//
// new PaginatingTable( 'my_table', 'ul_for_paginating', {
// per_page: 10, // How many rows per page?
// current_page: 1, // What page to start on when initialized
// offset_el: false, // What dom element to stick the offset in
// cutoff_el: false, // What dom element to stick the cutoff in
// details: false // Do we have hidden/collapsable rows?
// });
//
// The above were the defaults. You could also pass an array of paginators
// instead of just one.
//
// Requires mootools Class, Array, Function, Element, Element.Selectors,
// Element.Event, and you should probably get Window.DomReady if you're smart.
//

var PaginatingTable = new Class({

    Implements: Options,

    options: {
        per_page: 10,
        current_page: 1,
        offset_el: false,
        cutoff_el: false,
        details: false
    },

    initialize: function(table, ids, options) {
        this.table = $(table);
        this.setOptions(options);

        this.tbody = this.table.getElement('tbody');

        if (this.options.offset_el)
            this.options.offset_el = $(this.options.offset_el);
        if (this.options.cutoff_el)
            this.options.cutoff_el = $(this.options.cutoff_el);

        this.paginators = ($type(ids) == 'array') ? ids.map($) : [$(ids)];

        if (this.options.details) {
            this.options.per_page = this.options.per_page * 2
        }

        this.update_pages();
    },

    update_pages: function() {
        this.pages = Math.ceil(this.tbody.getChildren().length / this.options.per_page);
        this.create_pagination();
        this.to_page(1);
    },

    to_page: function(page_num) {
        page_num = page_num.toInt();
        if (page_num > this.pages || page_num < 1) return;
        this.current_page = page_num;
        this.low_limit = this.options.per_page * (this.current_page - 1);
        this.high_limit = this.options.per_page * this.current_page;
        var trs = this.tbody.getChildren();
        if (trs.length < this.high_limit) this.high_limit = trs.length;
        for (var i = 0, j = trs.length; i < j; i++) {
            trs[i].style.display = (this.low_limit <= i && this.high_limit > i) ? '' : 'none';
        }
        this.paginators.each(function(paginator) {
            var as = paginator.getElements('a').removeClass('currentPage');
            as[this.current_page].addClass('currentPage');
        }, this);
        if (this.options.offset_el)
            this.options.offset_el.set('text', Math.ceil(this.low_limit / (this.options.details ? 2 : 1) + 1));
        if (this.options.cutoff_el)
            this.options.cutoff_el.set('text', (this.high_limit / (this.options.details ? 2 : 1)));
    },

    to_next_page: function() {
        this.to_page(this.current_page + 1);
    },

    to_prev_page: function() {
        this.to_page(this.current_page - 1);
    },

    create_pagination: function() {
        this.paginators.each(function(paginator) {
            paginator.empty();
            this.create_pagination_node('&#171;', function(evt) {
                var evt = new Event(evt);
                this.to_prev_page();
                evt.stop();
                return false;
            }).injectInside(paginator);
            for (var page = 1; page <= this.pages; page++) {
                this.create_pagination_node(page, function(evt) {
                    var evt = new Event(evt);
                    this.to_page(evt.target.get('text'));
                    evt.stop();
                    return false;
                }).injectInside(paginator);
            }
            this.create_pagination_node('&#187;', function(evt) {
                var evt = new Event(evt);
                this.to_next_page();
                evt.stop();
                return false;
            }).injectInside(paginator);
        } .bind(this));
    },

    create_pagination_node: function(text, evt) {
        var span = new Element('span').set('html', text);
        if (text == '&#171;') {
            var a = new Element('a', { 'href': '#', 'class': 'previous-page' }).addEvent('click', evt.bind(this));
        } else if (text == '&#187;') {
            var a = new Element('a', { 'href': '#', 'class': 'next-page' }).addEvent('click', evt.bind(this));
        } else {
            var a = new Element('a', { 'href': '#' }).addEvent('click', evt.bind(this));
        }
        var li = new Element('li');
        span.injectInside(a.injectInside(li));
        return li;
    }

});