#include "effect_snake.h"
#include "functions.h"

SnakeEffect::SnakeEffect() {
	this->coords = {0, 0};
	this->window = new Window(0, 0, LED_WIDTH, LED_HEIGHT-6);
}

SnakeEffect::~SnakeEffect() {
	delete window;
}

void SnakeEffect::loop() {
	if (run++ % EFFECT_SNAKE_SLOWDOWN == 0) { // Change the coordinates only on every n-th run.
		if (random8(EFFECT_SNAKE_DIRECTION_CHANGE)==0 || is_turn_needed()) turn_random();

		this->coords = update_position(this->coords, this->direction);
	}

	window->fadeToBlackBy(2);
	CRGB color(CHSV(hue, 200, 255));
	window->setPixel(this->coords.x, this->coords.y, &color);
	hue++;
}

void SnakeEffect::turn_random() {
	if ((random8() & 1) == 0) {
		turn_right() || turn_left();
	} else {
		turn_left() || turn_right();
	}
}

bool SnakeEffect::turn_left() {
	if (!is_direction_okay(this->direction - 1)) return false;
	this->direction--;
	return true;
}

bool SnakeEffect::turn_right() {
	if (!is_direction_okay(this->direction + 1)) return false;
	this->direction++;
	return true;
}

bool SnakeEffect::is_turn_needed() {
	return !is_direction_okay(this->direction);
}

bool SnakeEffect::is_direction_okay(uint8_t dir) {
	Coords c = update_position(this->coords, dir);
	return c.x<window->width && c.y<window->height;
}

Coords SnakeEffect::update_position(Coords original, uint8_t direction) {
	direction = direction % 4;
	if (direction == 0) original.y--;
	else if (direction == 1) original.x++;
	else if (direction == 2) original.y++;
	else if (direction == 3) original.x--;
	return original;
}

boolean SnakeEffect::can_be_shown_with_clock() { return true; }