#include "Scripting/ScriptEngine.h"

#include "Components/GameObject.h"
#include "Scene/Scene.h"
#include "Scripting/ScriptComponent.h"

#include <algorithm>

namespace XCEngine {
namespace Scripting {

namespace {

std::unordered_map<std::string, ScriptFieldValue> CollectClassDefaultValues(
    const IScriptRuntime* runtime,
    const ScriptComponent* component,
    ScriptFieldClassStatus classStatus) {
    std::unordered_map<std::string, ScriptFieldValue> defaultValues;
    if (!runtime || !component || classStatus != ScriptFieldClassStatus::Available || !component->HasScriptClass()) {
        return defaultValues;
    }

    std::vector<ScriptFieldDefaultValue> fields;
    if (!runtime->TryGetClassFieldDefaultValues(
            component->GetAssemblyName(),
            component->GetNamespaceName(),
            component->GetClassName(),
            fields)) {
        return defaultValues;
    }

    defaultValues.reserve(fields.size());
    for (const ScriptFieldDefaultValue& field : fields) {
        if (field.fieldName.empty() || !IsScriptFieldValueCompatible(field.type, field.value)) {
            continue;
        }

        defaultValues.emplace(field.fieldName, field.value);
    }

    return defaultValues;
}

ScriptFieldValue ResolveScriptFieldDefaultValue(
    const ScriptFieldMetadata& metadata,
    const std::unordered_map<std::string, ScriptFieldValue>& defaultValues) {
    const auto it = defaultValues.find(metadata.name);
    if (it != defaultValues.end() && IsScriptFieldValueCompatible(metadata.type, it->second)) {
        return it->second;
    }

    return CreateDefaultScriptFieldValue(metadata.type);
}

} // namespace

ScriptEngine& ScriptEngine::Get() {
    static ScriptEngine instance;
    return instance;
}

void ScriptEngine::SetRuntime(IScriptRuntime* runtime) {
    m_runtime = runtime ? runtime : &m_nullRuntime;
}

void ScriptEngine::SetRuntimeFixedDeltaTime(float fixedDeltaTime) {
    if (fixedDeltaTime > 0.0f) {
        m_runtimeFixedDeltaTime = fixedDeltaTime;
        return;
    }

    m_runtimeFixedDeltaTime = DefaultFixedDeltaTime;
}

void ScriptEngine::OnRuntimeStart(Components::Scene* scene) {
    const float configuredFixedDeltaTime = m_runtimeFixedDeltaTime;
    Physics::PhysicsWorld* configuredPhysicsWorld = m_runtimePhysicsWorld;
    OnRuntimeStop();
    m_runtimeFixedDeltaTime = configuredFixedDeltaTime;

    if (!scene) {
        return;
    }

    m_runtimePhysicsWorld = configuredPhysicsWorld;
    m_runtimeScene = scene;
    m_runtimeRunning = true;
    m_runtime->OnRuntimeStart(scene);
    m_runtimeSceneCreatedSubscription = scene->OnGameObjectCreated().Subscribe(
        [this](Components::GameObject* gameObject) {
            HandleGameObjectCreated(gameObject);
        });

    for (Components::GameObject* root : scene->GetRootGameObjects()) {
        CollectScriptComponents(root);
    }

    const std::vector<ScriptInstanceKey> startupKeys = m_scriptOrder;
    for (const ScriptInstanceKey& key : startupKeys) {
        auto it = m_scriptStates.find(key);
        if (it == m_scriptStates.end()) {
            continue;
        }

        ScriptInstanceState& state = it->second;
        if (!ShouldScriptRun(state)) {
            continue;
        }

