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
 313                 // Waiting for fonts to be loaded to prevent receipt printing
 314                 // from printing empty receipt while loading Inconsolata
 315                 // ( The font used for the receipt )
 316                 waitForWebfonts(['Lato','Inconsolata'], function(){
 317                     fonts_loaded.resolve();
 318                 });
 319
 320                 // The JS used to detect font loading is not 100% robust, so
 321                 // do not wait more than 5sec
 322                 setTimeout(function(){
 323                     fonts_loaded.resolve();
 324                 },5000);
 325
 326                 return fonts_loaded;
 327             },
 328         },{
 329             label: 'pictures',
 330             loaded: function(self){
 331                 self.company_logo = new Image();
 332                 var  logo_loaded = new $.Deferred();
 333                 self.company_logo.onload = function(){
 334                     var img = self.company_logo;
 335                     var ratio = 1;
 336                     var targetwidth = 300;
 337                     var maxheight = 150;
 338                     if( img.width !== targetwidth ){
 339                         ratio = targetwidth / img.width;
 340                     }
 341                     if( img.height * ratio > maxheight ){
 342                         ratio = maxheight / img.height;
 343                     }
 344                     var width  = Math.floor(img.width * ratio);
 345                     var height = Math.floor(img.height * ratio);
 346                     var c = document.createElement('canvas');
 347                         c.width  = width;
 348                         c.height = height
 349                     var ctx = c.getContext('2d');
 350                         ctx.drawImage(self.company_logo,0,0, width, height);
 351
 352                     self.company_logo_base64 = c.toDataURL();
 353                     logo_loaded.resolve();
 354                 };
 355                 self.company_logo.onerror = function(){
 356                     logo_loaded.reject();
 357                 };
 358                     self.company_logo.crossOrigin = "anonymous";
 359                 self.company_logo.src = '/web/binary/company_logo' +'?_'+Math.random();
 360
 361                 return logo_loaded;
 362             },
 363         },
 364         ],
 365
 366         // loads all the needed data on the sever. returns a deferred indicating when all the data has loaded.
 367         load_server_data: function(){
 368             var self = this;
 369             var loaded = new $.Deferred();
 370             var progress = 0;
 371             var progress_step = 1.0 / self.models.length;
 372             var tmp = {}; // this is used to share a temporary state between models loaders
 373
 374             function load_model(index){
 375                 if(index >= self.models.length){
 376                     loaded.resolve();
 377                 }else{
 378                     var model = self.models[index];
 379                     self.pos_widget.loading_message(_t('Loading')+' '+(model.label || model.model || ''), progress);
 380                     var fields =  typeof model.fields === 'function'  ? model.fields(self,tmp)  : model.fields;
 381                     var domain =  typeof model.domain === 'function'  ? model.domain(self,tmp)  : model.domain;
 382                     var context = typeof model.context === 'function' ? model.context(self,tmp) : model.context;
 383                     var ids     = typeof model.ids === 'function'     ? model.ids(self,tmp) : model.ids;
 384                     progress += progress_step;
 385
 386
 387                     if( model.model ){
 388                         if (model.ids) {
 389                             var records = new instance.web.Model(model.model).call('read',[ids,fields],context);
 390                         } else {
 391                             var records = new instance.web.Model(model.model).query(fields).filter(domain).context(context).all()
 392                         }
 393                         records.then(function(result){
 394                                 try{    // catching exceptions in model.loaded(...)
 395                                     $.when(model.loaded(self,result,tmp))
 396                                         .then(function(){ load_model(index + 1); },
 397                                               function(err){ loaded.reject(err); });
 398                                 }catch(err){
 399                                     loaded.reject(err);
 400                                 }
 401                             },function(err){
 402                                 loaded.reject(err);
 403                             });
 404                     }else if( model.loaded ){
 405                         try{    // catching exceptions in model.loaded(...)
