/*
* Copyright (c) 2008 Greg Weber greg at gregweber.info
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*
* documentation at http://gregweber.info/projects/uitablefilter
*
* allows table rows to be filtered (made invisible)
* <code>
* t = $('table')
* $.uiTableFilter( t, phrase )
* </code>
* arguments:
*   jQuery object containing table rows
*   phrase to search for
*   optional arguments:
*     column to limit search too (the column title in the table header)
*     ifHidden - callback to execute if one or more elements was hidden
*/
jQuery.uiTableFilter = function(jq, phrase, column, ifHidden) {
    var new_hidden = false;
    if (this.last_phrase === phrase) return false;

    var phrase_length = phrase.length;
    var words = phrase.toLowerCase().split(" ");

    // these function pointers may change
    var matches = function(elem) { elem.show() }
    var noMatch = function(elem) { elem.hide(); new_hidden = true }
    var getText = function(elem) { return elem.text() }

    if (column) {
        var index = null;
        jq.find("thead > tr:last > th").each(function(i) {
            if ($.trim($(this).text()) == column) {
                index = i; return false;
            }
        });
        if (index == null) throw ("given column: " + column + " not found")

        getText = function(elem) {
            return jQuery(elem.find(
      ("td:eq(" + index + ")"))).text()
        }
    }

    // if added one letter to last time,
    // just check newest word and only need to hide
    if ((words.size > 1) && (phrase.substr(0, phrase_length - 1) ===
        this.last_phrase)) {

        if (phrase[-1] === " ")
        { this.last_phrase = phrase; return false; }

        var words = words[-1]; // just search for the newest word

        // only hide visible rows
        matches = function(elem) { ; }
        var elems = jq.find("tbody > tr:visible")
    }
    else {
        new_hidden = true;
        var elems = jq.find("tbody > tr")
    }

    elems.each(function() {
        var elem = jQuery(this);
        jQuery.uiTableFilter.has_words(getText(elem), words, false) ?
      matches(elem) : noMatch(elem);
    });

    last_phrase = phrase;
    if (ifHidden && new_hidden) ifHidden();
    return jq;
};

// caching for speedup
jQuery.uiTableFilter.last_phrase = ""

// not jQuery dependent
// "" [""] -> Boolean
// "" [""] Boolean -> Boolean
jQuery.uiTableFilter.has_words = function(str, words, caseSensitive) {
    var text = caseSensitive ? str : str.toLowerCase();
    for (var i = 0; i < words.length; i++) {
        if (text.indexOf(words[i]) === -1) return false;
    }
    return true;
}