Synnefo

;(function(root){

    // root

    var root = root;

    // setup namepsaces

    var snf = root.synnefo = root.synnefo || {};

    var models = snf.models = snf.models || {}

    var storage = snf.storage = snf.storage || {};

    var util = snf.util = snf.util || {};

    // shortcuts

    var bb = root.Backbone;

    var slice = Array.prototype.slice

    // logging

    var logger = new snf.logging.logger("SNF-MODELS");

    var debug = _.bind(logger.debug, logger);

    // get url helper

    var getUrl = function(baseurl) {

        var baseurl = baseurl || snf.config.api_url;

        return baseurl + "/" + this.path;

    }

    // i18n

    BUILDING_MESSAGES = window.BUILDING_MESSAGES || {'INIT': 'init', 'COPY': '{0}, {1}, {2}', 'FINAL': 'final'};

    // Base object for all our models

    models.Model = bb.Model.extend({

        sync: snf.api.sync,

        api: snf.api,

        has_status: false,

        initialize: function() {

            if (this.has_status) {

                this.bind("change:status", this.handle_remove);

                this.handle_remove();

            }

            models.Model.__super__.initialize.apply(this, arguments)

        },

        handle_remove: function() {

            if (this.get("status") == 'DELETED') {

                if (this.collection) {

                    try { this.clear_pending_action();} catch (err) {};

                    try { this.reset_pending_actions();} catch (err) {};

                    try { this.stop_stats_update();} catch (err) {};

                    this.collection.remove(this.id);

                }

            }

        },

        // custom set method to allow submodels to use

        // set_<attr> methods for handling the value of each

        // attribute and overriding the default set method

        // for specific parameters

        set: function(params, options) {

            _.each(params, _.bind(function(value, key){

                if (this["set_" + key]) {

                    params[key] = this["set_" + key](value);

                }

            }, this))

            var ret = bb.Model.prototype.set.call(this, params, options);

            return ret;

        },

        url: function(options) {

            return getUrl.call(this, this.base_url) + "/" + this.id;

        },

        api_path: function(options) {

            return this.path + "/" + this.id;

        },

        parse: function(resp, xhr) {

            return resp.server;

        },

        remove: function() {

            this.api.call(this.api_path(), "delete");

        },

        changedKeys: function() {

            return _.keys(this.changedAttributes() || {});

        },

        hasOnlyChange: function(keys) {

            var ret = false;

            _.each(keys, _.bind(function(key) {

                if (this.changedKeys().length == 1 && this.changedKeys().indexOf(key) > -1) { ret = true};

            }, this));

            return ret;

        }

    })

    // Base object for all our model collections

    models.Collection = bb.Collection.extend({

        sync: snf.api.sync,

        api: snf.api,

        supportIncUpdates: true,

        url: function(options) {

            return getUrl.call(this, this.base_url) + (options.details || this.details ? '/detail' : '');

        },

        fetch: function(options) {

            if (!options) { options = {} };

            // default to update

            if (!this.noUpdate) {

                if (options.update === undefined) { options.update = true };

                if (!options.removeMissing && options.refresh) { options.removeMissing = true };

            } else {

                if (options.refresh === undefined) {

                    options.refresh = true;

                }

            }

            // custom event foreach fetch

            return bb.Collection.prototype.fetch.call(this, options)

        },

        create: function(model, options) {

            var coll = this;

            options || (options = {});

            model = this._prepareModel(model, options);

            if (!model) return false;

            var success = options.success;

            options.success = function(nextModel, resp, xhr) {

                if (success) success(nextModel, resp, xhr);

            };

            model.save(null, options);

            return model;

        },

        get_fetcher: function(timeout, fast, limit, initial, params) {

            var fetch_params = params || {};

            fetch_params.skips_timeouts = true;

            var timeout = parseInt(timeout);

            var fast = fast || 1000;

            var limit = limit;

            var initial_call = initial || true;

            var last_ajax = undefined;

            var cb = _.bind(function() {

                // clone to avoid referenced objects

                var params = _.clone(fetch_params);

                updater._ajax = last_ajax;

                if (last_ajax) {

                    last_ajax.abort();

