// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later

#include <array>
#include <atomic>
#include <memory>
#include <utility>

#include "game_settings.h"
#include "audio_core/audio_core.h"
#include "common/fs/fs.h"
#include "common/logging.h"
#include "common/settings.h"
#include "common/settings_enums.h"
#include "common/string_util.h"
#include "core/arm/exclusive_monitor.h"
#include "core/core.h"

#include "launch_timestamp_cache.h"
#include "core/core_timing.h"
#include "core/cpu_manager.h"
#include "core/debugger/debugger.h"
#include "core/device_memory.h"
#include "core/file_sys/fs_filesystem.h"
#include "core/file_sys/patch_manager.h"
#include "core/file_sys/registered_cache.h"
#include "core/file_sys/romfs_factory.h"
#include "core/file_sys/savedata_factory.h"
#include "core/file_sys/vfs/vfs_concat.h"
#include "core/file_sys/vfs/vfs_real.h"
#include "core/gpu_dirty_memory_manager.h"
#include "core/hle/kernel/k_memory_manager.h"
#include "core/hle/kernel/k_process.h"
#include "core/hle/kernel/k_resource_limit.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/physical_core.h"
#include "core/hle/service/acc/profile_manager.h"
#include "core/hle/service/am/applet_manager.h"
#include "core/hle/service/am/frontend/applets.h"
#include "core/hle/service/am/process_creation.h"
#include "core/hle/service/apm/apm_controller.h"
#include "core/hle/service/filesystem/filesystem.h"
#include "core/hle/service/glue/glue_manager.h"
#include "core/hle/service/glue/time/static.h"
#include "core/hle/service/psc/time/static.h"
#include "core/hle/service/psc/time/steady_clock.h"
#include "core/hle/service/psc/time/system_clock.h"
#include "core/hle/service/psc/time/time_zone_service.h"
#include "core/hle/service/service.h"
#include "core/hle/service/services.h"
#include "core/hle/service/set/system_settings_server.h"
#include "core/hle/service/sm/sm.h"
#include "core/internal_network/network.h"
#include "core/loader/loader.h"
#include "core/memory.h"
#include "core/memory/cheat_engine.h"
#include "core/perf_stats.h"
#include "core/reporter.h"
#include "core/tools/freezer.h"
#include "core/tools/renderdoc.h"
#include "hid_core/hid_core.h"
#include "network/network.h"
#include "video_core/host1x/host1x.h"
#include "video_core/renderer_base.h"
#include "video_core/video_core.h"

namespace Core {

FileSys::VirtualFile GetGameFileFromPath(const FileSys::VirtualFilesystem& vfs,
                                         const std::string& path) {
    // To account for split 00+01+etc files.
    std::string dir_name;
    std::string filename;
    Common::SplitPath(path, &dir_name, &filename, nullptr);

    if (filename == "00") {
        const auto dir = vfs->OpenDirectory(dir_name, FileSys::OpenMode::Read);
        std::vector<FileSys::VirtualFile> concat;

        for (u32 i = 0; i < 0x10; ++i) {
            const auto file_name = fmt::format("{:02X}", i);
            auto next = dir->GetFile(file_name);

            if (next != nullptr) {
                concat.push_back(std::move(next));
            } else {
                next = dir->GetFile(file_name);

                if (next == nullptr) {
                    break;
                }

                concat.push_back(std::move(next));
            }
        }

        return FileSys::ConcatenatedVfsFile::MakeConcatenatedFile(dir->GetName(),
                                                                  std::move(concat));
    }

    if (Common::FS::IsDir(path)) {
        return vfs->OpenFile(path + "/main", FileSys::OpenMode::Read);
    }

    return vfs->OpenFile(path, FileSys::OpenMode::Read);
}

struct System::Impl {
    explicit Impl(System& system)
        : kernel{system}, fs_controller{system}, hid_core{}, cpu_manager{system},
          reporter{system}, applet_manager{system}, frontend_applets{system}, profile_manager{} {}

    u64 program_id;

    void Initialize(System& system) {
        device_memory.emplace();

        is_multicore = Settings::values.use_multi_core.GetValue();
        extended_memory_layout = Settings::values.memory_layout_mode.GetValue() != Settings::MemoryLayout::Memory_4Gb;

        core_timing.SetMulticore(is_multicore);
        core_timing.Initialize([&system]() { system.RegisterHostThread(); });

