param
(
[string]$board="b",
[string]$tnum="-1",
[string]$sp="e:/pic_dir/"
)

$sp += "$board-$tnum"
$thread_path = "https://2ch.hk/$board/res/$tnum.html"
$linq_query = "*/src/*"
$pics_count = 0
$pics_size = 0.0

$pics_links = ( ( Invoke-WebRequest -Uri $thread_path ).Links | Where outerHTML -like $linq_query ).href


if( $pics_links.Count -gt 0 )
{
    if( ( Test-Path $sp ) -eq 0 )
    {
        mkdir $sp
    }

    $elapsed = [System.Diagnostics.Stopwatch]::StartNew()

    For( $i = 0; $i -lt $pics_links.Count; $i++ )
    {
         $file_name = $pics_links[$i].Substring( $pics_links[$i].LastIndexOf("/") + 1 )

         if( ( Test-Path ( "$sp/$file_name" ) ) -eq 0 )
         {
         	$pics_links[$i] = "https://2ch.hk" + $pics_links[$i]
                Start-BitsTransfer $pics_links[$i] $sp
                $pics_count += 1
                $pics_size += ( Get-Item "$sp/$file_name" ).Length / 1024
         }
    }

    $pics_size /= 1024
    Write-Host ( "Total downloaded content: $pics_count" )
    Write-Host ( "Total size: {0:N2} Mb " -f $pics_size )
    Write-Host ( "Total elapsed time: $( $elapsed.Elapsed.ToString() )" )
}
else
{
    Write-Host "No content in $thread_path or thread 404'd"
}