#include "window.hpp"

#include <hex.hpp>

#include <hex/api/plugin_manager.hpp>
#include <hex/api/content_registry.hpp>
#include <hex/api/imhex_api.hpp>
#include <hex/api/layout_manager.hpp>

#include <hex/helpers/utils.hpp>
#include <hex/helpers/fs.hpp>
#include <hex/helpers/logger.hpp>
#include <hex/helpers/stacktrace.hpp>

#include <hex/ui/view.hpp>
#include <hex/ui/popup.hpp>

#include <chrono>
#include <csignal>
#include <set>
#include <thread>
#include <cassert>

#include <romfs/romfs.hpp>

#include <imgui.h>
#include <imgui_internal.h>
#include <imgui_impl_glfw.h>
#include <imgui_impl_opengl3.h>
#include <hex/ui/imgui_imhex_extensions.h>
#include <implot.h>
#include <implot_internal.h>
#include <imnodes.h>
#include <imnodes_internal.h>

#include <fonts/codicons_font.h>

#include <hex/api/project_file_manager.hpp>

#include <GLFW/glfw3.h>

namespace hex {

    using namespace std::literals::chrono_literals;

    static std::fs::path s_imguiSettingsPath;

    /**
     * @brief returns the path to load/save imgui settings to, or an empty path if no location was found
     */
    std::fs::path getImGuiSettingsPath() {
        return s_imguiSettingsPath;
    }

    Window::Window() {
        stacktrace::initialize();

        constexpr static auto openEmergencyPopup = [](const std::string &title){
            TaskManager::doLater([title] {
                for (const auto &provider : ImHexApi::Provider::getProviders())
                    ImHexApi::Provider::remove(provider, false);

                ImGui::OpenPopup(title.c_str());
            });
        };

        // Handle fatal error popups for errors detected during initialization
        {
            for (const auto &[argument, value] : ImHexApi::System::getInitArguments()) {
                if (argument == "no-plugins") {
                    openEmergencyPopup("No Plugins");
                } else if (argument == "no-builtin-plugin") {
                    openEmergencyPopup("No Builtin Plugin");
                } else if (argument == "multiple-builtin-plugins") {
                    openEmergencyPopup("Multiple Builtin Plugins");
                }
            }
        }

        // Initialize the window
        this->initGLFW();
        this->initImGui();
        this->setupNativeWindow();
        this->registerEventHandlers();

        auto logoData      = romfs::get("logo.png");
        this->m_logoTexture = ImGui::Texture(reinterpret_cast<const ImU8 *>(logoData.data()), logoData.size());

        ContentRegistry::Settings::impl::store();
        EventManager::post<EventSettingsChanged>();
        EventManager::post<EventWindowInitialized>();
    }

    Window::~Window() {
        EventManager::unsubscribe<EventProviderDeleted>(this);
        EventManager::unsubscribe<RequestCloseImHex>(this);
        EventManager::unsubscribe<RequestUpdateWindowTitle>(this);
        EventManager::unsubscribe<EventAbnormalTermination>(this);
        EventManager::unsubscribe<RequestOpenPopup>(this);

        this->exitImGui();
        this->exitGLFW();
    }

    void Window::registerEventHandlers() {
        // Initialize default theme
        EventManager::post<RequestChangeTheme>("Dark");

        // Handle the close window request by telling GLFW to shut down
        EventManager::subscribe<RequestCloseImHex>(this, [this](bool noQuestions) {
            glfwSetWindowShouldClose(this->m_window, GLFW_TRUE);

            if (!noQuestions)
                EventManager::post<EventWindowClosing>(this->m_window);
        });

        // Handle updating the window title
        EventManager::subscribe<RequestUpdateWindowTitle>(this, [this]() {
            std::string title = "ImHex";

            if (ProjectFile::hasPath()) {
                // If a project is open, show the project name instead of the file name

                title += " - Project " + hex::limitStringLength(ProjectFile::getPath().stem().string(), 32);

                if (ImHexApi::Provider::isDirty())
                    title += " (*)";

            } else if (ImHexApi::Provider::isValid()) {
                auto provider = ImHexApi::Provider::get();
                if (provider != nullptr) {
                    title += " - " + hex::limitStringLength(provider->getName(), 32);

                    if (provider->isDirty())
                        title += " (*)";

                    if (!provider->isWritable())
                        title += " (Read Only)";
                }
            }

            this->m_windowTitle = title;

            if (this->m_window != nullptr)
                glfwSetWindowTitle(this->m_window, title.c_str());
        });

        // Handle opening popups
        EventManager::subscribe<RequestOpenPopup>(this, [this](auto name) {
            std::scoped_lock lock(this->m_popupMutex);

            this->m_popupsToOpen.push_back(name);
        });
    }

    void Window::loop() {
        while (!glfwWindowShouldClose(this->m_window)) {
            this->m_lastFrameTime = glfwGetTime();

            if (!glfwGetWindowAttrib(this->m_window, GLFW_VISIBLE) || glfwGetWindowAttrib(this->m_window, GLFW_ICONIFIED)) {
                // If the application is minimized or not visible, don't render anything
                glfwWaitEvents();
            } else {
                glfwPollEvents();

