package XML::Grammar::Screenplay::FromProto::Parser::QnD;
$XML::Grammar::Screenplay::FromProto::Parser::QnD::VERSION = '0.24.0';
use strict;
use warnings;

use Carp qw/ cluck /;
use MooX 'late';

extends('XML::Grammar::FictionBase::FromProto::Parser::XmlIterator');

use XML::Grammar::Fiction::Struct::Tag ();
use XML::Grammar::FictionBase::Event   ();

use List::Util      ();
use List::MoreUtils ();

has "_in_saying"          => ( isa => "Bool", is => "rw" );
has "_prev_line_is_empty" => ( isa => "Bool", is => "rw", default => 1 );
has '_is_start'           => ( isa => 'Bool', is => 'rw' );

before 'next_line_ref' => sub {
    my $self = shift;

    $self->_prev_line_is_empty(
        scalar( ${ $self->curr_line_ref() } =~ m{\A\s*\z} ) );

    return;
};

sub _debug
{
    my ( $self, $args ) = @_;

    if (1)
    {
        my $name = $args->{name};
        cluck "${name}[[["
            . join( ",", map { $_->name() } @{ $self->_tags_stack } ) . "; "
            . ${ $self->curr_line_ref } . "]]]";
    }

    return;
}

sub _top_is_para
{
    my $self = shift;

    return $self->_in_para() && ( $self->_top_is('p') );
}

sub _top_is_saying
{
    my $self = shift;

    return $self->_in_saying() && ( $self->_top_is('saying') );
}

sub _top_is
{
    my ( $self, $want_name ) = @_;

    my $_top_tag = $self->_top_tag;
    return ( $_top_tag and $_top_tag->name eq $want_name );
}

sub _top_is_desc
{
    my $self = shift;

    return $self->_top_is('desc');
}

around '_pop_tag' => sub {
    my ( $orig, $self ) = @_;

    my $open = $self->$orig();

    if ( $open->name() eq "saying" )
    {
        $self->_in_saying(0);
    }

    return $open;
};

sub _count_tags_in_stack
{
    my $self = shift;
    my $name = shift;

    my @tags = $self->_grep_tags_stack( sub { $_->name() eq $name; } );

    return scalar(@tags);
}

after '_push_tag' => sub {
    my $self = shift;

    # This is an assert - it must never happen.
    if ( $self->_count_tags_in_stack("p") >= 2 )
    {
        Carp::confess(qq{Two paragraphs in the tags stack.});
    }

    if ( $self->_count_tags_in_stack("para") >= 2 )
    {
        Carp::confess(qq{Two paragraphs in the tags stack.});
    }

    # This is an assert - it must never happen.
    if ( $self->_count_tags_in_stack("saying") >= 2 )
    {
        Carp::confess(qq{Two sayings in the tags stack at the same time.});
    }

    return;
};

sub _new_saying
{
    my $self     = shift;
    my $sayer    = shift;
    my $contents = shift;

    return $self->_new_node(
        {
            t         => "Saying",
            character => $sayer,
            children  => $self->_new_list($contents),
        }
    );
}

sub _get_desc_name
{
    my $self = shift;

    return ( $self->_in_para() ? "innerdesc" : "desc" );
}

sub _create_closing_desc_tag
{
    my $self = shift;

    return XML::Grammar::Fiction::Struct::Tag->new(
        name => $self->_get_desc_name(),
        line => $self->line_num(),
    );
}

sub _detect_closing_desc_tag
{
    my $self = shift;

    return ( ${ $self->curr_line_ref() } =~ m{\G\]}cg );
}

around '_parse_closing_tag' => sub {
    my ( $orig, $self ) = @_;

    return $self->_detect_closing_desc_tag
        ? $self->_create_closing_desc_tag
        : $self->$orig();
};

sub _detect_open_desc_tag
{
    my $self = shift;

    return ( ${ $self->curr_line_ref } =~ m{\G\[}cg );
}

sub _create_open_desc_tag
{
    my ($self) = @_;

    my $not_inline = 0;
    if ( $self->_is_start && $self->_prev_line_is_empty() )
    {
        $self->_close_top_tags();
        $not_inline = 1;
    }

    return XML::Grammar::Fiction::Struct::Tag->new(
        name  => $not_inline ? "desc" : $self->_get_desc_name(),
        line  => $self->line_num(),
        attrs => [],
    );
}

sub _set_is_start
{
    my $self = shift;

