function openerp_pos_widgets(instance, module){ //module is instance.point_of_sale
    var QWeb = instance.web.qweb;
	var _t = instance.web._t;

    module.DomCache = instance.web.Class.extend({
        init: function(options){
            options = options || {};
            this.max_size = options.max_size || 2000;

            this.cache = {};
            this.access_time = {};
            this.size = 0;
        },
        cache_node: function(key,node){
            var cached = this.cache[key];
            this.cache[key] = node;
            this.access_time[key] = new Date().getTime();
            if(!cached){
                this.size++;
                while(this.size >= this.max_size){
                    var oldest_key = null;
                    var oldest_time = new Date().getTime();
                    for(var key in this.cache){
                        var time = this.access_time[key];
                        if(time <= oldest_time){
                            oldest_time = time;
                            oldest_key  = key;
                        }
                    }
                    if(oldestKey){
                        delete this.cache[oldest_key];
                        delete this.access_time[oldest_key];
                    }
                    this.size--;
                }
            }
            return node;
        },
        get_node: function(key){
            var cached = this.cache[key];
            if(cached){
                this.access_time[key] = new Date().getTime();
            }
            return cached;
        },
    });

    module.NumpadWidget = module.PosBaseWidget.extend({
        template:'NumpadWidget',
        init: function(parent, options) {
            this._super(parent);
            this.state = new module.NumpadState();
            window.numpadstate = this.state;
            var self = this;
        },
        start: function() {
            this.state.bind('change:mode', this.changedMode, this);
            this.changedMode();
            this.$el.find('.numpad-backspace').click(_.bind(this.clickDeleteLastChar, this));
            this.$el.find('.numpad-minus').click(_.bind(this.clickSwitchSign, this));
            this.$el.find('.number-char').click(_.bind(this.clickAppendNewChar, this));
            this.$el.find('.mode-button').click(_.bind(this.clickChangeMode, this));
        },
        clickDeleteLastChar: function() {
            return this.state.deleteLastChar();
        },
        clickSwitchSign: function() {
            return this.state.switchSign();
        },
        clickAppendNewChar: function(event) {
            var newChar;
            newChar = event.currentTarget.innerText || event.currentTarget.textContent;
            return this.state.appendNewChar(newChar);
        },
        clickChangeMode: function(event) {
            var newMode = event.currentTarget.attributes['data-mode'].nodeValue;
            return this.state.changeMode(newMode);
        },
        changedMode: function() {
            var mode = this.state.get('mode');
            $('.selected-mode').removeClass('selected-mode');
            $(_.str.sprintf('.mode-button[data-mode="%s"]', mode), this.$el).addClass('selected-mode');
        },
    });

    // The paypad allows to select the payment method (cashregisters) 
    // used to pay the order.
    module.PaypadWidget = module.PosBaseWidget.extend({
        template: 'PaypadWidget',
        renderElement: function() {
            var self = this;
            this._super();

            _.each(this.pos.cashregisters,function(cashregister) {
                var button = new module.PaypadButtonWidget(self,{
                    pos: self.pos,
                    pos_widget : self.pos_widget,
                    cashregister: cashregister,
                });
                button.appendTo(self.$el);
            });
        }
    });

    module.PaypadButtonWidget = module.PosBaseWidget.extend({
        template: 'PaypadButtonWidget',
        init: function(parent, options){
            this._super(parent, options);
            this.cashregister = options.cashregister;
        },
        renderElement: function() {
            var self = this;
            this._super();

            this.$el.click(function(){
                if (self.pos.get('selectedOrder').get('screen') === 'receipt'){  //TODO Why ?
                    console.warn('TODO should not get there...?');
                    return;
                }
                self.pos.get('selectedOrder').addPaymentline(self.cashregister);
                self.pos_widget.screen_selector.set_current_screen('payment');
            });
        },
    });

    module.OrderWidget = module.PosBaseWidget.extend({
        template:'OrderWidget',
        init: function(parent, options) {
            var self = this;
            this._super(parent,options);
            this.editable = false;
            this.pos.bind('change:selectedOrder', this.change_selected_order, this);
            this.bind_orderline_events();
            this.line_click_handler = function(event){
                if(!self.editable){
                    return;
                }
                self.pos.get('selectedOrder').selectLine(this.orderline);
                self.pos_widget.numpad.state.reset();
            };
        },
        enable_numpad: function(){
            this.disable_numpad();  //ensure we don't register the callbacks twice
            this.numpad_state = this.pos_widget.numpad.state;
            if(this.numpad_state){
                this.numpad_state.reset();
                this.numpad_state.bind('set_value',   this.set_value, this);
            }
                    
