#include "game_level.hpp"
#include "components.hpp"
#include "worldbuilder.hpp"
#include "constants.hpp"
#include "save.hpp"
#include "systems.hpp"
#include "components.hpp"
#include "rituals.hpp"

using lighting::LightRender;
using std::shared_ptr, std::make_shared;
using namespace components;

struct LevelScaling {
  int map_width=20;
  int map_height=20;
};

struct LevelManager {
  public:
  std::vector<GameLevel> levels;
  size_t current_level = 0;
};

inline shared_ptr<DinkyECS::World> clone_load_world(shared_ptr<DinkyECS::World> prev_world)
{
  auto world = make_shared<DinkyECS::World>();

  if(prev_world == nullptr) {
    save::load_configs(*world);
  } else {
    prev_world->clone_into(*world);
  }

  return world;
}

namespace Game {
  using std::shared_ptr, std::string, std::make_shared;

  shared_ptr<LevelManager> LMGR;
  bool initialized = false;

  void init() {
    components::init();
    textures::init();

    if(!initialized) {
      LMGR = make_shared<LevelManager>();
      initialized = true;
      new_level(NULL);
    }
  }

  LevelScaling scale_level() {
    return {
      INITIAL_MAP_W + int(LMGR->current_level * 2),
      INITIAL_MAP_H + int(LMGR->current_level * 2)
    };
  }

  shared_ptr<DinkyECS::World> current_world() {
    dbc::check(initialized, "Forgot to call Game::init()");
    return current().world;
  }

  shared_ptr<gui::BossFightUI> create_bossfight() {
    dbc::check(initialized, "Forgot to call Game::init()");
    auto prev_world = current_world();
    dbc::check(prev_world != nullptr, "Starter world for boss fights can't be null.");
    auto world = clone_load_world(prev_world);
    auto& config = prev_world->get_the<GameConfig>();

    // BUG: the jank is too strong here
    auto boss_names = config.bosses.keys();
    auto& level_name = boss_names[LMGR->current_level % boss_names.size()];
    auto& boss_data = config.bosses[level_name];

    auto boss_id = world->entity();
    components::configure_entity(*world, boss_id, boss_data["components"]);

    return make_shared<gui::BossFightUI>(world, boss_id);
  }

  size_t new_level(std::shared_ptr<DinkyECS::World> prev_world) {
    dbc::check(initialized, "Forgot to call Game::init()");
    auto world = clone_load_world(prev_world);

    auto scaling = scale_level();

    auto map = make_shared<Map>(scaling.map_width, scaling.map_height);
    auto collision = std::make_shared<SpatialMap>();

    WorldBuilder builder(*map, *collision);
    builder.generate(*world);

    size_t index = LMGR->levels.size();

    auto player = world->get_the<Player>();

    LMGR->levels.emplace_back(index, player.entity, map, world,
        make_shared<LightRender>(map->tiles()), collision);

    dbc::check(index == LMGR->levels.size() - 1, "Level index is not the same as LMGR->levels.size() - 1, off by one error");

    return index;
  }

  GameLevel& create_level() {
    dbc::log("current_level");
    size_t level = new_level(current_world());
    dbc::check(level == LMGR->current_level + 1, "new level index is wrong");
    auto& the_level = next();
    dbc::check(level == LMGR->current_level, "level didn't update?!");
    return the_level;
  }

  GameLevel &next() {
    dbc::check(initialized, "Forgot to call Game::init()");
    dbc::check(LMGR->current_level < LMGR->levels.size(), "attempt to get next level when at end");
    LMGR->current_level++;
    return LMGR->levels.at(LMGR->current_level);
  }

  GameLevel &previous() {
    dbc::check(initialized, "Forgot to call Game::init()");
    dbc::check(LMGR->current_level > 0, "attempt to go to previous level when at 0");
    LMGR->current_level--;
    return LMGR->levels.at(LMGR->current_level);
  }

  GameLevel &current() {
    dbc::check(initialized, "Forgot to call Game::init()");
    return LMGR->levels.at(LMGR->current_level);
  }

  size_t current_index() {
    dbc::check(initialized, "Forgot to call Game::init()");
    return LMGR->current_level;
  }

  GameLevel &get(size_t index) {
    dbc::check(initialized, "Forgot to call Game::init()");
    return LMGR->levels.at(index);
  }

  DinkyECS::Entity spawn_enemy(const std::string& named) {
    (void)named;
    dbc::check(initialized, "Forgot to call Game::init()");
    dbc::sentinel("THIS IS BROKEN");
  }

  components::Position& player_position() {
    dbc::check(initialized, "Forgot to call Game::init()");
    auto world = current_world();
    auto& player = world->get_the<components::Player>();
    return world->get<components::Position>(player.entity);
  }

  DinkyECS::Entity the_player() {
    dbc::check(initialized, "Forgot to call Game::init()");
    return current().player;
  }
}