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) && 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             var order = this.get_order();
 486             if (order) {
 487                 order.destroy({'reason':'abandon'});
 488             }
 489         },
 490
 491         // saves the order locally and try to send it to the backend.
 492         // it returns a deferred that succeeds after having tried to send the order and all the other pending orders.
 493         push_order: function(order) {
 494             var self = this;
 495
 496             if(order){
 497                 this.proxy.log('push_order',order.export_as_JSON());
 498                 this.db.add_order(order.export_as_JSON());
 499             }
 500
 501             var pushed = new $.Deferred();
 502
 503             this.flush_mutex.exec(function(){
 504                 var flushed = self._flush_orders(self.db.get_orders());
 505
 506                 flushed.always(function(ids){
 507                     pushed.resolve();
 508                 });
 509             });
 510             return pushed;
 511         },
 512
 513         // saves the order locally and try to send it to the backend and make an invoice
 514         // returns a deferred that succeeds when the order has been posted and successfully generated
 515         // an invoice. This method can fail in various ways:
 516         // error-no-client: the order must have an associated partner_id. You can retry to make an invoice once
 517         //     this error is solved
 518         // error-transfer: there was a connection error during the transfer. You can retry to make the invoice once
 519         //     the network connection is up
 520
 521         push_and_invoice_order: function(order){
 522             var self = this;
 523             var invoiced = new $.Deferred();
 524
 525             if(!order.get_client()){
 526                 invoiced.reject('error-no-client');
 527                 return invoiced;
 528             }
 529
 530             var order_id = this.db.add_order(order.export_as_JSON());
 531
 532             this.flush_mutex.exec(function(){
 533                 var done = new $.Deferred(); // holds the mutex
 534
 535                 // send the order to the server
 536                 // we have a 30 seconds timeout on this push.
 537                 // FIXME: if the server takes more than 30 seconds to accept the order,
 538                 // the client will believe it wasn't successfully sent, and very bad
 539                 // things will happen as a duplicate will be sent next time
 540                 // so we must make sure the server detects and ignores duplicated orders
 541
 542                 var transfer = self._flush_orders([self.db.get_order(order_id)], {timeout:30000, to_invoice:true});
 543
 544                 transfer.fail(function(){
 545                     invoiced.reject('error-transfer');
 546                     done.reject();
 547                 });
 548
 549                 // on success, get the order id generated by the server
 550                 transfer.pipe(function(order_server_id){
 551
 552                     // generate the pdf and download it
 553                     self.pos_widget.do_action('point_of_sale.pos_invoice_report',{additional_context:{
 554                         active_ids:order_server_id,
 555                     }});
 556
 557                     invoiced.resolve();
 558                     done.resolve();
 559                 });
 560
 561                 return done;
 562
 563             });
 564
 565             return invoiced;
 566         },
 567
 568         // wrapper around the _save_to_server that updates the synch status widget
 569         _flush_orders: function(orders, options) {
 570             var self = this;
 571             this.set('synch',{ state: 'connecting', pending: orders.length});
 572
 573             return self._save_to_server(orders, options).done(function (server_ids) {
 574                 var pending = self.db.get_orders().length;
 575
 576                 self.set('synch', {
 577                     state: pending ? 'connecting' : 'connected',
 578                     pending: pending
 579                 });
 580
 581                 return server_ids;
 582             });
 583         },
 584
 585         // send an array of orders to the server
 586         // available options:
 587         // - timeout: timeout for the rpc call in ms
 588         // returns a deferred that resolves with the list of
 589         // server generated ids for the sent orders
 590         _save_to_server: function (orders, options) {
 591             if (!orders || !orders.length) {
 592                 var result = $.Deferred();
 593                 result.resolve([]);
 594                 return result;
 595             }
 596
 597             options = options || {};
 598
 599             var self = this;
 600             var timeout = typeof options.timeout === 'number' ? options.timeout : 7500 * orders.length;
 601
 602             // we try to send the order. shadow prevents a spinner if it takes too long. (unless we are sending an invoice,
 603             // then we want to notify the user that we are waiting on something )
 604             var posOrderModel = new instance.web.Model('pos.order');
 605             return posOrderModel.call('create_from_ui',
 606                 [_.map(orders, function (order) {
 607                     order.to_invoice = options.to_invoice || false;
 608                     return order;
 609                 })],
 610                 undefined,
 611                 {
 612                     shadow: !options.to_invoice,
 613                     timeout: timeout
 614                 }
 615             ).then(function (server_ids) {
 616                 _.each(orders, function (order) {
 617                     self.db.remove_order(order.id);
 618                 });
 619                 return server_ids;
 620             }).fail(function (error, event){
 621                 if(error.code === 200 ){    // Business Logic Error, not a connection problem
 622                     //if warning do not need to display traceback!!
