/*
    Copyright 2016-2023 melonDS team

    This file is part of melonDS.

    melonDS is free software: you can redistribute it and/or modify it under
    the terms of the GNU General Public License as published by the Free
    Software Foundation, either version 3 of the License, or (at your option)
    any later version.

    melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with melonDS. If not, see http://www.gnu.org/licenses/.
*/

#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#include <string.h>

#include <optional>
#include <vector>
#include <string>
#include <algorithm>

#include <QProcess>
#include <QApplication>
#include <QMessageBox>
#include <QMenuBar>
#include <QMimeDatabase>
#include <QFileDialog>
#include <QInputDialog>
#include <QPaintEvent>
#include <QPainter>
#include <QKeyEvent>
#include <QMimeData>
#include <QVector>
#include <QCommandLineParser>
#ifndef _WIN32
#include <QGuiApplication>
#include <QSocketNotifier>
#include <unistd.h>
#include <sys/socket.h>
#include <signal.h>
#ifndef APPLE
#include <qpa/qplatformnativeinterface.h>
#endif
#endif

#include <SDL2/SDL.h>

#include "OpenGLSupport.h"
#include "duckstation/gl/context.h"

#include "main.h"
#include "Input.h"
#include "CheatsDialog.h"
#include "DateTimeDialog.h"
#include "EmuSettingsDialog.h"
#include "InputConfig/InputConfigDialog.h"
#include "VideoSettingsDialog.h"
#include "CameraSettingsDialog.h"
#include "AudioSettingsDialog.h"
#include "FirmwareSettingsDialog.h"
#include "PathSettingsDialog.h"
#include "MPSettingsDialog.h"
#include "WifiSettingsDialog.h"
#include "InterfaceSettingsDialog.h"
#include "ROMInfoDialog.h"
#include "RAMInfoDialog.h"
#include "TitleManagerDialog.h"
#include "PowerManagement/PowerManagementDialog.h"
#include "AudioInOut.h"

#include "types.h"
#include "version.h"

#include "FrontendUtil.h"
#include "OSD.h"

#include "Args.h"
#include "NDS.h"
#include "NDSCart.h"
#include "GBACart.h"
#include "GPU.h"
#include "SPU.h"
#include "Wifi.h"
#include "Platform.h"
#include "LocalMP.h"
#include "Config.h"
#include "RTC.h"
#include "DSi.h"
#include "DSi_I2C.h"
#include "GPU3D_Soft.h"
#include "GPU3D_OpenGL.h"

#include "Savestate.h"

#include "main_shaders.h"

#include "ROMManager.h"
#include "ArchiveUtil.h"
#include "CameraManager.h"

#include "CLI.h"

// TODO: uniform variable spelling
using namespace melonDS;
QString NdsRomMimeType = "application/x-nintendo-ds-rom";
QStringList NdsRomExtensions { ".nds", ".srl", ".dsi", ".ids" };

QString GbaRomMimeType = "application/x-gba-rom";
QStringList GbaRomExtensions { ".gba", ".agb" };


// This list of supported archive formats is based on libarchive(3) version 3.6.2 (2022-12-09).
QStringList ArchiveMimeTypes
{
#ifdef ARCHIVE_SUPPORT_ENABLED
    "application/zip",
    "application/x-7z-compressed",
    "application/vnd.rar", // *.rar
    "application/x-tar",

    "application/x-compressed-tar", // *.tar.gz
    "application/x-xz-compressed-tar",
    "application/x-bzip-compressed-tar",
    "application/x-lz4-compressed-tar",
    "application/x-zstd-compressed-tar",

    "application/x-tarz", // *.tar.Z
    "application/x-lzip-compressed-tar",
    "application/x-lzma-compressed-tar",
    "application/x-lrzip-compressed-tar",
    "application/x-tzo", // *.tar.lzo
#endif
};

QStringList ArchiveExtensions
{
#ifdef ARCHIVE_SUPPORT_ENABLED
    ".zip", ".7z", ".rar", ".tar",

    ".tar.gz", ".tgz",
    ".tar.xz", ".txz",
    ".tar.bz2", ".tbz2",
    ".tar.lz4", ".tlz4",
    ".tar.zst", ".tzst",

    ".tar.Z", ".taz",
    ".tar.lz",
    ".tar.lzma", ".tlz",
    ".tar.lrz", ".tlrz",
    ".tar.lzo", ".tzo"
#endif
};


bool RunningSomething;

MainWindow* mainWindow;
EmuThread* emuThread;

int autoScreenSizing = 0;

int videoRenderer;
bool videoSettingsDirty;

CameraManager* camManager[2];
bool camStarted[2];

//extern int AspectRatiosNum;


