# PowerShell Script to Reset Tailscale on Windows
# Works even if Tailscale service is not present

function Get-TailscalePath {
    $pathsToCheck = @(
        "$env:ProgramFiles\Tailscale\tailscale.exe",
        "${env:ProgramFiles(x86)}\Tailscale\tailscale.exe",
        "$env:LOCALAPPDATA\Tailscale\tailscale.exe"
    )
    foreach ($path in $pathsToCheck) {
        if (Test-Path $path) {
            return $path
        }
    }
    return $null
}

$tailscalePath = Get-TailscalePath

if (-not $tailscalePath) {
    Write-Warning "Tailscale CLI not found on this system. Skipping CLI commands..."
} else {
    Write-Host "Found Tailscale CLI at $tailscalePath"
    & "$tailscalePath" logout
}

# Stop service if exists
$service = Get-Service -Name "Tailscale" -ErrorAction SilentlyContinue
if ($service) {
    Write-Host "Stopping Tailscale service..."
    Stop-Service Tailscale -Force
} else {
    Write-Warning "Tailscale service not found, skipping stop."
}

# Remove ProgramData folder if present
$programDataPath = "C:\ProgramData\Tailscale"
if (Test-Path $programDataPath) {
    Remove-Item $programDataPath -Recurse -Force
    Write-Host "Removed folder: $programDataPath"
}

# Remove appdata folders
$localApp = "$env:LOCALAPPDATA\Tailscale"
$roamingApp = "$env:APPDATA\Tailscale"

foreach ($folder in @($localApp, $roamingApp)) {
    if (Test-Path $folder) {
        Remove-Item $folder -Recurse -Force
        Write-Host "Removed folder: $folder"
    }
}

# Set Headscale registry configuration
$registryPath = 'HKLM:\Software\Tailscale IPN'
New-Item -Path $registryPath -Force | Out-Null
New-ItemProperty -Path $registryPath -Name UnattendedMode -PropertyType String -Value "user-decides" -Force | Out-Null
New-ItemProperty -Path $registryPath -Name AllowIncomingConnections -PropertyType String -Value "never" -Force | Out-Null
New-ItemProperty -Path $registryPath -Name AdminConsole -PropertyType String -Value "hide" -Force | Out-Null
New-ItemProperty -Path $registryPath -Name NetworkDevices -PropertyType String -Value "hide" -Force | Out-Null
New-ItemProperty -Path $registryPath -Name TestMenu -PropertyType String -Value "hide" -Force | Out-Null
New-ItemProperty -Path $registryPath -Name LoginURL -PropertyType String -Value "http://headscale.estudiogroup.com:8080" -Force | Out-Null
Write-Host "Registry keys created successfully."

# Restart service if exists
if ($service) {
    Start-Service Tailscale
    Write-Host "Restarted Tailscale service"
}

# Show prefs if CLI was found
if ($tailscalePath) {
    & "$tailscalePath" debug prefs
}

Write-Host "`n✅ Tailscale reset complete. If you're using Headscale, run:"
Write-Host "`ttailscale up --login-server http://headscale.estudiogroup.com:8080"