 623                     if (error.data.exception_type == 'warning') {
 624                         delete error.data.debug;
 625                     }
 626                     self.pos_widget.screen_selector.show_popup('error-traceback',{
 627                         message: error.data.message,
 628                         comment: error.data.debug
 629                     });
 630                 }
 631                 // prevent an error popup creation by the rpc failure
 632                 // we want the failure to be silent as we send the orders in the background
 633                 event.preventDefault();
 634                 console.error('Failed to send orders:', orders);
 635             });
 636         },
 637
 638         scan_product: function(parsed_code){
 639             var self = this;
 640             var selectedOrder = this.get_order();
 641             if(parsed_code.encoding === 'ean13'){
 642                 var product = this.db.get_product_by_ean13(parsed_code.base_code);
 643             }else if(parsed_code.encoding === 'reference'){
 644                 var product = this.db.get_product_by_reference(parsed_code.code);
 645             }
 646
 647             if(!product){
 648                 return false;
 649             }
 650
 651             if(parsed_code.type === 'price'){
 652                 selectedOrder.addProduct(product, {price:parsed_code.value});
 653             }else if(parsed_code.type === 'weight'){
 654                 selectedOrder.addProduct(product, {quantity:parsed_code.value, merge:false});
 655             }else if(parsed_code.type === 'discount'){
 656                 selectedOrder.addProduct(product, {discount:parsed_code.value, merge:false});
 657             }else{
 658                 selectedOrder.addProduct(product);
 659             }
 660             return true;
 661         },
 662     });
 663
 664     var orderline_id = 1;
 665
 666     // An orderline represent one element of the content of a client's shopping cart.
 667     // An orderline contains a product, its quantity, its price, discount. etc.
 668     // An Order contains zero or more Orderlines.
 669     module.Orderline = Backbone.Model.extend({
 670         initialize: function(attr,options){
 671             this.pos = options.pos;
 672             this.order = options.order;
 673             this.product = options.product;
 674             this.price   = options.product.price;
 675             this.quantity = 1;
 676             this.quantityStr = '1';
 677             this.discount = 0;
 678             this.discountStr = '0';
 679             this.type = 'unit';
 680             this.selected = false;
 681             this.id       = orderline_id++;
 682         },
 683         clone: function(){
 684             var orderline = new module.Orderline({},{
 685                 pos: this.pos,
 686                 order: null,
 687                 product: this.product,
 688                 price: this.price,
 689             });
 690             orderline.quantity = this.quantity;
 691             orderline.quantityStr = this.quantityStr;
 692             orderline.discount = this.discount;
 693             orderline.type = this.type;
 694             orderline.selected = false;
 695             return orderline;
 696         },
 697         // sets a discount [0,100]%
 698         set_discount: function(discount){
 699             var disc = Math.min(Math.max(parseFloat(discount) || 0, 0),100);
 700             this.discount = disc;
 701             this.discountStr = '' + disc;
 702             this.trigger('change',this);
 703         },
 704         // returns the discount [0,100]%
 705         get_discount: function(){
 706             return this.discount;
 707         },
 708         get_discount_str: function(){
 709             return this.discountStr;
 710         },
 711         get_product_type: function(){
 712             return this.type;
 713         },
 714         // sets the quantity of the product. The quantity will be rounded according to the
 715         // product's unity of measure properties. Quantities greater than zero will not get
 716         // rounded to zero
 717         set_quantity: function(quantity){
 718             if(quantity === 'remove'){
 719                 this.order.removeOrderline(this);
 720                 return;
 721             }else{
 722                 var quant = parseFloat(quantity) || 0;
 723                 var unit = this.get_unit();
 724                 if(unit){
 725                     if (unit.rounding) {
 726                         this.quantity    = round_pr(quant, unit.rounding);
 727                         this.quantityStr = this.quantity.toFixed(Math.ceil(Math.log(1.0 / unit.rounding) / Math.log(10)));
 728                     } else {
 729                         this.quantity    = round_pr(quant, 1);
 730                         this.quantityStr = this.quantity.toFixed(0);
 731                     }
 732                 }else{
 733                     this.quantity    = quant;
