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#include <cstring>
#include <vector>

#include <openvic-simulation/economy/GoodDefinition.hpp>
#include <openvic-simulation/country/CountryInstance.hpp>
#include <openvic-simulation/economy/production/ProductionType.hpp>
#include <openvic-simulation/economy/production/ResourceGatheringOperation.hpp>
#include <openvic-simulation/pop/Pop.hpp>
#include <openvic-simulation/dataloader/Dataloader.hpp>
#include <openvic-simulation/GameManager.hpp>
#include <openvic-simulation/testing/Testing.hpp>
#include <openvic-simulation/utility/Logger.hpp>

using namespace OpenVic;

static void print_help(std::ostream& stream, char const* program_name) {
   stream
      << "Usage: " << program_name << " [-h] [-t] [-b <path>] [path]+\n"
      << "    -h : Print this help message and exit the program.\n"
      << "    -t : Run tests after loading defines.\n"
      << "    -b : Use the following path as the base directory (instead of searching for one).\n"
      << "    -s : Use the following path as a hint to search for a base directory.\n"
      << "Any following paths are read as mod directories, with priority starting at one above the base directory.\n"
      << "(Paths with spaces need to be enclosed in \"quotes\").\n";
}

static void print_rgo(ProvinceInstance const& province) {
   ResourceGatheringOperation const& rgo = province.get_rgo();
   ProductionType const* const production_type = rgo.get_production_type();
   if (production_type == nullptr) {
      Logger::error(
         "\n    ", province.get_identifier(),
         " - production_type: nullptr"
      );
   }
   else {
      GoodDefinition const& output_good = production_type->get_output_good();
      Logger::info(
         "\n    ", province.get_identifier(),
         " - good: ", output_good.get_identifier(),
         ", production_type: ", production_type->get_identifier(),
         ", size_multiplier: ", rgo.get_size_multiplier().to_string(3),
         ", output_quantity_yesterday: ", rgo.get_output_quantity_yesterday().to_string(3),
         ", revenue_yesterday: ", rgo.get_revenue_yesterday().to_string(3)
      );
   }
}

static bool run_headless(Dataloader::path_vector_t const& roots, bool run_tests) {
   bool ret = true;

   GameManager game_manager { []() {
      Logger::info("State updated");
   }, nullptr };

   Logger::info("===== Loading definitions... =====");
   ret &= game_manager.set_roots(roots);
   ret &= game_manager.load_definitions(
      [](std::string_view key, Dataloader::locale_t locale, std::string_view localisation) -> bool {
         return true;
      }
   );

   if (run_tests) {
      Testing testing { game_manager.get_definition_manager() };
      std::cout << std::endl << "Testing Loaded" << std::endl << std::endl;
      testing.execute_all_scripts();
      testing.report_results();
      std::cout << "Testing Executed" << std::endl << std::endl;
   }

   Logger::info("===== Setting up instance... =====");
   ret &= game_manager.setup_instance(
      game_manager.get_definition_manager().get_history_manager().get_bookmark_manager().get_bookmark_by_index(0)
   );

   Logger::info("===== Starting game session... =====");
   ret &= game_manager.start_game_session();

   // This triggers a gamestate update
   ret &= game_manager.update_clock();

   // TODO - REMOVE TEST CODE
   Logger::info("===== Ranking system test... =====");
   if (game_manager.get_instance_manager()) {
      const auto print_ranking_list = [](std::string_view title, std::vector<CountryInstance*> const& countries) -> void {
         std::string text;
         for (CountryInstance const* country : countries) {
            text += StringUtils::append_string_views(
               "\n    ", country->get_identifier(),
               " - Total #", std::to_string(country->get_total_rank()), " (", country->get_total_score().to_string(1),
               "), Prestige #", std::to_string(country->get_prestige_rank()), " (", country->get_prestige().to_string(1),
               "), Industry #", std::to_string(country->get_industrial_rank()), " (", country->get_industrial_power().to_string(1),
               "), Military #", std::to_string(country->get_military_rank()), " (", country->get_military_power().to_string(1), ")"
            );
         }
         Logger::info(title, ":", text);
      };