EmuThread::EmuThread(QObject* parent) : QThread(parent)
{
    EmuStatus = emuStatus_Exit;
    EmuRunning = emuStatus_Paused;
    EmuPauseStack = EmuPauseStackRunning;
    RunningSomething = false;

    connect(this, SIGNAL(windowUpdate()), mainWindow->panelWidget, SLOT(repaint()));
    connect(this, SIGNAL(windowTitleChange(QString)), mainWindow, SLOT(onTitleUpdate(QString)));
    connect(this, SIGNAL(windowEmuStart()), mainWindow, SLOT(onEmuStart()));
    connect(this, SIGNAL(windowEmuStop()), mainWindow, SLOT(onEmuStop()));
    connect(this, SIGNAL(windowEmuPause()), mainWindow->actPause, SLOT(trigger()));
    connect(this, SIGNAL(windowEmuReset()), mainWindow->actReset, SLOT(trigger()));
    connect(this, SIGNAL(windowEmuFrameStep()), mainWindow->actFrameStep, SLOT(trigger()));
    connect(this, SIGNAL(windowLimitFPSChange()), mainWindow->actLimitFramerate, SLOT(trigger()));
    connect(this, SIGNAL(screenLayoutChange()), mainWindow->panelWidget, SLOT(onScreenLayoutChanged()));
    connect(this, SIGNAL(windowFullscreenToggle()), mainWindow, SLOT(onFullscreenToggled()));
    connect(this, SIGNAL(swapScreensToggle()), mainWindow->actScreenSwap, SLOT(trigger()));
    connect(this, SIGNAL(screenEmphasisToggle()), mainWindow, SLOT(onScreenEmphasisToggled()));

    auto glPanel = dynamic_cast<ScreenPanelGL*>(mainWindow->panel);
    if (glPanel) glPanel->transferLayout(this);
}

std::unique_ptr<NDS> EmuThread::CreateConsole(
    std::unique_ptr<melonDS::NDSCart::CartCommon>&& ndscart,
    std::unique_ptr<melonDS::GBACart::CartCommon>&& gbacart
) noexcept
{
    auto arm7bios = ROMManager::LoadARM7BIOS();
    if (!arm7bios)
        return nullptr;

    auto arm9bios = ROMManager::LoadARM9BIOS();
    if (!arm9bios)
        return nullptr;

    auto firmware = ROMManager::LoadFirmware(Config::ConsoleType);
    if (!firmware)
        return nullptr;

#ifdef JIT_ENABLED
    JITArgs jitargs {
        static_cast<unsigned>(Config::JIT_MaxBlockSize),
        Config::JIT_LiteralOptimisations,
        Config::JIT_BranchOptimisations,
        Config::JIT_FastMemory,
    };
#endif

#ifdef GDBSTUB_ENABLED
    GDBArgs gdbargs {
        static_cast<u16>(Config::GdbPortARM7),
        static_cast<u16>(Config::GdbPortARM9),
        Config::GdbARM7BreakOnStartup,
        Config::GdbARM9BreakOnStartup,
    };
#endif

    NDSArgs ndsargs {
        std::move(ndscart),
        std::move(gbacart),
        *arm9bios,
        *arm7bios,
        std::move(*firmware),
#ifdef JIT_ENABLED
        Config::JIT_Enable ? std::make_optional(jitargs) : std::nullopt,
#else
        std::nullopt,
#endif
        static_cast<AudioBitDepth>(Config::AudioBitDepth),
        static_cast<AudioInterpolation>(Config::AudioInterp),
#ifdef GDBSTUB_ENABLED
        Config::GdbEnabled ? std::make_optional(gdbargs) : std::nullopt,
#else
        std::nullopt,
#endif
    };

    if (Config::ConsoleType == 1)
    {
        auto arm7ibios = ROMManager::LoadDSiARM7BIOS();
        if (!arm7ibios)
            return nullptr;

        auto arm9ibios = ROMManager::LoadDSiARM9BIOS();
        if (!arm9ibios)
            return nullptr;

        auto nand = ROMManager::LoadNAND(*arm7ibios);
        if (!nand)
            return nullptr;

        auto sdcard = ROMManager::LoadDSiSDCard();
        DSiArgs args {
            std::move(ndsargs),
            *arm9ibios,
            *arm7ibios,
            std::move(*nand),
            std::move(sdcard),
            Config::DSiFullBIOSBoot,
        };

        args.GBAROM = nullptr;

        return std::make_unique<melonDS::DSi>(std::move(args));
    }

    return std::make_unique<melonDS::NDS>(std::move(ndsargs));
}

bool EmuThread::UpdateConsole(UpdateConsoleNDSArgs&& ndsargs, UpdateConsoleGBAArgs&& gbaargs) noexcept
{
    // Let's get the cart we want to use;
    // if we wnat to keep the cart, we'll eject it from the existing console first.
    std::unique_ptr<NDSCart::CartCommon> nextndscart;
    if (std::holds_alternative<Keep>(ndsargs))
    { // If we want to keep the existing cart (if any)...
        nextndscart = NDS ? NDS->EjectCart() : nullptr;
        ndsargs = {};
    }
    else if (const auto ptr = std::get_if<std::unique_ptr<NDSCart::CartCommon>>(&ndsargs))
    {
        nextndscart = std::move(*ptr);
        ndsargs = {};
    }

    if (nextndscart && nextndscart->Type() == NDSCart::Homebrew)
    {
        // Load DLDISDCard will return nullopt if the SD card is disabled;
        // SetSDCard will accept nullopt, which means no SD card
        auto& homebrew = static_cast<NDSCart::CartHomebrew&>(*nextndscart);
        homebrew.SetSDCard(ROMManager::LoadDLDISDCard());
    }

    std::unique_ptr<GBACart::CartCommon> nextgbacart;
    if (std::holds_alternative<Keep>(gbaargs))
    {
        nextgbacart = NDS ? NDS->EjectGBACart() : nullptr;
    }
    else if (const auto ptr = std::get_if<std::unique_ptr<GBACart::CartCommon>>(&gbaargs))
    {
        nextgbacart = std::move(*ptr);
        gbaargs = {};
    }

    if (!NDS || NDS->ConsoleType != Config::ConsoleType)
    { // If we're switching between DS and DSi mode, or there's no console...
        // To ensure the destructor is called before a new one is created,
        // as the presence of global signal handlers still complicates things a bit
        NDS = nullptr;
        NDS::Current = nullptr;