                }

                last_ajax = this.fetch(params);

            }, this);

            var updater = new snf.api.updateHandler({'callback': cb, timeout:timeout, 

                                                    fast:fast, limit:limit, 

                                                    call_on_start:initial_call});

            snf.api.bind("call", _.throttle(_.bind(function(){ updater.faster(true)}, this)), 1000);

            return updater;

        }

    });

    // Image model

    models.Image = models.Model.extend({

        path: 'images',

        get_size: function() {

            return parseInt(this.get('metadata') ? this.get('metadata').values.size : -1)

        },

        get_readable_size: function() {

            return this.get_size() > 0 ? util.readablizeBytes(this.get_size() * 1024 * 1024) : "unknown";

        },

        get_os: function() {

            return this.get("OS");

        },

        get_created_user: function() {

            return synnefo.config.os_created_users[this.get_os()] || "root";

        },

        get_sort_order: function() {

            return parseInt(this.get('metadata') ? this.get('metadata').values.sortorder : -1)

        },

        ssh_keys_path: function() {

            prepend = '';

            if (this.get_created_user() != 'root') {

                prepend = '/home'

            }

            return '{1}/{0}/.ssh/authorized_keys'.format(this.get_created_user(), prepend);

        },

        _supports_ssh: function() {

            if (synnefo.config.support_ssh_os_list.indexOf(this.get_os()) > -1) {

                return true;

            }

            return false;

        },

        supports: function(feature) {

            if (feature == "ssh") {

                return this._supports_ssh()

            }

            return false;

        },

        personality_data_for_keys: function(keys) {

            contents = '';

            _.each(keys, function(key){

                contents = contents + key.get("content") + "\n"

            });

            contents = $.base64.encode(contents);

            return {

                path: this.ssh_keys_path(),

                contents: contents

            }

        }

    });

    // Flavor model

    models.Flavor = models.Model.extend({

        path: 'flavors',

        details_string: function() {

            return "{0} CPU, {1}MB, {2}GB".format(this.get('cpu'), this.get('ram'), this.get('disk'));

        },

        get_disk_size: function() {

            return parseInt(this.get("disk") * 1000)

        }

    });

    //network vms list helper

    var NetworkVMSList = function() {

        this.initialize = function() {

            this.vms = [];

            this.pending = [];

            this.pending_for_removal = [];

        }

        this.add_pending_for_remove = function(vm_id) {

            if (this.pending_for_removal.indexOf(vm_id) == -1) {

                this.pending_for_removal.push(vm_id);

            }

            if (this.pending_for_removal.length) {

                this.trigger("pending:remove:add");

            }

        },

        this.add_pending = function(vm_id) {

            if (this.pending.indexOf(vm_id) == -1) {

                this.pending[this.pending.length] = vm_id;

            }

            if (this.pending.length) {

                this.trigger("pending:add");

            }

        }

        this.check_pending = function() {

            var len = this.pending.length;

            var args = [this.pending];

            this.pending = _.difference(this.pending, this.vms);

            if (len != this.pending.length) {

                if (this.pending.length == 0) {

                    this.trigger("pending:clear");

                }

            }

            var len = this.pending_for_removal.length;

            this.pending_for_removal = _.intersection(this.pending_for_removal, this.vms);

            if (this.pending_for_removal.length == 0) {

                this.trigger("pending:remove:clear");

            }

        }

        this.add = function(vm_id) {

            if (this.vms.indexOf(vm_id) == -1) {

                this.vms[this.vms.length] = vm_id;

                this.trigger("network:connect", vm_id);

                this.check_pending();

                return true;

