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});  // 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.company = null;
  38             this.user = null;
  39             this.users = [];
  40             this.partners = [];
  41             this.cashier = null;
  42             this.cashregisters = [];
  43             this.bankstatements = [];
  44             this.taxes = [];
  45             this.pos_session = null;
  46             this.config = null;
  47             this.units = [];
  48             this.units_by_id = {};
  49             this.pricelist = null;
  50             window.posmodel = this;
  51
  52             // these dynamic attributes can be watched for change by other models or widgets
  53             this.set({
  54                 'synch':            { state:'connected', pending:0 },
  55                 'orders':           new module.OrderCollection(),
  56                 'selectedOrder':    null,
  57             });
  58
  59             this.bind('change:synch',function(pos,synch){
  60                 clearTimeout(self.synch_timeout);
  61                 self.synch_timeout = setTimeout(function(){
  62                     if(synch.state !== 'disconnected' && synch.pending > 0){
  63                         self.set('synch',{state:'disconnected', pending:synch.pending});
  64                     }
  65                 },3000);
  66             });
  67
  68             this.get('orders').bind('remove', function(order,_unused_,options){
  69                 self.on_removed_order(order,options.index,options.reason);
  70             });
  71
  72             // We fetch the backend data on the server asynchronously. this is done only when the pos user interface is launched,
  73             // Any change on this data made on the server is thus not reflected on the point of sale until it is relaunched.
  74             // when all the data has loaded, we compute some stuff, and declare the Pos ready to be used.
  75             this.ready = this.load_server_data()
  76                 .then(function(){
  77                     if(self.config.use_proxy){
  78                         return self.connect_to_proxy();
  79                     }
  80                 });
  81
  82         },
  83
  84         // releases ressources holds by the model at the end of life of the posmodel
  85         destroy: function(){
  86             // FIXME, should wait for flushing, return a deferred to indicate successfull destruction
  87             // this.flush();
  88             this.proxy.close();
  89             this.barcode_reader.disconnect();
  90             this.barcode_reader.disconnect_from_proxy();
  91         },
  92         connect_to_proxy: function(){
  93             var self = this;
  94             var  done = new $.Deferred();
  95             this.barcode_reader.disconnect_from_proxy();
  96             this.pos_widget.loading_message(_t('Connecting to the PosBox'),0);
  97             this.pos_widget.loading_skip(function(){
  98                     self.proxy.stop_searching();
  99                 });
 100             this.proxy.autoconnect({
 101                     force_ip: self.config.proxy_ip || undefined,
 102                     progress: function(prog){
 103                         self.pos_widget.loading_progress(prog);
 104                     },
 105                 }).then(function(){
 106                     if(self.config.iface_scan_via_proxy){
 107                         self.barcode_reader.connect_to_proxy();
 108                     }
 109                 }).always(function(){
 110                     done.resolve();
 111                 });
 112             return done;
 113         },
 114
 115         // helper function to load data from the server
 116         fetch: function(model, fields, domain, ctx){
 117             this._load_progress = (this._load_progress || 0) + 0.05;
 118             this.pos_widget.loading_message(_t('Loading')+' '+model,this._load_progress);
 119             return new instance.web.Model(model).query(fields).filter(domain).context(ctx).all()
 120         },
 121         // loads all the needed data on the sever. returns a deferred indicating when all the data has loaded.
 122         load_server_data: function(){
 123             var self = this;
 124
 125             var loaded = self.fetch('res.users',['name','company_id'],[['id','=',this.session.uid]])
 126                 .then(function(users){
 127                     self.user = users[0];
 128
 129                     return self.fetch('res.company',
 130                     [
 131                         'currency_id',
 132                         'email',
 133                         'website',
 134                         'company_registry',
 135                         'vat',
 136                         'name',
 137                         'phone',
 138                         'partner_id',
 139                     ],
 140                     [['id','=',users[0].company_id[0]]],
 141                     {show_address_only: true});
 142                 }).then(function(companies){
 143                     self.company = companies[0];
 144
 145                     return self.fetch('product.uom', null, null);
 146                 }).then(function(units){
 147                     self.units = units;
 148                     var units_by_id = {};
 149                     for(var i = 0, len = units.length; i < len; i++){
 150                         units_by_id[units[i].id] = units[i];
 151                     }
 152                     self.units_by_id = units_by_id;
 153
 154                     return self.fetch('res.users', ['name','ean13'], [['ean13', '!=', false]]);
 155                 }).then(function(users){
 156                     self.users = users;
 157
 158                     return self.fetch('res.partner', ['name','ean13'], [['ean13', '!=', false]]);
 159                 }).then(function(partners){
 160                     self.partners = partners;
 161
 162                     return self.fetch('account.tax', ['name','amount', 'price_include', 'type']);
 163                 }).then(function(taxes){
 164                     self.taxes = taxes;
 165
 166                     return self.fetch(
 167                         'pos.session',
 168                         ['id', 'journal_ids','name','user_id','config_id','start_at','stop_at'],
 169                         [['state', '=', 'opened'], ['user_id', '=', self.session.uid]]
 170                     );
 171                 }).then(function(pos_sessions){
 172                     self.pos_session = pos_sessions[0];
 173
 174                     return self.fetch(
 175                         'pos.config',
 176                         ['name','journal_ids','journal_id','pricelist_id',
 177                          'iface_self_checkout', 'iface_led', 'iface_cashdrawer',
 178                          'iface_payment_terminal', 'iface_electronic_scale', 'iface_barscan',
 179                          'iface_vkeyboard','iface_print_via_proxy','iface_scan_via_proxy',
 180                          'iface_cashdrawer','iface_invoicing','iface_big_scrollbars',
 181                          'receipt_header','receipt_footer','proxy_ip',
 182                          'state','sequence_id','session_ids'],
 183                         [['id','=', self.pos_session.config_id[0]]]
