import SAPCAI
import SAPFoundation
import SwiftUI

/*
  Create the `CAIChannel` object by providing the channel id, channel token, and channel slug of your mobile channel. Values can be looked up in CAI platform.

  If you do not want to hardcode channel information on the client, you can retrieve a list of channels for a given Application ID with `CAIChannelService`.
*/
let caiChannel = CAIChannel(id: "<channelId>", token: "<channelToken>", slug: "<channelSlug>")

// Create CAI service config for a SAPURLSession and URL pointing to CAI API endpoint
let serviceConfig = CAIServiceConfig(urlSession: SAPURLSession(), host: URL(string:"<Example: https://api.cai.tools.sap>")!)
     
// Provide the message delivery object for polling
let polling: MessageDelivering = PollMessageDelivery(channelId: "<channelId>", serviceConfig: serviceConfig)
   
// Create CAIConversation object and use it as publisher
let dataPublisher = CAIConversation(config: serviceConfig, channel: caiChannel, messageDelivery: polling)

// Create view model for `AssistantView`
let viewModel = MessagingViewModel(publisher: dataPublisher)

// `NavigationView` must be present in your view hierachy as `AssistantView` makes use of `NavigationLink`
AssistantView()
  .navigationTitle(Text("Chat")) // if you are in navigation controller
  .environmentObject(viewModel)
  .environmentObject(ThemeManager.shared)
  .onDisappear {
    // you cannot rely on the fact that onDisappear will be called only
    // once because `AssistantView` might trigger further navigations
    // causing the `AssistantView` to disappear and re-appear.
    // Therefore cleanup logic should be handled elsewhere.
  })

let vc = MessagingViewController(MessagingViewModel(publisher: dataPublisher))

self.navigationController?.pushViewController(vc, animated: true)

viewModel.cancelSubscriptions()
dataPublisher.resetConversation()

SDImageCache.shared.clearMemory()
SDImageCache.shared.clearDisk(onCompletion: nil)

ThemeManager.shared.setCurrentTheme( .fiori(FioriColorPalette()) )

ThemeManager.shared.setCurrentTheme( .casual(CasualColorPalette()) )

service.loadPreferences(channel: channel) { result in
  DispatchQueue.main.async {
    switch result {
      case .success(let data):
        viewModel.menu = data?.menu
      case .failure:
        break
    }
  }
}