name: CI

on:
  push:
    branches: [ master ]
  pull_request:
    branches: [ master ]
  pull_request_target:
    branches: [ master ]
    types: [ labeled ] # 'test screenshots' label on PRs from fork

jobs:
  test:
    runs-on: ubuntu-latest
    if: |
      github.event_name != 'pull_request_target' &&
      !contains(toJSON(github.event.commits.*.message), '[skip ci]') &&
      !contains(toJSON(github.event.commits.*.message), '[ci skip]')

    steps:
    - uses: actions/checkout@v2
      with:
        submodules: recursive
        persist-credentials: false # minimize exposure and prevent accidental pushes

    - name: Use Node.js 12.x
      uses: actions/setup-node@v1
      with:
        node-version: '12'

    - name: Cache dependencies
      uses: actions/cache@v2
      with:
        path: |
          .yarn/cache
          .pnp.js
        key: yarn-deps-v1-${{ hashFiles('yarn.lock') }}
        restore-keys: |
          yarn-deps-v1-

    - name: Install dependencies
      run: yarn --immutable
      env:
        YARN_ENABLE_SCRIPTS: 0 # disable postinstall scripts

    - name: Lint code
      run: yarn test:lint

    - name: Run Flow
      run: yarn test:flow
      if: always()

    - name: Run Jest tests
      run: yarn test:jest --coverage
      if: always()

    - uses: codecov/codecov-action@v1
      with:
        directory: ./coverage/

  screenshotter_dispatcher:
    runs-on: ubuntu-latest
    if: |
      (github.event_name != 'pull_request_target' ||
        (github.event.pull_request.head.repo.full_name != 'KaTeX/KaTeX' &&
          contains(github.event.pull_request.labels.*.name, 'test screenshots'))) &&
      !contains(toJSON(github.event.commits.*.message), '[skip ci]') &&
      !contains(toJSON(github.event.commits.*.message), '[ci skip]')
    outputs:
      matrix: ${{ steps.set-matrix.outputs.result }}

    steps:
    - id: set-matrix
      uses: actions/github-script@v3
      with:
        github-token: ${{ secrets.GITHUB_TOKEN }}
        script: |
          const SELENIUM_BROWSERS = ["chrome:3.141.59-20200525", "firefox:3.141.59-20200525"];
          const BROWSERSTACK_BROWSERS = [{
              browserName: "safari",
              browser_version: "13.1",
              os: "OS X",
              os_version: "Catalina",
          }];

          const include = [];

          // running selenium doesn't require access to secrets
          if (context.eventName !== "pull_request_target") {
              include.push(...SELENIUM_BROWSERS.map(browserTag => ({
                  browser: browserTag.split(':')[0],
                  services: {selenium: {
                      image: `selenium/standalone-${browserTag}`,
                      ports: ["4444:4444"],
                  }},
              })));
          }

          // check access to Browserstack crendential secrets
          if (context.eventName !== "pull_request" ||
                  context.payload.pull_request.head.repo.full_name === "KaTeX/KaTeX") {
              if (context.eventName === "pull_request_target") {
                  github.issues.removeLabel({
                      issue_number: context.issue.number,
                      owner: context.repo.owner,
                      repo: context.repo.repo,
                      name: "test screenshots",
                  });
              }
              include.push(...BROWSERSTACK_BROWSERS.map(capabilities => ({
                  browser: capabilities.browserName,
                  services: {},
                  browserstack: capabilities,
              })));
          }

          return {browser: include.map(b => b.browser), include};

  screenshotter:
    runs-on: ubuntu-latest
    needs: screenshotter_dispatcher
    strategy:
      matrix: ${{ fromJson(needs.screenshotter_dispatcher.outputs.matrix) }}
      fail-fast: false
    services: ${{ matrix.services }}

    steps:
    - uses: actions/checkout@v2
      if: github.event_name != 'pull_request_target'
      with:
        submodules: recursive
        persist-credentials: false # minimize exposure and prevent accidental pushes
    - uses: actions/checkout@v2
      if: github.event_name == 'pull_request_target'
      with:
        # pull_request_target is run in the context of the base repository
        # of the pull request, so the default ref is master branch and
        # ref should be manually set to the head of the PR
        ref: refs/pull/${{ github.event.pull_request.number }}/head
        submodules: recursive

    - name: Use Node.js 12.x
      uses: actions/setup-node@v1
      with:
        node-version: '12'

    - name: Cache dependencies
      uses: actions/cache@v2
      with:
        path: |
          .yarn/cache
          .pnp.js
        key: yarn-deps-v1-${{ hashFiles('yarn.lock') }}
        restore-keys: |
          yarn-deps-v1-

    - name: Install dependencies
      run: yarn --immutable
      env:
        YARN_ENABLE_SCRIPTS: 0 # disable postinstall scripts

    - name: Verify screenshots and generate diffs and new screenshots
      run: yarn node dockers/screenshotter/screenshotter.js -b ${{ matrix.browser }} --verify --diff --new -c ${{ job.services.selenium.id }}
      if: matrix.services.selenium
    - name: Verify screenshots and generate diffs and new screenshots
      run: yarn node dockers/screenshotter/screenshotter.js -b ${{ matrix.browser }} --verify --diff --new --browserstack --selenium-capabilities '${{ toJson(matrix.browserstack) }}'
      if: matrix.browserstack
      env:
        BROWSERSTACK_USER: ${{ secrets.BROWSERSTACK_USER }}
        BROWSERSTACK_ACCESS_KEY: ${{ secrets.BROWSERSTACK_ACCESS_KEY }}

    - name: Print Docker logs
      run: docker logs ${{ job.services.selenium.id }}
      if: always() && matrix.services.selenium

    - uses: actions/upload-artifact@v2
      if: failure()
      with:
        name: new-${{ matrix.browser }}
        path: test/screenshotter/new
    - uses: actions/upload-artifact@v2
      if: failure()
      with:
        name: diff-${{ matrix.browser }}
        path: test/screenshotter/diff