 184                     );
 185                 }).then(function(configs){
 186                     self.config = configs[0];
 187                     self.config.use_proxy = self.config.iface_payment_terminal ||
 188                                             self.config.iface_electronic_scale ||
 189                                             self.config.iface_print_via_proxy  ||
 190                                             self.config.iface_scan_via_proxy   ||
 191                                             self.config.iface_cashdrawer;
 192
 193                     return self.fetch('product.pricelist',['currency_id'],[['id','=',self.config.pricelist_id[0]]]);
 194                 }).then(function(pricelists){
 195                     self.pricelist = pricelists[0];
 196
 197                     return self.fetch('res.currency',['symbol','position','rounding','accuracy'],[['id','=',self.pricelist.currency_id[0]]]);
 198                 }).then(function(currencies){
 199                     self.currency = currencies[0];
 200
 201                     /*
 202                     return (new instance.web.Model('decimal.precision')).call('get_precision',[['Account']]);
 203                 }).then(function(precision){
 204                     self.accounting_precision = precision;
 205                     console.log("PRECISION",precision);
 206 */
 207                     return self.fetch('product.packaging',['ean','product_tmpl_id']);
 208                 }).then(function(packagings){
 209                     self.db.add_packagings(packagings);
 210
 211                     return self.fetch('pos.category', ['id','name','parent_id','child_id','image']);
 212                 }).then(function(categories){
 213                     self.db.add_categories(categories);
 214
 215                     return self.fetch(
 216                         'product.product',
 217                         ['name', 'list_price','price','pos_categ_id', 'taxes_id', 'ean13', 'default_code', 'variants',
 218                          'to_weight', 'uom_id', 'uos_id', 'uos_coeff', 'mes_type', 'description_sale', 'description',
 219                          'product_tmpl_id'],
 220                         [['sale_ok','=',true],['available_in_pos','=',true]],
 221                         {pricelist: self.pricelist.id} // context for price
 222                     );
 223                 }).then(function(products){
 224                     self.db.add_products(products);
 225
 226                     return self.fetch(
 227                         'account.bank.statement',
 228                         ['account_id','currency','journal_id','state','name','user_id','pos_session_id'],
 229                         [['state','=','open'],['pos_session_id', '=', self.pos_session.id]]
 230                     );
 231                 }).then(function(bankstatements){
 232                     var journals = [];
 233                     _.each(bankstatements,function(statement) {
 234                         journals.push(statement.journal_id[0]);
 235                     });
 236                     self.bankstatements = bankstatements;
 237                     return self.fetch('account.journal', undefined, [['id','in', journals]]);
 238                 }).then(function(journals){
 239                     self.journals = journals;
 240
 241                     // associate the bank statements with their journals.
 242                     var bankstatements = self.bankstatements;
 243                     for(var i = 0, ilen = bankstatements.length; i < ilen; i++){
 244                         for(var j = 0, jlen = journals.length; j < jlen; j++){
 245                             if(bankstatements[i].journal_id[0] === journals[j].id){
 246                                 bankstatements[i].journal = journals[j];
 247                                 bankstatements[i].self_checkout_payment_method = journals[j].self_checkout_payment_method;
 248                             }
 249                         }
 250                     }
 251                     self.cashregisters = bankstatements;
 252
 253                     // Load the company Logo
 254
 255                     self.company_logo = new Image();
 256                     self.company_logo.crossOrigin = 'anonymous';
 257                     var  logo_loaded = new $.Deferred();
 258                     self.company_logo.onload = function(){
 259                         var img = self.company_logo;
 260                         var ratio = 1;
 261                         var targetwidth = 300;
 262                         var maxheight = 150;
 263                         if( img.width !== targetwidth ){
 264                             ratio = targetwidth / img.width;
 265                         }
 266                         if( img.height * ratio > maxheight ){
 267                             ratio = maxheight / img.height;
 268                         }
 269                         var width  = Math.floor(img.width * ratio);
 270                         var height = Math.floor(img.height * ratio);
 271                         var c = document.createElement('canvas');
 272                             c.width  = width;
 273                             c.height = height
 274                         var ctx = c.getContext('2d');
 275                             ctx.drawImage(self.company_logo,0,0, width, height);
 276
 277                         self.company_logo_base64 = c.toDataURL();
 278                         window.logo64 = self.company_logo_base64;
 279                         logo_loaded.resolve();
 280                     };
 281                     self.company_logo.onerror = function(){
 282                         logo_loaded.reject();
 283                     };
 284                     self.company_logo.src = window.location.origin + '/web/binary/company_logo';
 285
 286                     return logo_loaded;
 287                 });
 288
 289             return loaded;
 290         },
 291
 292         // this is called when an order is removed from the order collection. It ensures that there is always an existing
 293         // order and a valid selected order
 294         on_removed_order: function(removed_order,index,reason){
 295             if(reason === 'abandon' && this.get('orders').size() > 0){
 296                 // when we intentionally remove an unfinished order, and there is another existing one
 297                 this.set({'selectedOrder' : this.get('orders').at(index) || this.get('orders').last()});
 298             }else{
 299                 // when the order was automatically removed after completion,
 300                 // or when we intentionally delete the only concurrent order
 301                 this.add_new_order();
 302             }
 303         },
 304
 305         //creates a new empty order and sets it as the current order
 306         add_new_order: function(){
 307             var order = new module.Order({pos:this});
 308             this.get('orders').add(order);
 309             this.set('selectedOrder', order);
 310         },
 311
 312         //removes the current order
 313         delete_current_order: function(){
 314             this.get('selectedOrder').destroy({'reason':'abandon'});
 315         },
 316
 317         // saves the order locally and try to send it to the backend.
