#include "EditorCorePrivate.hpp"

#include "App.hpp"
#include "AppConfig.hpp"
#include "EditorAccessories.hpp"
#include "EditorAttachmentImpl.hpp"
#include "EditorCommandPalette.hpp"
#include "EditorNotification.hpp"
#include "EditorUtils.hpp"
#include "GameObject.hpp"
#include "Macros.hpp"
#include "Mesh.hpp"
#include "Player.hpp"
#include "SceneThings.hpp"
#include "ScopeGuard.hpp"
#include "VertexIndex.hpp"
#include "YCombinator.hpp"

#define GLFW_INCLUDE_NONE
#include <GLFW/glfw3.h>

#include <imgui.h>
#include <misc/cpp/imgui_stdlib.h>
#include <cstddef>
#include <cstdint>
#include <cstdlib>
#include <functional>
#include <glm/gtc/quaternion.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <glm/gtx/quaternion.hpp>
#include <limits>
#include <memory>
#include <string>
#include <string_view>
#include <utility>

using namespace std::literals;

namespace ProjectBrussel_UNITY_ID {
// TODO handle internal state internally and move this to EditorUtils.hpp
enum RenamableSelectableAction {
	RSA_None,
	RSA_Selected,
	RSA_RenameCommitted,
	RSA_RenameCancelled,
};
RenamableSelectableAction RenamableSelectable(const char* displayName, bool selected, bool& renaming, std::string& renamingScratchBuffer) //
{
	RenamableSelectableAction result = RSA_None;

	ImGuiSelectableFlags flags = 0;
	// When renaming, disable all other entries that is not the one being renamed
	if (renaming && !selected) {
		flags |= ImGuiSelectableFlags_Disabled;
	}

	if (renaming && selected) {
		// State: being renamed

		ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, { 0, 0 });
		ImGui::PushStyleVar(ImGuiStyleVar_FrameBorderSize, 0);
		ImGui::SetKeyboardFocusHere();
		if (ImGui::InputText("##Rename", &renamingScratchBuffer, ImGuiInputTextFlags_AutoSelectAll | ImGuiInputTextFlags_EnterReturnsTrue)) {
			// Confirm
			renaming = false;
			result = RSA_RenameCommitted;
		}
		ImGui::PopStyleVar(2);

		if (ImGui::IsKeyPressed(ImGuiKey_Escape)) {
			// Cancel
			renaming = false;
			result = RSA_RenameCancelled;
		}
	} else {
		// State: normal

		if (ImGui::Selectable(displayName, selected, flags)) {
			result = RSA_Selected;
		}
	}

	return result;
}
} // namespace ProjectBrussel_UNITY_ID

void EditorInspector::SelectTarget(TargetType type, void* object) {
	selectedItt = type;
	selectedItPtr = object;
	renaming = false;
	renamingScratchBuffer.clear();
}

EditorContentBrowser::EditorContentBrowser(EditorInspector* inspector)
	: mInspector{ inspector } {
}

EditorContentBrowser::~EditorContentBrowser() {
}

void EditorContentBrowser::Show(bool* open) {
	using namespace ProjectBrussel_UNITY_ID;

	ImGuiWindowFlags windowFlags;
	if (mDocked) {
		// Center window horizontally, align bottom  vertically
		auto& viewportSize = ImGui::GetMainViewport()->Size;
		ImGui::SetNextWindowPos(ImVec2(viewportSize.x / 2, viewportSize.y), ImGuiCond_Always, ImVec2(0.5f, 1.0f));
		ImGui::SetNextWindowSizeRelScreen(0.8f, mBrowserHeight);
		windowFlags = ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoCollapse;
	} else {
		windowFlags = 0;
	}
	ImGui::Begin("Content Browser", open, windowFlags);

	ImGui::Splitter(true, kSplitterThickness, &mSplitterLeft, &mSplitterRight, kLeftPaneMinWidth, kRightPaneMinWidth);

	ImGui::BeginChild("LeftPane", ImVec2(mSplitterLeft - kPadding, 0.0f));
	{
		if (ImGui::Selectable("Settings", mPane == P_Settings)) {
			mPane = P_Settings;
		}
		if (ImGui::Selectable("Ires", mPane == P_Ires)) {
			mPane = P_Ires;
		}
		if (ImGui::Selectable("Levels", mPane == P_Level)) {
			mPane = P_Level;
		}
	}
	ImGui::EndChild();

	ImGui::SameLine(0.0f, kPadding + kSplitterThickness + kPadding);
	ImGui::BeginChild("RightPane"); // Fill remaining space
	auto origItt = mInspector->selectedItt;
	auto origItPtr = mInspector->selectedItPtr;
	switch (mPane) {
		case P_Settings: {
			ImGui::Checkbox("Docked", &mDocked);
			ImGui::SliderFloat("Height", &mBrowserHeight, 0.1f, 1.0f);
		} break;

		case P_Ires: {
			bool isIttIres = origItt == EditorInspector::ITT_Ires;

			if (ImGui::Button("New")) {
				ImGui::OpenPopup("New Ires");
			}
			if (ImGui::BeginPopup("New Ires")) {
				for (int i = 0; i < IresObject::KD_COUNT; ++i) {
					auto kind = static_cast<IresObject::Kind>(i);
					if (ImGui::MenuItem(IresObject::ToString(kind).data())) {
						auto ires = IresObject::Create(kind);
						auto [DISCARD, success] = IresManager::instance->Add(ires.get());
						if (success) {
							(void)ires.release();
						}
					}
				}
				ImGui::EndPopup();
			}

