name: Sync Release Notes

on:
  workflow_dispatch:
  push:
    paths:
      - 'CHANGELOG.md'
      - '.github/workflows/sync-releases.yml'

jobs:
  update-releases:
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Update GitHub Releases
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          REPO: ${{ github.repository }}
        run: |
          python3 -c "
          import os, urllib.request, json, re

          token = os.environ['GITHUB_TOKEN']
          repo = os.environ['REPO']
          headers = {
              'Authorization': f'Bearer {token}',
              'Accept': 'application/vnd.github+json',
              'User-Agent': 'Actions-Release-Syncer'
          }

          # 1. 解析 CHANGELOG.md 中的各版本内容
          with open('CHANGELOG.md', 'r', encoding='utf-8') as f:
              content = f.read()

          pattern = r'### (v\d+\.\d+\.\d+)[^\n]*\n(.*?)(?=\n### v|\Z)'
          matches = re.findall(pattern, content, re.DOTALL)
          changelogs = {tag: body.strip() for tag, body in matches}
          print('Found changelogs for tags:', list(changelogs.keys()))

          # 2. 获取现有的 releases
          url = f'https://api.github.com/repos/{repo}/releases'
          req = urllib.request.Request(url, headers=headers)
          with urllib.request.urlopen(req) as resp:
              releases = json.loads(resp.read().decode())

          # 3. 逐个更新 release body
          for r in releases:
              tag = r.get('tag_name')
              rel_id = r.get('id')
              if tag in changelogs:
                  new_body = changelogs[tag]
                  # 补全 compare 链接
                  if 'Full Changelog' not in new_body:
                      new_body += f'\n\n---\n**Full Changelog**: https://github.com/{repo}/commits/{tag}'
                  
                  update_url = f'https://api.github.com/repos/{repo}/releases/{rel_id}'
                  data = json.dumps({'body': new_body}).encode('utf-8')
                  up_req = urllib.request.Request(update_url, data=data, headers=headers, method='PATCH')
                  with urllib.request.urlopen(up_req) as up_resp:
                      print(f'Successfully updated release {tag} (ID: {rel_id})')
              else:
                  print(f'No changelog found for tag {tag}')
          "