/*
This file is part of Ext JS 4.2

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
*/
/**
 * @private
 */
Ext.define('Ext.chart.axis.Radial', {

    /* Begin Definitions */

    extend: 'Ext.chart.axis.Numeric',

    /* End Definitions */

    position: 'radial',

    alias: 'axis.radial',

    /**
     * @cfg {Number} maximum
     * The maximum value drawn by the axis. If not set explicitly, the axis
     * maximum will be calculated automatically.
     */

    /**
     * @cfg {Number} [steps=10]
     * The number of circles to draw outward from the center.
     */

    drawAxis: function(init) {
        var chart = this.chart,
            surface = chart.surface,
            bbox = chart.chartBBox,
            store = chart.getChartStore(),
            l = store.getCount(),
            centerX = bbox.x + (bbox.width / 2),
            centerY = bbox.y + (bbox.height / 2),
            rho = Math.min(bbox.width, bbox.height) /2,
            sprites = [], sprite,
            steps = this.steps,
            i, j, pi2 = Math.PI * 2,
            cos = Math.cos, sin = Math.sin;

        if (this.sprites && !chart.resizing) {
            this.drawLabel();
            return;
        }

        if (!this.sprites) {
            //draw circles
            for (i = 1; i <= steps; i++) {
                sprite = surface.add({
                    type: 'circle',
                    x: centerX,
                    y: centerY,
                    radius: Math.max(rho * i / steps, 0),
                    stroke: '#ccc'
                });
                sprite.setAttributes({
                    hidden: false
                }, true);
                sprites.push(sprite);
            }
            //draw lines
            for (i = 0; i < l; i++) {
                sprite = surface.add({
                    type: 'path',
                    path: ['M', centerX, centerY, 'L', centerX + rho * cos(i / l * pi2), centerY + rho * sin(i / l * pi2), 'Z'],
                    stroke: '#ccc'
                });
                sprite.setAttributes({
                    hidden: false
                }, true);
                sprites.push(sprite);
            }
        } else {
            sprites = this.sprites;
            //draw circles
            for (i = 0; i < steps; i++) {
                sprites[i].setAttributes({
                    x: centerX,
                    y: centerY,
                    radius: Math.max(rho * (i + 1) / steps, 0),
                    stroke: '#ccc'
                }, true);
            }
            //draw lines
            for (j = 0; j < l; j++) {
                sprites[i + j].setAttributes({
                    path: ['M', centerX, centerY, 'L', centerX + rho * cos(j / l * pi2), centerY + rho * sin(j / l * pi2), 'Z'],
                    stroke: '#ccc'
                }, true);
            }
        }
        this.sprites = sprites;

        this.drawLabel();
    },

    drawLabel: function() {
        var chart = this.chart,
            seriesItems = chart.series.items,
            series,
            surface = chart.surface,
            bbox = chart.chartBBox,
            store = chart.getChartStore(),
            data = store.data.items,
            ln, record,
            centerX = bbox.x + (bbox.width / 2),
            centerY = bbox.y + (bbox.height / 2),
            rho = Math.min(bbox.width, bbox.height) /2,
            max = Math.max, round = Math.round,
            labelArray = [], label,
            fields = [], nfields,
            categories = [], xField,
            aggregate = !this.maximum,
            maxValue = this.maximum || 0,
            steps = this.steps, i = 0, j, dx, dy,
            pi2 = Math.PI * 2,
            cos = Math.cos, sin = Math.sin,
            display = this.label.display,
            draw = display !== 'none',
            margin = 10;

        if (!draw) {
            return;
        }

        //get all rendered fields
        for (i = 0, ln = seriesItems.length; i < ln; i++) {
            series = seriesItems[i];
            fields.push(series.yField);
            xField = series.xField;
        }
        
        //get maxValue to interpolate
        for (j = 0, ln = data.length; j < ln; j++) {
            record = data[j];
            categories.push(record.get(xField));

            if (aggregate) {
                for (i = 0, nfields = fields.length; i < nfields; i++) {
                    maxValue = max(+record.get(fields[i]), maxValue);
                }
            }
        }
        if (!this.labelArray) {
            if (display != 'categories') {
                //draw scale
                for (i = 1; i <= steps; i++) {
                    label = surface.add({
                        type: 'text',
                        text: round(i / steps * maxValue),
                        x: centerX,
                        y: centerY - rho * i / steps,
                        'text-anchor': 'middle',
                        'stroke-width': 0.1,
                        stroke: '#333'
                    });
                    label.setAttributes({
                        hidden: false
                    }, true);
                    labelArray.push(label);
                }
            }
            if (display != 'scale') {
                //draw text
                for (j = 0, steps = categories.length; j < steps; j++) {
                    dx = cos(j / steps * pi2) * (rho + margin);
                    dy = sin(j / steps * pi2) * (rho + margin);
                    label = surface.add({
                        type: 'text',
                        text: categories[j],
                        x: centerX + dx,
                        y: centerY + dy,
                        'text-anchor': dx * dx <= 0.001? 'middle' : (dx < 0? 'end' : 'start')
                    });
                    label.setAttributes({
                        hidden: false
                    }, true);
                    labelArray.push(label);
                }
            }
        }
        else {
            labelArray = this.labelArray;
            if (display != 'categories') {
                //draw values
                for (i = 0; i < steps; i++) {
                    labelArray[i].setAttributes({
                        text: round((i + 1) / steps * maxValue),
                        x: centerX,
                        y: centerY - rho * (i + 1) / steps,
                        'text-anchor': 'middle',
                        'stroke-width': 0.1,
                        stroke: '#333'
                    }, true);
                }
            }
            if (display != 'scale') {
                //draw text
                for (j = 0, steps = categories.length; j < steps; j++) {
                    dx = cos(j / steps * pi2) * (rho + margin);
                    dy = sin(j / steps * pi2) * (rho + margin);
                    if (labelArray[i + j]) {
                        labelArray[i + j].setAttributes({
                            type: 'text',
                            text: categories[j],
                            x: centerX + dx,
                            y: centerY + dy,
                            'text-anchor': dx * dx <= 0.001? 'middle' : (dx < 0? 'end' : 'start')
                        }, true);
                    }
                }
            }
        }
        this.labelArray = labelArray;
    },

    getRange: function () {
        var range = this.callParent();
        range.min = 0;  // Radial charts currently assume that the origin is always 0.
        return range;
    },

    processView: function() {
        var me = this,
            seriesItems = me.chart.series.items,
            i, ln, series, ends, fields = [];

        for (i = 0, ln = seriesItems.length; i < ln; i++) {
            series = seriesItems[i];
            fields.push(series.yField);
        }
        me.fields = fields;

        ends = me.calcEnds();
        me.maximum = ends.to;
        me.steps = ends.steps;
    }
});