// MAP DATA RENDER ////////////////////////////////////////////////
// class to handle rendering into leaflet the JSON data from the servers



window.Render = function() {

  // when there are lots of portals close together, we only add some of them to the map
  // the idea is to keep the impression of the dense set of portals, without rendering them all
  this.CLUSTER_SIZE = L.Browser.mobile ? 16 : 8;  // the map is divited into squares of this size in pixels for clustering purposes. mobile uses larger markers, so therefore larger clustering areas
  this.CLUSTER_PORTAL_LIMIT = 4; // no more than this many portals are drawn in each cluster square

  // link length, in pixels, to be visible. use the portal cluster size, as shorter than this is likely hidden
  // under the portals
  this.LINK_VISIBLE_PIXEL_LENGTH = this.CLUSTER_SIZE;

  this.entityVisibilityZoom = undefined;
}


// start a render pass. called as we start to make the batch of data requests to the servers
window.Render.prototype.startRenderPass = function() {
  this.isRendering = true;

  this.deletedGuid = {};  // object - represents the set of all deleted game entity GUIDs seen in a render pass

  this.seenPortalsGuid = {};
  this.seenLinksGuid = {};
  this.seenFieldsGuid = {};
}

window.Render.prototype.clearPortalsBelowLevel = function(level) {
  var count = 0;
  for (var guid in window.portals) {
    var p = portals[guid];
    // clear portals below specified level - unless it's the selected portal, or it's relevant to artifacts
    if (parseInt(p.options.level) < level && guid !== selectedPortal && !artifact.isInterestingPortal(guid)) {
      this.deletePortalEntity(guid);
      count++;
    }
  }
  console.log('Render: deleted '+count+' portals by level');
}

window.Render.prototype.clearEntitiesOutsideBounds = function(bounds) {
  var pcount=0, lcount=0, fcount=0;

  for (var guid in window.portals) {
    var p = portals[guid];
    if (!bounds.contains (p.getLatLng()) && guid !== selectedPortal && !artifact.isInterestingPortal(guid)) {
      this.deletePortalEntity(guid);
      pcount++;
    }
  }

  for (var guid in window.links) {
    var l = links[guid];
    if (!bounds.intersects (l.getBounds())) {
      this.deleteLinkEntity(guid);
      lcount++;
    }
  }

  for (var guid in window.fields) {
    var f = fields[guid];
    if (!bounds.intersects (f.getBounds())) {
      this.deleteFieldEntity(guid);
      fcount++;
    }
  }
  console.log('Render: deleted '+pcount+' portals, '+lcount+' links, '+fcount+' fields by bounds check');
}

// TODO? as well as clearing portals by level, and clearing entities outside the bounds...
// can we clear unneeded 'fake' links after zooming out? based on the portals no longer being available to construct
// the data? (not *required* - as they'll be removed in the endRenderPass code - but clearing things earlier rather than
// later is preferred, if possible)


// process deleted entity list and entity data
window.Render.prototype.processTileData = function(tiledata) {
  this.processDeletedGameEntityGuids(tiledata.deletedGameEntityGuids||[]);
  this.processGameEntities(tiledata.gameEntities||[]);
}


window.Render.prototype.processDeletedGameEntityGuids = function(deleted) {
  for(var i in deleted) {
    var guid = deleted[i];

    if ( !(guid in this.deletedGuid) ) {
      this.deletedGuid[guid] = true;  // flag this guid as having being processed

      if (guid == selectedPortal) {
        // the rare case of the selected portal being deleted. clear the details tab and deselect it
        renderPortalDetails(null);
      }

      this.deleteEntity(guid);

    }
  }

}

window.Render.prototype.processGameEntities = function(entities) {
  var portalGuids = [];

  for (var i in entities) {
    var ent = entities[i];

    // don't create entities in the 'deleted' list
    if (!(ent[0] in this.deletedGuid)) {
      this.createEntity(ent);
      if ('portalV2' in ent[2]) portalGuids.push(ent[0]);
    }
  }

  // now reconstruct links 'optimised' out of the data from the portal link data
  for (var i in portalGuids) {
    this.createLinksFromPortalData(portalGuids[i]);
  }
}


// end a render pass. does any cleaning up required, postponed processing of data, etc. called when the render
// is considered complete
window.Render.prototype.endRenderPass = function() {

