#!/usr/bin/env pwsh
param(
  [Parameter(Mandatory = $true)]
  [string]$SummaryFile
)

$ErrorActionPreference = 'Stop'

if (-not (Test-Path $SummaryFile)) {
  throw "Summary file not found: $SummaryFile"
}

$summary = Get-Content -Raw -Path $SummaryFile | ConvertFrom-Json
$metrics = $summary.metrics

if (-not $metrics) {
  throw 'Invalid k6 summary file: missing metrics object.'
}

$endpoints = @('overview', 'analytics', 'chat_log', 'users')

function Get-MetricValue {
  param(
    [object]$Metric,
    [string]$Key
  )

  if (-not $Metric) {
    return $null
  }
  if (-not $Metric.values) {
    return $null
  }

  $value = $Metric.values.$Key
  if ($null -ne $value) {
    return [double]$value
  }
  return $null
}

$globalDuration = Get-MetricValue -Metric $metrics.http_req_duration -Key 'p(95)'
$globalFailRate = Get-MetricValue -Metric $metrics.http_req_failed -Key 'rate'

Write-Output "k6 Summary: $SummaryFile"
if ($null -ne $globalDuration) {
  Write-Output ("Global p95 duration (ms): {0:N2}" -f $globalDuration)
}
if ($null -ne $globalFailRate) {
  Write-Output ("Global failure rate: {0:P2}" -f $globalFailRate)
}
Write-Output ''

$rows = foreach ($endpoint in $endpoints) {
  $durationMetricName = "http_req_duration{endpoint:$endpoint}"
  $failMetricName = "http_req_failed{endpoint:$endpoint}"

  $durationP95 = Get-MetricValue -Metric $metrics.$durationMetricName -Key 'p(95)'
  $failRate = Get-MetricValue -Metric $metrics.$failMetricName -Key 'rate'

  [PSCustomObject]@{
    Endpoint   = $endpoint
    P95Ms      = if ($null -ne $durationP95) { [math]::Round($durationP95, 2) } else { $null }
    FailurePct = if ($null -ne $failRate) { [math]::Round($failRate * 100, 4) } else { $null }
  }
}

$rows | Format-Table -AutoSize | Out-String | Write-Output