/*
	Scott Hernandez

	midterm.cpp

	A body mass index calculator that displays the users BMI

	Input: date, weight, height in inches

	Processing: 1. Display Menu
					1. Body Mass Index Calculator
						Grab date, weight, height
						Calculate BMI from weight and height
						save to file
					2. Show Records
						read from file
						Display records 
					3. Quit
						Quit Program
				2. Loop until option 3 is chosen
					Good bye message

	Output: Display menu allowing user to enter or show records
*/

// Header Files
#include <iostream>
#include <cmath>
#include <iomanip>
#include <string>
#include <fstream>

using namespace std;

int main()
{
	// Variables
	int option = 0;

	string date, weightStanding, lineDate, lineStanding;
	double weight, BMI, lineBMI;
	int height;

	ofstream outputFile;
	ifstream inputFile;


	// Start of messages
	cout << endl << "Midterm - Body Mass Index Calculator App ..." << endl;

	while (option != 3) { // Continue until quit

		cout << endl << "Please choose one of the following options" << endl
			<< "\t1. Body Mass Index Calculator" << endl // OPTION 1 - Calculator for BMI and saving to file
			<< "\t2. Show Records" << endl // OPTION 2 - Show records from file
			<< "\t3. Quit" << endl // OPTION 3 - QUIT
			<< "option: ";

		cin >> option; // Get option

		while (!cin || (option < 1 || option > 3)) { // Validate for option value
			cout << endl << "Invalid option! Please try again!" << endl
				<< "option: ";
			cin.clear();
			cin.ignore(100, '\n');
			cin >> option;
		}

		switch (option) { // switch case for options
			case 1: // CASE 2

				if (outputFile.is_open()) // Close file if already open
					outputFile.close();
				
				cout << endl << "Please enter the current date: "; // prompt for current date
				cin.ignore();
				getline(cin, date);
				
				while (!cin || date == "") { // Continue if date is invalid
					cout << endl << "Please enter a valid date" << endl;
					cout << endl << "Enter current date: ";
					cin.clear();
					cin.ignore(100, '\n');
					getline(cin, date);
				}

				cout << endl << "Please enter the weight: "; // prompt for weight
				cin >> weight;

				while (!cin  || weight < 50) { // Continue if weight is invalid
					cout << endl << "Please enter a weight higher than 50" << endl;
					cout << endl << "Enter weight: ";
					cin.clear();
					cin.ignore(100, '\n');
					cin >> weight;
				}

				cout << endl << "Please enter height in inches: "; // prompt for height
				cin >> height;

				while (!cin || height < 30) { // Calculate if weight is invalid
					cout << endl << "Please enter a height higher than 30 inches" << endl;
					cout << endl << "Enter height: ";
					cin.clear();
					cin.ignore(100, '\n');
					cin >> height;
				}

				BMI = (weight * 703.0) / (pow(height, 2.0)); // Calculate BMI

				if (BMI > 25) // Get weight standing
					weightStanding = "Overweight";
				else if (BMI > 18.5)
					weightStanding = "Optimal Weight";
				else
					weightStanding = "Underweight";

				cout << endl << "Current BMI" << endl // Display values calculated
					<< "-----------------------------------" << endl
					<< left << setw(25) << date << setw(15) << showpoint << fixed << setprecision(1) << BMI << setw(15) << weightStanding << endl;
				
				
				outputFile.open("myBMI.txt", ios::app); // open file

				outputFile << date << endl << BMI << endl << weightStanding << endl; // Save to file

				outputFile.close(); // Close file
				

				break;
			case 2: // CASE 2

				if (inputFile.is_open()) // Close file if open
					inputFile.close();
				
				cout << endl << "Records" << endl; // Prompt start of records

				for (int i = 0; i < 30; i++) { // line of dashes with for loop
					cout << "-";
				}

				cout << endl;

				inputFile.open("myBMI.txt", ios::in); // open file with mode input

			
				bool hasLines = false; // boolean to check if file is empty
				while (getline(inputFile, lineDate)) { // Continue if file has lines
					hasLines = true; // file is not empty
					if (lineDate != "")
					{
						inputFile >> lineBMI; // get bmi from file
						inputFile >> lineStanding; // get standing from file

						cout << showpoint << fixed << setprecision(1);
						cout << endl << left << setw(25) << lineDate << setw(15) << lineBMI << setw(15) << lineStanding << endl; // Display records
					}
				}

				if (!hasLines) // Continue if no records
					cout << endl << "No records to display!" << endl;

				inputFile.close(); // Close file

				break;
		}
	}

	cout << endl << "Good Bye ..." << endl; // Good bye message

	return 0;
}

March 23, 2021
1.7575
Underweight
March 24, 2021
1.7575
Underweight