        },
        disable_numpad: function(){
            if(this.numpad_state){
                this.numpad_state.unbind('set_value',  this.set_value);
                this.numpad_state.reset();
            }
        },
        set_editable: function(editable){
            this.editable = editable;
            if(editable){
                this.enable_numpad();
            }else{
                this.disable_numpad();
                this.pos.get('selectedOrder').deselectLine();
            }
        },
        set_value: function(val) {
        	var order = this.pos.get('selectedOrder');
        	if (this.editable && order.getSelectedLine()) {
                var mode = this.numpad_state.get('mode');
                if( mode === 'quantity'){
                    order.getSelectedLine().set_quantity(val);
                }else if( mode === 'discount'){
                    order.getSelectedLine().set_discount(val);
                }else if( mode === 'price'){
                    order.getSelectedLine().set_unit_price(val);
                }
        	}
        },
        change_selected_order: function() {
            this.bind_orderline_events();
            this.renderElement();
        },
        bind_orderline_events: function() {
            var lines = this.pos.get('selectedOrder').get('orderLines');
                lines.unbind();
                lines.bind('add', function(){ 
                        this.numpad_state.reset();
                        this.renderElement(true);
                    },this);
                lines.bind('remove', function(line){
                        this.remove_orderline(line);
                        this.numpad_state.reset();
                        this.update_summary();
                    },this);
                lines.bind('change', function(line){
                        this.rerender_orderline(line);
                        this.update_summary();
                    },this);
        },
        render_orderline: function(orderline){
            var el_str  = openerp.qweb.render('Orderline',{widget:this, line:orderline}); 
            var el_node = document.createElement('div');
                el_node.innerHTML = _.str.trim(el_str);
                el_node = el_node.childNodes[0];
                el_node.orderline = orderline;
                el_node.addEventListener('click',this.line_click_handler);

            orderline.node = el_node;
            return el_node;
        },
        remove_orderline: function(order_line){
            if(this.pos.get('selectedOrder').get('orderLines').length === 0){
                this.renderElement();
            }else{
                order_line.node.parentNode.removeChild(order_line.node);
            }
        },
        rerender_orderline: function(order_line){
            var node = order_line.node;
            var replacement_line = this.render_orderline(order_line);
            node.parentNode.replaceChild(replacement_line,node);
        },
        // overriding the openerp framework replace method for performance reasons
        replace: function($target){
            this.renderElement();
            var target = $target[0];
            target.parentNode.replaceChild(this.el,target);
        },
        renderElement: function(scrollbottom){
            this.pos_widget.numpad.state.reset();

            var order  = this.pos.get('selectedOrder');
            var orderlines = order.get('orderLines').models;

            var el_str  = openerp.qweb.render('OrderWidget',{widget:this, order:order, orderlines:orderlines});
            var el_node = document.createElement('div');
                el_node.innerHTML = _.str.trim(el_str);
                el_node = el_node.childNodes[0];

            var list_container = el_node.querySelector('.orderlines');
            for(var i = 0, len = orderlines.length; i < len; i++){
                var orderline = this.render_orderline(orderlines[i]);
                list_container.appendChild(orderline);
            }

            if(this.el && this.el.parentNode){
                this.el.parentNode.replaceChild(el_node,this.el);
            }
            this.el = el_node;
            this.update_summary();

            if(scrollbottom){
                this.el.querySelector('.order-scroller').scrollTop = 100 * orderlines.length;
            }
        },
        update_summary: function(){
            var order = this.pos.get('selectedOrder');
            var total     = order ? order.getTotalTaxIncluded() : 0;
            var taxes     = order ? total - order.getTotalTaxExcluded() : 0;

            this.el.querySelector('.summary .total > .value').textContent = this.format_currency(total);
            this.el.querySelector('.summary .total .subentry .value').textContent = this.format_currency(taxes);
        },
    });

    module.OrderButtonWidget = module.PosBaseWidget.extend({
        template:'OrderButtonWidget',
        init: function(parent, options) {
            this._super(parent,options);
            var self = this;

            this.order = options.order;
            this.order.bind('destroy',this.destroy, this );
            this.order.bind('change', this.renderElement, this );
            this.pos.bind('change:selectedOrder', this.renderElement,this );
        },
        renderElement:function(){
            this._super();
            var self = this;
            this.$el.click(function(){ 
                self.selectOrder();
            });
            if( this.order === this.pos.get('selectedOrder') ){
                this.$el.addClass('selected');
            }
        },
        selectOrder: function(event) {
            this.pos.set({
                selectedOrder: this.order
            });
        },
        destroy: function(){
            this.order.unbind('destroy', this.destroy, this);
            this.order.unbind('change',  this.renderElement, this);
            this.pos.unbind('change:selectedOrder', this.renderElement, this);
            this._super();
        },
    });

    module.ActionButtonWidget = instance.web.Widget.extend({
        template:'ActionButtonWidget',
        icon_template:'ActionButtonWidgetWithIcon',
        init: function(parent, options){
            this._super(parent, options);
            this.label = options.label || 'button';
            this.rightalign = options.rightalign || false;
            this.click_action = options.click;
            this.disabled = options.disabled || false;
            if(options.icon){
                this.icon = options.icon;
                this.template = this.icon_template;
            }
        },
        set_disabled: function(disabled){
            if(this.disabled != disabled){
                this.disabled = !!disabled;
                this.renderElement();
            }
        },
        renderElement: function(){
            this._super();
            if(this.click_action && !this.disabled){
                this.$el.click(_.bind(this.click_action, this));
            }
        },
    });

