param(
    [string]$SourceRoot = (Resolve-Path (Join-Path $PSScriptRoot "..")).Path,
    [string]$DestinationRoot = "Q:\home\thomas\TuxDMXWebUI",
    [string]$StageRoot = (Join-Path $env:USERPROFILE "Desktop\TuxDMXWebUI-update"),
    [switch]$PackageOnly,
    [switch]$DryRun
)

Set-StrictMode -Version Latest
$ErrorActionPreference = "Stop"

function Write-Info {
    param([string]$Message)
    Write-Host "[TuxDMX] $Message"
}

function Invoke-Robocopy {
    param(
        [string]$Source,
        [string]$Destination,
        [string[]]$ExtraArguments = @()
    )

    $arguments = @(
        $Source,
        $Destination,
        "/E",
        "/R:2",
        "/W:1",
        "/FFT",
        "/XJ",
        "/NP",
        "/NDL"
    ) + $ExtraArguments

    if ($DryRun) {
        $arguments += "/L"
    }

    Write-Info ("robocopy " + ($arguments -join " "))
    & robocopy @arguments
    $exitCode = $LASTEXITCODE

    if ($exitCode -ge 8) {
        throw "Robocopy fejlede med exit code $exitCode."
    }
}

function Reset-Directory {
    param([string]$Path)

    if (Test-Path $Path) {
        Remove-Item -LiteralPath $Path -Recurse -Force
    }

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

$resolvedSource = (Resolve-Path $SourceRoot).Path

if (-not (Test-Path $resolvedSource)) {
    throw "Kildemappen findes ikke: $SourceRoot"
}

$excludedDirectories = @(
    ".git",
    ".github",
    ".venv",
    ".mypy_cache",
    ".pnpm-store",
    ".pytest_cache",
    ".ruff_cache",
    "node_modules",
    "data",
    "__pycache__"
)

$excludedFiles = @(
    "*.pyc",
    "*.pyo",
    "*.log"
)

$extraArguments = @()

if ($excludedDirectories.Count -gt 0) {
    $extraArguments += "/XD"
    $extraArguments += $excludedDirectories
}

if ($excludedFiles.Count -gt 0) {
    $extraArguments += "/XF"
    $extraArguments += $excludedFiles
}

Write-Info "Kilde: $resolvedSource"
Write-Info "Maal: $DestinationRoot"
Write-Info "Ekskluderer data, dependencies, caches og git-metadata."
Write-Info "Fallback-pakke: $StageRoot"

$syncFailed = $false

if (-not $PackageOnly) {
    if (-not (Test-Path $DestinationRoot)) {
        Write-Info "Maalmappe findes ikke, opretter: $DestinationRoot"
        New-Item -ItemType Directory -Force -Path $DestinationRoot | Out-Null
    }

    try {
        Invoke-Robocopy -Source $resolvedSource -Destination $DestinationRoot -ExtraArguments $extraArguments
    } catch {
        $syncFailed = $true
        Write-Info "Direkte sync til share fejlede: $($_.Exception.Message)"
        Write-Info "Bygger i stedet en lokal update-pakke med de deploy-klare filer."
    }
}

$distSource = Join-Path $resolvedSource "frontend\dist"
if (-not (Test-Path $distSource)) {
    Write-Info "Advarsel: frontend/dist findes ikke endnu. Koer frontend build foer deployment, hvis UI-assets skal med."
}

if ($PackageOnly -or $syncFailed) {
    if (-not $DryRun) {
        Reset-Directory -Path $StageRoot
    }

    Invoke-Robocopy -Source $resolvedSource -Destination $StageRoot -ExtraArguments $extraArguments

    if ($DryRun) {
        Write-Info "Dry-run af lokal update-pakke afsluttet uden at skrive filer."
    } else {
        Write-Info "Lokal update-pakke er klar: $StageRoot"
        Write-Info "Kopier indholdet herfra over paa Linux-maskinen med de rettigheder du har."
    }
} elseif ($DryRun) {
    Write-Info "Dry-run afsluttet uden at skrive filer."
} else {
    Write-Info "Synk afsluttet direkte til share."
}