/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2025 Artem Pavlenko
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *****************************************************************************/

#ifndef MAPNIK_JSON_FEATURE_GRAMMAR_X3_DEF_HPP
#define MAPNIK_JSON_FEATURE_GRAMMAR_X3_DEF_HPP

#include <mapnik/json/json_grammar_config.hpp>
#include <mapnik/json/feature_grammar_x3.hpp>
#include <mapnik/json/generic_json_grammar_x3.hpp>
#include <mapnik/json/unicode_string_grammar_x3.hpp>
#include <mapnik/json/positions_grammar_x3.hpp>
#include <mapnik/json/positions_x3.hpp>

#include <mapnik/json/create_geometry.hpp>
#include <mapnik/util/conversions.hpp>
#include <mapnik/value.hpp>
#include <mapnik/geometry/geometry_types.hpp>

namespace mapnik {
namespace json {

struct stringifier
{
    std::string operator()(std::string const& val) const { return "\"" + val + "\""; }

    std::string operator()(value_null) const { return "null"; }

    std::string operator()(value_bool val) const { return val ? "true" : "false"; }

    std::string operator()(value_integer val) const
    {
        std::string str;
        util::to_string(str, val);
        return str;
    }

    std::string operator()(value_double val) const
    {
        std::string str;
        util::to_string(str, val);
        return str;
    }

    std::string operator()(std::vector<mapnik::json::json_value> const& array) const
    {
        std::string str = "[";
        bool first = true;
        for (auto const& val : array)
        {
            if (first)
                first = false;
            else
                str += ",";
            str += mapnik::util::apply_visitor(*this, val);
        }
        str += "]";
        return str;
    }

    std::string operator()(std::vector<std::pair<std::string, mapnik::json::json_value>> const& object) const
    {
        std::string str = "{";
        bool first = true;
        for (auto const& kv : object)
        {
            if (first)
                first = false;
            else
                str += ",";
            str += "\"" + kv.first + "\"";
            str += ":";
            str += mapnik::util::apply_visitor(*this, kv.second);
        }
        str += "}";
        return str;
    }
};

struct attribute_value_visitor
{
  public:
    attribute_value_visitor(mapnik::transcoder const& tr)
        : tr_(tr)
    {}

    mapnik::value operator()(std::string const& val) const { return mapnik::value(tr_.transcode(val.c_str())); }

    mapnik::value operator()(std::vector<mapnik::json::json_value> const& array) const
    {
        std::string str = stringifier()(array);
        return mapnik::value(tr_.transcode(str.c_str()));
    }

    mapnik::value operator()(std::vector<std::pair<std::string, mapnik::json::json_value>> const& object) const
    {
        std::string str = stringifier()(object);
        return mapnik::value(tr_.transcode(str.c_str()));
    }

    template<typename T>
    mapnik::value operator()(T const& val) const
    {
        return mapnik::value(val);
    }

    mapnik::transcoder const& tr_;
};

namespace grammar {

namespace x3 = boost::spirit::x3;
using x3::char_;
using x3::lit;
using x3::omit;

namespace {
// import unicode string rule
auto const& geojson_string = unicode_string;
// import positions rule
auto const& positions_rule = positions;
} // namespace

// geometry types symbols
struct geometry_type_ : x3::symbols<mapnik::geometry::geometry_types>
{
    geometry_type_()
    {
        add                                                                                //
          ("\"Point\"", mapnik::geometry::geometry_types::Point)                           //
          ("\"LineString\"", mapnik::geometry::geometry_types::LineString)                 //
          ("\"Polygon\"", mapnik::geometry::geometry_types::Polygon)                       //
          ("\"MultiPoint\"", mapnik::geometry::geometry_types::MultiPoint)                 //
          ("\"MultiLineString\"", mapnik::geometry::geometry_types::MultiLineString)       //
          ("\"MultiPolygon\"", mapnik::geometry::geometry_types::MultiPolygon)             //
          ("\"GeometryCollection\"", mapnik::geometry::geometry_types::GeometryCollection) //
          ;
    }
} const geometry_type_symbols;

namespace {

auto const assign_name = [](auto const& ctx) {
    std::get<0>(_val(ctx)) = std::move(_attr(ctx));
};
auto const assign_value = [](auto const& ctx) {
    std::get<1>(_val(ctx)) = std::move(_attr(ctx));
};

