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#include "Building.hpp"

#include <cassert>

#include "openvic-simulation/map/Province.hpp"
#include "openvic-simulation/utility/Logger.hpp"

using namespace OpenVic;

Building::Building(BuildingType const& new_type)
   : HasIdentifier { new_type.get_identifier() },
     type { new_type } {}

bool Building::_can_expand() const {
   return level < type.get_max_level();
}

BuildingType const& Building::get_type() const {
   return type;
}

Building::level_t Building::get_level() const {
   return level;
}

Building::ExpansionState Building::get_expansion_state() const {
   return expansion_state;
}

Date const& Building::get_start_date() const {
   return start;
}

Date const& Building::get_end_date() const {
   return end;
}

float Building::get_expansion_progress() const {
   return expansion_progress;
}

bool Building::expand() {
   if (expansion_state == ExpansionState::CanExpand) {
      expansion_state = ExpansionState::Preparing;
      expansion_progress = 0.0f;
      return true;
   }
   return false;
}

/* REQUIREMENTS:
 * MAP-71, MAP-74, MAP-77
 */
void Building::update_state(Date const& today) {
   switch (expansion_state) {
      case ExpansionState::Preparing:
         start = today;
         end = start + type.get_build_time();
         break;
      case ExpansionState::Expanding:
         expansion_progress = static_cast<double>(today - start) / static_cast<double>(end - start);
         break;
      default: expansion_state = _can_expand() ? ExpansionState::CanExpand : ExpansionState::CannotExpand;
   }
}

void Building::tick(Date const& today) {
   if (expansion_state == ExpansionState::Preparing) {
      expansion_state = ExpansionState::Expanding;
   }
   if (expansion_state == ExpansionState::Expanding) {
      if (end <= today) {
         level++;
         expansion_state = ExpansionState::CannotExpand;
      }
   }
}

BuildingType::BuildingType(const std::string_view new_identifier, Building::level_t new_max_level, Timespan new_build_time)
   : HasIdentifier { new_identifier },
     max_level { new_max_level },
     build_time { new_build_time } {
   assert(max_level >= 0);
   assert(build_time >= 0);
}

Building::level_t BuildingType::get_max_level() const {
   return max_level;
}

Timespan BuildingType::get_build_time() const {
   return build_time;
}

BuildingManager::BuildingManager() : building_types { "building types" } {}

bool BuildingManager::add_building_type(const std::string_view identifier, Building::level_t max_level, Timespan build_time) {
   if (identifier.empty()) {
      Logger::error("Invalid building type identifier - empty!");
      return false;
   }
   if (max_level < 0) {
      Logger::error("Invalid building type max level for ", identifier, ": ", max_level);
      return false;
   }
   if (build_time < 0) {
      Logger::error("Invalid building type build time for ", identifier, ": ", build_time);
      return false;
   }
   return building_types.add_item({ identifier, max_level, build_time });
}

bool BuildingManager::generate_province_buildings(Province& province) const {
   province.reset_buildings();
   if (!building_types.is_locked()) {
      Logger::error("Cannot generate buildings until building types are locked!");
      return false;
   }
   bool ret = true;
   if (!province.is_water()) {
      for (BuildingType const& type : building_types.get_items()) {
         ret &= province.add_building({ type });
      }
   }
   province.lock_buildings();
   return ret;
}