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path: root/src/openvic-simulation/map/TerrainType.cpp
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#include "TerrainType.hpp"

#include <limits>

#include "openvic-simulation/types/Colour.hpp"

using namespace OpenVic;
using namespace OpenVic::NodeTools;

TerrainType::TerrainType(
   std::string_view new_identifier, colour_t new_colour, ModifierValue&& new_modifier, bool new_is_water
) : HasIdentifierAndColour { new_identifier, new_colour, false }, modifier { std::move(new_modifier) },
   is_water { new_is_water } {}

TerrainTypeMapping::TerrainTypeMapping(
   std::string_view new_identifier, TerrainType const& new_type, std::vector<index_t>&& new_terrain_indicies,
   index_t new_priority, bool new_has_texture
) : HasIdentifier { new_identifier }, type { new_type }, terrain_indices { std::move(new_terrain_indicies) },
   priority { new_priority }, has_texture { new_has_texture } {}

bool TerrainTypeManager::add_terrain_type(
   std::string_view identifier, colour_t colour, ModifierValue&& values, bool is_water
) {
   if (identifier.empty()) {
      Logger::error("Invalid terrain type identifier - empty!");
      return false;
   }
   return terrain_types.add_item({ identifier, colour, std::move(values), is_water });
}

bool TerrainTypeManager::add_terrain_type_mapping(
   std::string_view identifier, TerrainType const* type, std::vector<TerrainTypeMapping::index_t>&& terrain_indicies,
   TerrainTypeMapping::index_t priority, bool has_texture
) {
   if (!terrain_types_are_locked()) {
      Logger::error("Cannot register terrain type mappings until terrain types are locked!");
      return false;
   }
   if (identifier.empty()) {
      Logger::error("Invalid terrain type mapping identifier - empty!");
      return false;
   }
   if (type == nullptr) {
      Logger::error("Null terrain type for mapping ", identifier);
      return false;
   }
   bool ret = true;
   for (TerrainTypeMapping::index_t idx : terrain_indicies) {
      const terrain_type_mappings_map_t::const_iterator it = terrain_type_mappings_map.find(idx);
      if (it == terrain_type_mappings_map.end()) {
         terrain_type_mappings_map.emplace(idx, terrain_type_mappings.size());
      } else {
         Logger::error(
            "Terrain index ", static_cast<size_t>(idx), " cannot map to ", identifier, " as it already maps to ",
            terrain_type_mappings.get_item_by_index(it->second)
         );
         ret = false;
      }
   }
   ret &= terrain_type_mappings.add_item({ identifier, *type, std::move(terrain_indicies), priority, has_texture });
   return ret;
}

node_callback_t TerrainTypeManager::_load_terrain_type_categories(ModifierManager const& modifier_manager) {
   return [this, &modifier_manager](ast::NodeCPtr root) -> bool {
      const bool ret = expect_dictionary_reserve_length(terrain_types,
         [this, &modifier_manager](std::string_view type_key, ast::NodeCPtr type_node) -> bool {
            ModifierValue values;
            colour_t colour = colour_t::null();
            bool is_water = false;
            bool ret = modifier_manager.expect_modifier_value_and_keys(move_variable_callback(values),
               "color", ONE_EXACTLY, expect_colour(assign_variable_callback(colour)),
               "is_water", ZERO_OR_ONE, expect_bool(assign_variable_callback(is_water))
            )(type_node);
            ret &= add_terrain_type(type_key, colour, std::move(values), is_water);
            return ret;
         }
      )(root);
      lock_terrain_types();
      return ret;
   };
}

bool TerrainTypeManager::_load_terrain_type_mapping(std::string_view mapping_key, ast::NodeCPtr mapping_value) {
   if (terrain_texture_limit <= 0) {
      Logger::error("Cannot define terrain type mapping before terrain texture limit: ", mapping_key);
      return false;
   }
   if (!terrain_types_are_locked()) {
      Logger::error("Cannot define terrain type mapping before categories: ", mapping_key);
      return false;
   }
   TerrainType const* type = nullptr;
   std::vector<TerrainTypeMapping::index_t> terrain_indicies;
   TerrainTypeMapping::index_t priority = 0;
   bool has_texture = true;

   bool ret = expect_dictionary_keys(
      "type", ONE_EXACTLY, expect_terrain_type_identifier(assign_variable_callback_pointer(type)),
      "color", ONE_EXACTLY, expect_list_reserve_length(terrain_indicies, expect_uint<TerrainTypeMapping::index_t>(
         [&terrain_indicies](TerrainTypeMapping::index_t val) -> bool {
            if (std::find(terrain_indicies.begin(), terrain_indicies.end(), val) == terrain_indicies.end()) {
               terrain_indicies.push_back(val);
               return true;
            }
            Logger::error("Repeat terrain type mapping index: ", val);
            return false;
         }
      )),
      "priority", ZERO_OR_ONE, expect_uint(assign_variable_callback(priority)),
      "has_texture", ZERO_OR_ONE, expect_bool(assign_variable_callback(has_texture))
   )(mapping_value);
   if (has_texture && ++terrain_texture_count == terrain_texture_limit + 1) {
      Logger::warning("More terrain textures than limit!");
   }
   ret &= add_terrain_type_mapping(mapping_key, type, std::move(terrain_indicies), priority, has_texture);
   return true;
}

TerrainTypeMapping const* TerrainTypeManager::get_terrain_type_mapping_for(TerrainTypeMapping::index_t idx) const {
   const terrain_type_mappings_map_t::const_iterator it = terrain_type_mappings_map.find(idx);
   if (it != terrain_type_mappings_map.end()) {
      return terrain_type_mappings.get_item_by_index(it->second);
   }
   return nullptr;
}

TerrainTypeMapping::index_t TerrainTypeManager::get_terrain_texture_limit() const {
   return terrain_texture_limit;
}

bool TerrainTypeManager::load_terrain_types(ModifierManager const& modifier_manager, ast::NodeCPtr root) {
   const bool ret = expect_dictionary_keys_reserve_length_and_default(
      terrain_type_mappings,
      std::bind_front(&TerrainTypeManager::_load_terrain_type_mapping, this),
      "terrain", ONE_EXACTLY, expect_uint(assign_variable_callback(terrain_texture_limit)),
      "categories", ONE_EXACTLY, _load_terrain_type_categories(modifier_manager)
   )(root);
   lock_terrain_type_mappings();
   return ret;
}