name: Telegram Notification on PR Merge

on:
  pull_request:
    types:
      - closed  # 当 PR 被关闭（合并或关闭）时触发

jobs:
  notify:
    runs-on: ubuntu-latest
    
    # 只在 PR 被合并到 main 分支时执行
    if: github.event.pull_request.merged == true && github.event.pull_request.base.ref == 'main'
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
      
      - name: Get PR details
        id: pr_details
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          PR_NUMBER="${{ github.event.pull_request.number }}"
          REPO="${{ github.repository }}"
          
          # 获取 PR 详细信息
          PR_RESPONSE=$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" \
            -H "Accept: application/vnd.github.v3+json" \
            "https://api.github.com/repos/${REPO}/pulls/${PR_NUMBER}")
          
          # 获取 PR 变更的文件列表
          FILES_RESPONSE=$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" \
            -H "Accept: application/vnd.github.v3+json" \
            "https://api.github.com/repos/${REPO}/pulls/${PR_NUMBER}/files")
          
          # 提取 PR 描述（body），保留换行，限制长度
          PR_BODY=$(echo "$PR_RESPONSE" | jq -r '.body // ""')
          if [ ${#PR_BODY} -gt 500 ]; then
            PR_BODY="${PR_BODY:0:500}..."
          fi
          
          # 保存到输出变量（使用 base64 编码避免特殊字符问题）
          echo "pr_body<<EOF" >> $GITHUB_OUTPUT
          echo "$PR_BODY" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT
      
      - name: Send Telegram notification
        env:
          TELEGRAM_BOT_TOKEN: ${{ secrets.TELEGRAM_BOT_TOKEN }}
          TELEGRAM_CHAT_ID: ${{ secrets.TELEGRAM_CHAT_ID }}
        run: |
          # 检查 PR 是否被合并（而不是仅关闭）
          PR_MERGED="${{ github.event.pull_request.merged }}"
          if [ "$PR_MERGED" != "true" ]; then
            echo "ℹ️  PR 仅关闭，未合并，跳过通知"
            exit 0
          fi
          
          # 检查必要的环境变量
          # 注意：TELEGRAM_CHAT_ID 可以是个人聊天 ID（正数）或群组 ID（负数，如 -1001234567890）
          if [ -z "$TELEGRAM_BOT_TOKEN" ] || [ -z "$TELEGRAM_CHAT_ID" ]; then
            echo "⚠️  Telegram Bot Token 或 Chat ID 未配置，跳过通知"
            exit 0
          fi
          
          # 获取 PR 基本信息
          PR_NUMBER="${{ github.event.pull_request.number }}"
          PR_TITLE="${{ github.event.pull_request.title }}"
          PR_URL="${{ github.event.pull_request.html_url }}"
          PR_MERGE_COMMIT="${{ github.event.pull_request.merge_commit_sha }}"
          
          # 获取 PR 详细信息
          PR_BODY="${{ steps.pr_details.outputs.pr_body }}"
          
          # 转义 PR 标题中的 HTML 特殊字符
          PR_TITLE_ESCAPED=$(echo "$PR_TITLE" | sed 's/&/\&amp;/g' | sed 's/</\&lt;/g' | sed 's/>/\&gt;/g')
          
          # 构建消息内容（仅包含关键信息）
          MESSAGE="🚀 <b>main 分支代码更新</b>"$'\n'$'\n'"📝 <b>PR #${PR_NUMBER}:</b> ${PR_TITLE_ESCAPED}"$'\n'"🔗 <a href=\"${PR_URL}\">查看 PR</a>"
          
          # 发送 Telegram 消息（使用 jq 转义 JSON）
          curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
            -H "Content-Type: application/json" \
            -d "$(jq -n \
              --arg chat_id "$TELEGRAM_CHAT_ID" \
              --arg text "$MESSAGE" \
              '{chat_id: $chat_id, text: $text, parse_mode: "HTML", disable_web_page_preview: false}')" > /tmp/telegram_response.json
          
          # 检查发送结果
          if [ $? -eq 0 ]; then
            RESPONSE=$(cat /tmp/telegram_response.json)
            if echo "$RESPONSE" | grep -q '"ok":true'; then
              echo "✅ Telegram 通知发送成功"
            else
              echo "❌ Telegram 通知发送失败: $RESPONSE"
              exit 1
            fi
          else
            echo "❌ 发送 Telegram 消息时发生错误"
            exit 1
          fi