// TODO document this user agent function
var labelType, useGradients, nativeTextSupport, animate;
(function () {
    var ua = navigator.userAgent,
        iStuff = ua.match(/iPhone/i) || ua.match(/iPad/i),
        typeOfCanvas = typeof HTMLCanvasElement,
        nativeCanvasSupport = (typeOfCanvas == 'object' || typeOfCanvas == 'function'),
        textSupport = nativeCanvasSupport && (typeof document.createElement('canvas').getContext('2d').fillText == 'function');
    //I'm setting this based on the fact that ExCanvas provides text support for IE
    //and that as of today iPhone/iPad current text support is lame
    labelType = (!nativeCanvasSupport || (textSupport && !iStuff)) ? 'Native' : 'HTML';
    nativeTextSupport = labelType == 'Native';
    useGradients = nativeCanvasSupport;
    animate = !(iStuff || !nativeCanvasSupport);
})();

// TODO eliminate these 5 top-level variables
Metamaps.panningInt = null;
Metamaps.tempNode = null;
Metamaps.tempInit = false;
Metamaps.tempNode2 = null;
Metamaps.VERSION = '<%= METAMAPS_VERSION %>'
Metamaps.Erb = {}
Metamaps.Erb['REALTIME_SERVER'] = '<%= ENV['REALTIME_SERVER'] %>'
Metamaps.Erb['junto_spinner_darkgrey.gif'] = '<%= asset_path('junto_spinner_darkgrey.gif') %>'

Metamaps.Settings = {
    embed: false, // indicates that the app is on a page that is optimized for embedding in iFrames on other web pages
    sandbox: false, // puts the app into a mode (when true) where it only creates data locally, and isn't writing it to the database
    colors: {
        background: '#344A58',
        synapses: {
            normal: '#888888',
            hover: '#888888',
            selected: '#FFFFFF'
        },
        topics: {
            selected: '#FFFFFF'
        },
        labels: {
            background: '#18202E',
            text: '#DDD'
        }
    },
};

Metamaps.Touch = {
    touchPos: null, // this stores the x and y values of a current touch event
    touchDragNode: null // this stores a reference to a JIT node that is being dragged
};

Metamaps.Mouse = {
    didPan: false,
    didBoxZoom: false,
    changeInX: 0,
    changeInY: 0,
    edgeHoveringOver: false,
    boxStartCoordinates: false,
    boxEndCoordinates: false,
    synapseStartCoordinates: [],
    synapseEndCoordinates: null,
    lastNodeClick: 0,
    lastCanvasClick: 0,
    DOUBLE_CLICK_TOLERANCE: 300
};

Metamaps.Selected = {
    reset: function () {
        var self = Metamaps.Selected;

        self.Nodes = [];
        self.Edges = [];
    },
    Nodes: [],
    Edges: []
};

/*
 *
 *   BACKBONE
 *
 */
Metamaps.Backbone.init = function () {
    var self = Metamaps.Backbone;

    self.Metacode = Backbone.Model.extend({
        initialize: function () {
            var image = new Image();
            image.crossOrigin = "Anonymous";
            image.src = this.get('icon');
            this.set('image',image);
        },
        prepareLiForFilter: function () {
            var li = '';
            li += '<li data-id="' + this.id.toString() + '">';      
            li += '<img src="' + this.get('icon') + '" data-id="' + this.id.toString() + '"';
            li += ' alt="' + this.get('name') + '" />';      
            li += '<p>' + this.get('name').toLowerCase() + '</p></li>';
            return li;
        }

    });
    self.MetacodeCollection = Backbone.Collection.extend({
        model: this.Metacode,
        url: '/metacodes',
        comparator: function (a, b) {
            a = a.get('name').toLowerCase();
            b = b.get('name').toLowerCase();
            return a > b ? 1 : a < b ? -1 : 0;
        }
    });

    self.Topic = Backbone.Model.extend({
        urlRoot: '/topics',
        blacklist: ['node', 'created_at', 'updated_at', 'user_name', 'user_image', 'map_count', 'synapse_count'],
        toJSON: function (options) {
            return _.omit(this.attributes, this.blacklist);
        },
        save: function (key, val, options) {

            var attrs;

