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

import Cocoa

class KeyUtils {

  static let specialKeys = [
    NSUpArrowFunctionKey: "Up",
    NSDownArrowFunctionKey: "Down",
    NSLeftArrowFunctionKey: "Left",
    NSRightArrowFunctionKey: "Right",
    NSInsertFunctionKey: "Insert",
    0x7F: "BS", // "delete"-key
    NSDeleteFunctionKey: "Del", // "Fn+delete"-key
    NSHomeFunctionKey: "Home",
    NSBeginFunctionKey: "Begin",
    NSEndFunctionKey: "End",
    NSPageUpFunctionKey: "PageUp",
    NSPageDownFunctionKey: "PageDown",
    NSHelpFunctionKey: "Help",
    NSF1FunctionKey: "F1",
    NSF2FunctionKey: "F2",
    NSF3FunctionKey: "F3",
    NSF4FunctionKey: "F4",
    NSF5FunctionKey: "F5",
    NSF6FunctionKey: "F6",
    NSF7FunctionKey: "F7",
    NSF8FunctionKey: "F8",
    NSF9FunctionKey: "F9",
    NSF10FunctionKey: "F10",
    NSF11FunctionKey: "F11",
    NSF12FunctionKey: "F12",
    NSF13FunctionKey: "F13",
    NSF14FunctionKey: "F14",
    NSF15FunctionKey: "F15",
    NSF16FunctionKey: "F16",
    NSF17FunctionKey: "F17",
    NSF18FunctionKey: "F18",
    NSF19FunctionKey: "F19",
    NSF20FunctionKey: "F20",
    NSF21FunctionKey: "F21",
    NSF22FunctionKey: "F22",
    NSF23FunctionKey: "F23",
    NSF24FunctionKey: "F24",
    NSF25FunctionKey: "F25",
    NSF26FunctionKey: "F26",
    NSF27FunctionKey: "F27",
    NSF28FunctionKey: "F28",
    NSF29FunctionKey: "F29",
    NSF30FunctionKey: "F30",
    NSF31FunctionKey: "F31",
    NSF32FunctionKey: "F32",
    NSF33FunctionKey: "F33",
    NSF34FunctionKey: "F34",
    NSF35FunctionKey: "F35",
  ]

  static func isSpecial(key key: String) -> Bool {
    guard key.characters.count == 1 else {
      return false
    }

    if let firstChar = key.utf16.first {
      return KeyUtils.specialKeys.keys.contains(Int(firstChar))
    }

    return false
  }

  static func namedKeyFrom(key key: String) -> String {
    if let firstChar = key.utf16.first {
      if KeyUtils.specialKeys.keys.contains(Int(firstChar)) {
        return KeyUtils.specialKeys[Int(firstChar)]!
      }
    }

    return key
  }
}