<#
.SYNOPSIS
    Launches the pymodbus simulator with one of the integration-test profiles
    (Standard or DL205). Foreground process — Ctrl+C to stop.

.PARAMETER Profile
    Which simulator profile to run: 'standard' or 'dl205'. Both bind TCP 5020 by
    default so they can't run simultaneously on the same box.

.PARAMETER HttpPort
    Port for pymodbus's optional web UI / REST API. Default 8080. Pass 0 to
    disable (passes --no_http).

.EXAMPLE
    .\serve.ps1 -Profile standard
    Starts the standard server on TCP 5020 with web UI on 8080.

.EXAMPLE
    .\serve.ps1 -Profile dl205 -HttpPort 0
    Starts the DL205 server on TCP 5020, no web UI.
#>
[CmdletBinding()]
param(
    [Parameter(Mandatory)] [ValidateSet('standard', 'dl205')] [string]$Profile,
    [int]$HttpPort = 8080
)

$ErrorActionPreference = 'Stop'
$here = $PSScriptRoot

# Confirm pymodbus.simulator is on PATH — clearer message than the
# 'CommandNotFoundException' dotnet style.
$cmd = Get-Command pymodbus.simulator -ErrorAction SilentlyContinue
if (-not $cmd) {
    Write-Error "pymodbus.simulator not found. Install with: pip install 'pymodbus[simulator]==3.13.0'"
    exit 1
}

$jsonFile = Join-Path $here "$Profile.json"
if (-not (Test-Path $jsonFile)) {
    Write-Error "Profile config not found: $jsonFile"
    exit 1
}

$args = @(
    '--modbus_server', 'srv',
    '--modbus_device', 'dev',
    '--json_file',     $jsonFile
)

if ($HttpPort -gt 0) {
    $args += @('--http_port', $HttpPort)
    Write-Host "Web UI will be at http://localhost:$HttpPort"
} else {
    $args += '--no_http'
}

Write-Host "Starting pymodbus simulator: profile=$Profile  TCP=localhost:5020"
Write-Host "Ctrl+C to stop."
& pymodbus.simulator @args