            // Handle both `"key", value` and `{key: value}` -style arguments.
            if (key == null || typeof key === 'object') {
                attrs = key;
                options = val;
            } else {
                (attrs = {})[key] = val;
            }

            var newOptions = options || {};
            var s = newOptions.success;

            var permBefore = this.get('permission');

            newOptions.success = function (model, response, opt) {
                if (s) s(model, response, opt);
                model.trigger('saved');

                if (permBefore === 'private' && model.get('permission') !== 'private') {
                    model.trigger('noLongerPrivate');
                }
                else if (permBefore !== 'private' && model.get('permission') === 'private') {
                    model.trigger('nowPrivate');
                }
            };
            return Backbone.Model.prototype.save.call(this, attrs, newOptions);
        },
        initialize: function () {
            if (this.isNew()) {
                this.set({
                    "user_id": Metamaps.Active.Mapper.id,
                    "desc": '',
                    "link": '',
                    "permission": Metamaps.Active.Map ? Metamaps.Active.Map.get('permission') : 'commons'
                });
            }

            this.on('changeByOther', this.updateCardView);
            this.on('change', this.updateNodeView);
            this.on('saved', this.savedEvent);
            this.on('nowPrivate', function(){
                var removeTopicData = {
                    mappableid: this.id
                };

                $(document).trigger(Metamaps.JIT.events.removeTopic, [removeTopicData]);
            });
            this.on('noLongerPrivate', function(){
                var newTopicData = {
                    mappingid: this.getMapping().id,
                    mappableid: this.id
                };

                $(document).trigger(Metamaps.JIT.events.newTopic, [newTopicData]);
            });

            this.on('change:metacode_id', Metamaps.Filter.checkMetacodes, this);

        },
        authorizeToEdit: function (mapper) {
          if (mapper && 
               (this.get('calculated_permission') === "commons" ||
                this.get('collaborator_ids').includes(mapper.get('id')) ||
                this.get('user_id') === mapper.get('id'))) {
            return true
          }  else {
            return false
          }
        },
        authorizePermissionChange: function (mapper) {
            if (mapper && this.get('user_id') === mapper.get('id')) return true;
            else return false;
        },
        getDate: function () {

        },
        getMetacode: function () {
            return Metamaps.Metacodes.get(this.get('metacode_id'));
        },
        getMapping: function () {

            if (!Metamaps.Active.Map) return false;

            return Metamaps.Mappings.findWhere({
                map_id: Metamaps.Active.Map.id,
                mappable_type: "Topic",
                mappable_id: this.isNew() ? this.cid : this.id
            });
        },
        createNode: function () {
            var mapping;
            var node = {
                adjacencies: [],
                id: this.isNew() ? this.cid : this.id,
                name: this.get('name')
            };

            if (Metamaps.Active.Map) {
                mapping = this.getMapping();
                node.data = {
                    $mapping: null,
                    $mappingID: mapping.id
                };
            }

            return node;
        },
        updateNode: function () {
            var mapping;
            var node = this.get('node');
            node.setData('topic', this);

            if (Metamaps.Active.Map) {
                mapping = this.getMapping();
                node.setData('mapping', mapping);
            }

            return node;
        },
        savedEvent: function() {
            Metamaps.Realtime.sendTopicChange(this);
        },
        updateViews: function() {
            var onPageWithTopicCard = Metamaps.Active.Map || Metamaps.Active.Topic;
            var node = this.get('node');
            // update topic card, if this topic is the one open there
            if (onPageWithTopicCard && this == Metamaps.TopicCard.openTopicCard) {
                Metamaps.TopicCard.showCard(node);
            }

            // update the node on the map
            if (onPageWithTopicCard && node) {
                node.name = this.get('name');
                Metamaps.Visualize.mGraph.plot();
            }
        },
        updateCardView: function() {
            var onPageWithTopicCard = Metamaps.Active.Map || Metamaps.Active.Topic;
            var node = this.get('node');
            // update topic card, if this topic is the one open there
            if (onPageWithTopicCard && this == Metamaps.TopicCard.openTopicCard) {
                Metamaps.TopicCard.showCard(node);
            }
        },
        updateNodeView: function() {
            var onPageWithTopicCard = Metamaps.Active.Map || Metamaps.Active.Topic;
            var node = this.get('node');

