#include <@APP_INCLUDE@>
#include <engine.hpp>

#include "gfx_vulkan.hpp"
#include "platform.hpp"

#include <SDL2/SDL.h>
#include <SDL2/SDL_vulkan.h>

@APP_CLASS@* app = nullptr;
GFX* interface = nullptr;

struct Window {
    int identifier = 0;
    SDL_Window* window = nullptr;
};

std::vector<Window> windows;

static std::map<InputButton, int> inputToKeyCode = { {
    {InputButton::A, 38},
    {InputButton::W, 25},
    {InputButton::S, 39},
    {InputButton::D, 40},
    {InputButton::Q, 24}
}};

/*
 * Platform functions"
 */

const char* platform::get_name() {
    return "Linux (SDL)";
}

bool platform::supports_feature(const PlatformFeature feature) {
    if(feature == PlatformFeature::Windowing)
        return true;

    return false;
}

int platform::open_window(const std::string_view title, const prism::Rectangle rect, const WindowFlags flags) {
    auto& win = windows.emplace_back();
    win.identifier = windows.size() - 1;

    win.window = SDL_CreateWindow(title.data(), rect.offset.x, rect.offset.y, rect.extent.width, rect.extent.height, SDL_WINDOW_VULKAN);

    engine->add_window((void*)&win, 0, rect.extent);
    app->initialize_render();

    return win.identifier;
}

void platform::close_window(const int index) {
}

void platform::force_quit() {
}

float platform::get_window_dpi(const int index) {
    return 1.0;
}

float platform::get_monitor_dpi() {
    return 1.0;
}

prism::Rectangle platform::get_monitor_resolution() {
    return {};
}

prism::Rectangle platform::get_monitor_work_area() {
    return platform::get_monitor_resolution();
}

Window* get_window(const int index) {
    for(auto& window : windows) {
        if(window.identifier == index)
            return &window;
    }

    return nullptr;
}

prism::Offset platform::get_window_position(const int index) {
}

prism::Extent platform::get_window_size(const int index) {
    auto window = get_window(index);

    int width, height;
    SDL_GetWindowSize(window->window, &width, &height);

    return {(uint32_t)width, (uint32_t)height};
}

prism::Extent platform::get_window_drawable_size(const int index) {
    auto window = get_window(index);

    int width, height;
    SDL_GetWindowSize(window->window, &width, &height);

    return {(uint32_t)width, (uint32_t)height};
}

bool platform::is_window_focused(const int index) {
}

void platform::set_window_focused(const int index) {
}

void platform::set_window_position(const int index, const prism::Offset offset) {
}

void platform::set_window_size(const int index, const prism::Extent extent) {
}

void platform::set_window_title(const int index, const std::string_view title) {
    auto window = get_window(index);

    SDL_SetWindowTitle(window->window, title.data());
}

bool platform::get_key_down(const InputButton key) {
    return false;
}

int platform::get_keycode(const InputButton key) {
    return inputToKeyCode[key];
}

prism::Offset platform::get_cursor_position() {
    return {0, 0};
}

prism::Offset platform::get_screen_cursor_position() {
    return {0, 0};
}

bool platform::get_mouse_button_down(const int button) {
    return false;
}

std::tuple<float, float> platform::get_wheel_delta() {
}

std::tuple<float, float> platform::get_right_stick_position() {
}

std::tuple<float, float> platform::get_left_stick_position() {
}

void platform::capture_mouse(const bool capture) {
}

void platform::open_dialog(const bool existing, std::function<void(std::string)> returnFunction, bool openDirectory) {
}

void platform::save_dialog(std::function<void(std::string)> returnFunction) {
}

char* platform::translate_keycode(const unsigned int keycode) {
    return "";
}

int stdout_copy;
int stderr_copy;

void platform::mute_output() {

}

void platform::unmute_output() {

}

int main(int argc, char* argv[]) {
    SDL_Init(SDL_INIT_VIDEO);

    engine = new prism::Engine(argc, argv);

    app = new @APP_CLASS@();
    engine->set_app(app);

    GFXCreateInfo info = {};

    interface = new GFXVulkan();
    if(interface->initialize(info)) {
        engine->set_gfx(interface);
    } else {
        return -1;
    }

    app_main(engine);

    while(1) {
         SDL_Event event = {};
         while(SDL_PollEvent(&event)) {

         }

         if(engine->is_quitting())
             break;

         engine->update(1.0 / 60.0);
         engine->begin_frame(1.0 / 60.0);
         engine->render(0);

         engine->end_frame();
     }

  return 0;
}

PlatformTheme platform::get_theme() {
    return PlatformTheme::Light;
}

void* platform::create_native_surface(int index, void* instance) {
    auto window = get_window(index);

    VkSurfaceKHR surface;

    SDL_Vulkan_CreateSurface(window->window, (VkInstance)instance, &surface);

    return surface;
}

std::vector<const char*> platform::get_native_surface_extension() {
    // dummy window
    auto dummy = SDL_CreateWindow("", 0, 0, 1, 1, SDL_WINDOW_VULKAN);

    unsigned int count = 0;
    SDL_Vulkan_GetInstanceExtensions(dummy, &count, nullptr);

    std::vector<const char*> extensions(count);
    SDL_Vulkan_GetInstanceExtensions(dummy, &count, extensions.data());

    SDL_DestroyWindow(dummy);

    return extensions;
}