/*!
 * cellsByRows layout mode for Isotope
 * v1.1.3
 * http://isotope.metafizzy.co/layout-modes/cellsbyrow.html
 */

/*jshint browser: true, devel: false, strict: true, undef: true, unused: true */

( function( window, factory ) {
  // universal module definition
  /* jshint strict: false */ /*globals define, module, require */
  if ( typeof define === 'function' && define.amd ) {
    // AMD
    define( [
        'isotope/js/layout-mode'
      ],
      factory );
  } else if ( typeof exports === 'object' ) {
    // CommonJS
    module.exports = factory(
      require('isotope-layout/js/layout-mode')
    );
  } else {
    // browser global
    factory(
      window.Isotope.LayoutMode
    );
  }

}( window, function factory( LayoutMode ) {
  'use strict';

  var CellsByRow = LayoutMode.create( 'cellsByRow' );
  var proto = CellsByRow.prototype;

  proto._resetLayout = function() {
    // reset properties
    this.itemIndex = 0;
    // measurements
    this.getColumnWidth();
    this.getRowHeight();
    // set cols
    this.cols = Math.floor( this.isotope.size.innerWidth / this.columnWidth );
    this.cols = Math.max( this.cols, 1 );
  };

  proto._getItemLayoutPosition = function( item ) {
    item.getSize();
    var col = this.itemIndex % this.cols;
    var row = Math.floor( this.itemIndex / this.cols );
    // center item within cell
    var x = ( col + 0.5 ) * this.columnWidth - item.size.outerWidth / 2;
    var y = ( row + 0.5 ) * this.rowHeight - item.size.outerHeight / 2;
    this.itemIndex++;
    return { x: x, y: y };
  };

  proto._getContainerSize = function() {
    return {
      height: Math.ceil( this.itemIndex / this.cols ) * this.rowHeight
    };
  };

  return CellsByRow;

}));
