#include<iostream>
#include<fstream>
#include<cmath>
#include "quadrilateral.h"
using namespace std;

void Quadrilateral::validate()
{
	Quadrilateral p1, p2, p3, p4;
	if(p1.x < p2.x && p1.y == p2.y && p4.x < p3.x && p4.y == p3.y)
	{
		a = p1;
		b = p2;
		c = p3;
		d = p4;
	}
	else 
	{
		cout << "Incorrect order. Here are the coordinates";
		cout << " in the correct order:" << endl;
		Quadrilateral();
	}	 	 
}

Quadrilateral::Quadrilateral()
{
	a = Point(-1,-1);
	b = Point(3,0);
	c = Point(2,2);
	d = Point(1,1);
}

Quadrilateral::Quadrilateral(Point &p1, Point &p2, Point &p3, Point &p4)
{
	SetAll(p1,p2,p3,p4);
	validate();
}

void Quadrilateral::SetA(Point &p1)
{
	a = p1;
	return;
}

void Quadrilateral::SetB(Point &p2)
{
	b = p2;
	return;
}

void Quadrilateral::SetC(Point &p3)
{
	c = p3;
	return;
}

void Quadrilateral::SetD(Point &p4)
{
	d = p4;
	return;
}

void Quadrilateral::SetAll(Point &p1, Point &p2, Point &p3, Point &p4)
{
	a = p1;
	b = p2;
	c = p3;
	d = p4;
	validate();
	return;
}

Point Quadrilateral::GetA(void) const
{
	return a;
}

Point Quadrilateral::GetB(void) const
{
	return b;
}

Point Quadrilateral::GetC(void) const
{
	return c;
}

Point Quadrilateral::GetD(void) const
{
	return d;
}

double Quadrilateral::Perimeter()
{
	double side1 = a.Distance(b);
	double side2 = b.Distance(c);
	double side3 = c.Distance(d);
	double side4 = d.Distance(a);
	return(side1 + side2 + side3 + side4);
}

double Quadrilateral::Area()
{
	double side1 = a.Distance(b);
	double side2 = b.Distance(c);
	double side3 = c.Distance(a);
	double side4 = c.Distance(d);
	double side5 = d.Distance(a);
	double semi1 = (side1 + side2 + side3)/2;
	double semi2 = (side3 + side4 + side5)/2;
	double area1 = sqrt(semi1 * (semi1 - side1) *
	                   (semi1 - side2) * (semi1 - side3));
	double area2 = sqrt(semi2 * (semi2 - side3) * (semi2 - side4)
					 * (semi2 - side5));
	return(area1 + area2);
}

void Quadrilateral::Print()
{
	Quadrilateral p1, p2, p3, p4;
	cout << "I'm a Quadrilateral" << endl;
	cout << "(" << p1.x << "," << p1.y << "), (" << p2.x << "," 
	<< p2.y << "), (" << p3.x << "," << p3.y << "), (" << p4.x 
	<< "," << p4.y << ")" << endl;
}