            }

        }

        this.remove = function(vm_id) {

            if (this.vms.indexOf(vm_id) > -1) {

                this.vms = _.without(this.vms, vm_id);

                this.trigger("network:disconnect", vm_id);

                this.check_pending();

                return true;

            }

        }

        this.get = function() {

            return this.vms;

        }

        this.list = function() {

            return storage.vms.filter(_.bind(function(vm){

                return this.vms.indexOf(vm.id) > -1;

            }, this))

        }

        this.initialize();

    };

    _.extend(NetworkVMSList.prototype, bb.Events);

    // vm networks list helper

    var VMNetworksList = function() {

        this.initialize = function() {

            this.networks = {};

            this.network_ids = [];

        }

        this.add = function(net_id, data) {

            if (!this.networks[net_id]) {

                this.networks[net_id] = data || {};

                this.network_ids[this.network_ids.length] = net_id;

                this.trigger("network:connect", net_id);

                return true;

            }

        }

        this.remove = function(net_id) {

            if (this.networks[net_id]) {

                delete this.networks[net_id];

                this.network_ids = _.without(this.network_ids, net_id);

                this.trigger("network:disconnect", net_id);

                return true;

            }

            return false;

        }

        this.get = function() {

            return this.networks;

        }

        this.list = function() {

            return storage.networks.filter(_.bind(function(net){

                return this.network_ids.indexOf(net.id) > -1;

            }, this))

        }

        this.initialize();

    };

    _.extend(VMNetworksList.prototype, bb.Events);

    models.ParamsList = function(){this.initialize.apply(this, arguments)};

    _.extend(models.ParamsList.prototype, bb.Events, {

        initialize: function(parent, param_name) {

            this.parent = parent;

            this.actions = {};

            this.param_name = param_name;

            this.length = 0;

        },

        has_action: function(action) {

            return this.actions[action] ? true : false;

        },

        _parse_params: function(arguments) {

            if (arguments.length <= 1) {

                return [];

            }

            var args = _.toArray(arguments);

            return args.splice(1);

        },

        contains: function(action, params) {

            params = this._parse_params(arguments);

            var has_action = this.has_action(action);

            if (!has_action) { return false };

            var paramsEqual = false;

            _.each(this.actions[action], function(action_params) {

                if (_.isEqual(action_params, params)) {

                    paramsEqual = true;

                }

            });

            return paramsEqual;

        },

        is_empty: function() {

            return _.isEmpty(this.actions);

        },

        add: function(action, params) {

            params = this._parse_params(arguments);

            if (this.contains.apply(this, arguments)) { return this };

            var isnew = false

            if (!this.has_action(action)) {

                this.actions[action] = [];

                isnew = true;

            };

            this.actions[action].push(params);

            this.parent.trigger("change:" + this.param_name, this.parent, this);

            if (isnew) {

                this.trigger("add", action, params);

            } else {

                this.trigger("change", action, params);

            }

            return this;

        },

        remove_all: function(action) {

            if (this.has_action(action)) {

                delete this.actions[action];

                this.parent.trigger("change:" + this.param_name, this.parent, this);

                this.trigger("remove", action);

            }

            return this;

        },

        reset: function() {

            this.actions = {};

            this.parent.trigger("change:" + this.param_name, this.parent, this);

            this.trigger("reset");

            this.trigger("remove");

        },

        remove: function(action, params) {

            params = this._parse_params(arguments);

            if (!this.has_action(action)) { return this };

            var index = -1;

            _.each(this.actions[action], _.bind(function(action_params) {

                if (_.isEqual(action_params, params)) {

                    index = this.actions[action].indexOf(action_params);

                }

            }, this));

            if (index > -1) {

                this.actions[action].splice(index, 1);

                if (_.isEmpty(this.actions[action])) {

                    delete this.actions[action];

                }

                this.parent.trigger("change:" + this.param_name, this.parent, this);

                this.trigger("remove", action, params);

