#ifndef COORDINATE_H
#define COORDINATE_H

// Programmer: Brett Weiland
// Date: 4/30/23
// File: coordinate.h
// Assignment: SP-B-finalProject
// Purpose: conatins class for coordinates, 
//          as well as namespace for direction parsing and computations.

#include <cstdint>

//Directions are represented by a 4 bit bitmap, 
//where north is the least significant bit.
//direction typed vars should never have more then 2 bits set, 
//bits must be next to eachother or wrapped around.
namespace direction {
  //type is used to gaurentee we have an unsigned integer of at least 8 bits
  typedef uint8_t TYPE; 
  const direction::TYPE NONE = 0;
  const direction::TYPE N = 0;
  const direction::TYPE E = 1;
  const direction::TYPE S = 2;
  const direction::TYPE W = 3;

  //used to ensure a direction doesn't contain bits past its MSB
  const direction::TYPE MASK = ((1 << N) | (1 << E) | (1 << S) | (1 << W));
}

class coordinate {
  private:
    int x, y;
  public:
    //Desc: initilizer for coordinate, sets X/Y to 0
    //Pre:  none
    //Post: coordinate initilized
    coordinate();

    //Desc: initilizer for coordinate with X/Y to passed value
    //Pre:  X/Y passed
    //Post: coordinate initilized
    coordinate(int pos_x, int pos_y);
    
    //Desc: finds the amount of steps it takes from one point to the other,
    //      takes limited movement into account
    //Pre:  objective is passed
    //Post: returns number of steps it'd take an npc to get to objective
    int getSteps(const coordinate &objective) const;

    //Desc: finds the direction an object at this coordinate would need to take
    //      to arrive at objective
    //Pre:  objective with coordinates within city bounds passed
    //Post: direction returned
    direction::TYPE getDirection(const coordinate &objective) const;
    
    //Desc: modifies this coordinate to step one direction in a certain path
    //Pre:  direction given, does not check for possible obstructions
    //Post: this modified to take step in path
    void stepDirection(const direction::TYPE path);

    //geters and seters
    int get_x() const;
    int get_y() const;
    void set_x(const int pos_x);
    void set_y(const int pos_y);
    void set_xy(const int pos_x, const int pos_y);

};

#endif