    module.ActionBarWidget = instance.web.Widget.extend({
        template:'ActionBarWidget',
        init: function(parent, options){
            this._super(parent,options);
            this.button_list = [];
            this.buttons = {};
            this.visibility = {};
        },
        set_element_visible: function(element, visible, action){
            if(visible != this.visibility[element]){
                this.visibility[element] = !!visible;
                if(visible){
                    this.$('.'+element).removeClass('oe_hidden');
                }else{
                    this.$('.'+element).addClass('oe_hidden');
                }
            }
            if(visible && action){
                this.action[element] = action;
                this.$('.'+element).off('click').click(action);
            }
        },
        set_button_disabled: function(name, disabled){
            var b = this.buttons[name];
            if(b){
                b.set_disabled(disabled);
            }
        },
        destroy_buttons:function(){
            for(var i = 0; i < this.button_list.length; i++){
                this.button_list[i].destroy();
            }
            this.button_list = [];
            this.buttons = {};
            return this;
        },
        get_button_count: function(){
            return this.button_list.length;
        },
        add_new_button: function(button_options){
            var button = new module.ActionButtonWidget(this,button_options);
            this.button_list.push(button);
            if(button_options.name){
                this.buttons[button_options.name] = button;
            }
            button.appendTo(this.$('.pos-actionbar-button-list'));
            return button;
        },
        show:function(){
            this.$el.removeClass('oe_hidden');
        },
        hide:function(){
            this.$el.addClass('oe_hidden');
        },
    });

    module.ProductCategoriesWidget = module.PosBaseWidget.extend({
        template: 'ProductCategoriesWidget',
        init: function(parent, options){
            var self = this;
            this._super(parent,options);
            this.product_type = options.product_type || 'all';  // 'all' | 'weightable'
            this.onlyWeightable = options.onlyWeightable || false;
            this.category = this.pos.root_category;
            this.breadcrumb = [];
            this.subcategories = [];
            this.product_list_widget = options.product_list_widget || null;
            this.category_cache = new module.DomCache();
            this.set_category();
            
            this.switch_category_handler = function(event){
                self.set_category(self.pos.db.get_category_by_id(Number(this.dataset['categoryId'])));
                self.renderElement();
            };
            
            this.clear_search_handler = function(event){
                self.clear_search();
            };

            var search_timeout  = null;
            this.search_handler = function(event){
                clearTimeout(search_timeout);

                var query = this.value;

                search_timeout = setTimeout(function(){
                    self.perform_search(self.category, query, event.which === 13);
                },70);
            };
        },

        // changes the category. if undefined, sets to root category
        set_category : function(category){
            var db = this.pos.db;
            if(!category){
                this.category = db.get_category_by_id(db.root_category_id);
            }else{
                this.category = category;
            }
            this.breadcrumb = [];
            var ancestors_ids = db.get_category_ancestors_ids(this.category.id);
            for(var i = 1; i < ancestors_ids.length; i++){
                this.breadcrumb.push(db.get_category_by_id(ancestors_ids[i]));
            }
            if(this.category.id !== db.root_category_id){
                this.breadcrumb.push(this.category);
            }
            this.subcategories = db.get_category_by_id(db.get_category_childs_ids(this.category.id));
        },

        get_image_url: function(category){
            return window.location.origin + '/web/binary/image?model=pos.category&field=image_medium&id='+category.id;
        },

        render_category: function( category, with_image ){
            var cached = this.category_cache.get_node(category.id);
            if(!cached){
                if(with_image){
                    var image_url = this.get_image_url(category);
                    var category_html = QWeb.render('CategoryButton',{ 
                            widget:  this, 
                            category: category, 
                            image_url: this.get_image_url(category),
                        });
                        category_html = _.str.trim(category_html);
                    var category_node = document.createElement('div');
                        category_node.innerHTML = category_html;
                        category_node = category_node.childNodes[0];
                }else{
                    var category_html = QWeb.render('CategorySimpleButton',{ 
                            widget:  this, 
                            category: category, 
                        });
                        category_html = _.str.trim(category_html);
                    var category_node = document.createElement('div');
                        category_node.innerHTML = category_html;
                        category_node = category_node.childNodes[0];
                }
                this.category_cache.cache_node(category.id,category_node);
                return category_node;
            }
            return cached; 
        },

        replace: function($target){
            this.renderElement();
            var target = $target[0];
            target.parentNode.replaceChild(this.el,target);
        },

        renderElement: function(){
            var self = this;

            var el_str  = openerp.qweb.render(this.template, {widget: this});
            var el_node = document.createElement('div');
                el_node.innerHTML = el_str;
                el_node = el_node.childNodes[1];

            if(this.el && this.el.parentNode){
                this.el.parentNode.replaceChild(el_node,this.el);
            }

            this.el = el_node;

            var hasimages = false;  //if none of the subcategories have images, we don't display buttons with icons
            for(var i = 0; i < this.subcategories.length; i++){
                if(this.subcategories[i].image){
                    hasimages = true;
                    break;
                }
            }

