function selectEdgeOnClickHandler(adj, e) {
    if (Mconsole.busy) return;

    // catch right click on mac, which is often like ctrl+click
    if (navigator.platform.indexOf("Mac") != -1 && e.ctrlKey) {
        selectEdgeOnRightClickHandler(adj, e)
        return;
    }

    if (synapseWasDoubleClicked()) {
        synapseDoubleClickHandler(adj, e);
        return;
    }

    var edgeIsSelected = MetamapsModel.selectedEdges.indexOf(adj);
    if (edgeIsSelected == -1) edgeIsSelected = false;
    else if (edgeIsSelected != -1) edgeIsSelected = true;

    if (edgeIsSelected && e.shiftKey) {
        //deselecting an edge with shift
        deselectEdge(adj);
    } else if (!edgeIsSelected && e.shiftKey) {
        //selecting an edge with shift
        selectEdge(adj);
    } else if (edgeIsSelected && !e.shiftKey) {
        //deselecting an edge without shift - unselect all
        deselectAllEdges();
    } else if (!edgeIsSelected && !e.shiftKey) {
        //selecting an edge without shift - unselect all but new one
        deselectAllEdges();
        selectEdge(adj);
    }

    Mconsole.plot();
} //selectEdgeOnClickHandler

function selectEdgeOnRightClickHandler(adj, e) {
    // the 'node' variable is a JIT node, the one that was clicked on
    // the 'e' variable is the click event

    e.preventDefault();
    e.stopPropagation();

    if (Mconsole.busy) return;

    selectEdge(adj);

    // delete old right click menu
    $('.rightclickmenu').remove();
    // create new menu for clicked on node
    var rightclickmenu = document.createElement("div");
    rightclickmenu.className = "rightclickmenu";

    // add the proper options to the menu
    var menustring = '<ul>';

    if (userid != null) menustring += '<li class="rc-delete">Delete</li>';
    if (mapid && userid != null) menustring += '<li class="rc-remove">Remove from map</li>';
    menustring += '<li class="rc-hide">Hide until refresh</li>';
    if (userid) {
        var options = '<ul><li class="changeP toCommons">commons</li> \
                         <li class="changeP toPublic">public</li> \
                         <li class="changeP toPrivate">private</li> \
                     </ul>';

        menustring += '<li class="rc-permission">Change permissions' + options + '</li>';
    }

    menustring += '</ul>';
    rightclickmenu.innerHTML = menustring;

    // position the menu where the click happened
    $(rightclickmenu).css({
        left: e.clientX,
        top: e.clientY
    });
    //add the menu to the page
    $('#center-container').append(rightclickmenu);


    // attach events to clicks on the list items

    // delete the selected things from the database
    $('.rc-delete').click(function () {
        $('.rightclickmenu').remove();
        var n = MetamapsModel.selectedNodes.length;
        var e = MetamapsModel.selectedEdges.length;
        var ntext = n == 1 ? "1 topic" : n + " topics";
        var etext = e == 1 ? "1 synapse" : e + " synapses";
        var text = "You have " + ntext + " and " + etext + " selected. ";

        var r = confirm(text + "Are you sure you want to permanently delete them all? This will remove them from all maps they appear on.");
        if (r == true) {
            deleteSelectedEdges();
            deleteSelectedNodes();
        }
    });

    // remove the selected things from the map
    $('.rc-remove').click(function () {
        $('.rightclickmenu').remove();
        removeSelectedEdges();
        removeSelectedNodes();
    });

    // hide selected nodes and synapses until refresh
    $('.rc-hide').click(function () {
        $('.rightclickmenu').remove();
        hideSelectedEdges();
        hideSelectedNodes();
    });

    // change the permission of all the selected nodes and synapses that you were the originator of
    $('.rc-permission li').click(function () {
        $('.rightclickmenu').remove();
        // $(this).text() will be 'commons' 'public' or 'private'
        updateSelectedPermissions($(this).text());
    });