                // If no events have been received in a while, lower the frame rate
                {
                    // If the mouse is down, the mouse is moving or a popup is open, we don't want to lower the frame rate
                    if (ImGui::IsPopupOpen(ImGuiID(0), ImGuiPopupFlags_AnyPopupId) ||
                        TaskManager::getRunningTaskCount() > 0 ||
                        this->m_buttonDown ||
                        this->m_hadEvent ||
                        !this->m_pressedKeys.empty())
                    {
                        this->m_frameRateTemporarilyUnlocked = true;
                    }

                    // If the frame rate has been unlocked for 5 seconds, lock it again
                    if ((this->m_lastFrameTime - this->m_frameRateUnlockTime) > 5 && this->m_frameRateTemporarilyUnlocked) {
                        this->m_frameRateTemporarilyUnlocked = false;
                        this->m_frameRateUnlockTime = this->m_lastFrameTime;
                    }

                    // If the frame rate is locked, wait for events with a timeout
                    const auto targetFps = ImHexApi::System::getTargetFPS();
                    if (targetFps >= 200) {
                        // Frame rate is unlocked
                    } else if (targetFps < 15) {
                        // Limit frame rate to monitor refresh rate
                        glfwSwapInterval(1);
                    } else if (this->m_frameRateTemporarilyUnlocked) {
                        // Handle regular frame rate when it was temporarily unlocked
                        // Limit the frame rate to the target frame rate

                        const double timeout = std::max(0.0, (1.0 / targetFps) - (glfwGetTime() - this->m_lastFrameTime));
                        std::this_thread::sleep_for(std::chrono::milliseconds(u32(timeout * 1000)));
                        glfwSwapInterval(0);
                    } else {
                        // Handle frame rate when there's no interaction with the window
                        // Limit the frame rate to ~5 FPS

                        const double timeout = std::max(0.0, (1.0 / 5.0) - (glfwGetTime() - this->m_lastFrameTime));
                        std::this_thread::sleep_for(std::chrono::milliseconds(u32(timeout * 1000)));
                        glfwSwapInterval(0);
                    }

                    this->m_hadEvent = false;
                }
            }

            // Render frame
            this->frameBegin();
            this->frame();
            this->frameEnd();
        }
    }

    static void createNestedMenu(std::span<const std::string> menuItems, const Shortcut &shortcut, const std::function<void()> &callback, const std::function<bool()> &enabledCallback) {
        const auto &name = menuItems.front();

        if (name == ContentRegistry::Interface::impl::SeparatorValue) {
            ImGui::Separator();
            return;
        }

        if (name == ContentRegistry::Interface::impl::SubMenuValue) {
            callback();
        } else if (menuItems.size() == 1) {
            if (ImGui::MenuItem(LangEntry(name), shortcut.toString().c_str(), false, enabledCallback()))
                callback();
        } else {
            if (ImGui::BeginMenu(LangEntry(name), *(menuItems.begin() + 1) == ContentRegistry::Interface::impl::SubMenuValue ? enabledCallback() : true)) {
                createNestedMenu({ menuItems.begin() + 1, menuItems.end() }, shortcut, callback, enabledCallback);
                ImGui::EndMenu();
            }
        }
    }

    void Window::drawTitleBarBorderless() {
        auto startX = ImGui::GetCursorPosX();
        auto titleBarHeight = ImGui::GetCurrentWindow()->MenuBarHeight();
        auto buttonSize = ImVec2(titleBarHeight * 1.5F, titleBarHeight - 1);

        ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
        ImGui::PushStyleColor(ImGuiCol_Button, ImGui::GetColorU32(ImGuiCol_MenuBarBg));
        ImGui::PushStyleColor(ImGuiCol_ButtonActive, ImGui::GetColorU32(ImGuiCol_ScrollbarGrabActive));
        ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImGui::GetColorU32(ImGuiCol_ScrollbarGrabHovered));

        // custom titlebar buttons implementation for borderless window mode
        auto &titleBarButtons = ContentRegistry::Interface::impl::getTitleBarButtons();

        // Draw custom title bar buttons
        ImGui::SetCursorPosX(ImGui::GetWindowWidth() - buttonSize.x * (4 + titleBarButtons.size()));
        for (const auto &[icon, tooltip, callback] : titleBarButtons) {
            if (ImGui::TitleBarButton(icon.c_str(), buttonSize)) {
                callback();
            }
            ImGui::InfoTooltip(LangEntry(tooltip));
        }

        // Draw minimize, restore and maximize buttons
        ImGui::SetCursorPosX(ImGui::GetWindowWidth() - buttonSize.x * 3);
        if (ImGui::TitleBarButton(ICON_VS_CHROME_MINIMIZE, buttonSize))
            glfwIconifyWindow(this->m_window);
        if (glfwGetWindowAttrib(this->m_window, GLFW_MAXIMIZED)) {
            if (ImGui::TitleBarButton(ICON_VS_CHROME_RESTORE, buttonSize))
                glfwRestoreWindow(this->m_window);
        } else {
            if (ImGui::TitleBarButton(ICON_VS_CHROME_MAXIMIZE, buttonSize))
                glfwMaximizeWindow(this->m_window);
        }
        

