'use strict';

/*@
Ox.ExamplePanel <f> Example Panel
    ([options[, self]]) -> <o:Ox.SplitPanel> Example Panel
        load <!> load
        select <!> select
            id <s> selected example
    options <o> Options
    self <o> Shared private variable
@*/

Ox.ExamplePanel = function(options, self) {

    self = self || {};
    var that = Ox.Element({}, self)
        .defaults({
            element: '',
            examples: [],
            path: '',
            references: null,
            replaceCode: [],
            replaceComment: [],
            selected: '',
            size: 256
        })
        .options(options || {})
        .update({
            selected: function() {
                self.$list.options({selected: [self.options.selected]});
            }
        });

    self.$list = Ox.Element();
    self.$page = Ox.Element();

    that.setElement(
        self.$panel = Ox.SplitPanel({
            elements: [
                {
                    element: self.$list,
                    size: self.options.size
                },
                {
                    element: self.$page
                }
            ],
            orientation: 'horizontal'
        })
    );

    loadList(function(items) {
        self.items = items;
        self.$list = Ox.TextList({
                columns: [
                    {
                        id: 'id',
                        unique: true
                    },
                    {
                        id: 'title',
                        operator: '+',
                        title: 'Title',
                        visible: true,
                        width: self.options.size - Ox.UI.SCROLLBAR_SIZE
                    }
                ],
                items: self.items,
                max: 1,
                selected: self.options.selected
                    ? [self.options.selected] : [],
                scrollbarVisible: true,
                sort: ['+title']
            })
            .bindEvent({
                select: function(data) {
                    selectItem(data.ids[0] || '');
                }
            });
        self.$panel.replaceElement(0, self.$list);
        selectItem(self.options.selected);
        that.triggerEvent('load', {});
    });

    function loadList(callback) {
        var items = [];
        self.options.examples.forEach(function(example) {
            var item = {
                html: self.options.path + example + '/index.html',
                id: example,
                js: self.options.path + example + '/js/example.js'
            };
            Ox.get(item.html, function(html) {
                var title = html.match(/<title>(.+)<\/title>/);
                item.title = title ? title[1] : 'Untitled'
                Ox.get(item.js, function(js) {
                    var references = js.match(self.options.references);
                    item.references = references ? Ox.unique(references).sort(function(a, b) {
                        a = a.toLowerCase();
                        b = b.toLowerCase();
                        return a < b ? -1 : a > b ? 1 : 0;
                    }) : [];
                    items.push(item);
                    items.length == self.options.examples.length && callback(items);
                });
            });
        });
    }

    function selectItem(id) {
        var item = id ? Ox.getObjectById(self.items, id) : null
        if (item) {
            self.options.selected = id;
            self.$panel.replaceElement(1,
                self.$page = Ox.ExamplePage({
                        height: window.innerHeight,
                        html: item.html,
                        js: item.js,
                        references: item.references,
                        replaceCode: self.options.replaceCode,
                        replaceComment: self.options.replaceComment,
                        title: item.title,
                        width: window.innerWidth - self.options.size
                    })
                    .bindEvent({
                        close: function() {
                            selectItem();
                        }
                    })
            );
        } else {
            self.options.selected = '';
            self.$list.options({selected: []});
            self.$page.empty().append(self.options.element);
        }
        that.triggerEvent('select', {id: self.options.selected});
    }

    return that;

};