Base

// SPDX-License-Identifier: MIT pragma solidity ^0.8.20;

import "@openzeppelin/contracts/access/Ownable.sol";

contract AddressBook is Ownable(msg.sender) { // Define a private salt value for internal use string private salt = "value";

// Define a struct to represent a contact
struct Contact {
    uint id; // Unique identifier for the contact
    string firstName; // First name of the contact
    string lastName; // Last name of the contact
    uint[] phoneNumbers; // Array to store multiple phone numbers for the contact
}

// Array to store all contacts
Contact[] private contacts;

// Mapping to store the index of each contact in the contacts array using its ID
mapping(uint => uint) private idToIndex;

// Variable to keep track of the ID for the next contact
uint private nextId = 1;

// Custom error for when a contact is not found
error ContactNotFound(uint id);

// Function to add a new contact
function addContact(string calldata firstName, string calldata lastName, uint[] calldata phoneNumbers) external onlyOwner {
    // Create a new contact with the provided details and add it to the contacts array
    contacts.push(Contact(nextId, firstName, lastName, phoneNumbers));
    // Map the ID of the new contact to its index in the array
    idToIndex[nextId] = contacts.length - 1;
    // Increment the nextId for the next contact
    nextId++;
}

// Function to delete a contact by its ID
function deleteContact(uint id) external onlyOwner {
    // Get the index of the contact to be deleted
    uint index = idToIndex[id];
    // Check if the index is valid and if the contact with the provided ID exists
    if (index >= contacts.length || contacts[index].id != id) revert ContactNotFound(id);

    // Replace the contact to be deleted with the last contact in the array
    contacts[index] = contacts[contacts.length - 1];
    // Update the index mapping for the moved contact
    idToIndex[contacts[index].id] = index;
    // Remove the last contact from the array
    contacts.pop();
    // Delete the mapping entry for the deleted contact ID
    delete idToIndex[id];
}

// Function to retrieve a contact by its ID
function getContact(uint id) external view returns (Contact memory) {
    // Get the index of the contact
    uint index = idToIndex[id];
    // Check if the index is valid and if the contact with the provided ID exists
    if (index >= contacts.length || contacts[index].id != id) revert ContactNotFound(id);
    // Return the contact details
    return contacts[index];
}

// Function to retrieve all contacts
function getAllContacts() external view returns (Contact[] memory) {
    // Return the array of all contacts
    return contacts;
}

}