// Tutorial1_curve.cpp : Defines the entry point for the console application.
//

//#include "stdafx.h"
#include <iostream>
using namespace std;

//double max_value(double v1, double v2) {
//	return v1 <= v2 ? v2 : v1;
//}


double max_value(double v1, double v2) {
	return v1 <= v2 ? v2 : v1;
}


double linear_interpolation(double t1, double t2, double t, double v1, double v2){
	if (t1 > t2) {
		cout << "Please updated the tenors " << endl;
		return -100.0;
	}

	if (t < t1 || t > t2) {
		cout << "Please updated the tenors " << endl;
		return -100.0;
	}

	return v1 + (v2 - v1)*(t - t1) / (t2 - t1);
}

double flat_interpolation(double t1, double t2, double t, double v1, double v2) {
	if (t1 > t2) {
		cout << "Please updated the tenors " << endl;
		return -100.0;
	}

	if (t < t1 || t > t2) {
		cout << "Please updated the tenors " << endl;
		return -100.0;
	}


	return t - t1 > t2 - t ? v2 : v1;
}


int main()
{
	double tenor1 = 0.0;
	double tenor2 = 0.0;
	double value1 = 0.0;
	double value2 = 0.0;
	double tenor;

	cout << "Please enter tenor1 " << endl;
	cin >> tenor1;

	if (tenor1 < 0) {
		cout << "Please enter correct tenor" << endl;
	};
	cout << "Please enter tenor2 " << endl;
	cin >> tenor2;
	if (tenor2 < 0) {
		cout << "Please enter correct tenor" << endl;
	};

	cout << "Please enter value1 " << endl;
	cin >> value1;

	cout << "Please enter value2 " << endl;
	cin >> value2;

	cout << "Tenor1 is " << tenor1 << endl;
	cout << "Tenor2 is " << tenor2 << endl;
	cout << "value1 is " << value1 << endl;
	cout << "value2 is " << value2 << endl;

	cout << "The maximum between two values is " << max_value(value1, value2) << endl;
	
	cout << "Please enter tenor we need to interpolate" << endl;
	cin >> tenor;


	cout << "The linearly interpolated value is " << linear_interpolation(tenor1, tenor2, tenor, value1, value2) << endl;

	cout << "The flat interpolated value is " << flat_interpolation(tenor1, tenor2, tenor, value1, value2) << endl;

	system("pause");
    return 0;
}