			ImGui::SameLine();
			if (ImGui::Button("Refresh list") ||
				ImGui::IsKeyPressed(ImGuiKey_F5))
			{
				// TODO
			}

			ImGui::SameLine();
			if (ImGui::Button("Save", !isIttIres)) {
				auto ires = static_cast<IresObject*>(origItPtr);
				IresManager::instance->Save(ires);
			}

			ImGui::SameLine();
			if (ImGui::Button("Reload", !isIttIres)) {
				auto ires = static_cast<IresObject*>(origItPtr);
				IresManager::instance->Reload(ires);
			}

			ImGui::SameLine();
			if (ImGui::Button("Rename", !isIttIres) ||
				(isIttIres && ImGui::IsKeyPressed(ImGuiKey_F2, false)))
			{
				auto ires = static_cast<IresObject*>(origItPtr);
				mInspector->renaming = true;
				mInspector->renamingScratchBuffer = ires->GetName();
			}

			ImGui::SameLine();
			if (ImGui::Button("Delete", !isIttIres) ||
				(isIttIres && ImGui::IsKeyPressed(ImGuiKey_Delete, false)))
			{
				ImGui::OpenPopup("Delete Ires");
			}
			bool openedDummy = true;
			if (ImGui::BeginPopupModal("Delete Ires", &openedDummy, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoResize)) {
				if (ImGui::Button("Confirm")) {
					auto ires = static_cast<IresObject*>(origItPtr);
					IresManager::instance->Delete(ires);
				}
				ImGui::SameLine();
				if (ImGui::Button("Cancel")) {
					ImGui::CloseCurrentPopup();
				}
				ImGui::EndPopup();
			}

			auto& objects = IresManager::instance->GetObjects();
			for (auto it = objects.begin(); it != objects.end(); ++it) {
				auto ires = it->second.Get();
				auto& name = ires->GetName();

				bool selected = origItPtr == ires;

				switch (RenamableSelectable(name.c_str(), selected, mInspector->renaming, mInspector->renamingScratchBuffer)) {
					case RSA_Selected: {
						mInspector->SelectTarget(EditorInspector::ITT_Ires, ires);
					} break;

					case RSA_RenameCommitted: {
						ires->SetName(std::move(mInspector->renamingScratchBuffer));
					} break;

					// Do nothing
					case RSA_RenameCancelled:
					case RSA_None: break;
				}
				if (!mInspector->renaming) {
					if (ImGui::BeginDragDropSource()) {
						auto kindName = IresObject::ToString(ires->GetKind());
						// Reason: intentionally using pointer as payload
						ImGui::SetDragDropPayload(kindName.data(), &ires, sizeof(ires)); // NOLINT(bugprone-sizeof-expression)
						ImGui::Text("%s '%s'", kindName.data(), name.c_str());
						ImGui::EndDragDropSource();
					}
				}
			}
		} break;

		case P_Level: {
			bool isIttLevel = origItt == EditorInspector::ITT_Level;

			if (ImGui::Button("New")) {
				auto uid = Uid::Create();
				auto& ldObj = LevelManager::instance->AddLevel(uid);
				mInspector->SelectTarget(EditorInspector::ITT_Level, &ldObj);
				mInspector->renaming = true;
				mInspector->renamingScratchBuffer = ldObj.name;
			}

			auto& objects = LevelManager::instance->mObjByUid;
			for (auto it = objects.begin(); it != objects.end(); ++it) {
				auto& uid = it->first;
				auto& ldObj = it->second;
				auto* level = ldObj.level.Get();
				bool selected = origItPtr == &ldObj;
				const char* displayName = ldObj.name.c_str();
				if (strcmp(displayName, "") == 0) {
					displayName = "<unnamed level>";
				}

				switch (RenamableSelectable(displayName, selected, mInspector->renaming, mInspector->renamingScratchBuffer)) {
					case RSA_Selected: {
						mInspector->SelectTarget(EditorInspector::ITT_Level, &ldObj);
					} break;

					case RSA_RenameCommitted: {
						ldObj.name = std::move(mInspector->renamingScratchBuffer);
					} break;

					// Do nothing
					case RSA_RenameCancelled:
					case RSA_None: break;
				}
				if (!mInspector->renaming) {
					if (ImGui::BeginDragDropSource()) {
						// Reason: intentionally using pointer as payload
						ImGui::SetDragDropPayload(BRUSSEL_TAG_Level, &ldObj, sizeof(ldObj)); // NOLINT(bugprone-sizeof-expression)
						ImGui::Text(BRUSSEL_Uid_FORMAT_STR, BRUSSEL_Uid_FORMAT_EXPAND(uid));
						ImGui::TextUnformatted(ldObj.name.c_str());
						ImGui::EndDragDropSource();
					}
				}
			}
		} break;
	}
	ImGui::EndChild();

