#pragma once

#include "units.hpp"
#include <string>
#include <tuple>
#include <memory>

class Body {
public:
    Body(const Position& X, const Velocity& V, const Mass& m, 
         const std::string& name = "");
    
    // Save and load state
    std::tuple<Position, Velocity, Mass> save() const;
    static Body load(const std::tuple<Position, Velocity, Mass>& tup);
    
    // Physics calculations
    void step(Decimal step_size);
    Decimal E() const;  // Total energy
    Decimal pe() const;  // Potential energy
    Decimal ke() const;  // Kinetic energy
    Decimal dist_from_o() const;  // Distance from origin
    std::string speed() const;  // Speed as formatted string
    
    // Getters
    const Position& getPosition() const { return X; } 
    const Velocity& getVelocity() const { return V; } 
    const Acceleration& getAcceleration() const { return A; }
    const Mass& getMass() const { return m; }
    const std::string& getName() const { return name; }
    
    // Setters
    void setAcceleration(const Acceleration& new_A) { A = new_A; }
    
    void addAcceleration(const Acceleration& new_A);
    void subAcceleration(const Acceleration& new_A);
    // String representation
    std::string toString() const;

private:
    Position X; 
    Velocity V;  
    Acceleration A;
    Mass m;
    std::string name;
    
    Decimal _speed() const;  // Internal speed calculation
};