// Alicia Thorsen
// caloric_intake_calculator_functions.C
// 2/1/08
//
// Calculates the daily recommended number of calories a person should
// consume to lose weight. Can also be used for weight maintenance and
// weight gain.

#include <iostream>
using namespace std;

// # of calories in a lb
const int CAL_IN_A_LB = 3500;

void getUserInfo(double&, double&, char&, int&, int&, int&, double&);
double calculateBMI(double, double);
double sedentaryLifestyleNeeds(char, double, double, int);
void recommendedCaloricIntake(double, int, int, double);

int main() {
  double weight = 0, height = 0, bmi = 0, sedentaryNeeds = 0, lbsToLose = 0;
  int age = 0, cardioDays = 0, cardioCal = 0;
  char sex, quit = 'n';

  system("clear");
  cout << "\nWelcome to the Daily Caloric Intake Calculator!";
  cout << "\n~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n";
  cout << "\nTo get started, we need some basic information.";

  do {
    // Get personal information from user
    getUserInfo(weight, height, sex, age, cardioDays, cardioCal, lbsToLose);

    // Calculate body mass index
    bmi = calculateBMI(weight, height);

    // Calculate # of calories required for a sedentary lifestyle
    sedentaryNeeds = sedentaryLifestyleNeeds(sex, weight, height, age);

    // Calculate recommended daily caloric intake
    recommendedCaloricIntake(sedentaryNeeds, cardioDays, cardioCal, lbsToLose);

    cout << "\nWould you like to quit? (y/n) : ";
    cin >> quit;

  } while (quit != 'y');

  cout << endl;
  return 0;
}

void getUserInfo(double& weight, double& height, char& sex, int& age,
                 int& cardioDays, int& cardioCal, double& lbsToLose) {
  int heightFt = 0, heightIn = 0;
  char temp;

  // Get user personal data
  cout << "\n\nWeight in lbs: ";
  cin >> weight;
  cout << "Height (e.g. 5'7\"): ";
  cin >> heightFt >> temp >> heightIn >> temp;
  cout << "Sex (m/f): ";
  cin >> sex;
  cout << "Age: ";
  cin >> age;
  cout << "# of days of cardio workout per week: ";
  cin >> cardioDays;
  cout << "# of calories burned per cardio workout: ";
  cin >> cardioCal;
  cout << "# of lbs to lose per week : ";
  cin >> lbsToLose;

  // Convert weight to kg and height to m
  weight /= 2.2;
  height = ((heightFt * 12) + heightIn) * 0.0254;

}

double calculateBMI(double weight, double height) {
  double bmi = 0, weightLowerEnd = 0, weightUpperEnd = 0;
  // Calculate BMI
  bmi = weight / (height * height);

  // Output BMI and category
  cout.setf(ios::fixed | ios::showpoint);
  cout.precision(1);
  cout << "\nYour BMI is " << bmi << ".\n";

  cout << "Based on your BMI, ";
  if (bmi < 18.5)
    cout << "you are underweight.";
  else if (bmi < 25)
    cout << "your weight is normal.";
  else if (bmi < 30)
    cout << "you are overweight.";
  else
    cout << "you are obese.";

  weightLowerEnd = 18.6 * height * height * 2.2;
  weightUpperEnd = 24.9 * height * height * 2.2;

  // Output recommended weight ranges
  cout << "\nYour recommended weight range is "
      << static_cast<int>(weightLowerEnd) << " to "
      << static_cast<int>(weightUpperEnd) << endl;

  return bmi;
}

double sedentaryLifestyleNeeds(char sex, double weight, double height,
                               int age) {
  double bmr = 0;

  // Basal Metabolic Rate (BMR)
  if (sex == 'm')
    bmr = 66 + (13.7 * weight) + (5 * height * 100) - (6.8 * age);
  else
    bmr = 655 + (9.6 * weight) + (1.8 * height * 100) - (4.7 * age);

  // Sedentary lifestyle needs
  return (bmr * 1.2);
}

void recommendedCaloricIntake(double sedentaryNeeds, int cardioDays,
                              int cardioCal, double lbsToLose) {
  double dailyCalBurned = 0, calIntake;
  int calUpperEnd = 0, calLowerEnd = 0;

  // Calories burned daily from bodily functions & exercise
  dailyCalBurned = sedentaryNeeds + ((cardioDays * cardioCal) / 7);

  // Recommended caloric intake for desired weight loss
  calIntake = dailyCalBurned - ((CAL_IN_A_LB * lbsToLose) / 7);

  calLowerEnd = static_cast<int>(calIntake) - 250;
  calUpperEnd = static_cast<int>(calIntake) + 100;

  cout << "\nRecommended Daily Caloric Intake is " << calLowerEnd
      << " to " << calUpperEnd << ".\n";
}