var GRID_CONTROLS_HTML_URL = Script.resolvePath('../html/gridControls.html');

Grid = function(opts) {
    var that = {};
    var gridColor = { red: 0, green: 0, blue: 0 };
    var gridAlpha = 0.6;
    var origin = { x: 0, y: +MyAvatar.getJointPosition('LeftToeBase').y.toFixed(1) + 0.1, z: 0 };
    var scale = 500;
    var minorGridEvery = 1.0;
    var majorGridEvery = 5;
    var halfSize = 40;

    var worldSize = 16384;

    var snapToGrid = false;

    var gridOverlay = Overlays.addOverlay("grid", {
        rotation: Quat.fromPitchYawRollDegrees(90, 0, 0),
        dimensions: { x: scale, y: scale, z: scale },
        position: origin,
        visible: false,
        drawInFront: false,
        color: gridColor,
        alpha: gridAlpha,
        minorGridEvery: minorGridEvery,
        majorGridEvery: majorGridEvery
    });

    that.visible = false;
    that.enabled = false;

    that.getOrigin = function() {
        return origin;
    };

    that.getMinorIncrement = function() {
        return minorGridEvery;
    };

    that.setMinorIncrement = function(value) {
        minorGridEvery = value;
        updateGrid();
    };

    that.getMajorIncrement = function() {
        return majorGridEvery;
    };

    that.setMajorIncrement = function(value) {
        majorGridEvery = value;
        updateGrid();
    };

    that.getColor = function() {
        return gridColor;
    };

    that.setColor = function(value) {
        gridColor = value;
        updateGrid();
    };

    that.getSnapToGrid = function() {
        return snapToGrid;
    };
    that.setSnapToGrid = function(value) {
        snapToGrid = value;
        that.emitUpdate();
    };

    that.setEnabled = function(enabled) {
        that.enabled = enabled;
        updateGrid();
    };

    that.getVisible = function() { 
        return that.visible; 
    };
    that.setVisible = function(visible, noUpdate) {
        that.visible = visible;
        updateGrid();

        if (!noUpdate) {
            that.emitUpdate();
        }
    };

    that.snapToSurface = function(position, dimensions, registration) {
        if (!snapToGrid) {
            return position;
        }

        if (dimensions === undefined) {
            dimensions = { x: 0, y: 0, z: 0 };
        }

        if (registration === undefined) {
            registration = { x: 0.5, y: 0.5, z: 0.5 };
        }

        return {
            x: position.x,
            y: origin.y + (registration.y * dimensions.y),
            z: position.z
        };
    };

    that.snapToGrid = function(position, majorOnly, dimensions, registration) {
        if (!snapToGrid) {
            return position;
        }

        if (dimensions === undefined) {
            dimensions = { x: 0, y: 0, z: 0 };
        }

        if (registration === undefined) {
            registration = { x: 0.5, y: 0.5, z: 0.5 };
        }

        var spacing = majorOnly ? majorGridEvery : minorGridEvery;

        position = Vec3.subtract(position, origin);

        position.x = Math.round(position.x / spacing) * spacing;
        position.y = Math.round(position.y / spacing) * spacing;
        position.z = Math.round(position.z / spacing) * spacing;

        return Vec3.sum(Vec3.sum(position, Vec3.multiplyVbyV(registration, dimensions)), origin);
    };

    that.snapToSpacing = function(delta, majorOnly) {
        if (!snapToGrid) {
            return delta;
        }

        var spacing = majorOnly ? majorGridEvery : minorGridEvery;

        var snappedDelta = {
            x: Math.round(delta.x / spacing) * spacing,
            y: Math.round(delta.y / spacing) * spacing,
            z: Math.round(delta.z / spacing) * spacing
        };

        return snappedDelta;
    };


    that.setPosition = function(newPosition, noUpdate) {
        origin = { x: 0, y: newPosition.y, z: 0 };
        updateGrid();

        if (!noUpdate) {
            that.emitUpdate();
        }
    };