    $self->_is_start( $self->at_line_start );

    return;
}

around '_parse_opening_tag' => sub {
    my ( $orig, $self ) = @_;

    $self->_set_is_start;

    return $self->_detect_open_desc_tag
        ? $self->_create_open_desc_tag
        : $self->$orig();
};

sub _parse_speech_unit
{
    my $self = shift;

    if ( ${ $self->curr_line_ref() } !~ /\G([^:\n]+): /cgms )
    {
        Carp::confess( "Cannot match addressing at line " . $self->line_num() );
    }

    my $sayer = $1;

    if ( $sayer =~ m{[\[\]]} )
    {
        Carp::confess(
            "Tried to put an inner-desc inside an addressing at line "
                . $self->line_num() );
    }

    # All pluses
    if ( $sayer =~ m{\A\++\z} )
    {
        return { elem => $self->_new_para( [] ), para_end => 0 };
    }
    else
    {
        return {
            elem     => $self->_new_saying( $sayer, [] ),
            sayer    => $sayer,
            para_end => 0
        };
    }
}

sub _non_tag_text_unit_consume_regex
{
    return qr{(?:[\<\[\]]|^\n?$)}ms;
}

sub _is_there_a_speech_unit
{
    my $self = shift;

    my $l = $self->curr_line_ref();

    return (   $self->at_line_start()
            && ( !$self->_top_is_desc() )
            && ( $$l =~ m{\A[^\[][^:]*:} ) );
}

around '_parse_non_tag_text_unit' => sub {
    my ( $orig, $self ) = @_;

    return (
          $self->_is_there_a_speech_unit()
        ? $self->_parse_speech_unit()
        : $self->$orig()
    );
};

sub _look_for_tag_opener
{
    my $self = shift;

    my $l = $self->curr_line_ref();

    if ( $$l =~ m{\G([<\[\]])} )
    {
        return $1;
    }
    else
    {
        return;
    }
}

sub _is_closing_tag
{
    my $self      = shift;
    my $tag_start = shift;

    return ( ${ $self->curr_line_ref() } =~ m{\G(</|\])} );
}

sub _generate_non_tag_text_event
{
    my $self   = shift;
    my $status = $self->_parse_non_tag_text_unit();

    if ( !defined($status) )
    {
        return;
    }

    my $elem        = $status->{'elem'};
    my $is_para_end = $status->{'para_end'};
    my $is_saying =
        $elem->isa("XML::Grammar::Fiction::FromProto::Node::Saying");
    my $is_para =
        $elem->isa("XML::Grammar::Fiction::FromProto::Node::Paragraph");

    my $in_para              = $self->_in_para();
    my $was_already_enqueued = 0;

    if ( ( $is_saying || $is_para ) && $in_para )
    {
        $self->_enqueue_event(
            XML::Grammar::FictionBase::Event->new(
                { type => "close", tag => "para" }
            )
        );
        $in_para = 0;
    }

    if ( $is_saying && $self->_in_saying() )
    {
        $self->_enqueue_event(
            XML::Grammar::FictionBase::Event->new(
                { type => "close", tag => "saying" }
            )
        );
    }

    if ($is_saying)
    {
        $self->_enqueue_event(
            XML::Grammar::FictionBase::Event->new(
                { type => "open", tag => "saying", tag_elem => $elem, },
            ),
        );
        $was_already_enqueued = 1;

        $self->_enqueue_event(
            XML::Grammar::FictionBase::Event->new(
                { type => "open", tag => "para" }
            )
        );
        $in_para = 1;
    }
    elsif ( $is_para && !$in_para )
    {
        $self->_enqueue_event(
            XML::Grammar::FictionBase::Event->new(
                { type => "open", tag => "para" }
            ),
        );
        $in_para = 1;
    }

    if ( $elem->isa("XML::Grammar::Fiction::FromProto::Node::Text")
        && !$was_already_enqueued )
    {
        if ( !$in_para )
        {
            $self->_enqueue_event(
                XML::Grammar::FictionBase::Event->new(
                    { type => "open", tag => "para" },
                )
            );
            $in_para = 1;
        }
        $self->_enqueue_event(
            XML::Grammar::FictionBase::Event->new(
                { type => "elem", elem => $elem, }
            )
        );
        $was_already_enqueued = 1;
    }

    return;
}

sub _handle_close_saying
{
    my $self = shift;
    my $open = $self->_pop_tag();

