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

import Cocoa
import RxSwift
import PureLayout

class FileBrowser: NSView,
                   UiComponent {

  typealias StateType = MainWindow.State

  enum Action {

    case open(url: URL, mode: MainWindow.OpenMode)
    case setAsWorkingDirectory(URL)
    case setShowHidden(Bool)
  }

  let innerCustomToolbar = InnerCustomToolbar()
  let menuItems: [NSMenuItem]

  override var isFirstResponder: Bool {
    return self.fileView.isFirstResponder
  }

  required init(source: Observable<StateType>, emitter: ActionEmitter, state: StateType) {
    self.emit = emitter.typedEmit()
    self.uuid = state.uuid

    self.cwd = state.cwd

    self.fileView = FileOutlineView(source: source, emitter: emitter, state: state)

    self.showHiddenMenuItem = NSMenuItem(title: "Show Hidden Files",
                                        action: #selector(FileBrowser.showHiddenAction),
                                        keyEquivalent: "")
    showHiddenMenuItem.boolState = state.fileBrowserShowHidden
    self.menuItems = [
      showHiddenMenuItem,
    ]

    super.init(frame: .zero)

    self.addViews()
    self.showHiddenMenuItem.target = self
    self.innerCustomToolbar.fileBrowser = self

    source
      .observeOn(MainScheduler.instance)
      .subscribe(onNext: { [unowned self] state in
        if self.cwd != state.cwd {
          self.cwd = state.cwd
          self.innerCustomToolbar.goToParentButton.isEnabled = state.cwd.path != "/"
        }

        self.currentBufferUrl = state.currentBuffer?.url
        self.showHiddenMenuItem.boolState = state.fileBrowserShowHidden
      })
      .disposed(by: self.disposeBag)
  }

  fileprivate let emit: (UuidAction<Action>) -> Void
  fileprivate let disposeBag = DisposeBag()

  fileprivate let uuid: String

  fileprivate var currentBufferUrl: URL?

  fileprivate let fileView: FileOutlineView
  fileprivate let showHiddenMenuItem: NSMenuItem

  fileprivate var cwd: URL

  required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }

  fileprivate func addViews() {
    let scrollView = NSScrollView.standardScrollView()
    scrollView.borderType = .noBorder
    scrollView.documentView = self.fileView

    self.addSubview(scrollView)
    scrollView.autoPinEdgesToSuperviewEdges()
  }
}

extension FileBrowser {

  class InnerCustomToolbar: NSView {

    fileprivate weak var fileBrowser: FileBrowser? {
      didSet {
        self.goToParentButton.target = self.fileBrowser
        self.scrollToSourceButton.target = self.fileBrowser
      }
    }

    let goToParentButton = NSButton(forAutoLayout:())
    let scrollToSourceButton = NSButton(forAutoLayout:())

    init() {
      super.init(frame: .zero)
      self.configureForAutoLayout()

      self.addViews()
    }

    fileprivate func addViews() {
      let goToParent = self.goToParentButton
      InnerToolBar.configureToStandardIconButton(button: goToParent, iconName: .levelUp)
      goToParent.toolTip = "Set parent as working directory"
      goToParent.action = #selector(FileBrowser.goToParentAction)

      let scrollToSource = self.scrollToSourceButton
      InnerToolBar.configureToStandardIconButton(button: scrollToSource, iconName: .bullseye)
      scrollToSource.toolTip = "Navigate to the current buffer"
      scrollToSource.action = #selector(FileBrowser.scrollToSourceAction)

      self.addSubview(goToParent)
      self.addSubview(scrollToSource)

      goToParent.autoPinEdge(toSuperviewEdge: .top)
      goToParent.autoPinEdge(toSuperviewEdge: .right)
      scrollToSource.autoPinEdge(toSuperviewEdge: .top)
      scrollToSource.autoPinEdge(.right, to: .left, of: goToParent)
    }

    required init?(coder: NSCoder) {
      fatalError("init(coder:) has not been implemented")
    }
  }
}

// MARK: - Actions
extension FileBrowser {

  func showHiddenAction(_ sender: Any?) {
    guard let menuItem = sender as? NSMenuItem else {
      return
    }

    self.emit(UuidAction(uuid: self.uuid, action: .setShowHidden(!menuItem.boolState)))
  }

  func goToParentAction(_ sender: Any?) {
    self.emit(UuidAction(uuid: self.uuid, action: .setAsWorkingDirectory(self.cwd.parent)))
  }

  func scrollToSourceAction(_ sender: Any?) {
    guard let url = self.currentBufferUrl else {
      return
    }

    self.fileView.select(url)
  }
}