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// MathLibrary.cpp : Defines the exported functions for the DLL.
#include "pch.h" // use stdafx.h in Visual Studio 2017 and earlier
#include <utility>
#include <limits.h>
#include "MathLibrary.h"
#include <iostream> // Include for using std::cout

// DLL internal state variables:
static unsigned long long previous_;  // Previous value, if any
static unsigned long long current_;   // Current sequence value
static unsigned index_;               // Current seq. position

// Initialize a Fibonacci relation sequence
// such that F(0) = a, F(1) = b.
// This function must be called before any other function.
void fibonacci_init(
    const unsigned long long a,
    const unsigned long long b)
{
    index_ = 0;
    current_ = a;
    previous_ = b; // see special case when initialized
}

// Produce the next value in the sequence.
// Returns true on success, false on overflow.
bool fibonacci_next()
{
    // check to see if we'd overflow result or position
    if ((ULLONG_MAX - previous_ < current_) ||
        (UINT_MAX == index_))
    {
        return false;
    }

    // Special case when index == 0, just return b value
    if (index_ > 0)
    {
        // otherwise, calculate next sequence value
        previous_ += current_;
    }
    std::swap(current_, previous_);
    ++index_;
    return true;
}

// Get the current value in the sequence.
unsigned long long fibonacci_current()
{
    return current_;
}

// Get the current index position in the sequence.
unsigned fibonacci_index()
{
    return index_;
}

Point test_point(Point points[],long count)
{
    if (count <= 0) {
        // Return a default Point with x and y set to 0
        Point defaultPoint = { 0, 0 };
        return defaultPoint;
    }

    Point maxPoint = points[0];
    int maxSum = maxPoint.x + maxPoint.y;

    for (int i = 1; i < count; ++i) {
        int currentSum = points[i].x + points[i].y;
        if (currentSum > maxSum) {
            maxSum = currentSum;
            maxPoint = points[i];
        }
    }

    int x = maxPoint.x;
    int y = maxPoint.y;
    std::cout << "x = " << x << ", y = " << y << std::endl;
    return maxPoint;
}