#include <cstdint>
#include <stdexcept>
#include <type_traits>

#include <gtest/gtest.h>

#include <fesa/core/entity_id.hpp>

namespace {

struct NodeTag;
struct ElementTag;

using NodeId = fesa::EntityId<NodeTag>;
using ElementId = fesa::EntityId<ElementTag>;

static_assert(std::is_constructible_v<NodeId, std::int64_t>);
static_assert(!std::is_convertible_v<std::int64_t, NodeId>);
static_assert(!std::is_convertible_v<NodeId, ElementId>);

TEST(EntityId, PreservesValueAndSupportsTypedOrdering) {
    constexpr NodeId first{7};
    constexpr NodeId second{11};

    static_assert(first.value() == 7);
    static_assert(first < second);

    EXPECT_EQ(first.value(), 7);
    EXPECT_LT(first, second);
}

TEST(EntityId, RejectsNegativeValues) {
    EXPECT_THROW((NodeId{-1}), std::invalid_argument);
}

}  // namespace