#include "Functions.h"

enum {
  Age,
  Wt,
  Ht,
  IQ,
  DrinksPerWk,
  ExercisePerWk,
  HealthIdx,
  HappyIdx,
  NetWorth
};

// Local prototypes

double SimilarHeight(const Arg_List &x);
double Taller(const Arg_List &x);
double Old(const Arg_List &x);
double Drinker(const Arg_List &x);
double Tall(const Arg_List &x);
double Poor(const Arg_List &x);
double Healthy(const Arg_List &x);
double Happy(const Arg_List &x);
double Athletic(const Arg_List &x);
double Smart(const Arg_List &x);
double Overweight(const Arg_List &x);

// Implementation

double SimilarHeight(const Arg_List &x)
{
  double temp = x.arg1[Ht] - x.arg2[Ht];
  if (temp < 0.0) temp = - temp;
  double spread = temp/18.0;
  if (spread > 1.0) spread = 1.0;
  return (spread * spread);
}

double Taller(const Arg_List &x)
{
  return (x.arg1[Ht] > x.arg2[Ht] ? 1.0 : 0.0);
}

double Old(const Arg_List &x)
{
  double temp = x.arg1[Age] / 100.0;
  if (temp > 1.0)
    temp = 1.0;
  else if (temp < 0.0)
    temp = 0.0;
  return (temp);
}

double Drinker(const Arg_List &x)
{
  double temp = x.arg1[DrinksPerWk] / 28.0;
  if (temp > 1.0)
    temp = 1.0;
  else if (temp < 0.0)
    temp = 0.0;
  return (temp);
}

double Tall(const Arg_List &x)
{
  double temp = x.arg1[Ht] / 72.0;
  if (temp > 1.0)
    temp = 1.0;
  else if (temp < 0.0)
    temp = 0.0;
  return (temp);
}

double Poor(const Arg_List &x)
{
  double temp = x.arg1[NetWorth] / 1000000.0;
  if (temp > 1.0)
    temp = 1.0;
  else if (temp < 0.0)
    temp = 0.0;
  return (1 - temp);
}

double Overweight(const Arg_List &x)
{
  double kg = x.arg1[Wt] / 2.2;
  double m = x.arg1[Ht] / 2.54;
  double idx = kg / (m * m);
  double temp = idx / 30.0;
  if (temp > 1.0)
    temp = 1.0;
  else if (temp < 0.0)
    temp = 0.0;
  return (temp);
}

double Smart(const Arg_List &x)
{
  double temp = x.arg1[IQ] / 160.0;
  if (temp > 1.0)
    temp = 1.0;
  else if (temp < 0.0)
    temp = 0.0;
  return (temp);
}

double Athletic(const Arg_List &x)
{
  double temp = x.arg1[ExercisePerWk] / 25.0;
  if (temp > 1.0)
    temp = 1.0;
  else if (temp < 0.0)
    temp = 0.0;
  return (temp);
}

double Happy(const Arg_List &x)
{
  double temp = x.arg1[HappyIdx] / 10.0;
  if (temp > 1.0)
    temp = 1.0;
  else if (temp < 0.0)
    temp = 0.0;
  return (temp);
}

double Healthy(const Arg_List &x)
{
  double temp = x.arg1[HealthIdx] / 10.0;
  if (temp > 1.0)
    temp = 1.0;
  else if (temp < 0.0)
    temp = 0.0;
  return (temp);
}


Function functions_b[] = 
{
 {"Smart", Smart},
 {"SimilarHeight", SimilarHeight},
 {"Old", Old},
 {"Drinker", Drinker},
 {"Tall", Tall},
 {"Poor", Poor},
 {"Taller", Taller},
 {"Overweight", Overweight},
 {"Healthy", Healthy},
 {"Happy", Happy},
 {"Athletic", Athletic}
};

Function *functions = functions_b;

const int num_functions = sizeof(functions_b) / sizeof(Function);