/**
 * Tae Won Ha - http://taewon.de - @hataewon
 * See LICENSE
 */

import Foundation
import RxSwift

class AppearancePrefReducer: Reducer {

  typealias Pair = StateActionPair<AppState, AppearancePref.Action>

  func transform(_ source: Observable<Pair>) -> Observable<Pair> {
    return source.map { pair in
      var state = pair.state
      var appearance = state.mainWindowTemplate.appearance

      switch pair.action {

      case let .setUsesLigatures(value):
        appearance.usesLigatures = value

      case let .setFont(font):
        appearance.font = font

      case let .setLinespacing(linespacing):
        appearance.linespacing = linespacing

      }

      self.modify(state: &state, with: appearance)

      return StateActionPair(state: state, action: pair.action)
    }
  }

  fileprivate func modify(state: inout AppState, with appearance: AppearanceState) {
    state.mainWindowTemplate.appearance = appearance
    state.mainWindows.keys.forEach { state.mainWindows[$0]?.appearance = appearance }
  }
}