        EnsureScriptReady(state, true);
    }
}

void ScriptEngine::OnRuntimeStop() {
    if (m_runtimeScene && m_runtimeSceneCreatedSubscription != 0) {
        m_runtimeScene->OnGameObjectCreated().Unsubscribe(m_runtimeSceneCreatedSubscription);
        m_runtimeScene->OnGameObjectCreated().ProcessUnsubscribes();
        m_runtimeSceneCreatedSubscription = 0;
    }

    if (!m_runtimeRunning) {
        m_runtimeScene = nullptr;
        m_runtimePhysicsWorld = nullptr;
        m_scriptStates.clear();
        m_scriptOrder.clear();
        m_runtimeFixedDeltaTime = DefaultFixedDeltaTime;
        return;
    }

    std::vector<ScriptInstanceKey> keys = m_scriptOrder;
    for (const ScriptInstanceKey& key : keys) {
        auto it = m_scriptStates.find(key);
        if (it != m_scriptStates.end()) {
            StopTrackingScript(it->second, true);
        }
    }

    Components::Scene* stoppedScene = m_runtimeScene;
    m_scriptStates.clear();
    m_scriptOrder.clear();
    m_runtimeRunning = false;
    m_runtimeScene = nullptr;
    m_runtimePhysicsWorld = nullptr;
    m_runtimeFixedDeltaTime = DefaultFixedDeltaTime;
    m_runtime->OnRuntimeStop(stoppedScene);
}

void ScriptEngine::OnRuntimeSceneReplaced(Components::Scene* scene) {
    if (!m_runtimeRunning) {
        m_runtimeScene = nullptr;
        m_runtimePhysicsWorld = nullptr;
        m_runtimeSceneCreatedSubscription = 0;
        m_scriptStates.clear();
        m_scriptOrder.clear();
        return;
    }

    const float configuredFixedDeltaTime = m_runtimeFixedDeltaTime;
    m_runtime->OnRuntimeStop(nullptr);
    m_runtimeFixedDeltaTime = configuredFixedDeltaTime;

    m_runtimeScene = scene;
    m_runtimeSceneCreatedSubscription = 0;
    m_scriptStates.clear();
    m_scriptOrder.clear();

    if (!m_runtimeScene) {
        return;
    }

    m_runtime->OnRuntimeStart(m_runtimeScene);
    m_runtimeSceneCreatedSubscription = m_runtimeScene->OnGameObjectCreated().Subscribe(
        [this](Components::GameObject* gameObject) {
            HandleGameObjectCreated(gameObject);
        });

    for (Components::GameObject* root : m_runtimeScene->GetRootGameObjects()) {
        CollectScriptComponents(root);
    }

    const std::vector<ScriptInstanceKey> startupKeys = m_scriptOrder;
    for (const ScriptInstanceKey& key : startupKeys) {
        auto it = m_scriptStates.find(key);
        if (it == m_scriptStates.end()) {
            continue;
        }

        ScriptInstanceState& state = it->second;
        if (!ShouldScriptRun(state)) {
            continue;
        }

        EnsureScriptReady(state, true);
    }
}

void ScriptEngine::OnFixedUpdate(float fixedDeltaTime) {
    if (!m_runtimeRunning) {
        return;
    }

    const std::vector<ScriptInstanceKey> updateKeys = m_scriptOrder;
    for (const ScriptInstanceKey& key : updateKeys) {
        auto it = m_scriptStates.find(key);
        if (it == m_scriptStates.end()) {
            continue;
        }

        ScriptInstanceState& state = it->second;
        if (!ShouldScriptRun(state) || !EnsureScriptReady(state, true) || !state.enabled) {
            continue;
        }

        InvokeLifecycleMethod(state, ScriptLifecycleMethod::FixedUpdate, fixedDeltaTime);
    }
}

void ScriptEngine::OnUpdate(float deltaTime) {
    if (!m_runtimeRunning) {
        return;
    }

    const std::vector<ScriptInstanceKey> updateKeys = m_scriptOrder;
    for (const ScriptInstanceKey& key : updateKeys) {
        auto it = m_scriptStates.find(key);
        if (it == m_scriptStates.end()) {
            continue;
        }

