var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

var defaultParagraphSeparatorString = 'defaultParagraphSeparator';
var formatBlock = 'formatBlock';
var addEventListener = function addEventListener(parent, type, listener)
{
  return parent.addEventListener(type, listener);
};
var appendChild = function appendChild(parent, child)
{
  return parent.appendChild(child);
};
var createElement = function createElement(tag)
{
  return document.createElement(tag);
};
var queryCommandState = function queryCommandState(command)
{
  return document.queryCommandState(command);
};
var queryCommandValue = function queryCommandValue(command)
{
  return document.queryCommandValue(command);
};

var exec = function exec(command)
{
  var value = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
  return document.execCommand(command, false, value);
};

var defaultActions = {
  bold: {
    icon: '<b>B</b>',
    title: 'Bold',
    state: function state()
    {
      return queryCommandState('bold');
    },
    result: function result()
    {
      return exec('bold');
    }
  },
  italic: {
    icon: '<i>I</i>',
    title: 'Italic',
    state: function state()
    {
      return queryCommandState('italic');
    },
    result: function result()
    {
      return exec('italic');
    }
  },
  underline: {
    icon: '<u>U</u>',
    title: 'Underline',
    state: function state()
    {
      return queryCommandState('underline');
    },
    result: function result()
    {
      return exec('underline');
    }
  },
  strikethrough: {
    icon: '<strike>S</strike>',
    title: 'Strike-through',
    state: function state()
    {
      return queryCommandState('strikeThrough');
    },
    result: function result()
    {
      return exec('strikeThrough');
    }
  },
  heading1: {
    icon: '<b>H<sub>1</sub></b>',
    title: 'Heading 1',
    result: function result()
    {
      return exec(formatBlock, '<h1>');
    }
  },
  heading2: {
    icon: '<b>H<sub>2</sub></b>',
    title: 'Heading 2',
    result: function result()
    {
      return exec(formatBlock, '<h2>');
    }
  },
  paragraph: {
    icon: '&#182;',
    title: 'Paragraph',
    result: function result()
    {
      return exec(formatBlock, '<p>');
    }
  },
  quote: {
    icon: '&#8220; &#8221;',
    title: 'Quote',
    result: function result()
    {
      return exec(formatBlock, '<blockquote>');
    }
  },
  olist: {
    icon: '<i class="fth-list"></i>',
    title: 'Ordered List',
    result: function result()
    {
      return exec('insertOrderedList');
    }
  },
  ulist: {
    icon: '<i class="fth-menu"></i>',
    title: 'Unordered List',
    result: function result()
    {
      return exec('insertUnorderedList');
    }
  },
  code: {
    icon: '&lt;/&gt;',
    title: 'Code',
    result: function result()
    {
      return exec(formatBlock, '<pre>');
    }
  },
  line: {
    icon: '<i class="fth-minus"></i>',
    title: 'Horizontal Line',
    result: function result()
    {
      return exec('insertHorizontalRule');
    }
  },
  link: {
    icon: '<i class="fth-link"></i>',
    title: 'Link',
    result: function result()
    {
      var url = window.prompt('Enter the link URL');
      if (url) exec('createLink', url);
    }
  },
  image: {
    icon: '&#128247;',
    title: 'Image',
    result: function result()
    {
      var url = window.prompt('Enter the image URL');
      if (url) exec('insertImage', url);
    }
  }
};

var defaultClasses = {
  actionbar: 'pell-actionbar',
  button: 'pell-button',
  content: 'pell-content',
  selected: 'pell-button-selected'
};

var init = function init(settings)
{
  var actions = settings.actions ? settings.actions.map(function (action)
  {
    if (typeof action === 'string') return defaultActions[action]; else if (defaultActions[action.name]) return _extends({}, defaultActions[action.name], action);
    return action;
  }) : Object.keys(defaultActions).map(function (action)
  {
    return defaultActions[action];
  });

  var classes = _extends({}, defaultClasses, settings.classes);

  var defaultParagraphSeparator = settings[defaultParagraphSeparatorString] || 'div';

  var actionbar = createElement('div');
  actionbar.className = classes.actionbar;
  appendChild(settings.element, actionbar);

  var content = settings.element.content = createElement('div');
  content.contentEditable = true;
  content.className = classes.content;
  content.oninput = function (_ref)
  {
    var firstChild = _ref.target.firstChild;

    if (firstChild && firstChild.nodeType === 3) exec(formatBlock, '<' + defaultParagraphSeparator + '>'); else if (content.innerHTML === '<br>') content.innerHTML = '';
    settings.onChange(content.innerHTML);
  };
  content.onkeydown = function (event)
  {
    if (event.key === 'Enter' && queryCommandValue(formatBlock) === 'blockquote')
    {
      setTimeout(function ()
      {
        return exec(formatBlock, '<' + defaultParagraphSeparator + '>');
      }, 0);
    }
  };
  appendChild(settings.element, content);

  actions.forEach(function (action)
  {
    var button = createElement('button');
    button.className = classes.button;
    button.innerHTML = action.icon;
    button.title = action.title;
    button.setAttribute('type', 'button');
    button.onclick = function ()
    {
      return action.result() && content.focus();
    };

    if (action.state)
    {
      var handler = function handler()
      {
        return button.classList[action.state() ? 'add' : 'remove'](classes.selected);
      };
      addEventListener(content, 'keyup', handler);
      addEventListener(content, 'mouseup', handler);
      addEventListener(button, 'click', handler);
    }

    appendChild(actionbar, button);
  });

  if (settings.styleWithCSS) exec('styleWithCSS');
  exec(defaultParagraphSeparatorString, defaultParagraphSeparator);

  return settings.element;
};


export default { exec, init };