name: User-agent updater.

on:
  repository_dispatch:
    types: ["Restart user_agent_updater workflow."]
  schedule:
    # At 00:00 on day-of-month 1.
    - cron: '0 0 1 * *'

jobs:
  User-agent:
    runs-on: ubuntu-latest

    env:
      code_file: "Telegram/SourceFiles/mtproto/details/mtproto_domain_resolver.cpp"
      skip: "0"

    steps:
      - name: Clone.
        if: env.skip == '0'
        uses: actions/checkout@v2

      - name: Write a new version of Google Chrome to the user-agent for DNS.
        if: env.skip == '0'
        shell: python
        run: |
          import subprocess, os, re;

          regExpVersion = "[0-9]+.[0-9]+.[0-9]+.[0-9]+";
          chrome = "Chrome/";

          def newVersion():
            output = subprocess.check_output(["google-chrome", "--version"]);
            version = re.search(regExpVersion, output);
            if not version:
              print("Can't find a Chrome version.");
              exit();
            return version.group(0);

          newChromeVersion = newVersion();
          print(newChromeVersion);

          def writeUserAgent():
            p = os.environ['code_file'];
            w = open(p, "r");
            content = w.read();
            w.close();

            regExpChrome = chrome + regExpVersion;

            version = re.search(regExpChrome, content);
            if not version:
              print("Can't find an user-agent in the code.");
              exit();
            content = re.sub(regExpChrome, chrome + newChromeVersion, content);

            w = open(p, "w");
            w.write(content);

            print("::set-env name=ChromeVersion::" + newChromeVersion);

          writeUserAgent();

      - name: Push to the current branch.
        if: env.skip == '0' && env.ChromeVersion != ''
        run: |
          token=${{ secrets.TOKEN_FOR_MASTER_UPDATER }}
          if [ -z "${token}" ]; then
              echo "Token is unset. Nothing to do."
              exit 0
          fi

          url=https://x-access-token:$token@github.com/$GITHUB_REPOSITORY

          git config --local user.email "action@github.com"
          git config --local user.name "GitHub Action"

          git diff > git_diff.txt
          if [[ ! -s git_diff.txt ]]; then
            echo "Nothing to commit."
            exit 0
          fi

          git add $code_file
          git commit -m "Update User-Agent for DNS to Chrome $ChromeVersion."

          git remote set-url origin $url

          git push origin HEAD:$GITHUB_REF
          echo "Done!"