        ImGui::PushStyleColor(ImGuiCol_ButtonActive, 0xFF7A70F1);
        ImGui::PushStyleColor(ImGuiCol_ButtonHovered, 0xFF2311E8);

        // Draw close button
        if (ImGui::TitleBarButton(ICON_VS_CHROME_CLOSE, buttonSize)) {
            ImHexApi::System::closeImHex();
        }

        ImGui::PopStyleColor(5);
        ImGui::PopStyleVar();

        ImGui::SetCursorPosX(std::max(startX, (ImGui::GetWindowWidth() - ImGui::CalcTextSize(this->m_windowTitle.c_str()).x) / 2));
        ImGui::TextUnformatted(this->m_windowTitle.c_str());
    }
    
    void Window::drawTitleBarBorder() {
        auto titleBarHeight = ImGui::GetCurrentWindow()->MenuBarHeight();
        auto buttonSize = ImVec2(titleBarHeight * 1.5F, titleBarHeight - 1);

        ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
        ImGui::PushStyleColor(ImGuiCol_Button, ImGui::GetColorU32(ImGuiCol_MenuBarBg));
        ImGui::PushStyleColor(ImGuiCol_ButtonActive, ImGui::GetColorU32(ImGuiCol_ScrollbarGrabActive));
        ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImGui::GetColorU32(ImGuiCol_ScrollbarGrabHovered));

        auto &titleBarButtons = ContentRegistry::Interface::impl::getTitleBarButtons();

        // Draw custom title bar buttons
        ImGui::SetCursorPosX(ImGui::GetWindowWidth() - buttonSize.x * (titleBarButtons.size()+0.5));
        for (const auto &[icon, tooltip, callback] : titleBarButtons) {
            if (ImGui::TitleBarButton(icon.c_str(), buttonSize)) {
                callback();
            }
            ImGui::InfoTooltip(LangEntry(tooltip));
        }

        ImGui::PopStyleColor(3);
        ImGui::PopStyleVar();
    }

    void Window::drawTitleBar() {
        if (ImHexApi::System::isBorderlessWindowModeEnabled()) {
            drawTitleBarBorderless();
        } else {
            drawTitleBarBorder();
        }
    }

    void Window::frameBegin() {
        // Start new ImGui Frame
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();

        // Handle all undocked floating windows
        ImGuiViewport *viewport = ImGui::GetMainViewport();
        ImGui::SetNextWindowPos(viewport->WorkPos);
        ImGui::SetNextWindowSize(ImHexApi::System::getMainWindowSize() - ImVec2(0, ImGui::GetTextLineHeightWithSpacing()));
        ImGui::SetNextWindowViewport(viewport->ID);
        ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0F);
        ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0F);
        ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0, 0));

        ImGuiWindowFlags windowFlags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking | ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoNavFocus | ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoScrollWithMouse;

        ImGui::GetIO().ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;

        // Render main dock space
        if (ImGui::Begin("ImHexDockSpace", nullptr, windowFlags)) {
            auto drawList = ImGui::GetWindowDrawList();
            ImGui::PopStyleVar();
            auto sidebarPos   = ImGui::GetCursorPos();
            auto sidebarWidth = ContentRegistry::Interface::impl::getSidebarItems().empty() ? 0 : 30_scaled;

            ImGui::SetCursorPosX(sidebarWidth);

            auto footerHeight  = ImGui::GetTextLineHeightWithSpacing() + ImGui::GetStyle().FramePadding.y * 2 + 1_scaled;
            auto dockSpaceSize = ImVec2(ImHexApi::System::getMainWindowSize().x - sidebarWidth, ImGui::GetContentRegionAvail().y - footerHeight);

            // Render footer
            {

                auto dockId = ImGui::DockSpace(ImGui::GetID("ImHexMainDock"), dockSpaceSize);
                ImHexApi::System::impl::setMainDockSpaceId(dockId);

                drawList->AddRectFilled(ImGui::GetWindowPos(), ImGui::GetWindowPos() + ImGui::GetWindowSize() - ImVec2(dockSpaceSize.x, footerHeight - ImGui::GetStyle().FramePadding.y - 1_scaled), ImGui::GetColorU32(ImGuiCol_MenuBarBg));

                ImGui::Separator();
                ImGui::SetCursorPosX(8);
                for (const auto &callback : ContentRegistry::Interface::impl::getFooterItems()) {
                    auto prevIdx = drawList->_VtxCurrentIdx;
                    callback();
                    auto currIdx = drawList->_VtxCurrentIdx;

                    // Only draw separator if something was actually drawn
                    if (prevIdx != currIdx) {
                        ImGui::SameLine();
                        ImGui::SeparatorEx(ImGuiSeparatorFlags_Vertical);
                        ImGui::SameLine();
                    }
                }
            }

            // Render sidebar
            {
                ImGui::SetCursorPos(sidebarPos);

                static i32 openWindow = -1;
                u32 index             = 0;
                ImGui::PushID("SideBarWindows");
                for (const auto &[icon, callback] : ContentRegistry::Interface::impl::getSidebarItems()) {
                    ImGui::SetCursorPosY(sidebarPos.y + sidebarWidth * index);