    that.emitUpdate = function() {
        if (that.onUpdate) {
            that.onUpdate({
                origin: origin,
                minorGridEvery: minorGridEvery,
                majorGridEvery: majorGridEvery,
                gridSize: halfSize,
                visible: that.visible,
                snapToGrid: snapToGrid
            });
        }
    };

    that.update = function(data) {
        if (data.snapToGrid !== undefined) {
            snapToGrid = data.snapToGrid;
        }

        if (data.origin) {
            var pos = data.origin;
            pos.x = pos.x === undefined ? origin.x : parseFloat(pos.x);
            pos.y = pos.y === undefined ? origin.y : parseFloat(pos.y);
            pos.z = pos.z === undefined ? origin.z : parseFloat(pos.z);
            that.setPosition(pos, true);
        }

        if (data.minorGridEvery) {
            minorGridEvery = data.minorGridEvery;
        }

        if (data.majorGridEvery) {
            majorGridEvery = data.majorGridEvery;
        }

        if (data.gridColor) {
            gridColor = data.gridColor;
        }

        if (data.gridSize) {
            halfSize = data.gridSize;
        }

        if (data.visible !== undefined) {
            that.setVisible(data.visible, true);
        }

        updateGrid(true);
    };

    function updateGrid(noUpdate) {
        Overlays.editOverlay(gridOverlay, {
            position: { x: 0, y: origin.y, z: 0 },
            visible: that.visible && that.enabled,
            minorGridEvery: minorGridEvery,
            majorGridEvery: majorGridEvery,
            color: gridColor,
            alpha: gridAlpha
        });

        if (!noUpdate) {
            that.emitUpdate();
        }
    }

    function cleanup() {
        Overlays.deleteOverlay(gridOverlay);
    }

    that.addListener = function(callback) {
        that.onUpdate = callback;
    };

    Script.scriptEnding.connect(cleanup);
    updateGrid();

    that.onUpdate = null;

    return that;
};

GridTool = function(opts) {
    var that = {};

    var horizontalGrid = opts.horizontalGrid;
    var verticalGrid = opts.verticalGrid;
    var createToolsWindow = opts.createToolsWindow;
    var listeners = [];

    var webView = null;
    webView = Tablet.getTablet("com.highfidelity.interface.tablet.system");
    webView.setVisible = function(value) { };

    horizontalGrid.addListener(function(data) {
        var dataString = JSON.stringify(data);
        webView.emitScriptEvent(dataString);
        createToolsWindow.emitScriptEvent(dataString);
        if (selectionDisplay) {
            selectionDisplay.updateHandles();
        }
    });

    var webEventReceived = function(data) {
        try {
            data = JSON.parse(data);
        } catch (e) {
            print("gridTool.js: Error parsing JSON: " + e.name + " data " + data);
            return;
        }

        if (data.type == "init") {
            horizontalGrid.emitUpdate();
        } else if (data.type == "update") {
            horizontalGrid.update(data);
            for (var i = 0; i < listeners.length; i++) {
                listeners[i] && listeners[i](data);
            }
        } else if (data.type == "action") {
            var action = data.action;
            if (action == "moveToAvatar") {
                var position = MyAvatar.getJointPosition("LeftFoot");
                if (position.x == 0 && position.y == 0 && position.z == 0) {
                    position = MyAvatar.position;
                }
                horizontalGrid.setPosition(position);
            } else if (action == "moveToSelection") {
                var newPosition = selectionManager.worldPosition;
                newPosition = Vec3.subtract(newPosition, { x: 0, y: selectionManager.worldDimensions.y * 0.5, z: 0 });
                grid.setPosition(newPosition);
            }
        }
    };

    webView.webEventReceived.connect(webEventReceived);
    createToolsWindow.webEventReceived.addListener(webEventReceived);

    that.addListener = function(callback) {
        listeners.push(callback);
    };

    that.setVisible = function(visible) {
        webView.setVisible(HMD.active && visible);
    };

    return that;
};