} //selectEdgeOnRightClickHandler


function synapseDoubleClickHandler(adj, e) {
    editEdge(adj, e);
}

/*
 * Returns a boolean saying if the synapse was double clicked in our understanding of the word
 */
function synapseWasDoubleClicked() {
    //grab the timestamp of the click 
    var storedTime = MetamapsModel.lastSynapseClick;
    var now = Date.now(); //not compatible with IE8 FYI 
    MetamapsModel.lastSynapseClick = now;

    if (now - storedTime < MetamapsModel.DOUBLE_CLICK_TOLERANCE) {
        return true;
    } else {
        return false;
    }
} //synapseWasDoubleClicked;

function nodeDoubleClickHandler(node, e) {
    openNodeShowcard(node);
}

function enterKeyHandler(event) {

    //var selectedNodesCopy = MetamapsModel.selectedNodes.slice(0);
    //var len = selectedNodesCopy.length;
    //for (var i = 0; i < len; i += 1) { 
    //  n = selectedNodesCopy[i]; 
    //  keepFromCommons(n);
    //}//for
    //Mconsole.plot();
} //enterKeyHandler

function escKeyHandler() {
    deselectAllEdges();
    deselectAllNodes();
} //escKeyHandler

/*
 * Make a node "in the commons" (with a green circle) lose its
 * green circle so it stays on the console/map/...
 */
function keepFromCommons(event, id) {
    if (userid == null) {
        return;
    }

    $('#topic_addSynapse').val("false");
    $('#topic_x').val(0);
    $('#topic_y').val(0);
    $('#topic_grabTopic').val(id);
    $('.new_topic').submit();

    event.preventDefault();
    event.stopPropagation();
    return false;
} //doubleClickNodeHandler

/*
 * Returns a boolean saying if the node was double clicked in our understanding of the word
 */
function nodeWasDoubleClicked() {
    //grab the timestamp of the click 
    var storedTime = MetamapsModel.lastNodeClick;
    var now = Date.now(); //not compatible with IE8 FYI 
    MetamapsModel.lastNodeClick = now;

    if (now - storedTime < MetamapsModel.DOUBLE_CLICK_TOLERANCE) {
        return true;
    } else {
        return false;
    }
} //nodeWasDoubleClicked;

function selectNodeOnClickHandler(node, e) {
    if (Mconsole.busy) return;

    // catch right click on mac, which is often like ctrl+click
    if (navigator.platform.indexOf("Mac") != -1 && e.ctrlKey) {
        selectNodeOnRightClickHandler(node, e)
        return;
    }

    // if on a topic page, let alt+click center you on a new topic
    if (!mapid && e.altKey) {
        centerOn(node.id);
        return;
    }

    var check = nodeWasDoubleClicked();
    if (check) {
        nodeDoubleClickHandler(node, e);
        return;
    } else {
        // wait a certain length of time, then check again, then run this code
        setTimeout(function () {
            if (!nodeWasDoubleClicked()) {
                if (!e.shiftKey) {
                    Mconsole.graph.eachNode(function (n) {
                        if (n.id != node.id) {
                            deselectNode(n);
                        }
                    });
                }
                if (node.selected) {
                    deselectNode(node);
                } else {
                    selectNode(node);
                }
                //trigger animation to final styles
                Mconsole.fx.animate({
                    modes: ['edge-property:lineWidth:color:alpha'],
                    duration: 500
                });
                Mconsole.plot();
            }
        }, MetamapsModel.DOUBLE_CLICK_TOLERANCE);
    }
} //selectNodeOnClickHandler

function selectNodeOnRightClickHandler(node, e) {
    // the 'node' variable is a JIT node, the one that was clicked on
    // the 'e' variable is the click event

    e.preventDefault();
    e.stopPropagation();

    if (Mconsole.busy) return;

    selectNode(node);

    // delete old right click menu
    $('.rightclickmenu').remove();
    // create new menu for clicked on node
    var rightclickmenu = document.createElement("div");
    rightclickmenu.className = "rightclickmenu";

    // add the proper options to the menu
    var menustring = '<ul>';

    if (userid != null) menustring += '<li class="rc-delete">Delete</li>';
    if (mapid && userid != null) menustring += '<li class="rc-remove">Remove from map</li>';
    menustring += '<li class="rc-hide">Hide until refresh</li>';

    if (!mapid) menustring += '<li class="rc-center">Center this topic</li>';
    menustring += '<li class="rc-popout">Open in new tab</li>';
    if (userid) {
        var options = '<ul><li class="changeP toCommons">commons</li> \
                         <li class="changeP toPublic">public</li> \
                         <li class="changeP toPrivate">private</li> \
                     </ul>';

        menustring += '<li class="rc-permission">Change permissions' + options + '</li>';
    }

    menustring += '</ul>';
    rightclickmenu.innerHTML = menustring;