 734                     this.quantityStr = '' + this.quantity;
 735                 }
 736             }
 737             this.trigger('change',this);
 738         },
 739         // return the quantity of product
 740         get_quantity: function(){
 741             return this.quantity;
 742         },
 743         get_quantity_str: function(){
 744             return this.quantityStr;
 745         },
 746         get_quantity_str_with_unit: function(){
 747             var unit = this.get_unit();
 748             if(unit && !unit.is_unit){
 749                 return this.quantityStr + ' ' + unit.name;
 750             }else{
 751                 return this.quantityStr;
 752             }
 753         },
 754         // return the unit of measure of the product
 755         get_unit: function(){
 756             var unit_id = this.product.uom_id;
 757             if(!unit_id){
 758                 return undefined;
 759             }
 760             unit_id = unit_id[0];
 761             if(!this.pos){
 762                 return undefined;
 763             }
 764             return this.pos.units_by_id[unit_id];
 765         },
 766         // return the product of this orderline
 767         get_product: function(){
 768             return this.product;
 769         },
 770         // selects or deselects this orderline
 771         set_selected: function(selected){
 772             this.selected = selected;
 773             this.trigger('change',this);
 774         },
 775         // returns true if this orderline is selected
 776         is_selected: function(){
 777             return this.selected;
 778         },
 779         // when we add an new orderline we want to merge it with the last line to see reduce the number of items
 780         // in the orderline. This returns true if it makes sense to merge the two
 781         can_be_merged_with: function(orderline){
 782             if( this.get_product().id !== orderline.get_product().id){    //only orderline of the same product can be merged
 783                 return false;
 784             }else if(!this.get_unit() || !this.get_unit().groupable){
 785                 return false;
 786             }else if(this.get_product_type() !== orderline.get_product_type()){
 787                 return false;
 788             }else if(this.get_discount() > 0){             // we don't merge discounted orderlines
 789                 return false;
 790             }else if(this.price !== orderline.price){
 791                 return false;
 792             }else{
 793                 return true;
 794             }
 795         },
 796         merge: function(orderline){
 797             this.set_quantity(this.get_quantity() + orderline.get_quantity());
 798         },
 799         export_as_JSON: function() {
 800             return {
 801                 qty: this.get_quantity(),
 802                 price_unit: this.get_unit_price(),
 803                 discount: this.get_discount(),
 804                 product_id: this.get_product().id,
 805             };
 806         },
 807         //used to create a json of the ticket, to be sent to the printer
 808         export_for_printing: function(){
 809             return {
 810                 quantity:           this.get_quantity(),
 811                 unit_name:          this.get_unit().name,
 812                 price:              this.get_unit_price(),
 813                 discount:           this.get_discount(),
 814                 product_name:       this.get_product().display_name,
 815                 price_display :     this.get_display_price(),
 816                 price_with_tax :    this.get_price_with_tax(),
 817                 price_without_tax:  this.get_price_without_tax(),
 818                 tax:                this.get_tax(),
 819                 product_description:      this.get_product().description,
 820                 product_description_sale: this.get_product().description_sale,
 821             };
 822         },
 823         // changes the base price of the product for this orderline
 824         set_unit_price: function(price){
 825             this.price = round_di(parseFloat(price) || 0, this.pos.dp['Product Price']);
 826             this.trigger('change',this);
 827         },
 828         get_unit_price: function(){
 829             return this.price;
 830         },
 831         get_base_price:    function(){
 832             var rounding = this.pos.currency.rounding;
 833             return  round_pr(round_pr(this.get_unit_price() * this.get_quantity(),rounding) * (1- this.get_discount()/100.0),rounding);
 834         },
 835         get_display_price: function(){
 836             return this.get_base_price();
 837         },
 838         get_price_without_tax: function(){
 839             return this.get_all_prices().priceWithoutTax;
 840         },
 841         get_price_with_tax: function(){
 842             return this.get_all_prices().priceWithTax;
 843         },
 844         get_tax: function(){
 845             return this.get_all_prices().tax;
