/* 
Cody Cook
CS-320-H7022 Software Test Automation & QA 23EW2
2023/11/11
*/

import java.util.ArrayList;
import java.util.List;

public class ContactService {

	private List<Contact> contacts;

	public ContactService() {
		// Initialize the list of contacts
		this.contacts = new ArrayList<>();
	}

	public void addContact(Contact contact) {
		// Check if a contact with the same ID already exists
		if (getContactById(contact.getId()) != null) {
			throw new IllegalArgumentException("Contact with the same ID already exists.");
		}
		// Add the contact to the list
		contacts.add(contact);
	}

	public void deleteContact(String contactId) {
		// Find and remove the contact with the specified contactId
		boolean removed = contacts.removeIf(contact -> contact.getId().equals(contactId));
		if (!removed) {
			throw new IllegalArgumentException("Contact with ID " + contactId + " not found.");
		}
	}

	public void updateContact(String contactId, String newFirstName, String newLastName, String newPhone,
			String newAddress) {
		// Find the contact by ID
		Contact contactToUpdate = getContactById(contactId);

		if (contactToUpdate == null) {
			throw new IllegalArgumentException("Contact with ID " + contactId + " not found.");
		}

		// Update the contact's fields if new values are provided
		if (newFirstName != null) {
			contactToUpdate.setFirstName(newFirstName);
		}
		if (newLastName != null) {
			contactToUpdate.setLastName(newLastName);
		}
		if (newPhone != null) {
			contactToUpdate.setPhone(newPhone);
		}
		if (newAddress != null) {
			contactToUpdate.setAddress(newAddress);
		}
	}

	public Contact getContactById(String contactId) {
		// Find and return the contact with the specified ID, or null if not found
		for (Contact contact : contacts) {
			if (contact.getId().equals(contactId)) {
				return contact;
			}
		}
		return null;
	}

	public List<Contact> getAllContacts() {
		// Return a list of all contacts
		return new ArrayList<>(contacts);
	}
}