import Contacts
import KNContacts

var contactBook = KNContactBook(id: "allContacts")

// Retrieve or create your CNContact list from a store - KNContacts does *not* handle authorisation for you.
// Make sure you have all necessary key descriptors.

var keys = [CNContactGivenNameKey, CNContactMiddleNameKey, CNContactFamilyNameKey,
            CNContactEmailAddressesKey, CNContactBirthdayKey, CNContactPhoneNumbersKey,
            CNContactFormatter.descriptorForRequiredKeys(for: .fullName)] as! [CNKeyDescriptor]

let requestForContacts = CNContactFetchRequest(keysToFetch: keys)

do {
    try CNContactStore().enumerateContacts(with: requestForContacts) { (cnContact, _) in
        let knContact = KNContact(cnContact)
        contactBook.add(knContact)
    }
} catch let error {
    // Handle error somehow!
    print(error)
}

// And then perform actions on KNContactBook
let randomContacts = contactBook.randomElements(number: 1)
let randomElements = contactBook.randomElements(number: 3, except: randomContacts)

randomElements.forEach({ (contact) in 
    print(contact.fullName(format: .fullName))
    if (contact.isBirthdayToday()) {
        print("It's their birthday today!")
    } else if (contact.isBirthdayComing(in: 7)) {
        print("Birthday coming up in the next week!")
    } else {
        print("Birthday on \(contact.formatBirthday())")
    }
})

let order = KNContactBookOrdering.thisYearsBirthday
let contactsSortedByBirthday = contactBook.contacts.sorted(by: order)

// And finally schedules can be created for easier retrieval at a later date.
var thisWeeksBirthdaySchedule = KNContactsSchedule(name: "birthdaysThisYear")

for numberOfDays in 1...7 {
    let birthdayList = contactsSortedByBirthday.filter({ $0.isBirthdayComing(in: numberOfDays) }).map({ $0.id })
    let date = Calendar.current.date(byAdding: .day, value: numberOfDays, to: Date())!
    let dateString = KNDatesUtils.formatter(with: .fullDate).string(from: date)
    thisWeeksBirthdaySchedule.add(list: birthdayList, to: dateString)
}

// And retrieve schedule by date
let tomorrow = Calendar.current.date(byAdding: .day, value: 1, to: Date())!
let schedule = thisWeeksBirthdaySchedule.getSchedule(for: tomorrow)

dependencies: [
    .package(url: "https://github.com/dragosrobertn/KNContacts.git", .upToNextMajor(from: "1.3.0"))
]