# SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
# SPDX-License-Identifier: MIT
name: Update PRs titles on stable branches

on:
  pull_request:
    types: [opened, edited]
    branches:
      - "stable*"

concurrency:
  group: stable-pr-title-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  update-pr-title:
    runs-on: ubuntu-latest-low
    permissions:
      pull-requests: write
      contents: read

    steps:
      - name: Wait for potential title edits
        run: sleep 15

      - name: Get PR details and update title
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7.0.1
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const { data: pr } = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
            });

            const baseBranch = pr.base.ref;
            const currentTitle = pr.title;

            // Check if this is a stable branch
            // Should not happen as we only trigger on stable* branches 🤷‍♀️
            if (!baseBranch.startsWith('stable')) {
              console.log(`Not a stable branch: ${baseBranch}`);
              return;
            }

            const prefix = `[${baseBranch}]`;

            // Check if title already has the correct prefix and no other stable tags
            const correctTagRegex = new RegExp(`^\\[${baseBranch}\\]\\s*`);
            const hasOtherStableTags = /\[stable[\d.]*\]/.test(currentTitle.replace(correctTagRegex, ''));

            if (correctTagRegex.test(currentTitle) && !hasOtherStableTags) {
              console.log(`Title already has correct prefix only: ${currentTitle}`);
              return;
            }

            // Remove all stable tags and add the correct one
            const cleanTitle = currentTitle.replace(/\[stable[\d.]*\]\s*/g, '').trim();
            const newTitle = `${prefix} ${cleanTitle}`;

            console.log(`Updating title from: "${currentTitle}" to: "${newTitle}"`);

            await github.rest.pulls.update({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
              title: newTitle,
            });