package XmlPrinter;

sub new {
    my ($this, $handle) = @_; 
    my $class = ref($this) || $this;
    binmode $handle, ':encoding(utf8)';
    #print $handle '<?xml version="1.0" encoding="UTF-8"?>'."\n";
    my $self = {fh => $handle, indent => '', disablecnt => 0};
    return bless $self, $class;
}

sub disableOut {
    my ($self) = @_;
    $self->{disablecnt} = $self->{disablecnt} + 1;
}

sub enableOut {
    my ($self) = @_;
    $self->{disablecnt} = $self->{disablecnt} - 1;
}

sub escape {
    my ($chars) = @_;
    $chars =~ s/&/&amp;/g;
    $chars =~ s/>/&gt;/g;
    $chars =~ s/</&lt;/g;
    return $chars;
}

sub begin {
    my ($self, $name, $data, @attributes) = @_;
    if ($self->{disablecnt} == 0) {
        my $fh = $self->{fh};
        if (not @attributes) {
            print $fh $self->{indent}."<$name>\n";
        } else {
            die "$name: Not a HASH reference" unless ref $data eq 'HASH';
            print $fh $self->{indent}."<$name";
            for my $attr (@attributes) {
                my $val = $data->{$attr};
                print $fh " $attr=\"$val\"" if defined $val;
            }
            print $fh ">\n";
        }
    }
    $self->{indent} .= '  ';
}

sub end {
    my ($self, $name) = @_;
    chop $self->{indent};
    chop $self->{indent};
    if ($self->{disablecnt} == 0) {
        my $fh = $self->{fh};
        print $fh $self->{indent}."</$name>\n";
    }
}

sub property {
    my ($self, $prop, $val) = @_;
    if ($self->{disablecnt} == 0) {
        my $indent = $self->{indent};
        my $fh = $self->{fh};
        return unless defined $val;
        if (not ref $val) {
            print $fh "$indent<$prop>".escape($val)."</$prop>\n";
        } elsif (ref $val eq 'ARRAY') {
            print $fh "$indent<$prop>".escape($_)."</$prop>\n" for @$val;
        } else {
            die "$prop: Not an ARRAY reference";
        }
    }
}

sub properties {
    my ($self, $data, @props) = @_;
    if ($self->{disablecnt} == 0) {
        my $indent = $self->{indent};
        my $fh = $self->{fh};
        for my $prop (@props) {
            my $val = $data->{$prop};
            next unless defined $val;
            if (not ref $val) {
                print $fh "$indent<$prop>".escape($val)."</$prop>\n";
            } elsif (ref $val eq 'ARRAY') {
                print $fh "$indent<$prop>".escape($_)."</$prop>\n" for @$val;
            } else {
                die "$prop: Not an ARRAY reference";
            }
        }
    }
}



#### TEST ##### TEST ##### TEST ##### TEST ##### TEST ##### TEST ##### TEST ####

sub test {
    my $printer = XmlPrinter->new(*STDOUT);
    my $data = { xmlns => "blah/blah", date => "today" };
    $printer->header();
    $printer->begin("Persons", $data, qw( date ));
    $data = { id => "1", name => "James", nick => "Jimmy" };
    $printer->begin("Person", $data, "id");
    $printer->properties($data, qw( name nick ));
    $printer->end("Person");
    $printer->end("Persons");
    
} 

#test;

1;