$ErrorActionPreference = 'Stop'
$projectRoot = Split-Path -Parent $PSScriptRoot
$py = "$projectRoot\.venv\Scripts\python.exe"
$runservicesLog = "$projectRoot\.runtime\runservices.stdout.log"
$runservicesErr = "$projectRoot\.runtime\runservices.stderr.log"
$pidFile = "$projectRoot\.runtime\runservices.json"
$action = 'start'
if ($args.Count -gt 0) { $action = $args[0] }

function Get-ProjectServices {
    Get-CimInstance Win32_Process -Filter "Name='python.exe'" |
        Where-Object { $_.CommandLine -like '*manage.py runservices*' -and $_.CommandLine -like '*video_monitor*' }
}

function Get-Descendants([int]$ParentId) {
    $children = @()
    Get-CimInstance Win32_Process -Filter "ParentProcessId=$ParentId" -ErrorAction SilentlyContinue | ForEach-Object {
        $children += $_
        $children += Get-Descendants $_.ProcessId
    }
    $children
}

switch ($action) {
    'start' {
        $existing = Get-ProjectServices
        if ($existing) {
            Write-Host "runservices already running: PIDs $($existing.ProcessId -join ', ')"
            exit 0
        }
        New-Item -ItemType Directory -Force -Path "$projectRoot\.runtime" | Out-Null
        $p = Start-Process -FilePath $py -ArgumentList @('manage.py','runservices') `
            -WorkingDirectory $projectRoot -WindowStyle Hidden `
            -RedirectStandardOutput $runservicesLog -RedirectStandardError $runservicesErr -PassThru
        @{ pid = $p.Id; created = (Get-Date).ToString('o') } | ConvertTo-Json | Set-Content $pidFile -Encoding UTF8
        Write-Host "runservices started PID=$($p.Id)"
        Start-Sleep -Seconds 20
        $zlm = Get-CimInstance Win32_Process -Filter "Name='monitor_zlm.exe'" -ErrorAction SilentlyContinue
        $sip = Get-NetUDPEndpoint -LocalPort 15060 -ErrorAction SilentlyContinue
        if ($zlm) { Write-Host "ZLM up PID=$($zlm.ProcessId -join ', ')" } else { Write-Host 'ZLM not up yet; inspect log' }
        if ($sip) { Write-Host 'SIP 15060 listening' } else { Write-Host 'SIP 15060 not listening yet' }
    }
    'stop' {
        $procs = Get-ProjectServices
        if (-not $procs) {
            Write-Host 'No runservices process running'
            Remove-Item $pidFile -ErrorAction SilentlyContinue
            exit 0
        }
        foreach ($proc in $procs) {
            $desc = Get-Descendants $proc.ProcessId
            foreach ($child in $desc) {
                Stop-Process -Id $child.ProcessId -Force -ErrorAction SilentlyContinue
            }
            Stop-Process -Id $proc.ProcessId -Force -ErrorAction SilentlyContinue
            Write-Host "stopped runservices PID=$($proc.ProcessId) (children: $($desc.ProcessId -join ', '))"
        }
        Remove-Item $pidFile -ErrorAction SilentlyContinue
    }
    'status' {
        $procs = Get-ProjectServices
        $zlm = Get-CimInstance Win32_Process -Filter "Name='monitor_zlm.exe'" -ErrorAction SilentlyContinue
        $sip = Get-NetUDPEndpoint -LocalPort 15060 -ErrorAction SilentlyContinue
        [pscustomobject]@{
            runservices = ($procs | ForEach-Object { $_.ProcessId }) -join ', '
            zlm         = ($zlm | ForEach-Object { $_.ProcessId }) -join ', '
            sip_15060   = [bool]$sip
        } | Format-List
    }
    default {
        Write-Host "Usage: .\scripts\start-services.ps1 [start|stop|status]"
        exit 1
    }
}