addons/point_of_sale/static/src/js/models.js

   1 function openerp_pos_models(instance, module){ //module is instance.point_of_sale
   2     var QWeb = instance.web.qweb;
   3         var _t = instance.web._t;
   4
   5     var round_di = instance.web.round_decimals;
   6     var round_pr = instance.web.round_precision
   7
   8     // The PosModel contains the Point Of Sale's representation of the backend.
   9     // Since the PoS must work in standalone ( Without connection to the server )
  10     // it must contains a representation of the server's PoS backend.
  11     // (taxes, product list, configuration options, etc.)  this representation
  12     // is fetched and stored by the PosModel at the initialisation.
  13     // this is done asynchronously, a ready deferred alows the GUI to wait interactively
  14     // for the loading to be completed
  15     // There is a single instance of the PosModel for each Front-End instance, it is usually called
  16     // 'pos' and is available to all widgets extending PosWidget.
  17
  18     module.PosModel = Backbone.Model.extend({
  19         initialize: function(session, attributes) {
  20             Backbone.Model.prototype.initialize.call(this, attributes);
  21             var  self = this;
  22             this.session = session;
  23             this.flush_mutex = new $.Mutex();                   // used to make sure the orders are sent to the server once at time
  24             this.pos_widget = attributes.pos_widget;
  25
  26             this.proxy = new module.ProxyDevice(this);              // used to communicate to the hardware devices via a local proxy
  27             this.barcode_reader = new module.BarcodeReader({'pos': this, proxy:this.proxy, patterns: {}});  // used to read barcodes
  28             this.proxy_queue = new module.JobQueue();           // used to prevent parallels communications to the proxy
  29             this.db = new module.PosDB();                       // a local database used to search trough products and categories & store pending orders
  30             this.debug = jQuery.deparam(jQuery.param.querystring()).debug !== undefined;    //debug mode
  31
  32             // Business data; loaded from the server at launch
  33             this.accounting_precision = 2; //TODO
  34             this.company_logo = null;
  35             this.company_logo_base64 = '';
  36             this.currency = null;
  37             this.shop = null;
  38             this.company = null;
  39             this.user = null;
  40             this.users = [];
  41             this.partners = [];
  42             this.cashier = null;
  43             this.cashregisters = [];
  44             this.bankstatements = [];
  45             this.taxes = [];
  46             this.pos_session = null;
  47             this.config = null;
  48             this.units = [];
  49             this.units_by_id = {};
  50             this.pricelist = null;
  51             this.order_sequence = 1;
  52             window.posmodel = this;
  53
  54             // these dynamic attributes can be watched for change by other models or widgets
  55             this.set({
  56                 'synch':            { state:'connected', pending:0 },
  57                 'orders':           new module.OrderCollection(),
  58                 'selectedOrder':    null,
  59             });
  60
  61             this.bind('change:synch',function(pos,synch){
  62                 clearTimeout(self.synch_timeout);
  63                 self.synch_timeout = setTimeout(function(){
  64                     if(synch.state !== 'disconnected' && synch.pending > 0){
  65                         self.set('synch',{state:'disconnected', pending:synch.pending});
  66                     }
  67                 },3000);
  68             });
  69
  70             this.get('orders').bind('remove', function(order,_unused_,options){
  71                 self.on_removed_order(order,options.index,options.reason);
  72             });
  73
  74             // We fetch the backend data on the server asynchronously. this is done only when the pos user interface is launched,
  75             // Any change on this data made on the server is thus not reflected on the point of sale until it is relaunched.
  76             // when all the data has loaded, we compute some stuff, and declare the Pos ready to be used.
  77             this.ready = this.load_server_data()
  78                 .then(function(){
  79                     if(self.config.use_proxy){
  80                         return self.connect_to_proxy();
  81                     }
  82                 });
  83
  84         },
  85
  86         // releases ressources holds by the model at the end of life of the posmodel
  87         destroy: function(){
  88             // FIXME, should wait for flushing, return a deferred to indicate successfull destruction
  89             // this.flush();
  90             this.proxy.close();
  91             this.barcode_reader.disconnect();
  92             this.barcode_reader.disconnect_from_proxy();
  93         },
  94         connect_to_proxy: function(){
  95             var self = this;
  96             var  done = new $.Deferred();
  97             this.barcode_reader.disconnect_from_proxy();
  98             this.pos_widget.loading_message(_t('Connecting to the PosBox'),0);
  99             this.pos_widget.loading_skip(function(){
 100                     self.proxy.stop_searching();
 101                 });
 102             this.proxy.autoconnect({
 103                     force_ip: self.config.proxy_ip || undefined,
 104                     progress: function(prog){
 105                         self.pos_widget.loading_progress(prog);
 106                     },
 107                 }).then(function(){
 108                     if(self.config.iface_scan_via_proxy){
 109                         self.barcode_reader.connect_to_proxy();
 110                     }
 111                 }).always(function(){
 112                     done.resolve();
 113                 });
 114             return done;
 115         },
 116
 117         // helper function to load data from the server. Obsolete use the models loader below.
 118         fetch: function(model, fields, domain, ctx){
 119             this._load_progress = (this._load_progress || 0) + 0.05;
 120             this.pos_widget.loading_message(_t('Loading')+' '+model,this._load_progress);
 121             return new instance.web.Model(model).query(fields).filter(domain).context(ctx).all()
 122         },
 123
 124         // Server side model loaders. This is the list of the models that need to be loaded from
 125         // the server. The models are loaded one by one by this list's order. The 'loaded' callback
 126         // is used to store the data in the appropriate place once it has been loaded. This callback
 127         // can return a deferred that will pause the loading of the next module.
 128         // a shared temporary dictionary is available for loaders to communicate private variables
 129         // used during loading such as object ids, etc.
