import Account
import DesignSystem
import Explore
import Foundation
import StatusKit
import SwiftUI

@MainActor
enum Tab: Int, Identifiable, Hashable, CaseIterable {
  case timeline, notifications, mentions, explore, messages, settings, other
  case trending, federated, local
  case profile
  case bookmarks
  case favorites
  case post

  nonisolated var id: Int {
    rawValue
  }

  static func loggedOutTab() -> [Tab] {
    [.timeline, .settings]
  }

  static func loggedInTabs() -> [Tab] {
    if UIDevice.current.userInterfaceIdiom == .pad ||
        UIDevice.current.userInterfaceIdiom == .mac {
      [.timeline, .trending, .federated, .local, .notifications, .mentions, .explore, .messages, .bookmarks, .favorites, .profile, .settings]
    } else if UIDevice.current.userInterfaceIdiom == .vision {
      [.profile, .timeline, .notifications, .mentions, .explore, .messages, .settings]
    } else {
      [.timeline, .notifications, .explore, .messages, .profile]
    }
  }

  @ViewBuilder
  func makeContentView(selectedTab: Binding<Tab>, popToRootTab: Binding<Tab>) -> some View {
    switch self {
    case .timeline:
      TimelineTab(popToRootTab: popToRootTab)
    case .trending:
      TimelineTab(popToRootTab: popToRootTab, timeline: .trending)
    case .local:
      TimelineTab(popToRootTab: popToRootTab, timeline: .local)
    case .federated:
      TimelineTab(popToRootTab: popToRootTab, timeline: .federated)
    case .notifications:
      NotificationsTab(selectedTab: selectedTab, popToRootTab: popToRootTab, lockedType: nil)
    case .mentions:
      NotificationsTab(selectedTab: selectedTab, popToRootTab: popToRootTab, lockedType: .mention)
    case .explore:
      ExploreTab(popToRootTab: popToRootTab)
    case .messages:
      MessagesTab(popToRootTab: popToRootTab)
    case .settings:
      SettingsTabs(popToRootTab: popToRootTab, isModal: false)
    case .profile:
      ProfileTab(popToRootTab: popToRootTab)
    case .bookmarks:
      NavigationTab {
        AccountStatusesListView(mode: .bookmarks)
      }
    case .favorites:
      NavigationTab {
        AccountStatusesListView(mode: .favorites)
      }
    case .post:
      VStack { }
    case .other:
      EmptyView()
    }
  }

  @ViewBuilder
  var label: some View {
    switch self {
    case .timeline:
      Label("tab.timeline", systemImage: iconName)
    case .trending:
      Label("tab.trending", systemImage: iconName)
    case .local:
      Label("tab.local", systemImage: iconName)
    case .federated:
      Label("tab.federated", systemImage: iconName)
    case .notifications:
      Label("tab.notifications", systemImage: iconName)
    case .mentions:
      Label("tab.mentions", systemImage: iconName)
    case .explore:
      Label("tab.explore", systemImage: iconName)
    case .messages:
      Label("tab.messages", systemImage: iconName)
    case .settings:
      Label("tab.settings", systemImage: iconName)
    case .profile:
      Label("tab.profile", systemImage: iconName)
    case .bookmarks:
      Label("accessibility.tabs.profile.picker.bookmarks", systemImage: iconName)
    case .favorites:
      Label("accessibility.tabs.profile.picker.favorites", systemImage: iconName)
    case .post:
      Label("menu.new-post", systemImage: iconName)
    case .other:
      EmptyView()
      
    }
  }

  var iconName: String {
    switch self {
    case .timeline:
      "rectangle.stack"
    case .trending:
      "chart.line.uptrend.xyaxis"
    case .local:
      "person.2"
    case .federated:
      "globe.americas"
    case .notifications:
      "bell"
    case .mentions:
      "at"
    case .explore:
      "magnifyingglass"
    case .messages:
      "tray"
    case .settings:
      "gear"
    case .profile:
      "person.crop.circle"
    case .bookmarks:
      "bookmark"
    case .favorites:
      "star"
    case .post:
      "square.and.pencil"
    case .other:
      ""
    }
  }
}

@Observable
class iOSTabs {
  enum TabEntries: String {
    case first, second, third, fourth, fifth
  }
  
  class Storage {
    @AppStorage(TabEntries.first.rawValue) var firstTab = Tab.timeline
    @AppStorage(TabEntries.second.rawValue) var secondTab = Tab.notifications
    @AppStorage(TabEntries.third.rawValue) var thirdTab = Tab.explore
    @AppStorage(TabEntries.fourth.rawValue) var fourthTab = Tab.messages
    @AppStorage(TabEntries.fifth.rawValue) var fifthTab = Tab.profile
  }
  
  private let storage = Storage()
  public static let shared = iOSTabs()
  
  var tabs: [Tab] {
    [firstTab, secondTab, thirdTab, fourthTab, fifthTab]
  }
  
  var firstTab: Tab {
    didSet {
      storage.firstTab = firstTab
    }
  }
  
  var secondTab: Tab {
    didSet {
      storage.secondTab = secondTab
    }
  }
  
  var thirdTab: Tab {
    didSet {
      storage.thirdTab = thirdTab
    }
  }
  
  var fourthTab: Tab {
    didSet {
      storage.fourthTab = fourthTab
    }
  }
  
  var fifthTab: Tab {
    didSet {
      storage.fifthTab = fifthTab
    }
  }
  
  private init() {
    firstTab = storage.firstTab
    secondTab = storage.secondTab
    thirdTab = storage.thirdTab
    fourthTab = storage.fourthTab
    fifthTab = storage.fifthTab
  }
}