            var list_container = el_node.querySelector('.category-list');
            for(var i = 0, len = this.subcategories.length; i < len; i++){
                list_container.appendChild(this.render_category(this.subcategories[i],hasimages));
            };

            var buttons = el_node.querySelectorAll('.js-category-switch');
            for(var i = 0; i < buttons.length; i++){
                buttons[i].addEventListener('click',this.switch_category_handler);
            }

            var products = this.pos.db.get_product_by_category(this.category.id);
            this.product_list_widget.set_product_list(products);

            this.el.querySelector('.searchbox input').addEventListener('keyup',this.search_handler);

            this.el.querySelector('.search-clear').addEventListener('click',this.clear_search_handler);

            if(this.pos.config.iface_vkeyboard && this.pos_widget.onscreen_keyboard){
                this.pos_widget.onscreen_keyboard.connect($(this.el.querySelector('.searchbox input')));
            }
        },
        
        // resets the current category to the root category
        reset_category: function(){
            this.set_category();
            this.renderElement();
        },

        // empties the content of the search box
        clear_search: function(){
            var products = this.pos.db.get_product_by_category(this.category.id);
            this.product_list_widget.set_product_list(products);
            var input = this.el.querySelector('.searchbox input');
                input.value = '';
                input.focus();
        },
        perform_search: function(category, query, buy_result){
            if(query){
                var products = this.pos.db.search_product_in_category(category.id,query)
                if(buy_result && products.length === 1){
                        this.pos.get('selectedOrder').addProduct(products[0]);
                        this.clear_search();
                }else{
                    this.product_list_widget.set_product_list(products);
                }
            }else{
                var products = this.pos.db.get_product_by_category(this.category.id);
                this.product_list_widget.set_product_list(products);
            }
        },

    });

    module.ProductListWidget = module.PosBaseWidget.extend({
        template:'ProductListWidget',
        init: function(parent, options) {
            var self = this;
            this._super(parent,options);
            this.model = options.model;
            this.productwidgets = [];
            this.weight = options.weight || 0;
            this.show_scale = options.show_scale || false;
            this.next_screen = options.next_screen || false;

            this.click_product_handler = function(event){
                var product = self.pos.db.get_product_by_id(this.dataset['productId']);
                options.click_product_action(product);
            };

            this.product_list = options.product_list || [];
            this.product_cache = new module.DomCache();
        },
        set_product_list: function(product_list){
            this.product_list = product_list;
            this.renderElement();
        },
        get_product_image_url: function(product){
            return window.location.origin + '/web/binary/image?model=product.product&field=image_medium&id='+product.id;
        },
        replace: function($target){
            this.renderElement();
            var target = $target[0];
            target.parentNode.replaceChild(this.el,target);
        },

        render_product: function(product){
            var cached = this.product_cache.get_node(product.id);
            if(!cached){
                var image_url = this.get_product_image_url(product);
                var product_html = QWeb.render('Product',{ 
                        widget:  this, 
                        product: product, 
                        image_url: this.get_product_image_url(product),
                    });
                var product_node = document.createElement('div');
                product_node.innerHTML = product_html;
                product_node = product_node.childNodes[1];
                this.product_cache.cache_node(product.id,product_node);
                return product_node;
            }
            return cached;
        },

        renderElement: function() {
            var self = this;

            // this._super()
            var el_str  = openerp.qweb.render(this.template, {widget: this});
            var el_node = document.createElement('div');
                el_node.innerHTML = el_str;
                el_node = el_node.childNodes[1];

            if(this.el && this.el.parentNode){
                this.el.parentNode.replaceChild(el_node,this.el);
            }
            this.el = el_node;

            var list_container = el_node.querySelector('.product-list');
            for(var i = 0, len = this.product_list.length; i < len; i++){
                var product_node = this.render_product(this.product_list[i]);
                product_node.addEventListener('click',this.click_product_handler);
                list_container.appendChild(product_node);
            };
        },
    });

    module.UsernameWidget = module.PosBaseWidget.extend({
        template: 'UsernameWidget',
        init: function(parent, options){
            var options = options || {};
            this._super(parent,options);
            this.mode = options.mode || 'cashier';
        },
        set_user_mode: function(mode){
            this.mode = mode;
            this.refresh();
        },
        refresh: function(){
            this.renderElement();
        },
        get_name: function(){
            var user;
            if(this.mode === 'cashier'){
                user = this.pos.cashier || this.pos.user;
            }else{
                user = this.pos.get('selectedOrder').get_client()  || this.pos.user;
            }
            if(user){
                return user.name;
            }else{
                return "";
            }
        },
    });

    module.HeaderButtonWidget = module.PosBaseWidget.extend({
        template: 'HeaderButtonWidget',
        init: function(parent, options){
            options = options || {};
            this._super(parent, options);
            this.action = options.action;
            this.label   = options.label;
        },
        renderElement: function(){
            var self = this;
            this._super();
            if(this.action){
                this.$el.click(function(){
                    self.action();
                });
            }
        },
        show: function(){ this.$el.removeClass('oe_hidden'); },
        hide: function(){ this.$el.addClass('oe_hidden'); },
    });

