address_book_refactored.py

"""
**************************************
 ADDRESS BOOK (REFACTORED VERSION)
 Behavior preserved, design improved
**************************************
"""

from datetime import datetime


class AddressBook:
    def __init__(self, clock=None):
        self.contacts = []
        self.last_id = 0
        self.clock = clock or (lambda: datetime.now().isoformat())

    def add_contact(self, name, phone, email, address):
        if not name or not phone:
            return False

        if any(c["phone"] == phone for c in self.contacts):
            return False

        self.last_id += 1

        self.contacts.append({
            "id": self.last_id,
            "name": name,
            "phone": phone,
            "email": email or "",
            "address": address or "",
            "created_at": self.clock()
        })

        return True

    def get_all_contacts(self):
        return list(self.contacts)

    def find_contact_by_phone(self, phone):
        if not phone:
            return None
        return next((c for c in self.contacts if c["phone"] == phone), None)

    def update_contact(self, phone, new_name, new_email, new_address):
        contact = self.find_contact_by_phone(phone)
        if not contact:
            return False

        if new_name:
            contact["name"] = new_name
        if new_email:
            contact["email"] = new_email
        if new_address:
            contact["address"] = new_address

        contact["updated_at"] = self.clock()
        return True

    def delete_contact(self, phone):
        contact = self.find_contact_by_phone(phone)
        if not contact:
            return False

        self.contacts.remove(contact)
        return True

    def search_contacts(self, keyword):
        if not keyword:
            return []

        return [
            c for c in self.contacts
            if keyword in c["name"]
            or keyword in c["phone"]
            or keyword in c["email"]
        ]


# ---------- Backward-compatible API ----------
_book = AddressBook()

def add_contact(*args):
    return _book.add_contact(*args)

def get_all_contacts():
    return _book.get_all_contacts()

def find_contact_by_phone(phone):
    return _book.find_contact_by_phone(phone)

def update_contact(*args):
    return _book.update_contact(*args)

def delete_contact(phone):
    return _book.delete_contact(phone)

def search_contacts(keyword):
    return _book.search_contacts(keyword)