  // check to see if there's eny entities we haven't seen. if so, delete them
  for (var guid in window.portals) {
    // special case for selected portal - it's kept even if not seen
    if (!(guid in this.seenPortalsGuid) && guid !== selectedPortal) {
      this.deletePortalEntity(guid);
    }
  }
  for (var guid in window.links) {
    if (!(guid in this.seenLinksGuid)) {
      this.deleteLinkEntity(guid);
    }
  }
  for (var guid in window.fields) {
    if (!(guid in this.seenFieldsGuid)) {
      this.deleteFieldEntity(guid);
    }
  }

  // reorder portals to be after links/fields
  this.bringPortalsToFront();

  this.isRendering = false;
}

window.Render.prototype.bringPortalsToFront = function() {
  for (var lvl in portalsFactionLayers) {
    // portals are stored in separate layers per faction
    // to avoid giving weight to one faction or another, we'll push portals to front based on GUID order
    var lvlPortals = {};
    for (var fac in portalsFactionLayers[lvl]) {
      var layer = portalsFactionLayers[lvl][fac];
      if (layer._map) {
        layer.eachLayer (function(p) {
          lvlPortals[p.options.guid] = p;
        });
      }
    }

    var guids = Object.keys(lvlPortals);
    guids.sort();

    for (var j in guids) {
      var guid = guids[j];
      lvlPortals[guid].bringToFront();
    }
  }

  // artifact portals are always brought to the front, above all others
  $.each(artifact.getInterestingPortals(), function(i,guid) {
    if (portals[guid] && portals[guid]._map) {
      portals[guid].bringToFront();
    }
  });

}


window.Render.prototype.deleteEntity = function(guid) {
  this.deletePortalEntity(guid);
  this.deleteLinkEntity(guid);
  this.deleteFieldEntity(guid);
}

window.Render.prototype.deletePortalEntity = function(guid) {
  if (guid in window.portals) {
    var p = window.portals[guid];
    this.removePortalFromMapLayer(p);
    delete window.portals[guid];
  }
}

window.Render.prototype.deleteLinkEntity = function(guid) {
  if (guid in window.links) {
    var l = window.links[guid];
    if (linksFactionLayers[l.options.team].hasLayer(l)) {
      linksFactionLayers[l.options.team].removeLayer(l);
    }
    delete window.links[guid];
  }
}


window.Render.prototype.deleteFieldEntity = function(guid) {
  if (guid in window.fields) {
    var f = window.fields[guid];
    var fd = f.options.details;

    var deletePortalLinkedField = function(pguid) {
      if (pguid in window.portals) {
        var pd = window.portals[pguid].options.details;
        if (pd.portalV2.linkedFields) {
          var i = pd.portalV2.linkedFields.indexOf(guid);
          if (i >= 0) {
            pd.portalV2.linkedFields.splice(i,1);
          }
        }
      }
    }

    deletePortalLinkedField (fd.capturedRegion.vertexA.guid);
    deletePortalLinkedField (fd.capturedRegion.vertexB.guid);
    deletePortalLinkedField (fd.capturedRegion.vertexC.guid);

    fieldsFactionLayers[f.options.team].removeLayer(f);
    delete window.fields[guid];
  }
}


window.Render.prototype.createEntity = function(ent) {

  // ent[0] == guid
  // ent[1] == mtime
  // ent[2] == data


  // logic on detecting entity type based on the stock site javascript.
  if ("portalV2" in ent[2]) {
    this.createPortalEntity(ent);
  } else if ("capturedRegion" in ent[2]) {
    this.createFieldEntity(ent);
  } else if ("edge" in ent[2]) {
    this.createLinkEntity(ent);
  } else {
    console.warn("Unknown entity found: "+JSON.stringify(ent));
  }

}


window.Render.prototype.createPortalEntity = function(ent) {
  this.seenPortalsGuid[ent[0]] = true;  // flag we've seen it

  var previousDetails = undefined;

  // check if entity already exists
  if (ent[0] in window.portals) {
    // yes. now check to see if the entity data we have is newer than that in place
    var p = window.portals[ent[0]];

    if (p.options.timestamp >= ent[1]) return; // this data is identical or older - abort processing

    // the data we have is newer. many data changes require re-rendering of the portal
    // (e.g. level changed, so size is different, or stats changed so highlighter is different)
    // so to keep things simple we'll always re-create the entity in this case

    // remember the old details, for the callback

    previousDetails = p.options.details;

    this.deletePortalEntity(ent[0]);
  }

  var portalLevel = getPortalLevel(ent[2]);
  var team = getTeam(ent[2]);

  var latlng = L.latLng(ent[2].locationE6.latE6/1E6, ent[2].locationE6.lngE6/1E6);