                    ImGui::PushStyleColor(ImGuiCol_Button, ImGui::GetColorU32(ImGuiCol_MenuBarBg));
                    ImGui::PushStyleColor(ImGuiCol_ButtonActive, ImGui::GetColorU32(ImGuiCol_ScrollbarGrabActive));
                    ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImGui::GetColorU32(ImGuiCol_ScrollbarGrabHovered));

                    ImGui::BeginDisabled(!ImHexApi::Provider::isValid());
                    {
                        if (ImGui::Button(icon.c_str(), ImVec2(sidebarWidth, sidebarWidth))) {
                            if (static_cast<u32>(openWindow) == index)
                                openWindow = -1;
                            else
                                openWindow = index;
                        }
                    }
                    ImGui::EndDisabled();

                    ImGui::PopStyleColor(3);

                    bool open = static_cast<u32>(openWindow) == index;
                    if (open) {
                        ImGui::SetNextWindowPos(ImGui::GetWindowPos() + sidebarPos + ImVec2(sidebarWidth - 2_scaled, 0));
                        ImGui::SetNextWindowSize(ImVec2(250_scaled, dockSpaceSize.y + ImGui::GetStyle().FramePadding.y + 2_scaled));

                        ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 1);
                        if (ImGui::Begin("Window", &open, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoTitleBar)) {
                            callback();
                        }
                        ImGui::End();
                        ImGui::PopStyleVar();
                    }

                    ImGui::NewLine();
                    index++;
                }
                ImGui::PopID();
            }

            // Render main menu
            ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0F);
            ImGui::SetNextWindowScroll(ImVec2(0, 0));
            if (ImGui::BeginMainMenuBar()) {

                if (ImHexApi::System::isBorderlessWindowModeEnabled()) {
                    auto menuBarHeight = ImGui::GetCurrentWindow()->MenuBarHeight();
                    ImGui::SetCursorPosX(5);
                    ImGui::Image(this->m_logoTexture, ImVec2(menuBarHeight, menuBarHeight));
                }

                for (const auto &[priority, menuItem] : ContentRegistry::Interface::impl::getMainMenuItems()) {
                    ImGui::GetStyle().TouchExtraPadding = scaled(ImVec2(0, 2));
                    if (ImGui::BeginMenu(LangEntry(menuItem.unlocalizedName))) {
                        ImGui::EndMenu();
                    }
                    ImGui::GetStyle().TouchExtraPadding = ImVec2(0, 0);
                }

                for (auto &[priority, menuItem] : ContentRegistry::Interface::impl::getMenuItems()) {
                    const auto &[unlocalizedNames, shortcut, callback, enabledCallback] = menuItem;
                    createNestedMenu(unlocalizedNames, shortcut, callback, enabledCallback);
                }

                this->drawTitleBar();

                ImGui::EndMainMenuBar();
            }
            ImGui::PopStyleVar();

            // Render toolbar
            if (ImGui::BeginMenuBar()) {

                for (const auto &callback : ContentRegistry::Interface::impl::getToolbarItems()) {
                    callback();
                    ImGui::SameLine();
                }

                ImGui::EndMenuBar();
            }

            this->beginNativeWindowFrame();

            drawList->AddLine(ImGui::GetWindowPos() + ImVec2(sidebarWidth - 2, 0), ImGui::GetWindowPos() + ImGui::GetWindowSize() - ImVec2(dockSpaceSize.x + 2, footerHeight - ImGui::GetStyle().FramePadding.y - 2), ImGui::GetColorU32(ImGuiCol_Separator));
            drawList->AddLine(ImGui::GetWindowPos() + ImVec2(sidebarWidth, ImGui::GetCurrentWindow()->MenuBarHeight()), ImGui::GetWindowPos() + ImVec2(ImGui::GetWindowSize().x, ImGui::GetCurrentWindow()->MenuBarHeight()), ImGui::GetColorU32(ImGuiCol_Separator));
        }
        ImGui::End();
        ImGui::PopStyleVar(2);

        // Plugin load error popups. These are not translated because they should always be readable, no matter if any localization could be loaded or not
        {
            auto drawPluginFolderTable = []() {
                ImGui::UnderlinedText("Plugin folders");
                if (ImGui::BeginTable("plugins", 2, ImGuiTableFlags_Borders | ImGuiTableFlags_RowBg | ImGuiTableFlags_ScrollY | ImGuiTableFlags_SizingFixedFit)) {
                    ImGui::TableSetupScrollFreeze(0, 1);
                    ImGui::TableSetupColumn("Path", ImGuiTableColumnFlags_WidthStretch, 0.2);
                    ImGui::TableSetupColumn("Exists", ImGuiTableColumnFlags_WidthFixed, ImGui::GetTextLineHeight() * 3);

                    ImGui::TableHeadersRow();

                    for (const auto &path : fs::getDefaultPaths(fs::ImHexPath::Plugins, true)) {
                        const auto filePath = path / "builtin.hexplug";
                        ImGui::TableNextRow();
                        ImGui::TableNextColumn();
                        ImGui::TextUnformatted(wolv::util::toUTF8String(filePath).c_str());
                        ImGui::TableNextColumn();
                        ImGui::TextUnformatted(wolv::io::fs::exists(filePath) ? ICON_VS_CHECK : ICON_VS_CLOSE);
                    }
                    ImGui::EndTable();
                }
            };