    // The debug widget lets the user control and monitor the hardware and software status
    // without the use of the proxy
    module.DebugWidget = module.PosBaseWidget.extend({
        template: "DebugWidget",
        eans:{
            admin_badge:  '0410100000006',
            client_badge: '0420200000004',
            invalid_ean:  '1232456',
            soda_33cl:    '5449000000996',
            oranges_kg:   '2100002031410',
            lemon_price:  '2301000001560',
            unknown_product: '9900000000004',
        },
        events:[
            'scan_item_success',
            'scan_item_error_unrecognized',
            'payment_request',
            'open_cashbox',
            'print_receipt',
            'print_pdf_invoice',
            'scale_read',
            'payment_status',
        ],
        minimized: false,
        init: function(parent,options){
            this._super(parent,options);
            var self = this;
            
            this.minimized = false;

            // for dragging the debug widget around
            this.dragging  = false;
            this.dragpos = {x:0, y:0};

            function eventpos(event){
                if(event.touches && event.touches[0]){
                    return {x: event.touches[0].screenX, y: event.touches[0].screenY};
                }else{
                    return {x: event.screenX, y: event.screenY};
                }
            }

            this.dragend_handler = function(event){
                self.dragging = false;
            };
            this.dragstart_handler = function(event){
                self.dragging = true;
                self.dragpos = eventpos(event);
            };
            this.dragmove_handler = function(event){
                if(self.dragging){
                    var top = this.offsetTop;
                    var left = this.offsetLeft;
                    var pos  = eventpos(event);
                    var dx   = pos.x - self.dragpos.x; 
                    var dy   = pos.y - self.dragpos.y; 

                    self.dragpos = pos;

                    this.style.right = 'auto';
                    this.style.bottom = 'auto';
                    this.style.left = left + dx + 'px';
                    this.style.top  = top  + dy + 'px';
                }
                event.preventDefault();
                event.stopPropagation();
            };
        },
        start: function(){
            var self = this;

            this.el.addEventListener('mouseleave', this.dragend_handler);
            this.el.addEventListener('mouseup',    this.dragend_handler);
            this.el.addEventListener('touchend',   this.dragend_handler);
            this.el.addEventListener('touchcancel',this.dragend_handler);
            this.el.addEventListener('mousedown',  this.dragstart_handler);
            this.el.addEventListener('touchstart', this.dragstart_handler);
            this.el.addEventListener('mousemove',  this.dragmove_handler);
            this.el.addEventListener('touchmove',  this.dragmove_handler);

            this.$('.toggle').click(function(){
                var content = self.$('.content');
                var bg      = self.$el;
                if(!self.minimized){
                    content.animate({'height':'0'},200);
                }else{
                    content.css({'height':'auto'});
                }
                self.minimized = !self.minimized;
            });
            this.$('.button.accept_payment').click(function(){
                self.pos.proxy.debug_accept_payment();
            });
            this.$('.button.reject_payment').click(function(){
                self.pos.proxy.debug_reject_payment();
            });
            this.$('.button.set_weight').click(function(){
                var kg = Number(self.$('input.weight').val());
                if(!isNaN(kg)){
                    self.pos.proxy.debug_set_weight(kg);
                }
            });
            this.$('.button.reset_weight').click(function(){
                self.$('input.weight').val('');
                self.pos.proxy.debug_reset_weight();
            });
            this.$('.button.custom_ean').click(function(){
                var ean = self.pos.barcode_reader.sanitize_ean(self.$('input.ean').val() || '0');
                self.$('input.ean').val(ean);
                self.pos.barcode_reader.scan('ean13',ean);
            });
            this.$('.button.reference').click(function(){
                self.pos.barcode_reader.scan('reference',self.$('input.ean').val());
            });
            _.each(this.eans, function(ean, name){
                self.$('.button.'+name).click(function(){
                    self.$('input.ean').val(ean);
                    self.pos.barcode_reader.scan('ean13',ean);
                });
            });
            _.each(this.events, function(name){
                self.pos.proxy.add_notification(name,function(){
                    self.$('.event.'+name).stop().clearQueue().css({'background-color':'#6CD11D'}); 
                    self.$('.event.'+name).animate({'background-color':'#1E1E1E'},2000);
                });
            });
            self.pos.proxy.add_notification('help_needed',function(){
                self.$('.status.help_needed').addClass('on');
            });
            self.pos.proxy.add_notification('help_canceled',function(){
                self.$('.status.help_needed').removeClass('on');
            });
            self.pos.proxy.add_notification('transaction_start',function(){
                self.$('.status.transaction').addClass('on');
            });
            self.pos.proxy.add_notification('transaction_end',function(){
                self.$('.status.transaction').removeClass('on');
            });
        },
    });

