<#
.SYNOPSIS
  Runs the headless automation tests (no window, no renderer) and prints one line per test.

.DESCRIPTION
  UnrealEditor-Cmd.exe with -nullrhi runs `Automation RunTests <Filter>`, writes the JSON report to
  Saved\Automation\Reports\index.json and exits when the queue is empty. Test names all start with "Descent."
  Log of the run: Saved\Logs\run_tests_last.log

.EXAMPLE
  powershell -NoProfile -ExecutionPolicy Bypass -File Tools\run_tests.ps1
  powershell -NoProfile -ExecutionPolicy Bypass -File Tools\run_tests.ps1 -Filter Descent.Kazah
  Exit code 0 = PASS (at least one test ran and none failed), 1 = FAIL.
#>
[CmdletBinding()]
param(
    [string]$Filter = 'Descent',
    [int]$TimeoutSec = 300
)
$ErrorActionPreference = 'Stop'
$ProjectRoot = Split-Path -Parent $PSScriptRoot
$Uproject = Join-Path $ProjectRoot 'TheDescent.uproject'
$EditorCmd = 'E:\Tools\UE_5.8\Engine\Binaries\Win64\UnrealEditor-Cmd.exe'
$ReportDir = Join-Path $ProjectRoot 'Saved\Automation\Reports'
$LogFile = Join-Path $ProjectRoot 'Saved\Logs\run_tests_last.log'

if (-not (Test-Path $EditorCmd)) { Write-Host "TESTS FAIL: $EditorCmd not found"; exit 1 }
New-Item -ItemType Directory -Force -Path (Split-Path $LogFile) | Out-Null
if (Test-Path $ReportDir) { Remove-Item $ReportDir -Recurse -Force }
New-Item -ItemType Directory -Force -Path $ReportDir | Out-Null
$env:UE_SDKS_ROOT = 'D:\HADAL - The Descent\.tools\AutoSDK'

$argList = @(
    ('"' + $Uproject + '"'),
    ('-ExecCmds="Automation RunTests ' + $Filter + '"'),
    '-TestExit="Automation Test Queue Empty"',
    ('-ReportExportPath="' + $ReportDir + '"'),
    '-nullrhi', '-unattended', '-nopause', '-nosplash', '-nosound', '-NoLiveCoding',
    ('-abslog="' + $LogFile + '"')
)
$sw = [System.Diagnostics.Stopwatch]::StartNew()
$proc = Start-Process -FilePath $EditorCmd -ArgumentList $argList -PassThru -WindowStyle Hidden
$timedOut = $false
if (-not $proc.WaitForExit($TimeoutSec * 1000)) {
    $timedOut = $true
    Write-Host ("time limit reached, stopping process {0} (the one this script started)" -f $proc.Id)
    & taskkill.exe /PID $proc.Id /T /F | Out-Null
    [void]$proc.WaitForExit(15000)
}
$sw.Stop()
$exitCode = if ($proc.HasExited) { $proc.ExitCode } else { -1 }

$indexPath = Join-Path $ReportDir 'index.json'
$secs = [math]::Round($sw.Elapsed.TotalSeconds, 1)
if (-not (Test-Path $indexPath)) {
    Write-Host ("TESTS FAIL  no report was written ({0}); exit={1}  {2}s  log={3}" -f $(if ($timedOut) { 'timed out' } else { 'the run ended early' }), $exitCode, $secs, $LogFile)
    exit 1
}
$report = Get-Content $indexPath -Raw | ConvertFrom-Json
$tests = @($report.tests)
$failed = 0
foreach ($t in $tests) {
    $ok = ($t.state -eq 'Success')
    if (-not $ok) { $failed++ }
    $label = if ($ok) { 'PASS' } else { 'FAIL' }
    Write-Host ("  {0}  {1}  ({2}s)" -f $label, $t.fullTestPath, [math]::Round([double]$t.duration, 3))
    if (-not $ok) {
        foreach ($e in @($t.entries)) {
            if ($e.event.type -in 'Error', 'Warning') { Write-Host ("        {0}: {1}" -f $e.event.type, $e.event.message) }
        }
    }
}
if ($tests.Count -eq 0) { Write-Host ("TESTS FAIL  the filter '{0}' matched no tests  {1}s" -f $Filter, $secs); exit 1 }
if ($failed -eq 0 -and $exitCode -eq 0) {
    Write-Host ("TESTS PASS  {0} tests  {1}s" -f $tests.Count, $secs)
    exit 0
}
Write-Host ("TESTS FAIL  {0} of {1} failed  exit={2}  {3}s  log={4}" -f $failed, $tests.Count, $exitCode, $secs, $LogFile)
exit 1