#include <gtest/gtest.h>

#include <XCEngine/Components/ComponentFactoryRegistry.h>
#include <XCEngine/Components/GameObject.h>
#include <XCEngine/Scene/Scene.h>
#include <XCEngine/Scripting/ScriptComponent.h>

#include <sstream>

using namespace XCEngine::Components;
using namespace XCEngine::Scripting;

namespace {

TEST(ScriptComponent_Test, DefaultsAreInitializedForNativeDataLayer) {
    ScriptComponent component;

    EXPECT_EQ(component.GetName(), "ScriptComponent");
    EXPECT_NE(component.GetScriptComponentUUID(), 0u);
    EXPECT_EQ(component.GetAssemblyName(), "GameScripts");
    EXPECT_TRUE(component.GetNamespaceName().empty());
    EXPECT_TRUE(component.GetClassName().empty());
    EXPECT_FALSE(component.HasScriptClass());
    EXPECT_TRUE(component.GetFullClassName().empty());
    EXPECT_EQ(component.GetFieldStorage().GetFieldCount(), 0u);
}

TEST(ScriptComponent_Test, FullClassNameComposesNamespaceAndClassName) {
    ScriptComponent component;

    component.SetScriptClass("Gameplay.Characters", "PlayerController");
    EXPECT_EQ(component.GetFullClassName(), "Gameplay.Characters.PlayerController");

    component.SetScriptClass("", "Mover");
    EXPECT_EQ(component.GetFullClassName(), "Mover");
}

TEST(ScriptComponent_Test, SerializeRoundTripPreservesMetadataAndFields) {
    ScriptComponent original;
    original.SetScriptClass("GameScripts.Runtime", "Gameplay.Characters", "PlayerController");
    ASSERT_TRUE(original.GetFieldStorage().SetFieldValue("DisplayName", std::string("Hero=One;Ready|100%")));
    ASSERT_TRUE(original.GetFieldStorage().SetFieldValue("MoveSpeed", 6.25f));
    ASSERT_TRUE(original.GetFieldStorage().SetFieldValue("Target", GameObjectReference{9988}));
    ASSERT_TRUE(original.GetFieldStorage().SetFieldValue("TargetCamera", ComponentReference{9988, 0}));

    std::ostringstream stream;
    original.Serialize(stream);

    ScriptComponent restored;
    std::istringstream input(stream.str());
    restored.Deserialize(input);

    std::string displayName;
    float moveSpeed = 0.0f;
    GameObjectReference target;
    ComponentReference targetCamera;

    EXPECT_EQ(restored.GetScriptComponentUUID(), original.GetScriptComponentUUID());
    EXPECT_EQ(restored.GetAssemblyName(), "GameScripts.Runtime");
    EXPECT_EQ(restored.GetNamespaceName(), "Gameplay.Characters");
    EXPECT_EQ(restored.GetClassName(), "PlayerController");
    EXPECT_EQ(restored.GetFullClassName(), "Gameplay.Characters.PlayerController");
    EXPECT_TRUE(restored.GetFieldStorage().TryGetFieldValue("DisplayName", displayName));
    EXPECT_TRUE(restored.GetFieldStorage().TryGetFieldValue("MoveSpeed", moveSpeed));
    EXPECT_TRUE(restored.GetFieldStorage().TryGetFieldValue("Target", target));
    EXPECT_TRUE(restored.GetFieldStorage().TryGetFieldValue("TargetCamera", targetCamera));
    EXPECT_EQ(displayName, "Hero=One;Ready|100%");
    EXPECT_FLOAT_EQ(moveSpeed, 6.25f);
    EXPECT_EQ(target, GameObjectReference{9988});
    EXPECT_EQ(targetCamera, (ComponentReference{9988, 0}));
}

TEST(ScriptComponent_Test, ComponentFactoryRegistryCreatesScriptComponents) {
    GameObject gameObject("ScriptHost");
    auto& registry = ComponentFactoryRegistry::Get();

    EXPECT_TRUE(registry.IsRegistered("ScriptComponent"));