        // Create a default fs if one doesn't already exist.
        if (virtual_filesystem == nullptr) {
            virtual_filesystem = std::make_shared<FileSys::RealVfsFilesystem>();
        }
        if (content_provider == nullptr) {
            content_provider = std::make_unique<FileSys::ContentProviderUnion>();
        }

        // Create default implementations of applets if one is not provided.
        frontend_applets.SetDefaultAppletsIfMissing();

        auto const is_async_gpu = Settings::values.use_asynchronous_gpu_emulation.GetValue();

        kernel.SetMulticore(is_multicore);
        cpu_manager.SetMulticore(is_multicore);
        cpu_manager.SetAsyncGpu(is_async_gpu);
    }

    void ReinitializeIfNecessary(System& system) {
        const bool must_reinitialize =
            !device_memory.has_value() ||
            is_multicore != Settings::values.use_multi_core.GetValue() ||
            extended_memory_layout != (Settings::values.memory_layout_mode.GetValue() !=
                                       Settings::MemoryLayout::Memory_4Gb);

        if (!must_reinitialize) {
            return;
        }

        LOG_DEBUG(Kernel, "Re-initializing");

        is_multicore = Settings::values.use_multi_core.GetValue();
        extended_memory_layout =
            Settings::values.memory_layout_mode.GetValue() != Settings::MemoryLayout::Memory_4Gb;

        Initialize(system);
    }

    void RefreshTime(System& system) {
        if (!system.IsPoweredOn()) {
            return;
        }

        auto settings_service =
            system.ServiceManager().GetService<Service::Set::ISystemSettingsServer>("set:sys",
                                                                                    true);
        auto static_service_a =
            system.ServiceManager().GetService<Service::Glue::Time::StaticService>("time:a", true);

        auto static_service_s =
            system.ServiceManager().GetService<Service::PSC::Time::StaticService>("time:s", true);

        std::shared_ptr<Service::PSC::Time::SystemClock> user_clock;
        static_service_a->GetStandardUserSystemClock(&user_clock);

        std::shared_ptr<Service::PSC::Time::SystemClock> local_clock;
        static_service_a->GetStandardLocalSystemClock(&local_clock);

        std::shared_ptr<Service::PSC::Time::SystemClock> network_clock;
        static_service_s->GetStandardNetworkSystemClock(&network_clock);

        std::shared_ptr<Service::Glue::Time::TimeZoneService> timezone_service;
        static_service_a->GetTimeZoneService(&timezone_service);

        Service::PSC::Time::LocationName name{};
        auto new_name = Settings::GetTimeZoneString(Settings::values.time_zone_index.GetValue());
        std::memcpy(name.data(), new_name.data(), (std::min)(name.size(), new_name.size()));

        timezone_service->SetDeviceLocationName(name);

        u64 time_offset = 0;
        if (Settings::values.custom_rtc_enabled) {
            time_offset = Settings::values.custom_rtc_offset.GetValue();
        }

        const auto posix_time = std::chrono::system_clock::now().time_since_epoch();
        const u64 current_time =
            +std::chrono::duration_cast<std::chrono::seconds>(posix_time).count();
        const u64 new_time = current_time + time_offset;