//TODO: move marker creation, style setting, etc into a separate class
//(as it's called from elsewhere - e.g. selecting/deselecting portals)

//ALSO: change API for highlighters - make them return the updated style rather than directly calling setStyle on the portal marker
//(can this be done in a backwardly-compatible way??)

  var dataOptions = {
    level: portalLevel,
    team: team,
    ent: ent,  // LEGACY - TO BE REMOVED AT SOME POINT! use .guid, .timestamp and .details instead
    guid: ent[0],
    timestamp: ent[1],
    details: ent[2]
  };

  // Javascript uses references for objects. For now, at least, we need to modify the data within
  // the options.details.portalV2 (to add in linkedFields). To avoid tainting the original data (which may be cached)
  // we'll shallow-copy these items
  dataOptions.details = $.extend({}, dataOptions.details);
  dataOptions.details.portalV2 = $.extend({}, dataOptions.details.portalV2);


  // create a linkedFields entry and add it to details - various bits of code assumes it will exist
  for (var fguid in window.fields) {
    var fd = window.fields[fguid].options.details;
    if ( fd.capturedRegion.vertexA.guid == ent[0] || fd.capturedRegion.vertexB.guid == ent[0] || fd.capturedRegion.vertexC.guid == ent[0]) {
      if (!dataOptions.details.portalV2.linkedFields) dataOptions.details.portalV2.linkedFields = [];
      dataOptions.details.portalV2.linkedFields.push(fguid);
    }
  }

  var marker = createMarker(latlng, dataOptions);

  marker.on('click', function() { window.renderPortalDetails(ent[0]); });
  marker.on('dblclick', function() { window.renderPortalDetails(ent[0]); window.map.setView(latlng, 17); });


  window.runHooks('portalAdded', {portal: marker, previousDetails: previousDetails});

  window.portals[ent[0]] = marker;

  // check for URL links to portal, and select it if this is the one
  if (urlPortalLL && urlPortalLL[0] == marker.getLatLng().lat && urlPortalLL[1] == marker.getLatLng().lng) {
    // URL-passed portal found via pll parameter - set the guid-based parameter
    console.log('urlPortalLL '+urlPortalLL[0]+','+urlPortalLL[1]+' matches portal GUID '+ent[0]);

    urlPortal = ent[0];
    urlPortalLL = undefined;  // clear the URL parameter so it's not matched again
  }
  if (urlPortal == ent[0]) {
    // URL-passed portal found via guid parameter - set it as the selected portal
    console.log('urlPortal GUID '+urlPortal+' found - selecting...');
    selectedPortal = ent[0];
    urlPortal = undefined;  // clear the URL parameter so it's not matched again
  }

  // (re-)select the portal, to refresh the sidebar on any changes
  if (ent[0] == selectedPortal) {
    console.log('portal guid '+ent[0]+' is the selected portal - re-rendering portal details');
    renderPortalDetails (selectedPortal);
  }

  //TODO? postpone adding to the map layer
  this.addPortalToMapLayer(marker);

}


window.Render.prototype.createFieldEntity = function(ent) {
  this.seenFieldsGuid[ent[0]] = true;  // flag we've seen it

  // check if entity already exists
  if(ent[0] in window.fields) {
    // yes. in theory, we should never get updated data for an existing field. they're created, and they're destroyed - never changed
    // but theory and practice may not be the same thing...
    var f = window.fields[ent[0]];

    if (f.options.timestamp >= ent[1]) return; // this data is identical (or order) than that rendered - abort processing

    // the data we have is newer - two options
    // 1. just update the data, assume the field render appearance is unmodified
    // 2. delete the entity, then re-create with the new data
    this.deleteFieldEntity(ent[0]); // option 2, for now
  }

  var team = getTeam(ent[2]);
  var reg = ent[2].capturedRegion;
  var latlngs = [
    L.latLng(reg.vertexA.location.latE6/1E6, reg.vertexA.location.lngE6/1E6),
    L.latLng(reg.vertexB.location.latE6/1E6, reg.vertexB.location.lngE6/1E6),
    L.latLng(reg.vertexC.location.latE6/1E6, reg.vertexC.location.lngE6/1E6)
  ];

  var poly = L.geodesicPolygon(latlngs, {
    fillColor: COLORS[team],
    fillOpacity: 0.25,
    stroke: false,
    clickable: false,

    team: team,
    guid: ent[0],
    timestamp: ent[1],
    details: ent[2],
    // LEGACY FIELDS: these duplicate data available via .details, as IITC previously stored it in data and vertices
    data: ent[2],
    vertices: ent[2].capturedRegion
  });


