angular.module('odoo')

.factory('customers', function (storage, odoo, async) {
    return {
        sync: function (success, error) {
            // Get current user saved on mobile
            storage.get('user', function (users) {
                if (users.length == 1) {
                    var userConfig = users.item(0);

                    // 1. Transfer all new data from mobile to server
                    storage.getByConstraint('partner', 'remote_id = 0 AND customer = 1', function(newPartners) {
                        async.loop(newPartners.length, function (loop) {
                            var data = newPartners.item(loop.iteration());

                            // Avoid odoo server warning message
                            delete data.id;
                            delete data.remote_id;
                            delete data.modified;
                            delete data.modifiedDate;

                            odoo.create('res.partner', data, userConfig, function (response) {
                                loop.next();
                            }, function (odooCreateError) {
                                loop.break();
                            });

                        // End loop
                        }, function() {
                            // 2. Transfer all modified data from mobile to server
                            storage.getByConstraint('partner', 'remote_id != 0 AND customer = 1 AND modified = 1', function (modifiedPartners) {
                                async.loop(modifiedPartners.length, function (loop) {
                                    var localData = modifiedPartners.item(loop.iteration());

                                    odoo.read('res.partner', [['id', '=', localData.remote_id]], userConfig, function (response) {
                                        if (response.length == 1) {
                                            var remoteData = response[0];

                                            var remoteModifiedDate = new Date(remoteData.__last_update);
                                            var localModifiedDate = new Date(localData.modifiedDate);

                                            if (localModifiedDate > remoteModifiedDate) {
                                                var id = localData.remote_id;

                                                // Avoid odoo server warning message
                                                delete localData.id;
                                                delete localData.remote_id;
                                                delete localData.modified;
                                                delete localData.modifiedDate;

                                                odoo.write('res.partner', id, localData, userConfig, function (response) {
                                                    loop.next();
                                                }, function (odooWriteError) {
                                                    console.error(odooWriteError);
                                                    loop.next();
                                                });
                                            } else {
                                                loop.next();
                                            }
                                        } else {
                                            loop.next();
                                        }
                                    }, function(odooReadError) {
                                        console.error(odooReadError);
                                        loop.next();
                                    });

                                // End loop
                                }, function () {
                                    // 3. Delete server data from mobile
                                    storage.getByConstraint('partner', 'remote_id != 0 AND customer = 1 AND modified = 2', function (deletedPartners) {
                                        async.loop(deletedPartners.length, function (loop) {
                                            var id = deletedPartners.item(loop.iteration()).remote_id;

                                            odoo.unlink('res.partner', id, userConfig, function (response) {
                                                loop.next();
                                            }, function (odooUnlinkError) {
                                                console.error(odooUnlinkError);
                                                loop.next();
                                            });

                                        // End loop
                                        }, function () {
                                            // 4. Download updated data from server to mobile
                                            odoo.read('res.partner', [['customer', '=', true]], userConfig, function (updatedPartners) {
                                                storage.deleteAllCustomers(function () {
                                                    async.loop(updatedPartners.length, function (loop) {
                                                        var data = updatedPartners[loop.iteration()];

                                                        // Set id for save on local database
                                                        data.remote_id = data.id;
                                                        delete data.id;

                                                        storage.saveCustomer(data, function (customerId) {
                                                            loop.next();
                                                        } ,function (saveCustomerError) {
                                                            console.error(saveCustomerError);
                                                            loop.next();
                                                        });
                                                    }, function () {
                                                        success(updatedPartners);
                                                    });
                                                }, function (deleteAllCustomersError) {
                                                    error(deleteAllCustomersError);
                                                });
                                            }, function (odooReadError) {
                                                error(odooReadError);
                                            });
                                        });
                                    }, function (getDeletedPartnersError) {
                                        error(getDeletedPartnersError);
                                    });
                                });
                            }, function (getModifiedPartnersError) {
                                error(getModifiedPartnersError);
                            });
                        });
                    }, function (partnerGetByConstraintError) {
                        error(partnerGetByConstraintError);
                    });
                }
            }, function(userGetError) {
                error(userGetError);
            });
        }
    }
});