// SPDX-FileCopyrightText: 2018 Citra Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#include "common/logging/log.h"
#include "common/math_util.h"
#include "common/param_package.h"
#include "common/settings.h"
#include "common/thread.h"
#include "common/vector_math.h"
#include "input_common/drivers/sdl_driver.h"

namespace InputCommon {

namespace {
Common::UUID GetGUID(SDL_Joystick* joystick) {
    const SDL_JoystickGUID guid = SDL_JoystickGetGUID(joystick);
    std::array<u8, 16> data{};
    std::memcpy(data.data(), guid.data, sizeof(data));
    // Clear controller name crc
    std::memset(data.data() + 2, 0, sizeof(u16));
    return Common::UUID{data};
}
} // Anonymous namespace

static int SDLEventWatcher(void* user_data, SDL_Event* event) {
    auto* const sdl_state = static_cast<SDLDriver*>(user_data);
    sdl_state->HandleGameControllerEvent(*event);
    return 0;
}

SDLDriver::SDLDriver(std::string input_engine_) : InputEngine(std::move(input_engine_)) {
    if (!Settings::values.enable_raw_input) {
        // Disable raw input. When enabled this setting causes SDL to die when a web applet opens
        SDL_SetHint(SDL_HINT_JOYSTICK_RAWINPUT, "0");
    }

    // Prevent SDL from adding undesired axis
    SDL_SetHint(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, "0");

    // Enable HIDAPI rumble. This prevents SDL from disabling motion on PS4 and PS5 controllers
    SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_PS4_RUMBLE, "1");
    SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_PS5_RUMBLE, "1");
    SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");

    // Use hidapi driver for joycons. This will allow joycons to be detected as a GameController and
    // not a generic one
    SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_JOY_CONS, "1");
    SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_SWITCH, "1");

    // Disable hidapi driver for xbox. Already default on Windows, this causes conflict with native
    // driver on Linux.
    SDL_SetHint(SDL_HINT_JOYSTICK_HIDAPI_XBOX, "0");

    // If the frontend is going to manage the event loop, then we don't start one here
    const auto start_thread = SDL_WasInit(SDL_INIT_JOYSTICK | SDL_INIT_GAMECONTROLLER) == 0;
    if (start_thread && SDL_Init(SDL_INIT_JOYSTICK | SDL_INIT_GAMECONTROLLER) < 0) {
        LOG_CRITICAL(Input, "SDL_Init failed with: {}", SDL_GetError());
        return;
    }

    SDL_AddEventWatch(&SDLEventWatcher, this);

    initialized = true;

    if (start_thread) {
        vibration_thread = std::thread([this] {
            Common::SetCurrentThreadName("SDL_Vibration");
            using namespace std::chrono_literals;
            while (initialized) {
                SendVibrations();
                std::this_thread::sleep_for(10ms);
            }
        });
    }

    // Because the events for joystick connection happens before we have our event watcher added, we
    // can just open all the joysticks right here
    for (int i = 0; i < SDL_NumJoysticks(); ++i) {
        InitJoystick(i);
    }
}

SDLDriver::~SDLDriver() {
    CloseJoysticks();
    SDL_DelEventWatch(&SDLEventWatcher, this);

    if (initialized) {
        vibration_thread.join();
        SDL_QuitSubSystem(SDL_INIT_JOYSTICK | SDL_INIT_GAMECONTROLLER);
    }

    initialized = false;
}

void SDLDriver::InitJoystick(int joystick_index) {
    SDL_Joystick* sdl_joystick = SDL_JoystickOpen(joystick_index);
    SDL_GameController* sdl_gamecontroller = nullptr;

    if (SDL_IsGameController(joystick_index)) {
        sdl_gamecontroller = SDL_GameControllerOpen(joystick_index);
    }

    if (!sdl_joystick) {
        LOG_ERROR(Input, "Failed to open joystick {}", joystick_index);
        return;
    }

    const auto guid = GetGUID(sdl_joystick);
}

void SDLDriver::CloseJoystick(SDL_Joystick* sdl_joystick) {
    const auto guid = GetGUID(sdl_joystick);
}