            // No plugins error popup
            ImGui::SetNextWindowPos(ImGui::GetMainViewport()->GetCenter(), ImGuiCond_Appearing, ImVec2(0.5F, 0.5F));
            if (ImGui::BeginPopupModal("No Plugins", nullptr, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoMove)) {
                ImGui::TextUnformatted("No ImHex plugins loaded (including the built-in plugin)!");
                ImGui::TextUnformatted("Make sure you installed ImHex correctly.");
                ImGui::TextUnformatted("There should be at least a 'builtin.hexplug' file in your plugins folder.");

                ImGui::NewLine();

                drawPluginFolderTable();

                ImGui::EndPopup();
            }

            // No built-in plugin error popup
            ImGui::SetNextWindowPos(ImGui::GetMainViewport()->GetCenter(), ImGuiCond_Appearing, ImVec2(0.5F, 0.5F));
            if (ImGui::BeginPopupModal("No Builtin Plugin", nullptr, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoMove)) {
                ImGui::TextUnformatted("The ImHex built-in plugins could not be loaded!");
                ImGui::TextUnformatted("Make sure you installed ImHex correctly.");
                ImGui::TextUnformatted("There should be at least a 'builtin.hexplug' file in your plugins folder.");

                ImGui::NewLine();

                drawPluginFolderTable();

                ImGui::EndPopup();
            }

            // Multiple built-in plugins error popup
            ImGui::SetNextWindowPos(ImGui::GetMainViewport()->GetCenter(), ImGuiCond_Appearing, ImVec2(0.5F, 0.5F));
            if (ImGui::BeginPopupModal("Multiple Builtin Plugins", nullptr, ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoMove)) {
                ImGui::TextUnformatted("ImHex found and attempted to load multiple built-in plugins!");
                ImGui::TextUnformatted("Make sure you installed ImHex correctly and, if needed,");
                ImGui::TextUnformatted("cleaned up older installations correctly,");
                ImGui::TextUnformatted("There should be exactly one 'builtin.hexplug' file in any one your plugin folders.");

                ImGui::NewLine();

                drawPluginFolderTable();

                ImGui::EndPopup();
            }
        }

        // Open popups when plugins requested it
        {
            std::scoped_lock lock(this->m_popupMutex);
            this->m_popupsToOpen.remove_if([](const auto &name) {
                if (ImGui::IsPopupOpen(name.c_str()))
                    return true;
                else
                    ImGui::OpenPopup(name.c_str());

                return false;
            });
        }

        // Draw popup stack
        {
            static bool popupDisplaying = false;
            static bool positionSet = false;
            static bool sizeSet = false;

            static std::unique_ptr<impl::PopupBase> currPopup;
            static LangEntry name("");

            if (auto &popups = impl::PopupBase::getOpenPopups(); !popups.empty()) {
                if (!ImGui::IsPopupOpen(ImGuiID(0), ImGuiPopupFlags_AnyPopupId)) {
                    currPopup = std::move(popups.back());
                    name = LangEntry(currPopup->getUnlocalizedName());

                    ImGui::OpenPopup(name);
                    popups.pop_back();
                }
            }

            if (currPopup != nullptr) {
                bool open = true;

                const auto &minSize = currPopup->getMinSize();
                const auto &maxSize = currPopup->getMaxSize();
                const bool hasConstraints = minSize.x != 0 && minSize.y != 0 && maxSize.x != 0 && maxSize.y != 0;

                if (hasConstraints)
                    ImGui::SetNextWindowSizeConstraints(minSize, maxSize);
                else
                    ImGui::SetNextWindowSize(ImVec2(0, 0), ImGuiCond_Appearing);

                auto* closeButton = currPopup->hasCloseButton() ? &open : nullptr;

                const auto flags = currPopup->getFlags() | (!hasConstraints ? (ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoResize) : ImGuiWindowFlags_None);

                if (!positionSet) {
                    ImGui::SetNextWindowPos(ImHexApi::System::getMainWindowPosition() + (ImHexApi::System::getMainWindowSize() / 2.0F), ImGuiCond_Always, ImVec2(0.5F, 0.5F));
                    if (sizeSet)
                        positionSet = true;
                }

                const auto createPopup = [&](bool displaying) {
                    if (displaying) {
                        currPopup->drawContent();
                        popupDisplaying = true;

                        if (ImGui::GetWindowSize().x > ImGui::GetStyle().FramePadding.x * 10)
                            sizeSet = true;

                        ImGui::EndPopup();
                    } else {
                        popupDisplaying = false;
                    }
                };

                if (currPopup->isModal())
                    createPopup(ImGui::BeginPopupModal(name, closeButton, flags));
                else
                    createPopup(ImGui::BeginPopup(name, flags));

                if (!popupDisplaying || currPopup->shouldClose()) {
                    log::debug("Closing popup '{}'", name);
                    positionSet = sizeSet = false;

                    currPopup = nullptr;
                }
            }
        }

        // Run all deferred calls
        TaskManager::runDeferredCalls();