      CountryInstanceManager const& country_instance_manager =
         game_manager.get_instance_manager()->get_country_instance_manager();

      std::vector<CountryInstance*> const& great_powers = country_instance_manager.get_great_powers();
      print_ranking_list("Great Powers", great_powers);
      print_ranking_list("Secondary Powers", country_instance_manager.get_secondary_powers());
      print_ranking_list("All countries", country_instance_manager.get_total_ranking());

      Logger::info("===== RGO test... =====");
      for (int i = 0; i < 3; ++i) {
         CountryInstance const* const great_power = great_powers[i];
         if(great_power == nullptr) {
            Logger::warning("Great power ",std::to_string(i), " is null.");
         }
         else {
            ProvinceInstance const* const capital_province = great_power->get_capital();
            if(capital_province == nullptr) {
               Logger::warning(great_power->get_identifier(), " has no capital ProvinceInstance set.");
            }
            else {
               print_rgo(*capital_province);
            }
         }
      }
   } else {
      Logger::error("Instance manager not available!");
      ret = false;
   }

   return ret;
}

/*
   $ program [-h] [-t] [-b] [path]+
*/

int main(int argc, char const* argv[]) {
   Logger::set_logger_funcs();

   char const* program_name = StringUtils::get_filename(argc > 0 ? argv[0] : nullptr, "<program>");
   fs::path root;
   bool run_tests = false;
   int argn = 0;

   /* Reads the next argument and converts it to a path via path_transform. If reading or converting fails, an error
    * message and the help text are displayed, along with returning false to signify the program should exit.
    */
   const auto _read = [&root, &argn, argc, argv, program_name](
      std::string_view command, std::string_view path_use, auto path_transform) -> bool {
      if (root.empty()) {
         if (++argn < argc) {
            char const* path = argv[argn];
            root = path_transform(path);
            if (!root.empty()) {
               return true;
            } else {
               std::cerr << "Empty path after giving \"" << path << "\" to " << path_use
                  << " command line argument \"" << command << "\"." << std::endl;
            }
         } else {
            std::cerr << "Missing path after " << path_use << " command line argument \"" << command << "\"." << std::endl;
         }
      } else {
         std::cerr << "Duplicate " << path_use << " command line argument \"-b\"." << std::endl;
      }
      print_help(std::cerr, program_name);
      return false;
   };

   while (++argn < argc) {
      char const* arg = argv[argn];
      if (strcmp(arg, "-h") == 0) {
         print_help(std::cout, program_name);
         return 0;
      } else if (strcmp(arg, "-t") == 0) {
         run_tests = true;
      } else if (strcmp(arg, "-b") == 0) {
         if (!_read("-b", "base directory", std::identity {})) {
            return -1;
         }
      } else if (strcmp(arg, "-s") == 0) {
         if (!_read("-s", "search hint", Dataloader::search_for_game_path)) {
            return -1;
         }
      } else {
         break;
      }
   }
   if (root.empty()) {
      root = Dataloader::search_for_game_path();
      if (root.empty()) {
         std::cerr << "Search for base directory path failed!" << std::endl;
         print_help(std::cerr, program_name);
         return -1;
      }
   }
   Dataloader::path_vector_t roots { root };
   while (argn < argc) {
      static const fs::path mod_directory = "mod";
      roots.emplace_back(root / mod_directory / argv[argn++]);
   }

   std::cout << "!!! HEADLESS SIMULATION START !!!" << std::endl;

   const bool ret = run_headless(roots, run_tests);

   std::cout << "!!! HEADLESS SIMULATION END !!!" << std::endl;

   std::cout << "\nLoad returned: " << (ret ? "SUCCESS" : "FAILURE") << std::endl;

   std::cout << "\nLogger Summary: Info = " << Logger::get_info_count() << ", Warning = " << Logger::get_warning_count()
      << ", Error = " << Logger::get_error_count() << std::endl;

   return ret ? 0 : -1;
}