        Service::PSC::Time::SystemClockContext context{};
        settings_service->SetUserSystemClockContext(context);
        user_clock->SetCurrentTime(new_time);

        local_clock->SetCurrentTime(new_time);

        network_clock->GetSystemClockContext(&context);
        settings_service->SetNetworkSystemClockContext(context);
        network_clock->SetCurrentTime(new_time);
    }

    void Run() {
        std::unique_lock<std::mutex> lk(suspend_guard);

        kernel.SuspendEmulation(false);
        core_timing.SyncPause(false);
        is_paused.store(false, std::memory_order_relaxed);
    }

    void Pause() {
        std::unique_lock<std::mutex> lk(suspend_guard);

        core_timing.SyncPause(true);
        kernel.SuspendEmulation(true);
        is_paused.store(true, std::memory_order_relaxed);
    }

    bool IsPaused() const {
        return is_paused.load(std::memory_order_relaxed);
    }

    std::unique_lock<std::mutex> StallApplication() {
        std::unique_lock<std::mutex> lk(suspend_guard);
        kernel.SuspendEmulation(true);
        core_timing.SyncPause(true);
        return lk;
    }

    void UnstallApplication() {
        if (!IsPaused()) {
            core_timing.SyncPause(false);
            kernel.SuspendEmulation(false);
        }
    }

    void SetNVDECActive(bool is_nvdec_active) {
        nvdec_active = is_nvdec_active;
    }

    bool GetNVDECActive() {
        return nvdec_active;
    }

    void InitializeDebugger(System& system, u16 port) {
        debugger.emplace(system, port);
    }

    void InitializeKernel(System& system) {
        LOG_DEBUG(Core, "initialized OK");

        // Setting changes may require a full system reinitialization (e.g., disabling multicore).
        ReinitializeIfNecessary(system);

        kernel.Initialize();
        cpu_manager.Initialize();
    }

    SystemResultStatus SetupForApplicationProcess(System& system, Frontend::EmuWindow& emu_window) {
        host1x_core.emplace(system);
        gpu_core = VideoCore::CreateGPU(emu_window, system);
        if (!gpu_core)
            return SystemResultStatus::ErrorVideoCore;

        audio_core.emplace(system);

        service_manager = std::make_shared<Service::SM::ServiceManager>(kernel);
        services.emplace(service_manager, system, stop_event.get_token());

        is_powered_on = true;
        exit_locked = false;
        exit_requested = false;

        if (Settings::values.enable_renderdoc_hotkey) {
            renderdoc_api.emplace();
        }

        LOG_DEBUG(Core, "Initialized OK");

        return SystemResultStatus::Success;
    }

    SystemResultStatus Load(System& system, Frontend::EmuWindow& emu_window,
                            const std::string& filepath,
                            Service::AM::FrontendAppletParameters& params) {
        InitializeKernel(system);

        const auto file = GetGameFileFromPath(virtual_filesystem, filepath);

        // Create the application process
        Loader::ResultStatus load_result{};
        std::vector<u8> control;
        auto process = Service::AM::CreateApplicationProcess(control, app_loader, load_result, system, file, params.program_id, params.program_index);
        if (load_result != Loader::ResultStatus::Success) {
            LOG_CRITICAL(Core, "Failed to load ROM (Error {})!", load_result);
            ShutdownMainProcess();
            return SystemResultStatus(u32(SystemResultStatus::ErrorLoader) + u32(load_result));
        }

        if (!app_loader) {
            LOG_CRITICAL(Core, "Failed to obtain loader for {}!", filepath);
            return SystemResultStatus::ErrorGetLoader;
        }

        if (app_loader->ReadProgramId(params.program_id) != Loader::ResultStatus::Success) {
            LOG_ERROR(Core, "Failed to find program id for ROM!");
        }

        std::string name = "Unknown program";
        if (app_loader->ReadTitle(name) != Loader::ResultStatus::Success) {
            LOG_ERROR(Core, "Failed to read title for ROM!");
        }

        LOG_INFO(Core, "Loading {} ({:016X}) ...", name, params.program_id);

