#!/usr/bin/perl

use warnings;
use strict;

use CGI qw/:standard/;
use CGI::Carp qw/fatalsToBrowser/;
use File::Slurp;
use YAML;
use Data::Page;
use Data::Dump qw/dump/;
use SWISH::API;
use JSON;
use Text::Unaccent::PurePerl qw/unac_string/;
use HTML::FillInForm::Lite;
use Encode;

my $range_around = 5;
my @entries_per_page = ( 30, 50, 100, 500 );
my $debug = param('debug');

print header(
	-charset => 'utf-8',
);

sub dump_yaml {
	my $name = shift;
	print qq|<div class=dump><tt>$name</tt><pre>|, YAML::Dump( @_ ), qq|</pre></div>| if $debug;
}

sub show_pager {
	my ($pager) = @_;

	my @show_pages;
	my $after_current = 0;

	if ( $pager->current_page <= $range_around + 2 ) {
		@show_pages = ( $pager->first_page .. $pager->current_page );
		$after_current = $range_around - $pager->current_page;
	} else {
		@show_pages = ( $pager->first_page, '', $pager->current_page - $range_around .. $pager->current_page );
	}

	if ( $pager->current_page + $after_current + $range_around + 1 >= $pager->last_page ) {
		push @show_pages, ( $pager->current_page + 1 .. $pager->last_page );
	} else {
		push @show_pages, ( $pager->current_page + 1 .. $pager->current_page + $after_current + $range_around, '', $pager->last_page );
	}

#	dump_yaml( 'show_pages', \@show_pages );

	return '' unless $#show_pages;

	my ( $prev, $next ) = ( '&lt;&lt;', '&gt;&gt;' );

	sub li_a_href {
		my ( $page, $label, $attr ) = @_;
		param( 'current_page', $page );
		my $url = self_url( -query => 1 );
		$attr ||= '';
		$label ||= $page;
		qq|<li$attr><a href="$url" title="$page">$label</a></li>|;
	}

	return
		  $pager->previous_page ? li_a_href( $pager->previous_page, $prev ) : qq|<li class=skip>$prev</li>|
		, ( map {
			if ( $_ eq $pager->current_page ) {
				qq|<li class=current_page>$_</li>|;
			} elsif ( $_ eq '' ) {
				qq|<li class=skip>...</li>|;
			} else {
				li_a_href( $_ );
			}
		} @show_pages )
		, $pager->next_page ? li_a_href( $pager->next_page, $next ) : qq|<li class=skip>$next</li>|
		;
		
}

my $path = $ENV{PATH_INFO} || 'ecas';
$path =~ s{^/+}{};
$path =~ s{/+$}{};
my $dir = $0;
$dir =~ s{/[^/]+.cgi}{};

dump_yaml( 'dir', $dir );

my $config = YAML::LoadFile( "$dir/$path/config.yml" );

my $database = (keys %{ $config->{databases} })[0];
die "$database not in $path" unless $path =~ m{\Q$database\E};

my $html_markup = "$dir/$path/html.pm";
my $html_markup_skip;
if ( -e $html_markup ) {
	require $html_markup;
	$html_markup = $database . '::html';
} else {
	undef $html_markup;
}

my $stats;
{
	my $path = "$dir/../var/swish/$database.yaml";
	$stats = YAML::LoadFile( $path );
	dump_yaml( "stats $path", $stats );
}

my $db = $config->{databases}->{$database};

sub read_config_txt {
	my ( $file ) = @_;
	my $input;
	my $path ="$dir/$path/$path-$file.txt";
	if ( ! -e $path ) {
		warn "missing $path";
		return;
	}
	foreach ( split(/[\n\r]+/, read_file( $path ) ) ) {
		my ( $val,$label ) = split(/\s*\t\s*/,$_,2);
		push @{ $input->{ '-values' } }, $val;
				$input->{ '-labels' }->{$val} = $label;
	}
	return $input;
}

my $attr_labels    = read_config_txt 'labels';
my $attr_operators = read_config_txt 'operators';

my @attr = @{ $attr_labels->{'-values'} } if $attr_labels;
@attr = keys %{ $stats->{attr} } unless @attr;


warn dump( $attr_labels, $attr_operators );

my $only_input;
my $inputs_available = 0;

foreach ( @{ $db->{input} } ) {
	my $input = $_->{name} || die "no name in ",dump( $_ );
	next unless defined $stats->{input}->{$input}; # skip inputs without data
	if ( ! $only_input->{'-labels'}->{$input} ) {
		push @{ $only_input->{'-values'} }, $input;
		        $only_input->{'-labels'}->{$input} = $_->{description} || $input;
		$inputs_available++;
	}
}

warn "## only_input = ", dump( $only_input );

my @style = ( '../../style.css' );
push @style, "../../$path/$path.css" if -e "$dir/$path/$path.css";
dump_yaml( 'style', \@style );

sub search_form {

	my $form_html = "$dir/$path/$path-search.html";
	if ( -e $form_html ) {
		my $html = read_file( $form_html );
		my $q = CGI->new();
		my $h = HTML::FillInForm::Lite->new();
		return $h->fill(\$html, $q);
	}

