[CmdletBinding()]
param(
    [Alias("h")]
    [switch]$Help,
    [string]$ListenHost = "127.0.0.1",
    [int]$Port = 3000,
    [string]$RootDir = ""
)

$ErrorActionPreference = "Stop"

function Write-Usage {
    @(
        'Usage:'
        '  ./server-rs/scripts/spacetime-dev.ps1'
        '  ./server-rs/scripts/spacetime-dev.ps1 -ListenHost 127.0.0.1 -Port 3101'
        ''
        'Notes:'
        '  1. Start local standalone SpacetimeDB for the Genarrative Rust backend'
        '  2. Store local SpacetimeDB state in server-rs/.spacetimedb/local by default'
        '  3. Default port is 3000 to align with the spacetime CLI local server alias'
        '  4. Current stage already has crates/spacetime-module scaffold, but still does not auto-publish the module'
    ) -join [Environment]::NewLine
}

if ($Help) {
    Write-Usage
    exit 0
}

$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$serverRsDir = Split-Path -Parent $scriptDir

if ([string]::IsNullOrWhiteSpace($RootDir)) {
    $RootDir = Join-Path $serverRsDir ".spacetimedb\local"
}

if (-not (Test-Path (Join-Path $serverRsDir "crates\spacetime-module\README.md"))) {
    throw "Missing server-rs/crates/spacetime-module/README.md, cannot start SpacetimeDB local dev script."
}

$spacetimeCommand = Get-Command spacetime -ErrorAction SilentlyContinue

if ($null -eq $spacetimeCommand) {
    throw @(
        "Missing 'spacetime' CLI.",
        "Install guide: https://spacetimedb.com/install",
        "Windows PowerShell: iwr https://windows.spacetimedb.com -useb | iex"
    ) -join " "
}

New-Item -ItemType Directory -Force -Path $RootDir | Out-Null

$listenAddress = "$ListenHost`:$Port"

Write-Host "[server-rs:spacetime-dev] working dir: $serverRsDir"
Write-Host "[server-rs:spacetime-dev] root dir: $RootDir"
Write-Host "[server-rs:spacetime-dev] listen addr: $listenAddress"
Write-Host "[server-rs:spacetime-dev] mode: standalone"
Write-Host "[server-rs:spacetime-dev] note: module scaffold already exists; publish remains manual in this stage"

Push-Location $serverRsDir
try {
    & $spacetimeCommand.Source --root-dir $RootDir start --edition standalone --listen-addr $listenAddress
}
finally {
    Pop-Location
}