class RegistryService {

    static [string] $BasePath = "HKLM:\SOFTWARE\Policies\Mozilla\Firefox"
    static [string] $ExtPath  = "HKLM:\SOFTWARE\Policies\Mozilla\Firefox\ExtensionSettings"

    static [void] EnsureKey([string]$path) {
        if (-not (Test-Path $path)) { New-Item -Path $path -Force | Out-Null }
    }

    static [void] SetString([string]$path, [string]$name, [string]$value) {
        [RegistryService]::EnsureKey($path)
        Set-ItemProperty -Path $path -Name $name -Value $value -Type String
    }

    static [void] SetDWord([string]$path, [string]$name, [int]$value) {
        [RegistryService]::EnsureKey($path)
        Set-ItemProperty -Path $path -Name $name -Value $value -Type DWord
    }

    static [void] RemoveValue([string]$path, [string]$name) {
        Remove-ItemProperty -Path $path -Name $name -ErrorAction SilentlyContinue
    }

    static [void] RemoveKey([string]$path) {
        if (Test-Path $path) { Remove-Item -Path $path -Recurse -Force }
    }

    static [void] DeployAddon([AddonModel]$addon) {
        $key = Join-Path ([RegistryService]::ExtPath) $addon.Id
        [RegistryService]::SetString($key, "installation_mode", "force_installed")
        if ($addon.InstallUrl) {
            [RegistryService]::SetString($key, "install_url", $addon.InstallUrl)
        }
    }

    static [void] BlockAddon([string]$addonId) {
        $key = Join-Path ([RegistryService]::ExtPath) $addonId
        [RegistryService]::SetString($key, "installation_mode", "blocked")
    }

    static [void] SetWildcard([string]$mode) {
        $key = Join-Path ([RegistryService]::ExtPath) "*"
        [RegistryService]::SetString($key, "installation_mode", $mode)
    }

    static [void] RemoveJsonString() {
        [RegistryService]::RemoveValue([RegistryService]::BasePath, "ExtensionSettings")
    }

    static [hashtable] GetExtensionSettings() {
        $result = @{}
        if (-not (Test-Path ([RegistryService]::ExtPath))) { return $result }
        Get-ChildItem ([RegistryService]::ExtPath) -ErrorAction SilentlyContinue | ForEach-Object {
            $props = Get-ItemProperty $_.PSPath -ErrorAction SilentlyContinue
            $result[$_.PSChildName] = @{
                installation_mode = $props.installation_mode
                install_url       = $props.install_url
            }
        }
        return $result
    }

    static [string] GetValue([string]$path, [string]$name) {
        try {
            return (Get-ItemProperty $path -Name $name -ErrorAction Stop).$name
        } catch { return $null }
    }
}