var _gaq = _gaq || [];  // asynchronous stack used by google analytics

openerp.web_analytics = function(instance) {

    /*
    *  The Web Analytics Module inserts the Google Analytics JS Snippet
    *  at the top of the page, and sends to google an url each time the
    *  openerp url is changed.
    *  The pushes of the urls is made by triggering the 'state_pushed' event in the
    *  web_client.do_push_state() method which is responsible of changing the openerp current url
    */

    // Google Analytics Code snippet
    (function() {
        var ga   = document.createElement('script');
        ga.type  = 'text/javascript';
        ga.async = true;
        ga.src   = ('https:' === document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
        var s = document.getElementsByTagName('script')[0];
        s.parentNode.insertBefore(ga,s);
    })();

    instance.web_analytics.Tracker = instance.web.Class.extend({
        /*
        * This method initializes the tracker
        */
        init: function(webclient) {
            var self = this;
            self.initialized = $.Deferred();
            _gaq.push(['_setAccount', 'UA-7333765-1']);
            _gaq.push(['_setDomainName', '.openerp.com']);  // Allow multi-domain
            self.initialize_custom(webclient).then(function() {
                webclient.on('state_pushed', self, self.on_state_pushed);
                self.include_tracker();
            });
        },
        /*
        * This method MUST be overriden by saas_demo and saas_trial in order to
        * set the correct user type. By default, the user connected is local to
        * the DB (like in accounts).
        */
        _get_user_type: function() {
            return 'Local User';
        },
        /*
        * This method gets the user access level, to be used as CV in GA
        */
        _get_user_access_level: function() {
            if (!instance.session.session_is_valid()) {
                return "Unauthenticated User";
            }
            if (instance.session.uid === 1) {
                return 'Admin User';
            }
            // Make the difference between portal users and anonymous users
            if (instance.session.username.indexOf('@') !== -1) {
                return 'Portal User';
            }
            if (instance.session.username === 'anonymous') {
                return 'Anonymous User';
            }
            return 'Normal User';
        },
        
        /*
        * This method contains the initialization of all user-related custom variables
        * stored in GA. Also other modules can override it to add new custom variables
        * Must be followed by a call to _push_*() in order to actually send the data
        * to GA.
        */
        initialize_custom: function() {
            var self = this;
            instance.session.rpc("/web/webclient/version_info", {})
                .done(function(res) {
                    _gaq.push(['_setCustomVar', 5, 'Version', res.server_version, 3]);
                    self._push_customvars();
                    self.initialized.resolve(self);
                });
            return self.initialized;
        },

        /*
         * Method called in order to send _setCustomVar to GA
         */
        _push_customvars: function() {
            var self = this;
            // Track User Access Level, Custom Variable 4 in GA with visitor level scope
            // Values: 'Admin User', 'Normal User', 'Portal User', 'Anonymous User'
            _gaq.push(['_setCustomVar', 4, 'User Access Level', self._get_user_access_level(), 1]);

            // Track User Type Conversion, Custom Variable 3 in GA with session level scope
            // Values: 'Visitor', 'Demo', 'Online Trial', 'Online Paying', 'Local User'
            _gaq.push(['_setCustomVar', 1, 'User Type Conversion', self._get_user_type(), 2]);
        },
        
