/*
 * Copyright 2016-present Open Networking Laboratory
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 ONOS GUI -- Topology Force Module.
 Visualization of the topology in an SVG layer, using a D3 Force Layout.
 */

(function () {
    'use strict';

    // injected refs
    var $log,
        wss;

    var t2is, t2rs, t2ls, t2vs, t2bcs, t2ss;
    var svg, forceG, uplink, dim, opts, zoomer;

    // D3 Selections
    var node;

    // ========================== Helper Functions

    function init(_svg_, _forceG_, _uplink_, _dim_, zoomer, _opts_) {
        svg = _svg_;
        forceG = _forceG_;
        uplink = _uplink_;
        dim = _dim_;
        opts = _opts_;

        t2ls = t2ls(svg, forceG, uplink, dim, zoomer, opts);
        t2bcs.addLayout(t2ls);
        t2rs.layout = t2ls;
        t2ss.init(svg, zoomer);
    }

    function destroy() {
        $log.debug('Destroy topo force layout');
    }

    // ========================== Temporary Code (to be deleted later)

    function request(dir, rid) {
        wss.sendEvent('topo2navRegion', {
            dir: dir,
            rid: rid
        });
    }

    function doTmpCurrentLayout(data) {
        var topdiv = d3.select('#topo2tmp');
        var parentRegion = data.parent;
        var span = topdiv.select('.parentRegion').select('span');
        span.text(parentRegion || '[no parent]');
        span.classed('nav-me', Boolean(parentRegion));
    }

    function doTmpCurrentRegion(data) {
        var topdiv = d3.select('#topo2tmp');
        var span = topdiv.select('.thisRegion').select('span');
        var div;

        span.text(data.id);

        div = topdiv.select('.subRegions').select('div');
        data.subregions.forEach(function (r) {

            function nav() {
                request('down', r.id);
            }

            div.append('p')
                .classed('nav-me', true)
                .text(r.id)
                .on('click', nav);
        });

        div = topdiv.select('.devices').select('div');
        data.layerOrder.forEach(function (tag, idx) {
            var devs = data.devices[idx];
            devs.forEach(function (d) {
                div.append('p')
                    .text('[' + tag + '] ' + d.id);
            });

        });

        div = topdiv.select('.hosts').select('div');
        data.layerOrder.forEach(function (tag, idx) {
            var hosts = data.hosts[idx];
            hosts.forEach(function (h) {
                div.append('p')
                    .text('[' + tag + '] ' + h.id);
            });
        });

        div = topdiv.select('.links').select('div');
        var links = data.links;
        links.forEach(function (lnk) {
            div.append('p')
                .text(lnk.id);
        });
    }

    function doTmpPeerRegions(data) {

    }

    // ========================== Event Handlers

    function allInstances(data) {
        $log.debug('>> topo2AllInstances event:', data);
        doTmpCurrentLayout(data);
        t2is.allInstances(data);
    }

    function currentLayout(data) {
        $log.debug('>> topo2CurrentLayout event:', data);
        t2bcs.addBreadcrumb(data.crumbs);
        t2rs.addLayout(data);
    }

    function currentRegion(data) {
        $log.debug('>> topo2CurrentRegion event:', data);
        doTmpCurrentRegion(data);
        t2rs.addRegion(data);
        t2ls.createForceLayout();
    }

    function topo2PeerRegions(data) {
        $log.debug('>> topo2PeerRegions event:', data);
        doTmpPeerRegions(data);
    }

    function modelEvent(data) {
        $log.debug('>> topo2UiModelEvent event:', data);

        // TODO: Interpret the event and update our topo model state (if needed)
        // To Decide: Can we assume that the server will only send events
        //    related to objects that we are currently showing?
        //    (e.g. filtered by subregion contents?)
        t2rs.update(data);
    }

    function showMastership(masterId) {
        if (masterId) {
            showMastershipFor(masterId);
        } else {
            restoreLayerState();
        }
    }

    function restoreLayerState() {
        // NOTE: this level of indirection required, for when we have
        //          the layer filter functionality re-implemented
        suppressLayers(false);
    }

    // ========================== Main Service Definition

    function showMastershipFor(id) {
        suppressLayers(true);
        node.each(function (n) {
            if (n.master === id) {
                n.el.classed('suppressedmax', false);
            }
        });
    }

    function supAmt(less) {
        return less ? 'suppressed' : 'suppressedmax';
    }

    function suppressLayers(b, less) {
        var cls = supAmt(less);
        node.classed(cls, b);
        // link.classed(cls, b);
    }

    function newDim(_dim_) {
        dim = _dim_;
        t2vs.newDim(dim);
    }

    // ========================== Main Service Definition

    function update(elements) {
        angular.forEach(elements, function (el) {
            el.update();
        });
    }

    function updateNodes() {
        update(t2rs.regionNodes());
    }

    function updateLinks() {
        update(t2rs.regionLinks());
    }

    function resetAllLocations() {
        var nodes = t2rs.regionNodes();

        angular.forEach(nodes, function (node) {
            node.resetPosition();
        });

        t2ls.update();
        t2ls.tick();
    }

    function unpin() {
        var hovered = t2rs.filterRegionNodes(function (model) {
            return model.get('hovered');
        });

        angular.forEach(hovered, function (model) {
            model.fixed = false;
            model.el.classed('fixed', false);
        });
    }

    angular.module('ovTopo2')
    .factory('Topo2ForceService', [
        '$log', 'WebSocketService', 'Topo2InstanceService',
        'Topo2RegionService', 'Topo2LayoutService', 'Topo2ViewService',
        'Topo2BreadcrumbService', 'Topo2ZoomService', 'Topo2SelectService',
        function (_$log_, _wss_, _t2is_, _t2rs_, _t2ls_,
            _t2vs_, _t2bcs_, zoomService, _t2ss_) {

            $log = _$log_;
            wss = _wss_;
            t2is = _t2is_;
            t2rs = _t2rs_;
            t2ls = _t2ls_;
            t2vs = _t2vs_;
            t2bcs = _t2bcs_;
            t2ss = _t2ss_;

            var onZoom = function () {
                var nodes = [].concat(
                        t2rs.regionNodes(),
                        t2rs.regionLinks()
                    );

                angular.forEach(nodes, function (node) {
                    node.setScale();
                });
            };

            zoomService.addZoomEventListener(onZoom);

            return {

                init: init,
                newDim: newDim,

                destroy: destroy,
                topo2AllInstances: allInstances,
                topo2CurrentLayout: currentLayout,
                topo2CurrentRegion: currentRegion,

                topo2UiModelEvent: modelEvent,

                showMastership: showMastership,
                topo2PeerRegions: topo2PeerRegions,

                updateNodes: updateNodes,
                updateLinks: updateLinks,
                resetAllLocations: resetAllLocations,
                unpin: unpin
            };
        }]);
})();