 846         },
 847         get_tax_details: function(){
 848             return this.get_all_prices().taxDetails;
 849         },
 850         get_all_prices: function(){
 851             var self = this;
 852             var currency_rounding = this.pos.currency.rounding;
 853             var base = this.get_base_price();
 854             var totalTax = base;
 855             var totalNoTax = base;
 856
 857             var product =  this.get_product();
 858             var taxes_ids = product.taxes_id;
 859             var taxes =  self.pos.taxes;
 860             var taxtotal = 0;
 861             var taxdetail = {};
 862             _.each(taxes_ids, function(el) {
 863                 var tax = _.detect(taxes, function(t) {return t.id === el;});
 864                 if (tax.price_include) {
 865                     var tmp;
 866                     if (tax.type === "percent") {
 867                         tmp =  base - round_pr(base / (1 + tax.amount),currency_rounding);
 868                     } else if (tax.type === "fixed") {
 869                         tmp = round_pr(tax.amount * self.get_quantity(),currency_rounding);
 870                     } else {
 871                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 872                     }
 873                     tmp = round_pr(tmp,currency_rounding);
 874                     taxtotal += tmp;
 875                     totalNoTax -= tmp;
 876                     taxdetail[tax.id] = tmp;
 877                 } else {
 878                     var tmp;
 879                     if (tax.type === "percent") {
 880                         tmp = tax.amount * base;
 881                     } else if (tax.type === "fixed") {
 882                         tmp = tax.amount * self.get_quantity();
 883                     } else {
 884                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 885                     }
 886                     tmp = round_pr(tmp,currency_rounding);
 887                     taxtotal += tmp;
 888                     totalTax += tmp;
 889                     taxdetail[tax.id] = tmp;
 890                 }
 891             });
 892             return {
 893                 "priceWithTax": totalTax,
 894                 "priceWithoutTax": totalNoTax,
 895                 "tax": taxtotal,
 896                 "taxDetails": taxdetail,
 897             };
 898         },
 899     });
 900
 901     module.OrderlineCollection = Backbone.Collection.extend({
 902         model: module.Orderline,
 903     });
 904
 905     // Every Paymentline contains a cashregister and an amount of money.
 906     module.Paymentline = Backbone.Model.extend({
 907         initialize: function(attributes, options) {
 908             this.amount = 0;
 909             this.cashregister = options.cashregister;
 910             this.name = this.cashregister.journal_id[1];
 911             this.selected = false;
 912             this.pos = options.pos;
 913         },
 914         //sets the amount of money on this payment line
 915         set_amount: function(value){
 916             this.amount = round_di(parseFloat(value) || 0, this.pos.currency.decimals);
 917             this.trigger('change:amount',this);
 918         },
 919         // returns the amount of money on this paymentline
 920         get_amount: function(){
 921             return this.amount;
 922         },
 923         get_amount_str: function(){
 924             return this.amount.toFixed(this.pos.currency.decimals);
 925         },
 926         set_selected: function(selected){
 927             if(this.selected !== selected){
 928                 this.selected = selected;
 929                 this.trigger('change:selected',this);
 930             }
 931         },
 932         // returns the associated cashregister
 933         //exports as JSON for server communication
 934         export_as_JSON: function(){
 935             return {
 936                 name: instance.web.datetime_to_str(new Date()),
 937                 statement_id: this.cashregister.id,
 938                 account_id: this.cashregister.account_id[0],
 939                 journal_id: this.cashregister.journal_id[0],
 940                 amount: this.get_amount()
 941             };
 942         },
 943         //exports as JSON for receipt printing
 944         export_for_printing: function(){
 945             return {
 946                 amount: this.get_amount(),
 947                 journal: this.cashregister.journal_id[1],
 948             };
 949         },
 950     });
 951
 952     module.PaymentlineCollection = Backbone.Collection.extend({
 953         model: module.Paymentline,
 954     });
 955
 956
 957     // An order more or less represents the content of a client's shopping cart (the OrderLines)
 958     // plus the associated payment information (the Paymentlines)
 959     // there is always an active ('selected') order in the Pos, a new one is created
 960     // automaticaly once an order is completed and sent to the server.