 318         // it returns a deferred that succeeds after having tried to send the order and all the other pending orders.
 319         push_order: function(order) {
 320             var self = this;
 321             this.proxy.log('push_order',order.export_as_JSON());
 322             var order_id = this.db.add_order(order.export_as_JSON());
 323             var pushed = new $.Deferred();
 324
 325             this.set('synch',{state:'connecting', pending:self.db.get_orders().length});
 326
 327             this.flush_mutex.exec(function(){
 328                 var flushed = self._flush_all_orders();
 329
 330                 flushed.always(function(){
 331                     pushed.resolve();
 332                 });
 333
 334                 return flushed;
 335             });
 336             return pushed;
 337         },
 338
 339         // saves the order locally and try to send it to the backend and make an invoice
 340         // returns a deferred that succeeds when the order has been posted and successfully generated
 341         // an invoice. This method can fail in various ways:
 342         // error-no-client: the order must have an associated partner_id. You can retry to make an invoice once
 343         //     this error is solved
 344         // error-transfer: there was a connection error during the transfer. You can retry to make the invoice once
 345         //     the network connection is up
 346
 347         push_and_invoice_order: function(order){
 348             var self = this;
 349             var invoiced = new $.Deferred();
 350
 351             if(!order.get_client()){
 352                 invoiced.reject('error-no-client');
 353                 return invoiced;
 354             }
 355
 356             var order_id = this.db.add_order(order.export_as_JSON());
 357
 358             this.set('synch',{state:'connecting', pending:self.db.get_orders().length});
 359
 360             this.flush_mutex.exec(function(){
 361                 var done = new $.Deferred(); // holds the mutex
 362
 363                 // send the order to the server
 364                 // we have a 30 seconds timeout on this push.
 365                 // FIXME: if the server takes more than 30 seconds to accept the order,
 366                 // the client will believe it wasn't successfully sent, and very bad
 367                 // things will happen as a duplicate will be sent next time
 368                 // so we must make sure the server detects and ignores duplicated orders
 369
 370                 var transfer = self._flush_order(order_id, {timeout:30000, to_invoice:true});
 371
 372                 transfer.fail(function(){
 373                     invoiced.reject('error-transfer');
 374                     done.reject();
 375                 });
 376
 377                 // on success, get the order id generated by the server
 378                 transfer.pipe(function(order_server_id){
 379                     // generate the pdf and download it
 380                     self.pos_widget.do_action('point_of_sale.pos_invoice_report',{additional_context:{
 381                         active_ids:order_server_id,
 382                     }});
 383                     invoiced.resolve();
 384                     done.resolve();
 385                 });
 386
 387                 return done;
 388
 389             });
 390
 391             return invoiced;
 392         },
 393
 394         // attemps to send all pending orders ( stored in the pos_db ) to the server,
 395         // and remove the successfully sent ones from the db once
 396         // it has been confirmed that they have been sent correctly.
 397         flush: function() {
 398             var self = this;
 399             var flushed = new $.Deferred();
 400
 401             this.flush_mutex.exec(function(){
 402                 var done = new $.Deferred();
 403
 404                 self._flush_all_orders()
 405                     .done(  function(){ flushed.resolve();})
 406                     .fail(  function(){ flushed.reject(); })
 407                     .always(function(){ done.resolve();   });
 408
 409                 return done;
 410             });
 411
 412             return flushed;
 413         },
 414
 415         // attempts to send the locally stored order of id 'order_id'
 416         // the sending is asynchronous and can take some time to decide if it is successful or not
 417         // it is therefore important to only call this method from inside a mutex
 418         // this method returns a deferred indicating wether the sending was successful or not
 419         // there is a timeout parameter which is set to 2 seconds by default.
 420         _flush_order: function( order_id, options) {
 421             return this._flush_all_orders([this.db.get_order(order_id)], options);
 422         },
 423
 424         // attempts to send all the locally stored orders. As with _flush_order, it should only be
 425         // called from within a mutex.