 130         models: [
 131         {
 132             model:  'res.users',
 133             fields: ['name','company_id'],
 134             ids:    function(self){ return [self.session.uid]; },
 135             loaded: function(self,users){ self.user = users[0]; },
 136         },{
 137             model:  'res.company',
 138             fields: [ 'currency_id', 'email', 'website', 'company_registry', 'vat', 'name', 'phone', 'partner_id' , 'country_id'],
 139             ids:    function(self){ return [self.user.company_id[0]] },
 140             loaded: function(self,companies){ self.company = companies[0]; },
 141         },{
 142             model:  'decimal.precision',
 143             fields: ['name','digits'],
 144             loaded: function(self,dps){
 145                 self.dp  = {};
 146                 for (var i = 0; i < dps.length; i++) {
 147                     self.dp[dps[i].name] = dps[i].digits;
 148                 }
 149             },
 150         },{
 151             model:  'product.uom',
 152             fields: [],
 153             domain: null,
 154             loaded: function(self,units){
 155                 self.units = units;
 156                 var units_by_id = {};
 157                 for(var i = 0, len = units.length; i < len; i++){
 158                     units_by_id[units[i].id] = units[i];
 159                     units[i].groupable = ( units[i].category_id[0] === 1 );
 160                     units[i].is_unit   = ( units[i].id === 1 );
 161                 }
 162                 self.units_by_id = units_by_id;
 163             }
 164         },{
 165             model:  'res.users',
 166             fields: ['name','ean13'],
 167             domain: null,
 168             loaded: function(self,users){ self.users = users; },
 169         },{
 170             model:  'res.partner',
 171             fields: ['name','street','city','state_id','country_id','vat','phone','zip','mobile','email','ean13','write_date'],
 172             domain: null,
 173             loaded: function(self,partners){
 174                 self.partners = partners;
 175                 self.db.add_partners(partners);
 176             },
 177         },{
 178             model:  'res.country',
 179             fields: ['name'],
 180             loaded: function(self,countries){
 181                 self.countries = countries;
 182                 self.company.country = null;
 183                 for (var i = 0; i < countries.length; i++) {
 184                     if (countries[i].id === self.company.country_id[0]){
 185                         self.company.country = countries[i];
 186                     }
 187                 }
 188             },
 189         },{
 190             model:  'account.tax',
 191             fields: ['name','amount', 'price_include', 'type'],
 192             domain: null,
 193             loaded: function(self,taxes){ self.taxes = taxes; },
 194         },{
 195             model:  'pos.session',
 196             fields: ['id', 'journal_ids','name','user_id','config_id','start_at','stop_at','sequence_number','login_number'],
 197             domain: function(self){ return [['state','=','opened'],['user_id','=',self.session.uid]]; },
 198             loaded: function(self,pos_sessions){
 199                 self.pos_session = pos_sessions[0];
 200
 201                 var orders = self.db.get_orders();
 202                 for (var i = 0; i < orders.length; i++) {
 203                     self.pos_session.sequence_number = Math.max(self.pos_session.sequence_number, orders[i].data.sequence_number+1);
 204                 }
 205             },
 206         },{
 207             model: 'pos.config',
 208             fields: [],
 209             domain: function(self){ return [['id','=', self.pos_session.config_id[0]]]; },
 210             loaded: function(self,configs){
 211                 self.config = configs[0];
 212                 self.config.use_proxy = self.config.iface_payment_terminal ||
 213                                         self.config.iface_electronic_scale ||
 214                                         self.config.iface_print_via_proxy  ||
 215                                         self.config.iface_scan_via_proxy   ||
 216                                         self.config.iface_cashdrawer;
 217
 218                 self.barcode_reader.add_barcode_patterns({
 219                     'product':  self.config.barcode_product,
 220                     'cashier':  self.config.barcode_cashier,
 221                     'client':   self.config.barcode_customer,
 222                     'weight':   self.config.barcode_weight,
 223                     'discount': self.config.barcode_discount,
 224                     'price':    self.config.barcode_price,
 225                 });
 226
 227                 if (self.config.company_id[0] !== self.user.company_id[0]) {
 228                     throw new Error(_t("Error: The Point of Sale User must belong to the same company as the Point of Sale. You are probably trying to load the point of sale as an administrator in a multi-company setup, with the administrator account set to the wrong company."));
 229                 }
 230             },
 231         },{
 232             model: 'stock.location',
 233             fields: [],
 234             ids:    function(self){ return [self.config.stock_location_id[0]]; },
 235             loaded: function(self, locations){ self.shop = locations[0]; },
 236         },{
 237             model:  'product.pricelist',
 238             fields: ['currency_id'],
 239             ids:    function(self){ return [self.config.pricelist_id[0]]; },
 240             loaded: function(self, pricelists){ self.pricelist = pricelists[0]; },
 241         },{
 242             model: 'res.currency',
 243             fields: ['symbol','position','rounding','accuracy'],
 244             ids:    function(self){ return [self.pricelist.currency_id[0]]; },
 245             loaded: function(self, currencies){
 246                 self.currency = currencies[0];
 247                 if (self.currency.rounding > 0) {
 248                     self.currency.decimals = Math.ceil(Math.log(1.0 / self.currency.rounding) / Math.log(10));
 249                 } else {
 250                     self.currency.decimals = 0;
 251                 }
 252
 253             },
 254         },{
 255             model: 'product.packaging',
 256             fields: ['ean','product_tmpl_id'],
 257             domain: null,
 258             loaded: function(self, packagings){
 259                 self.db.add_packagings(packagings);
 260             },
 261         },{
 262             model:  'pos.category',
 263             fields: ['id','name','parent_id','child_id','image'],
 264             domain: null,
 265             loaded: function(self, categories){
 266                 self.db.add_categories(categories);
 267             },
 268         },{
 269             model:  'product.product',
 270             fields: ['display_name', 'list_price','price','pos_categ_id', 'taxes_id', 'ean13', 'default_code',
 271                      'to_weight', 'uom_id', 'uos_id', 'uos_coeff', 'mes_type', 'description_sale', 'description',
 272                      'product_tmpl_id'],
 273             domain:  function(self){ return [['sale_ok','=',true],['available_in_pos','=',true]]; },
 274             context: function(self){ return { pricelist: self.pricelist.id, display_default_code: false }; },
 275             loaded: function(self, products){
 276                 self.db.add_products(products);
 277             },
 278         },{
 279             model:  'account.bank.statement',
 280             fields: ['account_id','currency','journal_id','state','name','user_id','pos_session_id'],
 281             domain: function(self){ return [['state', '=', 'open'],['pos_session_id', '=', self.pos_session.id]]; },
 282             loaded: function(self, bankstatements, tmp){
 283                 self.bankstatements = bankstatements;
 284
 285                 tmp.journals = [];
 286                 _.each(bankstatements,function(statement){
 287                     tmp.journals.push(statement.journal_id[0]);
 288                 });
 289             },
 290         },{
 291             model:  'account.journal',
 292             fields: [],
 293             domain: function(self,tmp){ return [['id','in',tmp.journals]]; },
 294             loaded: function(self, journals){
 295                 self.journals = journals;
 296
 297                 // associate the bank statements with their journals.
