[CmdletBinding()]
param(
    [switch]$BuildOnly,
    [switch]$SyncOnly,
    [string]$WorkRoot
)

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

$repositoryRoot = Split-Path -Parent $PSScriptRoot
$sourceApp = Join-Path $repositoryRoot 'flutter_app'
if (-not (Test-Path -LiteralPath (Join-Path $sourceApp 'pubspec.yaml') -PathType Leaf)) {
    throw "Flutter project was not found under '$sourceApp'."
}

$localAppData = [IO.Path]::GetFullPath($env:LOCALAPPDATA).TrimEnd('\')
$tempDirectory = [IO.Path]::GetFullPath($env:TEMP).TrimEnd('\')
if ([string]::IsNullOrWhiteSpace($WorkRoot)) {
    $WorkRoot = Join-Path $localAppData 'SovereignAI-Starter\windows-dev\flutter_app'
}
$workRootPath = [IO.Path]::GetFullPath($WorkRoot).TrimEnd('\')
$allowedRoots = @($localAppData, $tempDirectory)
$isAllowedRoot = $false
foreach ($allowedRoot in $allowedRoots) {
    if ($workRootPath.StartsWith($allowedRoot + '\', [StringComparison]::OrdinalIgnoreCase)) {
        $isAllowedRoot = $true
        break
    }
}
if (-not $isAllowedRoot) {
    throw 'WorkRoot must be a child directory of LOCALAPPDATA or TEMP.'
}

if (Test-Path -LiteralPath $workRootPath) {
    $workRootItem = Get-Item -LiteralPath $workRootPath -Force
    if (($workRootItem.Attributes -band [IO.FileAttributes]::ReparsePoint) -ne 0) {
        throw "Refusing to use a reparse-point work directory: $workRootPath"
    }
} else {
    New-Item -ItemType Directory -Path $workRootPath | Out-Null
}

$destinationAppPath = $workRootPath
if (-not (Test-Path -LiteralPath $destinationAppPath)) {
    New-Item -ItemType Directory -Path $destinationAppPath | Out-Null
}
$destinationAppPath = (Resolve-Path -LiteralPath $destinationAppPath).Path
$destinationItem = Get-Item -LiteralPath $destinationAppPath -Force
if (($destinationItem.Attributes -band [IO.FileAttributes]::ReparsePoint) -ne 0) {
    throw "Refusing to mirror source into a reparse-point directory: $destinationAppPath"
}

if (-not $SyncOnly) {
    $runningApps = @(Get-Process -Name 'flutter_app' -ErrorAction SilentlyContinue)
    if ($BuildOnly) {
        $runningApps = @($runningApps | Where-Object { $_.Path -and $_.Path.StartsWith($workRootPath + '\', [StringComparison]::OrdinalIgnoreCase) })
    }
    if ($runningApps.Count -gt 0) {
        $processIds = ($runningApps | ForEach-Object Id) -join ', '
        throw "Close the running Mithqal AI Debug window(s) first (PID: $processIds), then run this script again."
    }
}

# Keep native build outputs and package caches in the local copy for fast,
# incremental rebuilds. They are deliberately excluded from mirroring.
$excludedDirectories = @(
    (Join-Path $sourceApp 'build'),
    (Join-Path $sourceApp '.dart_tool'),
    (Join-Path $sourceApp 'windows\flutter\ephemeral'),
    (Join-Path $sourceApp 'linux\flutter\ephemeral'),
    (Join-Path $sourceApp 'macos\Flutter\ephemeral')
)
$excludedFiles = @(
    '.flutter-plugins',
    '.flutter-plugins-dependencies',
    '.packages',
    '.env',
    '.env.*'
)
& robocopy $sourceApp $destinationAppPath /MIR /XJ /R:1 /W:1 /NFL /NDL /NJH /NJS /NP /XD $excludedDirectories /XF $excludedFiles
if ($LASTEXITCODE -ge 8) {
    throw "Could not sync Flutter sources to the local build directory (robocopy $LASTEXITCODE)."
}
Write-Host "Local Windows build workspace: $destinationAppPath"

if ($SyncOnly) {
    exit 0
}

Push-Location $destinationAppPath
try {
    & flutter pub get --offline
    if ($LASTEXITCODE -ne 0) {
        throw 'Flutter dependencies are not available in the local pub cache. Run flutter pub get once with network access, then retry.'
    }

    if ($BuildOnly) {
        & flutter build windows --debug --no-pub
    } else {
        & flutter run -d windows --debug --no-pub
    }
    if ($LASTEXITCODE -ne 0) {
        throw "Flutter exited with code $LASTEXITCODE."
    }
} finally {
    Pop-Location
}