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path: root/extension/src/MapSingleton.cpp
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#include "MapSingleton.hpp"

#include <godot_cpp/variant/utility_functions.hpp>
#include <godot_cpp/classes/file_access.hpp>
#include <godot_cpp/classes/json.hpp>

using namespace godot;
using namespace OpenVic2;

MapSingleton* MapSingleton::singleton = nullptr;

void MapSingleton::_bind_methods() {
   ClassDB::bind_method(D_METHOD("load_province_identifier_file", "file_path"), &MapSingleton::load_province_identifier_file);
   ClassDB::bind_method(D_METHOD("load_province_shape_file", "file_path"), &MapSingleton::load_province_shape_file);
   ClassDB::bind_method(D_METHOD("get_province_shape_image"), &MapSingleton::get_province_shape_image);
}

MapSingleton* MapSingleton::get_singleton() {
   return singleton;
}

MapSingleton::MapSingleton() {
   ERR_FAIL_COND(singleton != nullptr);
   singleton = this;
}

MapSingleton::~MapSingleton() {
   ERR_FAIL_COND(singleton != this);
   singleton = nullptr;
}

Error MapSingleton::load_province_identifier_file(String const& file_path) {
   UtilityFunctions::print("Loading identifier file: ", file_path);
   Ref<FileAccess> file = FileAccess::open(file_path, FileAccess::ModeFlags::READ);
   Error err = FileAccess::get_open_error();
   if (err != OK || file.is_null()) {
      UtilityFunctions::push_error("Failed to load province identifier file: ", file_path);
      return err == OK ? FAILED : err;
   }
   String json_string = file->get_as_text();
   Ref<JSON> json;
   json.instantiate();
   err = json->parse(json_string);
   if (err) {
      UtilityFunctions::push_error("Failed to parse province identifier file as JSON: ", file_path,
         "\nError at line ", json->get_error_line(), ": ", json->get_error_message());
      return err;
   }
   Variant json_var = json->get_data();
   Variant::Type type = json_var.get_type();
   if (type != Variant::DICTIONARY) {
      UtilityFunctions::push_error("Invalid province identifier JSON: root has type ",
         Variant::get_type_name(type), " (expected Dictionary)");
      return FAILED;
   }
   Dictionary prov_dict = json_var;
   Array prov_identifiers = prov_dict.keys();
   for (int idx = 0; idx < prov_identifiers.size(); ++idx) {
      String const& identifier = prov_identifiers[idx];
      Variant const& colour_var = prov_dict[identifier];
      if (identifier.is_empty()) {
         UtilityFunctions::push_error("Empty province identifier with colour: ", colour_var);
         err = FAILED;
         continue;
      }
      static const String prov_prefix = "prov_";
      if (!identifier.begins_with(prov_prefix))
         UtilityFunctions::push_warning("Province identifier missing prefix: ", identifier);
      type = colour_var.get_type();
      Province::colour_t colour = Province::NULL_COLOUR;
      if (type == Variant::ARRAY) {
         Array colour_array = colour_var;
         if (colour_array.size() == 3) {
            for (int jdx = 0; jdx < 3; ++jdx) {
               Variant var = colour_array[jdx];
               if (var.get_type() != Variant::FLOAT) {
                  colour = Province::NULL_COLOUR;
                  break;
               }
               double colour_double = var;
               if (std::trunc(colour_double) != colour_double) {
                  colour = Province::NULL_COLOUR;
                  break;
               }
               int64_t colour_int = static_cast<int64_t>(colour_double);
               if (colour_int < 0 || colour_int > 255) {
                  colour = Province::NULL_COLOUR;
                  break;
               }
               colour = (colour << 8) | colour_int;
            }
         }
      } else if (type == Variant::STRING) {
         String colour_string = colour_var;
         if (colour_string.is_valid_hex_number()) {
            int64_t colour_int = colour_string.hex_to_int();
            if (0 <= colour_int && colour_int <= 0xFFFFFF)
               colour = colour_int;
         }
      }
      if (colour == Province::NULL_COLOUR) {
         UtilityFunctions::push_error("Invalid province identifier colour for ", identifier, ": ", colour_var);
         err = FAILED;
         continue;
      }
      std::string error_message;
      if (map.add_province(identifier.utf8().get_data(), colour, error_message)) {
         UtilityFunctions::print(error_message.c_str());
      } else {
         UtilityFunctions::push_error(error_message.c_str());
         err = FAILED;
      }
   }
   return err;
}

Error MapSingleton::load_province_shape_file(String const& file_path) {
   if (province_shape_image.is_valid()) {
      UtilityFunctions::push_error("Province shape file has already been loaded, cannot load: ", file_path);
      return FAILED;
   }
   province_shape_image.instantiate();
   Error err = province_shape_image->load(file_path);
   if (err != OK) {
      UtilityFunctions::push_error("Failed to load province shape file: ", file_path);
      province_shape_image.unref();
      return err;
   }
   int32_t width = province_shape_image->get_width();
   int32_t height = province_shape_image->get_height();
   if (width < 1 || height < 1) {
      UtilityFunctions::push_error("Invalid dimensions (", width, "x", height, ") for province shape file: ", file_path);
      err = FAILED;
   }
   static const Image::Format expected_format = Image::Format::FORMAT_RGB8; 
   Image::Format format = province_shape_image->get_format();
   if (format != expected_format) {
      UtilityFunctions::push_error("Invalid format (", format, ", should be ", expected_format, ") for province shape file: ", file_path);
      err = FAILED;
   }
   if (err) {
      province_shape_image.unref();
      return err;
   }
   return err;
}

Ref<Image> MapSingleton::get_province_shape_image() const {
   return province_shape_image;
}