	ImGui::End();
}

namespace ProjectBrussel_UNITY_ID {
glm::quat CalcQuaternionFromDegreesEulerAngle(glm::vec3 eulerAngleDegrees) {
	glm::vec3 eulerAngleRadians;
	eulerAngleRadians.x = eulerAngleDegrees.x / 180 * M_PI;
	eulerAngleRadians.y = eulerAngleDegrees.y / 180 * M_PI;
	eulerAngleRadians.z = eulerAngleDegrees.z / 180 * M_PI;
	return glm::quat(eulerAngleRadians);
}

void PushKeyCodeRecorder(App* app, int* writeKey, bool* writeKeyStatus) {
	app->PushKeyCaptureCallback([=](int key, int action) {
		// Allow the user to cancel by pressing Esc
		if (key == GLFW_KEY_ESCAPE) {
			return true;
		}

		if (action == GLFW_PRESS) {
			*writeKey = key;
			*writeKeyStatus = writeKeyStatus;
			return true;
		}
		return false;
	});
}

struct GobjTreeNodeShowInfo {
	EditorInstance* in_editor;
	GameObject* out_openPopup = nullptr;
};

void GobjTreeNode(GobjTreeNodeShowInfo& showInfo, GameObject* object) {
	auto& inspector = showInfo.in_editor->GetInspector();

	auto attachment = object->GetEditorAttachment();
	if (!attachment) {
		attachment = EaGameObject::Create(object).release();
		object->SetEditorAttachment(attachment); // NOTE: takes ownership
	}

	ImGuiTreeNodeFlags flags =
		ImGuiTreeNodeFlags_DefaultOpen |
		ImGuiTreeNodeFlags_OpenOnDoubleClick |
		ImGuiTreeNodeFlags_OpenOnArrow |
		ImGuiTreeNodeFlags_SpanAvailWidth |
		ImGuiTreeNodeFlags_NoTreePushOnOpen;
	if (inspector.selectedItPtr == object) {
		flags |= ImGuiTreeNodeFlags_Selected;
	}

	ImGui::PushID(reinterpret_cast<uintptr_t>(object));
	// BEGIN tree node

	bool opened = ImGui::TreeNodeEx(attachment->name.c_str(), flags);
	if (ImGui::IsItemClicked(ImGuiMouseButton_Left)) {
		inspector.SelectTarget(EditorInspector::ITT_GameObject, object);
	}
	if (ImGui::IsMouseReleased(ImGuiMouseButton_Right) &&
		ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByPopup))
	{
		showInfo.out_openPopup = object;
	}

	if (opened) {
		ImGui::Indent();
		for (auto& child : object->GetChildren()) {
			GobjTreeNode(showInfo, child);
		}
		ImGui::Unindent();
	}

	// END tree node
	ImGui::PopID();
};

#define GAMEOBJECT_CONSTRUCTOR(ClassName) [](GameWorld* world) -> GameObject* { return new ClassName(world); }
struct CreatableGameObject {
	GameObject* (*factory)(GameWorld*);
	const char* name;
	GameObject::Kind kind;
} creatableGameObjects[] = {
	{
		.factory = GAMEOBJECT_CONSTRUCTOR(GameObject),
		.name = "GameObject",
		.kind = GameObject::KD_Generic,
	},
	{
		.factory = GAMEOBJECT_CONSTRUCTOR(SimpleGeometryObject),
		.name = "Simple Geometry",
		.kind = GameObject::KD_SimpleGeometry,
	},
	{
		.factory = GAMEOBJECT_CONSTRUCTOR(BuildingObject),
		.name = "Building",
		.kind = GameObject::KD_Building,
	},
	{
		.factory = GAMEOBJECT_CONSTRUCTOR(LevelWrapperObject),
		.name = "Level Wrapper",
		.kind = GameObject::KD_LevelWrapper,
	},
};
#undef GAMEOBJECT_CONSTRUCTOR
} // namespace ProjectBrussel_UNITY_ID

std::unique_ptr<IEditor> IEditor::CreateInstance(App* app) {
	return std::make_unique<EditorInstance>(app);
}

EditorInstance::EditorInstance(App* app)
	: mApp{ app }
	, mEdContentBrowser(&mEdInspector) {
	mEditorCamera.name = "Editor Camera"s;
	mEditorCamera.SetEyePos(glm::vec3(0, 0, 1));
	mEditorCamera.SetTargetDirection(glm::vec3(0, 0, -1));
	app->BindActiveCamera(&mEditorCamera);
}

EditorInstance::~EditorInstance() {
}

void EditorInstance::OnGameStateChanged(bool running) {
	if (running) {
		mApp->UnbindActiveCamera();
	} else {
		mApp->BindActiveCamera(&mEditorCamera);
	}
}

void EditorInstance::Show() {
	using namespace ProjectBrussel_UNITY_ID;
	using namespace Tags;

	auto world = mApp->GetWorld();
	auto& io = ImGui::GetIO();

	ImGui::BeginMainMenuBar();
	if (ImGui::BeginMenu("View")) {
		ImGui::MenuItem("ImGui Demo", nullptr, &mWindowVisible_ImGuiDemo);
		ImGui::MenuItem("Command Palette", "Ctrl+Shift+P", &mWindowVisible_CommandPalette);
		ImGui::MenuItem("Inspector", nullptr, &mWindowVisible_Inspector);
		ImGui::MenuItem("Content Browser", "Ctrl+Space", &mWindowVisible_ContentBrowser);
		ImGui::MenuItem("World Structure", nullptr, &mWindowVisible_WorldStructure);
		ImGui::MenuItem("World Properties", nullptr, &mWindowVisible_WorldProperties);
		ImGui::EndMenu();
	}
	ImGui::EndMainMenuBar();

	if (mWindowVisible_ImGuiDemo) {
		ImGui::ShowDemoWindow(&mWindowVisible_ImGuiDemo);
	}