        NDS = CreateConsole(std::move(nextndscart), std::move(nextgbacart));
        NDS->Reset();
        NDS::Current = NDS.get();

        return NDS != nullptr;
    }

    auto arm9bios = ROMManager::LoadARM9BIOS();
    if (!arm9bios)
        return false;

    auto arm7bios = ROMManager::LoadARM7BIOS();
    if (!arm7bios)
        return false;

    auto firmware = ROMManager::LoadFirmware(NDS->ConsoleType);
    if (!firmware)
        return false;

    if (NDS->ConsoleType == 1)
    { // If the console we're updating is a DSi...
        DSi& dsi = static_cast<DSi&>(*NDS);

        auto arm9ibios = ROMManager::LoadDSiARM9BIOS();
        if (!arm9ibios)
            return false;

        auto arm7ibios = ROMManager::LoadDSiARM7BIOS();
        if (!arm7ibios)
            return false;

        auto nandimage = ROMManager::LoadNAND(*arm7ibios);
        if (!nandimage)
            return false;

        auto dsisdcard = ROMManager::LoadDSiSDCard();

        dsi.SetFullBIOSBoot(Config::DSiFullBIOSBoot);
        dsi.ARM7iBIOS = *arm7ibios;
        dsi.ARM9iBIOS = *arm9ibios;
        dsi.SetNAND(std::move(*nandimage));
        dsi.SetSDCard(std::move(dsisdcard));
        // We're moving the optional, not the card
        // (inserting std::nullopt here is okay, it means no card)

        dsi.EjectGBACart();
    }

    if (NDS->ConsoleType == 0)
    {
        NDS->SetGBACart(std::move(nextgbacart));
    }

#ifdef JIT_ENABLED
    JITArgs jitargs {
        static_cast<unsigned>(Config::JIT_MaxBlockSize),
        Config::JIT_LiteralOptimisations,
        Config::JIT_BranchOptimisations,
        Config::JIT_FastMemory,
    };
    NDS->SetJITArgs(Config::JIT_Enable ? std::make_optional(jitargs) : std::nullopt);
#endif
    NDS->SetARM7BIOS(*arm7bios);
    NDS->SetARM9BIOS(*arm9bios);
    NDS->SetFirmware(std::move(*firmware));
    NDS->SetNDSCart(std::move(nextndscart));
    NDS->SPU.SetInterpolation(static_cast<AudioInterpolation>(Config::AudioInterp));
    NDS->SPU.SetDegrade10Bit(static_cast<AudioBitDepth>(Config::AudioBitDepth));

    NDS::Current = NDS.get();

    return true;
}

void EmuThread::updateScreenSettings(bool filter, const WindowInfo& windowInfo, int numScreens, int* screenKind, float* screenMatrix)
{
    screenSettingsLock.lock();

    if (lastScreenWidth != windowInfo.surface_width || lastScreenHeight != windowInfo.surface_height)
    {
        if (oglContext)
            oglContext->ResizeSurface(windowInfo.surface_width, windowInfo.surface_height);
        lastScreenWidth = windowInfo.surface_width;
        lastScreenHeight = windowInfo.surface_height;
    }

    this->filter = filter;
    this->windowInfo = windowInfo;
    this->numScreens = numScreens;
    memcpy(this->screenKind, screenKind, sizeof(int)*numScreens);
    memcpy(this->screenMatrix, screenMatrix, sizeof(float)*numScreens*6);

    screenSettingsLock.unlock();
}

void EmuThread::initOpenGL()
{
    GL::Context* windowctx = mainWindow->getOGLContext();

    oglContext = windowctx;
    oglContext->MakeCurrent();

    OpenGL::BuildShaderProgram(kScreenVS, kScreenFS, screenShaderProgram, "ScreenShader");
    GLuint pid = screenShaderProgram[2];
    glBindAttribLocation(pid, 0, "vPosition");
    glBindAttribLocation(pid, 1, "vTexcoord");
    glBindFragDataLocation(pid, 0, "oColor");

    OpenGL::LinkShaderProgram(screenShaderProgram);

    glUseProgram(pid);
    glUniform1i(glGetUniformLocation(pid, "ScreenTex"), 0);

    screenShaderScreenSizeULoc = glGetUniformLocation(pid, "uScreenSize");
    screenShaderTransformULoc = glGetUniformLocation(pid, "uTransform");

    // to prevent bleeding between both parts of the screen
    // with bilinear filtering enabled
    const int paddedHeight = 192*2+2;
    const float padPixels = 1.f / paddedHeight;

    const float vertices[] =
    {
        0.f,   0.f,    0.f, 0.f,
        0.f,   192.f,  0.f, 0.5f - padPixels,
        256.f, 192.f,  1.f, 0.5f - padPixels,
        0.f,   0.f,    0.f, 0.f,
        256.f, 192.f,  1.f, 0.5f - padPixels,
        256.f, 0.f,    1.f, 0.f,

