/** @module Collection */
kit.PluginManager.register('Collection', function(module, exports, require, global) {

    var support = require('support');
    var valueEx = support.valueEx;

    function filter(value, key, arr) {
        return !support.empty(value);
    }

    function safeArrayKey(key){
        return support.arr.isKey(key)?Number(key):(''+key);
    }
    /**
     * @param type
     * @return {kit.Collection}
     */
    function getSimilarInstance(type) {
        if(type === 'object') {
            return new Collection({});
        }
        return new Collection([]);
    }

    /**
     * @class Collection
     * @property length
     * @memberOf kit
     */
    var Collection = function (data = []) {
        var self = this;
        this.data = data;

        support.definePropertyGet(this, 'length', function () {
            return self.__keys.length;
        });

        if(data instanceof Collection) {
            this.__type = data.__type;
            this.__keys = data.__keys;
            this.__values = data.__values;
            return;
        }

        if(Array.isArray(data)) {
            this.__type = 'array';
        }
        else if(typeof data === 'object') {
            this.__type = 'object';
            if(data.hasOwnProperty('length') && !Object.keys(data).includes('length')) {
                this.__type = 'arrayObject';
            }
        }
        else {
            this.__type = 'array';
            this.data = [data];
            console.warn('collection: not support data' + typeof data);
        }
        var key;
        this.__keys = [];
        this.__values = [];
        for(key in this.data) {
            if(!this.data.hasOwnProperty(key)) continue;
            this.__keys.push(safeArrayKey(key));
            this.__values.push(this.data[key]);
        }
    };

    /**
     * @private
     */
    Collection.prototype.__getLastIndex = function () {
        var lastIndex = -1, n = 0, index;
        for(index in this.__keys) {
            n = this.__keys[index];
            if (support.isNumber(n) && n > lastIndex) {
                lastIndex = n;
            }
        }
        return lastIndex;
    };
    Collection.prototype.all = function () {
        if(this.__type === 'array' || this.__type === 'arrayObject') {
            return this.toArray();
        }
        return this.toObject();
    };
    Collection.prototype.toArray = function () {
        var index, arr = [];
        for(index in this.__keys) {
            arr.push(this.__values[index]);
        }
        return arr;
    };
    Collection.prototype.toObject = function () {
        var index, ob = {};
        for(index in this.__keys) {
            ob[this.__keys[index]] = this.__values[index];
        }
        return ob;
    };
    Collection.prototype.serialize = function () {
        return JSON.stringify(this.toObject());
    };
    Collection.prototype.serializeArray = function () {
        return JSON.stringify(this.toArray());
    };
    Collection.prototype.has = function (key) {
        return this.__keys.includes(safeArrayKey(key));
    };
    Collection.prototype.indexKey = function (key) {
        return this.__keys.indexOf(safeArrayKey(key));
    };
    /**
     * @param key
     * @param value
     * @return {kit.Collection}
     */
    Collection.prototype.add = Collection.prototype.set = Collection.prototype.put = function (key, value) {
        var index = -1;
        if(this.has(key)) {
            this.data[key] = this.__values[index = this.indexKey(key)] = value;
            return this;
        }
        this.length = this.__keys.push(safeArrayKey(key));
        this.data[key] = this.__values[this.length-1] = value;
        return this;
    };
    /**
     * @param value
     * @return {kit.Collection}
     */
    Collection.prototype.push = function (value) {
        this.set(this.__getLastIndex() + 1, value);
        return this;
    };
    Collection.prototype.get = function (key, defValue = undefined) {
        if(this.has(key)) {
            return this.data[key];
        }
        return defValue;
    };

    Collection.prototype.count = function () {
        return this.__keys.length;
    };
    Collection.prototype.isEmpty = function () {
        return this.count() === 0;
    };
    /**
     * возвращает новый экземпляр коллекции; не изменяет вызываемую коллекцию
     *
     * @param callback
     * @return {kit.Collection}
     */
    Collection.prototype.map = function (callback) {
        var res = getSimilarInstance(this.__type);
        var index, key, value;
        for(index in this.__keys) {
            key = this.__keys[index];
            value = this.__values[index];
            res.put(key, valueEx(callback, value, key, this.data));
        }
        return res;
    };
    /**
     * @param callback
     * @return {kit.Collection}
     */
    Collection.prototype.each = function (callback = true) {
        var i;
        if(this.__keys.length)
            for (i = 0; i < this.__keys.length; i++) {
                if(valueEx(callback, this.__values[i], this.__keys[i], this.data) === false) {
                    break;
                }
            }
        return this;
    };
    /**
     * @param callback
     * @return {kit.Collection}
     */
    Collection.prototype.eachReverse = function (callback = true) {
        var i;
        if(this.__keys.length)
            for (i = this.__keys.length - 1; i >= 0; i--) {
                if(valueEx(callback, this.__values[i], this.__keys[i], this.data) === false) {
                    break;
                }
            }
        return this;
    };
    /**
     * @param callback
     * @return {kit.Collection}
     */
    Collection.prototype.filter = function (callback = filter) {
        var res = getSimilarInstance(this.__type);
        this.each(function (value, key, arr) {
            if(!!valueEx(callback, value, key, arr)) {
                res.put(key, value);
            }
        });
        return res;
    };

