<#
.SYNOPSIS
    Checking privileged rights

.DESCRIPTION
    Returning current username if privileged rights are exist
    or
    returning error, if privileged rights are not exist

.PARAMETER show
    ""   - execution with pauses.
    "qn" - execution without pauses.

.PARAMETER conf
    Path to configuration file. ".\script.conf" is the default.

.EXAMPLE
    .\script.ps1

.EXAMPLE
    .\script.ps1 qn .\script.conf
#>


param (
    [Parameter(Mandatory=$false,Position=0)][System.String]$show="",
    [Parameter(Mandatory=$false,Position=1)][System.String]$conf=""
)


class Config {
    [System.String] $path
    [System.String] $logs

    Config([System.String]$confpath) {
        $this.path = $confpath
        $this.Read()
    }

    [System.Void] hidden Read() {
        $ErrorActionPreference = 'SilentlyContinue'
        Try{
            $this.logs = (Get-Content $this.path | Where-Object {$_ -like "logs=*"}).Split("=")[1]
        }
        Catch{
            $this.logs = $null
        }
        $ErrorActionPreference = 'Continue'
    }
}

class Logger {
    [System.String] $path

    Logger([System.String]$logspath) {
        $this.path = $logspath
        $ErrorActionPreference = 'SilentlyContinue'
        Try{
            if (!([string]::IsNullOrEmpty($this.path)) -and !(Test-Path -Path $this.path)) {
                New-Item -Path $this.path -ItemType File
            }
        }
        Catch{
        }
        $ErrorActionPreference = 'Continue'
    }

    [System.Void] Add ([System.String]$message) {
        $timenow = (Get-Date).toString("yyyy.MM.dd-HH:mm:ss")
        $ErrorActionPreference = 'SilentlyContinue'
        try {
            Add-Content $this.path -Value "$timenow $message"
        }
        catch {
        }
        finally {
            Write-Host "$timenow $message"
        }
        $ErrorActionPreference = 'Continue'
    }
}
function Execpause {
    Write-Host 'Press any key to continue...'
    $null = $Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown')
}
function Execquite {
    param (
        [Parameter(Mandatory=$false,Position=0)][System.Int32]$exitcode=0
    )
    if ($show -ne "qn") {
        Execpause
    }
    $logger.Add("execution time is $((Get-Date).Second-$tStart) seconds, exit")
    Set-Location -Path $dStart
    $host.SetShouldExit($exitcode)
    Exit
}
function Execerror {
    param (
        [Parameter(Mandatory=$false,Position=0)][System.String]$message=""
    )
    $logger.Add("error: $message")
    Execquite(1)
}


$tStart = $(Get-Date).Second
$dStart = $(Get-Location)
Set-Location -Path $PSScriptRoot
if ([string]::IsNullOrEmpty($conf)) {
    $conf = $PSCommandPath.Replace('.ps1','.conf')
}
$config = New-Object Config -ArgumentList $conf
$logger = New-Object Logger -ArgumentList $config."logs"


$currentPrincipal = New-Object Security.Principal.WindowsPrincipal([Security.Principal.WindowsIdentity]::GetCurrent())
if ($currentPrincipal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)) {
    Write-Host "Running as $env:USERNAME"
    Execquite(0)
}
else {
    Execerror("Restart this as Administrator!")
}