        // Track launch time for frontend launches
        LaunchTimestampCache::SaveLaunchTimestamp(params.program_id);

        // Make the process created be the application
        kernel.MakeApplicationProcess(process->GetHandle());

        // Set up the rest of the system.
        SystemResultStatus init_result{SetupForApplicationProcess(system, emu_window)};
        if (init_result != SystemResultStatus::Success) {
            LOG_CRITICAL(Core, "Failed to initialize system (Error {})!", int(init_result));
            ShutdownMainProcess();
            return init_result;
        }

        // Initialize cheat engine
        if (cheat_engine) {
            cheat_engine->Initialize();
        }

        // Register with applet manager
        // All threads are started, begin main process execution, now that we're in the clear
        applet_manager.CreateAndInsertByFrontendAppletParameters(std::move(process), params);

        if (Settings::values.gamecard_inserted) {
            if (Settings::values.gamecard_current_game) {
                fs_controller.SetGameCard(GetGameFileFromPath(virtual_filesystem, filepath));
            } else if (!Settings::values.gamecard_path.GetValue().empty()) {
                const auto& gamecard_path = Settings::values.gamecard_path.GetValue();
                fs_controller.SetGameCard(GetGameFileFromPath(virtual_filesystem, gamecard_path));
            }
        }

        perf_stats.emplace(params.program_id);
        // Reset counters and set time origin to current frame
        GetAndResetPerfStats();
        perf_stats->BeginSystemFrame();

        const FileSys::PatchManager pm(params.program_id, system.GetFileSystemController(), system.GetContentProvider());
        auto const metadata = pm.GetControlMetadata();
        std::string title_version = metadata.first != nullptr ? metadata.first->GetVersionString() : "";

        if (app_loader->ReadProgramId(program_id) != Loader::ResultStatus::Success) {
            LOG_ERROR(Core, "Failed to find program id for ROM");
        }

        GameSettings::LoadOverrides(program_id, gpu_core->Renderer());
        if (auto room_member = Network::GetRoomMember().lock()) {
            Network::GameInfo game_info;
            game_info.name = name;
            game_info.id = params.program_id;
            game_info.version = title_version;
            room_member->SendGameInfo(game_info);
        }
        return SystemResultStatus::Success;
    }

    void ShutdownMainProcess() {
        SetShuttingDown(true);

        // Reset per-game flags
        Settings::values.use_squashed_iterated_blend = false;

        is_powered_on = false;
        exit_locked = false;
        exit_requested = false;

        if (gpu_core != nullptr) {
            gpu_core->NotifyShutdown();
        }

        stop_event.request_stop();
        core_timing.SyncPause(false);
        Network::CancelPendingSocketOperations();
        kernel.SuspendEmulation(true);
        kernel.CloseServices();
        kernel.ShutdownCores();
        services.reset();
        service_manager.reset();
        fs_controller.Reset();
        cheat_engine.reset();
        core_timing.ClearPendingEvents();
        app_loader.reset();
        audio_core.reset();
        gpu_core.reset();
        host1x_core.reset();
        perf_stats.reset();
        cpu_manager.Shutdown();
        debugger.reset();
        kernel.Shutdown();
        stop_event = {};
        Network::RestartSocketOperations();

        if (auto room_member = Network::GetRoomMember().lock()) {
            Network::GameInfo game_info{};
            room_member->SendGameInfo(game_info);
        }

        // Reset all glue registrations
        arp_manager.ResetAll();

        LOG_DEBUG(Core, "Shutdown OK");
    }

    bool IsShuttingDown() const {
        return is_shutting_down;
    }

    void SetShuttingDown(bool shutting_down) {
        is_shutting_down = shutting_down;
    }

    Loader::ResultStatus GetGameName(std::string& out) const {
        return app_loader ? app_loader->ReadTitle(out) : Loader::ResultStatus::ErrorNotInitialized;
    }