        // Draw main menu popups
        for (auto &[priority, menuItem] : ContentRegistry::Interface::impl::getMenuItems()) {
            const auto &[unlocalizedNames, shortcut, callback, enabledCallback] = menuItem;

            if (ImGui::BeginPopup(unlocalizedNames.front().c_str())) {
                createNestedMenu({ unlocalizedNames.begin() + 1, unlocalizedNames.end() }, shortcut, callback, enabledCallback);
                ImGui::EndPopup();
            }
        }

        EventManager::post<EventFrameBegin>();
    }

    void Window::frame() {
        auto &io = ImGui::GetIO();

        const bool popupOpen = ImGui::IsPopupOpen(ImGuiID(0), ImGuiPopupFlags_AnyPopupId);

        // Loop through all views and draw them
        for (auto &[name, view] : ContentRegistry::Views::impl::getEntries()) {
            ImGui::GetCurrentContext()->NextWindowData.ClearFlags();

            // Draw always visible views
            view->drawAlwaysVisible();

            // Skip views that shouldn't be processed currently
            if (!view->shouldProcess())
                continue;

            // Draw view
            if (view->isAvailable()) {
                ImGui::SetNextWindowSizeConstraints(view->getMinSize(), view->getMaxSize());
                view->drawContent();
            }

            // Handle per-view shortcuts
            if (view->getWindowOpenState() && !popupOpen) {
                auto window    = ImGui::FindWindowByName(view->getName().c_str());
                bool hasWindow = window != nullptr;
                bool focused   = false;

                // Get the currently focused view
                if (hasWindow && !(window->Flags & ImGuiWindowFlags_Popup)) {
                    ImGui::Begin(View::toWindowName(name).c_str());

                    focused = ImGui::IsWindowFocused(ImGuiFocusedFlags_ChildWindows | ImGuiFocusedFlags_NoPopupHierarchy);
                    ImGui::End();
                }

                // Pass on currently pressed keys to the shortcut handler
                for (const auto &key : this->m_pressedKeys) {
                    ShortcutManager::process(view, io.KeyCtrl, io.KeyAlt, io.KeyShift, io.KeySuper, focused, key);
                }
            }
        }

        // Handle global shortcuts
        if (!popupOpen) {
            for (const auto &key : this->m_pressedKeys) {
                ShortcutManager::processGlobals(io.KeyCtrl, io.KeyAlt, io.KeyShift, io.KeySuper, key);
            }
        }

        this->m_pressedKeys.clear();
    }

    void Window::frameEnd() {
        EventManager::post<EventFrameEnd>();

        // Clean up all tasks that are done
        TaskManager::collectGarbage();

        this->endNativeWindowFrame();

        // Render UI
        ImGui::Render();

        int displayWidth, displayHeight;
        glfwGetFramebufferSize(this->m_window, &displayWidth, &displayHeight);
        glViewport(0, 0, displayWidth, displayHeight);
        glClearColor(0.00F, 0.00F, 0.00F, 0.00F);
        glClear(GL_COLOR_BUFFER_BIT);
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

        GLFWwindow *backup_current_context = glfwGetCurrentContext();
        ImGui::UpdatePlatformWindows();
        ImGui::RenderPlatformWindowsDefault();
        glfwMakeContextCurrent(backup_current_context);

        glfwSwapBuffers(this->m_window);

        // Process layout load requests
        // NOTE: This needs to be done before a new frame is started, otherwise ImGui won't handle docking correctly
        LayoutManager::process();
    }

    void Window::initGLFW() {
        glfwSetErrorCallback([](int error, const char *desc) {
            try {
                log::error("GLFW Error [{}] : {}", error, desc);
            } catch (const std::system_error &) {
                // Catch and ignore system error that might be thrown when too many errors are being logged to a file
            }
        });

        if (!glfwInit()) {
            log::fatal("Failed to initialize GLFW!");
            std::abort();
        }

        // Set up used OpenGL version
        #if defined(OS_MACOS)
            glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
            glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
            glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
            glfwWindowHint(GLFW_COCOA_RETINA_FRAMEBUFFER, GLFW_FALSE);
        #else
            glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
            glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
        #endif

        glfwWindowHint(GLFW_DECORATED, ImHexApi::System::isBorderlessWindowModeEnabled() ? GL_FALSE : GL_TRUE);
        glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
        glfwWindowHint(GLFW_TRANSPARENT_FRAMEBUFFER, GLFW_TRUE);
        glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);

        // Create window
        this->m_windowTitle = "ImHex";
        this->m_window      = glfwCreateWindow(1280_scaled, 720_scaled, this->m_windowTitle.c_str(), nullptr, nullptr);

        glfwSetWindowUserPointer(this->m_window, this);

        if (this->m_window == nullptr) {
            log::fatal("Failed to create window!");
            std::abort();
        }

        glfwMakeContextCurrent(this->m_window);
        glfwSwapInterval(1);