void SDLDriver::CloseJoysticks() {
    std::scoped_lock lock{joystick_map_mutex};
}

void SDLDriver::PumpEvents() const {
    if (initialized) {
        SDL_PumpEvents();
    }
}

void SDLDriver::HandleGameControllerEvent(const SDL_Event& event) {
    switch (event.type) {
    case SDL_JOYBUTTONUP: {
        break;
    }
    case SDL_JOYBUTTONDOWN: {
        break;
    }
    case SDL_JOYHATMOTION: {
        break;
    }
    case SDL_JOYAXISMOTION: {
        break;
    }
    case SDL_CONTROLLERSENSORUPDATE: {
        break;
    }
    case SDL_JOYDEVICEREMOVED:
        LOG_DEBUG(Input, "Controller removed with Instance_ID {}", event.jdevice.which);
        CloseJoystick(SDL_JoystickFromInstanceID(event.jdevice.which));
        break;
    case SDL_JOYDEVICEADDED:
        LOG_DEBUG(Input, "Controller connected with device index {}", event.jdevice.which);
        InitJoystick(event.jdevice.which);
        break;
    }
}

bool SDLDriver::IsStickInverted(const Common::ParamPackage& params) {
    if (!params.Has("guid") || !params.Has("port")) {
        return false;
    }
    return true;
}

bool SDLDriver::IsVibrationEnabled(const PadIdentifier& identifier) {
    return true;
}

Common::Input::VibrationError SDLDriver::SetVibration(
    const PadIdentifier& identifier, const Common::Input::VibrationStatus& vibration) {
    return Common::Input::VibrationError::None;
}


void SDLDriver::SendVibrations() {
    std::vector<VibrationRequest> filtered_vibrations{};
    while (!vibration_queue.Empty()) {
        VibrationRequest request;
        vibration_queue.Pop(request);
    }
}

std::vector<Common::ParamPackage> SDLDriver::GetInputDevices() const {
    std::vector<Common::ParamPackage> devices;
    return devices;
}

ButtonMapping SDLDriver::GetButtonMappingForDevice(const Common::ParamPackage& params) {
    if (!params.Has("guid") || !params.Has("port")) {
        return {};
    }

    return {};
}

AnalogMapping SDLDriver::GetAnalogMappingForDevice(const Common::ParamPackage& params) {
    if (!params.Has("guid") || !params.Has("port")) {
        return {};
    }
    return {};
}

MotionMapping SDLDriver::GetMotionMappingForDevice(const Common::ParamPackage& params) {
    if (!params.Has("guid") || !params.Has("port")) {
        return {};
    }
    return {};
}

Common::Input::ButtonNames SDLDriver::GetUIName(const Common::ParamPackage& params) const {
    if (params.Has("button")) {
        // TODO(German77): Find how to substitute the values for real button names
        return Common::Input::ButtonNames::Value;
    }
    if (params.Has("hat")) {
        return Common::Input::ButtonNames::Value;
    }
    if (params.Has("axis")) {
        return Common::Input::ButtonNames::Value;
    }
    if (params.Has("axis_x") && params.Has("axis_y") && params.Has("axis_z")) {
        return Common::Input::ButtonNames::Value;
    }
    if (params.Has("motion")) {
        return Common::Input::ButtonNames::Engine;
    }

    return Common::Input::ButtonNames::Invalid;
}

std::string SDLDriver::GetHatButtonName(u8 direction_value) const {
    switch (direction_value) {
    case SDL_HAT_UP:
        return "up";
    case SDL_HAT_DOWN:
        return "down";
    case SDL_HAT_LEFT:
        return "left";
    case SDL_HAT_RIGHT:
        return "right";
    default:
        return {};
    }
}

u8 SDLDriver::GetHatButtonId(const std::string& direction_name) const {
    Uint8 direction;
    if (direction_name == "up") {
        direction = SDL_HAT_UP;
    } else if (direction_name == "down") {
        direction = SDL_HAT_DOWN;
    } else if (direction_name == "left") {
        direction = SDL_HAT_LEFT;
    } else if (direction_name == "right") {
        direction = SDL_HAT_RIGHT;
    } else {
        direction = 0;
    }
    return direction;
}

} // namespace InputCommon