# PR 合并后自动关闭关联的 Issue
# 当 PR 从 ai_fix/N_xxx 分支合并到 main 时，关闭 #N 对应的 Issue（若 PR 描述中未含 Closes #N 则通过分支名解析）

name: Close issue on PR merge

on:
  pull_request:
    types: [closed]
    branches: [main]

jobs:
  close-issue:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    permissions:
      issues: write
      pull-requests: read

    steps:
      - name: Get PR info
        id: pr
        run: |
          # 从 PR body 查找 Closes #N / Fixes #N（若已有则 GitHub 已自动关 issue，本 step 仅做解析）
          BODY="${{ github.event.pull_request.body }}"
          HEAD_REF="${{ github.event.pull_request.head.ref }}"

          # 优先从 PR 描述解析
          ISSUE_NUM=$(echo "$BODY" | grep -oE '(Closes|Fixes|Resolves) #([0-9]+)' | head -1 | grep -oE '[0-9]+')
          if [ -z "$ISSUE_NUM" ]; then
            # 从分支名解析 ai_fix/N_xxx
            ISSUE_NUM=$(echo "$HEAD_REF" | sed -n 's|^ai_fix/\([0-9]*\)_.*|\1|p')
          fi

          if [ -z "$ISSUE_NUM" ]; then
            echo "ISSUE_NUMBER=" >> $GITHUB_OUTPUT
            echo "skip=true" >> $GITHUB_OUTPUT
            echo "未从 PR 描述或分支名解析到 Issue 编号，跳过关闭"
            exit 0
          fi

          echo "ISSUE_NUMBER=$ISSUE_NUM" >> $GITHUB_OUTPUT
          echo "skip=false" >> $GITHUB_OUTPUT
          echo "解析到 Issue #$ISSUE_NUM"

      - name: Close issue
        if: steps.pr.outputs.skip != 'true'
        uses: actions/github-script@v7
        with:
          script: |
            const issueNumber = parseInt('${{ steps.pr.outputs.ISSUE_NUMBER }}', 10);
            if (!issueNumber || isNaN(issueNumber)) {
              console.log('No valid issue number, skip');
              return;
            }
            const { data: issue } = await github.rest.issues.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: issueNumber
            });
            if (issue.state === 'open') {
              await github.rest.issues.update({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: issueNumber,
                state: 'closed'
              });
              console.log(`Issue #${issueNumber} closed.`);
            } else {
              console.log(`Issue #${issueNumber} already closed.`);
            }