 298                 var bankstatements = self.bankstatements;
 299                 for(var i = 0, ilen = bankstatements.length; i < ilen; i++){
 300                     for(var j = 0, jlen = journals.length; j < jlen; j++){
 301                         if(bankstatements[i].journal_id[0] === journals[j].id){
 302                             bankstatements[i].journal = journals[j];
 303                         }
 304                     }
 305                 }
 306                 self.cashregisters = bankstatements;
 307             },
 308         },{
 309             label: 'fonts',
 310             loaded: function(self){
 311                 var fonts_loaded = new $.Deferred();
 312                 // Waiting for fonts to be loaded to prevent receipt printing
 313                 // from printing empty receipt while loading Inconsolata
 314                 // ( The font used for the receipt )
 315                 waitForWebfonts(['Lato','Inconsolata'], function(){
 316                     fonts_loaded.resolve();
 317                 });
 318                 // The JS used to detect font loading is not 100% robust, so
 319                 // do not wait more than 5sec
 320                 setTimeout(function(){
 321                     fonts_loaded.resolve();
 322                 },5000);
 323
 324                 return fonts_loaded;
 325             },
 326         },{
 327             label: 'pictures',
 328             loaded: function(self){
 329                 self.company_logo = new Image();
 330                 var  logo_loaded = new $.Deferred();
 331                 self.company_logo.onload = function(){
 332                     var img = self.company_logo;
 333                     var ratio = 1;
 334                     var targetwidth = 300;
 335                     var maxheight = 150;
 336                     if( img.width !== targetwidth ){
 337                         ratio = targetwidth / img.width;
 338                     }
 339                     if( img.height * ratio > maxheight ){
 340                         ratio = maxheight / img.height;
 341                     }
 342                     var width  = Math.floor(img.width * ratio);
 343                     var height = Math.floor(img.height * ratio);
 344                     var c = document.createElement('canvas');
 345                         c.width  = width;
 346                         c.height = height
 347                     var ctx = c.getContext('2d');
 348                         ctx.drawImage(self.company_logo,0,0, width, height);
 349
 350                     self.company_logo_base64 = c.toDataURL();
 351                     logo_loaded.resolve();
 352                 };
 353                 self.company_logo.onerror = function(){
 354                     logo_loaded.reject();
 355                 };
 356                     self.company_logo.crossOrigin = "anonymous";
 357                 self.company_logo.src = '/web/binary/company_logo' +'?_'+Math.random();
 358
 359                 return logo_loaded;
 360             },
 361         },
 362         ],
 363
 364         // loads all the needed data on the sever. returns a deferred indicating when all the data has loaded.
 365         load_server_data: function(){
 366             var self = this;
 367             var loaded = new $.Deferred();
 368             var progress = 0;
 369             var progress_step = 1.0 / self.models.length;
 370             var tmp = {}; // this is used to share a temporary state between models loaders
 371
 372             function load_model(index){
 373                 if(index >= self.models.length){
 374                     loaded.resolve();
 375                 }else{
 376                     var model = self.models[index];
 377                     self.pos_widget.loading_message(_t('Loading')+' '+(model.label || model.model || ''), progress);
 378                     var fields =  typeof model.fields === 'function'  ? model.fields(self,tmp)  : model.fields;
 379                     var domain =  typeof model.domain === 'function'  ? model.domain(self,tmp)  : model.domain;
 380                     var context = typeof model.context === 'function' ? model.context(self,tmp) : model.context;
 381                     var ids     = typeof model.ids === 'function'     ? model.ids(self,tmp) : model.ids;
 382                     progress += progress_step;
 383
 384
 385                     if( model.model ){
 386                         if (model.ids) {
 387                             var records = new instance.web.Model(model.model).call('read',[ids,fields],context);
 388                         } else {
 389                             var records = new instance.web.Model(model.model).query(fields).filter(domain).context(context).all()
 390                         }
 391                         records.then(function(result){
 392                                 try{    // catching exceptions in model.loaded(...)
 393                                     $.when(model.loaded(self,result,tmp))
 394                                         .then(function(){ load_model(index + 1); },
 395                                               function(err){ loaded.reject(err); });
 396                                 }catch(err){
 397                                     console.error(err.stack);
 398                                     loaded.reject(err);
 399                                 }
 400                             },function(err){
 401                                 loaded.reject(err);
 402                             });
 403                     }else if( model.loaded ){
 404                         try{    // catching exceptions in model.loaded(...)
 405                             $.when(model.loaded(self,tmp))
 406                                 .then(  function(){ load_model(index +1); },
 407                                         function(err){ loaded.reject(err); });
 408                         }catch(err){
 409                             loaded.reject(err);
 410                         }
 411                     }else{
 412                         load_model(index + 1);
 413                     }
 414                 }
 415             }
 416
 417             try{
 418                 load_model(0);
 419             }catch(err){
 420                 loaded.reject(err);
 421             }
 422
 423             return loaded;
 424         },
 425
 426         // reload the list of partner, returns as a deferred that resolves if there were
 427         // updated partners, and fails if not
 428         load_new_partners: function(){
 429             var self = this;
 430             var def  = new $.Deferred();
 431             var fields = _.find(this.models,function(model){ return model.model === 'res.partner'; }).fields;
 432             new instance.web.Model('res.partner')
 433                 .query(fields)
 434                 .filter([['write_date','>',this.db.get_partner_write_date()]])
 435                 .all({'timeout':3000, 'shadow': true})
 436                 .then(function(partners){
 437                     if (self.db.add_partners(partners)) {   // check if the partners we got were real updates
 438                         def.resolve();
 439                     } else {
 440                         def.reject();
 441                     }
 442                 }, function(){ def.reject(); });
 443             return def;
 444         },
 445
 446         // this is called when an order is removed from the order collection. It ensures that there is always an existing
 447         // order and a valid selected order
 448         on_removed_order: function(removed_order,index,reason){
 449             var order_list = this.get_order_list();
 450             if( (reason === 'abandon' || removed_order.temporary) && this.order_list.length > 0){
 451                 // when we intentionally remove an unfinished order, and there is another existing one
 452                 this.set_order(order_list[index] || order_list[order_list.length -1]);
 453             }else{
 454                 // when the order was automatically removed after completion,
 455                 // or when we intentionally delete the only concurrent order
 456                 this.add_new_order();
 457             }
 458         },
 459
 460         //creates a new empty order and sets it as the current order
 461         add_new_order: function(){
 462             var order = new module.Order({pos:this});
 463             this.get('orders').add(order);
 464             this.set('selectedOrder', order);
 465             return order;
 466         },
 467
 468         // return the current order
 469         get_order: function(){
 470             return this.get('selectedOrder');
 471         },
 472
 473         // change the current order
 474         set_order: function(order){
 475             this.set({ selectedOrder: order });
 476         },
 477
 478         // return the list of unpaid orders
 479         get_order_list: function(){
 480             return this.get('orders').models;
 481         },
 482
 483         //removes the current order
 484         delete_current_order: function(){
 485             this.get('selectedOrder').destroy({'reason':'abandon'});
 486         },
 487
 488         // saves the order locally and try to send it to the backend.
