/* Copyright 2010 Google Inc.

 * 

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 * 

 *      http://www.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS.

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License

 */



/**

 * Library for ideaexchange js Paging

 * 

 * @author Abhishek

 */

ie.Paging = {

    previousCss : 'previous',

    nextCss : 'next',

    selectedPageCss : 'page_sel',

    pageCss : 'page_no',

    recordPerPage : '20',

    pageRange : 10

};





/**

 * get HTML by providing offset

 */

ie.Paging.getHTML = function(jsonData, callback) {

    var outputHtml = '';

    if(undefined != jsonData.previous && jsonData.previous >= 0) {

        outputHtml += '<a title="Previous" onclick="' + callback + '(' + jsonData.previous + ')" href="javascript:void(0);" class="' + this.previousCss + '">&laquo; Previous</a>';

    }

    if(undefined != jsonData.next && jsonData.next >= 0) {

        outputHtml += '<a title="Next" onclick="' + callback + '(' + jsonData.next + ')" href="javascript:void(0);" class="' + this.previousCss + '">Next &raquo;</a>';

    }

    return outputHtml;

}



/**

 * get HTML by providing offset

 */

ie.Paging.getHTMLByOffset = function(totalRecords, startOffset) {

    if(0 == totalRecords % this.recordPerPage) {

        var totalPageCount = totalRecords/this.recordPerPage + 1;

    }

    else {

        var totalPageCount = totalRecords/this.recordPerPage;

    }

        selectedPage = (startOffset / this.recordPerPage) + 1;

    this.getHTMLByPage(totalPageCount, startOffset);

}



/**

 * get HTML by providing offset

 */

ie.Paging.getHTMLByPage = function(totalPageCount, selectedPage) {

    var minRange = (this.pageRange % 2 == 0) ? (this.pageRange / 2) - 1 : (this.pageRange - 1) / 2;

    var maxRange = (this.pageRange % 2 == 0) ? minRange + 1 : minRange;

    // selectedPage will be current page

    var minPage = selectedPage - minRange;

    var maxPage = selectedPage + maxRange;

    minPage = (minPage < 1) ? 1 : minPage;

    maxPage = (maxPage < (minPage + this.pageRange - 1)) ? minPage + this.pageRange - 1 : maxPage;

    

    // totalPageCount is total pages for records

    if (maxPage > totalPageCount) {

        minPage = (minPage > 1) ? totalPageCount - this.pageRange + 1 : 1;

        maxPage = totalPageCount;

    }

    

    minPage = (minPage < 1) ? 1 : minPage;



    

    

    

    var outputHtml = '';

    // Add previous page link

    if (selectedPage != 1) {

        outputHtml += '<a title="Previous" href="#" class="' + this.previousCss + '">&laquo;</a>';

    }

    

    var pageCount = 1;

    for ( var counter = minPage; counter < maxPage; counter++) {

        if (selectedPage == counter) {

            outputHtml += '<a href="#" class="' + this.selectedPageCss + '">'

                    + counter + '</a>';

        } else {

            outputHtml += '<a href="#" class="' + this.pageCss + ' '

                    + this.pageCss + '">' + counter + '</a>';

        }

        pageCount++;

    }



    if (selectedPage < totalPageCount) {

        outputHtml += '<a title="Next" href="#" class="' + this.nextCss + '">&raquo;</a>';

    }

    return outputHtml;

}