'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var gLite = require('@antv/g-lite');

var MutationRecord = /*#__PURE__*/function () {
  MutationRecord.copy = function copy(original) {
    var record = new MutationRecord(original.type, original.target);
    record.addedNodes = original.addedNodes.slice();
    record.removedNodes = original.removedNodes.slice();
    record.previousSibling = original.previousSibling;
    record.nextSibling = original.nextSibling;
    record.attributeName = original.attributeName;
    record.attributeNamespace = original.attributeNamespace;
    record.oldValue = original.oldValue;
    return record;
  };
  function MutationRecord(type, target) {
    this.type = void 0;
    this.target = void 0;
    this.addedNodes = [];
    this.attributeName = null;
    this.attributeNamespace = null;
    this.nextSibling = null;
    this.oldValue = null;
    this.previousSibling = null;
    this.removedNodes = [];
    this.type = type;
    this.target = target;
  }
  return MutationRecord;
}();

var uidCounter = 0;
var registrationsTable = new WeakMap();
var Registration = /*#__PURE__*/function () {
  function Registration(observer, target, options) {
    this.observer = void 0;
    this.target = void 0;
    this.options = void 0;
    this.transientObservedNodes = [];
    this.observer = observer;
    this.target = target;
    this.options = options;
  }
  var _proto = Registration.prototype;
  _proto.enqueue = function enqueue(record) {
    var records = this.observer.records;
    var length = records.length;
    // There are cases where we replace the last record with the new record.
    // For example if the record represents the same mutation we need to use
    // the one with the oldValue. If we get same record (this can happen as we
    // walk up the tree) we ignore the new record.
    if (records.length > 0) {
      var lastRecord = records[length - 1];
      var recordToReplaceLast = selectRecord(lastRecord, record);
      if (recordToReplaceLast) {
        records[length - 1] = recordToReplaceLast;
        return;
      }
    } else {
      scheduleCallback(this.observer);
    }
    records[length] = record;
  };
  _proto.addListeners = function addListeners() {
    this.addListeners_(this.target);
  };
  _proto.addListeners_ = function addListeners_(node) {
    var options = this.options;
    if (options.attributes) node.addEventListener(gLite.ElementEvent.ATTR_MODIFIED, this, true);
    // if (options.characterData) node.addEventListener('DOMCharacterDataModified', this, true);
    if (options.childList) node.addEventListener(gLite.ElementEvent.INSERTED, this, true);
    if (options.childList || options.subtree) node.addEventListener(gLite.ElementEvent.REMOVED, this, true);
  };
  _proto.removeListeners = function removeListeners() {
    this.removeListeners_(this.target);
  };
  _proto.removeListeners_ = function removeListeners_(node) {
    var options = this.options;
    if (options.attributes) node.removeEventListener(gLite.ElementEvent.ATTR_MODIFIED, this, true);
    // if (options.characterData) node.removeEventListener('DOMCharacterDataModified', this, true);
    if (options.childList) node.removeEventListener(gLite.ElementEvent.INSERTED, this, true);
    if (options.childList || options.subtree) node.removeEventListener(gLite.ElementEvent.REMOVED, this, true);
  }
  /**
   * Adds a transient observer on node. The transient observer gets removed
   * next time we deliver the change records.
   */
  // addTransientObserver(node: IElement) {
  //   // Don't add transient observers on the target itself. We already have all
  //   // the required listeners set up on the target.
  //   if (node === this.target) return;
  //   this.addListeners_(node);
  //   this.transientObservedNodes.push(node);
  //   let registrations = registrationsTable.get(node);
  //   if (!registrations) registrationsTable.set(node, (registrations = []));
  //   // We know that registrations does not contain this because we already
  //   // checked if node === this.target.
  //   registrations.push(this);
  // }
  ;
  _proto.removeTransientObservers = function removeTransientObservers() {
    var transientObservedNodes = this.transientObservedNodes;
    this.transientObservedNodes = [];
    transientObservedNodes.forEach(function (node) {
      // Transient observers are never added to the target.
      this.removeListeners_(node);
      var registrations = registrationsTable.get(node);
      for (var i = 0; i < registrations.length; i++) {
        if (registrations[i] === this) {
          registrations.splice(i, 1);
          // Each node can only have one registered observer associated with
          // this observer.
          break;
        }
      }
    }, this);
  };
  _proto.handleEvent = function handleEvent(e) {
    // Stop propagation since we are managing the propagation manually.