            }

        }

    });

    // Image model

    models.Network = models.Model.extend({

        path: 'networks',

        has_status: true,

        initialize: function() {

            this.vms = new NetworkVMSList();

            this.vms.bind("pending:add", _.bind(this.handle_pending_connections, this, "add"));

            this.vms.bind("pending:clear", _.bind(this.handle_pending_connections, this, "clear"));

            this.vms.bind("pending:remove:add", _.bind(this.handle_pending_connections, this, "add"));

            this.vms.bind("pending:remove:clear", _.bind(this.handle_pending_connections, this, "clear"));

            var ret = models.Network.__super__.initialize.apply(this, arguments);

            storage.vms.bind("change:linked_to_nets", _.bind(this.update_connections, this, "vm:change"));

            storage.vms.bind("add", _.bind(this.update_connections, this, "add"));

            storage.vms.bind("remove", _.bind(this.update_connections, this, "remove"));

            storage.vms.bind("reset", _.bind(this.update_connections, this, "reset"));

            this.bind("change:linked_to", _.bind(this.update_connections, this, "net:change"));

            this.update_connections();

            this.update_state();

            this.set({"actions": new models.ParamsList(this, "actions")});

            return ret;

        },

        update_state: function() {

            if (this.vms.pending.length) {

                this.set({state: "CONNECTING"});

                return

            }

            if (this.vms.pending_for_removal.length) {

                this.set({state: "DISCONNECTING"});

                return

            }   

            var firewalling = false;

            _.each(this.vms.get(), _.bind(function(vm_id){

                var vm = storage.vms.get(vm_id);

                if (!vm) { return };

                if (!_.isEmpty(vm.pending_firewalls)) {

                    this.set({state:"FIREWALLING"});

                    firewalling = true;

                    return false;

                }

            },this));

            if (firewalling) { return };

            this.set({state:"NORMAL"});

        },

        handle_pending_connections: function(action) {

            this.update_state();

        },

        // handle vm/network connections

        update_connections: function(action, model) {

            // vm removed disconnect vm from network

            if (action == "remove") {

                var removed_from_net = this.vms.remove(model.id);

                var removed_from_vm = model.networks.remove(this.id);

                if (removed_from_net) {this.trigger("vm:disconnect", model, this); this.change()};

                if (removed_from_vm) {model.trigger("network:disconnect", this, model); this.change()};

                return;

            }

            // update links for all vms

            var links = this.get("linked_to");

            storage.vms.each(_.bind(function(vm) {

                var vm_links = vm.get("linked_to") || [];

                if (vm_links.indexOf(this.id) > -1) {

                    // vm has connection to current network

                    if (links.indexOf(vm.id) > -1) {

                        // and network has connection to vm, so try

                        // to append it

                        var add_to_net = this.vms.add(vm.id);

                        var index = _.indexOf(vm_links, this.id);

                        var add_to_vm = vm.networks.add(this.id, vm.get("linked_to_nets")[index]);

                        // call only if connection did not existed

                        if (add_to_net) {this.trigger("vm:connect", vm, this); this.change()};

                        if (add_to_vm) {vm.trigger("network:connect", this, vm); vm.change()};

                    } else {

                        // no connection, try to remove it

                        var removed_from_net = this.vms.remove(vm.id);

                        var removed_from_vm = vm.networks.remove(this.id);

                        if (removed_from_net) {this.trigger("vm:disconnect", vm, this); this.change()};

                        if (removed_from_vm) {vm.trigger("network:disconnect", this, vm); vm.change()};

                    }

                } else {

                    // vm has no connection to current network, try to remove it

                    var removed_from_net = this.vms.remove(vm.id);

                    var removed_from_vm = vm.networks.remove(this.id);

                    if (removed_from_net) {this.trigger("vm:disconnect", vm, this); this.change()};

                    if (removed_from_vm) {vm.trigger("network:disconnect", this, vm); vm.change()};