        /*
        * Method called in order to send _trackPageview to GA
        */
        _push_pageview: function(url) {
            _gaq.push(['_trackPageview', url]);
        },
        /*
        * Method called in order to send _trackEvent to GA
        */
        _push_event: function(options) {
            _gaq.push(['_trackEvent',
                options.category,
                options.action,
                options.label,
                options.value,
                options.noninteraction
            ]);
        },
        /*
        * Method called in order to send ecommerce transactions to GA
        */
        _push_ecommerce: function(trans_data, item_list) {
            _gaq.push(['_addTrans',
                trans_data.order_id,
                trans_data.store_name,
                trans_data.total,
                trans_data.tax,
                trans_data.shipping,
                trans_data.city,
                trans_data.state,
                trans_data.country,
            ]);
            _.each(item_list, function(item) {
                _gaq.push(['_addItem',
                    item.order_id,
                    item.sku,
                    item.name,
                    item.category,
                    item.price,
                    item.quantity,
                ]);
            });
            _gaq.push(['_trackTrans']);
        },
        /*
        *  This method contains the initialization of the object and view type
        *  as an event in GA.
        */
        on_state_pushed: function(state) {
            // Track only pages corresponding to a 'normal' view of OpenERP, views
            // related to client actions are tracked by the action manager
            if (state.model && state.view_type) {
                // Track the page
                var url = instance.web_analytics.generateUrl({'model': state.model, 'view_type': state.view_type});
                this._push_event({
                    'category': state.model,
                    'action': state.view_type,
                    'label': url,
                });
                this._push_pageview(url);
            }
        },
        /*
        * This method includes the tracker into views and managers. It can be overriden
        * by other modules in order to extend tracking functionalities
        */
        include_tracker: function() {
            var t = this;
            // Track the events related with the creation and the  modification of records,
            // the view type is always form
            instance.web.FormView.include({
                init: function(parent, dataset, view_id, options) {
                    this._super.apply(this, arguments);
                    var self = this;
                    this.on('record_created', self, function(r) {
                        var url = instance.web_analytics.generateUrl({'model': self.model, 'view_type': 'form'});
                        t._push_event({
                            'category': self.model,
                            'action': 'create',
                            'label': url,
                            'noninteraction': true,
                        });
                    });
                    this.on('record_saved', self, function(r) {
                        var url = instance.web_analytics.generateUrl({'model': self.model, 'view_type': 'form'});
                        t._push_event({
                            'category': self.model,
                            'action': 'save',
                            'label': url,
                            'noninteraction': true,
                        });
                    });
                }
            });

            // Track client actions
            instance.web.ActionManager.include({
                ir_actions_client: function (action, options) {
                    var url = instance.web_analytics.generateUrl({'action': action.tag});
                    t._push_event({
                        'category': action.type,
                        'action': action.tag,
                        'label': url,
                    });
                    t._push_pageview(url);
                    return this._super.apply(this, arguments);
                },
            });

            // Track button events
            instance.web.View.include({
                do_execute_action: function(action_data, dataset, record_id, on_closed) {
                    var category = this.model || dataset.model || '';
                    var action;
                    if (action_data.name && _.isNaN(action_data.name-0)) {
                        action = action_data.name;
                    } else {
                        action = action_data.string || action_data.special || '';
                    }
                    var url = instance.web_analytics.generateUrl({'model': category, 'view_type': this.view_type});
                    t._push_event({
                        'category': category,
                        'action': action,
                        'label': url,
                        'noninteraction': true,
                    });
                    return this._super.apply(this, arguments);
                },
            });

            // Track error events
            instance.web.CrashManager.include({
                show_error: function(error) {
                    var hash = window.location.hash;
                    var params = $.deparam(hash.substr(hash.indexOf('#')+1));
                    var options = {};
                    if (params.model && params.view_type) {
                        options = {'model': params.model, 'view_type': params.view_type};
                    } else {
                        options = {'action': params.action};
                    }
                    var url = instance.web_analytics.generateUrl(options);
                    t._push_event({
                        'category': options.model || "ir.actions.client",
                        'action': "error " + (error.code ? error.message + error.data.message : error.type + error.data.debug),
                        'label': url,
                        'noninteraction': true,
                    });
                    this._super.apply(this, arguments);
                },
            });
        },
    });

    // ----------------------------------------------------------------
    // utility functions
    // ----------------------------------------------------------------

    instance.web_analytics.generateUrl = function(options) {
        var url = '';
        var keys = _.keys(options);
        keys = _.sortBy(keys, function(i) { return i;});
        _.each(keys, function(key) {
            url += '/' + key + '/' + options[key];
        });
        return url;
    };

    // kept for API compatibility
    instance.web_analytics.setupTracker = function(wc) {
        return wc.tracker.initialized;
    };

    instance.web.Client.include({
        bind_events: function() {
            this._super.apply(this, arguments);
            this.tracker = new instance.web_analytics.Tracker(this);
        },
    });

    instance.web.Session.include({
        session_authenticate: function() {
            return $.when(this._super.apply(this, arguments)).then(function() {
                // the call to bind_events() may have been delayed in some embed
                // cases, and when that happens we can skip the push, as the
                // proper one will be done when bind_event is eventually called.
                if (instance.client && instance.client.tracker) {
                    instance.client.tracker._push_customvars();
                }
            });
        },
    });
 
};