        ScriptInstanceState& state = it->second;
        if (!ShouldScriptRun(state) || !EnsureScriptReady(state, true) || !state.enabled) {
            continue;
        }

        if (state.startPending && !state.startCalled) {
            InvokeLifecycleMethod(state, ScriptLifecycleMethod::Start);
            state.startCalled = true;
            state.startPending = false;
        }

        InvokeLifecycleMethod(state, ScriptLifecycleMethod::Update, deltaTime);
    }
}

void ScriptEngine::OnLateUpdate(float deltaTime) {
    if (!m_runtimeRunning) {
        return;
    }

    const std::vector<ScriptInstanceKey> updateKeys = m_scriptOrder;
    for (const ScriptInstanceKey& key : updateKeys) {
        auto it = m_scriptStates.find(key);
        if (it == m_scriptStates.end()) {
            continue;
        }

        ScriptInstanceState& state = it->second;
        if (!ShouldScriptRun(state) || !EnsureScriptReady(state, true) || !state.enabled) {
            continue;
        }

        InvokeLifecycleMethod(state, ScriptLifecycleMethod::LateUpdate, deltaTime);
    }
}

void ScriptEngine::DispatchPhysicsMessage(
    Components::GameObject* gameObject,
    ScriptPhysicsMessage message,
    Components::GameObject* other) {
    if (!m_runtimeRunning || !gameObject) {
        return;
    }

    for (ScriptComponent* component : gameObject->GetComponents<ScriptComponent>()) {
        if (!component) {
            continue;
        }

        ScriptInstanceState* state = FindState(component);
        if (!state || !ShouldScriptRun(*state) || !EnsureScriptReady(*state, true) || !state->enabled) {
            continue;
        }

        InvokePhysicsMessage(*state, message, other);
    }
}

void ScriptEngine::OnScriptComponentEnabled(ScriptComponent* component) {
    if (!m_runtimeRunning || !component) {
        return;
    }

    ScriptInstanceState* state = TrackScriptComponent(component);
    if (!state) {
        return;
    }

    if (ShouldScriptRun(*state)) {
        EnsureScriptReady(*state, true);
    }
}

void ScriptEngine::OnScriptComponentDisabled(ScriptComponent* component) {
    if (!m_runtimeRunning || !component) {
        return;
    }

    ScriptInstanceState* state = FindState(component);
    if (!state || !state->enabled) {
        return;
    }

    InvokeLifecycleMethod(*state, ScriptLifecycleMethod::OnDisable);
    state->enabled = false;
}

void ScriptEngine::OnScriptComponentDestroyed(ScriptComponent* component) {
    if (!m_runtimeRunning || !component) {
        return;
    }

    ScriptInstanceState* state = FindState(component);
    if (!state) {
        return;
    }

    StopTrackingScript(*state, false);
}

void ScriptEngine::OnScriptComponentClassChanged(ScriptComponent* component) {
    if (!component) {
        return;
    }

    if (!m_runtimeRunning) {
        return;
    }

    if (ScriptInstanceState* state = FindState(component)) {
        StopTrackingScript(*state, false);
    }

    if (!component->HasScriptClass()) {
        return;
    }

    ScriptInstanceState* state = TrackScriptComponent(component);
    if (!state) {
        return;
    }

    if (ShouldScriptRun(*state)) {
        EnsureScriptReady(*state, true);
    }
}

bool ScriptEngine::HasTrackedScriptComponent(const ScriptComponent* component) const {
    return FindState(component) != nullptr;
}

bool ScriptEngine::HasRuntimeInstance(const ScriptComponent* component) const {
    const ScriptInstanceState* state = FindState(component);
    return state && state->instanceCreated;
}

bool ScriptEngine::TryGetAvailableScriptClasses(
    std::vector<ScriptClassDescriptor>& outClasses,
    const std::string& assemblyName) const {
    outClasses.clear();