 406                             $.when(model.loaded(self,tmp))
 407                                 .then(  function(){ load_model(index +1); },
 408                                         function(err){ loaded.reject(err); });
 409                         }catch(err){
 410                             loaded.reject(err);
 411                         }
 412                     }else{
 413                         load_model(index + 1);
 414                     }
 415                 }
 416             }
 417
 418             try{
 419                 load_model(0);
 420             }catch(err){
 421                 loaded.reject(err);
 422             }
 423
 424             return loaded;
 425         },
 426
 427         // reload the list of partner, returns as a deferred that resolves if there were
 428         // updated partners, and fails if not
 429         load_new_partners: function(){
 430             var self = this;
 431             var def  = new $.Deferred();
 432             var fields = _.find(this.models,function(model){ return model.model === 'res.partner'; }).fields;
 433             new instance.web.Model('res.partner')
 434                 .query(fields)
 435                 .filter([['write_date','>',this.db.get_partner_write_date()]])
 436                 .all({'timeout':3000, 'shadow': true})
 437                 .then(function(partners){
 438                     if (self.db.add_partners(partners)) {   // check if the partners we got were real updates
 439                         def.resolve();
 440                     } else {
 441                         def.reject();
 442                     }
 443                 }, function(){ def.reject(); });
 444             return def;
 445         },
 446
 447         // this is called when an order is removed from the order collection. It ensures that there is always an existing
 448         // order and a valid selected order
 449         on_removed_order: function(removed_order,index,reason){
 450             if( (reason === 'abandon' || removed_order.temporary) && this.get('orders').size() > 0){
 451                 // when we intentionally remove an unfinished order, and there is another existing one
 452                 this.set({'selectedOrder' : this.get('orders').at(index) || this.get('orders').last()});
 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         },
 466
 467         get_order: function(){
 468             return this.get('selectedOrder');
 469         },
 470
 471         //removes the current order
 472         delete_current_order: function(){
 473             this.get('selectedOrder').destroy({'reason':'abandon'});
 474         },
 475
 476         // saves the order locally and try to send it to the backend.
 477         // it returns a deferred that succeeds after having tried to send the order and all the other pending orders.
 478         push_order: function(order) {
 479             var self = this;
 480
 481             if(order){
 482                 this.proxy.log('push_order',order.export_as_JSON());
 483                 this.db.add_order(order.export_as_JSON());
 484             }
 485
 486             var pushed = new $.Deferred();
 487
 488             this.flush_mutex.exec(function(){
 489                 var flushed = self._flush_orders(self.db.get_orders());
 490
 491                 flushed.always(function(ids){
 492                     pushed.resolve();
 493                 });
 494             });
 495             return pushed;
 496         },
 497
 498         // saves the order locally and try to send it to the backend and make an invoice
 499         // returns a deferred that succeeds when the order has been posted and successfully generated
 500         // an invoice. This method can fail in various ways:
 501         // error-no-client: the order must have an associated partner_id. You can retry to make an invoice once
 502         //     this error is solved
 503         // error-transfer: there was a connection error during the transfer. You can retry to make the invoice once
 504         //     the network connection is up
 505
 506         push_and_invoice_order: function(order){
 507             var self = this;
 508             var invoiced = new $.Deferred();
 509
 510             if(!order.get_client()){
 511                 invoiced.reject('error-no-client');
 512                 return invoiced;
 513             }
 514
 515             var order_id = this.db.add_order(order.export_as_JSON());
 516
 517             this.flush_mutex.exec(function(){
 518                 var done = new $.Deferred(); // holds the mutex
 519
 520                 // send the order to the server
 521                 // we have a 30 seconds timeout on this push.
 522                 // FIXME: if the server takes more than 30 seconds to accept the order,
 523                 // the client will believe it wasn't successfully sent, and very bad
 524                 // things will happen as a duplicate will be sent next time
 525                 // so we must make sure the server detects and ignores duplicated orders
 526
 527                 var transfer = self._flush_orders([self.db.get_order(order_id)], {timeout:30000, to_invoice:true});
 528
 529                 transfer.fail(function(){
 530                     invoiced.reject('error-transfer');
 531                     done.reject();
 532                 });
 533
 534                 // on success, get the order id generated by the server
 535                 transfer.pipe(function(order_server_id){
 536
 537                     // generate the pdf and download it
 538                     self.pos_widget.do_action('point_of_sale.pos_invoice_report',{additional_context:{
 539                         active_ids:order_server_id,
 540                     }});
 541
 542                     invoiced.resolve();
 543                     done.resolve();