        0.f,   0.f,    0.f, 0.5f + padPixels,
        0.f,   192.f,  0.f, 1.f,
        256.f, 192.f,  1.f, 1.f,
        0.f,   0.f,    0.f, 0.5f + padPixels,
        256.f, 192.f,  1.f, 1.f,
        256.f, 0.f,    1.f, 0.5f + padPixels
    };

    glGenBuffers(1, &screenVertexBuffer);
    glBindBuffer(GL_ARRAY_BUFFER, screenVertexBuffer);
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);

    glGenVertexArrays(1, &screenVertexArray);
    glBindVertexArray(screenVertexArray);
    glEnableVertexAttribArray(0); // position
    glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*4, (void*)(0));
    glEnableVertexAttribArray(1); // texcoord
    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*4, (void*)(2*4));

    glGenTextures(1, &screenTexture);
    glActiveTexture(GL_TEXTURE0);
    glBindTexture(GL_TEXTURE_2D, screenTexture);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, paddedHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
    // fill the padding
    u8 zeroData[256*4*4];
    memset(zeroData, 0, sizeof(zeroData));
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 192, 256, 2, GL_RGBA, GL_UNSIGNED_BYTE, zeroData);

    OSD::Init(true);

    oglContext->SetSwapInterval(Config::ScreenVSync ? Config::ScreenVSyncInterval : 0);
}

void EmuThread::deinitOpenGL()
{
    glDeleteTextures(1, &screenTexture);

    glDeleteVertexArrays(1, &screenVertexArray);
    glDeleteBuffers(1, &screenVertexBuffer);

    OpenGL::DeleteShaderProgram(screenShaderProgram);

    OSD::DeInit();

    oglContext->DoneCurrent();
    oglContext = nullptr;

    lastScreenWidth = lastScreenHeight = -1;
}

void EmuThread::run()
{
    u32 mainScreenPos[3];
    Platform::FileHandle* file;

    UpdateConsole(nullptr, nullptr);
    // No carts are inserted when melonDS first boots

    mainScreenPos[0] = 0;
    mainScreenPos[1] = 0;
    mainScreenPos[2] = 0;
    autoScreenSizing = 0;

    videoSettingsDirty = false;

    if (mainWindow->hasOGL)
    {
        initOpenGL();
        videoRenderer = Config::_3DRenderer;
    }
    else
    {
        videoRenderer = 0;
    }

    if (videoRenderer == 0)
    { // If we're using the software renderer...
        NDS->GPU.SetRenderer3D(std::make_unique<SoftRenderer>(Config::Threaded3D != 0));
    }
    else
    {
        auto glrenderer =  melonDS::GLRenderer::New();
        glrenderer->SetRenderSettings(Config::GL_BetterPolygons, Config::GL_ScaleFactor);
        NDS->GPU.SetRenderer3D(std::move(glrenderer));
    }

    Input::Init();

    u32 nframes = 0;
    double perfCountsSec = 1.0 / SDL_GetPerformanceFrequency();
    double lastTime = SDL_GetPerformanceCounter() * perfCountsSec;
    double frameLimitError = 0.0;
    double lastMeasureTime = lastTime;

    u32 winUpdateCount = 0, winUpdateFreq = 1;
    u8 dsiVolumeLevel = 0x1F;

    file = Platform::OpenLocalFile("rtc.bin", Platform::FileMode::Read);
    if (file)
    {
        RTC::StateData state;
        Platform::FileRead(&state, sizeof(state), 1, file);
        Platform::CloseFile(file);
        NDS->RTC.SetState(state);
    }

    char melontitle[100];

    while (EmuRunning != emuStatus_Exit)
    {
        Input::Process();

        if (Input::HotkeyPressed(HK_FastForwardToggle)) emit windowLimitFPSChange();

        if (Input::HotkeyPressed(HK_Pause)) emit windowEmuPause();
        if (Input::HotkeyPressed(HK_Reset)) emit windowEmuReset();
        if (Input::HotkeyPressed(HK_FrameStep)) emit windowEmuFrameStep();

        if (Input::HotkeyPressed(HK_FullscreenToggle)) emit windowFullscreenToggle();

        if (Input::HotkeyPressed(HK_SwapScreens)) emit swapScreensToggle();
        if (Input::HotkeyPressed(HK_SwapScreenEmphasis)) emit screenEmphasisToggle();

        if (EmuRunning == emuStatus_Running || EmuRunning == emuStatus_FrameStep)
        {
            EmuStatus = emuStatus_Running;
            if (EmuRunning == emuStatus_FrameStep) EmuRunning = emuStatus_Paused;

            if (Input::HotkeyPressed(HK_SolarSensorDecrease))
            {
                int level = NDS->GBACartSlot.SetInput(GBACart::Input_SolarSensorDown, true);
                if (level != -1)
                {
                    char msg[64];
                    sprintf(msg, "Solar sensor level: %d", level);
                    OSD::AddMessage(0, msg);
                }
            }
            if (Input::HotkeyPressed(HK_SolarSensorIncrease))
            {
                int level = NDS->GBACartSlot.SetInput(GBACart::Input_SolarSensorUp, true);
                if (level != -1)
                {
                    char msg[64];
                    sprintf(msg, "Solar sensor level: %d", level);
                    OSD::AddMessage(0, msg);
                }
            }

            if (NDS->ConsoleType == 1)
            {
                DSi& dsi = static_cast<DSi&>(*NDS);
                double currentTime = SDL_GetPerformanceCounter() * perfCountsSec;

