#include <stdio.h>
#include "SDL2/SDL.h"
#include "SDL2/SDL_timer.h"
#include "SDL2/SDL_image.h"

#define WINDOW_WIDTH (640)
#define WINDOW_HEIGHT (480)
#define SPEED (300)

int main (void)
{
	if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0)
	{
		printf("error initializing SDL: %s\n", SDL_GetError());
		return 1;
	}

	SDL_Window* win = SDL_CreateWindow("Hello There",
										SDL_WINDOWPOS_CENTERED,
										SDL_WINDOWPOS_CENTERED,
										WINDOW_WIDTH, WINDOW_HEIGHT, 0);
	if (!win)
	{
		printf("error creating window: %s\n", SDL_GetError());
		SDL_Quit();
		return 1;
	}

	Uint32 render_flags = SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC;
	SDL_Renderer* rend = SDL_CreateRenderer(win, -1, render_flags);
	if(!rend)
	{
		printf("error creating renderer: %s\n", SDL_GetError());
		SDL_DestroyWindow(win);
		SDL_Quit();
		return 1;
	}

	SDL_Surface* surface = IMG_Load("~/Workspace/learnSDL/red.png");
	if (!surface)
	{
		printf("error creating surface: %s\n", IMG_GetError());
		SDL_DestroyRenderer(rend);
		SDL_DestroyWindow(win);
		SDL_Quit();
		return 1;
	}

	SDL_Texture* tex = SDL_CreateTextureFromSurface(rend, surface);
	SDL_FreeSurface(surface);
	if (!tex)
	{
		printf("error creating texture: %s\n", SDL_GetError());
		SDL_DestroyRenderer(rend);
		SDL_DestroyWindow(win);
		SDL_Quit();
		return 1;
	}

	SDL_Rect dest;
	SDL_QueryTexture(tex, NULL, NULL, &dest.w, &dest.h);

	dest.w /= 4;
	dest.h /= 4;

	float y_pos = (WINDOW_HEIGHT - dest.h) / 2;
	float x_pos = (WINDOW_WIDTH - dest.h) / 2;
	float x_vel = 0;
	float y_vel = 0;

	while (dest.y >= -dest.h)
	{
		SDL_RenderClear(rend);
		dest.y = (int) y_pos;
		SDL_RenderCopy(rend,tex, NULL, &dest);
		SDL_RenderPresent(rend);

		y_pos -= (float) SPEED / 60;

		SDL_Delay(1000/60);
	}

	SDL_RenderClear(rend);
	SDL_RenderCopy(rend, tex, NULL, NULL);
	SDL_RenderPresent(rend);

	SDL_Delay(5000);
	SDL_DestroyTexture(tex);
	SDL_DestroyRenderer(rend);
	SDL_DestroyWindow(win);
	SDL_Quit();
}