        // Center window
        GLFWmonitor *monitor = glfwGetPrimaryMonitor();
        if (monitor != nullptr) {
            const GLFWvidmode *mode = glfwGetVideoMode(monitor);
            if (mode != nullptr) {
                int monitorX, monitorY;
                glfwGetMonitorPos(monitor, &monitorX, &monitorY);

                int windowWidth, windowHeight;
                glfwGetWindowSize(this->m_window, &windowWidth, &windowHeight);

                glfwSetWindowPos(this->m_window, monitorX + (mode->width - windowWidth) / 2, monitorY + (mode->height - windowHeight) / 2);
            }
        }

        // Set up initial window position
        {
            int x = 0, y = 0;
            glfwGetWindowPos(this->m_window, &x, &y);

            ImHexApi::System::impl::setMainWindowPosition(x, y);
        }

        // Set up initial window size
        {
            int width = 0, height = 0;
            glfwGetWindowSize(this->m_window, &width, &height);
            glfwSetWindowSize(this->m_window, width, height);
            ImHexApi::System::impl::setMainWindowSize(width, height);
        }

        // Register window move callback
        glfwSetWindowPosCallback(this->m_window, [](GLFWwindow *window, int x, int y) {
            ImHexApi::System::impl::setMainWindowPosition(x, y);

            if (auto g = ImGui::GetCurrentContext(); g == nullptr || g->WithinFrameScope) return;

            auto win = static_cast<Window *>(glfwGetWindowUserPointer(window));
            win->frameBegin();
            win->frame();
            win->frameEnd();
            win->processEvent();
        });

        // Register window resize callback
        glfwSetWindowSizeCallback(this->m_window, [](GLFWwindow *window, int width, int height) {
            if (!glfwGetWindowAttrib(window, GLFW_ICONIFIED))
                ImHexApi::System::impl::setMainWindowSize(width, height);

            if (auto g = ImGui::GetCurrentContext(); g == nullptr || g->WithinFrameScope) return;

            auto win = static_cast<Window *>(glfwGetWindowUserPointer(window));
            win->frameBegin();
            win->frame();
            win->frameEnd();
            win->processEvent();
        });

        // Register mouse handling callback
        glfwSetMouseButtonCallback(this->m_window, [](GLFWwindow *window, int button, int action, int mods) {
            hex::unused(button, mods);

            auto win = static_cast<Window *>(glfwGetWindowUserPointer(window));

            if (action == GLFW_PRESS)
                win->m_buttonDown = true;
            else if (action == GLFW_RELEASE)
                win->m_buttonDown = false;
            win->processEvent();
        });

        // Register scrolling callback
        glfwSetScrollCallback(this->m_window, [](GLFWwindow *window, double xOffset, double yOffset) {
            hex::unused(xOffset, yOffset);

            auto win = static_cast<Window *>(glfwGetWindowUserPointer(window));
            win->processEvent();
        });

        // Register key press callback
        glfwSetKeyCallback(this->m_window, [](GLFWwindow *window, int key, int scancode, int action, int mods) {
            hex::unused(mods);

            auto win = static_cast<Window *>(glfwGetWindowUserPointer(window));

            if (action == GLFW_RELEASE) {
                win->m_buttonDown = false;
            } else {
                win->m_buttonDown = true;
            }

            if (key == GLFW_KEY_UNKNOWN) return;

            auto keyName = glfwGetKeyName(key, scancode);
            if (keyName != nullptr)
                key = std::toupper(keyName[0]);

            if (action == GLFW_PRESS || action == GLFW_REPEAT) {
                win->m_pressedKeys.push_back(key);
            }

            win->processEvent();
        });

        // Register cursor position callback
        glfwSetCursorPosCallback(this->m_window, [](GLFWwindow *window, double x, double y) {
            hex::unused(x, y);

            auto win = static_cast<Window *>(glfwGetWindowUserPointer(window));
            win->processEvent();
        });

        // Register window close callback
        glfwSetWindowCloseCallback(this->m_window, [](GLFWwindow *window) {
            EventManager::post<EventWindowClosing>(window);
        });

        // Register file drop callback
        glfwSetDropCallback(this->m_window, [](GLFWwindow *, int count, const char **paths) {
            // Loop over all dropped files
            for (int i = 0; i < count; i++) {
                auto path = std::fs::path(reinterpret_cast<const char8_t *>(paths[i]));

                // Check if a custom file handler can handle the file
                bool handled = false;
                for (const auto &[extensions, handler] : ContentRegistry::FileHandler::impl::getEntries()) {
                    for (const auto &extension : extensions) {
                        if (path.extension() == extension) {
                            // Pass the file to the handler and check if it was successful
                            if (!handler(path)) {
                                log::error("Handler for extensions '{}' failed to process file!", extension);
                                break;
                            }

                            handled = true;
                        }
                    }
                }

                // If no custom handler was found, just open the file regularly
                if (!handled)
                    EventManager::post<RequestOpenFile>(path);
            }
        });

        glfwSetWindowSizeLimits(this->m_window, 720_scaled, 480_scaled, GLFW_DONT_CARE, GLFW_DONT_CARE);

        glfwShowWindow(this->m_window);
    }

    void Window::initImGui() {
        IMGUI_CHECKVERSION();

        auto fonts = View::getFontAtlas();

        // Initialize ImGui and all other ImGui extensions
        GImGui   = ImGui::CreateContext(fonts);
        GImPlot  = ImPlot::CreateContext();
        GImNodes = ImNodes::CreateContext();

