function saveConfig {
    [IO.File]::WriteAllLines($config_file, ($cfg | ConvertTo-Json -Depth 100))
}

function loadConfig {
    $def_cfg = Get-Content $config_def_file | ConvertFrom-Json

    if (Test-Path -Path $config_file -PathType leaf) {
        $cfg = Get-Content $config_file | ConvertFrom-Json
        fill -cfg $cfg -def_cfg $def_cfg
    }

    return $def_cfg
}

function fill($cfg, $def_cfg) {
    foreach ($prop in $def_cfg.PsObject.Properties) {
        if ($prop.Value.GetType().Name -eq "PSCustomObject") {
            fill -cfg $cfg.$($prop.Name) -def_cfg $def_cfg.$($prop.Name)
        }
        else {
            if ($cfg.$($prop.Name) -ne $null) {
                $def_cfg.$($prop.Name) = $cfg.$($prop.Name)
            }
            elseif ($prop.Value -is [string] -and $prop.Value.StartsWith("#")) {
                $def_cfg.$($prop.Name) = getCustomVal -name $prop.Value

            }
        }
    }
}

function getCustomVal($name) {       
    $res = switch ($name) {
        "#desktop"      { [Environment]::GetFolderPath("Desktop") }
        "#microphone"   { (Get-AudioDevice -Recording).Name }
        "#background"   { "$root\res\fondo-1.jpg" }
    }
    return $res
}