 426         // this method returns a deferred that always succeeds when all orders have been tried to be sent,
 427         // even if none of them could actually be sent.
 428         _flush_all_orders: function () {
 429             var self = this;
 430             self.set('synch', {
 431                 state: 'connecting',
 432                 pending: self.get('synch').pending
 433             });
 434             return self._save_to_server(self.db.get_orders()).done(function () {
 435                 var pending = self.db.get_orders().length;
 436                 self.set('synch', {
 437                     state: pending ? 'connecting' : 'connected',
 438                     pending: pending
 439                 });
 440             });
 441         },
 442
 443         // send an array of orders to the server
 444         // available options:
 445         // - timeout: timeout for the rpc call in ms
 446         _save_to_server: function (orders, options) {
 447             if (!orders || !orders.length) {
 448                 var result = $.Deferred();
 449                 result.resolve();
 450                 return result;
 451             }
 452
 453             options = options || {};
 454
 455             var self = this;
 456             var timeout = typeof options.timeout === 'number' ? options.timeout : 7500 * orders.length;
 457
 458             // we try to send the order. shadow prevents a spinner if it takes too long. (unless we are sending an invoice,
 459             // then we want to notify the user that we are waiting on something )
 460             var posOrderModel = new instance.web.Model('pos.order');
 461             return posOrderModel.call('create_from_ui',
 462                 [_.map(orders, function (order) {
 463                     order.to_invoice = options.to_invoice || false;
 464                     return order;
 465                 })],
 466                 undefined,
 467                 {
 468                     shadow: !options.to_invoice,
 469                     timeout: timeout
 470                 }
 471             ).then(function () {
 472                 _.each(orders, function (order) {
 473                     self.db.remove_order(order.id);
 474                 });
 475             }).fail(function (unused, event){
 476                 // prevent an error popup creation by the rpc failure
 477                 // we want the failure to be silent as we send the orders in the background
 478                 event.preventDefault();
 479                 console.error('Failed to send orders:', orders);
 480             });
 481         },
 482
 483         scan_product: function(parsed_code){
 484             var self = this;
 485             var selectedOrder = this.get('selectedOrder');
 486             if(parsed_code.encoding === 'ean13'){
 487                 var product = this.db.get_product_by_ean13(parsed_code.base_code);
 488             }else if(parsed_code.encoding === 'reference'){
 489                 var product = this.db.get_product_by_reference(parsed_code.code);
 490             }
 491
 492             if(!product){
 493                 return false;
 494             }
 495
 496             if(parsed_code.type === 'price'){
 497                 selectedOrder.addProduct(product, {price:parsed_code.value});
 498             }else if(parsed_code.type === 'weight'){
 499                 selectedOrder.addProduct(product, {quantity:parsed_code.value, merge:false});
 500             }else{
 501                 selectedOrder.addProduct(product);
 502             }
 503             return true;
 504         },
 505     });
 506
 507     // An orderline represent one element of the content of a client's shopping cart.
 508     // An orderline contains a product, its quantity, its price, discount. etc.
 509     // An Order contains zero or more Orderlines.
 510     module.Orderline = Backbone.Model.extend({
 511         initialize: function(attr,options){
 512             this.pos = options.pos;
 513             this.order = options.order;
 514             this.product = options.product;
 515             this.price   = options.product.price;
 516             this.quantity = 1;
 517             this.quantityStr = '1';
 518             this.discount = 0;
 519             this.discountStr = '0';
 520             this.type = 'unit';
 521             this.selected = false;
 522         },
 523         // sets a discount [0,100]%
 524         set_discount: function(discount){
 525             var disc = Math.min(Math.max(parseFloat(discount) || 0, 0),100);
 526             this.discount = disc;
 527             this.discountStr = '' + disc;
 528             this.trigger('change',this);
 529         },
 530         // returns the discount [0,100]%
 531         get_discount: function(){
 532             return this.discount;
 533         },
 534         get_discount_str: function(){
 535             return this.discountStr;
 536         },
 537         get_product_type: function(){
 538             return this.type;
 539         },
 540         // sets the quantity of the product. The quantity will be rounded according to the
 541         // product's unity of measure properties. Quantities greater than zero will not get
 542         // rounded to zero
 543         set_quantity: function(quantity){
 544             if(quantity === 'remove'){
 545                 this.order.removeOrderline(this);
 546                 return;
 547             }else{
 548                 var quant = parseFloat(quantity) || 0;
 549                 var unit = this.get_unit();
 550                 if(unit){
 551                     this.quantity    = round_pr(quant, unit.rounding);
 552                     this.quantityStr = this.quantity.toFixed(Math.ceil(Math.log(1.0 / unit.rounding) / Math.log(10)));
 553                 }else{
 554                     this.quantity    = quant;
 555                     this.quantityStr = '' + this.quantity;
 556                 }
 557             }
 558             this.trigger('change',this);
 559         },
 560         // return the quantity of product
 561         get_quantity: function(){
 562             return this.quantity;
 563         },
 564         get_quantity_str: function(){
 565             return this.quantityStr;
 566         },
 567         get_quantity_str_with_unit: function(){
 568             var unit = this.get_unit();
 569             if(unit && unit.name !== 'Unit(s)'){
 570                 return this.quantityStr + ' ' + unit.name;
 571             }else{
 572                 return this.quantityStr;
 573             }
 574         },
 575         // return the unit of measure of the product
 576         get_unit: function(){
 577             var unit_id = (this.product.uos_id || this.product.uom_id);