// ---------- Main Point of Sale Widget ----------

    module.StatusWidget = module.PosBaseWidget.extend({
        status: ['connected','connecting','disconnected','warning'],
        set_status: function(status,msg){
            var self = this;
            for(var i = 0; i < this.status.length; i++){
                this.$('.js_'+this.status[i]).addClass('oe_hidden');
            }
            this.$('.js_'+status).removeClass('oe_hidden');
            
            if(msg){
                this.$('.js_msg').removeClass('oe_hidden').html(msg);
            }else{
                this.$('.js_msg').addClass('oe_hidden').html('');
            }
        },
    });

    // this is used to notify the user that data is being synchronized on the network
    module.SynchNotificationWidget = module.StatusWidget.extend({
        template: 'SynchNotificationWidget',
        start: function(){
            var self = this;
            this.pos.bind('change:synch', function(pos,synch){
                self.set_status(synch.state, synch.pending);
            });
            this.$el.click(function(){
                self.pos.flush();
            });
        },
    });

    // this is used to notify the user if the pos is connected to the proxy
    module.ProxyStatusWidget = module.StatusWidget.extend({
        template: 'ProxyStatusWidget',
        set_smart_status: function(status){
            if(status.status === 'connected'){
                var warning = false;
                var msg = ''
                if(this.pos.config.iface_scan_via_proxy){
                    var scanner = status.drivers.scanner ? status.drivers.scanner.status : false;
                    if( scanner != 'connected' && scanner != 'connecting'){
                        warning = true;
                        msg += _t('Scanner');
                    }
                }
                if( this.pos.config.iface_print_via_proxy || 
                    this.pos.config.iface_cashdrawer ){
                    var printer = status.drivers.escpos ? status.drivers.escpos.status : false;
                    if( printer != 'connected' && printer != 'connecting'){
                        warning = true;
                        msg = msg ? msg + ' & ' : msg;
                        msg += _t('Printer');
                    }
                }
                if( this.pos.config.iface_electronic_scale ){
                    var scale = status.drivers.scale ? status.drivers.scale.status : false;
                    if( scale != 'connected' && scale != 'connecting' ){
                        warning = true;
                        msg = msg ? msg + ' & ' : msg;
                        msg += _t('Scale');
                    }
                }
                msg = msg ? msg + ' ' + _t('Offline') : msg;
                this.set_status(warning ? 'warning' : 'connected', msg);
            }else{
                this.set_status(status.status,'');
            }
        },
        start: function(){
            var self = this;
            
            this.set_smart_status(this.pos.proxy.get('status'));

            this.pos.proxy.on('change:status',this,function(eh,status){ //FIXME remove duplicate changes 
                self.set_smart_status(status.newValue);
            });

            this.$el.click(function(){
                self.pos.connect_to_proxy();
            });
        },
    });


    // The PosWidget is the main widget that contains all other widgets in the PointOfSale.
    // It is mainly composed of :
    // - a header, containing the list of orders
    // - a leftpane, containing the list of bought products (orderlines) 
    // - a rightpane, containing the screens (see pos_screens.js)
    // - an actionbar on the bottom, containing various action buttons
    // - popups
    // - an onscreen keyboard
    // a screen_selector which controls the switching between screens and the showing/closing of popups

    module.PosWidget = module.PosBaseWidget.extend({
        template: 'PosWidget',
        init: function() { 
            this._super(arguments[0],{});

            this.pos = new module.PosModel(this.session,{pos_widget:this});
            this.pos_widget = this; //So that pos_widget's childs have pos_widget set automatically

            this.numpad_visible = true;
            this.left_action_bar_visible = true;
            this.leftpane_visible = true;
            this.leftpane_width   = '440px';
            this.cashier_controls_visible = true;

            FastClick.attach(document.body);

        },

        disable_rubberbanding: function(){
            // prevent the pos body from being scrollable. 
            document.body.addEventListener('touchmove',function(event){
                var node = event.target;
                while(node){
                    if(node.classList && node.classList.contains('touch-scrollable')){
                        return;
                    }
                    node = node.parentNode;
                }
                event.preventDefault();
            });
        },

        start: function() {
            var self = this;
            return self.pos.ready.done(function() {
                // remove default webclient handlers that induce click delay
                $(document).off();
                $(window).off();
                $('html').off();
                $('body').off();
                $(self.$el).parent().off();
                $('document').off();
                $('.oe_web_client').off();
                $('.openerp_webclient_container').off();

                self.build_currency_template();
                self.renderElement();
                
                self.$('.neworder-button').click(function(){
                    self.pos.add_new_order();
                });

                self.$('.deleteorder-button').click(function(){
                    self.pos.delete_current_order();
                });
                
