//Derek McQuay 647465151 CS 235 Fall 2012 midterm 1
#include "polyman.h"

PolynomialListInterface * polyman::addLists() {
    node * node_ptr1 = l1.head;
    node * node_ptr2 = l2.head;
    polylist l3;
    stringstream exp;
    while(node_ptr1 != NULL) {
        if(node_ptr1->coefficient != 0) {
            exp << node_ptr1->coefficient;
            exp << " ";
        }
        exp << node_ptr1->variable;
        if(node_ptr1->exponent != 0) {
            exp << " ^ ";
            exp << node_ptr1->exponent;
        }
        l3.insert(exp.str());
        exp.str("");
        node_ptr1 = node_ptr1->next;
    }
    while(node_ptr2 != NULL) {
        if(node_ptr2->coefficient != 0) {
            exp << node_ptr2->coefficient;
            exp << " ";
        }
        exp << node_ptr2->variable;
        if(node_ptr2->exponent != 0) {
            exp << " ^ ";
            exp << node_ptr2->exponent;
        }
        l3.insert(exp.str());
        exp.str("");
        node_ptr2 = node_ptr2->next;
    }
    polylist * p = NULL;
    p = &l3;
    return p;
}

PolynomialListInterface * polyman::subtractLists() {
    node * node_ptr1 = l1.head;
    node * node_ptr2 = l2.head;
    polylist l3;
    stringstream exp;
    while(node_ptr1 != NULL) {
        if(node_ptr1->coefficient != 0) {
            exp << node_ptr1->coefficient;
            exp << " ";
        }
        exp << node_ptr1->variable;
        if(node_ptr1->exponent != 0) {
            exp << " ^ ";
            exp << node_ptr1->exponent;
        }
        l3.insert(exp.str());
        exp.str("");
        node_ptr1 = node_ptr1->next;
    }
    while(node_ptr2 != NULL) {
        if(node_ptr2->coefficient != 0) {
            node_ptr2->coefficient = node_ptr2->coefficient * -1; // will cause it to be subtracting 
            exp << node_ptr2->coefficient;
            exp << " ";
        }
        exp << node_ptr2->variable;
        if(node_ptr2->exponent != 0) {
            exp << " ^ ";
            exp << node_ptr2->exponent;
        }
        l3.insert(exp.str());
        exp.str("");
        node_ptr2 = node_ptr2->next;
    }
    polylist * p = NULL;
    p = &l3;
    return p;
}

void polyman::fillListOne(string term) {
    l1.insert(term);
}

void polyman::fillListTwo(string term) {
    l2.insert(term);
}

void polyman::clearListOne() {
    l1.clear();
}

void polyman::clearListTwo() {
    l2.clear();
}

PolynomialListInterface * polyman::getListOne() {
    polylist * p = NULL;
    p = &l1;
    return p;
}

PolynomialListInterface * polyman::getListTwo() {
    polylist * p = NULL;
    p = &l2;
    return p;
}