                // Handle power button
                if (Input::HotkeyDown(HK_PowerButton))
                {
                    dsi.I2C.GetBPTWL()->SetPowerButtonHeld(currentTime);
                }
                else if (Input::HotkeyReleased(HK_PowerButton))
                {
                    dsi.I2C.GetBPTWL()->SetPowerButtonReleased(currentTime);
                }

                // Handle volume buttons
                if (Input::HotkeyDown(HK_VolumeUp))
                {
                    dsi.I2C.GetBPTWL()->SetVolumeSwitchHeld(DSi_BPTWL::volumeKey_Up);
                }
                else if (Input::HotkeyReleased(HK_VolumeUp))
                {
                    dsi.I2C.GetBPTWL()->SetVolumeSwitchReleased(DSi_BPTWL::volumeKey_Up);
                }

                if (Input::HotkeyDown(HK_VolumeDown))
                {
                    dsi.I2C.GetBPTWL()->SetVolumeSwitchHeld(DSi_BPTWL::volumeKey_Down);
                }
                else if (Input::HotkeyReleased(HK_VolumeDown))
                {
                    dsi.I2C.GetBPTWL()->SetVolumeSwitchReleased(DSi_BPTWL::volumeKey_Down);
                }

                dsi.I2C.GetBPTWL()->ProcessVolumeSwitchInput(currentTime);
            }

            // update render settings if needed
            // HACK:
            // once the fast forward hotkey is released, we need to update vsync
            // to the old setting again
            if (videoSettingsDirty || Input::HotkeyReleased(HK_FastForward))
            {
                if (oglContext)
                {
                    oglContext->SetSwapInterval(Config::ScreenVSync ? Config::ScreenVSyncInterval : 0);
                    videoRenderer = Config::_3DRenderer;
                }
#ifdef OGLRENDERER_ENABLED
                else
#endif
                {
                    videoRenderer = 0;
                }

                videoRenderer = oglContext ? Config::_3DRenderer : 0;

                videoSettingsDirty = false;

                if (videoRenderer == 0)
                { // If we're using the software renderer...
                    NDS->GPU.SetRenderer3D(std::make_unique<SoftRenderer>(Config::Threaded3D != 0));
                }
                else
                {
                    auto glrenderer =  melonDS::GLRenderer::New();
                    glrenderer->SetRenderSettings(Config::GL_BetterPolygons, Config::GL_ScaleFactor);
                    NDS->GPU.SetRenderer3D(std::move(glrenderer));
                }
            }

            // process input and hotkeys
            NDS->SetKeyMask(Input::InputMask);

            if (Input::HotkeyPressed(HK_Lid))
            {
                bool lid = !NDS->IsLidClosed();
                NDS->SetLidClosed(lid);
                OSD::AddMessage(0, lid ? "Lid closed" : "Lid opened");
            }

            // microphone input
            AudioInOut::MicProcess(*NDS);

            // auto screen layout
            if (Config::ScreenSizing == Frontend::screenSizing_Auto)
            {
                mainScreenPos[2] = mainScreenPos[1];
                mainScreenPos[1] = mainScreenPos[0];
                mainScreenPos[0] = NDS->PowerControl9 >> 15;

                int guess;
                if (mainScreenPos[0] == mainScreenPos[2] &&
                    mainScreenPos[0] != mainScreenPos[1])
                {
                    // constant flickering, likely displaying 3D on both screens
                    // TODO: when both screens are used for 2D only...???
                    guess = Frontend::screenSizing_Even;
                }
                else
                {
                    if (mainScreenPos[0] == 1)
                        guess = Frontend::screenSizing_EmphTop;
                    else
                        guess = Frontend::screenSizing_EmphBot;
                }

                if (guess != autoScreenSizing)
                {
                    autoScreenSizing = guess;
                    emit screenLayoutChange();
                }
            }


            // emulate
            u32 nlines = NDS->RunFrame();

            if (ROMManager::NDSSave)
                ROMManager::NDSSave->CheckFlush();

            if (ROMManager::GBASave)
                ROMManager::GBASave->CheckFlush();

            if (ROMManager::FirmwareSave)
                ROMManager::FirmwareSave->CheckFlush();

            if (!oglContext)
            {
                FrontBufferLock.lock();
                FrontBuffer = NDS->GPU.FrontBuffer;
                FrontBufferLock.unlock();
            }
            else
            {
                FrontBuffer = NDS->GPU.FrontBuffer;
                drawScreenGL();
            }

#ifdef MELONCAP
            MelonCap::Update();
#endif // MELONCAP

            if (EmuRunning == emuStatus_Exit) break;

            winUpdateCount++;
            if (winUpdateCount >= winUpdateFreq && !oglContext)
            {
                emit windowUpdate();
                winUpdateCount = 0;
            }

            bool fastforward = Input::HotkeyDown(HK_FastForward);

            if (fastforward && oglContext && Config::ScreenVSync)
            {
                oglContext->SetSwapInterval(0);
            }

            if (Config::DSiVolumeSync && NDS->ConsoleType == 1)
            {
                DSi& dsi = static_cast<DSi&>(*NDS);
                u8 volumeLevel = dsi.I2C.GetBPTWL()->GetVolumeLevel();
                if (volumeLevel != dsiVolumeLevel)
                {
                    dsiVolumeLevel = volumeLevel;
                    emit syncVolumeLevel();
                }

