module;

#include <iostream>
#include <string>
#include <SDL3/SDL.h>

import sprite;

export module sdl_app;

export {
    struct AppState {
        SDL_Window* window = nullptr;
        SDL_Renderer* renderer = nullptr;
        Sprite* sprite = nullptr;
    };

    SDL_AppResult sdl_panic(
        const std::string& error_prefix,
        SDL_Window* window = nullptr,
        SDL_Renderer* renderer = nullptr
    ) {
        std::cerr << error_prefix << ": " << SDL_GetError() << std::endl;

        if (renderer != nullptr) {
            SDL_DestroyRenderer(renderer);
        }
        if (window != nullptr) {
            SDL_DestroyWindow(window);
        }

        SDL_Quit();
        return SDL_APP_FAILURE;
    }

    SDL_AppResult sdl_app_init(AppState* app_state) {
        if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS)) {
            return sdl_panic("SDL_Init error");
        }

        app_state->window = SDL_CreateWindow("BuildSystemTest", 640, 480, 0);
        if (app_state->window == nullptr) {
            return sdl_panic("SDL_CreateWindow error");
        }

        app_state->renderer = SDL_CreateRenderer(app_state->window, nullptr);
        if (app_state->renderer == nullptr) {
            return sdl_panic("SDL_CreateRenderer error", app_state->window);
        }

        try {
            app_state->sprite = new Sprite(app_state->renderer, "assets/neocat.png", 100, 100);
        }
        catch (const std::runtime_error& e) {
            return sdl_panic(e.what(), app_state->window, app_state->renderer);
        }

        return SDL_APP_CONTINUE;
    }

    SDL_AppResult sdl_app_event(const AppState* app_state, const SDL_Event* event) {
        if (event->type == SDL_EVENT_QUIT) {
            return SDL_APP_SUCCESS;
        }

        if (event->type == SDL_EVENT_MOUSE_MOTION) {
            app_state->sprite->move(
                event->motion.x - 50,
                event->motion.y - 50
            );
        }

        return SDL_APP_CONTINUE;
    }

    SDL_AppResult sdl_app_iterate(const AppState* app_state) {
        SDL_RenderClear(app_state->renderer);
        app_state->sprite->render(app_state->renderer);
        SDL_RenderPresent(app_state->renderer);

        return SDL_APP_CONTINUE;
    }

    void sdl_app_shutdown(const AppState* app_state) {
        delete app_state->sprite;
        SDL_DestroyRenderer(app_state->renderer);
        SDL_DestroyWindow(app_state->window);
    }
}