    std::vector<ScriptClassDescriptor> runtimeClasses;
    if (!m_runtime->TryGetAvailableScriptClasses(runtimeClasses)) {
        return false;
    }

    outClasses.reserve(runtimeClasses.size());
    for (const ScriptClassDescriptor& descriptor : runtimeClasses) {
        if (!assemblyName.empty() && descriptor.assemblyName != assemblyName) {
            continue;
        }

        if (descriptor.className.empty()) {
            continue;
        }

        outClasses.push_back(descriptor);
    }

    std::sort(
        outClasses.begin(),
        outClasses.end(),
        [](const ScriptClassDescriptor& lhs, const ScriptClassDescriptor& rhs) {
            if (lhs.assemblyName != rhs.assemblyName) {
                return lhs.assemblyName < rhs.assemblyName;
            }
            if (lhs.namespaceName != rhs.namespaceName) {
                return lhs.namespaceName < rhs.namespaceName;
            }
            return lhs.className < rhs.className;
        });

    return true;
}

bool ScriptEngine::TrySetScriptFieldValue(
    ScriptComponent* component,
    const std::string& fieldName,
    ScriptFieldType type,
    const ScriptFieldValue& value) {
    if (!component || fieldName.empty() || !IsScriptFieldValueCompatible(type, value)) {
        return false;
    }

    if (component->HasScriptClass()) {
        std::vector<ScriptFieldMetadata> fields;
        if (m_runtime->TryGetClassFieldMetadata(
                component->GetAssemblyName(),
                component->GetNamespaceName(),
                component->GetClassName(),
                fields)) {
            const auto fieldIt = std::find_if(
                fields.begin(),
                fields.end(),
                [&fieldName](const ScriptFieldMetadata& metadata) {
                    return metadata.name == fieldName;
                });
            if (fieldIt == fields.end() || fieldIt->type != type) {
                return false;
            }
        }
    }

    ScriptInstanceState* state = m_runtimeRunning ? FindState(component) : nullptr;
    if (state && state->instanceCreated && !m_runtime->TrySetManagedFieldValue(state->context, fieldName, value)) {
        return false;
    }

    return component->GetFieldStorage().SetFieldValue(fieldName, type, value);
}

bool ScriptEngine::TryGetScriptFieldValue(
    const ScriptComponent* component,
    const std::string& fieldName,
    ScriptFieldValue& outValue) const {
    if (!component || fieldName.empty()) {
        return false;
    }

    const ScriptInstanceState* state = m_runtimeRunning ? FindState(component) : nullptr;
    if (state && state->instanceCreated && m_runtime->TryGetManagedFieldValue(state->context, fieldName, outValue)) {
        return true;
    }

    const StoredScriptField* storedField = component->GetFieldStorage().FindField(fieldName);
    if (!storedField) {
        return false;
    }

    outValue = storedField->value;
    return true;
}

bool ScriptEngine::ApplyScriptFieldWrites(
    ScriptComponent* component,
    const std::vector<ScriptFieldWriteRequest>& requests,
    std::vector<ScriptFieldWriteResult>& outResults) {
    outResults.clear();
    if (!component) {
        return false;
    }

    ScriptFieldModel model;
    if (!TryGetScriptFieldModel(component, model)) {
        return false;
    }

    const std::unordered_map<std::string, ScriptFieldValue> defaultValues =
        CollectClassDefaultValues(m_runtime, component, model.classStatus);

    std::unordered_map<std::string, const ScriptFieldSnapshot*> fieldByName;
    fieldByName.reserve(model.fields.size());
    for (const ScriptFieldSnapshot& field : model.fields) {
        fieldByName.emplace(field.metadata.name, &field);
    }

    outResults.reserve(requests.size());

    bool allApplied = true;
    for (const ScriptFieldWriteRequest& request : requests) {
        ScriptFieldWriteResult result;
        result.fieldName = request.fieldName;
        result.type = request.type;