 489         // it returns a deferred that succeeds after having tried to send the order and all the other pending orders.
 490         push_order: function(order) {
 491             var self = this;
 492
 493             if(order){
 494                 this.proxy.log('push_order',order.export_as_JSON());
 495                 this.db.add_order(order.export_as_JSON());
 496             }
 497
 498             var pushed = new $.Deferred();
 499
 500             this.flush_mutex.exec(function(){
 501                 var flushed = self._flush_orders(self.db.get_orders());
 502
 503                 flushed.always(function(ids){
 504                     pushed.resolve();
 505                 });
 506             });
 507             return pushed;
 508         },
 509
 510         // saves the order locally and try to send it to the backend and make an invoice
 511         // returns a deferred that succeeds when the order has been posted and successfully generated
 512         // an invoice. This method can fail in various ways:
 513         // error-no-client: the order must have an associated partner_id. You can retry to make an invoice once
 514         //     this error is solved
 515         // error-transfer: there was a connection error during the transfer. You can retry to make the invoice once
 516         //     the network connection is up
 517
 518         push_and_invoice_order: function(order){
 519             var self = this;
 520             var invoiced = new $.Deferred();
 521
 522             if(!order.get_client()){
 523                 invoiced.reject('error-no-client');
 524                 return invoiced;
 525             }
 526
 527             var order_id = this.db.add_order(order.export_as_JSON());
 528
 529             this.flush_mutex.exec(function(){
 530                 var done = new $.Deferred(); // holds the mutex
 531
 532                 // send the order to the server
 533                 // we have a 30 seconds timeout on this push.
 534                 // FIXME: if the server takes more than 30 seconds to accept the order,
 535                 // the client will believe it wasn't successfully sent, and very bad
 536                 // things will happen as a duplicate will be sent next time
 537                 // so we must make sure the server detects and ignores duplicated orders
 538
 539                 var transfer = self._flush_orders([self.db.get_order(order_id)], {timeout:30000, to_invoice:true});
 540
 541                 transfer.fail(function(){
 542                     invoiced.reject('error-transfer');
 543                     done.reject();
 544                 });
 545
 546                 // on success, get the order id generated by the server
 547                 transfer.pipe(function(order_server_id){
 548
 549                     // generate the pdf and download it
 550                     self.pos_widget.do_action('point_of_sale.pos_invoice_report',{additional_context:{
 551                         active_ids:order_server_id,
 552                     }});
 553
 554                     invoiced.resolve();
 555                     done.resolve();
 556                 });
 557
 558                 return done;
 559
 560             });
 561
 562             return invoiced;
 563         },
 564
 565         // wrapper around the _save_to_server that updates the synch status widget
 566         _flush_orders: function(orders, options) {
 567             var self = this;
 568             this.set('synch',{ state: 'connecting', pending: orders.length});
 569
 570             return self._save_to_server(orders, options).done(function (server_ids) {
 571                 var pending = self.db.get_orders().length;
 572
 573                 self.set('synch', {
 574                     state: pending ? 'connecting' : 'connected',
 575                     pending: pending
 576                 });
 577
 578                 return server_ids;
 579             });
 580         },
 581
 582         // send an array of orders to the server
 583         // available options:
 584         // - timeout: timeout for the rpc call in ms
 585         // returns a deferred that resolves with the list of
 586         // server generated ids for the sent orders
 587         _save_to_server: function (orders, options) {
 588             if (!orders || !orders.length) {
 589                 var result = $.Deferred();
 590                 result.resolve([]);
 591                 return result;
 592             }
 593
 594             options = options || {};
 595
 596             var self = this;
 597             var timeout = typeof options.timeout === 'number' ? options.timeout : 7500 * orders.length;
 598
 599             // we try to send the order. shadow prevents a spinner if it takes too long. (unless we are sending an invoice,
 600             // then we want to notify the user that we are waiting on something )
 601             var posOrderModel = new instance.web.Model('pos.order');
 602             return posOrderModel.call('create_from_ui',
 603                 [_.map(orders, function (order) {
 604                     order.to_invoice = options.to_invoice || false;
 605                     return order;
 606                 })],
 607                 undefined,
 608                 {
 609                     shadow: !options.to_invoice,
 610                     timeout: timeout
 611                 }
 612             ).then(function (server_ids) {
 613                 _.each(orders, function (order) {
 614                     self.db.remove_order(order.id);
 615                 });
 616                 return server_ids;
 617             }).fail(function (error, event){
 618                 if(error.code === 200 ){    // Business Logic Error, not a connection problem
 619                     //if warning do not need to dispaly traceback!!
 620                     if(error.data.exception_type == 'warning'){
 621                         delete error.data.debug;
 622                     }
 623                     self.pos_widget.screen_selector.show_popup('error-traceback',{
 624                         message: error.data.message,
 625                         comment: error.data.debug
 626                     });
 627                 }
 628                 // prevent an error popup creation by the rpc failure
 629                 // we want the failure to be silent as we send the orders in the background
 630                 event.preventDefault();
 631                 console.error('Failed to send orders:', orders);
 632             });
 633         },
 634
 635         scan_product: function(parsed_code){
 636             var self = this;
 637             var selectedOrder = this.get_order();
 638             if(parsed_code.encoding === 'ean13'){
 639                 var product = this.db.get_product_by_ean13(parsed_code.base_code);
 640             }else if(parsed_code.encoding === 'reference'){
 641                 var product = this.db.get_product_by_reference(parsed_code.code);
 642             }
 643
 644             if(!product){
 645                 return false;
 646             }
 647
 648             if(parsed_code.type === 'price'){
 649                 selectedOrder.addProduct(product, {price:parsed_code.value});
 650             }else if(parsed_code.type === 'weight'){
 651                 selectedOrder.addProduct(product, {quantity:parsed_code.value, merge:false});
 652             }else if(parsed_code.type === 'discount'){
 653                 selectedOrder.addProduct(product, {discount:parsed_code.value, merge:false});
 654             }else{
 655                 selectedOrder.addProduct(product);
 656             }
 657             return true;
 658         },
 659     });
 660
 661     var orderline_id = 1;
 662
 663     // An orderline represent one element of the content of a client's shopping cart.
 664     // An orderline contains a product, its quantity, its price, discount. etc.
 665     // An Order contains zero or more Orderlines.
