#!/usr/bin/perl
use strict;
use WWW::Mechanize;
use Win32::OLE qw(in with);
use Win32::OLE::Const 'Microsoft Excel';

$Win32::OLE::Warn = 3;                                # die on errors...

# get already active Excel application or open new
my $Excel = Win32::OLE->GetActiveObject('Excel.Application')
    || Win32::OLE->new('Excel.Application', 'Quit');  

# open Excel file
my $Book = $Excel->Workbooks->Open("C:/Documents and Settings/rto5u/My Documents/CV.xls"); 

# select worksheet number 1 (you can also select a worksheet by name)
my $Sheet = $Book->Worksheets(1);

foreach my $row (2..4)
{
    foreach my $col (1..1)
    {
        # skip empty cells
        next unless defined $Sheet->Cells($row,$col)->{'Value'};

		my $URL = 'http://scholar.google.com/advanced_scholar_search';
		my $FORM_NAME = 'f';
		#print "Author Name: ";
		#chomp ($AUTHOR = <>);
		my $AUTHOR = "MD Li";
		print "Author Name: $AUTHOR\n";
		#print "Paper Title: ";
		#chomp ($TITLE = <>);
		my $TITLE = $Sheet->Cells($row,$col)->{'Value'};
		print "Paper Title: $TITLE\n";
		#print "$TITLE";
		#my $TITLE = "Region-specific transcriptional response to chronic nicotine in rat brain";

		my $mech = WWW::Mechanize->new(stack_depth=>10);

		$mech->get($URL) || die ("Could not connect to $URL.\n");

		my $res = $mech->submit_form(
			form_name => $FORM_NAME,
			fields => {
				'num' => 100,
				'as_epq' => $TITLE,
				'as_occt' => 'title',
				'as_sauthors' => $AUTHOR,
				'as_allsubj' => 'all',
			},
		);

		while ($res && $res->is_success()){
			my $content = $res->content;
			#print $content;
			while ($content =~ /<p class=g>(.*?)<\/font>\s\s\s/gs){
				my $section = $1;
			
				my $title	= "";
				my $citedby	= 0;

				# get title
				$title = getTitle($section);
				$title =~ s/<.*?>//g;
				$title =~ s/&hellip;/\.\.\./g;
	
				# get citedby #
				$citedby = getCitedBy($section);
		
				if ($citedby){
					print "\"$title\"\nCited by: $citedby\n\n";
				}
			}
			$res = $mech->follow_link( text_regex => qr/Next/i);
		}
	}
}

$Book->Close;
#############################################################################

sub getTitle($){
	my ($section) = @_;
	my $title;

	if ($section =~ /<span class="w">.*?<a href.*?>(.*?)<\/a><\/span>/s){ 	# papers with a link
		$title = $1;
		
	}elsif ($section =~ /&nbsp;(.*?)<font size=-1>/s){			# papers w/o a link
		$title = $1;
	}else{
		$title = $1;
	}
	return $title;
}

#----------------------------------------------------------------------------
sub getCitedBy($){
	my ($section) = @_;
	my $citedby;

	if ($section =~ />Cited by (\d+)</s){
		$citedby = $1;
	}
	return $citedby;
}

#----------------------------------------------------------------------------