[CmdletBinding()]
param(
  [switch]$Compile
)

$ErrorActionPreference = 'Stop'
$workspace = Split-Path -Parent $MyInvocation.MyCommand.Path
$launcherDir = Join-Path $workspace 'mikrotik\launcher'
$issPath = Join-Path $workspace 'NetworkCustomers_latest.iss'

if ($Compile) {
  $csc = 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe'
  if (-not (Test-Path -LiteralPath $csc)) {
    throw 'The .NET Framework C# compiler was not found.'
  }
  $launcherSource = Join-Path $launcherDir 'AgentPortalLauncher.cs'
  $updateSource = Join-Path $launcherDir 'ClientUpdateManager.cs'
  $launcherOutput = Join-Path $launcherDir 'AgentPortalLauncher.final.exe'
  $compilerArgs = @(
    '/nologo', '/target:winexe', '/platform:x86', '/optimize+',
    ('/win32icon:' + (Join-Path $launcherDir 'NetworkCustomers.ico')),
    ('/out:' + $launcherOutput),
    '/reference:System.dll', '/reference:System.Core.dll',
    '/reference:System.Drawing.dll', '/reference:System.Windows.Forms.dll',
    '/reference:System.Web.Extensions.dll', '/reference:System.IO.Compression.dll',
    '/reference:System.IO.Compression.FileSystem.dll',
    ('/reference:' + (Join-Path $launcherDir 'Microsoft.Web.WebView2.Core.dll')),
    ('/reference:' + (Join-Path $launcherDir 'Microsoft.Web.WebView2.WinForms.dll')),
    $launcherSource, $updateSource
  )
  & $csc @compilerArgs
  if ($LASTEXITCODE -ne 0) { throw "Launcher compilation failed with exit code $LASTEXITCODE" }
  Copy-Item -LiteralPath $launcherOutput -Destination (Join-Path $launcherDir 'AgentPortalLauncher.exe') -Force
  Write-Host 'Desktop launcher compiled explicitly for x86.' -ForegroundColor Green

  $versionText = Get-Content -LiteralPath (Join-Path $workspace 'mikrotik\admin\version.php') -Raw
  $versionMatch = [regex]::Match($versionText, "'version'\s*=>\s*'([^']+)'", 'IgnoreCase')
  if (-not $versionMatch.Success) { throw 'Unable to read the application version.' }
  $clientPackageBuilder = Join-Path $workspace 'build_linked_client_update.ps1'
  $releaseVersion = $versionMatch.Groups[1].Value
  # 1.3.0 is the updater-capable foundation. Every later package is a
  # cumulative delta against this fixed baseline, so a client may safely skip
  # intermediate releases and still jump directly to the newest version.
  $foundationVersion = '1.3.0'
  $foundationBaseline = Join-Path $workspace ('mikrotik\admin\updates\distributed\baselines\' + $foundationVersion + '.json')
  $packageArgs = @{ Version = $releaseVersion; MinVersion = '1.2.9'; ReleaseId = ('desktop-' + $releaseVersion) }
  if ($releaseVersion -ne $foundationVersion -and (Test-Path -LiteralPath $foundationBaseline)) {
    $packageArgs.MinVersion = $foundationVersion
    $packageArgs.BaselineManifest = $foundationBaseline
  }
  & $clientPackageBuilder @packageArgs
}

function Get-PeArchitecture([string]$Path) {
  if (-not (Test-Path -LiteralPath $Path)) {
    throw "Missing required runtime file: $Path"
  }
  $bytes = [IO.File]::ReadAllBytes($Path)
  if ($bytes.Length -lt 64) { throw "Invalid PE file: $Path" }
  $peOffset = [BitConverter]::ToInt32($bytes, 0x3c)
  if ($peOffset -lt 0 -or ($peOffset + 6) -ge $bytes.Length) {
    throw "Invalid PE header: $Path"
  }
  $machine = [BitConverter]::ToUInt16($bytes, $peOffset + 4)
  switch ($machine) {
    0x014c { return 'x86' }
    0x8664 { return 'x64' }
    0xaa64 { return 'arm64' }
    default { return ('unknown-0x{0:X4}' -f $machine) }
  }
}

$runtimeFiles = @(
  (Join-Path $launcherDir 'AgentPortalLauncher.final.exe'),
  (Join-Path $launcherDir 'OutputDeviceAgent.x86.exe'),
  (Join-Path $launcherDir 'WebView2Loader.dll')
)

$architectures = foreach ($file in $runtimeFiles) {
  [PSCustomObject]@{
    File = [IO.Path]::GetFileName($file)
    Architecture = Get-PeArchitecture $file
  }
}

$wrong = @($architectures | Where-Object Architecture -ne 'x86')
if ($wrong.Count -gt 0) {
  $details = ($wrong | ForEach-Object { "$($_.File)=$($_.Architecture)" }) -join ', '
  throw "The desktop runtime must be entirely x86. Found: $details"
}

$architectures | Format-Table -AutoSize
Write-Host 'Desktop runtime architecture check passed.' -ForegroundColor Green

if ($Compile) {
  $isccCandidates = @(
    'C:\Program Files (x86)\Inno Setup 6\ISCC.exe',
    'C:\Program Files\Inno Setup 6\ISCC.exe'
  )
  $iscc = $isccCandidates | Where-Object { Test-Path -LiteralPath $_ } | Select-Object -First 1
  if (-not $iscc) { throw 'Inno Setup 6 compiler was not found.' }
  & $iscc $issPath
  if ($LASTEXITCODE -ne 0) { throw "Inno Setup failed with exit code $LASTEXITCODE" }
}