    // position the menu where the click happened
    $(rightclickmenu).css({
        left: e.clientX,
        top: e.clientY
    });
    //add the menu to the page
    $('#center-container').append(rightclickmenu);


    // attach events to clicks on the list items

    // delete the selected things from the database
    $('.rc-delete').click(function () {
        $('.rightclickmenu').remove();
        var n = MetamapsModel.selectedNodes.length;
        var e = MetamapsModel.selectedEdges.length;
        var ntext = n == 1 ? "1 topic" : n + " topics";
        var etext = e == 1 ? "1 synapse" : e + " synapses";
        var text = "You have " + ntext + " and " + etext + " selected. ";

        var r = confirm(text + "Are you sure you want to permanently delete them all? This will remove them from all maps they appear on.");
        if (r == true) {
            deleteSelectedEdges();
            deleteSelectedNodes();
        }
    });

    // remove the selected things from the map
    $('.rc-remove').click(function () {
        $('.rightclickmenu').remove();
        removeSelectedEdges();
        removeSelectedNodes();
    });

    // hide selected nodes and synapses until refresh
    $('.rc-hide').click(function () {
        $('.rightclickmenu').remove();
        hideSelectedEdges();
        hideSelectedNodes();
    });

    // when in radial, center on the topic you picked
    $('.rc-center').click(function () {
        $('.rightclickmenu').remove();
        centerOn(node.id);
    });

    // open the entity in a new tab
    $('.rc-popout').click(function () {
        $('.rightclickmenu').remove();
        var win = window.open('/topics/' + node.id, '_blank');
        win.focus();
    });

    // change the permission of all the selected nodes and synapses that you were the originator of
    $('.rc-permission li').click(function () {
        $('.rightclickmenu').remove();
        // $(this).text() will be 'commons' 'public' or 'private'
        updateSelectedPermissions($(this).text());
    });

} //selectNodeOnRightClickHandler

function canvasDoubleClickHandler(canvasLoc, e) {

    //grab the location and timestamp of the click 
    var storedTime = MetamapsModel.lastCanvasClick;
    var now = Date.now(); //not compatible with IE8 FYI 
    MetamapsModel.lastCanvasClick = now;

    // if on a public map, disable topic creation
    if (userid && (mapperm || !mapid)) {
        if (now - storedTime < MetamapsModel.DOUBLE_CLICK_TOLERANCE) {
            //pop up node creation :) 
            $('#topic_grabTopic').val("null");
            $('#topic_addSynapse').val("false");
            $('#new_topic').css('left', e.clientX + "px");
            $('#new_topic').css('top', e.clientY + "px");
            $('#topic_x').val(canvasLoc.x);
            $('#topic_y').val(canvasLoc.y);
            $('#new_topic').fadeIn('fast');
            $('#topic_name').typeahead('setQuery', '').focus();
            return;
        }
    }

    if (!MetamapsModel.didPan) {
        $('#new_topic').fadeOut('fast');
        $('#new_synapse').fadeOut('fast');
        $('.rightclickmenu').remove();
        // reset the draw synapse positions to false
        MetamapsModel.synapseStartCoord = false;
        MetamapsModel.synapseEndCoord = false;
        deselectAllNodes();
        tempInit = false;
        tempNode = null;
        tempNode2 = null;
        Mconsole.plot();
    }
} //canvasDoubleClickHandler 

function handleSelectionBeforeDragging(node, e) {
    // four cases:
    // 1 nothing is selected, so pretend you aren't selecting
    // 2 others are selected only and shift, so additionally select this one
    // 3 others are selected only, no shift: drag only this one
    // 4 this node and others were selected, so drag them (just return false)
    //return value: deselect node again after?
    if (MetamapsModel.selectedNodes.length == 0) {
        selectNode(node);
        return 'deselect';
    }
    if (MetamapsModel.selectedNodes.indexOf(node) == -1) {
        if (e.shiftKey) {
            selectNode(node);
            return 'nothing';
        } else {
            return 'only-drag-this-one';
        }
    }
    return 'nothing'; //case 4?
}

