#include "texture.h"
#include "ball.h"
#include "defines.h"
#include <iostream>

SDL_Window *window = NULL;
SDL_Renderer *renderer = NULL;
SDL_Event *event;
Texture *texture = nullptr;
Ball *ball[NUM_BALLS];

bool shouldExit = false;
Uint32 ticks = 0;

bool init()
{
	// Initialization flag
	bool success = true;

	// Initialize SDL
	if (SDL_Init(SDL_INIT_VIDEO) < 0)
	{
		printf("SDL could not initialize! SDL Error: %s\n", SDL_GetError());
		success = false;
	}
	else
	{
		// Create window
		window = SDL_CreateWindow("demo_pelotas1", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH * 2, SCREEN_HEIGHT * 2, SDL_WINDOW_SHOWN);
		if (window == NULL)
		{
			printf("Window could not be created! SDL Error: %s\n", SDL_GetError());
			success = false;
		}
		else
		{
			// Create renderer for window
			renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
			if (renderer == NULL)
			{
				printf("Renderer could not be created! SDL Error: %s\n", SDL_GetError());
				success = false;
			}
			else
			{
				// Initialize renderer color
				SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);

				SDL_RenderSetLogicalSize(renderer, SCREEN_WIDTH, SCREEN_HEIGHT);
			}
		}
	}

	event = new SDL_Event();

	texture = new Texture(renderer, TEXTURE_FILE);
	for (int i = 0; i < NUM_BALLS; ++i)
	{
		const int vx = rand() % 2 == 0 ? 1 : -1;
		const int vy = rand() % 2 == 0 ? 1 : -1;
		const int x = rand() % SCREEN_WIDTH;
		const int y = rand() % SCREEN_HEIGHT;
		const int size = BALL_SIZE;
		ball[i] = new Ball(x, y, size, size, vx, vy, texture);
	}

	ticks = SDL_GetTicks();
	srand(time(NULL));

	return success;
}

void close()
{
	// Destroy window
	SDL_DestroyRenderer(renderer);
	SDL_DestroyWindow(window);
	window = NULL;
	renderer = NULL;

	if (event)
	{
		delete event;
	}

	if (texture)
	{
		delete texture;
	}

	for (int i = 0; i < NUM_BALLS; ++i)
	{
		if (ball[i])
		{
			delete ball[i];
		}
	}

	// Quit SDL subsystems
	SDL_Quit();
}

void checkEvents()
{
	// Comprueba los eventos que hay en la cola
	while (SDL_PollEvent(event) != 0)
	{
		// Evento de salida de la aplicación
		if (event->type == SDL_QUIT)
		{
			shouldExit = true;
			break;
		}

		if (event->type == SDL_KEYDOWN && event->key.repeat == 0)
		{
			switch (event->key.keysym.sym)
			{
			case SDLK_ESCAPE:
				shouldExit = true;
				break;
			
			default:
				break;
			}
		}
	}
}

void update()
{
	if (SDL_GetTicks() - ticks > 15)
	{
		ticks = SDL_GetTicks();

		for (int i = 0; i < NUM_BALLS; ++i)
		{
			ball[i]->update();
		}
	}
}

void render()
{
	SDL_SetRenderDrawColor(renderer, BG_R, BG_G, BG_B, 255);
	SDL_RenderClear(renderer);

	for (int i = 0; i < NUM_BALLS; ++i)
	{
		ball[i]->render();
	}

	SDL_RenderPresent(renderer);
}

int main(int argc, char *args[])
{
	init();

	while (!shouldExit)
	{
		update();
		checkEvents();
		render();
	}

	close();

	return 0;
}