        if (request.fieldName.empty()) {
            result.status = ScriptFieldWriteStatus::EmptyFieldName;
            allApplied = false;
            outResults.push_back(std::move(result));
            continue;
        }

        if (!IsScriptFieldValueCompatible(request.type, request.value)) {
            result.status = ScriptFieldWriteStatus::InvalidValue;
            allApplied = false;
            outResults.push_back(std::move(result));
            continue;
        }

        const auto fieldIt = fieldByName.find(request.fieldName);
        if (fieldIt == fieldByName.end()) {
            result.status = ScriptFieldWriteStatus::UnknownField;
            allApplied = false;
            outResults.push_back(std::move(result));
            continue;
        }

        const ScriptFieldSnapshot& field = *fieldIt->second;
        if (field.metadata.type != request.type) {
            result.status = ScriptFieldWriteStatus::TypeMismatch;
            allApplied = false;
            outResults.push_back(std::move(result));
            continue;
        }

        if (model.classStatus == ScriptFieldClassStatus::Available && !field.declaredInClass) {
            result.status = ScriptFieldWriteStatus::StoredOnlyField;
            allApplied = false;
            outResults.push_back(std::move(result));
            continue;
        }

        const bool applied = field.declaredInClass
            ? TrySetScriptFieldValue(component, request.fieldName, request.type, request.value)
            : component->GetFieldStorage().SetFieldValue(request.fieldName, request.type, request.value);
        if (!applied) {
            result.status = ScriptFieldWriteStatus::ApplyFailed;
            allApplied = false;
            outResults.push_back(std::move(result));
            continue;
        }

        result.status = ScriptFieldWriteStatus::Applied;
        outResults.push_back(std::move(result));
    }

    return allApplied;
}

bool ScriptEngine::ClearScriptFieldOverrides(
    ScriptComponent* component,
    const std::vector<ScriptFieldClearRequest>& requests,
    std::vector<ScriptFieldClearResult>& outResults) {
    outResults.clear();
    if (!component) {
        return false;
    }

    ScriptFieldModel model;
    if (!TryGetScriptFieldModel(component, model)) {
        return false;
    }

    const std::unordered_map<std::string, ScriptFieldValue> defaultValues =
        CollectClassDefaultValues(m_runtime, component, model.classStatus);

    std::unordered_map<std::string, const ScriptFieldSnapshot*> fieldByName;
    fieldByName.reserve(model.fields.size());
    for (const ScriptFieldSnapshot& field : model.fields) {
        fieldByName.emplace(field.metadata.name, &field);
    }

    ScriptInstanceState* state = m_runtimeRunning ? FindState(component) : nullptr;
    const bool hasLiveInstance = state && state->instanceCreated;

    outResults.reserve(requests.size());

    bool allApplied = true;
    for (const ScriptFieldClearRequest& request : requests) {
        ScriptFieldClearResult result;
        result.fieldName = request.fieldName;

        if (request.fieldName.empty()) {
            result.status = ScriptFieldClearStatus::EmptyFieldName;
            allApplied = false;
            outResults.push_back(std::move(result));
            continue;
        }

        const auto fieldIt = fieldByName.find(request.fieldName);
        if (fieldIt == fieldByName.end()) {
            result.status = ScriptFieldClearStatus::UnknownField;
            allApplied = false;
            outResults.push_back(std::move(result));
            continue;
        }

        const ScriptFieldSnapshot& field = *fieldIt->second;

        bool resetManagedValue = false;
        if (field.declaredInClass && hasLiveInstance) {
            if (!m_runtime->TrySetManagedFieldValue(
                    state->context,
                    field.metadata.name,
                    ResolveScriptFieldDefaultValue(field.metadata, defaultValues))) {
                result.status = ScriptFieldClearStatus::ApplyFailed;
                allApplied = false;
                outResults.push_back(std::move(result));
                continue;
            }