                //when a new order is created, add an order button widget
                self.pos.get('orders').bind('add', function(new_order){
                    var new_order_button = new module.OrderButtonWidget(null, {
                        order: new_order,
                        pos: self.pos
                    });
                    new_order_button.appendTo(this.$('.orders'));
                    new_order_button.selectOrder();
                }, self);

                self.pos.add_new_order();

                self.build_widgets();

                if(self.pos.config.iface_big_scrollbars){
                    self.$el.addClass('big-scrollbars');
                }

                self.screen_selector.set_default_screen();

                self.pos.barcode_reader.connect();

                instance.webclient.set_content_full_screen(true);

                if (!self.pos.session) {
                    self.screen_selector.show_popup('error', 'Sorry, we could not create a user session');
                }else if(!self.pos.config){
                    self.screen_selector.show_popup('error', 'Sorry, we could not find any PoS Configuration for this session');
                }
            
                self.$('.loader').animate({opacity:0},1500,'swing',function(){self.$('.loader').addClass('oe_hidden');});

                self.pos.flush();

            }).fail(function(){   // error when loading models data from the backend
                return new instance.web.Model("ir.model.data").get_func("search_read")([['name', '=', 'action_pos_session_opening']], ['res_id'])
                    .pipe( _.bind(function(res){
                        return instance.session.rpc('/web/action/load', {'action_id': res[0]['res_id']})
                            .pipe(_.bind(function(result){
                                var action = result.result;
                                this.do_action(action);
                            }, this));
                    }, self));
            });
        },
        loading_progress: function(fac){
            this.$('.loader .loader-feedback').removeClass('oe_hidden');
            this.$('.loader .progress').css({'width': ''+Math.floor(fac*100)+'%'});
        },
        loading_message: function(msg,progress){
            this.$('.loader .loader-feedback').removeClass('oe_hidden');
            this.$('.loader .message').text(msg);
            if(typeof progress !== 'undefined'){
                this.loading_progress(progress);
            }
        },
        loading_skip: function(callback){
            if(callback){
                this.$('.loader .loader-feedback').removeClass('oe_hidden');
                this.$('.loader .button.skip').removeClass('oe_hidden');
                this.$('.loader .button.skip').off('click');
                this.$('.loader .button.skip').click(callback);
            }else{
                this.$('.loader .button.skip').addClass('oe_hidden');
            }
        },
        // This method instantiates all the screens, widgets, etc. If you want to add new screens change the
        // startup screen, etc, override this method.
        build_widgets: function() {
            var self = this;

            // --------  Screens ---------

            this.product_screen = new module.ProductScreenWidget(this,{});
            this.product_screen.appendTo(this.$('.screens'));

            this.receipt_screen = new module.ReceiptScreenWidget(this, {});
            this.receipt_screen.appendTo(this.$('.screens'));

            this.payment_screen = new module.PaymentScreenWidget(this, {});
            this.payment_screen.appendTo(this.$('.screens'));

            this.welcome_screen = new module.WelcomeScreenWidget(this,{});
            this.welcome_screen.appendTo(this.$('.screens'));

            this.client_payment_screen = new module.ClientPaymentScreenWidget(this, {});
            this.client_payment_screen.appendTo(this.$('.screens'));

            this.scale_invite_screen = new module.ScaleInviteScreenWidget(this, {});
            this.scale_invite_screen.appendTo(this.$('.screens'));

            this.scale_screen = new module.ScaleScreenWidget(this,{});
            this.scale_screen.appendTo(this.$('.screens'));

            // --------  Popups ---------

            this.help_popup = new module.HelpPopupWidget(this, {});
            this.help_popup.appendTo(this.$el);

            this.error_popup = new module.ErrorPopupWidget(this, {});
            this.error_popup.appendTo(this.$el);

            this.error_product_popup = new module.ProductErrorPopupWidget(this, {});
            this.error_product_popup.appendTo(this.$el);

            this.error_session_popup = new module.ErrorSessionPopupWidget(this, {});
            this.error_session_popup.appendTo(this.$el);

            this.choose_receipt_popup = new module.ChooseReceiptPopupWidget(this, {});
            this.choose_receipt_popup.appendTo(this.$el);

            this.error_negative_price_popup = new module.ErrorNegativePricePopupWidget(this, {});
            this.error_negative_price_popup.appendTo(this.$el);

            this.error_no_client_popup = new module.ErrorNoClientPopupWidget(this, {});
            this.error_no_client_popup.appendTo(this.$el);

            this.error_invoice_transfer_popup = new module.ErrorInvoiceTransferPopupWidget(this, {});
            this.error_invoice_transfer_popup.appendTo(this.$el);

            // --------  Misc ---------

            this.close_button = new module.HeaderButtonWidget(this,{
                label: _t('Close'),
                action: function(){ self.close(); },
            });
            this.close_button.appendTo(this.$('.pos-rightheader'));

            this.notification = new module.SynchNotificationWidget(this,{});
            this.notification.appendTo(this.$('.pos-rightheader'));

            if(this.pos.config.use_proxy){
                this.proxy_status = new module.ProxyStatusWidget(this,{});
                this.proxy_status.appendTo(this.$('.pos-rightheader'));
            }

            this.username   = new module.UsernameWidget(this,{});
            this.username.replace(this.$('.placeholder-UsernameWidget'));

            this.action_bar = new module.ActionBarWidget(this);
            this.action_bar.replace(this.$(".placeholder-RightActionBar"));

