(function () {
    var instance = openerp
    openerp.print_engine = {}
    
    /**
     * 
     */
    instance.print_engine.SocketManager = instance.web.Class.extend({
        init: function () {
            this.socket = null;
            this.state = 'offline';
            this.attemps = 0;

            this.start();
        },
        start: function () {
            var self = this;
            this.getSockets().then(function () {
                self.connect();
            });
        },
        getSockets: function () {
            var defer = $.Deferred();
            var self = this;

            $.get('/print_engine/sockets').done(function (data) {
                self.sockets = data.sockets;
                defer.resolve(data.sockets);
            }).fail(function (error){
                defer.reject(error);
            });

            return defer;
        },
        urlize: function (info) {
            return info.protocol + '://' + info.host + ':' + info.port + info.path;
        },
        connect: function () {
            if (this.sockets.length === 0) {
                return
            }

            var self = this;
            var url = this.urlize(this.sockets[0]);

            if (this.socket) {
                this.socket = null;
            }
            
            try {
                this.socket = new WebSocket(url);

                this.socket.onopen = function (e) {
                    self.handleOpen(e);
                };
                this.socket.onclose = function (e) {
                    self.handleClose(e);
                };
                this.socket.onerror = function (e) {
                    self.handleError(e);
                };
                this.socket.onmessage = function (e) {
                    self.handleMessage(e);
                };
            } catch(e) {
                // Ignore this error
            }
        },
        reconnect: function () {
            this.state = 'reconnecting';

            $('#printer-status').removeClass();
            $('#printer-status').addClass('printer-status-reconnect');

            var self = this;

            if (this.attemps === 3) {
                this.state = 'offline';

                $('#printer-status').removeClass();
                $('#printer-status').addClass('printer-status-offline');

                return;
            }

            setTimeout(function () {
                self.connect();

                self.attemps = self.attemps + 1;
            }, 3000);
        },
        handleOpen: function (e) {
            this.state = 'online';

            $('#printer-status').removeClass();
            $('#printer-status').addClass('printer-status-online');
        },
        handleClose: function (e) {
            this.reconnect();
        },
        handleMessage: function (e) {
            var obj = JSON.parse(e.data);

            if (obj.printers) {
                this.sendToServer('/print_engine/update', e.data).then(function () {
                    instance.client.action_manager.inner_widget.views['form'].controller.reload();
                    instance.web.notification.do_notify('Información', 'Impresoras actualizadas con éxito');
                });
            }
        },
        handleError: function (e) {
            // Ignore this error
        },
        sendToSocket: function (data) {
            if (this.state !== 'online') {
                return;
            }

            if (!data) {
                return;
            }

            this.socket.send(JSON.stringify(data));
        },
        sendToServer: function (url, data) {
            var defer = $.Deferred();

            var json = {
                jsonrpc: '2.0',
                method: 'call',
                params: {
                    data: data
                }
            }

            $.ajax({
                type: 'POST',
                url: url,
                dataType: 'json',
                data: JSON.stringify(json),
                beforeSend: function(xhr) {
                    xhr.setRequestHeader('Content-Type', 'application/json');
                },
                success: function (ok) {
                    defer.resolve(ok);
                },
            });

            return defer;
        },
        discoveryPrinters: function () {
            var commands = {
                action: 'list'
            }

            this.sendToSocket(commands);
        },
        print(printer, data) {
            if (this.state !== 'online') {
                instance.web.notification.do_warn('Atención', 'La impresora está fuera de servicio');
                return;
            }

            if (!printer) {
                instance.web.notification.do_warn('Atención', 'La impresora no se encuentra');
                return;
            }

            if (!data) {
                instance.web.notification.do_warn('Atención', 'No se encuentran datos para imprimir');
                return;
            }

            var commands = {
                action: 'print',
                printer: printer,
                data: data
            }

            this.sendToSocket(commands)
        }
    });

    /**
     * 
     */
    instance.print_engine.PrinterTopWidget = instance.web.Widget.extend({
        template: 'printEngine.PrinterTopWidget',
        init: function (parent) {
            this._super(parent)
        },
        start: function () {
            this.$el.click(this, this.selectDefaultPrinter);
        },
        selectDefaultPrinter: function (e) {
            e.preventDefault();
            var self = e.data;

            instance.client.action_manager.do_action({
                context: self.session.user_context,
                name: 'Impresora por defecto',
                type: 'ir.actions.act_window',
                res_model: 'print.engine.printer',
                views: [[false, 'list'], [false, 'form']],
                domain : [['socket_id.user_id', '=', self.session.user_context.uid]],
                target: 'new',
                flags: {
                    action_buttons: true
                }
            })
        }
    })

    /**
     * 
     * 
     */
    instance.print_engine.ping = function () {
        if (!instance.print_engine.socket_manager) {
            return;
        }

        instance.web.notification.do_notify('Información', 'Pong')
    }
    
    /**
     * 
     */
    instance.print_engine.discovery_printers = function (element, action) {
        if (!instance.print_engine.socket_manager) {
            return;
        }

        if(!confirm('Ésta acción quitará la impresora por defecto')) {
            return;
        }

        instance.print_engine.socket_manager.discoveryPrinters();
    }
    
    /**
     * 
     */
    instance.print_engine.test_printer = function (element, action) {
        if (!instance.print_engine.socket_manager) {
            return;
        }

        instance.print_engine.socket_manager.test();
    }

    /**
     * 
     */
    instance.print_engine.print = function (element, action) {
        if (!instance.print_engine.socket_manager) {
            return;
        }

        instance.print_engine.socket_manager.print();
    }

    instance.web.client_actions.add('print_engine.ping', 'instance.print_engine.ping')
    instance.web.client_actions.add('print_engine.discovery_printers', 'instance.print_engine.discovery_printers')
    instance.web.client_actions.add('print_engine.test_printer', 'instance.print_engine.test_printer')


    if (instance.web && instance.web.UserMenu) {
        instance.web.UserMenu.include({
            do_update: function(){
                var printer = new openerp.print_engine.PrinterTopWidget(this);
                printer.appendTo($('.oe_systray'));

                instance.print_engine.socket_manager = new instance.print_engine.SocketManager()

                return this._super.apply(this, arguments);
            }
        });
    }
})()