<#
.SYNOPSIS
    Copies overlay/ into a ServUO server root.

.DESCRIPTION
    overlay/ mirrors the server root exactly, so deployment is a straight file copy.
    Nothing is deleted from the server; this only adds or overwrites.

    Run with -Verify first. It reports what would change and touches nothing.

.EXAMPLE
    .\deploy.ps1 -ServerPath C:\Users\colby\Desktop\servuo -Verify
    .\deploy.ps1 -ServerPath C:\Users\colby\Desktop\servuo
#>
[CmdletBinding()]
param(
    [Parameter(Mandatory = $true)]
    [string] $ServerPath,

    [switch] $Verify
)

$ErrorActionPreference = 'Stop'

$overlay = Join-Path $PSScriptRoot 'overlay'

if (-not (Test-Path $overlay))    { throw "overlay/ not found next to deploy.ps1" }
if (-not (Test-Path $ServerPath)) { throw "server path not found: $ServerPath" }

# ServUO.exe holds a lock on Scripts.dll and writes Saves/ on exit. Never deploy under it.
if (Get-Process -Name ServUO -ErrorAction SilentlyContinue) {
    throw "ServUO is running. Stop it before deploying."
}

function Get-Sha([string] $path) {
    if (-not (Test-Path $path)) { return $null }
    return (Get-FileHash $path -Algorithm SHA256).Hash
}

$added = 0; $changed = 0; $same = 0

Get-ChildItem $overlay -Recurse -File | ForEach-Object {
    $rel = $_.FullName.Substring($overlay.Length + 1)
    $dst = Join-Path $ServerPath $rel

    $srcHash = Get-Sha $_.FullName
    $dstHash = Get-Sha $dst

    if ($null -eq $dstHash) {
        $state = 'ADD    '; $added++
    } elseif ($srcHash -ne $dstHash) {
        $state = 'CHANGE '; $changed++
    } else {
        $state = 'same   '; $same++
    }

    if ($state -ne 'same   ') {
        Write-Output "$state $rel"
    }

    if (-not $Verify -and $state -ne 'same   ') {
        $parent = Split-Path $dst -Parent
        if (-not (Test-Path $parent)) { New-Item -ItemType Directory -Force -Path $parent | Out-Null }
        Copy-Item $_.FullName -Destination $dst -Force
    }
}

Write-Output ""
if ($Verify) {
    Write-Output "VERIFY only. add=$added change=$changed unchanged=$same  (nothing written)"
} else {
    Write-Output "deployed. add=$added change=$changed unchanged=$same"
    Write-Output ""
    Write-Output "Scripts.csproj changed => next boot rebuilds Scripts.dll (Compiler.cfg Dynamic=True)."
}