name: Issue closer.

on:
  issues:
    types: opened

jobs:
  comment:
    runs-on: ubuntu-latest
    steps:
      - name: Get the latest version.
        run: |
          tag=$(git ls-remote --tags git://github.com/$GITHUB_REPOSITORY | cut -f 2 | tail -n1)
          echo $tag
          echo "LATEST_TAG=$tag" >> $GITHUB_ENV

      - name: Get the latest macOS version.
        shell: python
        run: |
          import subprocess;
          from xml.dom import minidom;

          url = "https://osx.telegram.org/updates/versions.xml";
          subprocess.check_call("wget %s" % url, shell=True);

          xmldoc = minidom.parse('versions.xml');
          itemlist = xmldoc.getElementsByTagName('enclosure');
          ver = itemlist[0].attributes['sparkle:shortVersionString'].value;
          print(ver);

          open(os.environ['GITHUB_ENV'], "a").write("LATEST_MACOS=" + ver);

      - name: Check a version from an issue.
        uses: actions/github-script@0.4.0
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            let errorStr = "Version not found.";

            function maxIndexOf(str, i) {
              let index = str.indexOf(i);
              return (index == -1) ? Number.MAX_SAFE_INTEGER : index;
            }

            let item1 = "Version of Telegram Desktop";
            let item2 = "Installation source";
            let item3 = "Used theme";
            let item4 = "<details>";
            let body = context.payload.issue.body;

            console.log("Body of issue:\n" + body);
            let index1 = body.indexOf(item1);
            let index2 = Math.min(
              Math.min(
                maxIndexOf(body, item2),
                maxIndexOf(body, item3)),
              maxIndexOf(body, item4));

            console.log("Index 1: " + index1);
            console.log("Index 2: " + index2);

            if (index1 == -1) {
              console.log(errorStr);
              return;
            }

            function parseVersion(str) {
              let pattern = /[0-9]\.[0-9][0-9.]{0,}/g;
              return str.match(pattern);
            }
            function firstNum(version) {
              return version[0].split(".")[0];
            }

            let issueVer = parseVersion(body.substring(index1 + item1.length, index2));

            if (issueVer == undefined) {
              console.log(errorStr);
              return;
            }
            console.log("Version from issue: " + issueVer[0]);

            let latestVer = parseVersion(process.env.LATEST_TAG);

            if (latestVer == undefined) {
              console.log(errorStr);
              return;
            }
            console.log("Version from tags: " + latestVer[0]);

            let issueNum = firstNum(issueVer);
            let latestNum = firstNum(latestVer);

            let macos_ver = process.env.LATEST_MACOS;
            console.log("Telegram for MacOS version from website: " + macos_ver);

            if (issueNum <= latestNum && issueNum < macos_ver) {
              console.log("Seems the version of this issue is fine!");
              return;
            }
            if (issueNum > macos_ver) {
              let message = `Seems like it's neither the Telegram Desktop\
              nor the Telegram for macOS version.
              `;
              console.log(message);
              return;
            }

            let message = `
            Sorry, but according to the version you specify in this issue, \
            you are using the [Telegram for macOS](https://macos.telegram.org), \
            not the [Telegram Desktop](https://desktop.telegram.org).
            You can report your issue to [the group](https://t.me/macswift) \
            or to [the repository of Telegram for macOS](https://github.com/overtake/TelegramSwift).

            **If I made a mistake and closed your issue wrongly, please reopen it. Thanks!**
            `;

            let params = {
              owner: context.issue.owner,
              repo: context.issue.repo,
              issue_number: context.issue.number
            };

            github.issues.createComment({
              ...params,
              body: message
            });

            github.issues.addLabels({
              ...params,
              labels: ['TG macOS Swift']
            });

            github.issues.update({
              ...params,
              state: 'closed'
            });