	qq|<a name="form"></a>|,
	start_form( -action => self_url( query => 0 ) ),
		checkbox_group(
			-name => 'attr',
			%$attr_labels,
#			-linebreak => 0,
		),
		textfield( -name => 'search' ),
		$attr_operators ? popup_menu( -name => 'attr_operator', %$attr_operators ) : '',
		submit( -value => 'Search' ),
#		hidden( -name => 'entries_per_page', -default => $entries_per_page ),
		popup_menu( -name => 'entries_per_page', -values => [ @entries_per_page ], -title => 'entries per page' ),
		# we need current_page fixed at 1 so that every submit through form will reset it
		qq|<input type=hidden name=current_page value=1 >|,
		checkbox( -name => 'debug', -default => 0 ), # FIXME hidden?
		qq|<div id=inputs>|,
		$inputs_available > 1 ?
		h2( 'Select input' ) .
		checkbox_group(
			-name => 'only_input',
			%$only_input,
			-linebreak=> 'true',
		) : '',
		qq|</div>|,
		end_form,
	;
}


print
	start_html(
		-title => $db->{name},
		-style => [ @style ],
	),
	h1( $db->{name} ),
	qq|<div id=description>|, $db->{description}, qq|</div>|,
;

if ( my $search = param('search') ) {

	$search = unac_string( Encode::decode('utf-8',$search) );

	print qq|
		<a href="#form" class="skip" title="skip to search form">#</a>
		<div id="results">
	|;

	my $swish = SWISH::API->new( "$dir/../var/swish/$database" );
	$swish->abort_last_error if $swish->Error;

	my @search = (); 
	my @attrs = param('attr');
	my $op = param('attr_operator');

	if ( $search =~ m{(=|"|\bAND\b|\bOR\b)} ) {
		push @search, $search;
	} elsif ( @attrs ) {

		$op ||= 'Q*';
		my @or;
		foreach my $attr ( @attrs ) {
			my $v = $search;
			$v =~ s/^\s+//;
			warn "-- v: $v\n";
			sub rewrite {
				my ( $attr, $whitespace, $v ) = @_;
				warn "## filter $op $whitespace $v\n";
				my $template = $op;
				   $template =~ s{Q}{$v};
				$whitespace = " AND " if $whitespace;

				# don't return -* &* and other non-word characters
				return '' if $template =~ m/^\W\*$/ || $template =~ m/\band\b/i;

				return
					$whitespace .
					$attr . '="' . $template . '"';
					;
			};
			if ( $op =~ m{\s} ) {
				my $template = $op;
				   $template =~ s{Q}{$v};
				$v = $attr . '="' . $template . '"';
			} else {
				$v =~ s{(\s*)(\S+)}{rewrite($attr,$1,$2)}ge;
			}

			push @or, $v;
		
		}
		push @search, '(' . join(') OR (', @or) . ')';

	} else {
		push @search, "all=\"$search\"";
	}

	my $q = '(' . join(') AND (', @search) . ')';

	my @only_input = param('only_input');
	$q .= ' AND ((' . join(') OR (', map { "input=\"$_\"" } @only_input) . '))' if @only_input;

	warn "# query: $q\n";
	my $search_obj = $swish->new_search_object;
	if ( my $sort = param('sort') ) {
		$search_obj->set_sort( $sort );
	}
	my $swish_results = $search_obj->execute( $q );

	dump_yaml( 'swish_results', $swish_results );

	my $pager = Data::Page->new;
	$pager->$_( param($_) ) foreach ( qw/entries_per_page current_page/ );
	$pager->total_entries( $swish_results->hits );

	dump_yaml( 'pager', $pager );

	$swish_results->seek_result( $pager->first - 1 );

	if ( ! $pager->total_entries ) {
		my $no_results = 'No results for search <b>%s</b>';
		$no_results = $swish->error_string . '<br><b>%s</b>' if $swish->error;
		printf qq|<div class="error">$no_results</div>\n\n|, $q;
	} else {

		my $results = "<b>%d</b> results for search <b>%s</b> showing results %d - %d";
		printf qq|<div class="message">$results</div>\n\n|, $pager->total_entries, $q, $pager->first, $pager->last;

		my $pager_html = join("\n", show_pager( $pager ));

		print qq|<ul class="pager">$pager_html</ul>\n\n| if $pager_html;

		my $nr = $pager->first;
		print qq|<ol start=$nr>\n|;

		my $limit = $pager->entries_on_this_page;

		my $nr = 1;

		while ( my $result = $swish_results->next_result ) {

			my $data = $result->property('data');
			dump_yaml( 'data', $data );
			# FIXME if we produce valid json we shouldn't need eval here!
			eval { $data = from_json( $data, {utf8 => 1} ); };
			if ( $@ ) {
				warn "ERROR: $@ from ",dump( $data );
				next;
			}

			my $li_class = '';
			$li_class = qq| class="z"| if $nr % 2 == 0;
			print qq|<li$li_class>|;
			foreach my $attr ( @attr ) {
				next unless defined $data->{$attr};
				my $v = $data->{$attr};
				if ( $html_markup && ! $html_markup_skip->{$attr} ) {
					eval "\$v = $html_markup->$attr( \$v, \$data );";
					if ( $@ ) {
						warn "disable html markup for $attr: $@";
						$html_markup_skip->{$attr} = $@;
					}
				} else {
					$v =~ s{(http://\S+)}{<a href="$1">$1</a>};
				}
				my $label = $attr_labels->{'-labels'}->{$attr} || $attr;
				print qq|<div><label>$label</label><span class=$attr>$v</span></div>\n|;
			}
			print qq|</li>\n|;

			last if $nr++ == $pager->last;
		}
		print qq|</ol>\n\n|;

		print qq|<ul class="pager bottom">$pager_html</ul>\n\n| if $pager_html;
	}
	print qq|</div>|;

	dump_yaml( 'pager', $pager );

}

print search_form;

dump_yaml( "config databases $database", $db );
dump_yaml( 'html_markup_skip', $html_markup_skip );

print	end_html;