name: Sync GitHub mirror metadata

on:
  push:
  workflow_dispatch:
  schedule:
    - cron: "17 3 * * *"

jobs:
  sync-metadata:
    runs-on: ubuntu-latest
    steps:
      - name: Sync description and topics
        env:
          GITEA_API_URL: ${{ gitea.api_url }}
          GITEA_TOKEN: ${{ gitea.token }}
          SOURCE_REPOSITORY: ${{ gitea.repository }}
          GITHUB_CREDENTIALS: ${{ secrets.CREDENTIALS_FOR_GITHUB }}
          GITHUB_REPO: Tirsvad-Udemy-100_days_of_code
        run: |
          python3 - <<'PY'
          import json
          import os
          import urllib.error
          import urllib.request

          def request_json(url, method="GET", headers=None, body=None):
              request = urllib.request.Request(
                  url,
                  data=json.dumps(body).encode("utf-8") if body is not None else None,
                  headers=headers or {},
                  method=method,
              )
              try:
                  with urllib.request.urlopen(request, timeout=30) as response:
                      content = response.read()
                      return json.loads(content) if content else None
              except urllib.error.HTTPError as error:
                  raise RuntimeError(
                      f"API request failed with HTTP {error.code} ({error.reason})"
                  ) from None

          credentials = json.loads(os.environ["GITHUB_CREDENTIALS"])
          github_token = credentials.get("GITHUB_PAT")
          github_user = credentials.get("GITHUB_USER")

          if not github_token or not github_user:
              raise RuntimeError(
                  "CREDENTIALS_FOR_GITHUB must contain GITHUB_PAT and GITHUB_USER."
              )

          source_owner, separator, source_repo = os.environ[
              "SOURCE_REPOSITORY"
          ].partition("/")
          if not separator or not source_owner or not source_repo:
              raise RuntimeError("Could not determine the Gitea source repository.")

          gitea_api_url = os.environ["GITEA_API_URL"].rstrip("/")
          source_url = (
              f"{gitea_api_url}/repos/{source_owner}/{source_repo}"
          )
          source = request_json(
              source_url,
              headers={
                  "Authorization": f"token {os.environ['GITEA_TOKEN']}",
                  "Accept": "application/json",
              },
          )

          github_repo = os.environ["GITHUB_REPO"]
          github_api_url = (
              f"https://api.github.com/repos/{github_user}/{github_repo}"
          )
          github_headers = {
              "Authorization": f"Bearer {github_token}",
              "Accept": "application/vnd.github+json",
              "X-GitHub-Api-Version": "2022-11-28",
              "Content-Type": "application/json",
          }

          request_json(
              github_api_url,
              method="PATCH",
              headers=github_headers,
              body={"description": source.get("description") or ""},
          )

          request_json(
              f"{github_api_url}/topics",
              method="PUT",
              headers=github_headers,
              body={"names": source.get("topics") or []},
          )

          print(f"Synced description and topics to {github_user}/{github_repo}.")
          PY