 544                 });
 545
 546                 return done;
 547
 548             });
 549
 550             return invoiced;
 551         },
 552
 553         // wrapper around the _save_to_server that updates the synch status widget
 554         _flush_orders: function(orders, options) {
 555             var self = this;
 556
 557             this.set('synch',{ state: 'connecting', pending: orders.length});
 558
 559             return self._save_to_server(orders, options).done(function (server_ids) {
 560                 var pending = self.db.get_orders().length;
 561
 562                 self.set('synch', {
 563                     state: pending ? 'connecting' : 'connected',
 564                     pending: pending
 565                 });
 566
 567                 return server_ids;
 568             });
 569         },
 570
 571         // send an array of orders to the server
 572         // available options:
 573         // - timeout: timeout for the rpc call in ms
 574         // returns a deferred that resolves with the list of
 575         // server generated ids for the sent orders
 576         _save_to_server: function (orders, options) {
 577             if (!orders || !orders.length) {
 578                 var result = $.Deferred();
 579                 result.resolve([]);
 580                 return result;
 581             }
 582
 583             options = options || {};
 584
 585             var self = this;
 586             var timeout = typeof options.timeout === 'number' ? options.timeout : 7500 * orders.length;
 587
 588             // we try to send the order. shadow prevents a spinner if it takes too long. (unless we are sending an invoice,
 589             // then we want to notify the user that we are waiting on something )
 590             var posOrderModel = new instance.web.Model('pos.order');
 591             return posOrderModel.call('create_from_ui',
 592                 [_.map(orders, function (order) {
 593                     order.to_invoice = options.to_invoice || false;
 594                     return order;
 595                 })],
 596                 undefined,
 597                 {
 598                     shadow: !options.to_invoice,
 599                     timeout: timeout
 600                 }
 601             ).then(function (server_ids) {
 602                 _.each(orders, function (order) {
 603                     self.db.remove_order(order.id);
 604                 });
 605                 return server_ids;
 606             }).fail(function (error, event){
 607                 if(error.code === 200 ){    // Business Logic Error, not a connection problem
 608                     self.pos_widget.screen_selector.show_popup('error-traceback',{
 609                         message: error.data.message,
 610                         comment: error.data.debug
 611                     });
 612                 }
 613                 // prevent an error popup creation by the rpc failure
 614                 // we want the failure to be silent as we send the orders in the background
 615                 event.preventDefault();
 616                 console.error('Failed to send orders:', orders);
 617             });
 618         },
 619
 620         scan_product: function(parsed_code){
 621             var self = this;
 622             var selectedOrder = this.get('selectedOrder');
 623             if(parsed_code.encoding === 'ean13'){
 624                 var product = this.db.get_product_by_ean13(parsed_code.base_code);
 625             }else if(parsed_code.encoding === 'reference'){
 626                 var product = this.db.get_product_by_reference(parsed_code.code);
 627             }
 628
 629             if(!product){
 630                 return false;
 631             }
 632
 633             if(parsed_code.type === 'price'){
 634                 selectedOrder.addProduct(product, {price:parsed_code.value});
 635             }else if(parsed_code.type === 'weight'){
 636                 selectedOrder.addProduct(product, {quantity:parsed_code.value, merge:false});
 637             }else if(parsed_code.type === 'discount'){
 638                 selectedOrder.addProduct(product, {discount:parsed_code.value, merge:false});
 639             }else{
 640                 selectedOrder.addProduct(product);
 641             }
 642             return true;
 643         },
 644     });
 645
 646     var orderline_id = 1;
 647
 648     // An orderline represent one element of the content of a client's shopping cart.
 649     // An orderline contains a product, its quantity, its price, discount. etc.
 650     // An Order contains zero or more Orderlines.
 651     module.Orderline = Backbone.Model.extend({
 652         initialize: function(attr,options){
 653             this.pos = options.pos;
 654             this.order = options.order;
 655             this.product = options.product;
 656             this.price   = options.product.price;
 657             this.quantity = 1;
 658             this.quantityStr = '1';
 659             this.discount = 0;
 660             this.discountStr = '0';
 661             this.type = 'unit';
 662             this.selected = false;
 663             this.id       = orderline_id++;
 664         },
 665         clone: function(){
 666             var orderline = new module.Orderline({},{
 667                 pos: this.pos,
 668                 order: null,
 669                 product: this.product,
 670                 price: this.price,
 671             });
 672             orderline.quantity = this.quantity;
 673             orderline.quantityStr = this.quantityStr;
 674             orderline.discount = this.discount;
 675             orderline.type = this.type;
 676             orderline.selected = false;
 677             return orderline;
 678         },
 679         // sets a discount [0,100]%
 680         set_discount: function(discount){
