//
//  UserActivityManager.swift
//  Tusker
//
//  Created by Shadowfacts on 10/19/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit
import Pachyderm

class UserActivityManager {
    
    // MARK: - Utils
    private static let encoder = PropertyListEncoder()
    private static let decoder = PropertyListDecoder()
    
    private static func present(_ vc: UIViewController, animated: Bool = true) {
        UIApplication.shared.delegate?.window??.rootViewController?.present(vc, animated: animated)
    }
    
    // MARK: - New Post
    static func newPostActivity(mentioning: Account? = nil) -> NSUserActivity {
        let activity = NSUserActivity(type: .newPost)
        activity.isEligibleForPrediction = true
        if let mentioning = mentioning {
            activity.userInfo = ["mentioning": mentioning.acct]
            activity.title = "Send a message to \(mentioning.realDisplayName)"
            activity.suggestedInvocationPhrase = "Send a message to \(mentioning.realDisplayName)"
        } else {
            activity.userInfo = [:]
            activity.title = "New Post"
            activity.suggestedInvocationPhrase = "Post in Tusker"
        }
        return activity
    }
    
    static func handleNewPost(activity: NSUserActivity) {
        // TODO: check not currently showing compose screen
        let mentioning = activity.userInfo?["mentioning"] as? String
        present(UINavigationController(rootViewController: ComposeViewController(mentioningAcct: mentioning)))
    }
    
    // MARK: - Check Notifications
    static func checkNotificationsActivity() -> NSUserActivity {
        let activity = NSUserActivity(type: .checkNotifications)
        activity.isEligibleForPrediction = true
        activity.title = "Check Notifications"
        activity.suggestedInvocationPhrase = "Check my Tusker notifications"
        return activity
    }
    
    static func handleCheckNotifications(activity: NSUserActivity) {
        let tabBarController = UIApplication.shared.keyWindow!.rootViewController! as! UITabBarController
        tabBarController.selectedIndex = 1
    }
    
    // MARK: - Show Timeline
    static func showTimelineActivity(timeline: Timeline) -> NSUserActivity? {
        guard let timelineData = try? encoder.encode(timeline) else { return nil }
        
        let activity = NSUserActivity(type: .showTimeline)
        activity.isEligibleForPrediction = true
        activity.userInfo = ["timelineData": timelineData]
        switch timeline {
        case .home:
            activity.title = NSLocalizedString("Show Home Timeline", comment: "home timeline shortcut title")
            activity.suggestedInvocationPhrase = NSLocalizedString("Show my home timeline", comment: "home timeline shortcut invocation phrase")
        case  .public(local: true):
            activity.title = NSLocalizedString("Show Local Timeline", comment: "local timeline shortcut title")
            activity.suggestedInvocationPhrase = NSLocalizedString("Show my local timeline", comment: "local timeline shortcut invocation phrase")
        case .public(local: false):
            activity.title = NSLocalizedString("Show Federated Timeline", comment: "federated timeline shortcut title")
            activity.suggestedInvocationPhrase = NSLocalizedString("Show my federated timeline", comment: "federated timeline invocation phrase")
        case let .tag(hashtag):
            activity.title = String(format: NSLocalizedString("Show #%@", comment: "show hashtag shortcut title"), hashtag)
            activity.suggestedInvocationPhrase = String(format: NSLocalizedString("Show the %@ hashtag", comment: "hashtag shortcut invocation phrase"), hashtag)
        case .list:
            // todo: add title to list
            activity.title = NSLocalizedString("Show List", comment: "list timeline shortcut title")
            activity.suggestedInvocationPhrase = NSLocalizedString("Show my list", comment: "list timeline invocation phrase")
        case .direct:
            activity.title = NSLocalizedString("Show Direct Messages", comment: "direct message timeline shortcut title")
            activity.suggestedInvocationPhrase = NSLocalizedString("Show my direct messages", comment: "direct message timeline invocation phrase")
        }
        return activity
    }
    
    static func handleShowTimeline(activity: NSUserActivity) {
        guard let timelineData = activity.userInfo?["timelineData"] as? Data,
            let timeline = try? decoder.decode(Timeline.self, from: timelineData) else {
                return
        }
        
        let tabBarController = UIApplication.shared.keyWindow!.rootViewController! as! UITabBarController
        tabBarController.selectedIndex = 0
        let navigationController = tabBarController.viewControllers![0] as! UINavigationController
        switch timeline {
        case .home, .public(true), .public(false):
            navigationController.popToRootViewController(animated: false)
            let rootController = navigationController.viewControllers.first! as! SegmentedPageViewController
            let index: Int
            switch timeline {
            case .home:
                index = 0
            case .public(false):
                index = 1
            case .public(true):
                index = 2
            default:
                fatalError()
            }
            rootController.segmentedControl.selectedSegmentIndex = index
            rootController.selectPage(at: index, animated: false)
        default:
            navigationController.pushViewController(TimelineTableViewController(for: timeline), animated: false)
        }
    }
    
}