//
//  Field.h
//  interface
//
//  Created by Philip Rosedale on 8/23/12.
//  Copyright (c) 2012 High Fidelity, Inc. All rights reserved.
//

#ifndef __interface__Field__
#define __interface__Field__

#include <iostream>
#include <glm/glm.hpp>
#include "InterfaceConfig.h"
#include "world.h"
#include "Util.h"

const int FIELD_ELEMENTS = 1000;

///  Field is a lattice of vectors uniformly distributed in 3D with FIELD_ELEMENTS^(1/3) per side
class Field {
public:
    struct FieldElement {
        glm::vec3 val;
        glm::vec3 center;
        glm::vec3 fld;
    } _field[FIELD_ELEMENTS];
        
    Field(float worldSize, float coupling);
    /// The field value at a position in space, given simply as the value of the enclosing cell
    int value(float *ret, float *pos);
    /// Visualize the field as vector lines drawn at each center
    void render();
    /// Add to the field value cell enclosing a location
    void add(float* add, float *loc);
    /// A particle with a position and velocity interacts with the field given the coupling
    /// constant passed when creating the field.
    void interact(float deltaTime, const glm::vec3& pos, glm::vec3& vel);
    /// Field evolves over timestep
    void simulate(float deltaTime);
private:
    float _worldSize;
    float _coupling;
};

#endif