var reqSearch; //the xmlhttprequest for the search
var results; // JSON object holding search results
var keyword; // keyword searched
var itemsPerPage = 10; //pagination
var divResults = document.getElementById('divSearchWithin');
var selectedResult = -999; //keep track of which row is selected and shaded
var showFullResults = false;
var prevKeyword = "";

var btnSearch = document.getElementById("btnSearch");
btnSearch.onmouseover = handleButton;
btnSearch.onmouseout = handleButton;
btnSearch.onmousedown = handleButton;

function searchKeyPress(e)
{
    if (!e) 
    {
        e = window.event;
    }
    if (e && e.keyCode == 13)
    {
        doSearch(false);
        e.cancelBubble = true;
        return false; //here to cancel the event
    }
}

function doSearch(showAllResults)
{
    //set global variable
    showFullResults = showAllResults;
    
    //expand if collapsed
    if(document.getElementById("divSearchWithin").style.display == 'none')
    {
        toggleDiv('divSearchWithin');
    }

    keyword = document.getElementById('txtSearch').value;
    
    if (keyword !== "")
    {
        var url = '/Services/Search.aspx?isbn13=' + isbn13 + '&keyword=' + keyword + '&showFullResults=' + showFullResults;
        divResults.innerHTML = 'Searching...';
        reqSearch = getXMLHTTPRequest(); //new request
        reqSearch.onreadystatechange = searchComplete; //set handler
        reqSearch.open('GET', url, true); //go little request go
        reqSearch.send(null);
    
        //set prevKeyword for full search
        prevKeyword = keyword;
    }
    else if ((prevKeyword !== "") && (showAllResults))
    {
        var url = '/Services/Search.aspx?isbn13=' + isbn13 + '&keyword=' + prevKeyword + '&showFullResults=' + showFullResults;
        divResults.innerHTML = 'Searching...';
        reqSearch = getXMLHTTPRequest(); //new request
        reqSearch.onreadystatechange = searchComplete; //set handler
        reqSearch.open('GET', url, true); //go little request go
        reqSearch.send(null);
    }
}

function searchComplete()
{
  if (reqSearch.readyState == 4)//4 = complete
  {
    divResults.innerHTML = '...parsing...';
    results = eval(reqSearch.responseText);
    displayResults(1); //show first page of results
    resetSearchedPages();
  }
}

function displayResults(pageNum)
{
    divResults.innerHTML = '...paging...';
    rowCount = results.pages.length ;
    var searchTerm = document.getElementById('txtSearch').value;
    var txtReg = '(' + searchTerm + ')';
    var reg = new RegExp(txtReg,'gi' ); //global, case-insensitive
    var resultsHTML = ''; //build the output in here before writing it out
    
    if (rowCount === 0) {
        resultsHTML += '<div class="noResults">' + rowCount + ' results for "' + searchTerm + '"</div><div class="sbHRSearch"><img src="/images/space.gif" width="1" height="1"/></div>';
        resultsHTML += '<div class="noResultsTxt">Your search returned no results. Please try a different search term.</div><br/>';
    }
    else
    {
        if (showFullResults) {
            resultsHTML += '<span class="sbHed">' + rowCount + ' results for "' + prevKeyword + '"</span>';
        } else {
            resultsHTML += '<span class="sbHed">First ' + rowCount + ' results for "' + searchTerm + '"</span><br/><br/>';
        }
        
        //how many pages are there?
        var maxPage = Math.floor((rowCount-1) / itemsPerPage) + 1;
        var firstRow = (pageNum-1) * itemsPerPage ;
        var lastRow = firstRow + itemsPerPage - 1;
        //don't try to go past last row
        if(lastRow > rowCount  - 1)
        {
            lastRow = rowCount - 1;
        }
        //header nav
        if (showFullResults) {
            resultsHTML += drawPagingControl(pageNum,maxPage);
        }
        
        for (i=firstRow; i <= lastRow; i++) {
            //separator
            if(i>firstRow)
            {
                resultsHTML += '<div class="sbHRSearch"><img src="/images/space.gif" width="1" height="1"/></div>';
            }
            
