//
//  NotificationHistoryPresenter.swift
//  GME Remit
//
//  Created by InKwon James Kim on 2020/02/11.
//Copyright © 2020 Gobal Money Express Co. Ltd. All rights reserved.
//

import RxSwift
import RxCocoa

class NotificationHistoryPresenter: ViewModelType {
  var interactor: NotificationHistoryInteractorInput?
  var wireframe: NotificationHistoryWireframeInput?
  
  struct Input {
    let viewWillAppear: Driver<Void>
    let selectNoticeIndex: Driver<Int>
  }
  
  struct Output {
    let isError: Driver<Error>
    let isProgress: Driver<Bool>
    let models: Driver<[NoticeModel]>
  }

  private let disposeBag = DisposeBag()
  
  private let progressLinker = PublishSubject<Bool>()
  private let errorLinker = PublishSubject<Error>()

  private let model = PublishSubject<[NoticeModel]>()
  
  func transform(input: Input) -> Output {
    
    input.viewWillAppear.drive(onNext: {[weak self] in
      self?.progressLinker.onNext(true)
      self?.interactor?.fetchNotices()
    }).disposed(by: disposeBag)
    
    input.selectNoticeIndex
      .withLatestFrom(model.asDriverOnErrorJustComplete()) { (indexPath, notices) -> NoticeModel in
        return notices[indexPath]
    }
    .drive(onNext: {[weak self] in
      self?.wireframe?.detail(index: $0.key ?? "")
    }).disposed(by: disposeBag)
      
    return Output(
      isError: errorLinker.asDriverOnErrorJustComplete(),
      isProgress: progressLinker.asDriverOnErrorJustComplete(),
      models: model.asDriverOnErrorJustComplete()
    )
  }
}

// MARK: NotificationHistory interactor output interface
extension NotificationHistoryPresenter: NotificationHistoryInteractorOutput {
  func setNotices(with model: [NoticeModel]) {
    progressLinker.onNext(false)
    self.model.onNext(model)
  }
  
  func setError(with error: Error) {
    progressLinker.onNext(false)
    errorLinker.onNext(error)
  }
}