function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _defineProperties(e, r) { for (var t = 0; t < r.length; t++) { var o = r[t]; o.enumerable = o.enumerable || !1, o.configurable = !0, "value" in o && (o.writable = !0), Object.defineProperty(e, _toPropertyKey(o.key), o); } }
function _createClass(e, r, t) { return r && _defineProperties(e.prototype, r), t && _defineProperties(e, t), Object.defineProperty(e, "prototype", { writable: !1 }), e; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
function _classCallCheck(a, n) { if (!(a instanceof n)) throw new TypeError("Cannot call a class as a function"); }
function _callSuper(t, o, e) { return o = _getPrototypeOf(o), _possibleConstructorReturn(t, _isNativeReflectConstruct() ? Reflect.construct(o, e || [], _getPrototypeOf(t).constructor) : o.apply(t, e)); }
function _possibleConstructorReturn(t, e) { if (e && ("object" == _typeof(e) || "function" == typeof e)) return e; if (void 0 !== e) throw new TypeError("Derived constructors may only return object or undefined"); return _assertThisInitialized(t); }
function _assertThisInitialized(e) { if (void 0 === e) throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); return e; }
function _isNativeReflectConstruct() { try { var t = !Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); } catch (t) {} return (_isNativeReflectConstruct = function _isNativeReflectConstruct() { return !!t; })(); }
function _getPrototypeOf(t) { return _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf.bind() : function (t) { return t.__proto__ || Object.getPrototypeOf(t); }, _getPrototypeOf(t); }
function _inherits(t, e) { if ("function" != typeof e && null !== e) throw new TypeError("Super expression must either be null or a function"); t.prototype = Object.create(e && e.prototype, { constructor: { value: t, writable: !0, configurable: !0 } }), Object.defineProperty(t, "prototype", { writable: !1 }), e && _setPrototypeOf(t, e); }
function _setPrototypeOf(t, e) { return _setPrototypeOf = Object.setPrototypeOf ? Object.setPrototypeOf.bind() : function (t, e) { return t.__proto__ = e, t; }, _setPrototypeOf(t, e); }
import { EditorState, Plugin, PluginKey } from 'prosemirror-state';
import { Transform } from 'prosemirror-transform';
import { Decoration, DecorationSet } from 'prosemirror-view';
var PLACE_HOLDER_ID = {
  name: 'CursorPlaceholderPlugin'
};
var singletonInstance = null;

// https://prosemirror.net/examples/upload/
var SPEC = {
  // [FS] IRAD-1005 2020-07-07
  // Upgrade outdated packages.
  key: new PluginKey('CursorPlaceholderPlugin'),
  state: {
    init: function init() {
      return DecorationSet.empty;
    },
    apply: function apply(tr, set) {
      set = set.map(tr.mapping, tr.doc);
      var action = tr.getMeta(this);
      if (!action) {
        return set;
      }
      if (action.add) {
        var widget = document.createElement('czi-cursor-placeholder');
        widget.className = 'czi-cursor-placeholder';
        var deco = Decoration.widget(action.add.pos, widget, {
          id: PLACE_HOLDER_ID
        });
        set = set.add(tr.doc, [deco]);
      } else if (action.remove) {
        var found = set.find(null, null, specFinder);
        set = set.remove(found);
      }
      return set;
    }
  },
  props: {
    decorations: function decorations(state) {
      var plugin = singletonInstance;
      return plugin ? plugin.getState(state) : null;
    }
  }
};
var CursorPlaceholderPlugin = /*#__PURE__*/function (_Plugin) {
  function CursorPlaceholderPlugin() {
    var _this;
    _classCallCheck(this, CursorPlaceholderPlugin);
    _this = _callSuper(this, CursorPlaceholderPlugin, [SPEC]);
    if (singletonInstance) {
      return _possibleConstructorReturn(_this, singletonInstance);
    }
    singletonInstance = _this;
    return _this;
  }
  _inherits(CursorPlaceholderPlugin, _Plugin);
  return _createClass(CursorPlaceholderPlugin);
}(Plugin);
function specFinder(spec) {
  return spec.id === PLACE_HOLDER_ID;
}
function findCursorPlaceholderPos(state) {
  if (!singletonInstance) {
    return null;
  }
  var decos = singletonInstance.getState(state);
  var found = decos.find(null, null, specFinder);
  var pos = found.length ? found[0].from : null;
  return pos || null;
}
export function showCursorPlaceholder(state) {
  var plugin = singletonInstance;
  var tr = state.tr;
  if (!plugin || !tr.selection) {
    return tr;
  }
  var pos = findCursorPlaceholderPos(state);
  if (pos === null) {
    if (!tr.selection.empty) {
      // Replace the selection with a placeholder.
      tr = tr.deleteSelection();
    }
    tr = tr.setMeta(plugin, {
      add: {
        pos: tr.selection.from
      }
    });
  }
  return tr;
}
export function hideCursorPlaceholder(state) {
  var plugin = singletonInstance;
  var tr = state.tr;
  if (!plugin) {
    return tr;
  }
  var pos = findCursorPlaceholderPos(state);
  if (pos !== null) {
    tr = tr.setMeta(plugin, {
      remove: {}
    });
  }
  return tr;
}
export default CursorPlaceholderPlugin;