            resetManagedValue = true;
        }

        bool removedStoredValue = false;
        if (field.hasStoredValue) {
            removedStoredValue = component->GetFieldStorage().Remove(field.metadata.name);
            if (!removedStoredValue) {
                result.status = ScriptFieldClearStatus::ApplyFailed;
                allApplied = false;
                outResults.push_back(std::move(result));
                continue;
            }
        }

        if (!removedStoredValue && !resetManagedValue) {
            result.status = ScriptFieldClearStatus::NoValueToClear;
            allApplied = false;
            outResults.push_back(std::move(result));
            continue;
        }

        result.status = ScriptFieldClearStatus::Applied;
        outResults.push_back(std::move(result));
    }

    return allApplied;
}

bool ScriptEngine::TryGetScriptFieldModel(
    const ScriptComponent* component,
    ScriptFieldModel& outModel) const {
    outModel = ScriptFieldModel{};
    if (!component) {
        return false;
    }

    std::vector<ScriptFieldMetadata> metadataFields;
    if (!component->HasScriptClass()) {
        outModel.classStatus = ScriptFieldClassStatus::Unassigned;
    } else if (m_runtime->TryGetClassFieldMetadata(
                   component->GetAssemblyName(),
                   component->GetNamespaceName(),
                   component->GetClassName(),
                   metadataFields)) {
        outModel.classStatus = ScriptFieldClassStatus::Available;
    } else {
        outModel.classStatus = ScriptFieldClassStatus::Missing;
    }

    const std::unordered_map<std::string, ScriptFieldValue> defaultValues =
        CollectClassDefaultValues(m_runtime, component, outModel.classStatus);

    const ScriptInstanceState* state = m_runtimeRunning ? FindState(component) : nullptr;
    std::unordered_map<std::string, size_t> fieldIndexByName;
    fieldIndexByName.reserve(metadataFields.size());

    for (const ScriptFieldMetadata& metadata : metadataFields) {
        ScriptFieldSnapshot snapshot;
        snapshot.metadata = metadata;
        snapshot.declaredInClass = true;
        snapshot.hasDefaultValue = true;
        snapshot.defaultValue = ResolveScriptFieldDefaultValue(metadata, defaultValues);
        snapshot.value = snapshot.defaultValue;
        snapshot.valueSource = ScriptFieldValueSource::DefaultValue;

        const StoredScriptField* storedField = component->GetFieldStorage().FindField(metadata.name);
        if (storedField) {
            snapshot.hasStoredValue = true;
            snapshot.storedType = storedField->type;
            snapshot.storedValue = storedField->value;
            if (storedField->type != metadata.type) {
                snapshot.issue = ScriptFieldIssue::TypeMismatch;
            }
        }

        if (state && state->instanceCreated && m_runtime->TryGetManagedFieldValue(state->context, metadata.name, snapshot.value)) {
            snapshot.hasValue = true;
            snapshot.valueSource = ScriptFieldValueSource::ManagedValue;
        } else if (storedField && storedField->type == metadata.type) {
            snapshot.hasValue = true;
            snapshot.value = storedField->value;
            snapshot.valueSource = ScriptFieldValueSource::StoredValue;
        }

        fieldIndexByName.emplace(metadata.name, outModel.fields.size());
        outModel.fields.push_back(std::move(snapshot));
    }

    for (const std::string& fieldName : component->GetFieldStorage().GetFieldNames()) {
        const StoredScriptField* storedField = component->GetFieldStorage().FindField(fieldName);
        if (!storedField) {
            continue;
        }

        const auto fieldIndexIt = fieldIndexByName.find(fieldName);
        if (fieldIndexIt != fieldIndexByName.end()) {
            continue;
        }

