/*
 * Copyright (c) 2008 Justin Britten justinbritten at gmail.com
 *
 * Some code was borrowed from:
 * 1. Greg Weber's uiTableFilter project (http://gregweber.info/projects/uitablefilter)
 * 2. Denny Ferrassoli & Charles Christolini's TypeWatch project (www.dennydotnet.com)
 *
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 */

(function ($) {
    $.extend({
        tablesorterFilter: new function () {

            document.globaltablefilter = this;

            // Default filterFunction implementation (element text, search words, case-sensitive flag)
            function has_words(str, words, caseSensitive) {
                var text = caseSensitive ? str : str.toLowerCase();

                for (var i = 0; i < words.length; i++) {
                    if (words[i].charAt(0) == '-') {
                        if (text.indexOf(words[i].substr(1)) != -1) return false; // Negated word must not be in text
                    } else if (text.indexOf(words[i]) == -1) return false; // Normal word must be in text
                }

                return true;
            }


            function doFilter(table) {
                if (table.config.debug) { var cacheTime = new Date(); }

                // Build multiple filters from input boxes
                // TODO: enable incremental filtering by caching result and applying only single filter action
                var filters = [];
                for (var i = 0; i < table.config.filter.length; i++) {
                    var container = $(table.config.filter[i].filterContainer);
                    // Trim and unify whitespace before splitting
                    var phrase = jQuery.trim(container.val()).replace(/\s+/g, ' ');
                    if (phrase.length != 0) {
                        var caseSensitive = table.config.filter[i].filterCaseSensitive;
                        filters.push({
                            caseSensitive: caseSensitive,
                            words: caseSensitive ? phrase.split(" ") : phrase.toLowerCase().split(" "),
                            findStr: table.config.filter[i].filterColumns ? "td:eq(" + table.config.filter[i].filterColumns.join("),td:eq(") + ")" : "",
                            filterFunction: table.config.filter[i].filterFunction
                        });
                    }
                }
                var filterCount = filters.length;

                // Filter cleared?
                if (filterCount == 0) {
                    var search_text = function () {
                        var elem = jQuery(this);
                        resultRows[resultRows.length] = elem;
                    }
                } else {
                    var search_text = function () {
                        var elem = jQuery(this);
                        for (var i = 0; i < filterCount; i++) {
                            if (!filters[i].filterFunction((filters[i].findStr ? elem.find(filters[i].findStr) : elem).text(), filters[i].words, filters[i].caseSensitive)) {
                                return true; // Skip elem and continue to next element
                            }
                        }
                        resultRows[resultRows.length] = elem;
                    }
                }

                // Walk through all of the table's rows and search.
                // Rows which match the string will be pushed into the resultRows array.
                var allRows = table.config.cache.row;
                var resultRows = [];

                var allRowsCount = allRows.length;
                for (var i = 0; i < allRowsCount; i++) {
                    allRows[i].each(search_text);
                }

                // Clear the table
                $.tablesorter.clearTableBody(table);

                // Push all rows which matched the search string onto the table for display.
                var resultRowsCount = resultRows.length;
                for (var i = 0; i < resultRowsCount; i++) {
                    $(table.tBodies[0]).append(resultRows[i]);
                }

                // Update the table by executing some of tablesorter's triggers
                // This will apply any widgets or pagination, if used.
                $(table).trigger("update");
                if (resultRows.length) {
                    $(table).trigger("appendCache");
                    // Apply current sorting after restoring rows
                    $(table).trigger("sorton", [table.config.sortList]);
                }

                if (table.config.debug) { $.tablesorter.benchmark("Apply filter:", cacheTime); }

                // Inform subscribers that filtering finished
                $(table).trigger("filterEnd");

                return table;
            };

            document.globaltablefilter.doFilter = doFilter;

            function clearFilter(table) {
                if (table.config.debug) { var cacheTime = new Date(); }

                // Reset all filter values
                for (var i = 0; i < table.config.filter.length; i++)
                    $(table.config.filter[i].filterContainer).val('').get(0).lastValue = '';

                var allRows = table.config.cache.row;

                $.tablesorter.clearTableBody(table);

                for (var i = 0; i < allRows.length; i++) {
                    $(table.tBodies[0]).append(allRows[i]);
                }

                $(table).trigger("update");
                $(table).trigger("appendCache");
                // Apply current sorting after restoring all rows
                $(table).trigger("sorton", [table.config.sortList]);

                if (table.config.debug) { $.tablesorter.benchmark("Clear filter:", cacheTime); }

                $(table).trigger("filterCleared");

                return table;
            };

            this.defaults = {
                filterContainer: '#filter-box',
                filterClearContainer: '#filter-clear-button',
                filterColumns: null,
                filterCaseSensitive: false,
                filterWaitTime: 500,
                filterFunction: has_words
            };


            this.construct = function () {
                var settings = arguments; // Allow multiple config objects in constructor call

                return this.each(function () {
                    this.config.filter = new Array(settings.length);
                    var config = this.config;
                    config.filter = new Array(settings.length);

                    for (var i = 0; i < settings.length; i++)
                        config.filter[i] = $.extend(this.config.filter[i], $.tablesorterFilter.defaults, settings[i]);

                    var table = this;

                    // Create a timer which gets reset upon every keyup event.
                    //
                    // Perform filter only when the timer's wait is reached (user finished typing or paused long enough to elapse the timer).
                    //
                    // Do not perform the filter is the query has not changed.
                    //
                    // Immediately perform the filter if the ENTER key is pressed.

                    function checkInputBox(inputBox, override) {
                        var value = inputBox.value;

                        if ((value != inputBox.lastValue) || (override)) {
                            inputBox.lastValue = value;
                            doFilter(table);
                        }
                    };

                    var timer = new Array(settings.length);

                    for (var i = 0; i < settings.length; i++) {
                        var container = $(config.filter[i].filterContainer);
                        // TODO: throw error for non-existing filter container?
                        if (container.length)
                            container[0].filterIndex = i;
                        container.keyup(function (e, phrase) {
                            var index = this.filterIndex;
                            if (undefined !== phrase)
                                $(this).val(phrase);
                            var inputBox = this;

                            // Was ENTER pushed?
                            if (inputBox.keyCode == 13 || undefined !== phrase) {
                                var timerWait = 1;
                                var overrideBool = true;
                            } else {
                                var timerWait = config.filter[index].filterWaitTime || 500;
                                var overrideBool = false;
                            }

                            var timerCallback = function () {
                                checkInputBox(inputBox, overrideBool);
                            }

                            // Reset the timer
                            clearTimeout(timer[index]);
                            timer[index] = setTimeout(timerCallback, timerWait);

                            return false;
                        });

                        // Avoid binding click event to whole document if no clearContainer has been defined
                        if (config.filter[i].filterClearContainer) {
                            var container = $(config.filter[i].filterClearContainer);
                            if (container.length) {
                                container[0].filterIndex = i;
                                container.click(function () {
                                    var index = this.filterIndex;
                                    var container = $(config.filter[index].filterContainer);
                                    container.val("");
                                    // Support entering the same filter text after clearing
                                    container[0].lastValue = "";
                                    // TODO: Clear single filter only
                                    doFilter(table);
                                    if (container[0].type != 'hidden')
                                        container.focus();
                                });
                            }
                        }
                    }

                    $(table).bind("doFilter", function () {
                        doFilter(table);
                    });
                    $(table).bind("clearFilter", function () {
                        clearFilter(table);
                    });
                });
            };

        }
    });

    // extend plugin scope
    $.fn.extend({
        tablesorterFilter: $.tablesorterFilter.construct
    });

})(jQuery);