} // namespace

auto const assign_geometry_type = [](auto const& ctx) {
    std::get<0>(_val(ctx)) = _attr(ctx);
};

auto const create_geometry = [](auto const& ctx) {
    mapnik::geometry::geometry<double> geom;
    auto const type = std::get<0>(_attr(ctx));
    if (type == mapnik::geometry::geometry_types::GeometryCollection)
    {
        _val(ctx) = std::move(std::get<2>(_attr(ctx)));
    }
    else
    {
        auto const& coordinates = std::get<1>(_attr(ctx));
        mapnik::json::create_geometry(geom, type, coordinates);
        _val(ctx) = std::move(geom);
    }
};

auto const assign_geometry = [](auto const& ctx) {
    mapnik::feature_impl& feature = x3::get<grammar::feature_tag>(ctx);
    feature.set_geometry(std::move(_attr(ctx)));
};

auto const push_geometry = [](auto const& ctx) {
    mapnik::geometry::geometry<double> geom;
    auto const type = std::get<0>(_attr(ctx));
    auto const& coordinates = std::get<1>(_attr(ctx));
    mapnik::json::create_geometry(geom, type, coordinates);
    _val(ctx).push_back(std::move(geom));
};

auto const assign_positions = [](auto const& ctx) {
    std::get<1>(_val(ctx)) = std::move(_attr(ctx));
};

auto const assign_collection = [](auto const& ctx) {
    std::get<2>(_val(ctx)) = std::move(_attr(ctx));
};

auto const assign_property = [](auto const& ctx) {
    mapnik::feature_impl& feature = x3::get<grammar::feature_tag>(ctx);
    mapnik::transcoder const& tr = x3::get<grammar::transcoder_tag>(ctx);
    feature.put_new(std::get<0>(_attr(ctx)),
                    mapnik::util::apply_visitor(attribute_value_visitor(tr), std::get<1>(_attr(ctx))));
};

// rules
x3::rule<struct feature_type_tag> const feature_type = "Feature Type";
x3::rule<struct geometry_type_tag, mapnik::geometry::geometry_types> const geometry_type = "Geometry Type";
x3::rule<struct coordinates_tag, mapnik::json::positions> const coordinates = "Coordinates";
x3::rule<struct geomerty_tag,
         std::tuple<mapnik::geometry::geometry_types,
                    mapnik::json::positions,
                    mapnik::geometry::geometry_collection<double>>> const geometry_tuple = "Geometry";
x3::rule<struct property, std::tuple<std::string, json_value>> const property = "Property";
x3::rule<struct properties_tag> const properties = "Properties";
x3::rule<struct feature_part_rule_tag> const feature_part = "Feature part";
x3::rule<struct geometry_collection, mapnik::geometry::geometry_collection<double>> const geometry_collection =
  "GeometryCollection";

// clang-format off
auto const feature_type_def = lit("\"type\"") > lit(':') > lit("\"Feature\"");

auto const geometry_type_def = lit("\"type\"") > lit(':') > geometry_type_symbols;

auto const coordinates_def = lit("\"coordinates\"") > lit(':') > positions_rule;

auto const geometry_collection_def = lit("\"geometries\"") > lit(':')
    > lit('[')
    > ((lit('{') > geometry_tuple[push_geometry] > lit('}')) % lit(','))
    > lit(']');

auto const geometry_tuple_def = (geometry_type[assign_geometry_type]
                                 |
                                 coordinates[assign_positions]
                                 |
                                 geometry_collection[assign_collection]
                                 |
                                 (omit[geojson_string] > lit(':') > omit[value])) % lit(',');


auto const property_def = geojson_string[assign_name] > lit(':') > value[assign_value];

auto const properties_def = property[assign_property] % lit(',');

auto const feature_part_def = feature_type
    |
    (lit("\"geometry\"") > lit(':') >  geometry_rule[assign_geometry])
    |
    (lit("\"properties\"") > lit(':') > ((lit('{') > -properties > lit('}')) | lit("null")))
    |
    (omit[geojson_string] > lit(':') > omit[value])
    ;

auto const feature_rule_def = lit('{') > feature_part % lit(',') > lit('}');

auto const geometry_rule_def = (lit('{') > geometry_tuple[create_geometry] > lit('}')) | lit("null");
// clang-format on

#include <mapnik/warning.hpp>
MAPNIK_DISABLE_WARNING_PUSH
#include <mapnik/warning_ignore.hpp>

BOOST_SPIRIT_DEFINE(feature_type,
                    geometry_type,
                    coordinates,
                    geometry_tuple,
                    property,
                    properties,
                    feature_part,
                    feature_rule,
                    geometry_rule,
                    geometry_collection);
MAPNIK_DISABLE_WARNING_POP

} // namespace grammar
} // namespace json
} // namespace mapnik

#endif // MAPNIK_JSON_FEATURE_GRAMMAR_X3_DEF_HPP
