param(
    [string]$OutputDir = "runs/win-helper",
    [string]$Configuration = "Release",
    [ValidateSet("anycpu", "x86", "x64")]
    [string]$Platform = "anycpu"
)

$ErrorActionPreference = "Stop"

$repo = Resolve-Path -LiteralPath (Join-Path $PSScriptRoot "..")
$sourceDir = Join-Path $repo "native/ISphereWinHelper"
$outDirPath = Join-Path $repo $OutputDir
$outExe = Join-Path $outDirPath "ISphereWinHelper.exe"

if (-not (Test-Path -LiteralPath $sourceDir)) {
    throw "source directory not found: $sourceDir"
}

$candidates = @(
    "$env:WINDIR\Microsoft.NET\Framework64\v4.0.30319\csc.exe",
    "$env:WINDIR\Microsoft.NET\Framework\v4.0.30319\csc.exe"
)
$csc = $candidates | Where-Object { Test-Path -LiteralPath $_ } | Select-Object -First 1
if (-not $csc) {
    throw ".NET Framework csc.exe v4.0.30319 not found"
}

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

$sources = Get-ChildItem -LiteralPath $sourceDir -Filter '*.cs' | Sort-Object Name | ForEach-Object { $_.FullName }
if (-not $sources) {
    throw "no C# sources found in $sourceDir"
}

$referenceRoots = @(
    "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.8",
    "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.7.2",
    "$env:WINDIR\Microsoft.NET\Framework64\v4.0.30319\WPF",
    "$env:WINDIR\Microsoft.NET\Framework\v4.0.30319\WPF"
)
function Resolve-Reference([string]$name) {
    foreach ($root in $referenceRoots) {
        $candidate = Join-Path $root $name
        if (Test-Path -LiteralPath $candidate) {
            return $candidate
        }
    }
    return $name
}

$uiaClient = Resolve-Reference "UIAutomationClient.dll"
$uiaTypes = Resolve-Reference "UIAutomationTypes.dll"
$windowsBase = Resolve-Reference "WindowsBase.dll"

& $csc `
    /nologo `
    /target:exe `
    /platform:$Platform `
    /optimize+ `
    /warn:0 `
    /out:$outExe `
    /reference:System.dll `
    /reference:System.Core.dll `
    /reference:System.Web.Extensions.dll `
    /reference:System.Windows.Forms.dll `
    /reference:$uiaClient `
    /reference:$uiaTypes `
    /reference:$windowsBase `
    $sources

if ($LASTEXITCODE -ne 0) {
    throw "win helper compilation failed with exit code $LASTEXITCODE"
}

$result = [ordered]@{
    ok = $true
    configuration = $Configuration
    platform = $Platform
    csc = $csc
    source_dir = $sourceDir
    output = $outExe
}
$result | ConvertTo-Json -Depth 4 -Compress