    # This is an assert.
    if ( $open->name() ne "saying" )
    {
        Carp::confess(qq{Not a saying tag.});
    }

    my $new_elem = $self->_new_saying(
        (
            List::Util::first { $_->{key} eq "character" }
            @{ $open->attrs() }
        )->{value},
        $open->detach_children(),
    );

    $self->_add_to_top_tag($new_elem);

    return;
}

sub _assert_top_is_para
{
    my ( $self, $open ) = @_;

    if ( $open->name() ne "p" )
    {
        Carp::confess(qq{Not a para tag.});
    }

    return;
}
{
    my $ALLOWED_PARA_PARENTS = +{ 'desc' => 1, 'saying' => 1, };

    sub _process_closed_para
    {
        my ( $self, $open ) = @_;

        my $children = $open->detach_children();

        # Filter away empty paragraphs.
        if ( defined($children) && @$children )
        {
            my $para = $self->_new_para($children);
            my $name = $self->_top_tag->name;

            if (
                not exists

                $ALLOWED_PARA_PARENTS->{$name}
                )
            {
                Carp::confess(
qq#Unanchored paragraph not inside a saying or a description at line @{[$open->line()]}#
                );
            }
            $self->_add_to_top_tag($para);
        }

        return;
    }
}

sub _close_para
{
    my $self = shift;

    my $open = $self->_pop_tag();

    $self->_assert_top_is_para($open);

    $self->_process_closed_para($open);

    $self->_in_para(0);

    return;
}

sub _create_start_para
{
    my $self = shift;

    return XML::Grammar::Fiction::Struct::Tag::Para->new(
        name          => "p",
        is_standalone => 0,
        line          => $self->line_num(),
        attrs         => [],
        children      => [],
    );
}

sub _start_para
{
    my $self = shift;
    $self->_push_tag( $self->_create_start_para() );

    $self->_in_para(1);

    return;
}

sub _close_top_tags
{
    my $self = shift;

    if ( $self->_top_is_para() )
    {
        $self->_close_para();
    }

    if ( $self->_top_is_saying() )
    {
        $self->_handle_close_saying();
    }

    return;
}

sub _handle_close_para
{
    my ( $self, $event ) = @_;

    return $self->_close_para();
}

sub _handle_open_para
{
    my ( $self, $event ) = @_;

    return $self->_start_para();
}

sub _create_open_saying_tag
{
    my $self  = shift;
    my $event = shift;

    return XML::Grammar::Fiction::Struct::Tag->new(
        {
            name          => "saying",
            is_standalone => 0,

            # TODO : propagate the correct line_num
            # from the called-to layers.
            line  => $self->line_num(),
            attrs => [
                { key => "character", value => $event->tag_elem->character() }
            ],
            children => [],
        }
    );
}

sub _handle_open_saying
{
    my ( $self, $event ) = @_;

    $self->_push_tag( $self->_create_open_saying_tag($event) );

    $self->_in_saying(1);

    return;
}

sub _handle_saying_event
{
    my ( $self, $event ) = @_;

    return $event->is_open()
        ? $self->_handle_open_saying($event)
        : $self->_handle_close_saying();
}

sub _list_valid_tag_events
{
    return [qw(para saying)];
}

before '_handle_open_tag' => sub {
    my $self = shift;

    if ( $self->_top_is_desc )
    {
        if ( !$self->_in_para() )
        {
            $self->_start_para();
        }
    }

    return;
};

before '_handle_close_tag' => sub {
    my $self = shift;

