All files library.js

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const Transaction = require("./transaction");
 
class Library {
    constructor(inventory, transactionManager) {
        this.inventory = inventory;
        this.transactionManager = transactionManager;
    }
 
    borrowBook(ISBN, borrowedDate) {
        if (this.inventory.isAvailable(ISBN)) {
            let book = this.inventory.findBookByISBN('002-555-362');
            let initTransaction = new Transaction(book, borrowedDate);
            
            let borrowedTransaction = this.transactionManager.logBorrowTransaction(initTransaction);
            this.inventory.reduceCopy(ISBN);
 
            return borrowedTransaction;
        }else{
            throw new Error("Book isn't available");           
        }
    }
 
    returnBook(ISBN, transactionID) {
        const returnedBookTransaction = this.transactionManager.logReturnTransaction(transactionID);        
        this.inventory.increaseCopy(ISBN);
 
        return returnedBookTransaction;
    }
}
 
module.exports = Library;