"use strict";

var Shim = require("collections/shim");
var ArcSet = require("./arc-set");
var GenericCollection = require("collections/generic-collection");
var GenericMap = require("collections/generic-map");
var PropertyChanges = require("collections/listen/property-changes");

module.exports = ArcMap;

function ArcMap(values, maxLength, equals, hash, getDefault) {
    if (!(this instanceof ArcMap)) {
        return new ArcMap(values, maxLength, equals, hash);
    }
    equals = equals || Object.equals;
    hash = hash || Object.hash;
    getDefault = getDefault || Function.noop;
    this.contentEquals = equals;
    this.contentHash = hash;
    this.getDefault = getDefault;
    this.store = new ArcSet(
        undefined,
        maxLength,
        function keysEqual(a, b) {
            return equals(a.key, b.key);
        },
        function keyHash(item) {
            return hash(item.key);
        }
    );
    this.length = 0;
    this.addEach(values);
}

Object.addEach(ArcMap.prototype, GenericCollection.prototype);
Object.addEach(ArcMap.prototype, GenericMap.prototype);
Object.addEach(ArcMap.prototype, PropertyChanges.prototype);

ArcMap.prototype.constructClone = function (values) {
    return new this.constructor(
        values,
        this.maxLength,
        this.contentEquals,
        this.contentHash,
        this.getDefault
    );
};