/*
 * This example code creates an SDL window and renderer, and then clears the
 * window to a different color every frame, so you'll effectively get a window
 * that's smoothly fading between colors.
 *
 * This code is public domain. Feel free to use it for any purpose!
 */

#include <malloc.h>
#include <stdio.h>
#include <SDL3/SDL_pixels.h>
#include <SDL3/SDL_rect.h>
#include <SDL3/SDL_render.h>
#include <SDL3/SDL_video.h>
#define SDL_MAIN_USE_CALLBACKS 1  /* use the callbacks instead of main() */
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>
#include "include/glad/gl.h"

/* We will use this renderer to draw into this window every frame. */
static SDL_Window *window = NULL;
static SDL_Renderer *renderer = NULL;
static SDL_GLContext context = NULL;

/* This function runs once at startup. */
SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
{
    SDL_SetAppMetadata("Heartbeat", "1.0", "io.typetrait.heartbeat");

    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 6);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);

    if (!SDL_Init(SDL_INIT_VIDEO)) {
        SDL_Log("Couldn't initialize SDL: %s", SDL_GetError());
        return SDL_APP_FAILURE;
    }

    if (!SDL_CreateWindowAndRenderer("Heartbeat", 640, 480, SDL_WINDOW_RESIZABLE, &window, &renderer)) {
        SDL_Log("Couldn't create window/renderer: %s", SDL_GetError());
        return SDL_APP_FAILURE;
    }

    int version = gladLoadGL((GLADloadfunc)SDL_GL_GetProcAddress);
    if (version == 0) {
        printf("Failed to initialize OpenGL context\n");
        return SDL_APP_FAILURE;
    }

    context = SDL_GL_CreateContext(window);

    SDL_SetRenderLogicalPresentation(renderer, 640, 480, SDL_LOGICAL_PRESENTATION_LETTERBOX);

    return SDL_APP_CONTINUE;
}

/* This function runs when a new event (mouse input, keypresses, etc) occurs. */
SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event)
{
    if (event->type == SDL_EVENT_QUIT) {
        return SDL_APP_SUCCESS;
    }
    return SDL_APP_CONTINUE;
}

/* This function runs once per frame, and is the heart of the program. */
SDL_AppResult SDL_AppIterate(void *appstate)
{
    SDL_RenderLine(renderer, 0.0f, 0.0f, 15.0f, 15.0f);

    glClearColor(1.0f, 0.8f, 0.2f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    SDL_GL_SwapWindow(window);

    return SDL_APP_CONTINUE;
}

/* This function runs once at shutdown. */
void SDL_AppQuit(void *appstate, SDL_AppResult result)
{
    /* SDL will clean up the window/renderer for us. */
    SDL_GL_DestroyContext(context);
    // SDL_DestroyWindow(window);
    // SDL_Quit();
}