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

import Foundation

class PreviewToolReducer {

  typealias Pair = StateActionPair<UuidState<MainWindow.State>, PreviewTool.Action>

  init(baseServerUrl: URL) {
    self.baseServerUrl = baseServerUrl
  }

  func reduce(_ pair: Pair) -> Pair {
    var state = pair.state.payload

    switch pair.action {

    case .refreshNow:
      state.preview = PreviewUtils.state(for: pair.state.uuid,
                                         baseUrl: self.baseServerUrl,
                                         buffer: state.currentBuffer)

    case let .reverseSearch(to:position):
      state.preview.previewPosition = position
      state.preview.ignoreNextReverse = false
      state.preview.ignoreNextForward = true
      state.preview.forceNextReverse = true

    case let .scroll(to:position):
      state.preview.previewPosition = position
      state.preview.ignoreNextReverse = false
      state.preview.ignoreNextForward = true
      state.preview.forceNextReverse = false

    case let .setAutomaticReverseSearch(to:value):
      state.previewTool.isReverseSearchAutomatically = value

    case let .setAutomaticForwardSearch(to:value):
      state.previewTool.isForwardSearchAutomatically = value

    case let .setRefreshOnWrite(to:value):
      state.previewTool.isRefreshOnWrite = value

    }

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

  fileprivate let baseServerUrl: URL
}