    /**
     * Метод возвращает все элементы коллекции, кроме тех у кого ключи соответствуют заданным
     * @param keys
     * @return {kit.Collection}
     */
    Collection.prototype.except = function (keys) {
        var __keys = [], iKey;

        if(!Array.isArray(keys)) {
            keys = [keys];
        }
        for(iKey in keys) {
            __keys.push(safeArrayKey(keys[iKey]));
        }

        return this.filter(function (value, key) {
            return !__keys.includes(key);
        });
    };
    /**
     * Метод возвращает элементы коллекции с заданными ключами
     * @param keys
     * @return {kit.Collection}
     */
    Collection.prototype.only = function (keys) {
        var __keys = [], iKey;

        if(!Array.isArray(keys)) {
            keys = [keys];
        }
        for(iKey in keys) {
            __keys.push(safeArrayKey(keys[iKey]));
        }

        return this.filter(function (value, key) {
            return __keys.includes(key);
        });
    };
    Collection.prototype.every = function (callback) {
        var res = true;
        this.each(function (value, key, arr) {
            res = res && !!valueEx(callback, value, key, arr);
        });
        return res;
    };
    Collection.prototype.first = function (callback = true) {
        var res = undefined;
        this.each(function (value, key, arr) {
            if(valueEx(callback, value, key, arr)) {
                res = value;
                return false;
            }
        });
        return res;
    };
    Collection.prototype.firstKey = function (callback = true) {
        var res = undefined;
        this.each(function (value, key, arr) {
            if(valueEx(callback, value, key, arr)) {
                res = key;
                return false;
            }
        });
        return res;
    };
    Collection.prototype.last = function (callback = true) {
        var res = undefined;
        this.eachReverse(function (value, key, arr) {
            if(valueEx(callback, value, key, arr)) {
                res = value;
                return false;
            }
        });
        return res;
    };
    Collection.prototype.lastKey = function (callback = true) {
        var res = undefined;
        this.eachReverse(function (value, key, arr) {
            if(valueEx(callback, value, key, arr)) {
                res = key;
                return false;
            }
        });
        return res;
    };

    /**
     * Method removes/delete an item from the collection by its key
     * @param key
     * @return {kit.Collection}
     */
    Collection.prototype.forget = function (key) {
        key = valueEx(key);
        if(!this.has(key)) {
            return this;
        }
        var index = this.indexKey(key);
        this.__keys.splice(index, 1);
        this.__values.splice(index, 1);
        delete this.data[key];
        return this;
    };
    /**
     * Method removes and returns an item from the collection by its key
     * @param key
     * @param defValue
     * @return {kit.Collection}
     */
    Collection.prototype.pull = function (key, defValue = undefined) {
        key = valueEx(key);
        if(!this.has(key)) {
            return defValue;
        }
        var index = this.indexKey(key);
        var value = this.__values[index];
        this.__keys.splice(index, 1);
        this.__values.splice(index, 1);
        delete this.data[key];
        return value;
    };
    /**
     * Method removes and returns the last item from the collection
     */
    Collection.prototype.pop = function(){
        var index = this.__keys.length - 1;
        if(index < 0) {
            return undefined;
        }
        var key = this.__keys[index];
        var value = this.__values[index];
        this.__keys.splice(index, 1);
        this.__values.splice(index, 1);
        delete this.data[key];
        return value;
    };
    /**
     * Method removes and returns the first item from the collection
     */
    Collection.prototype.shift = function(){
        var index = 0;
        if(this.length <= 0) {
            return undefined;
        }
        var key = this.__keys[index];
        var value = this.__values[index];
        this.__keys.splice(index, 1);
        this.__values.splice(index, 1);
        delete this.data[key];
        return value;
    };
    /**
     * @return {kit.Collection}
     */
    Collection.prototype.keys = function () {
        return new Collection(Object.keys(this.data));
    };
    /**
     * @return {kit.Collection}
     */
    Collection.prototype.dump = function () {
        console.log('Collection', this.data);
        return this;
    };
    /**
     * @return {kit.Collection}
     */
    Collection.prototype.dd = function () {
        this.dump();
        debugger;
        return this;
    };
    /**
     * @return {kit.Collection}
     */
    Collection.prototype.eachCall = function (context, args1, args2) {
        var args = [], i;
        if(arguments.length > 1)
            for(i = 1; arguments.length - 1 >= i;i++) {
                args.push(arguments[i]);
            }

        if(this.__keys.length)
            for (i = 0; i < this.__keys.length; i++) {
                if(typeof this.__values[i] === 'function' &&
                    this.__values[i].apply(context, args) === false) {
                    break;
                }
            }
        return this;
    };

    /**
     * аналог Array.includes
     *
     * @param searchElement
     * @param fromIndex
     * @return {boolean}
     */
    Collection.prototype.includes = function(searchElement, fromIndex) {
        var len = this.__keys.length;
        if (len === 0) {
            return false;
        }
        var n = fromIndex | 0;
        var k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
        function sameValueZero(x, y) {
            return x === y || (typeof x === 'number' && typeof y === 'number' && isNaN(x) && isNaN(y));
        }
        while (k < len) {
            if (sameValueZero(this.__values[k], searchElement)) {
                return true;
            }
            k++;
        }
        return false;
    };

    Collection.prototype.search = function(searchElement) {
        var len = this.__keys.length;
        if (len === 0) {
            return false;
        }
        var k = 0;
        function sameValueZero(x, y) {
            return x === y || (typeof x === 'number' && typeof y === 'number' && isNaN(x) && isNaN(y));
        }
        while (k < len) {
            if (sameValueZero(this.__values[k], searchElement)) {
                return this.__keys[k];
            }
            k++;
        }
        return false;
    };

    /**
     * Метод извлекает все значения для данного ключа
     * ключи оставляет исходные
     * Значения в коллекци должны быть массиво подобные
     *
     * @param key
     * @return {kit.Collection}
     */
    Collection.prototype.pluck = function (key) {
        return this.map(function (value) {
            if(value instanceof Object && value.hasOwnProperty(key)){
                return value[key];
            }
            return undefined;
        });
    };
    return module.exports = Collection;
});