Write a Java program for a Customer Relationship Management(CRM) system with the following features (P.S GUI INTERFACE): Customer: Name, Surname, ID (incremental ID by 1 for each new customer), Email, Phone, Address. Service: ID (incremental ID by1 for each group),CustomerID, Priority (High, Medium, Low, Other), ResolutionTimeFrame (Measured in Man hours), AssignedUser, Status(resolved or not), Fee. User (simple user of system): ID, Name, Surname, Username and Password (insert from code five fixed users), Address , PhoneNumber Manager: Name, Surname, Username and Password (insert from code one fixed manager). The program must: Present a Menu for the simple user after he has logged in with username and password. Menu: New Service New customer

Assign a service request to a specific user; Remove Service. Resolve Service Print information for customer with a certain ID Apply offers to the different type of customers.(Apply offer to the Loyal Customer with 10% discount on the fee) Overall number of Services requested by customers assigned to a user with a certain username. (requires manager password) Total amount of all fees of resolved Services processed by the user with a certain username (requires manager password). Total amount of all fees of resolved Services on the current day (requires manager password).

Change user from one to another (Each user should manage its own portfolio of customers) Change from User to Manager Change from Manager to User Exit

After implementation of the first phase start to include the following specifications: For the classes Customer and Services make sure you use a static integer field for the incremental ID of the objects of these classes. Introduce inheritance in the project design with the following: a. Add a new class Person class: with the following attributes; Name Surname ID Username Password Address PhoneNumber Classes inheriting from Person: i. Manager: has two additional features more than the Person called InternalPhoneNumber and PIN to start the software at the beginning of the day. ii. User: has these fields more than Person: InternalPhoneNumber, baseSalary.

b) Classes inheriting from Customer class The following types of Customer exists. i. SimpleCustomer ii. Class LoyalCustomer which has additional features: IndividualID and Discount. The manager inserts the discount amount periodically. (It may be also 0 ) iii. Class BusinessCustomer, which has additional features more than Customer, called Business ID(NIPT) and has an additional feature more than LoyalCustomer called BusinessDiscount. The manager will define the amount of BusinessDiscount. The overall discount is calculated as Discount + BusinessDiscount.

Define the following methods in all classes: calculateTotalFee( ) : Calculate the Total fee with the discount for each of these classes PrintInfo( ): Print all the information of the Service