            // update the node on the map
            if (onPageWithTopicCard && node) {
                node.name = this.get('name');
                Metamaps.Visualize.mGraph.plot();
            }
        }
    });

    self.TopicCollection = Backbone.Collection.extend({
        model: self.Topic,
        url: '/topics'
    });

    self.Synapse = Backbone.Model.extend({
        urlRoot: '/synapses',
        blacklist: ['edge', 'created_at', 'updated_at'],
        toJSON: function (options) {
            return _.omit(this.attributes, this.blacklist);
        },
        save: function (key, val, options) {

            var attrs;

            // Handle both `"key", value` and `{key: value}` -style arguments.
            if (key == null || typeof key === 'object') {
                attrs = key;
                options = val;
            } else {
                (attrs = {})[key] = val;
            }

            var newOptions = options || {};
            var s = newOptions.success;

            var permBefore = this.get('permission');

            newOptions.success = function (model, response, opt) {
                if (s) s(model, response, opt);
                model.trigger('saved');

                if (permBefore === 'private' && model.get('permission') !== 'private') {
                    model.trigger('noLongerPrivate');
                }
                else if (permBefore !== 'private' && model.get('permission') === 'private') {
                    model.trigger('nowPrivate');
                }
            };
            return Backbone.Model.prototype.save.call(this, attrs, newOptions);
        },
        initialize: function () {
            if (this.isNew()) {
                this.set({
                    "user_id": Metamaps.Active.Mapper.id,
                    "permission": Metamaps.Active.Map ? Metamaps.Active.Map.get('permission') : 'commons',
                    "category": "from-to"
                });
            }

            this.on('changeByOther', this.updateCardView);
            this.on('change', this.updateEdgeView);
            this.on('saved', this.savedEvent);
            this.on('noLongerPrivate', function(){
                var newSynapseData = {
                    mappingid: this.getMapping().id,
                    mappableid: this.id
                };

                $(document).trigger(Metamaps.JIT.events.newSynapse, [newSynapseData]);
            });
            this.on('nowPrivate', function(){
                $(document).trigger(Metamaps.JIT.events.removeSynapse, [{
                    mappableid: this.id
                }]);
            });

            this.on('change:desc', Metamaps.Filter.checkSynapses, this);
        },
        prepareLiForFilter: function () {
            var li = '';
            li += '<li data-id="' + this.get('desc') + '">';      
            li += '<img src="<%= asset_path('synapse16.png') %>"';
            li += ' alt="synapse icon" />';      
            li += '<p>' + this.get('desc') + '</p></li>';
            return li;
        },
        authorizeToEdit: function (mapper) {
            if (mapper && (this.get('calculated_permission') === "commons" || this.get('collaborator_ids').includes(mapper.get('id')) || this.get('user_id') === mapper.get('id'))) return true;
            else return false;
        },
        authorizePermissionChange: function (mapper) {
            if (mapper && this.get('user_id') === mapper.get('id')) return true;
            else return false;
        },
        getTopic1: function () {
            return Metamaps.Topics.get(this.get('node1_id'));
        },
        getTopic2: function () {
            return Metamaps.Topics.get(this.get('node2_id'));
        },
        getDirection: function () {
            var t1 = this.getTopic1(),
                t2 = this.getTopic2();

            return t1 && t2 ? [
                    t1.get('node').id,
                    t2.get('node').id
                ] : false;
        },
        getMapping: function () {

            if (!Metamaps.Active.Map) return false;

            return Metamaps.Mappings.findWhere({
                map_id: Metamaps.Active.Map.id,
                mappable_type: "Synapse",
                mappable_id: this.isNew() ? this.cid : this.id
            });
        },
        createEdge: function (providedMapping) {
            var mapping, mappingID;
            var synapseID = this.isNew() ? this.cid : this.id;

            var edge = {
                nodeFrom: this.get('node1_id'),
                nodeTo: this.get('node2_id'),
                data: {
                    $synapses: [],
                    $synapseIDs: [synapseID],
                }
            };

            if (Metamaps.Active.Map) {
                mapping = providedMapping || this.getMapping();
                mappingID = mapping.isNew() ? mapping.cid : mapping.id;
                edge.data.$mappings = [];
                edge.data.$mappingIDs = [mappingID];
            }

            return edge;
        },
        updateEdge: function () {
            var mapping;
            var edge = this.get('edge');
            edge.getData('synapses').push(this);

            if (Metamaps.Active.Map) {
                mapping = this.getMapping();
                edge.getData('mappings').push(mapping);
            }

            return edge;
        },
        savedEvent: function() {
            Metamaps.Realtime.sendSynapseChange(this);
        },
        updateViews: function() {
            this.updateCardView();
            this.updateEdgeView();
        },
        updateCardView: function() {
            var onPageWithSynapseCard = Metamaps.Active.Map || Metamaps.Active.Topic;
            var edge = this.get('edge');

