#include <gtest/gtest.h>
#include <entt/config/config.h>
#include <entt/entity/component.hpp>

struct empty {};

struct non_empty {
    int value;
};

struct non_movable {
    non_movable() = default;
    non_movable(const non_movable &) = delete;
    non_movable &operator=(const non_movable &) = delete;
    int value;
};

struct self_contained {
    static constexpr auto in_place_delete = true;
    static constexpr auto page_size = 4u;
};

struct traits_based {};

template<>
struct entt::component_traits<traits_based> {
    using type = traits_based;
    static constexpr auto in_place_delete = false;
    static constexpr auto page_size = 8u;
};

TEST(Component, VoidType) {
    using traits_type = entt::component_traits<void>;

    static_assert(!traits_type::in_place_delete);
    static_assert(traits_type::page_size == 0u);
}

TEST(Component, Empty) {
    using traits_type = entt::component_traits<empty>;

    static_assert(!traits_type::in_place_delete);
    static_assert(traits_type::page_size == 0u);
}

TEST(Component, NonEmpty) {
    using traits_type = entt::component_traits<non_empty>;

    static_assert(!traits_type::in_place_delete);
    static_assert(traits_type::page_size == ENTT_PACKED_PAGE);
}

TEST(Component, NonMovable) {
    using traits_type = entt::component_traits<non_movable>;

    static_assert(traits_type::in_place_delete);
    static_assert(traits_type::page_size == ENTT_PACKED_PAGE);
}

TEST(Component, SelfContained) {
    using traits_type = entt::component_traits<self_contained>;

    static_assert(traits_type::in_place_delete);
    static_assert(traits_type::page_size == 4u);
}

TEST(Component, TraitsBased) {
    using traits_type = entt::component_traits<traits_based>;

    static_assert(!traits_type::in_place_delete);
    static_assert(traits_type::page_size == 8u);
}