/*
* Copyright (c) 2008 Greg Weber greg at gregweber.info
* Dual licensed under the MIT and GPLv2 licenses just as jQuery is:
* http://jquery.org/license
*
* documentation at http://gregweber.info/projects/uitablefilter
*
* allows table rows to be filtered (made invisible)
* <code>
* t = $('table')
* $.uiTableFilter( t, phrase )
* </code>
* arguments:
*   jQuery object containing table rows
*   phrase to search for
*   optional arguments:
*     column to limit search too (the column title in the table header)
*     ifHidden - callback to execute if one or more elements was hidden
*/
(function ($) {
    $.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 $(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:first > tr:visible")
        }
        else {
            new_hidden = true;
            var elems = jq.find("tbody:first > tr")
        }

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

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

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

    // not jQuery dependent
    // "" [""] -> Boolean
    // "" [""] Boolean -> Boolean
    $.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;
    }
})(jQuery);