name: Commit Artifacts for Facebook WWW

on:
  push:
    branches: [main]

jobs:
  download_artifacts:
    runs-on: ubuntu-latest
    steps:
      - name: Download and unzip artifacts
        uses: actions/github-script@v6
        with:
          script: |
            const cp = require('child_process');

            function sleep(ms) {
              return new Promise(resolve => setTimeout(resolve, ms));
            }

            function execHelper(command, options, streamStdout = false) {
              return new Promise((resolve, reject) => {
                const proc = cp.exec(
                  command,
                  options,
                  (error, stdout) => (error ? reject(error) : resolve(stdout.trim())),
                );
                if (streamStdout) {
                  proc.stdout.pipe(process.stdout);
                }
              });
            }

            let artifactsUrl = null;
            // This is a temporary, dirty hack to avoid needing a GitHub auth token in the circleci
            // workflow to notify this GitHub action. Sorry!
            let iter = 0;
            spinloop: while (iter < 15) {
              const res = await github.rest.repos.listCommitStatusesForRef({
                owner: context.repo.owner,
                repo: context.repo.repo,
                ref: context.sha
              });
              for (const status of res.data) {
                if (/process_artifacts_combined/.test(status.context)) {
                  switch (status.state) {
                    case 'pending': {
                      console.log(`${status.context} is still pending`);
                      break;
                    }
                    case 'failure':
                    case 'error': {
                      throw new Error(`${status.context} has failed or errored`);
                    }
                    case 'success': {
                      // The status does not include a build ID, but we can extract it
                      // from the URL. I couldn't find a better way to do this.
                      const ciBuildId = /\/facebook\/react\/([0-9]+)/.exec(
                        status.target_url,
                      )[1];
                      console.log(`CircleCI build id found: ${ciBuildId}`);
                      if (Number.parseInt(ciBuildId, 10) + '' === ciBuildId) {
                        artifactsUrl =
                          `https://circleci.com/api/v1.1/project/github/facebook/react/${ciBuildId}/artifacts`;
                        break spinloop;
                      } else {
                        throw new Error(`${ciBuildId} isn't a number`);
                      }
                      break;
                    }
                    default: {
                      throw new Error(`Unhandled status state: ${status.state}`);
                      break;
                    }
                  }
                }
              }
              iter++;
              console.log("Sleeping for 60s...");
              await sleep(60_000);
            }
            if (artifactsUrl != null) {
              const res = await fetch(artifactsUrl);
              const data = await res.json();
              for (const artifact of data) {
                if (artifact.path === 'build.tgz') {
                  console.log(`Downloading and unzipping ${artifact.url}`);
                  await execHelper(
                    `curl -L ${artifact.url} | tar -xvz`
                  );
                }
              }
            } else {
              process.exitCode = 1;
            }
      - name: Strip @license from eslint plugin and react-refresh
        run: |
          sed -i -e 's/ @license React*//' \
            build/oss-stable/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
            build/oss-stable/react-refresh/cjs/react-refresh-babel.development.js
      - name: Move relevant files into compiled
        run: |
          mkdir -p ./compiled
          mkdir -p ./compiled/facebook-www
          mkdir -p ./compiled/babel-plugin-react-refresh

          # Copy the facebook-www folder into compiled
          mv build/facebook-www ./compiled

          # Copy WARNINGS to facebook-www
          mv build/WARNINGS ./compiled/facebook-www/WARNINGS

          # Copy eslint-plugin-react-hooks into facebook-www
          mv build/oss-stable/eslint-plugin-react-hooks/cjs/eslint-plugin-react-hooks.development.js \
            ./compiled/facebook-www/eslint-plugin-react-hooks.js

          # Copy unstable_server-external-runtime.js into facebook-www
          mv build/oss-stable/react-dom/unstable_server-external-runtime.js \
            ./compiled/facebook-www/unstable_server-external-runtime.js

          # Copy react-refresh-babel.development.js into babel-plugin-react-refresh
          mv build/oss-stable/react-refresh/cjs/react-refresh-babel.development.js \
            ./compiled/babel-plugin-react-refresh/index.js

          ls -R ./compiled
      - name: Add REVISION files
        run: |
          echo ${{ github.sha }} >> ./compiled/facebook-www/REVISION
          cp ./compiled/facebook-www/REVISION ./compiled/facebook-www/REVISION_TRANSFORMS
      - uses: actions/upload-artifact@v3
        with:
          name: compiled
          path: compiled/

  commit_artifacts:
    needs: download_artifacts
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          ref: builds/facebook-www
      - name: Ensure clean directory
        run: rm -rf compiled
      - uses: actions/download-artifact@v3
        with:
          name: compiled
          path: compiled/
      - run: git status -u
      - name: Commit changes to branch
        uses: stefanzweifel/git-auto-commit-action@v4
        with:
          commit_message: |
            ${{ github.event.head_commit.message }}

            DiffTrain build for commit ${{ github.sha }}.
          branch: builds/facebook-www
          commit_user_name: ${{ github.actor }}
          commit_user_email: ${{ github.actor }}@users.noreply.github.com
          create_branch: true