	if (io.KeyCtrl && io.KeyShift && ImGui::IsKeyPressed(GLFW_KEY_P, false)) {
		mWindowVisible_CommandPalette = !mWindowVisible_CommandPalette;
	}
	if (mWindowVisible_CommandPalette) {
		mEdCommandPalette.Show(&mWindowVisible_CommandPalette);
	}

	if (io.KeyCtrl && ImGui::IsKeyPressed(GLFW_KEY_SPACE, false)) {
		mWindowVisible_ContentBrowser = !mWindowVisible_ContentBrowser;
	}
	if (mWindowVisible_ContentBrowser) {
		mEdContentBrowser.Show(&mWindowVisible_ContentBrowser);
	}

	auto& camera = *mApp->GetActiveCamera();
	ImGuizmo::SetRect(0, 0, io.DisplaySize.x, io.DisplaySize.y);
	ImGuizmo::SetDrawlist(ImGui::GetBackgroundDrawList());

	if (IsCurrentCameraEditor() && mEcm == ECM_Side3D) {
		float viewManipulateRight = io.DisplaySize.x;
		float viewManipulateTop = 0;

		// TODO get rid of this massive hack: how to manage const better for intuitively read-only, but write doesn't-care data?
		auto& lastFrameInfo = const_cast<RendererFrameInfo&>(mApp->GetWorldRenderer()->GetLastFrameInfo());
		auto& view = lastFrameInfo.matrixView;
		auto& proj = lastFrameInfo.matrixProj;

#if 0
		ImGuizmo::ViewManipulate(
			glm::value_ptr(view),
			200.0f, // TODO
			ImVec2(viewManipulateRight - 128, viewManipulateTop),
			ImVec2(128, 128),
			0x10101010);
		// Extract eye and target position from view matrix
		// - View matrix transforms world space to view space
		// - Inverse view matrix should transform view space into world space
		// - In view space, camera's pos is (0,0,0) and the look/forward vector should be (0,0,-1)
		auto invView = glm::inverse(view);
		camera.eye = invView * glm::vec4(0, 0, 0, 1);
		camera.target = camera.eye + glm::vec3(invView * glm::vec4(0, 0, -1, 1));
#endif

		// TODO draw this as a part of the world so it doesn't block objects
#if 0
		glm::mat4 identity(1.00f);
		ImGuizmo::DrawGrid(
			glm::value_ptr(view),
			glm::value_ptr(proj),
			glm::value_ptr(identity),
			100.f);
#endif

		{ // Camera controls
			auto cameraPos = camera.eye;
			auto cameraForward = glm::normalize(camera.target - camera.eye);
			// Always move on the horzontal flat plane
			cameraForward.y = 0.0f;

			if (mMoveCamKeyboard) {
				if (ImGui::IsKeyDown(ImGuiKey_W)) {
					cameraPos += mMoveCamSlideSpeed * cameraForward;
				}
				if (ImGui::IsKeyDown(ImGuiKey_S)) {
					auto cameraBack = glm::normalize(-cameraForward);
					cameraPos += mMoveCamSlideSpeed * cameraBack;
				}
				if (ImGui::IsKeyDown(ImGuiKey_A)) {
					auto cameraRight = glm::normalize(glm::cross(cameraForward, glm::vec3(0, 1, 0)));
					auto cameraLeft = -cameraRight;
					cameraPos += mMoveCamSlideSpeed * cameraLeft;
				}
				if (ImGui::IsKeyDown(ImGuiKey_D)) {
					auto cameraRight = glm::normalize(glm::cross(cameraForward, glm::vec3(0, 1, 0)));
					cameraPos += mMoveCamSlideSpeed * cameraRight;
				}
				if (ImGui::IsKeyDown(ImGuiKey_Space)) {
					cameraPos.y += mMoveCamSlideSpeed;
				}
				if (ImGui::IsKeyDown(ImGuiKey_LeftShift)) {
					cameraPos.y -= mMoveCamSlideSpeed;
				}
			}

			if (mMoveCamScrollWheel) {
				cameraPos += cameraForward * io.MouseWheel * mMoveCamScrollSpeed;
			}

			camera.SetEyePos(cameraPos);
		}
	} else {
		{ // Camera controls
			auto cameraPos = camera.eye;

			if (ImGui::IsMouseClicked(ImGuiMouseButton_Right) && !io.WantCaptureMouse && !mDragCam_Happening) {
				mDragCam_CamInitial = camera.eye;
				mDragCam_CursorInitial = ImGui::GetMousePos();
				mDragCam_Happening = true;
			}
			if (mDragCam_Happening) {
				auto newPos = ImGui::GetMousePos();
				// NOTE: we are emulating as if the mouse is dragging the "canvas", through moving the camera in the opposite direction of the natural position delta
				float deltaX = mDragCam_CursorInitial.x - newPos.x;
				cameraPos.x = mDragCam_CamInitial.x + deltaX / camera.pixelsPerMeter;
				float deltaY = -(mDragCam_CursorInitial.y - newPos.y); // Invert Y delta because ImGui uses top-left origin (mouse moving down translates to positive value, but in our coordinate system down is negative)
				cameraPos.y = mDragCam_CamInitial.y + deltaY / camera.pixelsPerMeter;
			}
			if (ImGui::IsMouseReleased(ImGuiMouseButton_Right)) {
				mDragCam_Happening = false;
			}