                }

            },this));

        },

        is_public: function() {

            return this.id == "public";

        },

        contains_vm: function(vm) {

            var net_vm_exists = this.vms.get().indexOf(vm.id) > -1;

            var vm_net_exists = vm.is_connected_to(this);

            return net_vm_exists && vm_net_exists;

        },

        call: function(action, params, success, error) {

            if (action == "destroy") {

                this.set({state:"DESTROY"});

                this.get("actions").remove("destroy");

                this.remove(_.bind(function(){

                    success();

                }, this), error);

            }

            if (action == "disconnect") {

                _.each(params, _.bind(function(vm_id) {

                    var vm = snf.storage.vms.get(vm_id);

                    this.get("actions").remove("disconnect", vm_id);

                    if (vm) {

                        this.remove_vm(vm, success, error);

                    }

                }, this));

            }

        },

        add_vm: function (vm, callback, error, options) {

            var payload = {add:{serverRef:"" + vm.id}};

            payload._options = options || {};

            return this.api.call(this.api_path() + "/action", "create", 

                                 payload,

                                 _.bind(function(){

                                     this.vms.add_pending(vm.id);

                                     if (callback) {callback()}

                                 },this), error);

        },

        remove_vm: function (vm, callback, error, options) {

            var payload = {remove:{serverRef:"" + vm.id}};

            payload._options = options || {};

            return this.api.call(this.api_path() + "/action", "create", 

                                 {remove:{serverRef:"" + vm.id}},

                                 _.bind(function(){

                                     this.vms.add_pending_for_remove(vm.id);

                                     if (callback) {callback()}

                                 },this), error);

        },

        rename: function(name, callback) {

            return this.api.call(this.api_path(), "update", {

                network:{name:name}, 

                _options:{

                    critical: false, 

                    error_params:{

                        title: "Network action failed",

                        ns: "Networks",

                        extra_details: {"Network id": this.id}

                    }

                }}, callback);

        },

        get_connectable_vms: function() {

            var servers = this.vms.list();

            return storage.vms.filter(function(vm){

                return servers.indexOf(vm) == -1 && !vm.in_error_state();

            })

        },

        state_message: function() {

            if (this.get("state") == "NORMAL" && this.is_public()) {

                return "Public network";

            }

            return models.Network.STATES[this.get("state")];

        },

        in_progress: function() {

            return models.Network.STATES_TRANSITIONS[this.get("state")] != undefined;

        },

        do_all_pending_actions: function(success, error) {

            var destroy = this.get("actions").has_action("destroy");

            _.each(this.get("actions").actions, _.bind(function(params, action) {

                _.each(params, _.bind(function(with_params) {

                    this.call(action, with_params, success, error);

                }, this));

            }, this));

        }

    });

    models.Network.STATES = {

        'NORMAL': 'Private network',

        'CONNECTING': 'Connecting...',

        'DISCONNECTING': 'Disconnecting...',

        'FIREWALLING': 'Firewall update...',

        'DESTROY': 'Destroying...'

    }

    models.Network.STATES_TRANSITIONS = {

        'CONNECTING': ['NORMAL'],

        'DISCONNECTING': ['NORMAL'],

        'FIREWALLING': ['NORMAL']

    }

    // Virtualmachine model

    models.VM = models.Model.extend({

        path: 'servers',

        has_status: true,

        initialize: function(params) {

            this.networks = new VMNetworksList();

            this.pending_firewalls = {};

            models.VM.__super__.initialize.apply(this, arguments);

            this.set({state: params.status || "ERROR"});

            this.log = new snf.logging.logger("VM " + this.id);

            this.pending_action = undefined;

            // init stats parameter

            this.set({'stats': undefined}, {silent: true});

            // defaults to not update the stats

            // each view should handle this vm attribute 

            // depending on if it displays stat images or not

            this.do_update_stats = false;

