// function to add book
void Inventory::addBook() {
try{
Book temp = getBook();
for (vector<Book>::iterator it = books.begin(); it != books.end(); it++){
//Allow for duplicate titles but not ISBN's
if (it->getISBN() == temp.getISBN()) {
cout << "\nBook already in library\n\n";
return;
}
}
pushBook(temp);
cout << "\nAdded book:\n\n" << temp << endl << endl;
}
catch (exception &e){
cout << endl << e.what() << endl << endl;
}
}
//The following function uses a non-recursive method to traverse the tree, adding books into a stack array.
//As it comes back, it pops books from the stack and checks if they are the book to be sold. If they are, the quantity
//parameter is subtracted by 1. If there is only one left, the function removes the book from the binary search tree
//by rearranging it appropriately.
void Library::SellBookbyISBN(Book *tmp, string aISBN) {
//If there are no Books
if (root == NULL) {
cout << "There are no books in the library." << endl;
}
//If there is only one Book
else if (tmp->getLeft() == 0 && tmp->getRight() == 0) {
cout << "Only one book in the library." << endl;
cout << "$" << tmp->getPrice() << " " << tmp->getTitle() << " by " << tmp->getAuthor() << endl;
}
else {
Book *stack[200];
int L = 0;
Book *current = tmp;
bool done = false;
while (done == false) {
if (current != NULL) {
stack[L] = current;
L++;
current = current->getLeft(current);
}
else {
if (L != 0 && current == NULL) {
L--;
current = stack[L];
if (current->getISBN() == aISBN) {
if (current->getQuantity() == 1) {
Book* parent = stack[L-1];
cout << "Oh, looks like you are selling the last one. Removing from tree." << endl;
if (current->getLeft() == NULL && current->getRight() == NULL) {
if (current->getPrice() > parent->getPrice()) {
parent->setRight(NULL);
}
else {
parent->setLeft(NULL);
}
}
else if (current->getLeft() != NULL && current->getRight() == NULL) {
if (current->getPrice() > parent->getPrice()) {
parent->setRight(current->getLeft());
}
else {
parent->setLeft(current->getRight());
}
}
else if (current->getLeft() == NULL && current->getRight() != NULL) {
if (current->getPrice() > parent->getPrice()) {
parent->setRight(current->getRight());
}
else {
parent->setLeft(current->getLeft());
}
}
else if (current->getLeft() != NULL && current->getRight() != NULL) {
Book* prev = predecessor(current->getPrice(), current);
if (prev == NULL) {
prev = successor(current->getPrice(), current);
}
if (prev->getPrice() > prev->getParent()->getPrice()) {
prev->getParent()->setRight(prev->getRight());
}
else if (prev->getPrice() <= prev->getParent()->getPrice()) {
prev->getParent()->setLeft(prev->getRight());
}
current->setPrice(prev->getPrice());
delete prev;
}
}
else {
int new_quant = current->getQuantity()-1;
current->setQuantity(new_quant);
cout << "$" << current->getPrice() << " " << current->getTitle() << " by " << current->getAuthor() << endl;
cout << "New quantity: " << current->getQuantity() << endl;
}
}
current = current->getRight(current);
}
else {
done = true;
}
}
}
}
}
int main()
{
Book bookshelf;
Member listofmembers;
string file1;
string file2;
int numberofbooks;
int numberofmembers;
bool program = false;
int choice1 = 0;
int choice2=0;
bool files=false;
///////////// Reading in Files//////////////
while(files == false)
{
cout << "Please enter books.txt"<< endl;
cin >> file1;
cout <<"Please enter ratings.txt"<< endl;
cin >> file2;
numberofbooks = readBookfile(file1, bookshelf);
numberofmembers=readRatingfile(file2, numberofbooks, listofmembers);
if(numberofbooks == 0 or numberofmembers == 0)
{cout << "Unable to read files. Please enter usuable files."<< endl;
}
else
{
files =true;
}
}
///////////////Running Program/////////////
program = true;
bool login= false;
while(program == true){
cout << endl<<"Welcome to the Book Recommender!"<<endl; //Welcome screen
cout << "Select an opion below:"<<endl;
cout <<"1) Login:"******"2) Add new member:"<<endl<<"3) Add new book:"<< endl << "4) Quit"<<endl;
cin >> choice1;
while (choice1>4){
cout << "Please select a choice from above. Idoit." <<endl;
cin >> choice1;}
while(choice1 == 1){//login
string name;
int ID;
Rating rateobject;
if(login==false){
cout<< "Please enter user ID"<< endl;
cin >>ID;
while (ID> numberofmembers){
cout<<"That user doesn't exsist! Please enter a valid user ID."<<endl;
cin >>ID;
}
login =true;
}
name= listofmembers.getName(ID);
rateobject=listofmembers.getMemberRating(ID);
cout << endl<<"Welcome " <<name<< "!"<< endl;
cout<< "Select an opion below." << endl;
cout<< "1) Rate book"<<endl<<"2) View your ratings"<<endl<<"3) Recommend Books"<<endl<<"4) Logout"<<endl;
cin>>choice2;
while(choice2 >4){
cout << "Please select a choice from above like how hard is it come on?"<<endl;
cin >> choice2;}
/////////logged in functions
while(choice2 == 1){//rate book
string YorN= "y";
int bookchoice=0;
int bookrate=0;
while(YorN == "y")
{
cout << "Here are the books avalible to rate:" <<endl;
for(int i=0; i < numberofbooks; i++){
cout<< bookshelf.getISBN(i)<<") "<< bookshelf.getTitle(i)<<endl;
}
cout<< "Enter the number of the book to rate: "<< endl;
cin >> bookchoice;
cout << "What would you give this book? (-5, -3, 0, 1, 3, 5)"<<endl;
cin >>bookrate;
listofmembers.getMemberRating(ID).setrating(bookchoice, bookrate);
cout<< "Would you like to rate another book?(y/n)"<<endl;
cin>>YorN;
}
if (YorN != "n"){
cout << "Please enter y or n. " << endl;
cin >> YorN;
}
else{
choice2=0;
}
}
