#!/usr/bin/perl

use strict;

open(GEOJSON, ">feature-filter/in.json");
open(FILTER, ">feature-filter/filter");

sub calchash {
	my $h = 0;
	my $s = $_[0];
	while ($s =~ s/^(.)//) {
		$h = ($h * 37 + ord($1)) & ((1 << 32) - 1);
	}
	return $h;
}

my $filter = "";
my $hash = 0;

print FILTER "{\n";
my $first = 1;

open(IN, "../../mapbox-gl-js/test/unit/style-spec/feature_filter.test.js");
while (<IN>) {
	if (/const f[0-9]* = filter\((.*)\);/) {
		$filter = $1;
		$filter =~ s/'/"/g;
		$hash = "layer" . calchash($filter);

		unless ($filter =~ /apply/) {
			if ($first) {
				$first = 0;
			} else {
				print FILTER ",\n";
			}

			print FILTER "\"$hash\": $filter,\n";
			print FILTER "\"not$hash\": [ \"none\", $filter ]\n";
		}
	}

	if (/t.equal\(f[0-9]*\({(.*)}\), ([a-z]+)\);/) {
		unless ($filter =~ /apply/) {
			my $prop = $1;
			my $matched = $2;

			if ($prop =~ /properties/) {
				next if $prop =~ /undefined/;

				$prop =~ s/properties/"properties"/g;
				$prop =~ s/foo/"foo"/g;
				$prop =~ s/id/"id"/g;
				$prop =~ s/undefined/null/g;
				$prop =~ s/'/"/g;

				my $qprop = "$prop, $filter";
				$qprop =~ s/"/\\"/g;

				if ($matched eq "true") {
					$prop =~ s/}/, \"rule\": \"$qprop\"}/;
					$prop =~ s/^"properties": {,/"properties": {/;

					print GEOJSON "{ \"type\": \"Feature\", \"tippecanoe\": { \"layer\": \"$hash\" }, $prop, \"geometry\": { \"type\": \"Point\", \"coordinates\": [ 0, 0 ] } }\n";
					print GEOJSON "{ \"type\": \"Feature\", \"tippecanoe\": { \"layer\": \"not$hash\" }, $prop, \"geometry\": { \"type\": \"Point\", \"coordinates\": [ -100, 0 ] } }\n";
				} else {
					$prop =~ s/}/, \"rule\": \"not $qprop\"}/;
					$prop =~ s/^"properties": {,/"properties": {/;

					print GEOJSON "{ \"type\": \"Feature\", \"tippecanoe\": { \"layer\": \"not$hash\" }, $prop, \"geometry\": { \"type\": \"Point\", \"coordinates\": [ 0, 0 ] } }\n";
					print GEOJSON "{ \"type\": \"Feature\", \"tippecanoe\": { \"layer\": \"$hash\" }, $prop, \"geometry\": { \"type\": \"Point\", \"coordinates\": [ -100, 0 ] } }\n";
				}
			}
		}
	}
}

print FILTER "}\n";