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#pragma once

#include <functional>

#include "Region.hpp"

namespace OpenVic {

   struct Mapmode : HasIdentifier {
      friend struct Map;

      using colour_func_t = std::function<colour_t (Map const&, Province const&)>;
      using index_t = size_t;
   private:
      const index_t index;
      const colour_func_t colour_func;

      Mapmode(index_t new_index, std::string const& new_identifier, colour_func_t new_colour_func);
   public:
      index_t get_index() const;
      colour_t get_colour(Map const& map, Province const& province) const;
   };

   struct GoodManager;

   /* REQUIREMENTS:
    * MAP-4
    */
   struct Map {
      using terrain_t = uint8_t;
      using terrain_variant_map_t = std::map<colour_t, terrain_t>;

      #pragma pack(push, 1)
      struct shape_pixel_t {
         index_t index;
         terrain_t terrain;
      };
      #pragma pack(pop)
   private:
      using colour_index_map_t = std::map<colour_t, index_t>;

      IdentifierRegistry<Province> provinces;
      IdentifierRegistry<Region> regions;
      IdentifierRegistry<Mapmode> mapmodes;
      bool water_provinces_locked = false;
      size_t water_province_count = 0;

      size_t width = 0, height = 0;
      std::vector<shape_pixel_t> province_shape_image;
      colour_index_map_t colour_index_map;
      index_t selected_province = NULL_INDEX;

      index_t get_index_from_colour(colour_t colour) const;
   public:
      Map();

      return_t add_province(std::string const& identifier, colour_t colour);
      void lock_provinces();
      return_t set_water_province(std::string const& identifier);
      void lock_water_provinces();
      return_t add_region(std::string const& identifier, std::vector<std::string> const& province_identifiers);
      void lock_regions();

      size_t get_province_count() const;
      Province* get_province_by_index(index_t index);
      Province const* get_province_by_index(index_t index) const;
      Province* get_province_by_identifier(std::string const& identifier);
      Province const* get_province_by_identifier(std::string const& identifier) const;
      index_t get_province_index_at(size_t x, size_t y) const;
      void set_selected_province(index_t index);
      index_t get_selected_province_index() const;
      Province const* get_selected_province() const;

      Region* get_region_by_identifier(std::string const& identifier);
      Region const* get_region_by_identifier(std::string const& identifier) const;

      return_t generate_province_shape_image(size_t new_width, size_t new_height, uint8_t const* colour_data,
         uint8_t const* terrain_data, terrain_variant_map_t const& terrain_variant_map);
      size_t get_width() const;
      size_t get_height() const;
      std::vector<shape_pixel_t> const& get_province_shape_image() const;

      return_t add_mapmode(std::string const& identifier, Mapmode::colour_func_t colour_func);
      void lock_mapmodes();
      size_t get_mapmode_count() const;
      Mapmode const* get_mapmode_by_index(Mapmode::index_t index) const;
      Mapmode const* get_mapmode_by_identifier(std::string const& identifier) const;
      static constexpr size_t MAPMODE_COLOUR_SIZE = 4;
      return_t generate_mapmode_colours(Mapmode::index_t index, uint8_t* target) const;

      return_t setup(GoodManager const& good_manager, BuildingManager const& building_manager);

      void update_state(Date const& today);
      void tick(Date const& today);
   };
}