#include "path_sprite.h"
#include "utils.h"
class Texture;

// Constructor
PathSprite::PathSprite(std::shared_ptr<Texture> texture)
	: AnimatedSprite(texture) {}

// Actualiza la posición y comprueba si ha llegado a su destino
void PathSprite::update()
{
	if (enabled_)
	{
		moveThroughCurrentPath();
		goToNextPathOrDie();
	}
}

// Añade un path vertical
void PathSprite::addVerticalPath(SDL_Point start, SDL_Point end, int steps, int waiting_counter)
{
	paths_.emplace_back(createVerticalPath(start, end, steps), waiting_counter);
}

// Añade un path horizontal
void PathSprite::addHorizontalPath(SDL_Point start, SDL_Point end, int steps, int waiting_counter)
{
	paths_.emplace_back(createHorizontalPath(start, end, steps), waiting_counter);
}

// Devuelve un vector con los puntos que conforman la ruta
std::vector<SDL_Point> PathSprite::createVerticalPath(SDL_Point start, SDL_Point end, int steps)
{
	std::vector<SDL_Point> v;
	v.reserve(steps);

	for (int i = 0; i < steps; ++i)
	{
		double t = static_cast<double>(i) / steps;
		double value = static_cast<double>(start.y) + (end.y - start.y) * easeOutQuint(t);
		v.emplace_back(SDL_Point{start.x, static_cast<int>(value)});
	}

	return v;
}

// Devuelve un vector con los puntos que conforman la ruta
std::vector<SDL_Point> PathSprite::createHorizontalPath(SDL_Point start, SDL_Point end, int steps)
{
	std::vector<SDL_Point> v;
	v.reserve(steps);

	for (int i = 0; i < steps; ++i)
	{
		double t = static_cast<double>(i) / steps;
		double value = static_cast<double>(start.x) + (end.x - start.x) * easeOutQuint(t);
		v.emplace_back(SDL_Point{static_cast<int>(value), start.y});
	}

	return v;
}

// Habilita el objeto
void PathSprite::enable()
{
	enabled_ = true;
}

void PathSprite::moveThroughCurrentPath()
{
	auto &path = paths_.at(current_path_);

	// Establece la posición
	const SDL_Point p = path.spots.at(path.counter);
	MovingSprite::setPos(p.x, p.y);

	// Comprobar si ha terminado el recorrido
	if (!path.on_destination)
	{
		++path.counter;
		if (path.counter >= static_cast<int>(path.spots.size()))
		{
			path.on_destination = true;
			path.counter = static_cast<int>(path.spots.size()) - 1;
		}
	}

	// Comprobar si ha terminado la espera
	if (path.waiting_counter == 0)
		path.finished = true;
	else if (path.on_destination)
		--path.waiting_counter;
}

void PathSprite::goToNextPathOrDie()
{
	// Comprueba si ha terminado el recorrdo actual
	if (paths_.at(current_path_).finished)
		++current_path_;

	// Comprueba si quedan mas recorridos
	if (current_path_ >= static_cast<int>(paths_.size()))
		enabled_ = false;
}

// Indica si ha terminado todos los recorridos
bool PathSprite::hasFinished()
{
	return !enabled_;
}