#!/usr/bin/perl -w


use strict; 

use CGI::Carp qw(fatalsToBrowser); 
use CGI; 

my $gsdl_cgi;
my $gsdl_tmp_dir;

BEGIN {
    
    $|=1; # Force auto-flushing for output

    eval('require "./gsdlCGI.pm"');
    if ($@)
    {
	print STDOUT "Content-type:text/plain\n\n";
	print STDOUT "ERROR: $@\n";
	exit 0;
    }

}


sub monitor_upload 
{            
    my ($filename, $buffer, $bytes_read, $data) = @_;
    
    $bytes_read ||= 0; 

    my $full_filename = &util::filename_cat($gsdl_tmp_dir,
					    "$filename-progress.txt");
      
    open(COUNTER, ">$full_filename"); 
    
    my $per = 0; 
    if($ENV{CONTENT_LENGTH} >  0){ 
        $per = int(($bytes_read * 100) / $ENV{CONTENT_LENGTH});
    }
    print COUNTER $per;
    close(COUNTER); 
    
    # Useful debug to slow down a 'fast' upload
    # Sleep for 10 msecs
    #select(undef, undef, undef, 0.01);
}



sub upload_file { 

    my ($gsdl_cgi,$full_filename) = @_;
    
    my $fh       = $gsdl_cgi->upload('uploadedfile');
    my $filename = $gsdl_cgi->param('uploadedfile');
    
    return '' if ! $filename;     
    
    open (OUTFILE, '>' . $full_filename) 
        || die("Can't write to $full_filename: $!");        

    binmode(OUTFILE);

    while (my $bytesread = read($fh, my $buffer, 1024)) { 
        print OUTFILE $buffer; 
    } 
    
    close (OUTFILE);
    chmod(0666, $full_filename);  
    
}

sub remove_progress_file 
{ 
    my ($file) = @_;

    $file =~ s{^(.*)\/}{}; 

    my $progress_filename = &util::filename_cat($gsdl_tmp_dir,
						"$file-progress.txt");

    if (!unlink($progress_filename)) {
	print STDERR "Warning: Failed to delete $progress_filename\n"; 
    }
}


sub main { 

    # gsdlCGI->prenew() constructs a 'lite' version of the object where the
    # GSDL environment has been setup
    #
    # This is needed because the main call the gsdlCGI->new takes an 
    # initializer rountine -- monitor_upload() -- as a parameter, AND THAT 
    # routine (which is called before the constructor is finished) needs to 
    # know the tmp directory to use to write out the progress file.

    my $gsdl_config = gsdlCGI->prenew();
    $gsdl_tmp_dir = &util::get_toplevel_tmp_dir();

    require talkback;

    # Use the initializer mechanism so a 'callback' routine can monitor
    # the progress of how much data has been uploaded

    $gsdl_cgi = gsdlCGI->new(\&monitor_upload); 


    require CGI::Ajax;

    my $perlAjax = new CGI::Ajax('check_status' => \&check_status);


    if ($gsdl_cgi->param('process')) { 

	my $rand_string  = $gsdl_cgi->param('rand_string');
	my $uploadedfile = $gsdl_cgi->param('uploadedfile');
	my $full_filename = &util::filename_cat($gsdl_tmp_dir,
						"$rand_string-$uploadedfile");

	my $done_html = &talkback::generate_done_html($full_filename);

        if ($gsdl_cgi->param('yes_upload')) { 
            upload_file($gsdl_cgi,$full_filename); 
        }   

        print $gsdl_cgi->header(); 
        print $done_html; 

        remove_progress_file($gsdl_cgi->param('uploadedfile'));   
    }
    else {         

	my $upload_html_form;

	if (defined $gsdl_cgi->param('rand_string')) { 
	    my $rand_string = $gsdl_cgi->param('rand_string');

	    # Light-weight (hidden) form with progress bar

	    $upload_html_form 
		= &talkback::generate_upload_form_progressbar($rand_string);
	}
	else {
	    print STDERR "Warning: Neither 'processing' nor 'rand_string' was set\n";
	    $upload_html_form 
		= &talkback::generate_malformed_args_html();
	    
	}
	
        print $perlAjax->build_html($gsdl_cgi, $upload_html_form);
    }
}


main(); 

#=====

# accessed from HTML web page through perlAjax 

sub check_status { 
   
    my $filename = $gsdl_cgi->param('uploadedfile');
    $filename =~ s{^(.*)\/}{}; 

    my $wait_filename = &util::filename_cat($gsdl_tmp_dir,"wait.txt");
    open(WIN,"<$wait_filename");
    my $wait = <WIN>;
    close(WIN);

    $wait = ($wait+1) %6;
    my $wait_dots = "." x ($wait+1);

    open(WOUT,">$wait_filename");
    print WOUT "$wait\n";
    close(WOUT);

    my $monitor_filename = "$gsdl_tmp_dir/$filename-progress.txt";

    if (! -f  $monitor_filename ) {

	return $wait_dots;
    }
        
        
    open my $PROGRESS, '<', $monitor_filename or die $!;
    my $s = do { local $/; <$PROGRESS> };
    close ($PROGRESS); 
    
    my $small = 300 - ($s * 3); 
    my $big = $s * 3; 
   
    my $r = "$wait_dots ";
    $r .= '<div style="width:' . $big . 'px;height:10px;background-color:#dddd00;float:left"></div>'; 
    $r .= '<div style="width:' . $small . 'px;height:10px;background-color:#008000;float:left"></div>';
    $r .= '<div style="float:left;width: 80px">&nbsp;' . $s . '%</div>'; 

    return $r; 
    
}