"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.EventEmitter = void 0;
/**
 * Copyright Joyent, Inc. and other Node contributors.
 * Modifications copyright (c) Microsoft Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to permit
 * persons to whom the Software is furnished to do so, subject to the
 * following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
 * NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

class EventEmitter {
  constructor(platform) {
    this._events = undefined;
    this._eventsCount = 0;
    this._maxListeners = undefined;
    this._pendingHandlers = new Map();
    this._rejectionHandler = void 0;
    this._platform = void 0;
    this._platform = platform;
    if (this._events === undefined || this._events === Object.getPrototypeOf(this)._events) {
      this._events = Object.create(null);
      this._eventsCount = 0;
    }
    this._maxListeners = this._maxListeners || undefined;
    this.on = this.addListener;
    this.off = this.removeListener;
  }
  setMaxListeners(n) {
    if (typeof n !== 'number' || n < 0 || Number.isNaN(n)) throw new RangeError('The value of "n" is out of range. It must be a non-negative number. Received ' + n + '.');
    this._maxListeners = n;
    return this;
  }
  getMaxListeners() {
    return this._maxListeners === undefined ? this._platform.defaultMaxListeners() : this._maxListeners;
  }
  emit(type, ...args) {
    const events = this._events;
    if (events === undefined) return false;
    const handler = events === null || events === void 0 ? void 0 : events[type];
    if (handler === undefined) return false;
    if (typeof handler === 'function') {
      this._callHandler(type, handler, args);
    } else {
      const len = handler.length;
      const listeners = handler.slice();
      for (let i = 0; i < len; ++i) this._callHandler(type, listeners[i], args);
    }
    return true;
  }
  _callHandler(type, handler, args) {
    const promise = Reflect.apply(handler, this, args);
    if (!(promise instanceof Promise)) return;
    let set = this._pendingHandlers.get(type);
    if (!set) {
      set = new Set();
      this._pendingHandlers.set(type, set);
    }
    set.add(promise);
    promise.catch(e => {
      if (this._rejectionHandler) this._rejectionHandler(e);else throw e;
    }).finally(() => set.delete(promise));
  }
  addListener(type, listener) {
    return this._addListener(type, listener, false);
  }
  on(type, listener) {
    return this._addListener(type, listener, false);
  }
  _addListener(type, listener, prepend) {
    checkListener(listener);
    let events = this._events;
    let existing;
    if (events === undefined) {
      events = this._events = Object.create(null);
      this._eventsCount = 0;
    } else {
      // To avoid recursion in the case that type === "newListener"! Before
      // adding it to the listeners, first emit "newListener".
      if (events.newListener !== undefined) {
        this.emit('newListener', type, unwrapListener(listener));

        // Re-assign `events` because a newListener handler could have caused the
        // this._events to be assigned to a new object
        events = this._events;
      }
      existing = events[type];
    }
    if (existing === undefined) {
      // Optimize the case of one listener. Don't need the extra array object.
      existing = events[type] = listener;
      ++this._eventsCount;
    } else {
      if (typeof existing === 'function') {
        // Adding the second element, need to change to array.
        existing = events[type] = prepend ? [listener, existing] : [existing, listener];
        // If we've already got an array, just append.
      } else if (prepend) {
        existing.unshift(listener);
      } else {
        existing.push(listener);
      }

      // Check for listener leak
      const m = this.getMaxListeners();
      if (m > 0 && existing.length > m && !existing.warned) {
        existing.warned = true;
        // No error code for this since it is a Warning
        const w = new Error('Possible EventEmitter memory leak detected. ' + existing.length + ' ' + String(type) + ' listeners ' + 'added. Use emitter.setMaxListeners() to ' + 'increase limit');
        w.name = 'MaxListenersExceededWarning';
        w.emitter = this;
        w.type = type;
        w.count = existing.length;
        if (!this._platform.isUnderTest()) {
          // eslint-disable-next-line no-console
          console.warn(w);
        }
      }
    }
    return this;
  }
  prependListener(type, listener) {
    return this._addListener(type, listener, true);
  }
  once(type, listener) {
    checkListener(listener);
    this.on(type, new OnceWrapper(this, type, listener).wrapperFunction);
    return this;
  }
  prependOnceListener(type, listener) {
    checkListener(listener);
    this.prependListener(type, new OnceWrapper(this, type, listener).wrapperFunction);
    return this;
  }
  removeListener(type, listener) {
    checkListener(listener);
    const events = this._events;
    if (events === undefined) return this;
    const list = events[type];
    if (list === undefined) return this;
    if (list === listener || list.listener === listener) {
      if (--this._eventsCount === 0) {
        this._events = Object.create(null);
      } else {
        var _listener;
        delete events[type];
        if (events.removeListener) this.emit('removeListener', type, (_listener = list.listener) !== null && _listener !== void 0 ? _listener : listener);
      }
    } else if (typeof list !== 'function') {
      let position = -1;
      let originalListener;
      for (let i = list.length - 1; i >= 0; i--) {
        if (list[i] === listener || wrappedListener(list[i]) === listener) {
          originalListener = wrappedListener(list[i]);
          position = i;
          break;
        }
      }
      if (position < 0) return this;
      if (position === 0) list.shift();else list.splice(position, 1);
      if (list.length === 1) events[type] = list[0];
      if (events.removeListener !== undefined) this.emit('removeListener', type, originalListener || listener);
    }
    return this;
  }
  off(type, listener) {
    return this.removeListener(type, listener);
  }
  removeAllListeners(type, options) {
    this._removeAllListeners(type);
    if (!options) return this;
    if (options.behavior === 'wait') {
      const errors = [];
      this._rejectionHandler = error => errors.push(error);
      return this._waitFor(type).then(() => {
        if (errors.length) throw errors[0];
      });
    }
    if (options.behavior === 'ignoreErrors') this._rejectionHandler = () => {};
    return Promise.resolve();
  }
  _removeAllListeners(type) {
    const events = this._events;
    if (!events) return;