    PerfStatsResults GetAndResetPerfStats() {
        return perf_stats->GetAndResetStats(core_timing.GetGlobalTimeUs());
    }

    Timing::CoreTiming core_timing;
    Kernel::KernelCore kernel;
    /// RealVfsFilesystem instance
    FileSys::VirtualFilesystem virtual_filesystem;
    Service::FileSystem::FileSystemController fs_controller;
    Core::HID::HIDCore hid_core;
    CpuManager cpu_manager;
    Reporter reporter;
    /// Applets
    Service::AM::AppletManager applet_manager;
    Service::AM::Frontend::FrontendAppletHolder frontend_applets;
    /// APM (Performance) services
    Service::APM::Controller apm_controller{core_timing};
    /// Service State
    Service::Glue::ARPManager arp_manager;
    Service::Account::ProfileManager profile_manager;
    /// Network instance
    Network::NetworkInstance network_instance;
    Core::SpeedLimiter speed_limiter;
    ExecuteProgramCallback execute_program_callback;
    ExitCallback exit_callback;

    std::optional<Service::Services> services;
    std::optional<Core::Debugger> debugger;
    std::optional<Service::KernelHelpers::ServiceContext> general_channel_context;
    std::optional<Service::Event> general_channel_event;
    std::optional<Core::PerfStats> perf_stats;
    std::optional<Tegra::Host1x::Host1x> host1x_core;
    std::optional<Core::DeviceMemory> device_memory;
    std::optional<AudioCore::AudioCore> audio_core;
    std::optional<Memory::CheatEngine> cheat_engine;
    std::optional<Tools::Freezer> memory_freezer;
    std::optional<Tools::RenderdocAPI> renderdoc_api;

    std::array<Core::GPUDirtyMemoryManager, Core::Hardware::NUM_CPU_CORES> gpu_dirty_memory_managers;
    std::vector<std::vector<u8>> user_channel;
    std::vector<std::vector<u8>> general_channel;

    std::array<u64, Core::Hardware::NUM_CPU_CORES> dynarmic_ticks{};
    std::array<u8, 0x20> build_id{};

    /// Service manager
    std::shared_ptr<Service::SM::ServiceManager> service_manager;
    /// ContentProviderUnion instance
    std::unique_ptr<FileSys::ContentProviderUnion> content_provider;
    /// AppLoader used to load the current executing application
    std::unique_ptr<Loader::AppLoader> app_loader;
    std::unique_ptr<Tegra::GPU> gpu_core;
    std::stop_source stop_event;

    mutable std::mutex suspend_guard;
    std::mutex general_channel_mutex;
    std::atomic_bool is_paused{};
    std::atomic_bool is_shutting_down{};
    std::atomic_bool is_powered_on{};
    bool is_multicore : 1 = false;
    bool extended_memory_layout : 1 = false;
    bool exit_locked : 1 = false;
    bool exit_requested : 1 = false;
    bool nvdec_active : 1 = false;

    void EnsureGeneralChannelInitialized(System& system) {
        if (!general_channel_event) {
            general_channel_context.emplace(system, "GeneralChannel");
            general_channel_event.emplace(*general_channel_context);
        }
    }
};

System::System() : impl{std::make_unique<Impl>(*this)} {}

System::~System() = default;

CpuManager& System::GetCpuManager() {
    return impl->cpu_manager;
}

const CpuManager& System::GetCpuManager() const {
    return impl->cpu_manager;
}

void System::Initialize() {
    impl->Initialize(*this);
}

void System::Run() {
    impl->Run();
}

void System::Pause() {
    impl->Pause();
}

bool System::IsPaused() const {
    return impl->IsPaused();
}

void System::ShutdownMainProcess() {
    impl->ShutdownMainProcess();
}

bool System::IsShuttingDown() const {
    return impl->IsShuttingDown();
}

void System::SetShuttingDown(bool shutting_down) {
    impl->SetShuttingDown(shutting_down);
}

