$ErrorActionPreference = "Stop"

$reportDir = Join-Path $PSScriptRoot "reports"
$htmlReport = Join-Path $reportDir "frontend-performance-report.html"
$csvPrefix = Join-Path $reportDir "frontend-performance"
$pendingFile = Join-Path $reportDir "frontend_performance_pending.txt"

New-Item -ItemType Directory -Path $reportDir -Force | Out-Null

$locust = Get-Command locust -ErrorAction SilentlyContinue
if ($null -eq $locust) {
  @(
    "ServicePilot 前端性能测试未执行",
    "原因：当前环境未安装 Locust 命令。",
    "安装命令：pip install -r requirements.txt",
    "执行命令：powershell -ExecutionPolicy Bypass -File .\run_frontend_performance.ps1",
    "预期输出：reports/frontend-performance-report.html 与 reports/frontend-performance_*.csv"
  ) | Set-Content -Path $pendingFile -Encoding UTF8
  Write-Host "Locust 未安装，已生成待执行说明：$pendingFile"
  exit 1
}

& $locust.Source -f "$PSScriptRoot\locustfile_frontend.py" `
  --host "http://127.0.0.1:4301" `
  --headless `
  -u 30 `
  -r 5 `
  -t 3m `
  --html "$htmlReport" `
  --csv "$csvPrefix"

$exitCode = $LASTEXITCODE
if ($exitCode -ne 0) {
  exit $exitCode
}

if (Test-Path $pendingFile) {
  Remove-Item -LiteralPath $pendingFile -Force
}

$statsFile = "${csvPrefix}_stats.csv"
$summaryFile = Join-Path $reportDir "frontend_performance_summary.txt"
$aggregate = Import-Csv -LiteralPath $statsFile | Where-Object { $_.Name -eq "Aggregated" } | Select-Object -First 1

if ($null -ne $aggregate) {
  $requestCount = [int]$aggregate.'Request Count'
  $failureCount = [int]$aggregate.'Failure Count'
  $failureRate = 0
  if ($requestCount -gt 0) {
    $failureRate = [math]::Round(($failureCount / $requestCount) * 100, 2)
  }

  @(
    "ServicePilot 前端性能测试执行记录",
    "执行时间：$(Get-Date -Format 'yyyy-MM-dd HH:mm:ss')",
    "压测工具：Locust",
    "测试对象：http://127.0.0.1:4301",
    "压测配置：30 用户，启动速率 5 用户/秒，持续 3 分钟",
    "请求总数：$requestCount",
    "失败请求数：$failureCount",
    "失败率：$failureRate%",
    "平均响应时间：$([math]::Round([double]$aggregate.'Average Response Time', 2)) ms",
    "P95 响应时间：$($aggregate.'95%') ms",
    "最大响应时间：$([math]::Round([double]$aggregate.'Max Response Time', 2)) ms",
    "吞吐量：$([math]::Round([double]$aggregate.'Requests/s', 2)) req/s",
    "HTML 报告：$htmlReport",
    "CSV 明细：$statsFile",
    "执行结果：PASS"
  ) | Set-Content -Path $summaryFile -Encoding UTF8

  Write-Host "前端性能测试摘要已生成：$summaryFile"
}