function onDragMoveTopicHandler(node, eventInfo, e) {
    if (node && !node.nodeFrom) {
        $('#new_synapse').fadeOut('fast');
        $('#new_topic').fadeOut('fast');
        var pos = eventInfo.getPos();
        var newPosComplex = new $jit.Complex(pos.x, pos.y);
        // if it's a left click, or a touch, move the node
        if (e.touches || (e.button == 0 && !e.altKey && (e.buttons == 0 || e.buttons == 1 || e.buttons == undefined))) {
            //if the node dragged isn't already selected, select it
            var whatToDo = handleSelectionBeforeDragging(node, e);
            if (whatToDo == 'only-drag-this-one' || whatToDo == 'deselect') {
                if (gType == "centered") {
                    var rho = Math.sqrt(pos.x * pos.x + pos.y * pos.y);
                    var theta = Math.atan2(pos.y, pos.x);
                    node.pos.setp(theta, rho);
                } else {
                    node.setPos(newPosComplex, 'start');
                    node.setPos(newPosComplex, 'current');
                    node.setPos(newPosComplex, 'end');
                    node.setData('xloc', pos.x);
                    node.setData('yloc', pos.y);
                }
            } else {
                var len = MetamapsModel.selectedNodes.length;

                //first define offset for each node
                var xOffset = new Array();
                var yOffset = new Array();
                for (var i = 0; i < len; i += 1) {
                    var n = MetamapsModel.selectedNodes[i];
                    if (gType == "centered") {
                        xOffset[i] = n.pos.toComplex().x - node.pos.toComplex().x;
                        yOffset[i] = n.pos.toComplex().y - node.pos.toComplex().y;
                    } else {
                        xOffset[i] = n.pos.x - node.pos.x;
                        yOffset[i] = n.pos.y - node.pos.y;
                    }
                } //for

                for (var i = 0; i < len; i += 1) {
                    var n = MetamapsModel.selectedNodes[i];
                    if (gType == "centered") {
                        var x = pos.x + xOffset[i];
                        var y = pos.y + yOffset[i];
                        var rho = Math.sqrt(x * x + y * y);
                        var theta = Math.atan2(y, x);
                        n.pos.setp(theta, rho);
                    } else {
                        newPosComplex = new $jit.Complex(pos.x + xOffset[i], pos.y + yOffset[i]);
                        n.setPos(newPosComplex, 'start');
                        n.setPos(newPosComplex, 'current');
                        n.setPos(newPosComplex, 'end');
                        n.setData('xloc', pos.x + xOffset[i]);
                        n.setData('yloc', pos.y + yOffset[i]);
                    }
                } //for
            } //if

            if (whatToDo == 'deselect') {
                deselectNode(node);
            }
            dragged = node.id;
            Mconsole.plot();
        }
        // if it's a right click or holding down alt, start synapse creation  ->third option is for firefox
        else if ((e.button == 2 || (e.button == 0 && e.altKey) || e.buttons == 2) && userid != null) {

            // if on a public map, disable synapse creation
            if (mapid && !mapperm) return;

            if (tempInit == false) {
                tempNode = node;
                tempInit = true;
                // set the draw synapse start position
                MetamapsModel.synapseStartCoord = {
                    x: node.pos.getc().x,
                    y: node.pos.getc().y
                };
            }
            //
            temp = eventInfo.getNode();
            if (temp != false && temp.id != node.id) { // this means a Node has been returned
                tempNode2 = temp;

                // set the draw synapse end position
                MetamapsModel.synapseEndCoord = {
                    x: temp.pos.getc().x,
                    y: temp.pos.getc().y
                };

                Mconsole.plot();

