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// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Chart series.
 *
 * @copyright  2016 Frédéric Massart - FMCorz.net
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @module     core/chart_series
 */
define([], function() {

/**
     * Chart data series.
     *
     * @class
     * @param {String} label The series label.
     * @param {Number[]} values The values.
     */
    function Series(label, values) {
        if (typeof label !== 'string') {
            throw new Error('Invalid label for series.');

} else if (typeof values !== 'object') {
            throw new Error('Values for a series must be an array.');

} else if (values.length < 1) {
            throw new Error('Invalid values received for series.');
        }

this._colors = [];
        this._label = label;
        this._values = values;
    }

/**
     * The default type of series.
     *
     * @type {Null}
     * @const
     */
    Series.prototype.TYPE_DEFAULT = null;

/**
     * Type of series 'line'.
     *
     * @type {String}
     * @const
     */
    Series.prototype.TYPE_LINE = 'line';

/**
     * The colors of the series.
     *
     * @type {String[]}
     * @protected
     */
    Series.prototype._colors = null;

/**
     * The fill mode of the series.
     *
     * @type {Object}
     * @protected
     */
    Series.prototype._fill = false;

/**
     * The label of the series.
     *
     * @type {String}
     * @protected
     */
    Series.prototype._label = null;

/**
     * The labels for the values of the series.
     *
     * @type {String[]}
     * @protected
     */
     Series.prototype._labels = null;

/**
     * Whether the line of the serie should be smooth or not.
     *
     * @type {Bool}
     * @protected
     */
    Series.prototype._smooth = false;

/**
     * The type of the series.
     *
     * @type {String}
     * @protected
     */
    Series.prototype._type = Series.prototype.TYPE_DEFAULT;

/**
     * The values in the series.
     *
     * @type {Number[]}
     * @protected
     */
    Series.prototype._values = null;

/**
     * The index of the X axis.
     *
     * @type {Number[]}
     * @protected
     */
    Series.prototype._xaxis = null;

/**
     * The index of the Y axis.
     *
     * @type {Number[]}
     * @protected
     */
    Series.prototype._yaxis = null;

/**
     * Create a new instance of a series from serialised data.
     *
     * @static
     * @method create
     * @param {Object} obj The data of the series.
     * @return {module:core/chart_series}
     */
    Series.prototype.create = function(obj) {
        var s = new Series(obj.label, obj.values);
        s.setType(obj.type);
        s.setXAxis(obj.axes.x);
        s.setYAxis(obj.axes.y);
        s.setLabels(obj.labels);

// Colors are exported as an array with 1, or n values.
        if (obj.colors && obj.colors.length > 1) {
            s.setColors(obj.colors);
        } else {
            s.setColor(obj.colors[0]);
        }

s.setFill(obj.fill);
        s.setSmooth(obj.smooth);
        return s;
    };

/**
     * Get the color.
     *
     * @return {String}
     */
    Series.prototype.getColor = function() {
        return this._colors[0] || null;
    };

/**
     * Get the colors for each value in the series.
     *
     * @return {String[]}
     */
    Series.prototype.getColors = function() {
        return this._colors;
    };

/**
     * Get the number of values in the series.
     *
     * @return {Number}
     */
    Series.prototype.getCount = function() {
        return this._values.length;
    };

/**
     * Get the fill mode of the series.
     *
     * @return {Object}
     */
    Series.prototype.getFill = function() {
      return this._fill;
    };

/**
     * Get the series label.
     *
     * @return {String}
     */
    Series.prototype.getLabel = function() {
        return this._label;
    };

/**
     * Get labels for the values of the series.
     *
     * @return {String[]}
     */
    Series.prototype.getLabels = function() {
        return this._labels;
    };

/**
     * Get whether the line of the serie should be smooth or not.
     *
     * @returns {Bool}
     */
    Series.prototype.getSmooth = function() {
        return this._smooth;
    };

/**
     * Get the series type.
     *
     * @return {String}
     */
    Series.prototype.getType = function() {
        return this._type;
    };

/**
     * Get the series values.
     *
     * @return {Number[]}
     */
    Series.prototype.getValues = function() {
        return this._values;
    };

/**
     * Get the index of the X axis.
     *
     * @return {Number}
     */
    Series.prototype.getXAxis = function() {
        return this._xaxis;
    };

/**
     * Get the index of the Y axis.
     *
     * @return {Number}
     */
    Series.prototype.getYAxis = function() {
        return this._yaxis;
    };

/**
     * Whether there is a color per value.
     *
     * @return {Bool}
     */
    Series.prototype.hasColoredValues = function() {
        return this._colors.length == this.getCount();
    };

/**
     * Set the series color.
     *
     * @param {String} color A CSS-compatible color.
     */
    Series.prototype.setColor = function(color) {
        this._colors = [color];
    };

/**
     * Set a color for each value in the series.
     *
     * @param {String[]} colors CSS-compatible colors.
     */
    Series.prototype.setColors = function(colors) {
        if (colors && colors.length != this.getCount()) {
            throw new Error('When setting multiple colors there must be one per value.');
        }
        this._colors = colors || [];
    };

/**
     * Set the fill mode for the series.
     *
     * @param {Object} fill
     */
    Series.prototype.setFill = function(fill) {
      this._fill = typeof fill === 'undefined' ? null : fill;
    };

/**
     * Set the labels for the values of the series.
     *
     * @param {String[]} labels the labels of the series values.
     */
    Series.prototype.setLabels = function(labels) {
        this._validateLabels(labels);
        labels = typeof labels === 'undefined' ? null : labels;
        this._labels = labels;
    };

/**
     * Set Whether the line of the serie should be smooth or not.
     *
     * Only applicable for line chart or a line series, if null it assumes the chart default (not smooth).
     *
     * @param {Bool} smooth True if the lines should be smooth, false for tensioned lines.
     */
    Series.prototype.setSmooth = function(smooth) {
        smooth = typeof smooth === 'undefined' ? null : smooth;
        this._smooth = smooth;
    };

/**
     * Set the type of the series.
     *
     * @param {String} type A type constant value.
     */
    Series.prototype.setType = function(type) {
        if (type != this.TYPE_DEFAULT && type != this.TYPE_LINE) {
            throw new Error('Invalid serie type.');
        }
        this._type = type || null;
    };

/**
     * Set the index of the X axis.
     *
     * @param {Number} index The index.
     */
    Series.prototype.setXAxis = function(index) {
        this._xaxis = index || null;
    };

/**
     * Set the index of the Y axis.
     *
     * @param {Number} index The index.
     */
    Series.prototype.setYAxis = function(index) {
        this._yaxis = index || null;
    };

/**
     * Validate series labels.
     *
     * @protected
     * @param {String[]} labels The labels of the serie.
     */
    Series.prototype._validateLabels = function(labels) {
        if (labels && labels.length > 0 && labels.length != this.getCount()) {
            throw new Error('Series labels must match series values.');
        }
    };

return Series;

});

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