// Trenton Stark
// CST-116
// Lab 2

#include <iostream>
#include <iomanip>
#include <cmath>

using std::cout;
using std::cin;
using std::endl;
using std::setw;

void inputTemp(float& cTemp, float& fTemp);
float tempConverter(float temp, bool dirc);
void inputWind(float& windS);
float windChillCalc(float fTemp, float windS);

const float fMin = -80, fMax = 121, cMin = -62, cMax = 49.5, wMin = 0, wMax = 231; //Minimum and maximum valid ranges for all user inputs

int main() {
	float cTemp, fTemp, windS, windC;

	cout << "Welcome to Cold Calculator v1.0" << endl;
	
	//input
	inputTemp(cTemp, fTemp);
	inputWind(windS);
	windC = windChillCalc(fTemp, windS);

	//output
	cout << "Calculations complete:" << endl;
	cout << setw(15) << "Celcius" << setw(15) << "Fahrenheit" << setw(15) << "Wind Speed" << setw(15) << "Wind Chill" << endl; //Header column
	cout << setw(15) << cTemp << setw(15) << fTemp << setw(15) << windS << setw(15) << windC << endl;
}

//Takes either celcius or fahrenheit then converts it to the other and outputs both by reference
void inputTemp(float& cTemp, float& fTemp) {
	char tempType;

	cout << "Would you like to enter the temperature in Celcius (c) or Fahrenehit (f)?" << endl;
	do {
		cin >> tempType;
		cout << endl;
		if (tempType != 'f' && tempType != 'c') {
			cout << "Input the character 'c' or 'f'!" << endl;
		}
	} while (tempType != 'f' && tempType != 'c'); //Loops if incorrect char input

	if (tempType == 'c') {
		cout << "What is the temperature in Celcius (-62 - 49.5 degrees)?" << endl;
		do {
			cin >> cTemp;
			cout << endl;
			if (cTemp < cMin || cTemp > cMax) {
				cout << "Input a value between -62 and 49.5 degrees!" << endl;
			}
			fTemp = tempConverter(cTemp, 0);
		} while (cTemp < cMin || cTemp > cMax); //Loops if input is not in range
	}
	else {
		cout << "What is the temperature in Fahrenheit (-80 - 121 degrees)?" << endl;
		do {
			cin >> fTemp;
			cout << endl;
			if (fTemp < fMin || fTemp > fMax) {
				cout << "Input a value between -80 and 121 degrees!" << endl;
			}
			cTemp = tempConverter(fTemp, 1);
		} while (fTemp < fMin || fTemp > fMax); //Loops if input is not in range
	}
}


// Direction is 0 if going celcius to fahrenheit and 1 if going fahrenheit to celcius
float tempConverter(float temp, bool dirc) {
	float conTemp; //Temperature after conversion, either celcius of fahrenheit

	if (dirc == 0) {
		conTemp = (temp * (9.0 / 5.0)) + 32;
	}
	else {
		conTemp = (temp - 32) * (5.0 / 9.0);
	}

	return conTemp; 
}

//Gets wind speed and passes it back through reference
void inputWind(float& windS) {
	cout << "What is the wind speed in miles per hour (0 - 231)" << endl;
	do {
		cin >> windS;
		cout << endl;
		if (windS < 0 || windS > 231) {
			cout << "Input a value between 0 and 231 miles per hour!" << endl;
		}
	} while (windS < 0 || windS > 231); //Loops if input is not in range
}

//Converts a temperature in fahrenheit and a wind speed in miles per hour to windchill
float windChillCalc(float fTemp, float windS) {
	float windC; 
	windC = 35.74 + (0.6125 * fTemp) - (35.75 * pow(windS, 0.16)) + (0.4275 * fTemp * pow(windS, 0.16)); //Formula from https://www.weather.gov/media/epz/wxcalc/windChill.pdf
	return windC;
}