Tusker/Tusker/Screens/Timeline/TimelinesPageViewController.swift

//
//  TimelinesPageViewController.swift
//  Tusker
//
//  Created by Shadowfacts on 9/14/19.
//  Copyright © 2019 Shadowfacts. All rights reserved.
//

import UIKit
import SwiftUI

class TimelinesPageViewController: SegmentedPageViewController<TimelinesPageViewController.Page> {

    private let homeTitle = NSLocalizedString("Home", comment: "home timeline tab title")
    private let federatedTitle = NSLocalizedString("Federated", comment: "federated timeline tab title")
    private let localTitle = NSLocalizedString("Local", comment: "local timeline tab title")
    
    weak var mastodonController: MastodonController!
    
    init(mastodonController: MastodonController) {
        self.mastodonController = mastodonController
        
        let home = TimelineViewController(for: .home, mastodonController: mastodonController)
        home.title = homeTitle
        home.persistsState = true
        
        let federated = TimelineViewController(for: .public(local: false), mastodonController: mastodonController)
        federated.title = federatedTitle
        federated.persistsState = true
        
        let local = TimelineViewController(for: .public(local: true), mastodonController: mastodonController)
        local.title = localTitle
        local.persistsState = true
        
        super.init(pages: [
            (.home, "Home", home),
            (.local, "Local", local),
            (.federated, "Federated", federated),
        ])
        
        title = homeTitle
        tabBarItem.image = UIImage(systemName: "house.fill")
        
        let filtersItem = UIBarButtonItem(image: UIImage(systemName: "line.3.horizontal.decrease.circle"), style: .plain, target: self, action: #selector(filtersPressed))
        filtersItem.accessibilityLabel = "Filters"
        navigationItem.leftBarButtonItem = filtersItem
        
        let jumpToPresentName = NSMutableAttributedString("Jump to Present")
        // otherwise it pronounces it as 'pɹizˈənt'
        // its IPA is also bad, this should be an alveolar approximant not a trill
        jumpToPresentName.addAttribute(.accessibilitySpeechIPANotation, value: "ˈprɛ.zənt", range: NSRange(location: "Jump to ".count, length: "Present".count))
        segmentedControl.accessibilityCustomActions = [
            UIAccessibilityCustomAction(attributedName: jumpToPresentName, actionHandler: { [unowned self] _ in
                guard let vc = pageControllers[currentIndex] as? TimelineViewController else {
                    return false
                }
                Task {
                    await vc.checkPresent(jumpImmediately: true)
                }
                return true
            })
        ]
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    func stateRestorationActivity() -> NSUserActivity? {
        return (pageControllers[currentIndex] as! TimelineViewController).stateRestorationActivity()
    }
    
    func restoreActivity(_ activity: NSUserActivity) {
        guard let timeline = UserActivityManager.getTimeline(from: activity) else {
            return
        }
        let page: Page
        switch timeline {
        case .home:
            page = .home
        case .public(local: false):
            page = .federated
        case .public(local: true):
            page = .local
        default:
            return
        }
        selectPage(page, animated: false)
    }
    
    @objc private func filtersPressed() {
        present(UIHostingController(rootView: FiltersView(mastodonController: mastodonController)), animated: true)
    }
    
    enum Page: Hashable {
        case home
        case local
        case federated
    }

}