/**
 * Provides base functionality for drawing chart axes.
 *
 * @module charts
 * @submodule axis
 */
var CONFIG = Y.config,
    DOCUMENT = CONFIG.doc,
    Y_Lang = Y.Lang,
    IS_STRING = Y_Lang.isString,
    Y_DOM = Y.DOM,
    LeftAxisLayout,
    RightAxisLayout,
    BottomAxisLayout,
    TopAxisLayout;
/**
 * Algorithmic strategy for rendering a left axis.
 *
 * @class LeftAxisLayout
 * @constructor
 * @submodule axis
 */
LeftAxisLayout = function() {};
 
LeftAxisLayout.prototype = {
    /**
     *  Default margins for text fields.
     *
     *  @private
     *  @method _getDefaultMargins
     *  @return Object
     */
    _getDefaultMargins: function()
    {
        return {
            top: 0,
            left: 0,
            right: 4,
            bottom: 0
        };
    },
 
    /**
     * Sets the length of the tick on either side of the axis line.
     *
     * @method setTickOffset
     * @protected
     */
    setTickOffsets: function()
    {
        var host = this,
            majorTicks = host.get("styles").majorTicks,
            tickLength = majorTicks.length,
            halfTick = tickLength * 0.5,
            display = majorTicks.display;
        host.set("topTickOffset",  0);
        host.set("bottomTickOffset",  0);
 
        switch(display)
        {
            case "inside" :
                host.set("rightTickOffset",  tickLength);
                host.set("leftTickOffset", 0);
            break;
            case "outside" :
                host.set("rightTickOffset", 0);
                host.set("leftTickOffset",  tickLength);
            break;
            case "cross":
                host.set("rightTickOffset", halfTick);
                host.set("leftTickOffset",  halfTick);
            break;
            default:
                host.set("rightTickOffset", 0);
                host.set("leftTickOffset", 0);
            break;
        }
    },
 
    /**
     * Draws a tick
     *
     * @method drawTick
     * @param {Path} path reference to the path `Path` element in which to draw the tick.
     * @param {Object} pt Point on the axis in which the tick will intersect.
     * @param {Object} tickStyle Hash of properties to apply to the tick.
     * @protected
     */
    drawTick: function(path, pt, tickStyles)
    {
        var host = this,
            style = host.get("styles"),
            padding = style.padding,
            tickLength = tickStyles.length,
            start = {x:padding.left, y:pt.y},
            end = {x:tickLength + padding.left, y:pt.y};
        host.drawLine(path, start, end);
    },
 
    /**
     * Calculates the coordinates for the first point on an axis.
     *
     * @method getLineStart
     * @return {Object}
     * @protected
     */
    getLineStart: function()
    {
        var style = this.get("styles"),
            padding = style.padding,
            majorTicks = style.majorTicks,
            tickLength = majorTicks.length,
            display = majorTicks.display,
            pt = {x:padding.left, y:0};
        if(display === "outside")
        {
            pt.x += tickLength;
        }
        else if(display === "cross")
        {
            pt.x += tickLength/2;
        }
        return pt;
    },
 
    /**
     * Calculates the point for a label.
     *
     * @method getLabelPoint
     * @param {Object} point Point on the axis in which the tick will intersect.
     * @return {Object}
     * @protected
     */
    getLabelPoint: function(point)
    {
        return {x:point.x - this.get("leftTickOffset"), y:point.y};
    },
 
    /**
     * Updates the value for the `maxLabelSize` for use in calculating total size.
     *
     * @method updateMaxLabelSize
     * @param {HTMLElement} label to measure
     * @protected
     */
    updateMaxLabelSize: function(labelWidth, labelHeight)
    {
        var host = this,
            props = this._labelRotationProps,
            rot = props.rot,
            absRot = props.absRot,
            sinRadians = props.sinRadians,
            cosRadians = props.cosRadians,
            max;
        if(rot === 0)
        {
            max = labelWidth;
        }
        else if(absRot === 90)
        {
            max = labelHeight;
        }
        else
        {
            max = (cosRadians * labelWidth) + (sinRadians * labelHeight);
        }
        host._maxLabelSize = Math.max(host._maxLabelSize, max);
    },
 
    /**
     * Determines the available label width when the axis width has been explicitly set.
     *
     * @method getExplicitlySized
     * @return Boolean
     * @protected
     */
    getExplicitlySized: function(styles)
    {
        if(this._explicitWidth)
        {
            var host = this,
                w = host._explicitWidth,
                totalTitleSize = host._totalTitleSize,
                leftTickOffset = host.get("leftTickOffset"),
                margin = styles.label.margin.right;
            host._maxLabelSize =  w - (leftTickOffset + margin + totalTitleSize);
            return true;
        }
        return false;
    },
 