 666     module.Orderline = Backbone.Model.extend({
 667         initialize: function(attr,options){
 668             this.pos = options.pos;
 669             this.order = options.order;
 670             this.product = options.product;
 671             this.price   = options.product.price;
 672             this.quantity = 1;
 673             this.quantityStr = '1';
 674             this.discount = 0;
 675             this.discountStr = '0';
 676             this.type = 'unit';
 677             this.selected = false;
 678             this.id       = orderline_id++;
 679         },
 680         clone: function(){
 681             var orderline = new module.Orderline({},{
 682                 pos: this.pos,
 683                 order: null,
 684                 product: this.product,
 685                 price: this.price,
 686             });
 687             orderline.quantity = this.quantity;
 688             orderline.quantityStr = this.quantityStr;
 689             orderline.discount = this.discount;
 690             orderline.type = this.type;
 691             orderline.selected = false;
 692             return orderline;
 693         },
 694         // sets a discount [0,100]%
 695         set_discount: function(discount){
 696             var disc = Math.min(Math.max(parseFloat(discount) || 0, 0),100);
 697             this.discount = disc;
 698             this.discountStr = '' + disc;
 699             this.trigger('change',this);
 700         },
 701         // returns the discount [0,100]%
 702         get_discount: function(){
 703             return this.discount;
 704         },
 705         get_discount_str: function(){
 706             return this.discountStr;
 707         },
 708         get_product_type: function(){
 709             return this.type;
 710         },
 711         // sets the quantity of the product. The quantity will be rounded according to the
 712         // product's unity of measure properties. Quantities greater than zero will not get
 713         // rounded to zero
 714         set_quantity: function(quantity){
 715             if(quantity === 'remove'){
 716                 this.order.removeOrderline(this);
 717                 return;
 718             }else{
 719                 var quant = parseFloat(quantity) || 0;
 720                 var unit = this.get_unit();
 721                 if(unit){
 722                     if (unit.rounding) {
 723                         this.quantity    = round_pr(quant, unit.rounding);
 724                         this.quantityStr = this.quantity.toFixed(Math.ceil(Math.log(1.0 / unit.rounding) / Math.log(10)));
 725                     } else {
 726                         this.quantity    = round_pr(quant, 1);
 727                         this.quantityStr = this.quantity.toFixed(0);
 728                     }
 729                 }else{
 730                     this.quantity    = quant;
 731                     this.quantityStr = '' + this.quantity;
 732                 }
 733             }
 734             this.trigger('change',this);
 735         },
 736         // return the quantity of product
 737         get_quantity: function(){
 738             return this.quantity;
 739         },
 740         get_quantity_str: function(){
 741             return this.quantityStr;
 742         },
 743         get_quantity_str_with_unit: function(){
 744             var unit = this.get_unit();
 745             if(unit && !unit.is_unit){
 746                 return this.quantityStr + ' ' + unit.name;
 747             }else{
 748                 return this.quantityStr;
 749             }
 750         },
 751         // return the unit of measure of the product
 752         get_unit: function(){
 753             var unit_id = this.product.uom_id;
 754             if(!unit_id){
 755                 return undefined;
 756             }
 757             unit_id = unit_id[0];
 758             if(!this.pos){
 759                 return undefined;
 760             }
 761             return this.pos.units_by_id[unit_id];
 762         },
 763         // return the product of this orderline
 764         get_product: function(){
 765             return this.product;
 766         },
 767         // selects or deselects this orderline
 768         set_selected: function(selected){
 769             this.selected = selected;
 770             this.trigger('change',this);
 771         },
 772         // returns true if this orderline is selected
 773         is_selected: function(){
 774             return this.selected;
 775         },
 776         // when we add an new orderline we want to merge it with the last line to see reduce the number of items
 777         // in the orderline. This returns true if it makes sense to merge the two
 778         can_be_merged_with: function(orderline){
 779             if( this.get_product().id !== orderline.get_product().id){    //only orderline of the same product can be merged
 780                 return false;
 781             }else if(!this.get_unit() || !this.get_unit().groupable){
 782                 return false;
 783             }else if(this.get_product_type() !== orderline.get_product_type()){
 784                 return false;
 785             }else if(this.get_discount() > 0){             // we don't merge discounted orderlines
 786                 return false;
 787             }else if(this.price !== orderline.price){
 788                 return false;
 789             }else{
 790                 return true;
 791             }
 792         },
 793         merge: function(orderline){
 794             this.set_quantity(this.get_quantity() + orderline.get_quantity());
 795         },
 796         export_as_JSON: function() {
 797             return {
 798                 qty: this.get_quantity(),
 799                 price_unit: this.get_unit_price(),
 800                 discount: this.get_discount(),
 801                 product_id: this.get_product().id,
 802             };
 803         },
 804         //used to create a json of the ticket, to be sent to the printer
 805         export_for_printing: function(){
 806             return {
 807                 quantity:           this.get_quantity(),
 808                 unit_name:          this.get_unit().name,
 809                 price:              this.get_unit_price(),
 810                 discount:           this.get_discount(),
 811                 product_name:       this.get_product().display_name,
 812                 price_display :     this.get_display_price(),
 813                 price_with_tax :    this.get_price_with_tax(),
 814                 price_without_tax:  this.get_price_without_tax(),
 815                 tax:                this.get_tax(),
 816                 product_description:      this.get_product().description,
 817                 product_description_sale: this.get_product().description_sale,
 818             };
 819         },
 820         // changes the base price of the product for this orderline
 821         set_unit_price: function(price){
 822             this.price = round_di(parseFloat(price) || 0, this.pos.dp['Product Price']);
 823             this.trigger('change',this);
 824         },
 825         get_unit_price: function(){
 826             return this.price;
 827         },
 828         get_base_price:    function(){
 829             var rounding = this.pos.currency.rounding;
 830             return  round_pr(round_pr(this.get_unit_price() * this.get_quantity(),rounding) * (1- this.get_discount()/100.0),rounding);
 831         },
 832         get_display_price: function(){
 833             return this.get_base_price();
 834         },
 835         get_price_without_tax: function(){
 836             return this.get_all_prices().priceWithoutTax;
 837         },
 838         get_price_with_tax: function(){
 839             return this.get_all_prices().priceWithTax;
 840         },
 841         get_tax: function(){
 842             return this.get_all_prices().tax;
 843         },
 844         get_tax_details: function(){
 845             return this.get_all_prices().taxDetails;
 846         },
 847         get_all_prices: function(){
 848             var self = this;
 849             var currency_rounding = this.pos.currency.rounding;
 850             var base = this.get_base_price();
 851             var totalTax = base;
 852             var totalNoTax = base;
 853
 854             var product =  this.get_product();
 855             var taxes_ids = product.taxes_id;
 856             var taxes =  self.pos.taxes;
 857             var taxtotal = 0;
 858             var taxdetail = {};
 859             _.each(taxes_ids, function(el) {
 860                 var tax = _.detect(taxes, function(t) {return t.id === el;});
 861                 if (tax.price_include) {
 862                     var tmp;
 863                     if (tax.type === "percent") {
 864                         tmp =  base - round_pr(base / (1 + tax.amount),currency_rounding);
 865                     } else if (tax.type === "fixed") {
 866                         tmp = round_pr(tax.amount * self.get_quantity(),currency_rounding);
 867                     } else {
 868                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 869                     }
 870                     tmp = round_pr(tmp,currency_rounding);
 871                     taxtotal += tmp;
 872                     totalNoTax -= tmp;
 873                     taxdetail[tax.id] = tmp;
 874                 } else {
 875                     var tmp;
 876                     if (tax.type === "percent") {
 877                         tmp = tax.amount * base;
 878                     } else if (tax.type === "fixed") {
 879                         tmp = tax.amount * self.get_quantity();
 880                     } else {
 881                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 882                     }
 883                     tmp = round_pr(tmp,currency_rounding);
 884                     taxtotal += tmp;
 885                     totalTax += tmp;
 886                     taxdetail[tax.id] = tmp;
 887                 }
 888             });
 889             return {
 890                 "priceWithTax": totalTax,
 891                 "priceWithoutTax": totalNoTax,
 892                 "tax": taxtotal,
 893                 "taxDetails": taxdetail,
 894             };
 895         },
 896     });
 897
 898     module.OrderlineCollection = Backbone.Collection.extend({
 899         model: module.Orderline,
 900     });
 901
 902     // Every Paymentline contains a cashregister and an amount of money.