void System::DetachDebugger() {
    if (impl->debugger) {
        impl->debugger->NotifyShutdown();
    }
}

std::unique_lock<std::mutex> System::StallApplication() {
    return impl->StallApplication();
}

void System::UnstallApplication() {
    impl->UnstallApplication();
}

void System::SetNVDECActive(bool is_nvdec_active) {
    impl->SetNVDECActive(is_nvdec_active);
}

bool System::GetNVDECActive() {
    return impl->GetNVDECActive();
}

void System::InitializeDebugger() {
    impl->InitializeDebugger(*this, Settings::values.gdbstub_port.GetValue());
}

SystemResultStatus System::Load(Frontend::EmuWindow& emu_window, const std::string& filepath,
                                Service::AM::FrontendAppletParameters& params) {
    return impl->Load(*this, emu_window, filepath, params);
}

bool System::IsPoweredOn() const {
    return impl->is_powered_on.load(std::memory_order::relaxed);
}

void System::PrepareReschedule(const u32 core_index) {
    impl->kernel.PrepareReschedule(core_index);
}

size_t System::GetCurrentHostThreadID() const {
    return impl->kernel.GetCurrentHostThreadID();
}

std::span<GPUDirtyMemoryManager> System::GetGPUDirtyMemoryManager() {
    return impl->gpu_dirty_memory_managers;
}

void System::GatherGPUDirtyMemory(std::function<void(PAddr, size_t)>& callback) {
    for (auto& manager : impl->gpu_dirty_memory_managers) {
        manager.Gather(callback);
    }
}

PerfStatsResults System::GetAndResetPerfStats() {
    return impl->GetAndResetPerfStats();
}

Kernel::PhysicalCore& System::CurrentPhysicalCore() {
    return impl->kernel.CurrentPhysicalCore();
}

const Kernel::PhysicalCore& System::CurrentPhysicalCore() const {
    return impl->kernel.CurrentPhysicalCore();
}

/// Gets the global scheduler
Kernel::GlobalSchedulerContext& System::GlobalSchedulerContext() {
    return impl->kernel.GlobalSchedulerContext();
}

/// Gets the global scheduler
const Kernel::GlobalSchedulerContext& System::GlobalSchedulerContext() const {
    return impl->kernel.GlobalSchedulerContext();
}

Kernel::KProcess* System::ApplicationProcess() {
    return impl->kernel.ApplicationProcess();
}

Core::DeviceMemory& System::DeviceMemory() {
    return *impl->device_memory;
}

const Core::DeviceMemory& System::DeviceMemory() const {
    return *impl->device_memory;
}

const Kernel::KProcess* System::ApplicationProcess() const {
    return impl->kernel.ApplicationProcess();
}

Memory::Memory& System::ApplicationMemory() {
    return impl->kernel.ApplicationProcess()->GetMemory();
}

const Core::Memory::Memory& System::ApplicationMemory() const {
    return impl->kernel.ApplicationProcess()->GetMemory();
}

Tegra::GPU& System::GPU() {
    return *impl->gpu_core;
}

const Tegra::GPU& System::GPU() const {
    return *impl->gpu_core;
}

Tegra::Host1x::Host1x& System::Host1x() {
    return *impl->host1x_core;
}

const Tegra::Host1x::Host1x& System::Host1x() const {
    return *impl->host1x_core;
}

VideoCore::RendererBase& System::Renderer() {
    return impl->gpu_core->Renderer();
}

const VideoCore::RendererBase& System::Renderer() const {
    return impl->gpu_core->Renderer();
}

Kernel::KernelCore& System::Kernel() {
    return impl->kernel;
}

const Kernel::KernelCore& System::Kernel() const {
    return impl->kernel;
}

HID::HIDCore& System::HIDCore() {
    return impl->hid_core;
}

const HID::HIDCore& System::HIDCore() const {
    return impl->hid_core;
}

AudioCore::AudioCore& System::AudioCore() {
    return *impl->audio_core;
}

const AudioCore::AudioCore& System::AudioCore() const {
    return *impl->audio_core;
}