 961     module.Order = Backbone.Model.extend({
 962         initialize: function(attributes){
 963             Backbone.Model.prototype.initialize.apply(this, arguments);
 964             this.pos = attributes.pos;
 965             this.sequence_number = this.pos.pos_session.sequence_number++;
 966             this.uid =     this.generateUniqueId();
 967             this.set({
 968                 creationDate:   new Date(),
 969                 orderLines:     new module.OrderlineCollection(),
 970                 paymentLines:   new module.PaymentlineCollection(),
 971                 name:           _t("Order ") + this.uid,
 972                 client:         null,
 973             });
 974             this.selected_orderline   = undefined;
 975             this.selected_paymentline = undefined;
 976             this.screen_data = {};  // see ScreenSelector
 977             this.temporary = attributes.temporary || false;
 978             this.to_invoice = false;
 979             return this;
 980         },
 981         is_empty: function(){
 982             return (this.get('orderLines').models.length === 0);
 983         },
 984
 985         // Generates a public identification number for the order.
 986         // The generated number must be unique and sequential. They are made 12 digit long
 987         // to fit into EAN-13 barcodes, should it be needed
 988         generateUniqueId: function() {
 989             function zero_pad(num,size){
 990                 var s = ""+num;
 991                 while (s.length < size) {
 992                     s = "0" + s;
 993                 }
 994                 return s;
 995             }
 996             return zero_pad(this.pos.pos_session.id,5) +'-'+
 997                    zero_pad(this.pos.pos_session.login_number,3) +'-'+
 998                    zero_pad(this.sequence_number,4);
 999         },
1000         addOrderline: function(line){
1001             if(line.order){
1002                 order.removeOrderline(line);
1003             }
1004             line.order = this;
1005             this.get('orderLines').add(line);
1006             this.selectLine(this.getLastOrderline());
1007         },
1008         addProduct: function(product, options){
1009             options = options || {};
1010             var attr = JSON.parse(JSON.stringify(product));
1011             attr.pos = this.pos;
1012             attr.order = this;
1013             var line = new module.Orderline({}, {pos: this.pos, order: this, product: product});
1014
1015             if(options.quantity !== undefined){
1016                 line.set_quantity(options.quantity);
1017             }
1018             if(options.price !== undefined){
1019                 line.set_unit_price(options.price);
1020             }
1021             if(options.discount !== undefined){
1022                 line.set_discount(options.discount);
1023             }
1024
1025             var last_orderline = this.getLastOrderline();
1026             if( last_orderline && last_orderline.can_be_merged_with(line) && options.merge !== false){
1027                 last_orderline.merge(line);
1028             }else{
1029                 this.get('orderLines').add(line);
1030             }
1031             this.selectLine(this.getLastOrderline());
1032         },
1033         removeOrderline: function( line ){
1034             this.get('orderLines').remove(line);
1035             this.selectLine(this.getLastOrderline());
1036         },
1037         getOrderline: function(id){
1038             var orderlines = this.get('orderLines').models;
1039             for(var i = 0; i < orderlines.length; i++){
1040                 if(orderlines[i].id === id){
1041                     return orderlines[i];
1042                 }
1043             }
1044             return null;
1045         },
1046         getLastOrderline: function(){
1047             return this.get('orderLines').at(this.get('orderLines').length -1);
1048         },
1049         addPaymentline: function(cashregister) {
1050             var paymentLines = this.get('paymentLines');
1051             var newPaymentline = new module.Paymentline({},{cashregister:cashregister, pos:this.pos});
1052             if(cashregister.journal.type !== 'cash'){
1053                 newPaymentline.set_amount( Math.max(this.getDueLeft(),0) );
1054             }
1055             paymentLines.add(newPaymentline);
1056             this.selectPaymentline(newPaymentline);
1057
1058         },
1059         removePaymentline: function(line){
1060             if(this.selected_paymentline === line){
1061                 this.selectPaymentline(undefined);
1062             }
1063             this.get('paymentLines').remove(line);
1064         },
1065         getName: function() {
1066             return this.get('name');
1067         },
1068         getSubtotal : function(){
1069             return (this.get('orderLines')).reduce((function(sum, orderLine){