			if (mMoveCamKeyboard) {
				if (ImGui::IsKeyDown(ImGuiKey_W)) {
					cameraPos.y += mMoveCamSlideSpeed;
				}
				if (ImGui::IsKeyDown(ImGuiKey_S)) {
					cameraPos.y -= mMoveCamSlideSpeed;
				}
				if (ImGui::IsKeyDown(ImGuiKey_A)) {
					cameraPos.x -= mMoveCamSlideSpeed;
				}
				if (ImGui::IsKeyDown(ImGuiKey_D)) {
					cameraPos.x += mMoveCamSlideSpeed;
				}
			}

			if (mMoveCamScrollWheel) {
				cameraPos.z = std::clamp(cameraPos.z + io.MouseWheel, 0.1f, 100.0f);
			}

			camera.SetEyePos(cameraPos);
		}
	}

	if (mWindowVisible_Inspector) {
		ImGui::Begin("Inspector");
		switch (mEdInspector.selectedItt) {
			case EditorInspector::ITT_GameObject: {
				auto object = static_cast<GameObject*>(mEdInspector.selectedItPtr);
				ShowInspector(object);
			} break;

			case EditorInspector::ITT_Ires: {
				auto ires = static_cast<IresObject*>(mEdInspector.selectedItPtr);
				ShowInspector(ires);
			} break;

			case EditorInspector::ITT_Level: {
				auto ldObj = static_cast<LevelManager::LoadableObject*>(mEdInspector.selectedItPtr);
				ShowInspector(ldObj);
			} break;

			case EditorInspector::ITT_None: break;
		}
		ImGui::End();
	}

	if (mWindowVisible_WorldProperties) {
		ImGui::Begin("World properties");
		ShowWorldProperties();
		ImGui::End();
	}

	if (mWindowVisible_WorldStructure) {
		ImGui::Begin("World structure");
		GobjTreeNodeShowInfo showInfo{
			.in_editor = this,
		};
		GobjTreeNode(showInfo, &world->GetRoot());

		if (showInfo.out_openPopup) {
			mPopupCurrent_GameObject = showInfo.out_openPopup;

			ImGui::OpenPopup("GameObject Popup");
			ImGui::SetNextWindowPos(ImGui::GetMousePos());
		}
		if (ImGui::BeginPopup("GameObject Popup")) {
			// Target no longer selected during popup open
			if (!mPopupCurrent_GameObject) {
				ImGui::CloseCurrentPopup();
			}

			if (ImGui::BeginMenu("Add child")) {
				for (size_t i = 0; i < std::size(creatableGameObjects); ++i) {
					auto& info = creatableGameObjects[i];
					if (ImGui::MenuItem(info.name)) {
						auto object = info.factory(world);
						mPopupCurrent_GameObject->AddChild(object);
					}
				}
				ImGui::EndMenu();
			}
			ImGui::Separator();
			if (ImGui::MenuItem("Remove")) {
				ImGui::DialogConfirmation("Are you sure you want to delete this GameObject?", [object = mPopupCurrent_GameObject](bool yes) {
					object->RemoveSelfFromParent();
					delete object;
				});
			}
			ImGui::EndPopup();
		}
		ImGui::End();
	}

	ShowSpriteViewer();

	ImGui::ShowDialogs();
	ImGui::ShowNotifications();
}

void EditorInstance::ShowWorldProperties() {
	if (mApp->IsGameRunning()) {
		if (ImGui::Button("Pause")) {
			mApp->SetGameRunning(false);
		}
		if (ImGui::IsItemHovered()) {
			ImGui::SetTooltip("The game is currently running. Click to pause.");
		}
	} else {
		if (ImGui::Button("Play")) {
			mApp->SetGameRunning(true);
		}
		if (ImGui::IsItemHovered()) {
			ImGui::SetTooltip("The game is currently paused. Click to run.");
		}
	}

	auto& camera = *mApp->GetActiveCamera();

	// vvv Camera settings (per instance)
	ImGui::TextUnformatted("Active camera:");
	ImGui::Indent();

	ImGui::TextUnformatted(camera.name.c_str());
	if (ImGui::IsItemHovered()) {
		ImGui::SetTooltip("Object at <%p>", &camera);
	}

	ImGui::InputFloat3("Eye", glm::value_ptr(camera.eye));
	if (ImGui::IsMouseReleased(ImGuiMouseButton_Right) && ImGui::IsItemHovered()) {
		ImGui::OpenPopup("##CTXMENU");
	}
	ImGui::InputFloat3("Target", glm::value_ptr(camera.target));
	if (ImGui::IsMouseReleased(ImGuiMouseButton_Right) && ImGui::IsItemHovered()) {
		ImGui::OpenPopup("##CTXMENU");
	}
	if (ImGui::BeginPopup("##CTXMENU", ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoSavedSettings)) {
		if (ImGui::MenuItem("Reset to origin")) {
			camera.SetEyePos(glm::vec3(1.0f, 1.0f, 1.0f));
		}
		if (ImGui::MenuItem("Reset completely")) {
			camera.eye = glm::vec3(0, 0, 1);
			camera.target = glm::vec3(0, 0, 0);
		}
		ImGui::EndPopup();
	}

	if (IsCurrentCameraEditor()) {
		const char* preview;
		switch (mEcm) {
			case ECM_2D: preview = "2D view"; break;
			case ECM_Side3D: preview = "Side 3D view"; break;
		}
		if (ImGui::BeginCombo("Mode", preview)) {
			if (ImGui::Selectable("2D view", mEcm == ECM_2D)) {
				if (mEcm != ECM_2D) {
					mEcm = ECM_2D;