Timing::CoreTiming& System::CoreTiming() {
    return impl->core_timing;
}

const Timing::CoreTiming& System::CoreTiming() const {
    return impl->core_timing;
}

Core::PerfStats& System::GetPerfStats() {
    return *impl->perf_stats;
}

const Core::PerfStats& System::GetPerfStats() const {
    return *impl->perf_stats;
}

Core::SpeedLimiter& System::SpeedLimiter() {
    return impl->speed_limiter;
}

const Core::SpeedLimiter& System::SpeedLimiter() const {
    return impl->speed_limiter;
}

u64 System::GetApplicationProcessProgramID() const {
    return impl->kernel.ApplicationProcess()->GetProgramId();
}

Loader::ResultStatus System::GetGameName(std::string& out) const {
    return impl->GetGameName(out);
}

Loader::AppLoader& System::GetAppLoader() {
    return *impl->app_loader;
}

const Loader::AppLoader& System::GetAppLoader() const {
    return *impl->app_loader;
}

void System::SetFilesystem(FileSys::VirtualFilesystem vfs) {
    impl->virtual_filesystem = std::move(vfs);
}

FileSys::VirtualFilesystem System::GetFilesystem() const {
    return impl->virtual_filesystem;
}

void System::RegisterCheatList(const std::vector<Memory::CheatEntry>& list,
                               const std::array<u8, 32>& build_id, u64 main_region_begin,
                               u64 main_region_size) {
    impl->cheat_engine.emplace(*this, list, build_id);
    impl->cheat_engine->SetMainMemoryParameters(main_region_begin, main_region_size);
}

void System::SetFrontendAppletSet(Service::AM::Frontend::FrontendAppletSet&& set) {
    impl->frontend_applets.SetFrontendAppletSet(std::move(set));
}

Service::AM::Frontend::FrontendAppletHolder& System::GetFrontendAppletHolder() {
    return impl->frontend_applets;
}

const Service::AM::Frontend::FrontendAppletHolder& System::GetFrontendAppletHolder() const {
    return impl->frontend_applets;
}

Service::AM::AppletManager& System::GetAppletManager() {
    return impl->applet_manager;
}

void System::SetContentProvider(std::unique_ptr<FileSys::ContentProviderUnion> provider) {
    impl->content_provider = std::move(provider);
}

FileSys::ContentProvider& System::GetContentProvider() {
    return *impl->content_provider;
}

const FileSys::ContentProvider& System::GetContentProvider() const {
    return *impl->content_provider;
}

FileSys::ContentProviderUnion& System::GetContentProviderUnion() {
    return *impl->content_provider;
}

const FileSys::ContentProviderUnion& System::GetContentProviderUnion() const {
    return *impl->content_provider;
}

Service::FileSystem::FileSystemController& System::GetFileSystemController() {
    return impl->fs_controller;
}

const Service::FileSystem::FileSystemController& System::GetFileSystemController() const {
    return impl->fs_controller;
}

void System::RegisterContentProvider(FileSys::ContentProviderUnionSlot slot,
                                     FileSys::ContentProvider* provider) {
    impl->content_provider->SetSlot(slot, provider);
}

const Reporter& System::GetReporter() const {
    return impl->reporter;
}

Service::Glue::ARPManager& System::GetARPManager() {
    return impl->arp_manager;
}

const Service::Glue::ARPManager& System::GetARPManager() const {
    return impl->arp_manager;
}

Service::APM::Controller& System::GetAPMController() {
    return impl->apm_controller;
}

const Service::APM::Controller& System::GetAPMController() const {
    return impl->apm_controller;
}

