#include <catch2/catch_test_macros.hpp>
#include <fmt/core.h>
#include "game/systems.hpp"
#include <cmath>
#include <numbers>
#include "game/registry.hpp"

using components::Position;

TEST_CASE("figure out best rotation direction", "[systems-rotate]") {
  Matrix map = matrix::make(3, 3);

  Point player_at{1, 1};
  map[player_at.y][player_at.x] = 2;


  for(matrix::box target{map, player_at.x, player_at.y, 1}; target.next();) {
    for(matrix::box aiming_at{map, player_at.x, player_at.y, 1}; aiming_at.next();) {
      map[aiming_at.y][aiming_at.x] = 10;

      float target_dx = float(player_at.x) - float(target.x);
      float target_dy = float(player_at.y) - float(target.y);
      float aiming_dx = float(player_at.x) - float(aiming_at.x);
      float aiming_dy = float(player_at.y) - float(aiming_at.y);

      float target_angle = atan2(-target_dy, target_dx) * (180.0 / std::numbers::pi);
      float aiming_angle = atan2(-aiming_dy, aiming_dx) * (180.0 / std::numbers::pi);

      float diff = target_angle - aiming_angle;
      double normalized = fmod(diff + 360.0, 360.0);

      REQUIRE(normalized >= 0);
      REQUIRE(normalized <= 360);

      map[aiming_at.y][aiming_at.x] = 0;
    }
  }
}


void test_moving(Position& move_to) {
  fmt::println("MOVING: {},{}", move_to.location.x, move_to.location.y);
}

void test_combat(int attack_id) {
  fmt::println("ATTACK: {}", attack_id);
}

void test_render() {
  fmt::println("RENDER");
}

void test_update() {
  fmt::println("UPDATE");
}

void test_use_item(const std::string& slot_name) {
  fmt::println("USE ITEM {}", slot_name);
}

void test_pickup() {
  fmt::println("PICKUP");
}

TEST_CASE("new system running engine thing", "[systems-engine]") {
  System::Registry systems;

  systems.addMoving(test_moving);
  systems.addCombat(test_combat);
  systems.addRender(test_render);
  systems.addUpdate(test_update);
  systems.addUseItem(test_use_item);
  systems.addPickup(test_pickup);

  systems.runCombat(1);
  systems.runMoving({1,1});
  systems.runRender();
  systems.runUpdate();
  systems.runUseItem("hand_l");
  systems.runPickup();
}