    // This means that other mutation events on the page will not work
    // correctly but that is by design.
    e.stopImmediatePropagation();
    var record;
    var target;
    switch (e.type) {
      case gLite.ElementEvent.ATTR_MODIFIED:
        // http://dom.spec.whatwg.org/#concept-mo-queue-attributes
        var name = e.attrName;
        // @ts-ignore
        var namespace = e.relatedNode.namespaceURI;
        target = e.target;
        // 1.
        record = getRecord('attributes', target);
        record.attributeName = name;
        record.attributeNamespace = namespace;
        // 2.
        var oldValue = e.attrChange === gLite.MutationEvent.ADDITION ? null : e.prevValue;
        forEachAncestorAndObserverEnqueueRecord(target, function (options) {
          // 3.1, 4.2
          if (!options.attributes) return;
          // 3.2, 4.3
          if (options.attributeFilter && options.attributeFilter.length && options.attributeFilter.indexOf(name) === -1 && options.attributeFilter.indexOf(namespace) === -1) {
            return;
          }
          // 3.3, 4.4
          if (options.attributeOldValue) return getRecordWithOldValue(oldValue);
          // 3.4, 4.5
          return record;
        });
        break;
      // case 'DOMCharacterDataModified':
      //   // http://dom.spec.whatwg.org/#concept-mo-queue-characterdata
      //   var target = e.target;
      //   // 1.
      //   var record = getRecord('characterData', target);
      //   // 2.
      //   var oldValue = e.prevValue;
      //   forEachAncestorAndObserverEnqueueRecord(target, function(options) {
      //     // 3.1, 4.2
      //     if (!options.characterData)
      //       return;
      //     // 3.2, 4.3
      //     if (options.characterDataOldValue)
      //       return getRecordWithOldValue(oldValue);
      //     // 3.3, 4.4
      //     return record;
      //   });
      //   break;
      case gLite.ElementEvent.REMOVED:
      // this.addTransientObserver(e.target as IElement);
      // Fall through.
      case gLite.ElementEvent.INSERTED:
        // http://dom.spec.whatwg.org/#concept-mo-queue-childlist
        target = e.relatedNode;
        var changedNode = e.target;
        var addedNodes;
        var removedNodes;
        if (e.type === gLite.ElementEvent.INSERTED) {
          addedNodes = [changedNode];
          removedNodes = [];
        } else {
          addedNodes = [];
          removedNodes = [changedNode];
        }
        var previousSibling = changedNode.previousSibling;
        var nextSibling = changedNode.nextSibling;
        // 1.
        record = getRecord('childList', target);
        record.addedNodes = addedNodes;
        record.removedNodes = removedNodes;
        record.previousSibling = previousSibling;
        record.nextSibling = nextSibling;
        forEachAncestorAndObserverEnqueueRecord(target, function (options) {
          // 2.1, 3.2
          if (!options.childList) return;
          // 2.2, 3.3
          return record;
        });
    }
    clearRecords();
  };
  return Registration;
}();
/**
 * @see https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver
 * @see https://github.com/googlearchive/MutationObservers/blob/master/MutationObserver.js
 */
var MutationObserver = /*#__PURE__*/function () {
  function MutationObserver(callback) {
    this.callback = void 0;
    this.nodes = [];
    this.records = [];
    this.uid = uidCounter++;
    this.callback = callback;
  }
  var _proto2 = MutationObserver.prototype;
  _proto2.observe = function observe(target, options) {
    // 1.1
    if (!options.childList && !options.attributes && !options.characterData ||
    // 1.2
    options.attributeOldValue && !options.attributes ||
    // 1.3
    options.attributeFilter && options.attributeFilter.length && !options.attributes ||
    // 1.4
    options.characterDataOldValue && !options.characterData) {
      throw new SyntaxError();
    }
    var registrations = registrationsTable.get(target);
    if (!registrations) registrationsTable.set(target, registrations = []);
    // 2
    // If target's list of registered observers already includes a registered
    // observer associated with the context object, replace that registered
    // observer's options with options.
    var registration;
    for (var i = 0; i < registrations.length; i++) {
      if (registrations[i].observer === this) {
        registration = registrations[i];
        registration.removeListeners();
        registration.options = options;
        break;
      }
    }
    // 3.