        ImGuiIO &io       = ImGui::GetIO();
        ImGuiStyle &style = ImGui::GetStyle();

        ImNodes::GetStyle().Flags = ImNodesStyleFlags_NodeOutline | ImNodesStyleFlags_GridLines;

        io.ConfigFlags |= ImGuiConfigFlags_DockingEnable | ImGuiConfigFlags_NavEnableKeyboard;
        io.ConfigWindowsMoveFromTitleBarOnly = true;
        io.FontGlobalScale = 1.0F;

        if (glfwGetPrimaryMonitor() != nullptr) {
            bool multiWindowEnabled = ContentRegistry::Settings::read("hex.builtin.setting.interface", "hex.builtin.setting.interface.multi_windows", 0) != 0;

            if (multiWindowEnabled)
                io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
        }

        for (auto &entry : fonts->ConfigData)
            io.Fonts->ConfigData.push_back(entry);

        io.ConfigViewportsNoTaskBarIcon = false;

        ImNodes::PushAttributeFlag(ImNodesAttributeFlags_EnableLinkDetachWithDragClick);
        ImNodes::PushAttributeFlag(ImNodesAttributeFlags_EnableLinkCreationOnSnap);

        // Allow ImNodes links to always be detached without holding down any button
        {
            static bool always = true;
            ImNodes::GetIO().LinkDetachWithModifierClick.Modifier = &always;
        }

        io.UserData = new ImGui::ImHexCustomData();

        auto scale = ImHexApi::System::getGlobalScale();
        style.ScaleAllSizes(scale);
        io.DisplayFramebufferScale = ImVec2(scale, scale);
        io.Fonts->SetTexID(fonts->TexID);

        style.WindowMenuButtonPosition = ImGuiDir_None;
        style.IndentSpacing            = 10.0F;
        style.DisplaySafeAreaPadding  = ImVec2(0.0F, 0.0F);

        // Install custom settings handler
        {
            ImGuiSettingsHandler handler;
            handler.TypeName   = "ImHex";
            handler.TypeHash   = ImHashStr("ImHex");

            handler.ReadOpenFn = [](ImGuiContext *ctx, ImGuiSettingsHandler *, const char *) -> void* { return ctx; };

            handler.ReadLineFn = [](ImGuiContext *, ImGuiSettingsHandler *, void *, const char *line) {
                for (auto &[name, view] : ContentRegistry::Views::impl::getEntries()) {
                    std::string format = view->getUnlocalizedName() + "=%d";
                    sscanf(line, format.c_str(), &view->getWindowOpenState());
                }
                for (auto &[name, function, detached] : ContentRegistry::Tools::impl::getEntries()) {
                    std::string format = name + "=%d";
                    sscanf(line, format.c_str(), &detached);
                }
            };

            handler.WriteAllFn = [](ImGuiContext *, ImGuiSettingsHandler *handler, ImGuiTextBuffer *buf) {
                buf->appendf("[%s][General]\n", handler->TypeName);

                for (auto &[name, view] : ContentRegistry::Views::impl::getEntries()) {
                    buf->appendf("%s=%d\n", name.c_str(), view->getWindowOpenState());
                }
                for (auto &[name, function, detached] : ContentRegistry::Tools::impl::getEntries()) {
                    buf->appendf("%s=%d\n", name.c_str(), detached);
                }

                buf->append("\n");
            };

            handler.UserData   = this;
            ImGui::GetCurrentContext()->SettingsHandlers.push_back(handler);

            io.IniFilename = nullptr;
            for (const auto &dir : fs::getDefaultPaths(fs::ImHexPath::Config)) {
                if (std::fs::exists(dir) && (fs::isPathWritable(dir))) {
                    s_imguiSettingsPath = dir / "interface.ini";
                    break;
                }
            }

            if (!s_imguiSettingsPath.empty() && wolv::io::fs::exists(s_imguiSettingsPath)) {
                ImGui::LoadIniSettingsFromDisk(wolv::util::toUTF8String(s_imguiSettingsPath).c_str());
            }
        }

        ImGui_ImplGlfw_InitForOpenGL(this->m_window, true);

        #if defined(OS_MACOS)
            ImGui_ImplOpenGL3_Init("#version 150");
        #else
            ImGui_ImplOpenGL3_Init("#version 130");
        #endif

        for (const auto &plugin : PluginManager::getPlugins())
            plugin.setImGuiContext(ImGui::GetCurrentContext());

        EventManager::post<RequestInitThemeHandlers>();
    }

    void Window::exitGLFW() {
        glfwDestroyWindow(this->m_window);
        glfwTerminate();

        this->m_window = nullptr;
    }

    void Window::exitImGui() {
        delete static_cast<ImGui::ImHexCustomData *>(ImGui::GetIO().UserData);

        ImGui::SaveIniSettingsToDisk(wolv::util::toUTF8String(s_imguiSettingsPath).c_str());

        ImGui_ImplOpenGL3_Shutdown();
        ImGui_ImplGlfw_Shutdown();
        ImPlot::DestroyContext();
        ImGui::DestroyContext();
    }

}