/*
 * @file Manages all library initialization, jQuery callbacks, query entry
 *      callbacks, server querying, and results diplay for `index.html`.
 */

var advancedSearchDiv = $("div#advanced-search");
var advancedSearchButton = $("button#advanced-search");
FINISH_TYPING_INTERVAL = 650;
var searchBar = $("form#search-bar input[type='text']")[0];
var resultsDiv = $("div#results")[0];

var typingTimer, lastValue;
/*
 * Set all page callbacks.
 */
(function setHomePageCallbabacks(){
    // Enable infinite scrolling down the results page.
    $(window).scroll(function(){
        if($(window).scrollTop() + $(window).height() == $(document).height() &&
                resultsDiv.querySelectorAll(".result").length > 0)
            loadMoreResults();
    });

    // Toggle the advanced-search form's visibility.
    advancedSearchButton.click(function(){
        var searchField = $("div#search-field");
        if(!advancedSearchDiv.hasClass("visible")){
            searchField.addClass("partly-visible");
            advancedSearchDiv.fadeIn(500).addClass("visible");
            advancedSearchButton.addClass("clicked");
        }
        else {
            advancedSearchDiv.fadeOut(300).removeClass("visible");
            advancedSearchButton.removeClass("clicked");
            if($("div#results .result").length == 0)
                searchField.removeClass("partly-visible");
        }
    });

    // Enable capturing the `enter` key.
    $("form#search-bar").submit(function(event){
        event.preventDefault();
        return false;
    });
    searchBar.onkeyup = typingTimer;
}());

//Obtained by parsing python file with pygments
var codeExample = '<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1\n 2\n 3\n 4\n 5\n 6\n 7\n 8\n 9\n10\n11\n12\n13\n14\n15\n16\n17\n18\n19\n20\n21\n22\n23\n24\n25\n26\n27\n28\n29\n30\n31\n32\n33\n34\n35\n36\n37\n38\n39\n40</pre></div></td><td class="code"><div class="highlight"><pre><span class="sd">&quot;&quot;&quot;</span>\n<span class="sd">Module to contain all the project&#39;s Flask server plumbing.</span>\n<span class="sd">&quot;&quot;&quot;</span>\n\n<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">Flask</span>\n<span class="kn">from</span> <span class="nn">flask</span> <span class="kn">import</span> <span class="n">render_template</span><span class="p">,</span> <span class="n">session</span>\n\n<span class="kn">from</span> <span class="nn">bitshift</span> <span class="kn">import</span> <span class="n">assets</span>\n<span class="c"># from bitshift.database import Database</span>\n<span class="c"># from bitshift.query import parse_query</span>\n\n<span class="hll"><span class="n">app</span> <span class="o">=</span> <span class="n">Flask</span><span class="p">(</span><span class="n">__name__</span><span class="p">)</span>\n</span><span class="hll"><span class="n">app</span><span class="o">.</span><span class="n">config</span><span class="o">.</span><span class="n">from_object</span><span class="p">(</span><span class="s">&quot;bitshift.config&quot;</span><span class="p">)</span>\n</span>\n<span class="hll"><span class="n">app_env</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">jinja_env</span>\n</span><span class="hll"><span class="n">app_env</span><span class="o">.</span><span class="n">line_statement_prefix</span> <span class="o">=</span> <span class="s">&quot;=&quot;</span>\n</span><span class="hll"><span class="n">app_env</span><span class="o">.</span><span class="n">globals</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">assets</span><span class="o">=</span><span class="n">assets</span><span class="p">)</span>\n</span>\n<span class="c"># database = Database()</span>\n\n<span class="hll"><span class="nd">@app.route</span><span class="p">(</span><span class="s">&quot;/&quot;</span><span class="p">)</span>\n</span><span class="k">def</span> <span class="nf">index</span><span class="p">():</span>\n    <span class="k">return</span> <span class="n">render_template</span><span class="p">(</span><span class="s">&quot;index.html&quot;</span><span class="p">)</span>\n\n<span class="hll"><span class="nd">@app.route</span><span class="p">(</span><span class="s">&quot;/search/&lt;query&gt;&quot;</span><span class="p">)</span>\n</span><span class="k">def</span> <span class="nf">search</span><span class="p">(</span><span class="n">query</span><span class="p">):</span>\n    <span class="c"># tree = parse_query(query)</span>\n    <span class="c"># database.search(tree)</span>\n    <span class="k">pass</span>\n\n<span class="hll"><span class="nd">@app.route</span><span class="p">(</span><span class="s">&quot;/about&quot;</span><span class="p">)</span>\n</span><span class="k">def</span> <span class="nf">about</span><span class="p">():</span>\n    <span class="k">return</span> <span class="n">render_template</span><span class="p">(</span><span class="s">&quot;about.html&quot;</span><span class="p">)</span>\n\n<span class="hll"><span class="nd">@app.route</span><span class="p">(</span><span class="s">&quot;/developers&quot;</span><span class="p">)</span>\n</span><span class="k">def</span> <span class="nf">developers</span><span class="p">():</span>\n    <span class="k">return</span> <span class="n">render_template</span><span class="p">(</span><span class="s">&quot;developers.html&quot;</span><span class="p">)</span>\n\n<span class="k">if</span> <span class="n">__name__</span> <span class="o">==</span> <span class="s">&quot;__main__&quot;</span><span class="p">:</span>\n<span class="hll">    <span class="n">app</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">debug</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>\n</span></pre></div>\n</td></tr></table>'
searchBar.onkeyup = typingTimer;

var testCodelet = {
    'code_url': 'https://github.com/earwig/bitshift/blob/develop/app.py',
    'filename': 'app.py',
    'language': 'python',
    'date_created': 'May 10, 2014',
    'date_modified': '2 days ago',
    'origin': ['GitHub', 'https://github.com', ''],
    'authors': ['sevko', 'earwig'],
    'html_code': codeExample
};

