param(
    [string]$GameDir = "D:\cbt1"
)

$ErrorActionPreference = 'Stop'
$dist = Join-Path $PSScriptRoot 'dist'

$clientExe = 'GenshinImpact.exe', 'YuanShen.exe' |
    Where-Object { Test-Path (Join-Path $GameDir $_) } | Select-Object -First 1

if (-not $clientExe) {
    throw "No Genshin client (GenshinImpact.exe / YuanShen.exe) found in $GameDir - pass -GameDir <path> to your client folder."
}
Write-Host "Client: $clientExe in $GameDir" -ForegroundColor DarkGray

$files = 'version.dll', 'gadget.dll', 'gadget.config', 'redirect.js'
foreach ($file in $files) {
    $source = Join-Path $dist $file
    if (-not (Test-Path $source)) { throw "missing $source - run build.ps1 first." }

    $target = Join-Path $GameDir $file
    if ((Test-Path $target) -and $file -eq 'version.dll') {
        Copy-Item $target "$target.bak" -Force
        Write-Host "backed up existing version.dll -> version.dll.bak" -ForegroundColor DarkGray
    }

    Copy-Item $source $target -Force
    Write-Host "deployed $file" -ForegroundColor Green
}

Write-Host ""
Write-Host "Patch deployed to $GameDir. Start the SDK server (:8899) and gameserver, then launch GenshinImpact.exe." -ForegroundColor Cyan
Write-Host "Check YuanshenPatch.log in the game folder to confirm the gadget loaded." -ForegroundColor Cyan