    /**
     * Rotate and position title.
     *
     * @method positionTitle
     * @param {HTMLElement} label to rotate position
     * @protected
     */
    positionTitle: function(label)
    {
        var host = this,
            bounds = host._titleBounds,
            margin = host.get("styles").title.margin,
            props = host._titleRotationProps,
            w = bounds.right - bounds.left,
            labelWidth = label.offsetWidth,
            labelHeight = label.offsetHeight,
            x = (labelWidth * -0.5) + (w * 0.5),
            y = (host.get("height") * 0.5) - (labelHeight * 0.5);
        props.labelWidth = labelWidth;
        props.labelHeight = labelHeight;
        if(margin && margin.left)
        {
            x += margin.left;
        }
        props.x = x;
        props.y = y;
        props.transformOrigin = [0.5, 0.5];
        host._rotate(label, props);
    },
 
    /**
     * Rotate and position labels.
     *
     * @method positionLabel
     * @param {HTMLElement} label to rotate position
     * @param {Object} pt hash containing the x and y coordinates in which the label will be positioned
     * against.
     * @protected
     */
    positionLabel: function(label, pt, styles, i)
    {
        var host = this,
            tickOffset = host.get("leftTickOffset"),
            totalTitleSize = this._totalTitleSize,
            leftOffset = pt.x + totalTitleSize - tickOffset,
            topOffset = pt.y,
            props = this._labelRotationProps,
            rot = props.rot,
            absRot = props.absRot,
            maxLabelSize = host._maxLabelSize,
            labelWidth = this._labelWidths[i],
            labelHeight = this._labelHeights[i];
        if(rot === 0)
        {
            leftOffset -= labelWidth;
            topOffset -= labelHeight * 0.5;
        }
        else if(rot === 90)
        {
            leftOffset -= labelWidth * 0.5;
        }
        else if(rot === -90)
        {
            leftOffset -= labelWidth * 0.5;
            topOffset -= labelHeight;
        }
        else
        {
            leftOffset -= labelWidth + (labelHeight * absRot/360);
            topOffset -= labelHeight * 0.5;
        }
        props.labelWidth = labelWidth;
        props.labelHeight = labelHeight;
        props.x = Math.round(maxLabelSize + leftOffset);
        props.y = Math.round(topOffset);
        this._rotate(label, props);
    },
 
    /**
     * Adjusts the coordinates of an axis label based on the rotation.
     *
     * @method _setRotationCoords
     * @param {Object} props Coordinates, dimension and rotation properties of the label.
     * @protected
     */
    _setRotationCoords: function(props)
    {
        var rot = props.rot,
            absRot = props.absRot,
            leftOffset,
            topOffset,
            labelWidth = props.labelWidth,
            labelHeight = props.labelHeight;
        if(rot === 0)
        {
            leftOffset = labelWidth;
            topOffset = labelHeight * 0.5;
        }
        else if(rot === 90)
        {
            topOffset = 0;
            leftOffset = labelWidth * 0.5;
        }
        else if(rot === -90)
        {
            leftOffset = labelWidth * 0.5;
            topOffset = labelHeight;
        }
        else
        {
            leftOffset = labelWidth + (labelHeight * absRot/360);
            topOffset = labelHeight * 0.5;
        }
        props.x -= leftOffset;
        props.y -= topOffset;
    },
 
    /**
     * Returns the transformOrigin to use for an axis label based on the position of the axis
     * and the rotation of the label.
     *
     * @method _getTransformOrigin
     * @param {Number} rot The rotation (in degrees) of the label.
     * @return Array
     * @protected
     */
    _getTransformOrigin: function(rot)
    {
        var transformOrigin;
        if(rot === 0)
        {
            transformOrigin = [0, 0];
        }
        else if(rot === 90)
        {
            transformOrigin = [0.5, 0];
        }
        else if(rot === -90)
        {
            transformOrigin = [0.5, 1];
        }
        else
        {
            transformOrigin = [1, 0.5];
        }
        return transformOrigin;
    },
 
    /**
     * Adjust the position of the Axis widget's content box for internal axes.
     *
     * @method offsetNodeForTick
     * @param {Node} cb contentBox of the axis
     * @protected
     */
    offsetNodeForTick: function()
    {
    },
 
    /**
     * Sets the width of the axis based on its contents.
     *
     * @method setCalculatedSize
     * @protected
     */
    setCalculatedSize: function()
    {
        var host = this,
            graphic = this.get("graphic"),
            style = host.get("styles"),
            label = style.label,
            tickOffset = host.get("leftTickOffset"),
            max = host._maxLabelSize,
            totalTitleSize = this._totalTitleSize,
            ttl = Math.round(totalTitleSize + tickOffset + max + label.margin.right);
        if(this._explicitWidth)
        {
            ttl = this._explicitWidth;
        }
        this.set("calculatedWidth", ttl);
        graphic.set("x", ttl - tickOffset);
    }
};
 
Y.LeftAxisLayout = LeftAxisLayout;