 578             if(!unit_id){
 579                 return undefined;
 580             }
 581             unit_id = unit_id[0];
 582             if(!this.pos){
 583                 return undefined;
 584             }
 585             return this.pos.units_by_id[unit_id];
 586         },
 587         // return the product of this orderline
 588         get_product: function(){
 589             return this.product;
 590         },
 591         // selects or deselects this orderline
 592         set_selected: function(selected){
 593             this.selected = selected;
 594             this.trigger('change',this);
 595         },
 596         // returns true if this orderline is selected
 597         is_selected: function(){
 598             return this.selected;
 599         },
 600         // when we add an new orderline we want to merge it with the last line to see reduce the number of items
 601         // in the orderline. This returns true if it makes sense to merge the two
 602         can_be_merged_with: function(orderline){
 603             if( this.get_product().id !== orderline.get_product().id){    //only orderline of the same product can be merged
 604                 return false;
 605             }else if(this.get_product_type() !== orderline.get_product_type()){
 606                 return false;
 607             }else if(this.get_discount() > 0){             // we don't merge discounted orderlines
 608                 return false;
 609             }else if(this.price !== orderline.price){
 610                 return false;
 611             }else{
 612                 return true;
 613             }
 614         },
 615         merge: function(orderline){
 616             this.set_quantity(this.get_quantity() + orderline.get_quantity());
 617         },
 618         export_as_JSON: function() {
 619             return {
 620                 qty: this.get_quantity(),
 621                 price_unit: this.get_unit_price(),
 622                 discount: this.get_discount(),
 623                 product_id: this.get_product().id,
 624             };
 625         },
 626         //used to create a json of the ticket, to be sent to the printer
 627         export_for_printing: function(){
 628             return {
 629                 quantity:           this.get_quantity(),
 630                 unit_name:          this.get_unit().name,
 631                 price:              this.get_unit_price(),
 632                 discount:           this.get_discount(),
 633                 product_name:       this.get_product().name,
 634                 price_display :     this.get_display_price(),
 635                 price_with_tax :    this.get_price_with_tax(),
 636                 price_without_tax:  this.get_price_without_tax(),
 637                 tax:                this.get_tax(),
 638                 product_description:      this.get_product().description,
 639                 product_description_sale: this.get_product().description_sale,
 640             };
 641         },
 642         // changes the base price of the product for this orderline
 643         set_unit_price: function(price){
 644             this.price = round_di(parseFloat(price) || 0, 2);
 645             this.trigger('change',this);
 646         },
 647         get_unit_price: function(){
 648             var rounding = this.pos.currency.rounding;
 649             return round_pr(this.price,rounding);
 650         },
 651         get_display_price: function(){
 652             var rounding = this.pos.currency.rounding;
 653             return  round_pr(round_pr(this.get_unit_price() * this.get_quantity(),rounding) * (1- this.get_discount()/100.0),rounding);
 654         },
 655         get_price_without_tax: function(){
 656             return this.get_all_prices().priceWithoutTax;
 657         },
 658         get_price_with_tax: function(){
 659             return this.get_all_prices().priceWithTax;
 660         },
 661         get_tax: function(){
 662             return this.get_all_prices().tax;
 663         },
 664         get_tax_details: function(){
 665             return this.get_all_prices().taxDetails;
 666         },
 667         get_all_prices: function(){
 668             var self = this;
 669             var currency_rounding = this.pos.currency.rounding;
 670             var base = round_pr(this.get_quantity() * this.get_unit_price() * (1.0 - (this.get_discount() / 100.0)), currency_rounding);
 671             var totalTax = base;
 672             var totalNoTax = base;
 673
 674             var product =  this.get_product();
 675             var taxes_ids = product.taxes_id;
 676             var taxes =  self.pos.taxes;
 677             var taxtotal = 0;
 678             var taxdetail = {};
 679             _.each(taxes_ids, function(el) {
 680                 var tax = _.detect(taxes, function(t) {return t.id === el;});
 681                 if (tax.price_include) {
 682                     var tmp;
 683                     if (tax.type === "percent") {
 684                         tmp =  base - round_pr(base / (1 + tax.amount),currency_rounding);
 685                     } else if (tax.type === "fixed") {
 686                         tmp = round_pr(tax.amount * self.get_quantity(),currency_rounding);
 687                     } else {
 688                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 689                     }
 690                     tmp = round_pr(tmp,currency_rounding);
 691                     taxtotal += tmp;
 692                     totalNoTax -= tmp;
 693                     taxdetail[tax.id] = tmp;
 694                 } else {
 695                     var tmp;
 696                     if (tax.type === "percent") {
 697                         tmp = tax.amount * base;
 698                     } else if (tax.type === "fixed") {
 699                         tmp = tax.amount * self.get_quantity();
 700                     } else {
 701                         throw "This type of tax is not supported by the point of sale: " + tax.type;
 702                     }
 703                     tmp = round_pr(tmp,currency_rounding);
 704                     taxtotal += tmp;
 705                     totalTax += tmp;
 706                     taxdetail[tax.id] = tmp;
 707                 }
 708             });
 709             return {
 710                 "priceWithTax": totalTax,
 711                 "priceWithoutTax": totalNoTax,
 712                 "tax": taxtotal,
 713                 "taxDetails": taxdetail,
 714             };
 715         },
 716     });
 717
 718     module.OrderlineCollection = Backbone.Collection.extend({
 719         model: module.Orderline,
 720     });
 721
 722     // Every Paymentline contains a cashregister and an amount of money.
