# HM ITAM Server Start Script
[Console]::OutputEncoding = [System.Text.Encoding]::UTF8

function Get-EnvValue {
    param(
        [string]$FilePath,
        [string]$Key
    )

    if (-not (Test-Path $FilePath)) {
        return $null
    }

    $line = Get-Content $FilePath | Where-Object { $_ -match "^$Key=" } | Select-Object -First 1
    if (-not $line) {
        return $null
    }

    return ($line -split '=', 2)[1].Trim()
}

function Test-TcpPortFast {
    param(
        [string]$HostName,
        [int]$Port,
        [int]$TimeoutMs = 3000
    )

    $client = New-Object System.Net.Sockets.TcpClient
    try {
        $asyncResult = $client.BeginConnect($HostName, $Port, $null, $null)
        if (-not $asyncResult.AsyncWaitHandle.WaitOne($TimeoutMs, $false)) {
            $client.Close()
            return $false
        }

        $client.EndConnect($asyncResult)
        $client.Close()
        return $true
    }
    catch {
        $client.Close()
        return $false
    }
}

Write-Host "============================================" -ForegroundColor Cyan
Write-Host "   HM ITAM System Start" -ForegroundColor Cyan
Write-Host "============================================" -ForegroundColor Cyan
Write-Host ""

Write-Host "[INFO] Checking Node.js and npm..."
if (-not (Get-Command node -ErrorAction SilentlyContinue)) {
    Write-Host "[ERROR] Node.js not found." -ForegroundColor Red
    Read-Host "Press Enter to exit"
    exit
}

if (-not (Test-Path "node_modules")) {
    Write-Host "[INFO] Installing dependencies..."
    npm install
}

Write-Host "[INFO] Checking ports..."
$backendPort = 3000
$frontendPort = 8080
$envFilePath = Join-Path $PSScriptRoot '.env'
$dbHost = Get-EnvValue -FilePath $envFilePath -Key 'DB_HOST'
$dbPort = Get-EnvValue -FilePath $envFilePath -Key 'DB_PORT'

if (-not $dbPort) {
    $dbPort = '3306'
}

if (Get-NetTCPConnection -LocalPort $backendPort -ErrorAction SilentlyContinue) {
    Write-Host "[WARNING] Port $backendPort [Backend] is already in use." -ForegroundColor Yellow
}

if (Get-NetTCPConnection -LocalPort $frontendPort -ErrorAction SilentlyContinue) {
    Write-Host "[WARNING] Port $frontendPort [Frontend] is already in use." -ForegroundColor Yellow
}

if (-not $dbHost) {
    Write-Host "[WARNING] .env is missing DB_HOST. Backend and frontend will still start, but DB calls will fail until DB settings are fixed." -ForegroundColor Yellow
}
else {
    Write-Host "[INFO] Checking external DB reachability..."
    $dbReachable = Test-TcpPortFast -HostName $dbHost -Port ([int]$dbPort)
    if ($dbReachable) {
        Write-Host "[INFO] External DB reachable: $dbHost`:$dbPort"
    }
    else {
        Write-Host "[WARNING] External DB is unreachable: $dbHost`:$dbPort" -ForegroundColor Yellow
        Write-Host "[WARNING] Backend and frontend will still start, but DB-backed screens and APIs may fail." -ForegroundColor Yellow
    }
}

Write-Host ""
Write-Host "[INFO] Starting Backend [Port: 3000]..."
Start-Process cmd -ArgumentList "/k npm run server"

Write-Host "[INFO] Starting Frontend [Port: 8080]..."
Start-Process cmd -ArgumentList "/k npm run dev"

Write-Host ""
Write-Host "============================================" -ForegroundColor Green
Write-Host " [OK] Server commands issued successfully." -ForegroundColor Green
Write-Host " [INFO] Please check the new windows for logs."
Write-Host "============================================" -ForegroundColor Green
Write-Host ""

Read-Host "Press Enter to continue..."