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sub initialize {
    my $self = shift;
    $self->SUPER::initialize(@_);
    $self->_private;
    $self;
}

sub _private {
    my $self = shift;
    $self->{_MyParser} ||= {
        Text      => [],       # final text
        Indent    => 0,        # list indent levels counter
        ListType  => '-',      # character on every item
        searching => undef,    # what are we searching for? (title, author etc.)
        Title     => undef,    # page title
        Author    => undef,    # page author
    };
}

sub as_markdown {
    my ($parser, %args) = @_;
    my $data  = $parser->_private;
    my $lines = $data->{Text};
    my @header;
    if ($args{with_meta}) {
        @header = $parser->_build_markdown_head;
    }
    join("\n" x 2, @header, @{$lines});
}

sub _build_markdown_head {
    my $parser    = shift;
    my $data      = $parser->_private;
    my $paragraph = '';
    if (defined $data->{Title}) {
        $paragraph .= sprintf '[[meta title="%s"]]', $data->{Title};
    }
    if (defined $data->{Author}) {
        $paragraph .= "\n" . sprintf '[[meta author="%s"]]', $data->{Author};
    }
    return $paragraph;
}

sub _save {
    my ($parser, $text) = @_;
    my $data = $parser->_private;
    $text = $parser->_indent_text($text);
    push @{ $data->{Text} }, $text;
    return;
}

sub _indent_text {
    my ($parser, $text) = @_;
    my $data   = $parser->_private;
    my $level  = $data->{Indent};
    my $indent = undef;
    if ($level > 0) {
        $level--;
    }
    $indent = ' ' x ($level * 4);
    my @lines = map { $indent . $_; } split(/\n/, $text);
    return wantarray ? @lines : join("\n", @lines);
}

sub _clean_text {
    my $text    = $_[1];
    my @trimmed = grep { $_; } split(/\n/, $text);
    return wantarray ? @trimmed : join("\n", @trimmed);
}

sub command {
    my ($parser, $command, $paragraph, $line_num) = @_;
    my $data = $parser->_private;

    # cleaning the text
    $paragraph = $parser->_clean_text($paragraph);

    # is it a header ?
    if ($command =~ m{head(\d)}xms) {
        my $level = $1;

        $paragraph = $parser->interpolate($paragraph, $line_num);

        # the headers never are indented
        $parser->_save($parser->format_header($level, $paragraph));
        if ($level == 1) {
            if ($paragraph =~ m{NAME}xmsi) {
                $data->{searching} = 'title';
            } elsif ($paragraph =~ m{AUTHOR}xmsi) {
                $data->{searching} = 'author';
            } else {
                $data->{searching} = undef;
            }
        }
    }

    # opening a list ?
    elsif ($command =~ m{over}xms) {

        # update indent level
        $data->{Indent}++;

        # closing a list ?
    } elsif ($command =~ m{back}xms) {

        # decrement indent level
        $data->{Indent}--;
    } elsif ($command =~ m{item}xms) {
        $parser->_save(sprintf '%s %s',
            $data->{ListType}, $parser->interpolate($paragraph, $line_num));
    }

    # ignore other commands
    return;
}

sub verbatim {
    my ($parser, $paragraph) = @_;
    $parser->_save($paragraph);
}