############################## GLOBALS ##############################

$global:debug = 0
$global:display = 'Normal'
$global:title = 'Ganian App'
$global:args = $args

############################## VARIABLES ##############################

$domain	= 'ganian'
$vpn_ip	= '26.235.25.211'

############################## MAIN CODE ##############################

function main {
	run_as_admin

	show_title $global:title -set_title
	
	"`n`n`t Αρχείο διευθύνσεων Windows:"
	$hosts = @{
		path        = "$env:WINDIR\System32\drivers\etc\hosts"
		content     = $NULL
		old_content	= $NULL
		differences	= $NULL
	}
	$hosts.content = $hosts.old_content = Get-Content $hosts.path
	
	$domains_with_ip = $hosts.content -Match $domain -Match $vpn_ip
	if ($domains_with_ip.count -eq 0) {
		list_item 'Προσθήκη νέας διεύθυνσης...'
		$hosts.content += "`n$vpn_ip   $domain"
		check_mark
	}
	
	$domains_without_ip = $hosts.content -Match $domain -NotMatch $vpn_ip
	if ($domains_without_ip.count -gt 0) {
		list_item 'Αφαίρεση παλαιών διευθύνσεων...'
		$hosts.content = $hosts.content -Replace ($domains_without_ip -join '|'), ''
		check_mark
	}
	
	$hosts.differences = Compare-Object $hosts.content $hosts.old_content
	if ($NULL -ne $hosts.differences) {
		list_item 'Αποθήκευση...'
		$hosts.content -join "`n" -replace '\n{3,}', "`n`n" | Out-File -Encoding ASCII $hosts.path
		check_mark
	}
	
	"`n`n`n`t Εικονικό ιδιωτικό δίκτυο Radmin:"
	$radmin = @{
		path     = "${env:ProgramFiles(x86)}\Radmin VPN\RvRvpnGui.exe"
		url      = 'https://www.radmin-vpn.com/'
		download	= "$env:TMP/radmin_vpn.exe"
	}
	
	if (-Not (Test-Path $radmin.path)) {
		list_item 'Λήψη...'
		$radmin_page = Invoke-RestMethod $radmin.url
		$download_url = ($radmin_page | Select-String "<a href=""(.*?)"" class=""buttonDownload""").Matches.Groups[1].Value
		$ProgressPreference = "SilentlyContinue"
		Start-BitsTransfer -Source $download_url -Destination $radmin.download -DisplayName 'Λήψη...'
		check_mark
		
		list_item 'Εγκατάσταση...'
		Start-Process $radmin.download '/VERYSILENT /NORESTART' -Wait
		check_mark
		
		list_item 'Διαγραφή λήψης...'
		Remove-Item $radmin.download
		check_mark
	}
	
	if (Test-Path $radmin.path) {
		list_item 'Εκκίνηση...'
		Start-Process $radmin.path '/show'
		check_mark
	}
	
	Write-Host -NoNewLine "`n`n`n`t Άνοιγμα πρoγράμματος περιήγησης... "
	Start-Process "http://$domain"
	check_mark
	
	finish_gr
}

############################## FUNCTIONS ##############################

function run_as_admin {
	$has_admin_rights = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] 'Administrator')
	if (-not $has_admin_rights) {
		Start-Process 'powershell' '-NoProfile -ExecutionPolicy Bypass', $(if ($NULL -ne $PSCommandPath) { "-File `"$PSCommandPath`" $global:args" } else { $MyInvocation.MyCommand.Definition -replace '"', "'" }) -WorkingDirectory $pwd -Verb 'RunAs' -WindowStyle $(if ($global:debug) { 'Normal' } else { $global:display })
		if ($global:debug) { pause }
		exit
	}
}

function show_title {
	param (
		[Parameter(Mandatory)] [string] $title,
		[switch] $set_title
	)
	
	if ($set_title) { $Host.UI.RawUI.WindowTitle = $title }
	Write-Host "`n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  $title  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
}

function list_item {
	param (
		[Parameter(Mandatory)] [string] $text,
		[string] $symbol = '•'
	)
	
	Write-Host -NoNewLine -ForegroundColor Gray "`n`t $symbol $text "
}

function check_mark {
	param (
		[string] $symbol = '√',
		[string] $color = 'Green'
	)
	
	Write-Host -ForegroundColor $color $symbol
}
function finish_gr {
	param (
		[string] $title = 'Η διαδικασία ολοκληρώθηκε',
		[switch] $restart
	)
	
	''
	show_title $title
	[system.media.systemsounds]::Beep.play()

	if ($restart) {
		Write-Host -ForegroundColor Yellow -NoNewline "`n`n`t`t Απαιτείται επανεκκίνηση, επανεκκίνηση τώρα? [ν/ο] "
		do {
			$user_choice = [console]::ReadKey($TRUE).Key
		} until (@('Ν', 'Ο') -contains $user_choice)

		if ($user_choice -eq 'Ν') {
			Start-Process 'shutdown' '/t /t 0'
		}
	}
	else {
		Write-Host -ForegroundColor Yellow "`n`n`t`t`t (Πατήστε οποιδήποτε πλήκτρο για να εξέλθετε)"
		$NULL = [Console]::ReadKey($TRUE)
	}
	
	exit
}

############################## RUN MAIN CODE ##############################

main