    // Otherwise, add a new registered observer to target's list of registered
    // observers with the context object as the observer and options as the
    // options, and add target to context object's list of nodes on which it
    // is registered.
    if (!registration) {
      registration = new Registration(this, target, options);
      registrations.push(registration);
      this.nodes.push(target);
    }
    registration.addListeners();
  };
  _proto2.disconnect = function disconnect() {
    var _this = this;
    this.nodes.forEach(function (node) {
      var registrations = registrationsTable.get(node);
      for (var i = 0; i < registrations.length; i++) {
        var registration = registrations[i];
        if (registration.observer === _this) {
          registration.removeListeners();
          registrations.splice(i, 1);
          // Each node can only have one registered observer associated with
          // this observer.
          break;
        }
      }
    }, this);
    this.records = [];
  };
  _proto2.takeRecords = function takeRecords() {
    var copyOfRecords = this.records;
    this.records = [];
    return copyOfRecords;
  };
  return MutationObserver;
}();
// We keep track of the two (possibly one) records used in a single mutation.
var currentRecord;
var recordWithOldValue;
/**
 * Creates a record without |oldValue| and caches it as |currentRecord| for
 * later use.
 */
function getRecord(type, target) {
  return currentRecord = new MutationRecord(type, target);
}
/**
 * Gets or creates a record with |oldValue| based in the |currentRecord|
 */
function getRecordWithOldValue(oldValue) {
  if (recordWithOldValue) return recordWithOldValue;
  recordWithOldValue = MutationRecord.copy(currentRecord);
  recordWithOldValue.oldValue = oldValue;
  return recordWithOldValue;
}
function clearRecords() {
  currentRecord = recordWithOldValue = undefined;
}
/**
 * Whether the record represents a record from the current
 * mutation event.
 */
function recordRepresentsCurrentMutation(record) {
  return record === recordWithOldValue || record === currentRecord;
}
/**
 * Selects which record, if any, to replace the last record in the queue.
 * This returns |null| if no record should be replaced.
 */
function selectRecord(lastRecord, newRecord) {
  if (lastRecord === newRecord) return lastRecord;
  // Check if the the record we are adding represents the same record. If
  // so, we keep the one with the oldValue in it.
  if (recordWithOldValue && recordRepresentsCurrentMutation(lastRecord)) return recordWithOldValue;
  return null;
}
function removeTransientObserversFor(observer) {
  observer.nodes.forEach(function (node) {
    var registrations = registrationsTable.get(node);
    if (!registrations) return;
    registrations.forEach(function (registration) {
      if (registration.observer === observer) registration.removeTransientObservers();
    });
  });
}
/**
 * This function is used for the "For each registered observer observer (with
 * observer's options as options) in target's list of registered observers,
 * run these substeps:" and the "For each ancestor ancestor of target, and for
 * each registered observer observer (with options options) in ancestor's list
 * of registered observers, run these substeps:" part of the algorithms. The
 * |options.subtree| is checked to ensure that the callback is called
 * correctly.
 *
 * @param {Node} target
 * @param {function(MutationObserverInit):MutationRecord} callback
 */
function forEachAncestorAndObserverEnqueueRecord(target, callback) {
  for (var node = target; node; node = node.parentNode) {
    var registrations = registrationsTable.get(node);
    if (registrations) {
      for (var j = 0; j < registrations.length; j++) {
        var registration = registrations[j];
        var options = registration.options;
        // Only target ignores subtree.
        if (node !== target && !options.subtree) continue;
        var record = callback(options);
        if (record) registration.enqueue(record);
      }
    }
  }
}
// This is used to ensure that we never schedule 2 callas to setImmediate
var isScheduled = false;
// Keep track of observers that needs to be notified next time.
var scheduledObservers = [];
/**
 * Schedules |dispatchCallback| to be called in the future.
 */
function scheduleCallback(observer) {
  scheduledObservers.push(observer);
  if (!isScheduled) {
    isScheduled = true;
    // setImmediate(dispatchCallbacks);
    if (typeof gLite.runtime.globalThis !== 'undefined') {
      gLite.runtime.globalThis.setTimeout(dispatchCallbacks);
    } else {
      dispatchCallbacks();
    }
  }
}
function dispatchCallbacks() {
  // http://dom.spec.whatwg.org/#mutation-observers
  isScheduled = false; // Used to allow a new setImmediate call above.
  var observers = scheduledObservers;
  scheduledObservers = [];
  // Sort observers based on their creation UID (incremental).
  observers.sort(function (o1, o2) {
    return o1.uid - o2.uid;
  });
  var anyNonEmpty = false;
  observers.forEach(function (observer) {
    // 2.1, 2.2
    var queue = observer.takeRecords();
    // 2.3. Remove all transient registered observers whose observer is mo.
    removeTransientObserversFor(observer);
    // 2.4
    if (queue.length) {
      // @ts-ignore
      observer.callback(queue, observer);
      anyNonEmpty = true;
    }
  });
  // 3.
  if (anyNonEmpty) dispatchCallbacks();
}

exports.MutationObserver = MutationObserver;
exports.MutationRecord = MutationRecord;
exports.Registration = Registration;