    $self->_close_top_tags();
};

sub _look_ahead_for_tag
{
    my $self = shift;

    my $l = $self->curr_line_copy();

    my $is_tag_cond = ( $$l =~ m{\G([<\[\]])} );

    my $is_close = $is_tag_cond && ( $$l =~ m{\G(?:</|\])} );

    return ( $is_tag_cond, $is_close );
}

sub _main_loop_iter_on_empty_line
{
    my $self = shift;

    if ( $self->_top_is_para() )
    {
        $self->_close_para();
    }

    $self->next_line_ref();

    return;
}

sub _main_loop_iter_on_whitepsace
{
    my $self = shift;

    $self->_add_to_top_tag( $self->_new_text( [" "] ) );

    $self->next_line_ref();

    return;
}

sub _main_loop_iter_body_prelude
{
    my $self = shift;

    my $l = $self->curr_line_ref();

    return (
          ( $$l eq "\n" )             ? $self->_main_loop_iter_on_empty_line
        : ( $$l =~ m{\G[ \t]+\n?\z} ) ? $self->_main_loop_iter_on_whitepsace
        :                               1
    );
}


1;

__END__

=pod

=encoding UTF-8

=head1 NAME

XML::Grammar::Screenplay::FromProto::Parser::QnD - Quick and Dirty parser
for the Screenplay-XML proto-text.

B<For internal use only>.

=head1 VERSION

version 0.24.0

=head1 METHODS

=head2 $self->process_text($string)

Processes the text and returns the parse tree.

=head2 $self->meta()

Leftover from Moo.

=head2 $self->next_line_ref

Leftover from Moo.

=for :stopwords cpan testmatrix url bugtracker rt cpants kwalitee diff irc mailto metadata placeholders metacpan

=head1 SUPPORT

=head2 Websites

The following websites have more information about this module, and may be of help to you. As always,
in addition to those websites please use your favorite search engine to discover more resources.

=over 4

=item *

MetaCPAN

A modern, open-source CPAN search engine, useful to view POD in HTML format.

L<https://metacpan.org/release/XML-Grammar-Fiction>

=item *

RT: CPAN's Bug Tracker

The RT ( Request Tracker ) website is the default bug/issue tracking system for CPAN.

L<https://rt.cpan.org/Public/Dist/Display.html?Name=XML-Grammar-Fiction>

=item *

CPANTS

The CPANTS is a website that analyzes the Kwalitee ( code metrics ) of a distribution.

L<http://cpants.cpanauthors.org/dist/XML-Grammar-Fiction>

=item *

CPAN Testers

The CPAN Testers is a network of smoke testers who run automated tests on uploaded CPAN distributions.

L<http://www.cpantesters.org/distro/X/XML-Grammar-Fiction>

=item *

CPAN Testers Matrix

The CPAN Testers Matrix is a website that provides a visual overview of the test results for a distribution on various Perls/platforms.

L<http://matrix.cpantesters.org/?dist=XML-Grammar-Fiction>

=item *

CPAN Testers Dependencies

The CPAN Testers Dependencies is a website that shows a chart of the test results of all dependencies for a distribution.

L<http://deps.cpantesters.org/?module=XML::Grammar::Fiction>

=back

=head2 Bugs / Feature Requests

Please report any bugs or feature requests by email to C<bug-xml-grammar-fiction at rt.cpan.org>, or through
the web interface at L<https://rt.cpan.org/Public/Bug/Report.html?Queue=XML-Grammar-Fiction>. You will be automatically notified of any
progress on the request by the system.

=head2 Source Code

The code is open to the world, and available for you to hack on. Please feel free to browse it and play
with it, or whatever. If you want to contribute patches, please send me a diff or prod me to pull
from your repository :)

L<https://github.com/shlomif/fiction-xml>

  git clone git://github.com/shlomif/fiction-xml.git

=head1 AUTHOR

Shlomi Fish <shlomif@cpan.org>

=head1 BUGS

Please report any bugs or feature requests on the bugtracker website
L<https://github.com/shlomif/fiction-xml/issues>

When submitting a bug or request, please include a test-file or a
patch to an existing test-file that illustrates the bug or desired
feature.

=head1 COPYRIGHT AND LICENSE

This software is Copyright (c) 2007 by Shlomi Fish.

This is free software, licensed under:

  The MIT (X11) License

=cut