 681             var disc = Math.min(Math.max(parseFloat(discount) || 0, 0),100);
 682             this.discount = disc;
 683             this.discountStr = '' + disc;
 684             this.trigger('change',this);
 685         },
 686         // returns the discount [0,100]%
 687         get_discount: function(){
 688             return this.discount;
 689         },
 690         get_discount_str: function(){
 691             return this.discountStr;
 692         },
 693         get_product_type: function(){
 694             return this.type;
 695         },
 696         // sets the quantity of the product. The quantity will be rounded according to the
 697         // product's unity of measure properties. Quantities greater than zero will not get
 698         // rounded to zero
 699         set_quantity: function(quantity){
 700             if(quantity === 'remove'){
 701                 this.order.removeOrderline(this);
 702                 return;
 703             }else{
 704                 var quant = parseFloat(quantity) || 0;
 705                 var unit = this.get_unit();
 706                 if(unit){
 707                     if (unit.rounding) {
 708                         this.quantity    = round_pr(quant, unit.rounding);
 709                         this.quantityStr = this.quantity.toFixed(Math.ceil(Math.log(1.0 / unit.rounding) / Math.log(10)));
 710                     } else {
 711                         this.quantity    = round_pr(quant, 1);
 712                         this.quantityStr = this.quantity.toFixed(0);
 713                     }
 714                 }else{
 715                     this.quantity    = quant;
 716                     this.quantityStr = '' + this.quantity;
 717                 }
 718             }
 719             this.trigger('change',this);
 720         },
 721         // return the quantity of product
 722         get_quantity: function(){
 723             return this.quantity;
 724         },
 725         get_quantity_str: function(){
 726             return this.quantityStr;
 727         },
 728         get_quantity_str_with_unit: function(){
 729             var unit = this.get_unit();
 730             if(unit && !unit.is_unit){
 731                 return this.quantityStr + ' ' + unit.name;
 732             }else{
 733                 return this.quantityStr;
 734             }
 735         },
 736         // return the unit of measure of the product
 737         get_unit: function(){
 738             var unit_id = (this.product.uos_id || this.product.uom_id);
 739             if(!unit_id){
 740                 return undefined;
 741             }
 742             unit_id = unit_id[0];
 743             if(!this.pos){
 744                 return undefined;
 745             }
 746             return this.pos.units_by_id[unit_id];
 747         },
 748         // return the product of this orderline
 749         get_product: function(){
 750             return this.product;
 751         },
 752         // selects or deselects this orderline
 753         set_selected: function(selected){
 754             this.selected = selected;
 755             this.trigger('change',this);
 756         },
 757         // returns true if this orderline is selected
 758         is_selected: function(){
 759             return this.selected;
 760         },
 761         // when we add an new orderline we want to merge it with the last line to see reduce the number of items
 762         // in the orderline. This returns true if it makes sense to merge the two
 763         can_be_merged_with: function(orderline){
 764             if( this.get_product().id !== orderline.get_product().id){    //only orderline of the same product can be merged
 765                 return false;
 766             }else if(!this.get_unit() || !this.get_unit().groupable){
 767                 return false;
 768             }else if(this.get_product_type() !== orderline.get_product_type()){
 769                 return false;
 770             }else if(this.get_discount() > 0){             // we don't merge discounted orderlines
 771                 return false;
 772             }else if(this.price !== orderline.price){
 773                 return false;
 774             }else{
 775                 return true;
 776             }
 777         },
 778         merge: function(orderline){
 779             this.set_quantity(this.get_quantity() + orderline.get_quantity());
 780         },
 781         export_as_JSON: function() {
 782             return {
 783                 qty: this.get_quantity(),
 784                 price_unit: this.get_unit_price(),
 785                 discount: this.get_discount(),
 786                 product_id: this.get_product().id,
 787             };
 788         },
 789         //used to create a json of the ticket, to be sent to the printer
 790         export_for_printing: function(){
 791             return {
 792                 quantity:           this.get_quantity(),
 793                 unit_name:          this.get_unit().name,
 794                 price:              this.get_unit_price(),
 795                 discount:           this.get_discount(),
 796                 product_name:       this.get_product().display_name,
 797                 price_display :     this.get_display_price(),
 798                 price_with_tax :    this.get_price_with_tax(),
 799                 price_without_tax:  this.get_price_without_tax(),
 800                 tax:                this.get_tax(),
 801                 product_description:      this.get_product().description,
 802                 product_description_sale: this.get_product().description_sale,
 803             };
 804         },
 805         // changes the base price of the product for this orderline
 806         set_unit_price: function(price){
 807             this.price = round_di(parseFloat(price) || 0, this.pos.dp['Product Price']);
