param()

$ErrorActionPreference = "Stop"

$portStart = $env:QORTAL_PORT_START
if ([string]::IsNullOrWhiteSpace($portStart)) {
    $portStart = 23391
}
if (-not ($portStart -match '^\d+$')) {
    Write-Error "Invalid port start '$portStart'."
    exit 1
}

$portStart = [int]$portStart
$apiPort = $portStart
$listenPort = $portStart + 1
$devProxyPort = $portStart + 2
$listenDataPort = $portStart + 3
$setPorts = $portStart -ne 23391

$settingsPath = "settings.json"
if (-not (Test-Path $settingsPath)) {
    Write-Host "settings.json not found. Downloading default settings.json..."
    $url = "https://cloud.qortal.org/s/QortalDevNetDefaultSettingsFile/download/default-settings.json"
    Invoke-WebRequest -Uri $url -OutFile $settingsPath
    Write-Host "Downloaded default settings.json"
}

function Get-PublicIp {
    $urls = @(
        "https://api.ipify.org",
        "https://ipv4.icanhazip.com",
        "https://checkip.amazonaws.com",
        "https://ifconfig.me",
        "https://canhazip.com"
    )
    foreach ($url in $urls) {
        try {
            $ip = (Invoke-WebRequest -Uri $url -TimeoutSec 8 -Headers @{ "User-Agent" = "Mozilla/5.0" }).Content.Trim()
            if ($ip -match '^\d{1,3}(\.\d{1,3}){3}$') {
                return $ip
            }
        } catch {
            continue
        }
    }
    return $null
}

$publicIp = Get-PublicIp
if (-not $publicIp) {
    Write-Warning "Could not obtain a valid public IPv4 address; please manually set 'ourExternalIpAddress' (find it at https://www.whatismyipaddress.com)."
    exit 0
}

$json = Get-Content -Raw -Path $settingsPath | ConvertFrom-Json
$json.ourExternalIpAddress = $publicIp

if ($setPorts) {
    $json.apiPort = $apiPort
    $json.listenPort = $listenPort
    $json.devProxyPort = $devProxyPort
    $json.listenDataPort = $listenDataPort
}

$json | ConvertTo-Json -Depth 20 | Set-Content -Encoding UTF8 -Path $settingsPath
if ($setPorts) {
    Write-Host "Successfully updated settings.json with ourExternalIpAddress=$publicIp and ports $apiPort-$listenDataPort."
} else {
    Write-Host "Successfully updated settings.json with ourExternalIpAddress=$publicIp."
}