                Config::AudioVolume = volumeLevel * (256.0 / 31.0);
            }

            if (Config::AudioSync && !fastforward)
                AudioInOut::AudioSync(*emuThread->NDS);

            double frametimeStep = nlines / (60.0 * 263.0);

            {
                bool limitfps = Config::LimitFPS && !fastforward;

                double practicalFramelimit = limitfps ? frametimeStep : 1.0 / 1000.0;

                double curtime = SDL_GetPerformanceCounter() * perfCountsSec;

                frameLimitError += practicalFramelimit - (curtime - lastTime);
                if (frameLimitError < -practicalFramelimit)
                    frameLimitError = -practicalFramelimit;
                if (frameLimitError > practicalFramelimit)
                    frameLimitError = practicalFramelimit;

                if (round(frameLimitError * 1000.0) > 0.0)
                {
                    SDL_Delay(round(frameLimitError * 1000.0));
                    double timeBeforeSleep = curtime;
                    curtime = SDL_GetPerformanceCounter() * perfCountsSec;
                    frameLimitError -= curtime - timeBeforeSleep;
                }

                lastTime = curtime;
            }

            nframes++;
            if (nframes >= 30)
            {
                double time = SDL_GetPerformanceCounter() * perfCountsSec;
                double dt = time - lastMeasureTime;
                lastMeasureTime = time;

                u32 fps = round(nframes / dt);
                nframes = 0;

                float fpstarget = 1.0/frametimeStep;

                winUpdateFreq = fps / (u32)round(fpstarget);
                if (winUpdateFreq < 1)
                    winUpdateFreq = 1;

                int inst = Platform::InstanceID();
                if (inst == 0)
                    sprintf(melontitle, "[%d/%.0f] melonDS " MELONDS_VERSION, fps, fpstarget);
                else
                    sprintf(melontitle, "[%d/%.0f] melonDS (%d)", fps, fpstarget, inst+1);
                changeWindowTitle(melontitle);
            }
        }
        else
        {
            // paused
            nframes = 0;
            lastTime = SDL_GetPerformanceCounter() * perfCountsSec;
            lastMeasureTime = lastTime;

            emit windowUpdate();

            EmuStatus = EmuRunning;

            int inst = Platform::InstanceID();
            if (inst == 0)
                sprintf(melontitle, "melonDS " MELONDS_VERSION);
            else
                sprintf(melontitle, "melonDS (%d)", inst+1);
            changeWindowTitle(melontitle);

            SDL_Delay(75);

            if (oglContext)
                drawScreenGL();

            ContextRequestKind contextRequest = ContextRequest;
            if (contextRequest == contextRequest_InitGL)
            {
                initOpenGL();
                ContextRequest = contextRequest_None;
            }
            else if (contextRequest == contextRequest_DeInitGL)
            {
                deinitOpenGL();
                ContextRequest = contextRequest_None;
            }
        }
    }

    file = Platform::OpenLocalFile("rtc.bin", Platform::FileMode::Write);
    if (file)
    {
        RTC::StateData state;
        NDS->RTC.GetState(state);
        Platform::FileWrite(&state, sizeof(state), 1, file);
        Platform::CloseFile(file);
    }

    EmuStatus = emuStatus_Exit;

    NDS::Current = nullptr;
    // nds is out of scope, so unique_ptr cleans it up for us
}

void EmuThread::changeWindowTitle(char* title)
{
    emit windowTitleChange(QString(title));
}

void EmuThread::emuRun()
{
    EmuRunning = emuStatus_Running;
    EmuPauseStack = EmuPauseStackRunning;
    RunningSomething = true;

    // checkme
    emit windowEmuStart();
    AudioInOut::Enable();
}

void EmuThread::initContext()
{
    ContextRequest = contextRequest_InitGL;
    while (ContextRequest != contextRequest_None);
}

void EmuThread::deinitContext()
{
    ContextRequest = contextRequest_DeInitGL;
    while (ContextRequest != contextRequest_None);
}

void EmuThread::emuPause()
{
    EmuPauseStack++;
    if (EmuPauseStack > EmuPauseStackPauseThreshold) return;

    PrevEmuStatus = EmuRunning;
    EmuRunning = emuStatus_Paused;
    while (EmuStatus != emuStatus_Paused);

    AudioInOut::Disable();
}

void EmuThread::emuUnpause()
{
    if (EmuPauseStack < EmuPauseStackPauseThreshold) return;

    EmuPauseStack--;
    if (EmuPauseStack >= EmuPauseStackPauseThreshold) return;

    EmuRunning = PrevEmuStatus;

    AudioInOut::Enable();
}

void EmuThread::emuStop()
{
    EmuRunning = emuStatus_Exit;
    EmuPauseStack = EmuPauseStackRunning;

    AudioInOut::Disable();
}

void EmuThread::emuFrameStep()
{
    if (EmuPauseStack < EmuPauseStackPauseThreshold) emit windowEmuPause();
    EmuRunning = emuStatus_FrameStep;
}

bool EmuThread::emuIsRunning()
{
    return EmuRunning == emuStatus_Running;
}

bool EmuThread::emuIsActive()
{
    return (RunningSomething == 1);
}

void EmuThread::drawScreenGL()
{
    if (!NDS) return;
    int w = windowInfo.surface_width;
    int h = windowInfo.surface_height;
    float factor = windowInfo.surface_scale;

    glBindFramebuffer(GL_FRAMEBUFFER, 0);
    glDisable(GL_DEPTH_TEST);
    glDepthMask(false);
    glDisable(GL_BLEND);
    glDisable(GL_SCISSOR_TEST);
    glDisable(GL_STENCIL_TEST);
    glClear(GL_COLOR_BUFFER_BIT);

    glViewport(0, 0, w, h);

    glUseProgram(screenShaderProgram[2]);
    glUniform2f(screenShaderScreenSizeULoc, w / factor, h / factor);

    int frontbuf = FrontBuffer;
    glActiveTexture(GL_TEXTURE0);