 808             this.trigger('change',this);
 809         },
 810         get_unit_price: function(){
 811             return this.price;
 812         },
 813         get_display_price: function(){
 814             var rounding = this.pos.currency.rounding;
 815             return  round_pr(round_pr(this.get_unit_price() * this.get_quantity(),rounding) * (1- this.get_discount()/100.0),rounding);
 816         },
 817         get_price_without_tax: function(){
 818             return this.get_all_prices().priceWithoutTax;
 819         },
 820         get_price_with_tax: function(){
 821             return this.get_all_prices().priceWithTax;
 822         },
 823         get_tax: function(){
 824             return this.get_all_prices().tax;
 825         },
 826         get_tax_details: function(){
 827             return this.get_all_prices().taxDetails;
 828         },
 829         get_all_prices: function(){
 830             var self = this;
 831             var currency_rounding = this.pos.currency.rounding;
 832             var base = round_pr(this.get_quantity() * this.get_unit_price() * (1.0 - (this.get_discount() / 100.0)), currency_rounding);
 833             var totalTax = base;
 834             var totalNoTax = base;
 835
 836             var product =  this.get_product();
 837             var taxes_ids = product.taxes_id;
 838             var taxes =  self.pos.taxes;
 839             var taxtotal = 0;
 840             var taxdetail = {};
 841             _.each(taxes_ids, function(el) {
 842                 var tax = _.detect(taxes, function(t) {return t.id === el;});
 843                 if (tax.price_include) {
 844                     var tmp;
 845                     if (tax.type === "percent") {
 846                         tmp =  base - round_pr(base / (1 + tax.amount),currency_rounding);
 847                     } else if (tax.type === "fixed") {
 848                         tmp = round_pr(tax.amount * self.get_quantity(),currency_rounding);
 849                     } else {
 850                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 851                     }
 852                     tmp = round_pr(tmp,currency_rounding);
 853                     taxtotal += tmp;
 854                     totalNoTax -= tmp;
 855                     taxdetail[tax.id] = tmp;
 856                 } else {
 857                     var tmp;
 858                     if (tax.type === "percent") {
 859                         tmp = tax.amount * base;
 860                     } else if (tax.type === "fixed") {
 861                         tmp = tax.amount * self.get_quantity();
 862                     } else {
 863                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 864                     }
 865                     tmp = round_pr(tmp,currency_rounding);
 866                     taxtotal += tmp;
 867                     totalTax += tmp;
 868                     taxdetail[tax.id] = tmp;
 869                 }
 870             });
 871             return {
 872                 "priceWithTax": totalTax,
 873                 "priceWithoutTax": totalNoTax,
 874                 "tax": taxtotal,
 875                 "taxDetails": taxdetail,
 876             };
 877         },
 878     });
 879
 880     module.OrderlineCollection = Backbone.Collection.extend({
 881         model: module.Orderline,
 882     });
 883
 884     // Every Paymentline contains a cashregister and an amount of money.
 885     module.Paymentline = Backbone.Model.extend({
 886         initialize: function(attributes, options) {
 887             this.amount = 0;
 888             this.cashregister = options.cashregister;
 889             this.name = this.cashregister.journal_id[1];
 890             this.selected = false;
 891             this.pos = options.pos;
 892         },
 893         //sets the amount of money on this payment line
 894         set_amount: function(value){
 895             this.amount = round_di(parseFloat(value) || 0, this.pos.currency.decimals);
 896             this.trigger('change:amount',this);
 897         },
 898         // returns the amount of money on this paymentline
 899         get_amount: function(){
 900             return this.amount;
 901         },
 902         get_amount_str: function(){
 903             return this.amount.toFixed(this.pos.currency.decimals);
 904         },
 905         set_selected: function(selected){
 906             if(this.selected !== selected){
 907                 this.selected = selected;
 908                 this.trigger('change:selected',this);
 909             }
 910         },
 911         // returns the associated cashregister
 912         //exports as JSON for server communication
 913         export_as_JSON: function(){
 914             return {
 915                 name: instance.web.datetime_to_str(new Date()),
 916                 statement_id: this.cashregister.id,
 917                 account_id: this.cashregister.account_id[0],
 918                 journal_id: this.cashregister.journal_id[0],
 919                 amount: this.get_amount()
 920             };
 921         },
 922         //exports as JSON for receipt printing
 923         export_for_printing: function(){
 924             return {
 925                 amount: this.get_amount(),
 926                 journal: this.cashregister.journal_id[1],
 927             };
 928         },
 929     });
 930
 931     module.PaymentlineCollection = Backbone.Collection.extend({
 932         model: module.Paymentline,
 933     });
 934
 935
 936     // An order more or less represents the content of a client's shopping cart (the OrderLines)
 937     // plus the associated payment information (the Paymentlines)
 938     // there is always an active ('selected') order in the Pos, a new one is created
 939     // automaticaly once an order is completed and sent to the server.