  // now fill in any references portals linkedFields data
  var addPortalLinkedField = function(pguid) {
    if (pguid in window.portals) {
      var pd = window.portals[pguid].options.details;
      if (!pd.portalV2.linkedFields) pd.portalV2.linkedFields = [];
      if (pd.portalV2.linkedFields.indexOf(pguid) <0 ) {
        pd.portalV2.linkedFields.push (ent[0]);
      }
    }
  }
  addPortalLinkedField(ent[2].capturedRegion.vertexA.guid);
  addPortalLinkedField(ent[2].capturedRegion.vertexB.guid);
  addPortalLinkedField(ent[2].capturedRegion.vertexC.guid);

  runHooks('fieldAdded',{field: poly});

  window.fields[ent[0]] = poly;

  // TODO? postpone adding to the layer??
  fieldsFactionLayers[poly.options.team].addLayer(poly);
}

window.Render.prototype.createLinkEntity = function(ent,faked) {
  this.seenLinksGuid[ent[0]] = true;  // flag we've seen it

  // check if entity already exists
  if (ent[0] in window.links) {
    // yes. now, as sometimes links are 'faked', they have incomplete data. if the data we have is better, replace the data
    var l = window.links[ent[0]];

    // the faked data will have older timestamps than real data (currently, faked set to zero)
    if (l.options.timestamp >= ent[1]) return; // this data is older or identical to the rendered data - abort processing

    // the data is newer/better - two options
    // 1. just update the data. assume the link render appearance is unmodified
    // 2. delete the entity, then re-create it with the new data
    this.deleteLinkEntity(ent[0]); // option 2 - for now
  }

  var team = getTeam(ent[2]);
  var edge = ent[2].edge;
  var latlngs = [
    L.latLng(edge.originPortalLocation.latE6/1E6, edge.originPortalLocation.lngE6/1E6),
    L.latLng(edge.destinationPortalLocation.latE6/1E6, edge.destinationPortalLocation.lngE6/1E6)
  ];
  var poly = L.geodesicPolyline(latlngs, {
    color: COLORS[team],
    opacity: 1,
    weight: faked ? 1 : 2,
    clickable: false,

    team: team,
    guid: ent[0],
    timestamp: ent[1],
    details: ent[2],
    // LEGACY FIELDS: these duplicate data available via .details, as IITC previously stored it in data and vertices
    data: ent[2]
  });

  runHooks('linkAdded', {link: poly});

  window.links[ent[0]] = poly;

  // only add the link to the layer if it's long enough to be seen

  if (this.linkVisible(poly)) {
    linksFactionLayers[poly.options.team].addLayer(poly);
  }
}


window.Render.prototype.createLinksFromPortalData = function(portalGuid) {

  var sourcePortal = portals[portalGuid];

  for (var sourceLinkIndex in sourcePortal.options.details.portalV2.linkedEdges||[]) {
    var sourcePortalLinkInfo = sourcePortal.options.details.portalV2.linkedEdges[sourceLinkIndex];

    // portals often contain details for edges that don't exist. so only consider faking an edge if this
    // is the origin portal
    if (sourcePortalLinkInfo.isOrigin) {

      // ... and the other porta has matching link information. 
      if (sourcePortalLinkInfo.otherPortalGuid in portals) {

        var targetPortal = portals[sourcePortalLinkInfo.otherPortalGuid];

        for (var targetLinkIndex in targetPortal.options.details.portalV2.linkedEdges||[]) {
          var targetPortalLinkInfo = targetPortal.options.details.portalV2.linkedEdges[targetLinkIndex];

          if (targetPortalLinkInfo.edgeGuid == sourcePortalLinkInfo.edgeGuid) {
            // yes - edge in both portals. create it

            var fakeEnt = [
              sourcePortalLinkInfo.edgeGuid,
              0,  // mtime for entity data - unknown when faking it, so zero will be the oldest possible
              {
                controllingTeam: sourcePortal.options.details.controllingTeam,
                edge: {
                  originPortalGuid: portalGuid,
                  originPortalLocation: sourcePortal.options.details.locationE6,
                  destinationPortalGuid: sourcePortalLinkInfo.otherPortalGuid,
                  destinationPortalLocation: targetPortal.options.details.locationE6
                }
              }
            ];

            this.createLinkEntity(fakeEnt,true);


