/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    The handler class for INSendMessageIntent.

*/

import Foundation

import Intents

import UnicornCore

class UCSendMessageIntentHandler: NSObject, INSendMessageIntentHandling {

    // MARK: 1. Resolve

    func resolveRecipients(forSendMessage intent: INSendMessageIntent, with completion: @escaping ([INPersonResolutionResult]) -> Swift.Void) {

        if let recipients = intent.recipients {

            var resolutionResults = [INPersonResolutionResult]()

            for recipient in recipients {

                let matchingContacts = UCAddressBookManager().contacts(matchingName: recipient.displayName)

                switch matchingContacts.count {

                    case 2 ... Int.max:

                        // We need Siri's help to ask user to pick one from the matches.

                        let disambiguationOptions: [INPerson] = matchingContacts.map { contact in

                            return contact.inPerson()

                        }

                        resolutionResults += [.disambiguation(with: disambiguationOptions)]

                    case 1:

                        let recipientMatched = matchingContacts[0].inPerson()

                        resolutionResults += [.success(with: recipientMatched)]

                    case 0:

                        resolutionResults += [.unsupported()]

                    default:

                        break

                }

            }

            completion(resolutionResults)

        } else {

            // No recipients are provided. We need to prompt for a value.

            completion([INPersonResolutionResult.needsValue()])

        }

    }

    func resolveContent(forSendMessage intent: INSendMessageIntent, with completion: @escaping (INStringResolutionResult) -> Swift.Void) {

        if let text = intent.content, !text.isEmpty {

            completion(INStringResolutionResult.success(with: text))

        }

        else {

            completion(INStringResolutionResult.needsValue())

        }

    }

    // MARK: 2. Confirm

    func confirm(sendMessage intent: INSendMessageIntent, completion: @escaping (INSendMessageIntentResponse) -> Swift.Void) {

        if UCAccount.shared().hasValidAuthentication {

            completion(INSendMessageIntentResponse(code: .success, userActivity: nil))

        }

        else {

            // Creating our own user activity to include error information.

            let userActivity = NSUserActivity(activityType: String(describing: INSendMessageIntent.self))

            userActivity.userInfo = [NSString(string: "error"):NSString(string: "UserLoggedOut")]

            completion(INSendMessageIntentResponse(code: .failureRequiringAppLaunch, userActivity: userActivity))

        }

    }

    // MARK: 3. Handle

    func handle(sendMessage intent: INSendMessageIntent, completion: @escaping (INSendMessageIntentResponse) -> Swift.Void) {

        if intent.recipients != nil && intent.content != nil {

            // Send the message.

            let success = UCAccount.shared().sendMessage(intent.content, toRecipients: intent.recipients)

            completion(INSendMessageIntentResponse(code: success ? .success : .failure, userActivity: nil))

        }

        else {

            completion(INSendMessageIntentResponse(code: .failure, userActivity: nil))

        }

    }

}