import SwiftUI
import FoundationModels
import Observation

@Observable class ApplicationData {
   var response: AttributedString = ""
   var prompt: String = ""
   @ObservationIgnored var model: SystemLanguageModel
   @ObservationIgnored var session: LanguageModelSession

   static let shared: ApplicationData = ApplicationData()
   private init() {
      let bundle = Bundle.main
      if let adapterURL = bundle.url(forResource: "80sadapter", withExtension: "fmadapter") {
         do {
            let adapter = try SystemLanguageModel.Adapter(fileURL: adapterURL)
            model = SystemLanguageModel(adapter: adapter)
            session = LanguageModelSession(model: model)
         } catch {
            model = SystemLanguageModel.default
            session = LanguageModelSession(model: model)
         }
      } else {
         model = SystemLanguageModel.default
         session = LanguageModelSession(model: model)
      }
   }
   func sendPrompt() async {
      do {
         let answer = try await session.respond(to: prompt)
         var newResponse = AttributedString("\(answer.content)\n\n")
         newResponse.font = .system(size: 16, weight: .regular)
         response.append(newResponse)
      } catch {
         response = AttributedString("Error accessing the model: \(error)")
      }
      prompt = ""
   }
}