					// TODO project eye to world plane

					camera.SetHasPerspective(false);
				}
			}
			if (ImGui::Selectable("Side 3D view", mEcm == ECM_Side3D, ImGuiSelectableFlags_None)) {
				if (mEcm != ECM_Side3D) {
					mEcm = ECM_Side3D;

					auto origEye = camera.eye;
					auto origTarget = camera.target;

					// New setup: focus on the point of world plane that we were originally "hovering above"
					camera.target = origEye;
					camera.target.z = 0.0f;

					// New setup: move the eye back at an angle
					camera.eye = camera.target;
					camera.eye.x += 4.0f * std::cos(60.0f);
					camera.eye.y += 0.0f;
					camera.eye.z += 4.0f * std::sin(60.0f);

					camera.SetHasPerspective(true);
				}
			}
			ImGui::EndCombo();
		}
	}

	ImGui::Checkbox("Perspective", &camera.perspective);
	if (camera.perspective) {
		float fovDegress = camera.fov / M_PI * 180.0f;
		if (ImGui::SliderFloat("FOV", &fovDegress, 1.0f, 180.0f)) {
			camera.fov = fovDegress / 180.0f * M_PI;
		}
	} else {
		if (ImGui::InputFloat("Pixels per meter", &camera.pixelsPerMeter)) {
			camera.pixelsPerMeter = std::max(camera.pixelsPerMeter, 0.0f);
		}
	}

	ImGui::Unindent();
	// ^^^ Camera settings (per instance)
	// vvv Camera control settings
	ImGui::TextUnformatted("Camera controls:");
	ImGui::Indent();

	ImGui::Checkbox("Move camera with WASD", &mMoveCamKeyboard);
	ImGui::SliderFloat("Slide speed", &mMoveCamSlideSpeed, 0.1f, 10.0f);

	ImGui::Checkbox("Move camera with scoll wheel", &mMoveCamScrollWheel);
	ImGui::SliderFloat("Scroll speed", &mMoveCamScrollSpeed, 0.01, 10.0f);

	ImGui::Unindent();
	// ^^^ Camera control settings
}

// TOOD move resource-specific and gameobject-specific inspector code into attachments mechanism

void EditorInstance::ShowInspector(IresObject* ires) {
	ires->ShowEditor(*this);
}

void EditorInstance::ShowInspector(LevelManager::LoadableObject* ldObj) {
	using namespace Tags;
	using namespace ProjectBrussel_UNITY_ID;

	ImGui::InputText("Name", &ldObj->name);
	ImGui::InputTextMultiline("Desciption", &ldObj->description);

	// TODO level object explorer
}

void EditorInstance::ShowInspector(GameObject* object) {
	using namespace Tags;
	using namespace ProjectBrussel_UNITY_ID;

	auto& io = ImGui::GetIO();

	auto objectEa = static_cast<EaGameObject*>(object->GetEditorAttachment());

	auto ShowInspector = [&](/*array[6]*/ float* bounds = nullptr) {
		glm::mat4 identityMatrix(1.00f);

		if (io.KeyAlt && ImGui::IsKeyPressed(ImGuiKey_T))
			mGuizmo.currOperation = ImGuizmo::TRANSLATE;
		if (io.KeyAlt && ImGui::IsKeyPressed(ImGuiKey_R))
			mGuizmo.currOperation = ImGuizmo::ROTATE;
		if (io.KeyAlt && ImGui::IsKeyPressed(ImGuiKey_S))
			mGuizmo.currOperation = ImGuizmo::SCALE;
		if (ImGui::RadioButton("Translate", mGuizmo.currOperation == ImGuizmo::TRANSLATE))
			mGuizmo.currOperation = ImGuizmo::TRANSLATE;
		ImGui::SameLine();
		if (ImGui::RadioButton("Rotate", mGuizmo.currOperation == ImGuizmo::ROTATE))
			mGuizmo.currOperation = ImGuizmo::ROTATE;
		ImGui::SameLine();
		if (ImGui::RadioButton("Scale", mGuizmo.currOperation == ImGuizmo::SCALE))
			mGuizmo.currOperation = ImGuizmo::SCALE;
		ImGui::SameLine();
		if (ImGui::RadioButton("Universal", mGuizmo.currOperation == ImGuizmo::UNIVERSAL))
			mGuizmo.currOperation = ImGuizmo::UNIVERSAL;

		if (mGuizmo.currOperation != ImGuizmo::SCALE) {
			if (ImGui::RadioButton("Local", mGuizmo.currMode == ImGuizmo::LOCAL))
				mGuizmo.currMode = ImGuizmo::LOCAL;
			ImGui::SameLine();
			if (ImGui::RadioButton("World", mGuizmo.currMode == ImGuizmo::WORLD))
				mGuizmo.currMode = ImGuizmo::WORLD;
		}

		ImGui::Checkbox("##UseSnap", &mGuizmo.useSnap);
		ImGui::SameLine();
		switch (mGuizmo.currOperation) {
			case ImGuizmo::TRANSLATE:
				ImGui::InputFloat3("Pos Snap", &mGuizmo.snap[0]);
				break;
			case ImGuizmo::ROTATE:
				ImGui::InputFloat("Angle Snap", &mGuizmo.snap[0]);
				break;
			case ImGuizmo::SCALE:
				ImGui::InputFloat("Scale Snap", &mGuizmo.snap[0]);
				break;
			default: break;
		}

		if (bounds) {
			ImGui::Checkbox("Bound Sizing", &mGuizmo.boundSizing);
			if (mGuizmo.boundSizing) {
				ImGui::PushID(3);
				ImGui::Checkbox("##BoundSizing", &mGuizmo.boundSizingSnap);
				ImGui::SameLine();
				ImGui::InputFloat3("Bound Snap", mGuizmo.boundsSnap);
				ImGui::PopID();
			}
		}

