# This is more or less a copy of
# https://github.com/mdn/content/blob/main/.github/workflows/pr-test.yml
# but done in a way that it first checks out mdn/translated-content (or
# fork of) and _then_ checks out mdn/content which has the relevant
# CI related tooling.

name: PR Test

on:
  pull_request:
    branches:
      - main

jobs:
  tests:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
        # Needed otherswise it will check out a merge commit which means
        # you can't get a `git diff` for this PR compared to its base.
        # with:
        #   ref: ${{ github.event.pull_request.head.sha }}

      - uses: actions/checkout@v3
        with:
          repository: mdn/content
          path: mdn/content

      - name: Setup Node.js environment
        uses: actions/setup-node@v3
        with:
          node-version: "12"

      - name: Cache node_modules
        uses: actions/cache@v2.1.6
        id: cached-node_modules
        with:
          path: |
            ${{ github.workspace }}/mdn/content/node_modules
          key: ${{ runner.os }}-${{ hashFiles('**/yarn.lock') }}

      - name: Install all yarn packages
        if: steps.cached-node_modules.outputs.cache-hit != 'true'
        working-directory: ${{ github.workspace }}/mdn/content
        run: |
          yarn --frozen-lockfile

      - name: Config git core.quotePath
        run: |
          # If you don't do this, the get-diff-action won't be able to
          # notice files that contain non-ascii characters.
          # I.e.
          #
          #    ▶ git status
          #    Changes not staged for commit:
          #    ...
          #   modified:   "files/en-us/glossary/b\303\251zier_curve/index.html"
          #
          # But after you set `core.quotePath` you get:
          #
          #    ▶ git status
          #    Changes not staged for commit:
          #    ...
          #   modified:   "files/en-us/glossary/bézier_curve/index.html"
          #
          # Now, this gets used by the `git diff ...` inside get-diff-action.
          git config --global core.quotePath false

      - uses: technote-space/get-diff-action@v6.0.1
        id: git_diff_content
        with:
          PATTERNS: files/**/*.+(html|md)
          SET_ENV_NAME: GIT_DIFF_CONTENT

      - name: Build changed content
        if: ${{ env.GIT_DIFF_CONTENT }}
        env:
          CONTENT_ROOT: ${{ github.workspace }}/mdn/content/files
          CONTENT_TRANSLATED_ROOT: ${{ github.workspace }}/files

          # This is so that if there's a single 'unsafe_html' flaw, it
          # completely fails the build.
          # But all other flaws should be 'warn' so that we can include
          # information about the flaws when we analyze the built PR.
          BUILD_FLAW_LEVELS: "unsafe_html: error, *:warn"

          # Because we build these pages in a way that you get a toolbar,
          # so the flaws can be displayed, but we don't want any of the
          # other toolbar features like "Fix fixable flaws" or "Quick-edit"
          # we set this to disable that stuff.
          REACT_APP_CRUD_MODE_READONLY: true

          # Setting this to an empty string effectively means that the
          # <iframe> src will end up being the relative URL of the current
          # document as a base.
          # I.e. like this, if the current document is '/en-US/docs/Foo':
          #  <iframe src="/en-US/docs/Foo/_samples_/index.html">
          # ...for example.
          # Yes, it's potentially "insecure" because the iframe will execute
          # whatever code is inserted into the code example. But since the
          # whole (possible) domain for PR builds will never be somewhere
          # where there are interesting cookies, it's a safe choice.
          BUILD_LIVE_SAMPLES_BASE_URL: ""

          # In these builds we never care for or need the ability to sign in.
          # This environment variable will disable that functionality entirely.
          REACT_APP_DISABLE_AUTH: true

          # TODO: This should be implicit when `CI=true`
          BUILD_NO_PROGRESSBAR: true

          # If we don't do this the built files will end up in
          # `node_modules/@mdn/yari/client/build/` and we don't want that
          # to get pushed into the cache.
          BUILD_OUT_ROOT: /tmp/build

        working-directory: ${{ github.workspace }}/mdn/content
        run: |
          mkdir -p $BUILD_OUT_ROOT

          # Don't use `yarn build` (from mdn/content) because that one hardcodes
          # the BUILD_OUT_ROOT and CONTENT_ROOT env vars.
          node node_modules/@mdn/yari/build/cli.js ${{ env.GIT_DIFF_CONTENT }}

          echo "Disk usage size of build/"
          du -sh $BUILD_OUT_ROOT

          # Save the PR number into the build
          echo ${{ github.event.number }} > $BUILD_OUT_ROOT/NR

      - name: Generate the diff file
        if: ${{ env.GIT_DIFF_CONTENT }}
        env:
          # This must match what we set in the "Build changed content" step above
          BUILD_OUT_ROOT: /tmp/build
        run: |
          # Save the raw diff blob and store that inside the ./build/
          # directory.
          # The purpose of this is for the PR Review Companion to later
          # be able to use this raw diff file for the benefit of analyzing.
          git diff --diff-filter=ACMRT ${{ github.event.pull_request.base.sha }} ${{ github.sha }} > $BUILD_OUT_ROOT/DIFF

      - name: Merge static assets with built documents
        if: ${{ env.GIT_DIFF_CONTENT }}
        env:
          # This must match what we set in the "Build changed content" step above
          BUILD_OUT_ROOT: /tmp/build
        run: |
          rsync -a ${{ github.workspace }}/mdn/content/node_modules/@mdn/yari/client/build/ $BUILD_OUT_ROOT/

          # Now that build/ directory contains everything you need to deploy
          # that as a site. HTML, static assets, images, etc.
          # However, that Yari static files is very heavy and it's in large
          # part due to the .map files.
          # In fact, as of March 2021, the client/build/static directory
          # is 2.3MB but only 864KB without all the .map files.
          # Let's delete those this time because this isn't the right time
          # to debug JS or CSS.
          find $BUILD_OUT_ROOT/static -type f -name "*.map" | xargs rm

      - uses: actions/upload-artifact@v2
        if: ${{ env.GIT_DIFF_CONTENT }}
        env:
          # This must match what we set in the "Build changed content" step above
          BUILD_OUT_ROOT: /tmp/build
        with:
          name: build
          path: ${{ env.BUILD_OUT_ROOT }}

      - uses: technote-space/get-diff-action@v6.0.1
        with:
          PATTERNS: files/**/*.+(png|jpeg|jpg|gif|svg|webp)
          ABSOLUTE: true
          SET_ENV_NAME: GIT_DIFF_FILES

      - name: Check changed files
        if: ${{ env.GIT_DIFF_FILES }}
        env:
          CONTENT_ROOT: ${{ github.workspace }}/mdn/content/files
          CONTENT_TRANSLATED_ROOT: ${{ github.workspace }}/files
        working-directory: ${{ github.workspace }}/mdn/content
        run: |
          echo ${{ env.GIT_DIFF_FILES }}

          yarn filecheck ${{ env.GIT_DIFF_FILES }}