            if (results.pages[i].pageName != "") {
                strPage = 'Page ' + results.pages[i].pageName;
            } else {
                strPage = 'Page number not available';
            }
            
            strSnippet = results.pages[i].text + '... ';
            var resultClass, resultClick, searchTermReplace;
            
            if (isViewablePage(results.pages[i].sequence)) {
                resultClass = "sbResult";
                resultClick = 'onClick="selectResult(' + i + ');"';
                searchTermReplace = '<span class="sbSearchTerm">$1</span>';
            } else {
                resultClass = "sbResultUnavailable";
                resultClick = '';
                strSnippet += '<br/>Page unavailable';
                searchTermReplace = '<span class="sbSearchTermUnavailable">$1</span>';
            }
            //highlight the search terms
	        strSnippet = strSnippet.replace(reg,searchTermReplace);
            resultsHTML += '<div id="sbResult' + i + '" class="' + resultClass + '" ' + resultClick + '>' + strPage + '<br/>' + strSnippet + '</div>';
        }
        
        //footer nav
        if (showFullResults) {
            resultsHTML += drawPagingControl(pageNum,maxPage);
        } else {
            resultsHTML += '<div class="sbHR"><img src="/images/space.gif" width="1" height="1"/></div><div class="sbSeeFullResults"><a class="sbA" href="javascript:doSearch(true);">See all results for "' + searchTerm + '"</a>&nbsp;<span class="blue">&raquo;</span><br/>(Loading times may vary)</div>';
        }
    }
    divResults.innerHTML = resultsHTML;
}

function selectResult(newResult)
{
    //clear the old selection if it exists
    var oldRow = document.getElementById('sbResult' + selectedResult);
    if(oldRow)
    {
        oldRow.style.backgroundColor = "#FFFFFF";
    }    
    //select the new row
    selectedResult = newResult;
    var newRow = document.getElementById('sbResult' + selectedResult);
    newRow.style.backgroundColor = "#DFDFDF";
    
    //goToPageSequence(results.pages[selectedResult].sequence);
    getSearchPageImage(results.pages[selectedResult].pageGuid);
}

function drawPagingControl(curPage, maxPage)
{
    var strOut = '<table cellpadding="0" cellspacing="0" border="0" class="sbPaging"><tr>';
    strOut += '<td class="sbPagingLt">';
    if(curPage > 1)
    {
        // draw prev control
        strOut += '<span class="blue">&laquo;</span>&nbsp;<a class="sbA" href="javascript:displayResults('+ (curPage - 1) +');">Previous</a>';
    }
    else
    {
        // disabled prev control
        strOut += "&nbsp;";
    }
    strOut += '</td>';
    // show current postion "xx of yy"
    strOut += '<td class="sbPagingMid">' + curPage + ' of ' + maxPage + '</td>';
    strOut += '<td class="sbPagingRt">';
    if(curPage < maxPage)
    {
        //draw next control
        strOut += '<a class="sbA" href="javascript:displayResults('+ (curPage + 1) +');">Next</a>&nbsp;<span class="blue">&raquo;</span>';
    }
    else
    {
        //disabled next control
        strOut += "&nbsp;";
    }
    strOut += '</td>';
    strOut += '</tr></table>';
    return strOut;
}

//get the selected page with search term highlighted (highlit?)
function getSearchPageImage(pageGuid)
{
    //expand if collapsed
    if(document.getElementById("divSearchWithin").style.display == 'none')
    {
        toggleDiv('divSearchWithin');
    }
    var keyword = document.getElementById('txtSearch').value;
    var url = '/Services/GetSearchPage.aspx?isbn13=' + isbn13 + '&keyword=' + keyword + '&pageGuid=' + pageGuid;
    reqSearch = getXMLHTTPRequest(); //new request
    reqSearch.onreadystatechange = gotSearchPage; //set handler
    reqSearch.open('GET', url, true); //go little request go
    reqSearch.send(null);
}

function gotSearchPage()
{
  if (reqSearch.readyState == 4)//4 = complete
  {
    goToPageSequence(results.pages[selectedResult].sequence);
  }
}

function searchKeyword(keyword)
{
    var txtSearch = document.getElementById('txtSearch');
    txtSearch.value = keyword;
    doSearch();
}