          }

        }

      }
      
    }

  }
}


window.Render.prototype.updateEntityVisibility = function() {
  if (this.entityVisibilityZoom === undefined || this.entityVisibilityZoom != map.getZoom()) {
    this.entityVisibilityZoom = map.getZoom();

    this.resetPortalClusters();
    this.resetLinkVisibility();
  }
}



// portal clustering functionality

window.Render.prototype.resetPortalClusters = function() {

  this.portalClusters = {};

  // first, place the portals into the clusters
  for (var pguid in window.portals) {
    var p = window.portals[pguid];
    var cid = this.getPortalClusterID(p);

    if (!(cid in this.portalClusters)) this.portalClusters[cid] = [];

    this.portalClusters[cid].push(p.options.guid);
  }

  // now, for each cluster, sort by some arbitrary data (the guid will do), and display the first CLUSTER_PORTAL_LIMIT
  for (var cid in this.portalClusters) {
    var c = this.portalClusters[cid];

    c.sort();

    for (var i=0; i<c.length; i++) {
      var guid = c[i];
      var p = window.portals[guid];
      var layerGroup = portalsFactionLayers[parseInt(p.options.level)][p.options.team];
      if (i<this.CLUSTER_PORTAL_LIMIT || p.options.guid == selectedPortal || artifact.isInterestingPortal(p.options.guid)) {
        if (!layerGroup.hasLayer(p)) {
          layerGroup.addLayer(p);
        }
      } else {
        if (layerGroup.hasLayer(p)) {
          layerGroup.removeLayer(p);
        }
      }
    }
  }

}

// add the portal to the visiable map layer unless we pass the cluster limits
window.Render.prototype.addPortalToMapLayer = function(portal) {

  var cid = this.getPortalClusterID(portal);

  if (!(cid in this.portalClusters)) this.portalClusters[cid] = [];

  this.portalClusters[cid].push(portal.options.guid);

  // now, at this point, we could match the above re-clustr code - sorting, and adding/removing as necessary
  // however, it won't make a lot of visible difference compared to just pushing to the end of the list, then
  // adding to the visible layer if the list is below the limit
  if (this.portalClusters[cid].length < this.CLUSTER_PORTAL_LIMIT || portal.options.guid == selectedPortal || artifact.isInterestingPortal(portal.options.guid)) {
    portalsFactionLayers[parseInt(portal.options.level)][portal.options.team].addLayer(portal);
  }
}

window.Render.prototype.removePortalFromMapLayer = function(portal) {

  //remove it from the portalsLevels layer
  portalsFactionLayers[parseInt(portal.options.level)][portal.options.team].removeLayer(portal);

  // and ensure there's no mention of the portal in the cluster list
  var cid = this.getPortalClusterID(portal);

  if (cid in this.portalClusters) {
    var index = this.portalClusters[cid].indexOf(portal.options.guid);
    if (index >= 0) {
      this.portalClusters[cid].splice(index,1);
      // FIXME? if this portal was in on the screen (in the first 10), and we still have 10+ portals, add the new 10to to the screen?
    }
  }
}

window.Render.prototype.getPortalClusterID = function(portal) {
  // project the lat/lng into absolute map pixels
  var z = map.getZoom();

  var point = map.project(portal.getLatLng(), z);

  var clusterpoint = point.divideBy(this.CLUSTER_SIZE).round();

  return z+":"+clusterpoint.x+":"+clusterpoint.y;
}


// link length

window.Render.prototype.getLinkPixelLength = function(link) {
  var z = map.getZoom();

  var latLngs = link.getLatLngs();
  if (latLngs.length != 2) {
    console.warn ('Link had '+latLngs.length+' points - expected 2!');
    return undefined;
  }

  var point0 = map.project(latLngs[0]);
  var point1 = map.project(latLngs[1]);

  var dx = point0.x - point1.x;
  var dy = point0.y - point1.y;

  var lengthSquared = (dx*dx)+(dy*dy);

  var length = Math.sqrt (lengthSquared);

  return length;
}


window.Render.prototype.linkVisible = function(link) {
  var length = this.getLinkPixelLength (link);

  return length >= this.LINK_VISIBLE_PIXEL_LENGTH;
}


window.Render.prototype.resetLinkVisibility = function() {

  for (var guid in window.links) {
    var link = window.links[guid];

    var visible = this.linkVisible(link);

    if (visible) {
      if (!linksFactionLayers[link.options.team].hasLayer(link)) linksFactionLayers[link.options.team].addLayer(link);
    } else {
      if (linksFactionLayers[link.options.team].hasLayer(link)) linksFactionLayers[link.options.team].removeLayer(link);
    }
  }
}