        ScriptFieldSnapshot snapshot;
        snapshot.metadata = ScriptFieldMetadata{fieldName, storedField->type};
        snapshot.hasValue = true;
        snapshot.value = storedField->value;
        snapshot.valueSource = ScriptFieldValueSource::StoredValue;
        snapshot.issue = ScriptFieldIssue::StoredOnly;
        snapshot.hasStoredValue = true;
        snapshot.storedType = storedField->type;
        snapshot.storedValue = storedField->value;
        outModel.fields.push_back(std::move(snapshot));
    }

    if (outModel.classStatus != ScriptFieldClassStatus::Available) {
        std::sort(
            outModel.fields.begin(),
            outModel.fields.end(),
            [](const ScriptFieldSnapshot& lhs, const ScriptFieldSnapshot& rhs) {
                return lhs.metadata.name < rhs.metadata.name;
            });
    }

    return true;
}

bool ScriptEngine::TryGetScriptFieldSnapshots(
    const ScriptComponent* component,
    std::vector<ScriptFieldSnapshot>& outFields) const {
    ScriptFieldModel model;
    if (!TryGetScriptFieldModel(component, model)) {
        outFields.clear();
        return false;
    }
    outFields = std::move(model.fields);
    return !outFields.empty();
}

size_t ScriptEngine::ScriptInstanceKeyHasher::operator()(const ScriptInstanceKey& key) const {
    const size_t h1 = std::hash<uint64_t>{}(key.gameObjectUUID);
    const size_t h2 = std::hash<uint64_t>{}(key.scriptComponentUUID);
    return h1 ^ (h2 + 0x9e3779b97f4a7c15ULL + (h1 << 6) + (h1 >> 2));
}

void ScriptEngine::CollectScriptComponents(Components::GameObject* gameObject) {
    if (!gameObject) {
        return;
    }

    for (ScriptComponent* component : gameObject->GetComponents<ScriptComponent>()) {
        TrackScriptComponent(component);
    }

    for (Components::GameObject* child : gameObject->GetChildren()) {
        CollectScriptComponents(child);
    }
}

void ScriptEngine::EnsureTrackedScriptsReady(Components::GameObject* gameObject) {
    if (!gameObject) {
        return;
    }

    for (ScriptComponent* component : gameObject->GetComponents<ScriptComponent>()) {
        ScriptInstanceState* state = FindState(component);
        if (!state || !ShouldScriptRun(*state)) {
            continue;
        }

        EnsureScriptReady(*state, true);
    }

    for (Components::GameObject* child : gameObject->GetChildren()) {
        EnsureTrackedScriptsReady(child);
    }
}

void ScriptEngine::HandleGameObjectCreated(Components::GameObject* gameObject) {
    if (!m_runtimeRunning || !gameObject || gameObject->GetScene() != m_runtimeScene) {
        return;
    }

    CollectScriptComponents(gameObject);
    EnsureTrackedScriptsReady(gameObject);
}

ScriptEngine::ScriptInstanceState* ScriptEngine::TrackScriptComponent(ScriptComponent* component) {
    if (!component || !component->GetGameObject()) {
        return nullptr;
    }

    const ScriptInstanceKey key{
        component->GetGameObject()->GetUUID(),
        component->GetScriptComponentUUID()
    };

    auto it = m_scriptStates.find(key);
    if (it != m_scriptStates.end()) {
        it->second.context.scene = component->GetScene();
        it->second.context.gameObject = component->GetGameObject();
        it->second.context.component = component;
        it->second.context.gameObjectUUID = component->GetGameObject()->GetUUID();
        it->second.context.scriptComponentUUID = component->GetScriptComponentUUID();
        return &it->second;
    }