 940     module.Order = Backbone.Model.extend({
 941         initialize: function(attributes){
 942             Backbone.Model.prototype.initialize.apply(this, arguments);
 943             this.pos = attributes.pos;
 944             this.sequence_number = this.pos.pos_session.sequence_number++;
 945             this.uid =     this.generateUniqueId();
 946             this.set({
 947                 creationDate:   new Date(),
 948                 orderLines:     new module.OrderlineCollection(),
 949                 paymentLines:   new module.PaymentlineCollection(),
 950                 name:           _t("Order ") + this.uid,
 951                 client:         null,
 952             });
 953             this.selected_orderline   = undefined;
 954             this.selected_paymentline = undefined;
 955             this.screen_data = {};  // see ScreenSelector
 956             this.receipt_type = 'receipt';  // 'receipt' || 'invoice'
 957             this.temporary = attributes.temporary || false;
 958             return this;
 959         },
 960         is_empty: function(){
 961             return (this.get('orderLines').models.length === 0);
 962         },
 963         // Generates a public identification number for the order.
 964         // The generated number must be unique and sequential. They are made 12 digit long
 965         // to fit into EAN-13 barcodes, should it be needed
 966         generateUniqueId: function() {
 967             function zero_pad(num,size){
 968                 var s = ""+num;
 969                 while (s.length < size) {
 970                     s = "0" + s;
 971                 }
 972                 return s;
 973             }
 974             return zero_pad(this.pos.pos_session.id,5) +'-'+
 975                    zero_pad(this.pos.pos_session.login_number,3) +'-'+
 976                    zero_pad(this.sequence_number,4);
 977         },
 978         addOrderline: function(line){
 979             if(line.order){
 980                 order.removeOrderline(line);
 981             }
 982             line.order = this;
 983             this.get('orderLines').add(line);
 984             this.selectLine(this.getLastOrderline());
 985         },
 986         addProduct: function(product, options){
 987             options = options || {};
 988             var attr = JSON.parse(JSON.stringify(product));
 989             attr.pos = this.pos;
 990             attr.order = this;
 991             var line = new module.Orderline({}, {pos: this.pos, order: this, product: product});
 992
 993             if(options.quantity !== undefined){
 994                 line.set_quantity(options.quantity);
 995             }
 996             if(options.price !== undefined){
 997                 line.set_unit_price(options.price);
 998             }
 999             if(options.discount !== undefined){
1000                 line.set_discount(options.discount);
1001             }
1002
1003             var last_orderline = this.getLastOrderline();
1004             if( last_orderline && last_orderline.can_be_merged_with(line) && options.merge !== false){
1005                 last_orderline.merge(line);
1006             }else{
1007                 this.get('orderLines').add(line);
1008             }
1009             this.selectLine(this.getLastOrderline());
1010         },
1011         removeOrderline: function( line ){
1012             this.get('orderLines').remove(line);
1013             this.selectLine(this.getLastOrderline());
1014         },
1015         getOrderline: function(id){
1016             var orderlines = this.get('orderLines').models;
1017             for(var i = 0; i < orderlines.length; i++){
1018                 if(orderlines[i].id === id){
1019                     return orderlines[i];
1020                 }
1021             }
1022             return null;
1023         },
1024         getLastOrderline: function(){
1025             return this.get('orderLines').at(this.get('orderLines').length -1);
1026         },
1027         addPaymentline: function(cashregister) {
1028             var paymentLines = this.get('paymentLines');
1029             var newPaymentline = new module.Paymentline({},{cashregister:cashregister, pos:this.pos});
1030             if(cashregister.journal.type !== 'cash'){
1031                 newPaymentline.set_amount( Math.max(this.getDueLeft(),0) );
1032             }
1033             paymentLines.add(newPaymentline);
1034             this.selectPaymentline(newPaymentline);
1035
1036         },
1037         removePaymentline: function(line){
1038             if(this.selected_paymentline === line){
1039                 this.selectPaymentline(undefined);
1040             }
1041             this.get('paymentLines').remove(line);
1042         },
1043         getName: function() {
1044             return this.get('name');
1045         },
1046         getSubtotal : function(){
1047             return (this.get('orderLines')).reduce((function(sum, orderLine){
1048                 return sum + orderLine.get_display_price();
1049             }), 0);
1050         },
1051         getTotalTaxIncluded: function() {
1052             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1053                 return sum + orderLine.get_price_with_tax();
1054             }), 0);
1055         },
1056         getDiscountTotal: function() {
1057             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1058                 return sum + (orderLine.get_unit_price() * (orderLine.get_discount()/100) * orderLine.get_quantity());
1059             }), 0);
1060         },
1061         getTotalTaxExcluded: function() {
1062             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1063                 return sum + orderLine.get_price_without_tax();
