/* Tracking module that listens to Renkan events */

/* globals Rkns */

/* eslint no-console: 0 */

Rkns.mtdcTracking = function(_renkan, _trackingWorker) {

    var _proj = _renkan.project;

    function prepareObjData(node) {

        var objData = node.toJSON(),

            p = node.get('project');

        objData.project = { id: p.get('id'), title: p.get('title')};

        objData.origin = node.get('origin', -1);

        return objData;

    }

    function registerNode(_node) {

        _node.on('remove', function(_n) {

            var nodeData = prepareObjData(_n);

            _trackingWorker.deleteNode(nodeData);

        });

        _node.on('change', function(_n) {

            var nodeData = prepareObjData(_n);

            var dataChanged = _n.changed;

            var previousData = Rkns._.mapValues(_n.changed, function(v,k) { return _n.previous(k); });

            _trackingWorker.updateNode(nodeData, dataChanged, previousData);

        });

    }

    function registerEdge(_edge) {

        _edge.on('remove', function(_e) {

            var edgeData = prepareObjData(_e);

            _trackingWorker.deleteEdge(edgeData);

        });

        _edge.on('change', function(_e) {

            var edgeData = prepareObjData(_e);

            var dataChanged = _e.changed;

            var previousData = Rkns._.mapValues(_e.changed, function(v,k) { return _e.previous(k); });

            _trackingWorker.updateEdge(edgeData, dataChanged, previousData);

        });

    }

    function registerView(_view) {

        _view.on('remove', function(_v) {

            var viewData = prepareObjData(_v);

            _trackingWorker.deleteView(viewData);

        });

        _view.on('change', function(_v) {

            var viewData = prepareObjData(_v);

            var dataChanged = _v.changed;

            var previousData = Rkns._.mapValues(_v.changed, function(v,k) { return _v.previous(k); });

            _trackingWorker.updateView(viewData, dataChanged, previousData);

        });

    }

    _proj.on('change:loadingStatus', function(_p) {

        if(_p.get('loadingStatus')) {

            return;

        }

        // -> track open for editing

        _p.on('add:nodes', function(_node) {

            var nodeData = prepareObjData(_node);

            registerNode(_node);

            _trackingWorker.addNode(nodeData);

        });

        _p.on('add:edges', function(_edge) {

            var edgeData = prepareObjData(_edge);

            registerEdge(_edge);

            _trackingWorker.addEdge(edgeData);

        });

        _p.on('add:views', function(_view) {

            var viewData = prepareObjData(_view);

            registerView(_view);

            _trackingWorker.addView(viewData);

        });

        _proj.get('nodes').each(function(_node) {

            registerNode(_node);

        });

        _proj.get('edges').each(function(_edge) {

            registerEdge(_edge);

        });

        _proj.get('views').each(function(_view) {

            registerView(_view);

        });

    });

};