1070                 return sum + orderLine.get_display_price();
1071             }), 0);
1072         },
1073         getTotalTaxIncluded: function() {
1074             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1075                 return sum + orderLine.get_price_with_tax();
1076             }), 0);
1077         },
1078         getDiscountTotal: function() {
1079             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1080                 return sum + (orderLine.get_unit_price() * (orderLine.get_discount()/100) * orderLine.get_quantity());
1081             }), 0);
1082         },
1083         getTotalTaxExcluded: function() {
1084             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1085                 return sum + orderLine.get_price_without_tax();
1086             }), 0);
1087         },
1088         getTax: function() {
1089             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1090                 return sum + orderLine.get_tax();
1091             }), 0);
1092         },
1093         getTaxDetails: function(){
1094             var details = {};
1095             var fulldetails = [];
1096             var taxes_by_id = {};
1097
1098             for(var i = 0; i < this.pos.taxes.length; i++){
1099                 taxes_by_id[this.pos.taxes[i].id] = this.pos.taxes[i];
1100             }
1101
1102             this.get('orderLines').each(function(line){
1103                 var ldetails = line.get_tax_details();
1104                 for(var id in ldetails){
1105                     if(ldetails.hasOwnProperty(id)){
1106                         details[id] = (details[id] || 0) + ldetails[id];
1107                     }
1108                 }
1109             });
1110
1111             for(var id in details){
1112                 if(details.hasOwnProperty(id)){
1113                     fulldetails.push({amount: details[id], tax: taxes_by_id[id], name: taxes_by_id[id].name});
1114                 }
1115             }
1116
1117             return fulldetails;
1118         },
1119         getPaidTotal: function() {
1120             return (this.get('paymentLines')).reduce((function(sum, paymentLine) {
1121                 return sum + paymentLine.get_amount();
1122             }), 0);
1123         },
1124         getChange: function(paymentline) {
1125             if (!paymentline) {
1126                 var change = this.getPaidTotal() - this.getTotalTaxIncluded();
1127             } else {
1128                 var change = -this.getTotalTaxIncluded();
1129                 var lines  = this.get('paymentLines').models;
1130                 for (var i = 0; i < lines.length; i++) {
1131                     change += lines[i].get_amount();
1132                     if (lines[i] === paymentline) {
1133                         break;
1134                     }
1135                 }
1136             }
1137             return round_pr(Math.max(0,change), this.pos.currency.rounding);
1138         },
1139         getDueLeft: function(paymentline) {
1140             if (!paymentline) {
1141                 var due = this.getTotalTaxIncluded() - this.getPaidTotal();
1142             } else {
1143                 var due = this.getTotalTaxIncluded();
1144                 var lines = this.get('paymentLines').models;
1145                 for (var i = 0; i < lines.length; i++) {
1146                     if (lines[i] === paymentline) {
1147                         break;
1148                     } else {
1149                         due -= lines[i].get_amount();
1150                     }
1151                 }
1152             }
1153             return round_pr(Math.max(0,due), this.pos.currency.rounding);
1154         },
1155         isPaid: function(){
1156             return this.getDueLeft() === 0;
1157         },
1158         isPaidWithCash: function(){
1159             return !!this.get('paymentLines').find( function(pl){
1160                 return pl.cashregister.journal.type === 'cash';
1161             });
1162         },
1163         finalize: function(){
1164             this.destroy();
1165         },
1166         set_to_invoice: function(to_invoice) {
1167             this.to_invoice = to_invoice;
1168         },
1169         is_to_invoice: function(){
1170             return this.to_invoice;
1171         },
1172         // remove all the paymentlines with zero money in it
1173         clean_empty_paymentlines: function() {
1174             var lines = this.get('paymentLines').models;
1175             var empty = [];
1176             for ( var i = 0; i < lines.length; i++) {
1177                 if (!lines[i].get_amount()) {
1178                     empty.push(lines[i]);
1179                 }
1180             }
1181             for ( var i = 0; i < empty.length; i++) {
1182                 this.removePaymentline(empty[i]);
1183             }
1184         },
1185         // the client related to the current order.