            // interval time

            // this will dynamicaly change if the server responds that

            // images get refreshed on different intervals

            this.stats_update_interval = synnefo.config.STATS_INTERVAL || 5000;

            this.stats_available = false;

            // initialize interval

            this.init_stats_intervals(this.stats_update_interval);

            this.bind("change:progress", _.bind(this.update_building_progress, this));

            this.update_building_progress();

            this.bind("change:firewalls", _.bind(this.handle_firewall_change, this));

            // default values

            this.set({linked_to_nets:this.get("linked_to_nets") || []});

            this.set({firewalls:this.get("firewalls") || []});

            this.bind("change:state", _.bind(function(){if (this.state() == "DESTROY") { this.handle_destroy() }}, this))

        },

        handle_firewall_change: function() {

        },

        set_linked_to_nets: function(data) {

            this.set({"linked_to":_.map(data, function(n){ return n.id})});

            return data;

        },

        is_connected_to: function(net) {

            return _.filter(this.networks.list(), function(n){return n.id == net.id}).length > 0;

        },

        status: function(st) {

            if (!st) { return this.get("status")}

            return this.set({status:st});

        },

        set_status: function(st) {

            var new_state = this.state_for_api_status(st);

            var transition = false;

            if (this.state() != new_state) {

                if (models.VM.STATES_TRANSITIONS[this.state()]) {

                    transition = this.state();

                }

            }

            // call it silently to avoid double change trigger

            this.set({'state': this.state_for_api_status(st)}, {silent: true});

            // trigger transition

            if (transition && models.VM.TRANSITION_STATES.indexOf(new_state) == -1) { 

                this.trigger("transition", {from:transition, to:new_state}) 

            };

            return st;

        },

        update_building_progress: function() {

            if (this.is_building()) {

                var progress = this.get("progress");

                if (progress == 0) {

                    this.state("BUILD_INIT");

                    this.set({progress_message: BUILDING_MESSAGES['INIT']});

                }

                if (progress > 0 && progress < 99) {

                    this.state("BUILD_COPY");

                    var params = this.get_copy_details(true);

                    this.set({progress_message: BUILDING_MESSAGES['COPY'].format(params.copy, 

                                                                                 params.size, 

                                                                                 params.progress)});

                }

                if (progress == 100) {

                    this.state("BUILD_FINAL");

                    this.set({progress_message: BUILDING_MESSAGES['FINAL']});

                }

            } else {

            }

        },

        get_copy_details: function(human, image) {

            var human = human || false;

            var image = image || this.get_image();

            var progress = this.get('progress');

            var size = image.get_size();

            var size_copied = (size * progress / 100).toFixed(2);

            if (human) {

                size = util.readablizeBytes(size*1024*1024);

                size_copied = util.readablizeBytes(size_copied*1024*1024);

            }

            return {'progress': progress, 'size': size, 'copy': size_copied};

        },

        start_stats_update: function(force_if_empty) {

            var prev_state = this.do_update_stats;

            this.do_update_stats = true;

            // fetcher initialized ??

            if (!this.stats_fetcher) {

                this.init_stats_intervals();

            }

            // fetcher running ???

            if (!this.stats_fetcher.running || !prev_state) {

                this.stats_fetcher.start();

            }

            if (force_if_empty && this.get("stats") == undefined) {

                this.update_stats(true);

            }

        },

        stop_stats_update: function(stop_calls) {

            this.do_update_stats = false;

            if (stop_calls) {

                this.stats_fetcher.stop();

            }

        },

        // clear and reinitialize update interval

        init_stats_intervals: function (interval) {

            this.stats_fetcher = this.get_stats_fetcher(this.stats_update_interval);

            this.stats_fetcher.start();

        },

        get_stats_fetcher: function(timeout) {

            var cb = _.bind(function(data){

                this.update_stats();

            }, this);

            var fetcher = new snf.api.updateHandler({'callback': cb, timeout:timeout});

            return fetcher;