		ImGui::Separator();

		auto objectPos = object->GetPos();
		if (ImGui::InputFloat3("Translation", &objectPos.x)) {
			object->SetPos(objectPos);
		}

		auto objectRot = object->GetRotation();
		if (ImGui::InputFloat3("Rotation", &objectEa->eulerAnglesRotation.x)) {
			objectRot = CalcQuaternionFromDegreesEulerAngle(objectEa->eulerAnglesRotation);
			object->SetRotation(objectRot);
		}

		auto objectScale = object->GetScale();
		if (ImGui::InputFloat3("Scale", &objectScale.x)) {
			object->SetScale(objectScale);
		}
	};

	auto ShowGuizmo = [&](/*array[6]*/ float* bounds = nullptr) {
		glm::mat4 identityMatrix(1.00f);

		auto& lastFrameInfo = mApp->GetWorldRenderer()->GetLastFrameInfo();
		auto& cameraViewMat = lastFrameInfo.matrixView;
		const float* cameraView = &cameraViewMat[0][0];
		auto& cameraProjMat = lastFrameInfo.matrixProj;
		const float* cameraProj = &cameraProjMat[0][0];

		auto objectPos = object->GetPos();
		auto objectScale = object->GetScale();

		float matrix[16];
		ImGuizmo::RecomposeMatrixFromComponents(&objectPos.x, &objectEa->eulerAnglesRotation.x, &objectScale.x, matrix);

		bool edited = ImGuizmo::Manipulate(
			cameraView,
			cameraProj,
			mGuizmo.currOperation,
			mGuizmo.currMode,
			matrix,
			nullptr,
			mGuizmo.useSnap ? mGuizmo.snap : nullptr,
			mGuizmo.boundSizing ? bounds : nullptr,
			(bounds && mGuizmo.boundSizingSnap) ? mGuizmo.boundsSnap : nullptr);

		if (edited) {
			ImGuizmo::DecomposeMatrixToComponents(matrix, &objectPos.x, &objectEa->eulerAnglesRotation.x, &objectScale.x);
			object->SetPos(objectPos);
			object->SetRotation(CalcQuaternionFromDegreesEulerAngle(objectEa->eulerAnglesRotation));
			object->SetScale(objectScale);
		}
	};

	auto type = object->GetKind();
	switch (type) {
		case GameObject::KD_Player: {
			ShowInspector();
			ShowGuizmo();
			ImGui::Separator();

			auto player = static_cast<Player*>(object);
			auto ea = static_cast<EaPlayer*>(objectEa);
			auto& kb = player->keybinds;

			ImGui::Text("Player #%d", player->GetId());

			ImGui::TextUnformatted("Spritesheet: ");
			ImGui::SameLine();
			IresObject::ShowReferenceSafe(*this, ea->confSprite.Get());
			if (ImGui::BeginDragDropTarget()) {
				if (auto payload = ImGui::AcceptDragDropPayload(IresObject::ToString(IresObject::KD_Spritesheet).data())) {
					auto spritesheet = *static_cast<IresSpritesheet* const*>(payload->Data);
					ea->confSprite.Attach(spritesheet);
					auto def = spritesheet->GetInstance();
					player->sprite.SetDefinition(def);
					player->renderObject.autofill_TextureAtlas.Attach(def->GetAtlas());
				}
				ImGui::EndDragDropTarget();
			}

			ImGui::TextUnformatted("Material: ");
			ImGui::SameLine();
			IresObject::ShowReferenceSafe(*this, ea->confMaterial.Get());
			if (ImGui::BeginDragDropTarget()) {
				if (auto payload = ImGui::AcceptDragDropPayload(IresObject::ToString(IresObject::KD_Material).data())) {
					auto material = *static_cast<IresMaterial* const*>(payload->Data);
					ea->confMaterial.Attach(material);
					player->SetMaterial(material->GetInstance());
				}
				ImGui::EndDragDropTarget();
			}

			if (ImGui::Button("Load config")) {
				bool success = player->LoadFromFile();
				if (success) {
					ImGui::AddNotification(ImGuiToast(ImGuiToastType_Success, "Successfully loaded player config"));
				}
			}
			ImGui::SameLine();
			if (ImGui::Button("Save config")) {
				bool success = player->SaveToFile();
				if (success) {
					ImGui::AddNotification(ImGuiToast(ImGuiToastType_Success, "Successfully saved player config"));
				}
			}

			ImGui::Text("Move left (%s)", ImGui::GetKeyNameGlfw(kb.keyLeft));
			ImGui::SameLine();
			if (ImGui::Button("Change##Move left")) {
				PushKeyCodeRecorder(mApp, &kb.keyLeft, &kb.pressedLeft);
			}

			ImGui::Text("Move right (%s)", ImGui::GetKeyNameGlfw(kb.keyRight));
			ImGui::SameLine();
			if (ImGui::Button("Change##Move right")) {
				PushKeyCodeRecorder(mApp, &kb.keyRight, &kb.pressedRight);
			}