1186         set_client: function(client){
1187             this.set('client',client);
1188         },
1189         get_client: function(){
1190             return this.get('client');
1191         },
1192         get_client_name: function(){
1193             var client = this.get('client');
1194             return client ? client.name : "";
1195         },
1196         // the order also stores the screen status, as the PoS supports
1197         // different active screens per order. This method is used to
1198         // store the screen status.
1199         set_screen_data: function(key,value){
1200             if(arguments.length === 2){
1201                 this.screen_data[key] = value;
1202             }else if(arguments.length === 1){
1203                 for(key in arguments[0]){
1204                     this.screen_data[key] = arguments[0][key];
1205                 }
1206             }
1207         },
1208         set_to_invoice: function(to_invoice) {
1209             this.to_invoice = to_invoice;
1210         },
1211         is_to_invoice: function(){
1212             return this.to_invoice;
1213         },
1214         // remove all the paymentlines with zero money in it
1215         clean_empty_paymentlines: function() {
1216             var lines = this.get('paymentLines').models;
1217             var empty = [];
1218             for ( var i = 0; i < lines.length; i++) {
1219                 if (!lines[i].get_amount()) {
1220                     empty.push(lines[i]);
1221                 }
1222             }
1223             for ( var i = 0; i < empty.length; i++) {
1224                 this.removePaymentline(empty[i]);
1225             }
1226         },
1227         //see set_screen_data
1228         get_screen_data: function(key){
1229             return this.screen_data[key];
1230         },
1231         // exports a JSON for receipt printing
1232         export_for_printing: function(){
1233             var orderlines = [];
1234             this.get('orderLines').each(function(orderline){
1235                 orderlines.push(orderline.export_for_printing());
1236             });
1237
1238             var paymentlines = [];
1239             this.get('paymentLines').each(function(paymentline){
1240                 paymentlines.push(paymentline.export_for_printing());
1241             });
1242             var client  = this.get('client');
1243             var cashier = this.pos.cashier || this.pos.user;
1244             var company = this.pos.company;
1245             var shop    = this.pos.shop;
1246             var date = new Date();
1247
1248             return {
1249                 orderlines: orderlines,
1250                 paymentlines: paymentlines,
1251                 subtotal: this.getSubtotal(),
1252                 total_with_tax: this.getTotalTaxIncluded(),
1253                 total_without_tax: this.getTotalTaxExcluded(),
1254                 total_tax: this.getTax(),
1255                 total_paid: this.getPaidTotal(),
1256                 total_discount: this.getDiscountTotal(),
1257                 tax_details: this.getTaxDetails(),
1258                 change: this.getChange(),
1259                 name : this.getName(),
1260                 client: client ? client.name : null ,
1261                 invoice_id: null,   //TODO
1262                 cashier: cashier ? cashier.name : null,
1263                 header: this.pos.config.receipt_header || '',
1264                 footer: this.pos.config.receipt_footer || '',
1265                 precision: {
1266                     price: 2,
1267                     money: 2,
1268                     quantity: 3,
1269                 },
1270                 date: {
1271                     year: date.getFullYear(),
1272                     month: date.getMonth(),
1273                     date: date.getDate(),       // day of the month
1274                     day: date.getDay(),         // day of the week
1275                     hour: date.getHours(),
1276                     minute: date.getMinutes() ,
1277                     isostring: date.toISOString(),
1278                     localestring: date.toLocaleString(),
1279                 },
1280                 company:{
1281                     email: company.email,
1282                     website: company.website,
1283                     company_registry: company.company_registry,
1284                     contact_address: company.partner_id[1],
1285                     vat: company.vat,
1286                     name: company.name,
1287                     phone: company.phone,
1288                     logo:  this.pos.company_logo_base64,
1289                 },
1290                 shop:{
1291                     name: shop.name,
1292                 },
1293                 currency: this.pos.currency,
1294             };
1295         },
1296         export_as_JSON: function() {
1297             var orderLines, paymentLines;
1298             orderLines = [];
1299             (this.get('orderLines')).each(_.bind( function(item) {