// Enable infinite scrolling down the results page.
$(window).scroll(function() {
    var searchField = $("div#search-field");
    if($(window).scrollTop() + $(window).height() == $(document).height() && searchField.hasClass('partly-visible')){
        loadMoreResults();
    }
});

/*
 * Clear the existing timer and set a new one the the user types text into the
 * search bar.
 */
function typingTimer(event){
    clearTimeout(typingTimer);

    var enterKeyCode = 13;
    if(event.keyCode != enterKeyCode){
        if(lastValue != searchBar.value)
            typingTimer = setTimeout(finishedTyping, FINISH_TYPING_INTERVAL);
    }
    else {
        event.preventDefault();
        finishedTyping();
        return false;
    }
};

/*
 * Callback which queries the server whenver the user stops typing.
 *
 * Whenever the user doesn't type for a `FINISH_TYPING_INTERVAL` after having
 * entered new text in the search bar, send the current query request to the
 * server.
 */
function finishedTyping(){
    lastValue = searchBar.value;
    var searchField = $("div#search-field");

    clearResults();
    if(searchBar.value){
        searchField.addClass("partly-visible");
        populateResults();
    }
    else {
        searchField.removeClass("partly-visible");
        $("div#advanced-search").fadeOut(50);
        advancedSearchButton.removeClass("clicked");
    }
}

/*
 * Removes any child elements of `div#results`.
 */
function clearResults(){
    while(resultsDiv.firstChild)
        resultsDiv.removeChild(resultsDiv.firstChild);
}

/*
 * Query the server with the current search string, and populate `div#results`
 * with its response.
 */
function populateResults(){
    var results = queryServer();

    for(var result = 0; result < results.length; result++){
        var newDiv = results[result];
        resultsDiv.appendChild(newDiv);
        setTimeout(
            (function(divReference){
                return function(){
                    divReference.classList.add("cascade");
                };
            }(newDiv)), result * 20);
    }
}

/*
 * Create a result element based upon a codelet instance.
 *
 * @return {Element} The result element.
 */
function createResult(codelet) {
    //Level 1
    var newDiv = document.createElement("div"),
        table = document.createElement("table"),
        row = document.createElement("tr");
    //Level 2
    var displayInfo = document.createElement("div"),
        codeElt = document.createElement("td"),
        hiddenInfoContainer = document.createElement("td"),
        hiddenInfo = document.createElement("div");
    //Level 3
    var title = document.createElement("span"),
        site = document.createElement("span"),
        dateModified = document.createElement("div"),
        language = document.createElement("span"),
        dateCreated = document.createElement("div"),
        authors = document.createElement("div");

    //Classes and ID's
    newDiv.classList.add('result');

    displayInfo.id = 'display-info';
    codeElt.id = 'code';
    hiddenInfo.id = 'hidden-info';

    title.id = 'title';
    site.id = 'site';
    dateModified.id = 'date-modified';
    language.id = 'language';
    dateCreated.id = 'date-created';
    authors.id = 'authors';

    //Add the bulk of the html
    title.innerHTML = 'File <a href="' + codelet.code_url + '">'
                      + codelet.filename + '</a>';
    site.innerHTML = 'on <a href="' + codelet.origin[1] + '">' + codelet.origin[0] +'</a>';
    language.innerHTML = codelet.language;
    dateModified.innerHTML = 'Last modified: <span>' + codelet.date_modified + '</span>';
    // Needs to be changed from int to string on the server
    dateCreated.innerHTML = 'Created: <span>' + codelet.date_created + '</span>';

    var authorsHtml = 'Authors: <span>';
    codelet.authors.forEach(function(a, i) {
        if (i == codelet.authors.length - 1)
            authorsHtml += '<a href=#>' + a + ' </a>';
        else
            authorsHtml += '<a href=#>' + a + ' </a>, ';
    });
    authors.innerHTML = authorsHtml;

    // Needs to be processed on the server
    codeElt.innerHTML = '<div id=tablecontainer>' + codelet.html_code + '</div>';

    //Event binding
    $(newDiv).hover(function(e) {
        $(row).addClass('display-all');
    });

    $(newDiv).on('transitionend', function(e) {
        $(newDiv).one('mouseleave', function(e) {
            $(row).removeClass('display-all');
        });
    });

    //Finish and append elements to parent elements
    hiddenInfo.appendChild(dateCreated);
    hiddenInfo.appendChild(dateModified);
    hiddenInfo.appendChild(authors);

    hiddenInfoContainer.appendChild(hiddenInfo);

    row.appendChild(codeElt);
    row.appendChild(hiddenInfoContainer);
    table.appendChild(row);

    displayInfo.appendChild(title);
    displayInfo.appendChild(site);
    displayInfo.appendChild(language);

    newDiv.appendChild(displayInfo);
    newDiv.appendChild(table);

    return newDiv;
}

/*
 * AJAX the current query string to the server, and return its response.
 *
 * @return {Array} The server's response in the form of `div.result` DOM
 *      elements, to fill `div#results`.
 */
function queryServer(){
    var resultDivs = []
    for(var result = 0; result < 20; result++){
        var newDiv = createResult(testCodelet);
        resultDivs.push(newDiv);
    }

    return resultDivs;
}

/*
 * Adds more results to `div#results`.
 */
function loadMoreResults(){
    results = queryServer();
    for(var result = 0; result < results.length; result++){
        var newDiv = results[result];
        resultsDiv.appendChild(newDiv);
        setTimeout(
            (function(divReference){
                return function(){
                    divReference.classList.add("cascade");
                };
            }(newDiv)),
            result * 20);
    }
}