package DXLog;
-use FileHandle;
+require Exporter;
+@ISA = qw(Exporter);
+@EXPORT = qw(Log Logclose);
+
+use IO::File;
use DXVars;
-use DXDebug;
use DXUtil;
use Julian;
+
use Carp;
use strict;
+use vars qw($log);
+
+$log = new('log', 'dat', 'm');
+
+# create a log object that contains all the useful info needed
+# prefix is the main directory off of the data directory
+# sort is 'm' for monthly, 'd' for daily
+sub new
+{
+ my ($prefix, $suffix, $sort) = @_;
+ my $ref = {};
+ $ref->{prefix} = "$main::data/$prefix";
+ $ref->{suffix} = $suffix if $suffix;
+ $ref->{sort} = $sort;
+
+ # make sure the directory exists
+ mkdir($ref->{prefix}, 0777) unless -e $ref->{prefix};
+ return bless $ref;
+}
+
+sub _genfn
+{
+ my ($self, $jdate) = @_;
+ my $year = $jdate->year;
+ my $thing = $jdate->thing;
+
+ my $fn = sprintf "$self->{prefix}/$year/%02d", $thing if $jdate->isa('Julian::Month');
+ $fn = sprintf "$self->{prefix}/$year/%03d", $thing if $jdate->isa('Julian::Day');
+ $fn .= ".$self->{suffix}" if $self->{suffix};
+ return $fn;
+}
+
+# open the appropriate data file
+sub open
+{
+ my ($self, $jdate, $mode) = @_;
+
+ # if we are writing, check that the directory exists
+ if (defined $mode) {
+ my $year = $jdate->year;
+ my $dir = "$self->{prefix}/$year";
+ mkdir($dir, 0777) if ! -e $dir;
+ }
+
+ $self->{fn} = $self->_genfn($jdate);
+
+ $mode = 'r' if !$mode;
+ $self->{mode} = $mode;
+
+ my $fh = new IO::File $self->{fn}, $mode, 0666;
+ return undef if !$fh;
+ $fh->autoflush(1) if $mode ne 'r'; # make it autoflushing if writable
+ $self->{fh} = $fh;
+
+ $self->{jdate} = $jdate;
+
+# DXDebug::dbg("opening $self->{fn}\n") if isdbg("dxlog");
+
+ return $self->{fh};
+}
+
+sub delete($$)
+{
+ my ($self, $jdate) = @_;
+ my $fn = $self->_genfn($jdate);
+ unlink $fn;
+}
+
+sub mtime($$)
+{
+ my ($self, $jdate) = @_;
+
+ my $fn = $self->_genfn($jdate);
+ return (stat $fn)[9];
+}
+
+# open the previous log file in sequence
+sub openprev($$)
+{
+ my $self = shift;
+ my $jdate = $self->{jdate}->sub(1);
+ return $self->open($jdate, @_);
+}
+
+# open the next log file in sequence
+sub opennext($$)
+{
+ my $self = shift;
+ my $jdate = $self->{jdate}->add(1);
+ return $self->open($jdate, @_);
+}
+
+# convert a date into the correct format from a unix date depending on its sort
+sub unixtoj($$)
+{
+ my $self = shift;
+
+ if ($self->{'sort'} eq 'm') {
+ return Julian::Month->new(shift);
+ } elsif ($self->{'sort'} eq 'd') {
+ return Julian::Day->new(shift);
+ }
+ confess "shouldn't get here";
+}
+
+# write (actually append) to a file, opening new files as required
+sub write($$$)
+{
+ my ($self, $jdate, $line) = @_;
+ if (!$self->{fh} ||
+ $self->{mode} ne ">>" ||
+ $jdate->year != $self->{jdate}->year ||
+ $jdate->thing != $self->{jdate}->year) {
+ $self->open($jdate, ">>") or confess "can't open $self->{fn} $!";
+ }
+
+ return $self->{fh}->print("$line\n");
+}
+
+# write (actually append) using the current date to a file, opening new files as required
+sub writenow($$)
+{
+ my ($self, $line) = @_;
+ my $t = time;
+ my $date = $self->unixtoj($t);
+ return $self->write($date, $line);
+}
+
+# write (actually append) using a unix time to a file, opening new files as required
+sub writeunix($$$)
+{
+ my ($self, $t, $line) = @_;
+ my $date = $self->unixtoj($t);
+ return $self->write($date, $line);
+}
+
+# close the log file handle
+sub close
+{
+ my $self = shift;
+ undef $self->{fh}; # close the filehandle
+ delete $self->{fh};
+}
+
+sub DESTROY
+{
+ my $self = shift;
+ undef $self->{fh}; # close the filehandle
+ delete $self->{fh} if $self->{fh};
+}
+
+# log something in the system log
+# this routine is exported to any module that declares DXLog
+# it takes all its args and joins them together with the unixtime writes them out as one line
+# The user is responsible for making sense of this!
+sub Log
+{
+ my $t = time;
+ $log->writeunix($t, join('^', $t, @_) );
+}
+
+sub Logclose
+{
+ $log->close();
+}
+1;