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'use strict';

var _ = require('lodash');

var Paginator = function (options) {
  this._site = options.site;
  this._pageSize = options.pageSize || 10;
  this._posts = options.posts;
  this._currentPage = options.currentPage || 0;
  this._linkPrefix = options.linkPrefix || '/blog/pages/';
};

Object.defineProperty(Paginator.prototype, 'posts', {
  get: function () {

    var posts = this._site.filterPosts(this._posts);

    return _.chain(posts)
      .rest(this._pageSize * this._currentPage)
      .take(this._pageSize)
      .value();
  },
  enumerable: true,
  configurable: true
});

Object.defineProperty(Paginator.prototype, 'nextPageLink', {
  get: function () {

    if (this._posts.length <= ((this._currentPage * this._pageSize) + this._pageSize)) {
      return null;
    }
    return this._linkPrefix + (this._currentPage + 2) + '/';
  },
  enumerable: true,
  configurable: true
});

Object.defineProperty(Paginator.prototype, 'currentPage', {
  get: function () {
    return this._currentPage || 0;
  },
  set: function (value) {
    this._currentPage = value || 0;
  },
  enumerable: true,
  configurable: true
});

Object.defineProperty(Paginator.prototype, 'previousPageLink', {
  get: function () {

    if ((this._currentPage - 1) < 0) {
      return null;
    }

    return this._linkPrefix + this._currentPage + '/';
  },
  enumerable: true,
  configurable: true
});

module.exports = Paginator;