            // update synapse card, if this synapse is the one open there
            if (onPageWithSynapseCard && edge == Metamaps.SynapseCard.openSynapseCard) {
                Metamaps.SynapseCard.showCard(edge);
            }
        },
        updateEdgeView: function() {
            var onPageWithSynapseCard = Metamaps.Active.Map || Metamaps.Active.Topic;
            var edge = this.get('edge');

            // update the edge on the map
            if (onPageWithSynapseCard && edge) {
                Metamaps.Visualize.mGraph.plot();
            }
        }
    });

    self.SynapseCollection = Backbone.Collection.extend({
        model: self.Synapse,
        url: '/synapses'
    });

    self.Mapping = Backbone.Model.extend({
        urlRoot: '/mappings',
        blacklist: ['created_at', 'updated_at'],
        toJSON: function (options) {
            return _.omit(this.attributes, this.blacklist);
        },
        initialize: function () {
            if (this.isNew()) {
                this.set({
                    "user_id": Metamaps.Active.Mapper.id,
                    "map_id": Metamaps.Active.Map ? Metamaps.Active.Map.id : null
                });
            }
        },
        getMap: function () {
            return Metamaps.Map.get(this.get('map_id'));
        },
        getTopic: function () {
            if (this.get('mappable_type') === 'Topic') return Metamaps.Topic.get(this.get('mappable_id'));
            else return false;
        },
        getSynapse: function () {
            if (this.get('mappable_type') === 'Synapse') return Metamaps.Synapse.get(this.get('mappable_id'));
            else return false;
        }
    });

    self.MappingCollection = Backbone.Collection.extend({
        model: self.Mapping,
        url: '/mappings'
    });

    Metamaps.Metacodes = Metamaps.Metacodes ? new self.MetacodeCollection(Metamaps.Metacodes) : new self.MetacodeCollection();

    Metamaps.Topics = Metamaps.Topics ? new self.TopicCollection(Metamaps.Topics) : new self.TopicCollection();

    Metamaps.Synapses = Metamaps.Synapses ? new self.SynapseCollection(Metamaps.Synapses) : new self.SynapseCollection();

    Metamaps.Mappers = Metamaps.Mappers ? new self.MapperCollection(Metamaps.Mappers) : new self.MapperCollection();

    Metamaps.Collaborators = Metamaps.Collaborators ? new self.MapperCollection(Metamaps.Collaborators) : new self.MapperCollection();

    // this is for topic view
    Metamaps.Creators = Metamaps.Creators ? new self.MapperCollection(Metamaps.Creators) : new self.MapperCollection();

    if (Metamaps.Active.Map) {
        Metamaps.Mappings = Metamaps.Mappings ? new self.MappingCollection(Metamaps.Mappings) : new self.MappingCollection();

        Metamaps.Active.Map = new self.Map(Metamaps.Active.Map);
    }

    if (Metamaps.Active.Topic) Metamaps.Active.Topic = new self.Topic(Metamaps.Active.Topic);

    //attach collection event listeners
    self.attachCollectionEvents = function () {

        Metamaps.Topics.on("add remove", function(topic){
            Metamaps.Map.InfoBox.updateNumbers();
            Metamaps.Filter.checkMetacodes();
            Metamaps.Filter.checkMappers();
        });

        Metamaps.Synapses.on("add remove", function(synapse){
            Metamaps.Map.InfoBox.updateNumbers();
            Metamaps.Filter.checkSynapses();
            Metamaps.Filter.checkMappers();
        });

        if (Metamaps.Active.Map) {
            Metamaps.Mappings.on("add remove", function(mapping){
                Metamaps.Map.InfoBox.updateNumbers();
                Metamaps.Filter.checkSynapses();
                Metamaps.Filter.checkMetacodes();
                Metamaps.Filter.checkMappers();
            });
        }
    }
    self.attachCollectionEvents();
}; // end Metamaps.Backbone.init