 723     module.Paymentline = Backbone.Model.extend({
 724         initialize: function(attributes, options) {
 725             this.amount = 0;
 726             this.cashregister = options.cashregister;
 727             this.name = this.cashregister.journal_id[1];
 728             this.selected = false;
 729         },
 730         //sets the amount of money on this payment line
 731         set_amount: function(value){
 732             this.amount = round_di(parseFloat(value) || 0, 2);
 733             this.trigger('change:amount',this);
 734         },
 735         // returns the amount of money on this paymentline
 736         get_amount: function(){
 737             return this.amount;
 738         },
 739         set_selected: function(selected){
 740             if(this.selected !== selected){
 741                 this.selected = selected;
 742                 this.trigger('change:selected',this);
 743             }
 744         },
 745         // returns the associated cashregister
 746         //exports as JSON for server communication
 747         export_as_JSON: function(){
 748             return {
 749                 name: instance.web.datetime_to_str(new Date()),
 750                 statement_id: this.cashregister.id,
 751                 account_id: this.cashregister.account_id[0],
 752                 journal_id: this.cashregister.journal_id[0],
 753                 amount: this.get_amount()
 754             };
 755         },
 756         //exports as JSON for receipt printing
 757         export_for_printing: function(){
 758             return {
 759                 amount: this.get_amount(),
 760                 journal: this.cashregister.journal_id[1],
 761             };
 762         },
 763     });
 764
 765     module.PaymentlineCollection = Backbone.Collection.extend({
 766         model: module.Paymentline,
 767     });
 768
 769
 770     // An order more or less represents the content of a client's shopping cart (the OrderLines)
 771     // plus the associated payment information (the Paymentlines)
 772     // there is always an active ('selected') order in the Pos, a new one is created
 773     // automaticaly once an order is completed and sent to the server.
 774     module.Order = Backbone.Model.extend({
 775         initialize: function(attributes){
 776             Backbone.Model.prototype.initialize.apply(this, arguments);
 777             this.uid =     this.generateUniqueId();
 778             this.set({
 779                 creationDate:   new Date(),
 780                 orderLines:     new module.OrderlineCollection(),
 781                 paymentLines:   new module.PaymentlineCollection(),
 782                 name:           "Order " + this.uid,
 783                 client:         null,
 784             });
 785             this.pos = attributes.pos;
 786             this.selected_orderline   = undefined;
 787             this.selected_paymentline = undefined;
 788             this.screen_data = {};  // see ScreenSelector
 789             this.receipt_type = 'receipt';  // 'receipt' || 'invoice'
 790             return this;
 791         },
 792         generateUniqueId: function() {
 793             return new Date().getTime();
 794         },
 795         addProduct: function(product, options){
 796             options = options || {};
 797             var attr = JSON.parse(JSON.stringify(product));
 798             attr.pos = this.pos;
 799             attr.order = this;
 800             var line = new module.Orderline({}, {pos: this.pos, order: this, product: product});
 801
 802             if(options.quantity !== undefined){
 803                 line.set_quantity(options.quantity);
 804             }
 805             if(options.price !== undefined){
 806                 line.set_unit_price(options.price);
 807             }
 808
 809             var last_orderline = this.getLastOrderline();
 810             if( last_orderline && last_orderline.can_be_merged_with(line) && options.merge !== false){
 811                 last_orderline.merge(line);
 812             }else{
 813                 this.get('orderLines').add(line);
 814             }
 815             this.selectLine(this.getLastOrderline());
 816         },
 817         removeOrderline: function( line ){
 818             this.get('orderLines').remove(line);
 819             this.selectLine(this.getLastOrderline());
 820         },
 821         getLastOrderline: function(){
 822             return this.get('orderLines').at(this.get('orderLines').length -1);
 823         },
 824         addPaymentline: function(cashregister) {
 825             var paymentLines = this.get('paymentLines');
 826             var newPaymentline = new module.Paymentline({},{cashregister:cashregister});
 827             if(cashregister.journal.type !== 'cash'){
 828                 newPaymentline.set_amount( Math.max(this.getDueLeft(),0) );
 829             }
 830             paymentLines.add(newPaymentline);
 831             this.selectPaymentline(newPaymentline);
 832
 833         },
 834         removePaymentline: function(line){
 835             if(this.selected_paymentline === line){
 836                 this.selectPaymentline(undefined);
 837             }
 838             this.get('paymentLines').remove(line);
 839         },
 840         getName: function() {
 841             return this.get('name');
 842         },
 843         getSubtotal : function(){
 844             return (this.get('orderLines')).reduce((function(sum, orderLine){
 845                 return sum + orderLine.get_display_price();
 846             }), 0);
 847         },
 848         getTotalTaxIncluded: function() {
 849             return (this.get('orderLines')).reduce((function(sum, orderLine) {
 850                 return sum + orderLine.get_price_with_tax();
 851             }), 0);
 852         },