        },

        // do the api call

        update_stats: function(force) {

            // do not update stats if flag not set

            if ((!this.do_update_stats && !force) || this.updating_stats) {

                return;

            }

            // make the api call, execute handle_stats_update on sucess

            // TODO: onError handler ???

            stats_url = this.url() + "/stats";

            this.updating_stats = true;

            this.sync("GET", this, {

                handles_error:true, 

                url: stats_url, 

                refresh:true, 

                success: _.bind(this.handle_stats_update, this),

                error: _.bind(this.handle_stats_error, this),

                complete: _.bind(function(){this.updating_stats = false;}, this),

                critical: false,

                display: false,

                log_error: false

            });

        },

        get_stats_image: function(stat, type) {

        },

        _set_stats: function(stats) {

            var silent = silent === undefined ? false : silent;

            // unavailable stats while building

            if (this.get("status") == "BUILD") { 

                this.stats_available = false;

            } else { this.stats_available = true; }

            if (this.get("status") == "DESTROY") { this.stats_available = false; }

            this.set({stats: stats}, {silent:true});

            this.trigger("stats:update", stats);

        },

        unbind: function() {

            models.VM.__super__.unbind.apply(this, arguments);

        },

        handle_stats_error: function() {

            stats = {};

            _.each(['cpuBar', 'cpuTimeSeries', 'netBar', 'netTimeSeries'], function(k) {

                stats[k] = false;

            });

            this.set({'stats': stats});

        },

        // this method gets executed after a successful vm stats api call

        handle_stats_update: function(data) {

            var self = this;

            // avoid browser caching

            if (data.stats && _.size(data.stats) > 0) {

                var ts = $.now();

                var stats = data.stats;

                var images_loaded = 0;

                var images = {};

                function check_images_loaded() {

                    images_loaded++;

                    if (images_loaded == 4) {

                        self._set_stats(images);

                    }

                }

                _.each(['cpuBar', 'cpuTimeSeries', 'netBar', 'netTimeSeries'], function(k) {

                    stats[k] = stats[k] + "?_=" + ts;

                    var stat = k.slice(0,3);

                    var type = k.slice(3,6) == "Bar" ? "bar" : "time";

                    var img = $("<img />");

                    var val = stats[k];

                    // load stat image to a temporary dom element

                    // update model stats on image load/error events

                    img.load(function() {

                        images[k] = val;

                        check_images_loaded();

                    });

                    img.error(function() {

                        images[stat + type] = false;

                        check_images_loaded();

                    });

                    img.attr({'src': stats[k]});

                })

                data.stats = stats;

            }

            // do we need to change the interval ??

            if (data.stats.refresh * 1000 != this.stats_update_interval) {

                this.stats_update_interval = data.stats.refresh * 1000;

                this.stats_fetcher.timeout = this.stats_update_interval;

                this.stats_fetcher.stop();

                this.stats_fetcher.start(false);

            }

        },

        // helper method that sets the do_update_stats

        // in the future this method could also make an api call

        // immediaetly if needed

        enable_stats_update: function() {

            this.do_update_stats = true;

        },

        handle_destroy: function() {

            this.stats_fetcher.stop();

        },

        require_reboot: function() {

            if (this.is_active()) {

                this.set({'reboot_required': true});

            }

        },

        set_pending_action: function(data) {

            this.pending_action = data;

            return data;

        },

        // machine has pending action

        update_pending_action: function(action, force) {

            this.set({pending_action: action});

        },

        clear_pending_action: function() {

            this.set({pending_action: undefined});

        },

        has_pending_action: function() {

            return this.get("pending_action") ? this.get("pending_action") : false;

        },

        // machine is active

        is_active: function() {

            return models.VM.ACTIVE_STATES.indexOf(this.state()) > -1;

