#include <cstdlib>
#include <nng/nng.h>

#include <imgui.h>
#include <backends/imgui_impl_sdl.h>
#include <backends/imgui_impl_sdlrenderer.h>
#include <SDL.h>

#include "dp_common.h"

void dp_sdl_fatal(const char *const msg)
{
    log_fatal("%s: %s", msg, SDL_GetError());
    abort();
}

struct ControllerContext
{
    nng_socket pub;
    nng_socket sub;
    SDL_Window *window;
    SDL_Renderer *renderer;
};

int doom_controller_loop(ControllerContext *ctx)
{
    static constexpr ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);

    bool done = false;

    while (!done)
    {
        SDL_Event event;
        while (SDL_PollEvent(&event))
        {
            ImGui_ImplSDL2_ProcessEvent(&event);

            if (event.type == SDL_QUIT)
                done = true;

            if (event.type == SDL_WINDOWEVENT
                && event.window.event == SDL_WINDOWEVENT_CLOSE
                && event.window.windowID == SDL_GetWindowID(ctx->window))
            {
                done = true;
            }
        }

        // Start the Dear ImGui frame
        ImGui_ImplSDLRenderer_NewFrame();
        ImGui_ImplSDL2_NewFrame();
        ImGui::NewFrame();

        // Rendering
        ImGui::Render();
        SDL_SetRenderDrawColor(ctx->renderer,
            (u8)(clear_color.x * 255), (u8)(clear_color.y * 255), (u8)(clear_color.z * 255), (u8)(clear_color.w * 255));
        SDL_RenderClear(ctx->renderer);
        ImGui_ImplSDLRenderer_RenderDrawData(ImGui::GetDrawData());
        SDL_RenderPresent(ctx->renderer);
    }

    return 0;
}

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

    log_info("doompanning ctrl starting");

    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER))
        dp_sdl_fatal("SDL_Init");

#ifdef SDL_HINT_IME_SHOW_UI
    SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
#endif

    const auto windowFlags = SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI;
    auto window = SDL_CreateWindow("doompanning", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, windowFlags);
    if (!window)
        dp_sdl_fatal("SDL_CreateWindow");

    auto renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED);

    if (!renderer)
        dp_sdl_fatal("SDL_CreateRenderer");

    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    ImGui::StyleColorsDark();
    ImGui_ImplSDL2_InitForSDLRenderer(window, renderer);
    ImGui_ImplSDLRenderer_Init(renderer);

    dp_nng_init_limits(1, 1, 1);

    auto pubSock = make_ctrl_pub(CtrlUrl);
    auto subSock = make_ctrl_sub(DoomUrl);

    ControllerContext ctx
    {
        pubSock,
        subSock,
        window,
        renderer
    };

    int ret = doom_controller_loop(&ctx);

    nng_close(pubSock);
    nng_close(subSock);

    return ret;
}