                // before making the highlighted one bigger, make sure all the others are regular size
                Mconsole.graph.eachNode(function (n) {
                    n.setData('dim', 25, 'current');
                });
                temp.setData('dim', 35, 'current');
                Mconsole.fx.plotNode(tempNode, Mconsole.canvas);
                Mconsole.fx.plotNode(temp, Mconsole.canvas);
            } else if (!temp) {
                tempNode2 = null;
                Mconsole.graph.eachNode(function (n) {
                    n.setData('dim', 25, 'current');
                });
                //pop up node creation :)
                $('#topic_grabTopic').val("null");
                var myX = e.clientX - 110;
                var myY = e.clientY - 30;
                $('#new_topic').css('left', myX + "px");
                $('#new_topic').css('top', myY + "px");
                $('#new_synapse').css('left', myX + "px");
                $('#new_synapse').css('top', myY + "px");
                $('#topic_x').val(eventInfo.getPos().x);
                $('#topic_y').val(eventInfo.getPos().y);
                // set the draw synapse end position
                MetamapsModel.synapseEndCoord = {
                    x: eventInfo.getPos().x,
                    y: eventInfo.getPos().y
                };
                Mconsole.plot();
                Mconsole.fx.plotNode(tempNode, Mconsole.canvas);
            }
        }
    }
}

var lastDist = 0;

function getDistance(p1, p2) {
    return Math.sqrt(Math.pow((p2.x - p1.x), 2) + Math.pow((p2.y - p1.y), 2));
}

function touchPanZoomHandler(eventInfo, e) {
    if (e.touches.length == 1) {
        var thispos = touchPos,
            currentPos = eventInfo.getPos(),
            canvas = Mconsole.canvas,
            ox = canvas.translateOffsetX,
            oy = canvas.translateOffsetY,
            sx = canvas.scaleOffsetX,
            sy = canvas.scaleOffsetY;
        currentPos.x *= sx;
        currentPos.y *= sy;
        currentPos.x += ox;
        currentPos.y += oy;
        //var x = currentPos.x - thispos.x,
        //    y = currentPos.y - thispos.y;
        var x = currentPos.x - thispos.x,
            y = currentPos.y - thispos.y;
        touchPos = currentPos;
        Mconsole.canvas.translate(x * 1 / sx, y * 1 / sy);
    } else if (e.touches.length == 2) {
        var touch1 = e.touches[0];
        var touch2 = e.touches[1];

        var dist = getDistance({
            x: touch1.clientX,
            y: touch1.clientY
        }, {
            x: touch2.clientX,
            y: touch2.clientY
        });

        if (!lastDist) {
            lastDist = dist;
        }

        var scale = dist / lastDist;

        console.log(scale);

        if (8 >= Mconsole.canvas.scaleOffsetX * scale && Mconsole.canvas.scaleOffsetX * scale >= 1) {
            Mconsole.canvas.scale(scale, scale);
        }
        if (Mconsole.canvas.scaleOffsetX < 0.5) {
            Mconsole.canvas.viz.labels.hideLabels(true);
        } else if (Mconsole.canvas.scaleOffsetX > 0.5) {
            Mconsole.canvas.viz.labels.hideLabels(false);
        }
        lastDist = dist;
    }

}

function updateSelectedPermissions(permission) {


    if ($('.notice.metamaps').length == 0) {
        $('body').prepend('<div class="notice metamaps" />');
    }
    $('.notice.metamaps').hide().html('Working...').fadeIn('fast');

    // variables to keep track of how many nodes and synapses you had the ability to change the permission of
    var nCount = 0,
        sCount = 0;

    // change the permission of the selected synapses, if logged in user is the original creator
    var l = MetamapsModel.selectedEdges.length;
    for (var i = l - 1; i >= 0; i -= 1) {
        var edge = MetamapsModel.selectedEdges[i];

        if (edge.getData('userid') == userid) {
            updateSynapsePermission(edge, permission);
            sCount++;
        }
    }

    // change the permission of the selected topics, if logged in user is the original creator
    var l = MetamapsModel.selectedNodes.length;
    for (var i = l - 1; i >= 0; i -= 1) {
        var node = MetamapsModel.selectedNodes[i];

        if (node.getData('userid') == userid) {
            updateTopicPermission(node, permission);
            nCount++;
        }
    }

    var nString = nCount == 1 ? (nCount.toString() + ' topic and ') : (nCount.toString() + ' topics and ');
    var sString = sCount == 1 ? (sCount.toString() + ' synapse') : (sCount.toString() + ' synapses');

    $('.notice.metamaps').html(nString + sString + ' you created updated to ' + permission)
    setTimeout(function () {
        $('.notice.metamaps').fadeOut('fast');
    }, 8000);
}