 903     module.Paymentline = Backbone.Model.extend({
 904         initialize: function(attributes, options) {
 905             this.amount = 0;
 906             this.cashregister = options.cashregister;
 907             this.name = this.cashregister.journal_id[1];
 908             this.selected = false;
 909             this.pos = options.pos;
 910         },
 911         //sets the amount of money on this payment line
 912         set_amount: function(value){
 913             this.amount = round_di(parseFloat(value) || 0, this.pos.currency.decimals);
 914             this.trigger('change:amount',this);
 915         },
 916         // returns the amount of money on this paymentline
 917         get_amount: function(){
 918             return this.amount;
 919         },
 920         get_amount_str: function(){
 921             return this.amount.toFixed(this.pos.currency.decimals);
 922         },
 923         set_selected: function(selected){
 924             if(this.selected !== selected){
 925                 this.selected = selected;
 926                 this.trigger('change:selected',this);
 927             }
 928         },
 929         // returns the associated cashregister
 930         //exports as JSON for server communication
 931         export_as_JSON: function(){
 932             return {
 933                 name: instance.web.datetime_to_str(new Date()),
 934                 statement_id: this.cashregister.id,
 935                 account_id: this.cashregister.account_id[0],
 936                 journal_id: this.cashregister.journal_id[0],
 937                 amount: this.get_amount()
 938             };
 939         },
 940         //exports as JSON for receipt printing
 941         export_for_printing: function(){
 942             return {
 943                 amount: this.get_amount(),
 944                 journal: this.cashregister.journal_id[1],
 945             };
 946         },
 947     });
 948
 949     module.PaymentlineCollection = Backbone.Collection.extend({
 950         model: module.Paymentline,
 951     });
 952
 953
 954     // An order more or less represents the content of a client's shopping cart (the OrderLines)
 955     // plus the associated payment information (the Paymentlines)
 956     // there is always an active ('selected') order in the Pos, a new one is created
 957     // automaticaly once an order is completed and sent to the server.
 958     module.Order = Backbone.Model.extend({
 959         initialize: function(attributes){
 960             Backbone.Model.prototype.initialize.apply(this, arguments);
 961             this.pos = attributes.pos;
 962             this.sequence_number = this.pos.pos_session.sequence_number++;
 963             this.uid =     this.generateUniqueId();
 964             this.set({
 965                 creationDate:   new Date(),
 966                 orderLines:     new module.OrderlineCollection(),
 967                 paymentLines:   new module.PaymentlineCollection(),
 968                 name:           _t("Order ") + this.uid,
 969                 client:         null,
 970             });
 971             this.selected_orderline   = undefined;
 972             this.selected_paymentline = undefined;
 973             this.screen_data = {};  // see ScreenSelector
 974             this.receipt_type = 'receipt';  // 'receipt' || 'invoice'
 975             this.temporary = attributes.temporary || false;
 976             this.to_invoice = false;
 977             return this;
 978         },
 979         is_empty: function(){
 980             return (this.get('orderLines').models.length === 0);
 981         },
 982         // Generates a public identification number for the order.