    ScriptComponent* created = dynamic_cast<ScriptComponent*>(registry.CreateComponent(&gameObject, "ScriptComponent"));
    ASSERT_NE(created, nullptr);
    EXPECT_EQ(gameObject.GetComponents<ScriptComponent>().size(), 1u);
}

TEST(ScriptComponent_Test, GameObjectCanOwnMultipleScriptComponents) {
    GameObject gameObject("ScriptHost");

    ScriptComponent* first = gameObject.AddComponent<ScriptComponent>();
    ScriptComponent* second = gameObject.AddComponent<ScriptComponent>();

    ASSERT_NE(first, nullptr);
    ASSERT_NE(second, nullptr);
    EXPECT_NE(first, second);
    EXPECT_EQ(gameObject.GetComponents<ScriptComponent>().size(), 2u);
}

TEST(ScriptComponent_Test, SceneRoundTripPreservesMultipleScriptComponentsAndFields) {
    Scene scene("Script Scene");
    GameObject* host = scene.CreateGameObject("Host");
    GameObject* targetObject = scene.CreateGameObject("Target");

    ScriptComponent* movement = host->AddComponent<ScriptComponent>();
    movement->SetScriptClass("GameScripts", "Gameplay", "MovementController");
    ASSERT_TRUE(movement->GetFieldStorage().SetFieldValue("Speed", 4.25f));
    ASSERT_TRUE(movement->GetFieldStorage().SetFieldValue("Target", GameObjectReference{targetObject->GetUUID()}));

    ScriptComponent* inventory = host->AddComponent<ScriptComponent>();
    inventory->SetScriptClass("GameScripts", "Gameplay.Inventory", "InventoryWatcher");
    ASSERT_TRUE(inventory->GetFieldStorage().SetFieldValue("Label", std::string("Player|One;Ready=1")));
    ASSERT_TRUE(inventory->GetFieldStorage().SetFieldValue("Slots", int32_t(24)));

    const uint64_t movementUUID = movement->GetScriptComponentUUID();
    const uint64_t inventoryUUID = inventory->GetScriptComponentUUID();

    Scene loadedScene;
    loadedScene.DeserializeFromString(scene.SerializeToString());

    GameObject* loadedHost = loadedScene.Find("Host");
    GameObject* loadedTarget = loadedScene.Find("Target");
    ASSERT_NE(loadedHost, nullptr);
    ASSERT_NE(loadedTarget, nullptr);

    std::vector<ScriptComponent*> loadedScripts = loadedHost->GetComponents<ScriptComponent>();
    ASSERT_EQ(loadedScripts.size(), 2u);

    float speed = 0.0f;
    GameObjectReference loadedReference;
    std::string label;
    int32_t slots = 0;

    EXPECT_EQ(loadedScripts[0]->GetScriptComponentUUID(), movementUUID);
    EXPECT_EQ(loadedScripts[0]->GetAssemblyName(), "GameScripts");
    EXPECT_EQ(loadedScripts[0]->GetFullClassName(), "Gameplay.MovementController");
    EXPECT_TRUE(loadedScripts[0]->GetFieldStorage().TryGetFieldValue("Speed", speed));
    EXPECT_TRUE(loadedScripts[0]->GetFieldStorage().TryGetFieldValue("Target", loadedReference));
    EXPECT_FLOAT_EQ(speed, 4.25f);
    EXPECT_EQ(loadedReference, GameObjectReference{loadedTarget->GetUUID()});

    EXPECT_EQ(loadedScripts[1]->GetScriptComponentUUID(), inventoryUUID);
    EXPECT_EQ(loadedScripts[1]->GetAssemblyName(), "GameScripts");
    EXPECT_EQ(loadedScripts[1]->GetFullClassName(), "Gameplay.Inventory.InventoryWatcher");
    EXPECT_TRUE(loadedScripts[1]->GetFieldStorage().TryGetFieldValue("Label", label));
    EXPECT_TRUE(loadedScripts[1]->GetFieldStorage().TryGetFieldValue("Slots", slots));
    EXPECT_EQ(label, "Player|One;Ready=1");
    EXPECT_EQ(slots, 24);
}

} // namespace