 853         getDiscountTotal: function() {
 854             return (this.get('orderLines')).reduce((function(sum, orderLine) {
 855                 return sum + (orderLine.get_unit_price() * (orderLine.get_discount()/100) * orderLine.get_quantity());
 856             }), 0);
 857         },
 858         getTotalTaxExcluded: function() {
 859             return (this.get('orderLines')).reduce((function(sum, orderLine) {
 860                 return sum + orderLine.get_price_without_tax();
 861             }), 0);
 862         },
 863         getTax: function() {
 864             return (this.get('orderLines')).reduce((function(sum, orderLine) {
 865                 return sum + orderLine.get_tax();
 866             }), 0);
 867         },
 868         getTaxDetails: function(){
 869             var details = {};
 870             var fulldetails = [];
 871             var taxes_by_id = {};
 872
 873             for(var i = 0; i < this.pos.taxes.length; i++){
 874                 taxes_by_id[this.pos.taxes[i].id] = this.pos.taxes[i];
 875             }
 876
 877             this.get('orderLines').each(function(line){
 878                 var ldetails = line.get_tax_details();
 879                 for(var id in ldetails){
 880                     if(ldetails.hasOwnProperty(id)){
 881                         details[id] = (details[id] || 0) + ldetails[id];
 882                     }
 883                 }
 884             });
 885
 886             for(var id in details){
 887                 if(details.hasOwnProperty(id)){
 888                     fulldetails.push({amount: details[id], tax: taxes_by_id[id]});
 889                 }
 890             }
 891
 892             return fulldetails;
 893         },
 894         getPaidTotal: function() {
 895             return (this.get('paymentLines')).reduce((function(sum, paymentLine) {
 896                 return sum + paymentLine.get_amount();
 897             }), 0);
 898         },
 899         getChange: function() {
 900             return this.getPaidTotal() - this.getTotalTaxIncluded();
 901         },
 902         getDueLeft: function() {
 903             return this.getTotalTaxIncluded() - this.getPaidTotal();
 904         },
 905         // sets the type of receipt 'receipt'(default) or 'invoice'
 906         set_receipt_type: function(type){
 907             this.receipt_type = type;
 908         },
 909         get_receipt_type: function(){
 910             return this.receipt_type;
 911         },
 912         // the client related to the current order.
 913         set_client: function(client){
 914             this.set('client',client);
 915         },
 916         get_client: function(){
 917             return this.get('client');
 918         },
 919         get_client_name: function(){
 920             var client = this.get('client');
 921             return client ? client.name : "";
 922         },
 923         // the order also stores the screen status, as the PoS supports
 924         // different active screens per order. This method is used to
 925         // store the screen status.
 926         set_screen_data: function(key,value){
 927             if(arguments.length === 2){
 928                 this.screen_data[key] = value;
 929             }else if(arguments.length === 1){
 930                 for(key in arguments[0]){
 931                     this.screen_data[key] = arguments[0][key];
 932                 }
 933             }
 934         },
 935         //see set_screen_data
 936         get_screen_data: function(key){
 937             return this.screen_data[key];
 938         },
 939         // exports a JSON for receipt printing
 940         export_for_printing: function(){
 941             var orderlines = [];
 942             this.get('orderLines').each(function(orderline){
 943                 orderlines.push(orderline.export_for_printing());
 944             });
 945
 946             var paymentlines = [];
 947             this.get('paymentLines').each(function(paymentline){
 948                 paymentlines.push(paymentline.export_for_printing());
 949             });
 950             var client  = this.get('client');
 951             var cashier = this.pos.cashier || this.pos.user;
 952             var company = this.pos.company;
 953             var date = new Date();
 954
 955             return {
 956                 orderlines: orderlines,
 957                 paymentlines: paymentlines,
 958                 subtotal: this.getSubtotal(),
 959                 total_with_tax: this.getTotalTaxIncluded(),
 960                 total_without_tax: this.getTotalTaxExcluded(),
 961                 total_tax: this.getTax(),
 962                 total_paid: this.getPaidTotal(),
 963                 total_discount: this.getDiscountTotal(),
 964                 tax_details: this.getTaxDetails(),
 965                 change: this.getChange(),
 966                 name : this.getName(),
 967                 client: client ? client.name : null ,
 968                 invoice_id: null,   //TODO
 969                 cashier: cashier ? cashier.name : null,
 970                 header: this.pos.config.receipt_header || '',
 971                 footer: this.pos.config.receipt_footer || '',
 972                 precision: {
 973                     price: 2,
 974                     money: 2,
 975                     quantity: 3,
 976                 },
 977                 date: {
 978                     year: date.getFullYear(),
 979                     month: date.getMonth(),
 980                     date: date.getDate(),       // day of the month
 981                     day: date.getDay(),         // day of the week
 982                     hour: date.getHours(),
 983                     minute: date.getMinutes() ,
 984                     isostring: date.toISOString(),
 985                     localestring: date.toLocaleString(),