 983         // The generated number must be unique and sequential. They are made 12 digit long
 984         // to fit into EAN-13 barcodes, should it be needed
 985         generateUniqueId: function() {
 986             function zero_pad(num,size){
 987                 var s = ""+num;
 988                 while (s.length < size) {
 989                     s = "0" + s;
 990                 }
 991                 return s;
 992             }
 993             return zero_pad(this.pos.pos_session.id,5) +'-'+
 994                    zero_pad(this.pos.pos_session.login_number,3) +'-'+
 995                    zero_pad(this.sequence_number,4);
 996         },
 997         addOrderline: function(line){
 998             if(line.order){
 999                 order.removeOrderline(line);
1000             }
1001             line.order = this;
1002             this.get('orderLines').add(line);
1003             this.selectLine(this.getLastOrderline());
1004         },
1005         addProduct: function(product, options){
1006             options = options || {};
1007             var attr = JSON.parse(JSON.stringify(product));
1008             attr.pos = this.pos;
1009             attr.order = this;
1010             var line = new module.Orderline({}, {pos: this.pos, order: this, product: product});
1011
1012             if(options.quantity !== undefined){
1013                 line.set_quantity(options.quantity);
1014             }
1015             if(options.price !== undefined){
1016                 line.set_unit_price(options.price);
1017             }
1018             if(options.discount !== undefined){
1019                 line.set_discount(options.discount);
1020             }
1021
1022             var last_orderline = this.getLastOrderline();
1023             if( last_orderline && last_orderline.can_be_merged_with(line) && options.merge !== false){
1024                 last_orderline.merge(line);
1025             }else{
1026                 this.get('orderLines').add(line);
1027             }
1028             this.selectLine(this.getLastOrderline());
1029         },
1030         removeOrderline: function( line ){
1031             this.get('orderLines').remove(line);
1032             this.selectLine(this.getLastOrderline());
1033         },
1034         getOrderline: function(id){
1035             var orderlines = this.get('orderLines').models;
1036             for(var i = 0; i < orderlines.length; i++){
1037                 if(orderlines[i].id === id){
1038                     return orderlines[i];
1039                 }
1040             }
1041             return null;
1042         },
1043         getLastOrderline: function(){
1044             return this.get('orderLines').at(this.get('orderLines').length -1);
1045         },
1046         addPaymentline: function(cashregister) {
1047             var paymentLines = this.get('paymentLines');
1048             var newPaymentline = new module.Paymentline({},{cashregister:cashregister, pos:this.pos});
1049             if(cashregister.journal.type !== 'cash'){
1050                 newPaymentline.set_amount( Math.max(this.getDueLeft(),0) );
1051             }
1052             paymentLines.add(newPaymentline);
1053             this.selectPaymentline(newPaymentline);
1054
1055         },
1056         removePaymentline: function(line){
1057             if(this.selected_paymentline === line){
1058                 this.selectPaymentline(undefined);
1059             }
1060             this.get('paymentLines').remove(line);
1061         },
1062         getName: function() {
1063             return this.get('name');
1064         },
1065         getSubtotal : function(){
1066             return (this.get('orderLines')).reduce((function(sum, orderLine){
1067                 return sum + orderLine.get_display_price();
1068             }), 0);
1069         },
1070         getTotalTaxIncluded: function() {
1071             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1072                 return sum + orderLine.get_price_with_tax();
1073             }), 0);
1074         },
1075         getDiscountTotal: function() {
1076             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1077                 return sum + (orderLine.get_unit_price() * (orderLine.get_discount()/100) * orderLine.get_quantity());
1078             }), 0);
1079         },
1080         getTotalTaxExcluded: function() {
1081             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1082                 return sum + orderLine.get_price_without_tax();
1083             }), 0);
1084         },
1085         getTax: function() {
1086             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1087                 return sum + orderLine.get_tax();
1088             }), 0);
1089         },
1090         getTaxDetails: function(){
1091             var details = {};
1092             var fulldetails = [];
1093             var taxes_by_id = {};
1094
1095             for(var i = 0; i < this.pos.taxes.length; i++){
1096                 taxes_by_id[this.pos.taxes[i].id] = this.pos.taxes[i];
1097             }
1098
1099             this.get('orderLines').each(function(line){
1100                 var ldetails = line.get_tax_details();
1101                 for(var id in ldetails){
1102                     if(ldetails.hasOwnProperty(id)){
1103                         details[id] = (details[id] || 0) + ldetails[id];
1104                     }
1105                 }
1106             });
1107
1108             for(var id in details){
1109                 if(details.hasOwnProperty(id)){
1110                     fulldetails.push({amount: details[id], tax: taxes_by_id[id], name: taxes_by_id[id].name});
1111                 }
1112             }
1113
1114             return fulldetails;
1115         },
1116         getPaidTotal: function() {
1117             return (this.get('paymentLines')).reduce((function(sum, paymentLine) {
1118                 return sum + paymentLine.get_amount();
1119             }), 0);
1120         },
1121         getChange: function(paymentline) {
1122             if (!paymentline) {
1123                 var change = this.getPaidTotal() - this.getTotalTaxIncluded();
1124             } else {
1125                 var change = -this.getTotalTaxIncluded();
1126                 var lines  = this.get('paymentLines').models;
1127                 for (var i = 0; i < lines.length; i++) {
1128                     change += lines[i].get_amount();
1129                     if (lines[i] === paymentline) {
1130                         break;
1131                     }
1132                 }
1133             }
1134             return round_pr(Math.max(0,change), this.pos.currency.rounding);
1135         },
1136         getDueLeft: function(paymentline) {
1137             if (!paymentline) {
1138                 var due = this.getTotalTaxIncluded() - this.getPaidTotal();
1139             } else {
1140                 var due = this.getTotalTaxIncluded();
1141                 var lines = this.get('paymentLines').models;
1142                 for (var i = 0; i < lines.length; i++) {
1143                     if (lines[i] === paymentline) {
1144                         break;
1145                     } else {
1146                         due -= lines[i].get_amount();
1147                     }
1148                 }
1149             }
1150             return round_pr(Math.max(0,due), this.pos.currency.rounding);
1151         },
1152         isPaid: function(){
1153             return this.getDueLeft() === 0;
1154         },
1155         isPaidWithCash: function(){
1156             return !!this.get('paymentLines').find( function(pl){
1157                 return pl.cashregister.journal.type === 'cash';
1158             });
1159         },
1160         finalize: function(){
1161             this.destroy();
1162         },
1163         // sets the type of receipt 'receipt'(default) or 'invoice'
1164         set_receipt_type: function(type){
1165             this.receipt_type = type;
1166         },
1167         get_receipt_type: function(){
1168             return this.receipt_type;
1169         },
1170         // the client related to the current order.
1171         set_client: function(client){
1172             this.set('client',client);
1173         },
1174         get_client: function(){
1175             return this.get('client');
1176         },
1177         get_client_name: function(){
1178             var client = this.get('client');
1179             return client ? client.name : "";
1180         },
1181         // the order also stores the screen status, as the PoS supports
1182         // different active screens per order. This method is used to
1183         // store the screen status.
