#!/usr/bin/perl -w
#

require 5.0;
use strict;

# Configuration Variables
# p4 command - requires a user with super access.
my $p4 = "C:\\Progra~1\\Perforce\\p4 -p localhost:1666 -u <super user name> -P <super user password>";
# filename used for temporary storage of change descriptions.
my $Scratchfile = "update";
# group name for "authorised updaters".
my $upgroup = "CDupdate";


# This subroutine assumes that the input job
# is an addendum.  The caller must check this.

sub process_job {
	my @job = @_;
       	my $Job;     			# Required data from the job
	my $User;
	my $Date;
	my $Chnum;
	my @changedesc;
        my $validaddendum = 0;
        my $fieldcounter = 0;	# need 4 more valid fields - count them (
        			# we know that the type field is
                                # addendum as that's assured by the caller,
                                # so that order in the form doesn't matter.
        foreach (@job) {                    # step through job description
        	if (!$validaddendum) {      # Gather data until we're sure
                			    # this is a valid addendum
			chomp ($_);
                	if ($_) {
        			my @fields = split;
                		if (($fields[0]) && ($fields[0] eq "Job:")) {
                                	$Job = $fields[1];
                                        $fieldcounter++;
				}
                		if (($fields[0]) && ($fields[0] eq "User:")) {
                                	$User = $fields[1];
                                        $fieldcounter++;
				}
                		if (($fields[0]) && ($fields[0] eq "Date:")) {
                                	$Date = join (" ", $fields[1], $fields[2]);
                                        $fieldcounter++;
				}
                		if (($fields[0]) && ($fields[0] eq "ChangeNumber:")){
					if ($fields[1]) {
                                		$Chnum = $fields[1];
                                	        $fieldcounter++;
					}
					else {
                                		return -1; # change num missing - abandon.
					}
				}
				if ($fieldcounter == 4) {
                                       	@changedesc = `$p4 change -o $Chnum`;
					open (UPDATE, ">$Scratchfile");
                                        print UPDATE @changedesc;
                                        print UPDATE "\tAppended by $User on $Date:\n"; 
                                        $fieldcounter++;  # don't repeat this step.
				}
                                if (($fields[0]) && ($fields[0] eq "Description:")){
                                	$validaddendum = 1;
				}
			}
        	}
		else {
                	print UPDATE "\t";
			print UPDATE $_;   # append the new data
                }
	}
       close UPDATE;
   
	if ($validaddendum) {	
        	# verify permissions - if OK, do the update.
                # Updates are authorised if the author
                # of the job is either the original author
                # of the change or is in the Changeupdates group.

                foreach (@changedesc) {
                	my @fields = split;
                	if (($fields[0]) && ($fields[0] eq "User:")) {
                               	if ($User eq $fields[1]) { # job author is change author
	        			`$p4 change -f -i < $Scratchfile`;
	        			`$p4 job -d $Job`;
                                        return 0;
				}
                        	last;
                        }
                }
                # job author is not change author - are they in the authorised group?
                my @augroup = `$p4 group -o $upgroup`;
                my $latch = 0;
                foreach (@augroup) {
                	if ($latch) {
                        	if ($_ eq $User) { # job author is in updates group
	        			`$p4 change -f -i < $Scratchfile`;
        				`$p4 job -d $Job`;
                                        return 0;
                                }
			}
			else {
                        	if ($_ eq "Users:") {
                                	$latch = 1;
                                }
                        }
                }

	}
       	return -1; # change has been rejected for some reason.
}

main {
	 while (1) {
		# Get a complete list of Addendum jobs
		my @jobslist = `$p4 jobs -e Type=Addendum`;

		# Go through this list
		chomp (@jobslist);
		foreach (@jobslist) {
			my @fields = split(/ /);            # get jobname
			my @job = `$p4 job -o $fields[0]`;  # get job description
        		process_job (@job);
		}
                sleep 10;
	}
}