 986                 },
 987                 company:{
 988                     email: company.email,
 989                     website: company.website,
 990                     company_registry: company.company_registry,
 991                     contact_address: company.partner_id[1],
 992                     vat: company.vat,
 993                     name: company.name,
 994                     phone: company.phone,
 995                     logo:  this.pos.company_logo_base64,
 996                 },
 997                 currency: this.pos.currency,
 998             };
 999         },
1000         export_as_JSON: function() {
1001             var orderLines, paymentLines;
1002             orderLines = [];
1003             (this.get('orderLines')).each(_.bind( function(item) {
1004                 return orderLines.push([0, 0, item.export_as_JSON()]);
1005             }, this));
1006             paymentLines = [];
1007             (this.get('paymentLines')).each(_.bind( function(item) {
1008                 return paymentLines.push([0, 0, item.export_as_JSON()]);
1009             }, this));
1010             return {
1011                 name: this.getName(),
1012                 amount_paid: this.getPaidTotal(),
1013                 amount_total: this.getTotalTaxIncluded(),
1014                 amount_tax: this.getTax(),
1015                 amount_return: this.getChange(),
1016                 lines: orderLines,
1017                 statement_ids: paymentLines,
1018                 pos_session_id: this.pos.pos_session.id,
1019                 partner_id: this.get_client() ? this.get_client().id : false,
1020                 user_id: this.pos.cashier ? this.pos.cashier.id : this.pos.user.id,
1021                 uid: this.uid,
1022             };
1023         },
1024         getSelectedLine: function(){
1025             return this.selected_orderline;
1026         },
1027         selectLine: function(line){
1028             if(line){
1029                 if(line !== this.selected_orderline){
1030                     if(this.selected_orderline){
1031                         this.selected_orderline.set_selected(false);
1032                     }
1033                     this.selected_orderline = line;
1034                     this.selected_orderline.set_selected(true);
1035                 }
1036             }else{
1037                 this.selected_orderline = undefined;
1038             }
1039         },
1040         deselectLine: function(){
1041             if(this.selected_orderline){
1042                 this.selected_orderline.set_selected(false);
1043                 this.selected_orderline = undefined;
1044             }
1045         },
1046         selectPaymentline: function(line){
1047             if(line !== this.selected_paymentline){
1048                 if(this.selected_paymentline){
1049                     this.selected_paymentline.set_selected(false);
1050                 }
1051                 this.selected_paymentline = line;
1052                 if(this.selected_paymentline){
1053                     this.selected_paymentline.set_selected(true);
1054                 }
1055                 this.trigger('change:selected_paymentline',this.selected_paymentline);
1056             }
1057         },
1058     });
1059
1060     module.OrderCollection = Backbone.Collection.extend({
1061         model: module.Order,
1062     });
1063
1064     /*
1065      The numpad handles both the choice of the property currently being modified
1066      (quantity, price or discount) and the edition of the corresponding numeric value.
1067      */
1068     module.NumpadState = Backbone.Model.extend({
1069         defaults: {
1070             buffer: "0",
1071             mode: "quantity"
1072         },
1073         appendNewChar: function(newChar) {
1074             var oldBuffer;
1075             oldBuffer = this.get('buffer');
1076             if (oldBuffer === '0') {
1077                 this.set({
1078                     buffer: newChar
1079                 });
1080             } else if (oldBuffer === '-0') {
1081                 this.set({
1082                     buffer: "-" + newChar
1083                 });
1084             } else {
1085                 this.set({
1086                     buffer: (this.get('buffer')) + newChar
1087                 });
1088             }
1089             this.trigger('set_value',this.get('buffer'));
1090         },
1091         deleteLastChar: function() {
1092             if(this.get('buffer') === ""){
1093                 if(this.get('mode') === 'quantity'){
1094                     this.trigger('set_value','remove');
1095                 }else{
1096                     this.trigger('set_value',this.get('buffer'));
1097                 }
1098             }else{
1099                 var newBuffer = this.get('buffer').slice(0,-1) || "";
1100                 this.set({ buffer: newBuffer });
1101                 this.trigger('set_value',this.get('buffer'));
1102             }
1103         },
1104         switchSign: function() {
1105             console.log('switchsing');
1106             var oldBuffer;
1107             oldBuffer = this.get('buffer');
1108             this.set({
1109                 buffer: oldBuffer[0] === '-' ? oldBuffer.substr(1) : "-" + oldBuffer
1110             });
1111             this.trigger('set_value',this.get('buffer'));
1112         },
1113         changeMode: function(newMode) {
1114             this.set({
1115                 buffer: "0",
1116                 mode: newMode
1117             });
1118         },
1119         reset: function() {
1120             this.set({
1121                 buffer: "0",
1122                 mode: "quantity"
1123             });
1124         },
1125         resetValue: function(){
1126             this.set({buffer:'0'});
1127         },
1128     });
1129 }