import Combine
import MPAKX
import SwiftUI

extension BusUI {
  public final class ManyTextField: ObservableObject {
    let textApp: String
    let textUI: String
    @Published public var id: String?
    @Published public var v = "a:"
    var sub = [AnyCancellable]()
    var subscriptions = [AnyCancellable]()
   
    public init(
      _ textApp: String,
      _ textUI: String
    ) {
      self.textApp = textApp
      self.textUI = textUI

      $id
        .sink { [weak self] id in self?.setup(id) }
        .store(in: &sub)
    }

    private func setup(_ id: String?) {
      subscriptions = []

      Bus.sendSync(
        textUI,
        $v
          .removeDuplicates()
          .compactMap { v -> Any? in
            guard
              let id,
              let text = onlyUIText(v)
            else {
              return nil
            }
            var d = [String: String]()
            d[id] = text
            return MPAK.Many([id], d)
          }
          .eraseToAnyPublisher(),
        &subscriptions
      )
   
      Bus.receiveSync(
        [textApp],
        { [weak self] (_, m: MPAK.Many<String>) in
          guard
            let id,
            m.keys.contains(id),
            let text = m.dict[id]
          else {
            return
          }
          self?.v = "a:\(text)"
        },
        &subscriptions
      )
    }
  }
}