#ifdef OGLRENDERER_ENABLED
    if (NDS->GPU.GetRenderer3D().Accelerated)
    {
        // hardware-accelerated render
        static_cast<GLRenderer&>(NDS->GPU.GetRenderer3D()).GetCompositor().BindOutputTexture(frontbuf);
    }
    else
#endif
    {
        // regular render
        glBindTexture(GL_TEXTURE_2D, screenTexture);

        if (NDS->GPU.Framebuffer[frontbuf][0] && NDS->GPU.Framebuffer[frontbuf][1])
        {
            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 256, 192, GL_RGBA,
                            GL_UNSIGNED_BYTE, NDS->GPU.Framebuffer[frontbuf][0].get());
            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 192+2, 256, 192, GL_RGBA,
                            GL_UNSIGNED_BYTE, NDS->GPU.Framebuffer[frontbuf][1].get());
        }
    }

    screenSettingsLock.lock();

    GLint filter = this->filter ? GL_LINEAR : GL_NEAREST;
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter);

    glBindBuffer(GL_ARRAY_BUFFER, screenVertexBuffer);
    glBindVertexArray(screenVertexArray);

    for (int i = 0; i < numScreens; i++)
    {
        glUniformMatrix2x3fv(screenShaderTransformULoc, 1, GL_TRUE, screenMatrix[i]);
        glDrawArrays(GL_TRIANGLES, screenKind[i] == 0 ? 0 : 2*3, 2*3);
    }

    screenSettingsLock.unlock();

    OSD::Update();
    OSD::DrawGL(w, h);

    oglContext->SwapBuffers();
}




static bool FileExtensionInList(const QString& filename, const QStringList& extensions, Qt::CaseSensitivity cs = Qt::CaseInsensitive)
{
    return std::any_of(extensions.cbegin(), extensions.cend(), [&](const auto& ext) {
        return filename.endsWith(ext, cs);
    });
}

static bool MimeTypeInList(const QMimeType& mimetype, const QStringList& superTypeNames)
{
    return std::any_of(superTypeNames.cbegin(), superTypeNames.cend(), [&](const auto& superTypeName) {
        return mimetype.inherits(superTypeName);
    });
}


static bool NdsRomByExtension(const QString& filename)
{
    return FileExtensionInList(filename, NdsRomExtensions);
}

static bool GbaRomByExtension(const QString& filename)
{
    return FileExtensionInList(filename, GbaRomExtensions);
}

static bool SupportedArchiveByExtension(const QString& filename)
{
    return FileExtensionInList(filename, ArchiveExtensions);
}


static bool NdsRomByMimetype(const QMimeType& mimetype)
{
    return mimetype.inherits(NdsRomMimeType);
}

static bool GbaRomByMimetype(const QMimeType& mimetype)
{
    return mimetype.inherits(GbaRomMimeType);
}

static bool SupportedArchiveByMimetype(const QMimeType& mimetype)
{
    return MimeTypeInList(mimetype, ArchiveMimeTypes);
}

static bool ZstdNdsRomByExtension(const QString& filename)
{
    return filename.endsWith(".zst", Qt::CaseInsensitive) &&
        NdsRomByExtension(filename.left(filename.size() - 4));
}

static bool ZstdGbaRomByExtension(const QString& filename)
{
    return filename.endsWith(".zst", Qt::CaseInsensitive) &&
        GbaRomByExtension(filename.left(filename.size() - 4));
}

static bool FileIsSupportedFiletype(const QString& filename, bool insideArchive = false)
{
    if (ZstdNdsRomByExtension(filename) || ZstdGbaRomByExtension(filename))
        return true;

    if (NdsRomByExtension(filename) || GbaRomByExtension(filename) || SupportedArchiveByExtension(filename))
        return true;

    const auto matchmode = insideArchive ? QMimeDatabase::MatchExtension : QMimeDatabase::MatchDefault;
    const QMimeType mimetype = QMimeDatabase().mimeTypeForFile(filename, matchmode);
    return NdsRomByMimetype(mimetype) || GbaRomByMimetype(mimetype) || SupportedArchiveByMimetype(mimetype);
}





void emuStop()
{
    RunningSomething = false;

    emit emuThread->windowEmuStop();
}

MelonApplication::MelonApplication(int& argc, char** argv)
    : QApplication(argc, argv)
{
#if !defined(Q_OS_APPLE)
    setWindowIcon(QIcon(":/melon-icon"));
    #if defined(Q_OS_UNIX)
        setDesktopFileName(QString("net.kuribo64.melonDS"));
    #endif
#endif
}

bool MelonApplication::event(QEvent *event)
{
    if (event->type() == QEvent::FileOpen)
    {
        QFileOpenEvent *openEvent = static_cast<QFileOpenEvent*>(event);

        emuThread->emuPause();
        const QStringList file = mainWindow->splitArchivePath(openEvent->file(), true);
        if (!mainWindow->preloadROMs(file, {}, true))
            emuThread->emuUnpause();
    }

    return QApplication::event(event);
}

int main(int argc, char** argv)
{
    srand(time(nullptr));

    qputenv("QT_SCALE_FACTOR", "1");

    printf("melonDS " MELONDS_VERSION "\n");
    printf(MELONDS_URL "\n");

