# Benchmark CI Workflow
# 分层策略:
#   - PR 趋势监控: 宽松阈值，不阻塞合并
#   - 定期完整检测: 严格阈值，生成报告
#
# 作者: xfy

name: Benchmark

on:
  push:
    branches: [master]
  pull_request:
    branches: [master]
  schedule:
    # 每周一凌晨 2 点运行完整检测
    - cron: '0 2 * * 1'
  workflow_dispatch:
    inputs:
      full:
        description: 'Run full benchmark suite'
        required: false
        default: 'false'

env:
  GO_VERSION: '1.23'
  BENCH_COUNT: 10

jobs:
  # PR 趋势监控 - 宽松阈值，仅警告
  benchmark-pr:
    name: PR Benchmark
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    timeout-minutes: 15
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Setup Go
        uses: actions/setup-go@v5
        with:
          go-version: ${{ env.GO_VERSION }}

      - name: Run core benchmarks
        id: bench
        run: |
          # 运行核心模块基准测试
          go test -bench='Benchmark(Variable|Compression|RateLimiter|SlidingWindow|AccessLog|Static|Cache|Proxy|LoadBalance)' \
            -benchmem -count=${{ env.BENCH_COUNT }} -timeout=10m ./... 2>&1 | tee benchmark-pr.txt

          # 统计测试数量
          echo "test_count=$(grep -c 'ns/op' benchmark-pr.txt || echo 0)" >> $GITHUB_OUTPUT

      - name: Check regression (warning only)
        run: |
          # 宽松阈值 ±20%，仅作警告
          python3 scripts/check_regression.py \
            --warning-threshold 20 \
            --block-threshold 30 \
            benchmark-pr.txt || \
            echo "::warning::Potential performance change detected (±20% threshold)"

      - name: Comment on PR
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const output = fs.readFileSync('benchmark-pr.txt', 'utf8');
            const lines = output.split('\n').filter(l => l.includes('ns/op')).slice(0, 25);

            const body = `## 📊 Benchmark Results

            \`\`\`
            ${lines.join('\n')}
            \`\`\`

            - Tests run: ${{ steps.bench.outputs.test_count }}
            - Threshold: ±20% (warning only)
            `;

            github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: body
            });

      - name: Upload results
        uses: actions/upload-artifact@v4
        with:
          name: benchmark-pr-results
          path: benchmark-pr.txt
          retention-days: 7

  # 定期完整检测 - 严格阈值
  benchmark-weekly:
    name: Weekly Full Benchmark
    if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
    runs-on: ubuntu-latest
    timeout-minutes: 30
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Go
        uses: actions/setup-go@v5
        with:
          go-version: ${{ env.GO_VERSION }}

      - name: Install benchstat
        run: go install golang.org/x/perf/cmd/benchstat@latest

      - name: Run full benchmarks
        id: bench
        run: |
          echo "Running full benchmark suite..."
          go test -bench=. -benchmem -count=20 -timeout=25m ./... 2>&1 | tee benchmark-full.txt

          # 生成统计报告
          benchstat benchmark-full.txt > benchmark-stat.txt || true

          echo "test_count=$(grep -c 'ns/op' benchmark-full.txt || echo 0)" >> $GITHUB_OUTPUT

      - name: Check regression with config
        run: |
          if [ -f .benchmark-thresholds.yaml ]; then
            python3 scripts/check_regression.py \
              --config .benchmark-thresholds.yaml \
              --environment ci \
              benchmark-full.txt || true
          else
            python3 scripts/check_regression.py \
              --warning-threshold 15 \
              --block-threshold 25 \
              benchmark-full.txt || true
          fi

      - name: Upload baseline
        uses: actions/upload-artifact@v4
        with:
          name: benchmark-baseline
          path: benchmark-full.txt
          retention-days: 30

      - name: Upload report
        uses: actions/upload-artifact@v4
        with:
          name: benchmark-report
          path: |
            benchmark-stat.txt
          retention-days: 90

      - name: Create issue on regression
        if: failure()
        uses: actions/github-script@v7
        with:
          script: |
            github.rest.issues.create({
              owner: context.repo.owner,
              repo: context.repo.repo,
              title: `🚨 Performance Regression Detected - ${new Date().toISOString().split('T')[0]}`,
              body: `Weekly benchmark detected performance regression.\n\nSee [workflow run](${process.env.GITHUB_SERVER_URL}/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId})`,
              labels: ['performance', 'regression']
            });

  # 保存基准线
  benchmark-save:
    name: Save Benchmark Baseline
    if: github.ref == 'refs/heads/master'
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Setup Go
        uses: actions/setup-go@v5
        with:
          go-version: ${{ env.GO_VERSION }}

      - name: Run benchmarks
        run: |
          go test -bench=. -benchmem -count=${{ env.BENCH_COUNT }} ./... > benchmark-main.txt

      - name: Upload baseline
        uses: actions/upload-artifact@v4
        with:
          name: benchmark-baseline-main
          path: benchmark-main.txt
          retention-days: 90