Contact class

Contact.swift

//
//  Contact.swift
//  Debtly
//
//  Created by Tobias Feistmantl on 17/01/16.
//  Copyright © 2016 Tobias Feistmantl. All rights reserved.
//

import Foundation
import Contacts
import PhoneNumberKit

class Contact {
    private static let contactStore = CNContactStore()
    private static let predicate = CNContact.predicateForContactsInContainerWithIdentifier(contactStore.defaultContainerIdentifier())
    private static let keysToFetch = [
        CNContactFormatter.descriptorForRequiredKeysForStyle(.FullName),
        CNContactPhoneNumbersKey
    ]
    
    private static var _allContacts: [CNContact]?
    static func allContactsAsync(completionHandler: ([CNContact]?) -> Void) {
        if _allContacts == nil {
            contactStore.requestAccessForEntityType(CNEntityType.Contacts) { granted, error in
                if granted {
                    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)) {
                        _allContacts = try? self.contactStore.unifiedContactsMatchingPredicate(predicate, keysToFetch: keysToFetch)
                        
                        dispatch_async(dispatch_get_main_queue()) {
                            completionHandler(_allContacts)
                        }
                    }
                } else {
                    print("Not granted! Error: \(error)")
                    
                    completionHandler(_allContacts)
                }
            }
        } else {
            completionHandler(_allContacts)
        }
    }
    
    static var allContacts: [CNContact]? {
        if _allContacts == nil {
            _allContacts = try? self.contactStore.unifiedContactsMatchingPredicate(predicate, keysToFetch: keysToFetch)
        }
        
        return _allContacts
    }
    
    static func contactsWithPhoneNumberAsync(phoneNumber: PhoneNumber, completionHandler: ([CNContact]?) -> Void) {
        var matchedContacts: [CNContact]?
        
        allContactsAsync { contacts in
            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)) {
                if let contacts = contacts {
                    matchedContacts = []
                    
                    for contact in contacts {
                        for number in contact.phoneNumbers {
                            let n = try? PhoneNumber(rawNumber: (number.value as! CNPhoneNumber).stringValue)
                            
                            if let number = n {
                                if number.toE164() == phoneNumber.toE164() {
                                    matchedContacts?.append(contact)
                                }
                            }
                        }
                    }
                }
                
                dispatch_async(dispatch_get_main_queue()) {
                    completionHandler(matchedContacts)
                }
            }
        }
    }
    
    static func contactsWithPhoneNumber(phoneNumber: PhoneNumber) -> [CNContact]? {
        var matchedContacts: [CNContact]?
        
        if let contacts = allContacts {
            matchedContacts = []
            
            for contact in contacts {
                for number in contact.phoneNumbers {
                    let n = try? PhoneNumber(rawNumber: (number.value as! CNPhoneNumber).stringValue)
                    
                    if let number = n {
                        if number.toE164() == phoneNumber.toE164() {
                            matchedContacts?.append(contact)
                        }
                    }
                }
            }
        }
        
        return matchedContacts
    }
    
    static func contactWithIdentifier(identifier: String) -> CNContact? {
        return try? contactStore.unifiedContactWithIdentifier(identifier, keysToFetch: keysToFetch)
    }
}