1184         set_screen_data: function(key,value){
1185             if(arguments.length === 2){
1186                 this.screen_data[key] = value;
1187             }else if(arguments.length === 1){
1188                 for(key in arguments[0]){
1189                     this.screen_data[key] = arguments[0][key];
1190                 }
1191             }
1192         },
1193         set_to_invoice: function(to_invoice) {
1194             this.to_invoice = to_invoice;
1195         },
1196         is_to_invoice: function(){
1197             return this.to_invoice;
1198         },
1199         // remove all the paymentlines with zero money in it
1200         clean_empty_paymentlines: function() {
1201             var lines = this.get('paymentLines').models;
1202             var empty = [];
1203             for ( var i = 0; i < lines.length; i++) {
1204                 if (!lines[i].get_amount()) {
1205                     empty.push(lines[i]);
1206                 }
1207             }
1208             for ( var i = 0; i < empty.length; i++) {
1209                 this.removePaymentline(empty[i]);
1210             }
1211         },
1212         //see set_screen_data
1213         get_screen_data: function(key){
1214             return this.screen_data[key];
1215         },
1216         // exports a JSON for receipt printing
1217         export_for_printing: function(){
1218             var orderlines = [];
1219             this.get('orderLines').each(function(orderline){
1220                 orderlines.push(orderline.export_for_printing());
1221             });
1222
1223             var paymentlines = [];
1224             this.get('paymentLines').each(function(paymentline){
1225                 paymentlines.push(paymentline.export_for_printing());
1226             });
1227             var client  = this.get('client');
1228             var cashier = this.pos.cashier || this.pos.user;
1229             var company = this.pos.company;
1230             var shop    = this.pos.shop;
1231             var date = new Date();
1232
1233             return {
1234                 orderlines: orderlines,
1235                 paymentlines: paymentlines,
1236                 subtotal: this.getSubtotal(),
1237                 total_with_tax: this.getTotalTaxIncluded(),
1238                 total_without_tax: this.getTotalTaxExcluded(),
1239                 total_tax: this.getTax(),
1240                 total_paid: this.getPaidTotal(),
1241                 total_discount: this.getDiscountTotal(),
1242                 tax_details: this.getTaxDetails(),
1243                 change: this.getChange(),
1244                 name : this.getName(),
1245                 client: client ? client.name : null ,
1246                 invoice_id: null,   //TODO
1247                 cashier: cashier ? cashier.name : null,
1248                 header: this.pos.config.receipt_header || '',
1249                 footer: this.pos.config.receipt_footer || '',
1250                 precision: {
1251                     price: 2,
1252                     money: 2,
1253                     quantity: 3,
1254                 },
1255                 date: {
1256                     year: date.getFullYear(),
1257                     month: date.getMonth(),
1258                     date: date.getDate(),       // day of the month
1259                     day: date.getDay(),         // day of the week
1260                     hour: date.getHours(),
1261                     minute: date.getMinutes() ,
1262                     isostring: date.toISOString(),
1263                     localestring: date.toLocaleString(),
1264                 },
1265                 company:{
1266                     email: company.email,
1267                     website: company.website,
1268                     company_registry: company.company_registry,
1269                     contact_address: company.partner_id[1],
1270                     vat: company.vat,
1271                     name: company.name,
1272                     phone: company.phone,
1273                     logo:  this.pos.company_logo_base64,
1274                 },
1275                 shop:{
1276                     name: shop.name,
1277                 },
1278                 currency: this.pos.currency,
1279             };
1280         },
1281         export_as_JSON: function() {
1282             var orderLines, paymentLines;
1283             orderLines = [];
1284             (this.get('orderLines')).each(_.bind( function(item) {
1285                 return orderLines.push([0, 0, item.export_as_JSON()]);
1286             }, this));
1287             paymentLines = [];
1288             (this.get('paymentLines')).each(_.bind( function(item) {
1289                 return paymentLines.push([0, 0, item.export_as_JSON()]);
1290             }, this));
1291             return {
1292                 name: this.getName(),
1293                 amount_paid: this.getPaidTotal(),
1294                 amount_total: this.getTotalTaxIncluded(),
1295                 amount_tax: this.getTax(),
1296                 amount_return: this.getChange(),
1297                 lines: orderLines,
1298                 statement_ids: paymentLines,
1299                 pos_session_id: this.pos.pos_session.id,
1300                 partner_id: this.get_client() ? this.get_client().id : false,
1301                 user_id: this.pos.cashier ? this.pos.cashier.id : this.pos.user.id,
1302                 uid: this.uid,
1303                 sequence_number: this.sequence_number,
1304             };
1305         },
1306         getSelectedLine: function(){
1307             return this.selected_orderline;
1308         },
1309         selectLine: function(line){
1310             if(line){
1311                 if(line !== this.selected_orderline){
1312                     if(this.selected_orderline){
1313                         this.selected_orderline.set_selected(false);
1314                     }
1315                     this.selected_orderline = line;
1316                     this.selected_orderline.set_selected(true);
1317                 }
1318             }else{
1319                 this.selected_orderline = undefined;
1320             }
1321         },
1322         deselectLine: function(){
1323             if(this.selected_orderline){
1324                 this.selected_orderline.set_selected(false);
1325                 this.selected_orderline = undefined;
1326             }
1327         },
1328         selectPaymentline: function(line){
1329             if(line !== this.selected_paymentline){
1330                 if(this.selected_paymentline){
1331                     this.selected_paymentline.set_selected(false);
1332                 }
1333                 this.selected_paymentline = line;
1334                 if(this.selected_paymentline){
1335                     this.selected_paymentline.set_selected(true);
1336                 }
1337                 this.trigger('change:selected_paymentline',this.selected_paymentline);
1338             }
1339         },
1340     });
1341
1342     module.OrderCollection = Backbone.Collection.extend({
1343         model: module.Order,
1344     });
1345
1346     /*
1347      The numpad handles both the choice of the property currently being modified
1348      (quantity, price or discount) and the edition of the corresponding numeric value.
1349      */
1350     module.NumpadState = Backbone.Model.extend({
1351         defaults: {
1352             buffer: "0",
1353             mode: "quantity"
1354         },
1355         appendNewChar: function(newChar) {
1356             var oldBuffer;
1357             oldBuffer = this.get('buffer');
1358             if (oldBuffer === '0') {
1359                 this.set({
1360                     buffer: newChar
1361                 });
1362             } else if (oldBuffer === '-0') {
1363                 this.set({
1364                     buffer: "-" + newChar
1365                 });
1366             } else {
1367                 this.set({
1368                     buffer: (this.get('buffer')) + newChar
1369                 });
1370             }
1371             this.trigger('set_value',this.get('buffer'));
1372         },
1373         deleteLastChar: function() {
1374             if(this.get('buffer') === ""){
1375                 if(this.get('mode') === 'quantity'){
1376                     this.trigger('set_value','remove');
1377                 }else{
1378                     this.trigger('set_value',this.get('buffer'));
1379                 }
1380             }else{
1381                 var newBuffer = this.get('buffer').slice(0,-1) || "";
1382                 this.set({ buffer: newBuffer });
1383                 this.trigger('set_value',this.get('buffer'));
1384             }
1385         },
1386         switchSign: function() {
1387             var oldBuffer;
1388             oldBuffer = this.get('buffer');
1389             this.set({
1390                 buffer: oldBuffer[0] === '-' ? oldBuffer.substr(1) : "-" + oldBuffer
1391             });
1392             this.trigger('set_value',this.get('buffer'));
1393         },
1394         changeMode: function(newMode) {
1395             this.set({
1396                 buffer: "0",
1397                 mode: newMode
1398             });
1399         },
1400         reset: function() {
1401             this.set({
1402                 buffer: "0",
1403                 mode: "quantity"
1404             });
1405         },
1406         resetValue: function(){
1407             this.set({buffer:'0'});
1408         },
1409     });
1410 }