name: Stale Issue Management
on:
  schedule:
    - cron: '0 0 */3 * *'
  workflow_dispatch:

jobs:
  process-stale-issues:
    runs-on: ubuntu-latest
    permissions:
      issues: write
      pull-requests: write
    steps:
      - name: Process stale issues
        uses: actions/github-script@v6
        with:
          script: |
            const { Octokit } = require('@octokit/rest')
            const octokit = new Octokit({ auth: process.env.GITHUB_TOKEN })

            const EXEMPTION_LABEL = 'pending'
            const STALE_LABEL = 'inactive'
            const DAYS_TO_STALE = 30
            const DAYS_TO_CLOSE = 60

            const issues = await octokit.paginate(octokit.rest.issues.listForRepo, {
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open',
            })

            const now = new Date()
            
            for (const issue of issues) {
              if (issue.pull_request || issue.labels.some(l => l.name === EXEMPTION_LABEL)) {
                continue
              }

              const lastUpdated = new Date(issue.updated_at)
              const daysInactive = Math.floor((now - lastUpdated) / (1000 * 3600 * 24))

              if (daysInactive > DAYS_TO_CLOSE) {
                await octokit.rest.issues.createComment({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: issue.number,
                  body: `⏰ 该 issue 因 ${DAYS_TO_CLOSE} 天无更新已自动关闭，如需跟进可重新打开`
                })

                await octokit.rest.issues.update({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  issue_number: issue.number,
                  state: 'closed'
                })
                continue
              }

              if (daysInactive > DAYS_TO_STALE) {
                if (!issue.labels.some(l => l.name === STALE_LABEL)) {
                  await octokit.rest.issues.addLabels({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    issue_number: issue.number,
                    labels: [STALE_LABEL]
                  })

                  await octokit.rest.issues.createComment({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    issue_number: issue.number,
                    body: `⚠️ 该 issue 已 ${DAYS_TO_STALE} 天无更新，将保持跟踪。如果 ${DAYS_TO_CLOSE - DAYS_TO_STALE} 天内无更新会被自动关闭`
                  })
                }
              }
            }