            this.left_action_bar = new module.ActionBarWidget(this);
            this.left_action_bar.replace(this.$('.placeholder-LeftActionBar'));

            this.paypad = new module.PaypadWidget(this, {});
            this.paypad.replace(this.$('.placeholder-PaypadWidget'));

            this.numpad = new module.NumpadWidget(this);
            this.numpad.replace(this.$('.placeholder-NumpadWidget'));

            this.order_widget = new module.OrderWidget(this, {});
            this.order_widget.replace(this.$('.placeholder-OrderWidget'));

            this.onscreen_keyboard = new module.OnscreenKeyboardWidget(this, {
                'keyboard_model': 'simple'
            });
            this.onscreen_keyboard.replace(this.$('.placeholder-OnscreenKeyboardWidget'));

            this.client_button = new module.HeaderButtonWidget(this,{
                label: _t('Self-Checkout'),
                action: function(){ self.screen_selector.set_user_mode('client'); },
            });
            this.client_button.appendTo(this.$('.pos-rightheader'));

            
            // --------  Screen Selector ---------

            this.screen_selector = new module.ScreenSelector({
                pos: this.pos,
                screen_set:{
                    'products': this.product_screen,
                    'payment' : this.payment_screen,
                    'client_payment' : this.client_payment_screen,
                    'scale_invite' : this.scale_invite_screen,
                    'scale':    this.scale_screen,
                    'receipt' : this.receipt_screen,
                    'welcome' : this.welcome_screen,
                },
                popup_set:{
                    'help': this.help_popup,
                    'error': this.error_popup,
                    'error-product': this.error_product_popup,
                    'error-session': this.error_session_popup,
                    'error-negative-price': this.error_negative_price_popup,
                    'choose-receipt': this.choose_receipt_popup,
                    'error-no-client': this.error_no_client_popup,
                    'error-invoice-transfer': this.error_invoice_transfer_popup,
                },
                default_client_screen: 'welcome',
                default_cashier_screen: 'products',
                default_mode: this.pos.config.iface_self_checkout ?  'client' : 'cashier',
            });

            if(this.pos.debug){
                this.debug_widget = new module.DebugWidget(this);
                this.debug_widget.appendTo(this.$('.pos-content'));
            }

            this.disable_rubberbanding();

        },

        changed_pending_operations: function () {
            var self = this;
            this.synch_notification.on_change_nbr_pending(self.pos.get('nbr_pending_operations').length);
        },
        // shows or hide the numpad and related controls like the paypad.
        set_numpad_visible: function(visible){
            if(visible !== this.numpad_visible){
                this.numpad_visible = visible;
                if(visible){
                    this.set_left_action_bar_visible(false);
                    this.numpad.show();
                    this.paypad.show();
                }else{
                    this.numpad.hide();
                    this.paypad.hide();
                }
            }
        },
        set_left_action_bar_visible: function(visible){
            if(visible !== this.left_action_bar_visible){
                this.left_action_bar_visible = visible;
                if(visible){
                    this.set_numpad_visible(false);
                    this.left_action_bar.show();
                }else{
                    this.left_action_bar.hide();
                }
            }
        },
        //shows or hide the leftpane (contains the list of orderlines, the numpad, the paypad, etc.)
        set_leftpane_visible: function(visible){
            if(visible !== this.leftpane_visible){
                this.leftpane_visible = visible;
                if(visible){
                    this.$('.pos-leftpane').removeClass('oe_hidden').animate({'width':this.leftpane_width},500,'swing');
                    this.$('.pos-rightpane').animate({'left':this.leftpane_width},500,'swing');
                }else{
                    var leftpane = this.$('.pos-leftpane');
                    leftpane.animate({'width':'0px'},500,'swing', function(){ leftpane.addClass('oe_hidden'); });
                    this.$('.pos-rightpane').animate({'left':'0px'},500,'swing');
                }
            }
        },
        //shows or hide the controls in the PosWidget that are specific to the cashier ( Orders, close button, etc. ) 
        set_cashier_controls_visible: function(visible){
            if(visible !== this.cashier_controls_visible){
                this.cashier_controls_visible = visible;
                if(visible){
                    this.$('.pos-rightheader').removeClass('oe_hidden');
                }else{
                    this.$('.pos-rightheader').addClass('oe_hidden');
                }
            }
        },
        close: function() {
            var self = this;

            function close(){
                return new instance.web.Model("ir.model.data").get_func("search_read")([['name', '=', 'action_client_pos_menu']], ['res_id']).pipe(function(res) {
                    window.location = '/web#action=' + res[0]['res_id'];
                });
            }

            var draft_order = _.find( self.pos.get('orders').models, function(order){
                return order.get('orderLines').length !== 0 && order.get('paymentLines').length === 0;
            });
            if(draft_order){
                if (confirm(_t("Pending orders will be lost.\nAre you sure you want to leave this session?"))) {
                    return close();
                }
            }else{
                return close();
            }
        },
        destroy: function() {
            this.pos.destroy();
            instance.webclient.set_content_full_screen(false);
            this._super();
        }
    });
}