiple: true
          path: imageSnapshots/

      # Execute visual regression diff task and zip then
      # output as visualRegressionReport.tar.gz
      - name: visual regression diff
        env:
          EVENT_NUMBER: ${{ github.event.number }}
          BASE_REF: ${{ github.base_ref }}
        run: |
          npm run test:visual-regression -- --pr-id=$EVENT_NUMBER --base-ref=$BASE_REF --max-workers=2

      # Upload report in `visualRegressionReport`
      - name: upload report artifact
        uses: actions/upload-artifact@v4
        if: ${{ always() }}
        with:
          name: visual-regression-report
          path: visualRegressionReport.tar.gz

      # Upload git ref for next workflow `visual-regression-diff-finish` use
      - name: Save persist key
        if: ${{ always() }}
        # should be pr id
        run: echo ${{ github.event.number }} > ./visual-regression-pr-id.txt

      - name: Upload persist key
        if: ${{ always() }}
        uses: actions/upload-artifact@v4
        with:
          name: visual-regression-diff-ref
          path: ./visual-regression-pr-id.txt