    // easter egg - not worth checking other cases for something so dumb
    if (argc != 0 && (!strcasecmp(argv[0], "derpDS") || !strcasecmp(argv[0], "./derpDS")))
        printf("did you just call me a derp???\n");

    Platform::Init(argc, argv);

    MelonApplication melon(argc, argv);

    CLI::CommandLineOptions* options = CLI::ManageArgs(melon);

    // http://stackoverflow.com/questions/14543333/joystick-wont-work-using-sdl
    SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");

    if (SDL_Init(SDL_INIT_HAPTIC) < 0)
    {
        printf("SDL couldn't init rumble\n");
    }
    if (SDL_Init(SDL_INIT_JOYSTICK) < 0)
    {
        printf("SDL couldn't init joystick\n");
    }
    if (SDL_Init(SDL_INIT_AUDIO) < 0)
    {
        const char* err = SDL_GetError();
        QString errorStr = "Failed to initialize SDL. This could indicate an issue with your audio driver.\n\nThe error was: ";
        errorStr += err;

        QMessageBox::critical(NULL, "melonDS", errorStr);
        return 1;
    }

    SDL_JoystickEventState(SDL_ENABLE);

    SDL_InitSubSystem(SDL_INIT_VIDEO);
    SDL_EnableScreenSaver(); SDL_DisableScreenSaver();

    Config::Load();

#define SANITIZE(var, min, max)  { var = std::clamp(var, min, max); }
    SANITIZE(Config::ConsoleType, 0, 1);
#ifdef OGLRENDERER_ENABLED
    SANITIZE(Config::_3DRenderer, 0, 1); // 0 is the software renderer, 1 is the OpenGL renderer
#else
    SANITIZE(Config::_3DRenderer, 0, 0);
#endif
    SANITIZE(Config::ScreenVSyncInterval, 1, 20);
    SANITIZE(Config::GL_ScaleFactor, 1, 16);
    SANITIZE(Config::AudioInterp, 0, 3);
    SANITIZE(Config::AudioVolume, 0, 256);
    SANITIZE(Config::MicInputType, 0, (int)micInputType_MAX);
    SANITIZE(Config::ScreenRotation, 0, (int)Frontend::screenRot_MAX);
    SANITIZE(Config::ScreenGap, 0, 500);
    SANITIZE(Config::ScreenLayout, 0, (int)Frontend::screenLayout_MAX);
    SANITIZE(Config::ScreenSizing, 0, (int)Frontend::screenSizing_MAX);
    SANITIZE(Config::ScreenAspectTop, 0, AspectRatiosNum);
    SANITIZE(Config::ScreenAspectBot, 0, AspectRatiosNum);
#undef SANITIZE

    camStarted[0] = false;
    camStarted[1] = false;
    camManager[0] = new CameraManager(0, 640, 480, true);
    camManager[1] = new CameraManager(1, 640, 480, true);
    camManager[0]->setXFlip(Config::Camera[0].XFlip);
    camManager[1]->setXFlip(Config::Camera[1].XFlip);


    Input::JoystickID = Config::JoystickID;
    Input::OpenJoystick();

    mainWindow = new MainWindow();
    if (options->fullscreen)
        ToggleFullscreen(mainWindow);

    emuThread = new EmuThread();
    emuThread->start();
    emuThread->emuPause();

    AudioInOut::Init(emuThread);
    ROMManager::EnableCheats(*emuThread->NDS, Config::EnableCheats != 0);
    AudioInOut::AudioMute(mainWindow);

    QObject::connect(&melon, &QApplication::applicationStateChanged, mainWindow, &MainWindow::onAppStateChanged);

    bool memberSyntaxUsed = false;
    const auto prepareRomPath = [&](const std::optional<QString>& romPath, const std::optional<QString>& romArchivePath) -> QStringList
    {
        if (!romPath.has_value())
            return {};

        if (romArchivePath.has_value())
            return { *romPath, *romArchivePath };

        const QStringList path = mainWindow->splitArchivePath(*romPath, true);
        if (path.size() > 1) memberSyntaxUsed = true;
        return path;
    };

    const QStringList dsfile = prepareRomPath(options->dsRomPath, options->dsRomArchivePath);
    const QStringList gbafile = prepareRomPath(options->gbaRomPath, options->gbaRomArchivePath);

    if (memberSyntaxUsed) printf("Warning: use the a.zip|b.nds format at your own risk!\n");

    mainWindow->preloadROMs(dsfile, gbafile, options->boot);

    int ret = melon.exec();

    delete options;

    emuThread->emuStop();
    emuThread->wait();
    delete emuThread;

    Input::CloseJoystick();

    AudioInOut::DeInit();
    delete camManager[0];
    delete camManager[1];

    Config::Save();

    SDL_Quit();
    Platform::DeInit();
    return ret;
}

#ifdef __WIN32__

#include <windows.h>

int CALLBACK WinMain(HINSTANCE hinst, HINSTANCE hprev, LPSTR cmdline, int cmdshow)
{
    int ret = main(__argc, __argv);

    printf("\n\n>");

    return ret;
}

#endif