			ImGui::Text("Jump (%s)", ImGui::GetKeyNameGlfw(kb.keyJump));
			ImGui::SameLine();
			if (ImGui::Button("Change##Jump")) {
				PushKeyCodeRecorder(mApp, &kb.keyJump, &kb.pressedJump);
			}

			ImGui::Text("Attack (%s)", ImGui::GetKeyNameGlfw(kb.keyAttack));
			ImGui::SameLine();
			if (ImGui::Button("Change##Attack")) {
				PushKeyCodeRecorder(mApp, &kb.keyAttack, &kb.pressedAttack);
			}
		} break;

		case GameObject::KD_SimpleGeometry: {
			auto sg = static_cast<SimpleGeometryObject*>(object);

			float bounds[6] = {
				/*x1*/ -sg->GetSize().x / 2.0f,
				/*y1*/ -sg->GetSize().y / 2.0f,
				/*z1*/ -sg->GetSize().z / 2.0f,
				/*x2*/ +sg->GetSize().x / 2.0f,
				/*y2*/ +sg->GetSize().y / 2.0f,
				/*z2*/ +sg->GetSize().z / 2.0f,
			};

			ShowInspector(bounds);
			ShowGuizmo(bounds);
			ImGui::Separator();

			sg->SetSize(glm::vec3(bounds[3] - bounds[0], bounds[4] - bounds[1], bounds[5] - bounds[2]));

			auto size = sg->GetSize();
			if (ImGui::InputFloat3("Size", &size.x)) {
				sg->SetSize(size);
			}

			auto xFaceColor = sg->GetXFaceColor();
			if (ImGui::ColorEdit4("X color", &xFaceColor)) {
				sg->SetXFaceColor(xFaceColor);
			}
			auto yFaceColor = sg->GetYFaceColor();
			if (ImGui::ColorEdit4("Y color", &yFaceColor)) {
				sg->SetYFaceColor(yFaceColor);
			}
			auto zFaceColor = sg->GetZFaceColor();
			if (ImGui::ColorEdit4("Z color", &zFaceColor)) {
				sg->SetZFaceColor(zFaceColor);
			}

			if (ImGui::Button("Sync from X color")) {
				sg->SetYFaceColor(xFaceColor);
				sg->SetZFaceColor(xFaceColor);
			}
			ImGui::SameLine();
			if (ImGui::Button("Reset")) {
				sg->SetXFaceColor(kXAxisColor);
				sg->SetYFaceColor(kYAxisColor);
				sg->SetZFaceColor(kZAxisColor);
			}
		} break;

		case GameObject::KD_Building: {
			ShowInspector();
			ShowGuizmo();
			ImGui::Separator();

			auto b = static_cast<BuildingObject*>(object);
			// TODO
		} break;

		case GameObject::KD_LevelWrapper: {
			ShowInspector();
			ShowGuizmo();
			ImGui::Separator();

			auto lwo = static_cast<LevelWrapperObject*>(object);
			// TODO
		} break;

		default: {
			ShowInspector();
			ShowGuizmo();
		} break;
	}
}

void EditorInstance::OpenSpriteViewer(SpriteDefinition* sprite) {
	mSpriteView_Instance.Attach(sprite);
	mSpriteView_Frame = 0;
	mSpriteView_OpenNextFrame = true;
}

void EditorInstance::ShowSpriteViewer() {
	if (mSpriteView_Instance == nullptr) return;
	if (!mSpriteView_Instance->IsValid()) return;

	if (mSpriteView_OpenNextFrame) {
		mSpriteView_OpenNextFrame = false;
		ImGui::OpenPopup("Sprite Viewer");
	}

	bool windowOpen = true;
	if (ImGui::BeginPopupModal("Sprite Viewer", &windowOpen)) {
		auto atlas = mSpriteView_Instance->GetAtlas();
		auto atlasSize = atlas->GetInfo().size;
		auto& frames = mSpriteView_Instance->GetFrames();

		int frameCount = mSpriteView_Instance->GetFrames().size();
		if (ImGui::Button("<")) {
			--mSpriteView_Frame;
		}
		ImGui::SameLine();
		ImGui::Text("%d/%d", mSpriteView_Frame + 1, frameCount);
		ImGui::SameLine();
		if (ImGui::Button(">")) {
			++mSpriteView_Frame;
		}
		// Scrolling down (negative value) should advance, so invert the sign
		mSpriteView_Frame += -std::round(ImGui::GetIO().MouseWheel);
		// Clamp mSpriteView_Frame to range [0, frameCount)
		if (mSpriteView_Frame < 0) {
			mSpriteView_Frame = frameCount - 1;
		} else if (mSpriteView_Frame >= frameCount) {
			mSpriteView_Frame = 0;
		}

		auto& currFrame = frames[mSpriteView_Frame];
		auto boundingBox = mSpriteView_Instance->GetBoundingBox();
		ImGui::Text("Frame size: (%d, %d)", boundingBox.x, boundingBox.y);
		ImGui::Text("Frame location: (%f, %f) to (%f, %f)", currFrame.u0, currFrame.v0, currFrame.u1, currFrame.v1);
		ImGui::Image(
			(ImTextureID)(uintptr_t)atlas->GetHandle(),
			Utils::FitImage(atlasSize),
			ImVec2(currFrame.u0, currFrame.v0),
			ImVec2(currFrame.u1, currFrame.v1));

		ImGui::EndPopup();
	}
}