1064             }), 0);
1065         },
1066         getTax: function() {
1067             return (this.get('orderLines')).reduce((function(sum, orderLine) {
1068                 return sum + orderLine.get_tax();
1069             }), 0);
1070         },
1071         getTaxDetails: function(){
1072             var details = {};
1073             var fulldetails = [];
1074             var taxes_by_id = {};
1075
1076             for(var i = 0; i < this.pos.taxes.length; i++){
1077                 taxes_by_id[this.pos.taxes[i].id] = this.pos.taxes[i];
1078             }
1079
1080             this.get('orderLines').each(function(line){
1081                 var ldetails = line.get_tax_details();
1082                 for(var id in ldetails){
1083                     if(ldetails.hasOwnProperty(id)){
1084                         details[id] = (details[id] || 0) + ldetails[id];
1085                     }
1086                 }
1087             });
1088
1089             for(var id in details){
1090                 if(details.hasOwnProperty(id)){
1091                     fulldetails.push({amount: details[id], tax: taxes_by_id[id], name: taxes_by_id[id].name});
1092                 }
1093             }
1094
1095             return fulldetails;
1096         },
1097         getPaidTotal: function() {
1098             return (this.get('paymentLines')).reduce((function(sum, paymentLine) {
1099                 return sum + paymentLine.get_amount();
1100             }), 0);
1101         },
1102         getChange: function() {
1103             return this.getPaidTotal() - this.getTotalTaxIncluded();
1104         },
1105         getDueLeft: function() {
1106             return this.getTotalTaxIncluded() - this.getPaidTotal();
1107         },
1108         // sets the type of receipt 'receipt'(default) or 'invoice'
1109         set_receipt_type: function(type){
1110             this.receipt_type = type;
1111         },
1112         get_receipt_type: function(){
1113             return this.receipt_type;
1114         },
1115         // the client related to the current order.
1116         set_client: function(client){
1117             this.set('client',client);
1118         },
1119         get_client: function(){
1120             return this.get('client');
1121         },
1122         get_client_name: function(){
1123             var client = this.get('client');
1124             return client ? client.name : "";
1125         },
1126         // the order also stores the screen status, as the PoS supports
1127         // different active screens per order. This method is used to
1128         // store the screen status.
1129         set_screen_data: function(key,value){
1130             if(arguments.length === 2){
1131                 this.screen_data[key] = value;
1132             }else if(arguments.length === 1){
1133                 for(key in arguments[0]){
1134                     this.screen_data[key] = arguments[0][key];
1135                 }
1136             }
1137         },
1138         //see set_screen_data
1139         get_screen_data: function(key){
1140             return this.screen_data[key];
1141         },
1142         // exports a JSON for receipt printing
1143         export_for_printing: function(){
1144             var orderlines = [];
1145             this.get('orderLines').each(function(orderline){
1146                 orderlines.push(orderline.export_for_printing());
1147             });
1148
1149             var paymentlines = [];
1150             this.get('paymentLines').each(function(paymentline){
1151                 paymentlines.push(paymentline.export_for_printing());
1152             });
1153             var client  = this.get('client');
1154             var cashier = this.pos.cashier || this.pos.user;
1155             var company = this.pos.company;
1156             var shop    = this.pos.shop;
1157             var date = new Date();
1158
1159             return {
1160                 orderlines: orderlines,
1161                 paymentlines: paymentlines,
1162                 subtotal: this.getSubtotal(),
1163                 total_with_tax: this.getTotalTaxIncluded(),
1164                 total_without_tax: this.getTotalTaxExcluded(),
1165                 total_tax: this.getTax(),
1166                 total_paid: this.getPaidTotal(),
1167                 total_discount: this.getDiscountTotal(),
1168                 tax_details: this.getTaxDetails(),
1169                 change: this.getChange(),
1170                 name : this.getName(),
1171                 client: client ? client.name : null ,
1172                 invoice_id: null,   //TODO
1173                 cashier: cashier ? cashier.name : null,
1174                 header: this.pos.config.receipt_header || '',
1175                 footer: this.pos.config.receipt_footer || '',
1176                 precision: {
1177                     price: 2,
1178                     money: 2,
1179                     quantity: 3,
1180                 },
1181                 date: {
1182                     year: date.getFullYear(),
1183                     month: date.getMonth(),
1184                     date: date.getDate(),       // day of the month
1185                     day: date.getDay(),         // day of the week
1186                     hour: date.getHours(),
1187                     minute: date.getMinutes() ,
1188                     isostring: date.toISOString(),
1189                     localestring: date.toLocaleString(),
1190                 },
1191                 company:{
1192                     email: company.email,
1193                     website: company.website,
1194                     company_registry: company.company_registry,
