#include <gtest/gtest.h>

#include <XCEngine/Physics/PhysicsWorld.h>
#include <XCEngine/Scene/Scene.h>

namespace {

TEST(PhysicsWorld_Test, DefaultWorldStartsUninitialized) {
    XCEngine::Physics::PhysicsWorld world;

    EXPECT_FALSE(world.IsInitialized());
}

TEST(PhysicsWorld_Test, InitializeStoresCreateInfoWithoutMarkingWorldReadyYet) {
    XCEngine::Components::Scene scene("PhysicsScene");
    XCEngine::Physics::PhysicsWorld world;
    XCEngine::Physics::PhysicsWorldCreateInfo createInfo;
    createInfo.scene = &scene;
    createInfo.gravity = XCEngine::Math::Vector3(0.0f, -3.5f, 0.0f);

    const bool expectedInitialized = XCEngine::Physics::PhysicsWorld::IsPhysXAvailable();

    EXPECT_EQ(world.Initialize(createInfo), expectedInitialized);
    EXPECT_EQ(world.IsInitialized(), expectedInitialized);
    EXPECT_EQ(world.GetCreateInfo().scene, &scene);
    EXPECT_EQ(world.GetCreateInfo().gravity, XCEngine::Math::Vector3(0.0f, -3.5f, 0.0f));
}

TEST(PhysicsWorld_Test, StepWithoutInitializationIsNoOp) {
    XCEngine::Physics::PhysicsWorld world;

    world.Step(0.016f);

    EXPECT_FALSE(world.IsInitialized());
}

} // namespace