/*
 * jQuery Hotkeys Plugin
 * Copyright 2010, John Resig
 * Dual licensed under the MIT or GPL Version 2 licenses.
 *
 * Based upon the plugin by Tzury Bar Yochay:
 * http://github.com/tzuryby/hotkeys
 *
 * Original idea by:
 * Binny V A, http://www.openjs.com/scripts/events/keyboard_shortcuts/
 */

/*
 * One small change is: now keys are passed by object { keys: '...' }
 * Might be useful, when you want to pass some other data to your handler
 */

function initHotKeyPluggin(jQuery) {
  jQuery.hotkeys = {
    version: '0.8',

    specialKeys: {
      8: 'backspace',
      9: 'tab',
      10: 'return',
      13: 'enter',
      16: 'shift',
      17: 'ctrl',
      18: 'alt',
      19: 'pause',
      20: 'capslock',
      27: 'esc',
      32: 'space',
      33: 'pageup',
      34: 'pagedown',
      35: 'end',
      36: 'home',
      37: 'left',
      38: 'up',
      39: 'right',
      40: 'down',
      45: 'insert',
      46: 'del',
      96: '0',
      97: '1',
      98: '2',
      99: '3',
      100: '4',
      101: '5',
      102: '6',
      103: '7',
      104: '8',
      105: '9',
      106: '*',
      107: '+',
      109: '-',
      110: '.',
      111: '/',
      112: 'f1',
      113: 'f2',
      114: 'f3',
      115: 'f4',
      116: 'f5',
      117: 'f6',
      118: 'f7',
      119: 'f8',
      120: 'f9',
      121: 'f10',
      122: 'f11',
      123: 'f12',
      144: 'numlock',
      145: 'scroll',
      186: ';',
      191: '/',
      220: '\\',
      222: "'",
      224: 'meta',
    },

    shiftNums: {
      '`': '~',
      1: '!',
      2: '@',
      3: '#',
      4: '$',
      5: '%',
      6: '^',
      7: '&',
      8: '*',
      9: '(',
      0: ')',
      '-': '_',
      '=': '+',
      ';': ': ',
      "'": '"',
      ',': '<',
      '.': '>',
      '/': '?',
      '\\': '|',
    },
  };

  function keyHandler(handleObj) {
    if (typeof handleObj.data === 'string') {
      handleObj.data = { keys: handleObj.data };
    }

    // Only care when a possible input has been specified
    if (!handleObj.data || !handleObj.data.keys || typeof handleObj.data.keys !== 'string') {
      return;
    }

    var origHandler = handleObj.handler,
      keys = handleObj.data.keys.toLowerCase().split(' '),
      textAcceptingInputTypes = [
        'text',
        'password',
        'number',
        'email',
        'url',
        'range',
        'date',
        'month',
        'week',
        'time',
        'datetime',
        'datetime-local',
        'search',
        'color',
        'tel',
      ];

    handleObj.handler = function (event) {
      // Don't fire in text-accepting inputs that we didn't directly bind to
      if (
        this !== event.target &&
        (/textarea|select/i.test(event.target.nodeName) ||
          jQuery.inArray(event.target.type, textAcceptingInputTypes) > -1)
      ) {
        return;
      }

      var special = jQuery.hotkeys.specialKeys[event.keyCode],
        character = String.fromCharCode(event.which).toLowerCase(),
        modif = '',
        possible = {};

      // check combinations (alt|ctrl|shift+anything)
      if (event.altKey && special !== 'alt') {
        modif += 'alt+';
      }

      if (event.ctrlKey && special !== 'ctrl') {
        modif += 'ctrl+';
      }

      // TODO: Need to make sure this works consistently across platforms
      if (event.metaKey && !event.ctrlKey && special !== 'meta') {
        modif += 'meta+';
      }

      if (event.shiftKey && special !== 'shift') {
        modif += 'shift+';
      }

      if (special) {
        possible[modif + special] = true;
      }

      if (character) {
        possible[modif + character] = true;
        possible[modif + jQuery.hotkeys.shiftNums[character]] = true;

        // "$" can be triggered as "Shift+4" or "Shift+$" or just "$"
        if (modif === 'shift+') {
          possible[jQuery.hotkeys.shiftNums[character]] = true;
        }
      }

      for (var i = 0, l = keys.length; i < l; i++) {
        if (possible[keys[i]]) {
          return origHandler.apply(this, arguments);
        }
      }
    };
  }

  jQuery.each(['keydown', 'keyup', 'keypress'], function () {
    jQuery.event.special[this] = { add: keyHandler };
  });
}

export default initHotKeyPluggin;