1195                     contact_address: company.partner_id[1],
1196                     vat: company.vat,
1197                     name: company.name,
1198                     phone: company.phone,
1199                     logo:  this.pos.company_logo_base64,
1200                 },
1201                 shop:{
1202                     name: shop.name,
1203                 },
1204                 currency: this.pos.currency,
1205             };
1206         },
1207         export_as_JSON: function() {
1208             var orderLines, paymentLines;
1209             orderLines = [];
1210             (this.get('orderLines')).each(_.bind( function(item) {
1211                 return orderLines.push([0, 0, item.export_as_JSON()]);
1212             }, this));
1213             paymentLines = [];
1214             (this.get('paymentLines')).each(_.bind( function(item) {
1215                 return paymentLines.push([0, 0, item.export_as_JSON()]);
1216             }, this));
1217             return {
1218                 name: this.getName(),
1219                 amount_paid: this.getPaidTotal(),
1220                 amount_total: this.getTotalTaxIncluded(),
1221                 amount_tax: this.getTax(),
1222                 amount_return: this.getChange(),
1223                 lines: orderLines,
1224                 statement_ids: paymentLines,
1225                 pos_session_id: this.pos.pos_session.id,
1226                 partner_id: this.get_client() ? this.get_client().id : false,
1227                 user_id: this.pos.cashier ? this.pos.cashier.id : this.pos.user.id,
1228                 uid: this.uid,
1229                 sequence_number: this.sequence_number,
1230             };
1231         },
1232         getSelectedLine: function(){
1233             return this.selected_orderline;
1234         },
1235         selectLine: function(line){
1236             if(line){
1237                 if(line !== this.selected_orderline){
1238                     if(this.selected_orderline){
1239                         this.selected_orderline.set_selected(false);
1240                     }
1241                     this.selected_orderline = line;
1242                     this.selected_orderline.set_selected(true);
1243                 }
1244             }else{
1245                 this.selected_orderline = undefined;
1246             }
1247         },
1248         deselectLine: function(){
1249             if(this.selected_orderline){
1250                 this.selected_orderline.set_selected(false);
1251                 this.selected_orderline = undefined;
1252             }
1253         },
1254         selectPaymentline: function(line){
1255             if(line !== this.selected_paymentline){
1256                 if(this.selected_paymentline){
1257                     this.selected_paymentline.set_selected(false);
1258                 }
1259                 this.selected_paymentline = line;
1260                 if(this.selected_paymentline){
1261                     this.selected_paymentline.set_selected(true);
1262                 }
1263                 this.trigger('change:selected_paymentline',this.selected_paymentline);
1264             }
1265         },
1266     });
1267
1268     module.OrderCollection = Backbone.Collection.extend({
1269         model: module.Order,
1270     });
1271
1272     /*
1273      The numpad handles both the choice of the property currently being modified
1274      (quantity, price or discount) and the edition of the corresponding numeric value.
1275      */
1276     module.NumpadState = Backbone.Model.extend({
1277         defaults: {
1278             buffer: "0",
1279             mode: "quantity"
1280         },
1281         appendNewChar: function(newChar) {
1282             var oldBuffer;
1283             oldBuffer = this.get('buffer');
1284             if (oldBuffer === '0') {
1285                 this.set({
1286                     buffer: newChar
1287                 });
1288             } else if (oldBuffer === '-0') {
1289                 this.set({
1290                     buffer: "-" + newChar
1291                 });
1292             } else {
1293                 this.set({
1294                     buffer: (this.get('buffer')) + newChar
1295                 });
1296             }
1297             this.trigger('set_value',this.get('buffer'));
1298         },
1299         deleteLastChar: function() {
1300             if(this.get('buffer') === ""){
1301                 if(this.get('mode') === 'quantity'){
1302                     this.trigger('set_value','remove');
1303                 }else{
1304                     this.trigger('set_value',this.get('buffer'));
1305                 }
1306             }else{
1307                 var newBuffer = this.get('buffer').slice(0,-1) || "";
1308                 this.set({ buffer: newBuffer });
1309                 this.trigger('set_value',this.get('buffer'));
1310             }
1311         },
1312         switchSign: function() {
1313             var oldBuffer;
1314             oldBuffer = this.get('buffer');
1315             this.set({
1316                 buffer: oldBuffer[0] === '-' ? oldBuffer.substr(1) : "-" + oldBuffer
1317             });
1318             this.trigger('set_value',this.get('buffer'));
1319         },
1320         changeMode: function(newMode) {
1321             this.set({
1322                 buffer: "0",
1323                 mode: newMode
1324             });
1325         },
1326         reset: function() {
1327             this.set({
1328                 buffer: "0",
1329                 mode: "quantity"
1330             });
1331         },
1332         resetValue: function(){
1333             this.set({buffer:'0'});
1334         },
1335     });
1336 }