    // not listening for removeListener, no need to emit
    if (!events.removeListener) {
      if (type === undefined) {
        this._events = Object.create(null);
        this._eventsCount = 0;
      } else if (events[type] !== undefined) {
        if (--this._eventsCount === 0) this._events = Object.create(null);else delete events[type];
      }
      return;
    }

    // emit removeListener for all listeners on all events
    if (type === undefined) {
      const keys = Object.keys(events);
      let key;
      for (let i = 0; i < keys.length; ++i) {
        key = keys[i];
        if (key === 'removeListener') continue;
        this._removeAllListeners(key);
      }
      this._removeAllListeners('removeListener');
      this._events = Object.create(null);
      this._eventsCount = 0;
      return;
    }
    const listeners = events[type];
    if (typeof listeners === 'function') {
      this.removeListener(type, listeners);
    } else if (listeners !== undefined) {
      // LIFO order
      for (let i = listeners.length - 1; i >= 0; i--) this.removeListener(type, listeners[i]);
    }
  }
  listeners(type) {
    return this._listeners(this, type, true);
  }
  rawListeners(type) {
    return this._listeners(this, type, false);
  }
  listenerCount(type) {
    const events = this._events;
    if (events !== undefined) {
      const listener = events[type];
      if (typeof listener === 'function') return 1;
      if (listener !== undefined) return listener.length;
    }
    return 0;
  }
  eventNames() {
    return this._eventsCount > 0 && this._events ? Reflect.ownKeys(this._events) : [];
  }
  async _waitFor(type) {
    let promises = [];
    if (type) {
      promises = [...(this._pendingHandlers.get(type) || [])];
    } else {
      promises = [];
      for (const [, pending] of this._pendingHandlers) promises.push(...pending);
    }
    await Promise.all(promises);
  }
  _listeners(target, type, unwrap) {
    const events = target._events;
    if (events === undefined) return [];
    const listener = events[type];
    if (listener === undefined) return [];
    if (typeof listener === 'function') return unwrap ? [unwrapListener(listener)] : [listener];
    return unwrap ? unwrapListeners(listener) : listener.slice();
  }
}
exports.EventEmitter = EventEmitter;
function checkListener(listener) {
  if (typeof listener !== 'function') throw new TypeError('The "listener" argument must be of type Function. Received type ' + typeof listener);
}
class OnceWrapper {
  constructor(eventEmitter, eventType, listener) {
    this._fired = false;
    this.wrapperFunction = void 0;
    this._listener = void 0;
    this._eventEmitter = void 0;
    this._eventType = void 0;
    this._eventEmitter = eventEmitter;
    this._eventType = eventType;
    this._listener = listener;
    this.wrapperFunction = this._handle.bind(this);
    this.wrapperFunction.listener = listener;
  }
  _handle(...args) {
    if (this._fired) return;
    this._fired = true;
    this._eventEmitter.removeListener(this._eventType, this.wrapperFunction);
    return this._listener.apply(this._eventEmitter, args);
  }
}
function unwrapListener(l) {
  var _wrappedListener;
  return (_wrappedListener = wrappedListener(l)) !== null && _wrappedListener !== void 0 ? _wrappedListener : l;
}
function unwrapListeners(arr) {
  return arr.map(l => {
    var _wrappedListener2;
    return (_wrappedListener2 = wrappedListener(l)) !== null && _wrappedListener2 !== void 0 ? _wrappedListener2 : l;
  });
}
function wrappedListener(l) {
  return l.listener;
}