1300                 return orderLines.push([0, 0, item.export_as_JSON()]);
1301             }, this));
1302             paymentLines = [];
1303             (this.get('paymentLines')).each(_.bind( function(item) {
1304                 return paymentLines.push([0, 0, item.export_as_JSON()]);
1305             }, this));
1306             return {
1307                 name: this.getName(),
1308                 amount_paid: this.getPaidTotal(),
1309                 amount_total: this.getTotalTaxIncluded(),
1310                 amount_tax: this.getTax(),
1311                 amount_return: this.getChange(),
1312                 lines: orderLines,
1313                 statement_ids: paymentLines,
1314                 pos_session_id: this.pos.pos_session.id,
1315                 partner_id: this.get_client() ? this.get_client().id : false,
1316                 user_id: this.pos.cashier ? this.pos.cashier.id : this.pos.user.id,
1317                 uid: this.uid,
1318                 sequence_number: this.sequence_number,
1319             };
1320         },
1321         getSelectedLine: function(){
1322             return this.selected_orderline;
1323         },
1324         selectLine: function(line){
1325             if(line){
1326                 if(line !== this.selected_orderline){
1327                     if(this.selected_orderline){
1328                         this.selected_orderline.set_selected(false);
1329                     }
1330                     this.selected_orderline = line;
1331                     this.selected_orderline.set_selected(true);
1332                 }
1333             }else{
1334                 this.selected_orderline = undefined;
1335             }
1336         },
1337         deselectLine: function(){
1338             if(this.selected_orderline){
1339                 this.selected_orderline.set_selected(false);
1340                 this.selected_orderline = undefined;
1341             }
1342         },
1343         selectPaymentline: function(line){
1344             if(line !== this.selected_paymentline){
1345                 if(this.selected_paymentline){
1346                     this.selected_paymentline.set_selected(false);
1347                 }
1348                 this.selected_paymentline = line;
1349                 if(this.selected_paymentline){
1350                     this.selected_paymentline.set_selected(true);
1351                 }
1352                 this.trigger('change:selected_paymentline',this.selected_paymentline);
1353             }
1354         },
1355     });
1356
1357     module.OrderCollection = Backbone.Collection.extend({
1358         model: module.Order,
1359     });
1360
1361     /*
1362      The numpad handles both the choice of the property currently being modified
1363      (quantity, price or discount) and the edition of the corresponding numeric value.
1364      */
1365     module.NumpadState = Backbone.Model.extend({
1366         defaults: {
1367             buffer: "0",
1368             mode: "quantity"
1369         },
1370         appendNewChar: function(newChar) {
1371             var oldBuffer;
1372             oldBuffer = this.get('buffer');
1373             if (oldBuffer === '0') {
1374                 this.set({
1375                     buffer: newChar
1376                 });
1377             } else if (oldBuffer === '-0') {
1378                 this.set({
1379                     buffer: "-" + newChar
1380                 });
1381             } else {
1382                 this.set({
1383                     buffer: (this.get('buffer')) + newChar
1384                 });
1385             }
1386             this.trigger('set_value',this.get('buffer'));
1387         },
1388         deleteLastChar: function() {
1389             if(this.get('buffer') === ""){
1390                 if(this.get('mode') === 'quantity'){
1391                     this.trigger('set_value','remove');
1392                 }else{
1393                     this.trigger('set_value',this.get('buffer'));
1394                 }
1395             }else{
1396                 var newBuffer = this.get('buffer').slice(0,-1) || "";
1397                 this.set({ buffer: newBuffer });
1398                 this.trigger('set_value',this.get('buffer'));
1399             }
1400         },
1401         switchSign: function() {
1402             var oldBuffer;
1403             oldBuffer = this.get('buffer');
1404             this.set({
1405                 buffer: oldBuffer[0] === '-' ? oldBuffer.substr(1) : "-" + oldBuffer
1406             });
1407             this.trigger('set_value',this.get('buffer'));
1408         },
1409         changeMode: function(newMode) {
1410             this.set({
1411                 buffer: "0",
1412                 mode: newMode
1413             });
1414         },
1415         reset: function() {
1416             this.set({
1417                 buffer: "0",
1418                 mode: "quantity"
1419             });
1420         },
1421         resetValue: function(){
1422             this.set({buffer:'0'});
1423         },
1424     });
1425 }