        },

        // machine is building 

        is_building: function() {

            return models.VM.BUILDING_STATES.indexOf(this.state()) > -1;

        },

        in_error_state: function() {

            return this.state() === "ERROR"

        },

        // user can connect to machine

        is_connectable: function() {

            // check if ips exist

            if (!this.get_addresses().ip4 && !this.get_addresses().ip6) {

                return false;

            }

            return models.VM.CONNECT_STATES.indexOf(this.state()) > -1;

        },

        set_firewalls: function(data) {

            _.each(data, _.bind(function(val, key){

                if (this.pending_firewalls && this.pending_firewalls[key] && this.pending_firewalls[key] == val) {

                        this.require_reboot();

                        this.remove_pending_firewall(key, val);

                }

            }, this));

            return data;

        },

        remove_pending_firewall: function(net_id, value) {

            if (this.pending_firewalls[net_id] == value) {

                delete this.pending_firewalls[net_id];

                storage.networks.get(net_id).update_state();

            }

        },

        remove_meta: function(key, complete, error) {

            var url = this.api_path() + "/meta/" + key;

            this.api.call(url, "delete", undefined, complete, error);

        },

        save_meta: function(meta, complete, error) {

            var url = this.api_path() + "/meta/" + meta.key;

            var payload = {meta:{}};

            payload.meta[meta.key] = meta.value;

            payload._options = {

                critical:false, 

                error_params: {

                    title: "Machine metadata error",

                    extra_details: {"Machine id": this.id}

            }};

            this.api.call(url, "update", payload, complete, error);

        },

        set_firewall: function(net_id, value, callback, error, options) {

            if (this.get("firewalls") && this.get("firewalls")[net_id] == value) { return }

            this.pending_firewalls[net_id] = value;

            this.trigger("change", this, this);

            var payload = {"firewallProfile":{"profile":value}};

            payload._options = _.extend({critical: false}, options);

            // reset firewall state on error

            var error_cb = _.bind(function() {

                thi

            }, this);

            this.api.call(this.api_path() + "/action", "create", payload, callback, error);

            storage.networks.get(net_id).update_state();

        },

        firewall_pending: function(net_id) {

            return this.pending_firewalls[net_id] != undefined;

        },

        // update/get the state of the machine

        state: function() {

            var args = slice.call(arguments);

            // TODO: it might not be a good idea to set the state in set_state method

            if (args.length > 0 && models.VM.STATES.indexOf(args[0]) > -1) {

                this.set({'state': args[0]});

            }

            return this.get('state');

        },

        // get the state that the api status corresponds to

        state_for_api_status: function(status) {

            return this.state_transition(this.state(), status);

        },

        // vm state equals vm api status

        state_is_status: function(state) {

            return models.VM.STATUSES.indexOf(state) != -1;

        },

        // get transition state for the corresponging api status

        state_transition: function(state, new_status) {

            var statuses = models.VM.STATES_TRANSITIONS[state];

            if (statuses) {

                if (statuses.indexOf(new_status) > -1) {

                    return new_status;

                } else {

                    return state;

                }

            } else {

                return new_status;

            }

        },

        // the current vm state is a transition state

        in_transition: function() {

            return models.VM.TRANSITION_STATES.indexOf(this.state()) > -1 || 

                models.VM.TRANSITION_STATES.indexOf(this.get('status')) > -1;

        },

        // get image object

        // TODO: update images synchronously if image not found

        get_image: function() {

            var image = storage.images.get(this.get('imageRef'));

            if (!image) {

                storage.images.update_unknown_id(this.get('imageRef'));

                image = storage.images.get(this.get('imageRef'));

            }

            return image;

        },

        // get flavor object

        get_flavor: function() {

            var flv = storage.flavors.get(this.get('flavorRef'));

            if (!flv) {

                storage.flavors.update_unknown_id(this.get('flavorRef'));

                flv = storage.flavors.get(this.get('flavorRef'));

            }

            return flv;