/*
 * Author: Kylan Byrd
 *
 * Find the level of the atmosphere for a certain altitude.
 *
 * V-0.1 Date: 9/18/2017
 * V-0.2 Date: 9/18/2017
 *
 * Compile with g++ -sted=c++11 -Wall -o atmosphere atmosphere.cpp
 */

#include <iostream>
#include <string>
#include <limits>

using namespace std;

//Declare constant strings for messages to display to the user during use of the program, as well as .

//Messages for selection of measurement metric.
const string UNIT_OF_MEASURE = "Which unit of measurement would you like to use? [0 = Miles, 1 = Metric]";
const string UNIT_VALIDATION = "That was an invalid option. Please try again.";

//Set variables for measurement system.
const int MILES = 0;
const int METRIC = 1;

//Set variable for unit validation.
bool unit_validation_check = false;
int wanted_unit;

//Messages for user input of height.
const string REQEUST_HEIGHT = "What is the height in question? [Use only numbers]";
const string HEIGHT_VALIDATION = "That was an invalid entry. Please try again using only numbers.";

//Declare variable for user input.
float height;

//Messages for atmospheric level.
const string SURFACE_MESSAGE = " is on the surface, which is at the bottom of the Troposphere.";
const string UNDERGROUND_MESSAGE = " is underground. This is not in the atmosphere.";
const string OUTERSPACE_MESSAGE = " is in outerspace. This is not in the atmosphere, as it is past the Exosphere which is the highest level.";
const string TROPOSPHERE_MESSAGE = " is in the Troposphere. This is the lowest level of the atmosphere.";
const string STRATOSPHERE_MESSAGE = " is in the Stratosphere. This is the second lowest level of the atmosphere.";
const string MESOSPHERE_MESSAGE = " is in the Mesosphere. This is the middle level of the atmosphere.";
const string THERMOSPHERE_MESSAGE = " is in the Thermosphere. This is the second highest level of the atmosphere.";
const string EXOSPHERE_MESSAGE = " is in the Exosphere. This is the highest level of the atmosphere.";

//Set atmospheric values.
const int SURFACE = 0;

const int TROPOSPHERE_METRIC = 12;
const int TROPOSPHERE_MILES = 7;

const int STRATOSPHERE_METRIC = 50;
const int STRATOSPHERE_MILES = 31;

const int MESOSPHERE_METRIC = 80;
const int MESOSPHERE_MILES = 50;

const int THERMOSPHERE_METRIC = 700;
const int THERMOSPHERE_MILES = 440;

const int EXOSPHERE_METRIC = 10000;
const int EXOSPHERE_MILES = 6200;

//Set max
const int MAX_FLOAT_VALUE = std::numeric_limits<float>::max();

int main()
{
    //Determine unit of measure.
    do
    {
        unit_validation_check = false; //Reset the flag to false for the following condition check.
        cout << UNIT_OF_MEASURE << endl;
        cin >> wanted_unit;

        //Check for failure status.
        if ( cin.fail() )
        {
            cin.clear(); //Clear the input buffer.
            unit_validation_check = true; //Change the flag to trigger the loop.
        }

    }
    //Loop until user inputs acceptable option.
    while (( unit_validation_check || wanted_unit < 0 || wanted_unit > 1 ) && cout << UNIT_VALIDATION << endl );

    //Calculate Atmospheric layer, and print result.
    if (height < 0 || height > 6200)
    {
        cout << height
             << " miles is not in the atmosphere."
             << endl;
    }
    else if ( height <= 7 )
    {
        cout << height
             << " miles is in the Troposphere."
             << endl;
    }
    else if ( height <= 31 )
    {
        cout << height
             << " miles is in the Stratosphere."
             << endl;
    }
    else if ( height <= 50 )
    {
        cout << height
             << " miles is in the Mesosphere."
             << endl;
    }
    else if ( height <= 440 )
    {
        cout << height
             << " miles is in the Thermosphere."
             << endl;
    }
    else if ( height <= 6200 )
    {
        cout << height
             << " miles is in the Exosphere."
             << endl;
    }
    else
    {
        cout << "I don't think "
             << height
             << "is what I asked for."
             << endl;
    }
}