Service::Account::ProfileManager& System::GetProfileManager() {
    return impl->profile_manager;
}

const Service::Account::ProfileManager& System::GetProfileManager() const {
    return impl->profile_manager;
}

void System::SetExitLocked(bool locked) {
    impl->exit_locked = locked;
}

bool System::GetExitLocked() const {
    return impl->exit_locked;
}

void System::SetExitRequested(bool requested) {
    impl->exit_requested = requested;
}

bool System::GetExitRequested() const {
    return impl->exit_requested;
}

void System::SetApplicationProcessBuildID(const CurrentBuildProcessID& id) {
    impl->build_id = id;
}

const System::CurrentBuildProcessID& System::GetApplicationProcessBuildID() const {
    return impl->build_id;
}

Service::SM::ServiceManager& System::ServiceManager() {
    return *impl->service_manager;
}

const Service::SM::ServiceManager& System::ServiceManager() const {
    return *impl->service_manager;
}

void System::RegisterCoreThread(std::size_t id) {
    impl->kernel.RegisterCoreThread(id);
}

void System::RegisterHostThread() {
    impl->kernel.RegisterHostThread();
}

bool System::IsMulticore() const {
    return impl->is_multicore;
}

bool System::DebuggerEnabled() const {
    return Settings::values.use_gdbstub.GetValue();
}

Core::Debugger& System::GetDebugger() {
    return *impl->debugger;
}

const Core::Debugger& System::GetDebugger() const {
    return *impl->debugger;
}

Tools::RenderdocAPI& System::GetRenderdocAPI() {
    return *impl->renderdoc_api;
}

void System::RunServer(std::unique_ptr<Service::ServerManager>&& server_manager) {
    return impl->kernel.RunServer(std::move(server_manager));
}

void System::RegisterExecuteProgramCallback(ExecuteProgramCallback&& callback) {
    impl->execute_program_callback = std::move(callback);
}

void System::ExecuteProgram(std::size_t program_index) {
    if (impl->execute_program_callback) {
        impl->execute_program_callback(program_index);
    } else {
        LOG_CRITICAL(Core, "execute_program_callback must be initialized by the frontend");
    }
}

/// @brief Gets a reference to the user channel stack.
/// It is used to transfer data between programs.
std::vector<std::vector<u8>>& System::GetUserChannel() {
    return impl->user_channel;
}

std::vector<std::vector<u8>>& System::GetGeneralChannel() {
    return impl->general_channel;
}

void System::PushGeneralChannelData(std::vector<u8>&& data) {
    std::scoped_lock lk{impl->general_channel_mutex};
    impl->EnsureGeneralChannelInitialized(*this);
    const bool was_empty = impl->general_channel.empty();
    impl->general_channel.push_back(std::move(data));
    if (was_empty) {
        impl->general_channel_event->Signal();
    }
}

bool System::TryPopGeneralChannel(std::vector<u8>& out_data) {
    std::scoped_lock lk{impl->general_channel_mutex};
    if (!impl->general_channel_event || impl->general_channel.empty()) {
        return false;
    }
    out_data = std::move(impl->general_channel.back());
    impl->general_channel.pop_back();
    if (impl->general_channel.empty()) {
        impl->general_channel_event->Clear();
    }
    return true;
}

Service::Event& System::GetGeneralChannelEvent() {
    std::scoped_lock lk{impl->general_channel_mutex};
    impl->EnsureGeneralChannelInitialized(*this);
    return *impl->general_channel_event;
}

void System::RegisterExitCallback(ExitCallback&& callback) {
    impl->exit_callback = std::move(callback);
}

void System::Exit() {
    if (impl->exit_callback) {
        impl->exit_callback();
    } else {
        LOG_CRITICAL(Core, "exit_callback must be initialized by the frontend");
    }
}

void System::ApplySettings() {
    impl->RefreshTime(*this);

    if (IsPoweredOn()) {
        Renderer().RefreshBaseSettings();
    }
}

} // namespace Core
