#include <gtest/gtest.h>
#include <entt/entity/entity.hpp>
#include <entt/entity/registry.hpp>
#include "types.h"

extern typename entt::component int_type();
extern typename entt::component char_type();

extern void update_position(int, entt::registry &);
extern void assign_velocity(int, entt::registry &);

TEST(Lib, Types) {
    entt::registry registry;

    ASSERT_EQ(registry.type<int>(), registry.type<const int>());
    ASSERT_EQ(registry.type<char>(), registry.type<const char>());

    ASSERT_EQ(registry.type<int>(), int_type());
    ASSERT_EQ(registry.type<char>(), char_type());

    ASSERT_EQ(registry.type<const char>(), char_type());
    ASSERT_EQ(registry.type<const int>(), int_type());
}

TEST(Lib, Registry) {
    entt::registry registry;

    for(auto i = 0; i < 3; ++i) {
        const auto entity = registry.create();
        registry.assign<position>(entity, i, i+1);
    }

    assign_velocity(2, registry);

    ASSERT_EQ(registry.size<position>(), entt::registry::size_type{3});
    ASSERT_EQ(registry.size<velocity>(), entt::registry::size_type{3});

    update_position(1, registry);

    registry.view<position>().each([](auto entity, auto &position) {
        ASSERT_EQ(position.x, entt::to_integer(entity) + 2);
        ASSERT_EQ(position.y, entt::to_integer(entity) + 3);
    });
}