    ScriptInstanceState state;
    state.context.scene = component->GetScene();
    state.context.gameObject = component->GetGameObject();
    state.context.component = component;
    state.context.gameObjectUUID = component->GetGameObject()->GetUUID();
    state.context.scriptComponentUUID = component->GetScriptComponentUUID();

    auto [insertedIt, inserted] = m_scriptStates.emplace(key, std::move(state));
    if (inserted) {
        m_scriptOrder.push_back(key);
    }

    return &insertedIt->second;
}

ScriptEngine::ScriptInstanceState* ScriptEngine::FindState(const ScriptComponent* component) {
    if (!component || !component->GetGameObject()) {
        return nullptr;
    }

    const ScriptInstanceKey key{
        component->GetGameObject()->GetUUID(),
        component->GetScriptComponentUUID()
    };

    auto it = m_scriptStates.find(key);
    return it != m_scriptStates.end() ? &it->second : nullptr;
}

const ScriptEngine::ScriptInstanceState* ScriptEngine::FindState(const ScriptComponent* component) const {
    if (!component || !component->GetGameObject()) {
        return nullptr;
    }

    const ScriptInstanceKey key{
        component->GetGameObject()->GetUUID(),
        component->GetScriptComponentUUID()
    };

    auto it = m_scriptStates.find(key);
    return it != m_scriptStates.end() ? &it->second : nullptr;
}

void ScriptEngine::RemoveTrackedScriptComponent(const ScriptComponent* component) {
    if (!component || !component->GetGameObject()) {
        return;
    }

    const ScriptInstanceKey key{
        component->GetGameObject()->GetUUID(),
        component->GetScriptComponentUUID()
    };

    m_scriptStates.erase(key);
    m_scriptOrder.erase(
        std::remove(m_scriptOrder.begin(), m_scriptOrder.end(), key),
        m_scriptOrder.end());
}

bool ScriptEngine::ShouldScriptRun(const ScriptInstanceState& state) const {
    return m_runtimeRunning
        && state.context.scene == m_runtimeScene
        && state.context.scene != nullptr
        && state.context.scene->IsActive()
        && state.context.gameObject != nullptr
        && state.context.gameObject->IsActiveInHierarchy()
        && state.context.component != nullptr
        && state.context.component->IsEnabled()
        && state.context.component->HasScriptClass();
}

bool ScriptEngine::EnsureScriptReady(ScriptInstanceState& state, bool invokeEnableIfNeeded) {
    if (!state.context.component || !state.context.gameObject || !state.context.scene || !state.context.component->HasScriptClass()) {
        return false;
    }

    if (!state.instanceCreated) {
        if (!m_runtime->CreateScriptInstance(state.context)) {
            return false;
        }
        state.instanceCreated = true;
    }

    if (!state.awakeCalled) {
        InvokeLifecycleMethod(state, ScriptLifecycleMethod::Awake);
        state.awakeCalled = true;
    }

    if (invokeEnableIfNeeded && !state.enabled && ShouldScriptRun(state)) {
        InvokeLifecycleMethod(state, ScriptLifecycleMethod::OnEnable);
        state.enabled = true;
        if (!state.startCalled) {
            state.startPending = true;
        }
    }

    return true;
}

void ScriptEngine::InvokeLifecycleMethod(ScriptInstanceState& state, ScriptLifecycleMethod method, float deltaTime) {
    m_runtime->InvokeMethod(state.context, method, deltaTime);
    m_runtime->SyncManagedFieldsToStorage(state.context);
}

void ScriptEngine::InvokePhysicsMessage(
    ScriptInstanceState& state,
    ScriptPhysicsMessage message,
    Components::GameObject* other) {
    m_runtime->InvokePhysicsMessage(state.context, message, other);
    m_runtime->SyncManagedFieldsToStorage(state.context);
}

void ScriptEngine::StopTrackingScript(ScriptInstanceState& state, bool runtimeStopping) {
    if (state.enabled) {
        InvokeLifecycleMethod(state, ScriptLifecycleMethod::OnDisable);
        state.enabled = false;
    }

    if (state.instanceCreated) {
        InvokeLifecycleMethod(state, ScriptLifecycleMethod::OnDestroy);
        m_runtime->DestroyScriptInstance(state.context);
        state.instanceCreated = false;
    }

    state.startPending = false;

    if (!runtimeStopping) {
        RemoveTrackedScriptComponent(state.context.component);
    }
}

} // namespace Scripting
} // namespace XCEngine