//
//  CBPeripheral.swift
//  xDripG5
//
//  Copyright © 2017 LoopKit Authors. All rights reserved.
//

import CoreBluetooth


// MARK: - Discovery helpers.
extension CBPeripheral {
    func servicesToDiscover(from serviceUUIDs: [CBUUID]) -> [CBUUID] {
        let knownServiceUUIDs = services?.compactMap({ $0.uuid }) ?? []
        return serviceUUIDs.filter({ !knownServiceUUIDs.contains($0) })
    }

    func characteristicsToDiscover(from characteristicUUIDs: [CBUUID], for service: CBService) -> [CBUUID] {
        let knownCharacteristicUUIDs = service.characteristics?.compactMap({ $0.uuid }) ?? []
        return characteristicUUIDs.filter({ !knownCharacteristicUUIDs.contains($0) })
    }
}


extension Collection where Element: CBAttribute {
    func itemWithUUID(_ uuid: CBUUID) -> Element? {
        for attribute in self {
            if attribute.uuid == uuid {
                return attribute
            }
        }

        return nil
    }
}