// version: 2014-08-16
/**
 * o--------------------------------------------------------------------------------o
 * | This file is part of the RGraph package - you can learn more at:               |
 * |                                                                                |
 * |                          http://www.rgraph.net                                 |
 * |                                                                                |
 * | This package is licensed under the Creative Commons BY-NC license. That means  |
 * | that for non-commercial purposes it's free to use and for business use there's |
 * | a 99 GBP per-company fee to pay. You can read the full license here:           |
 * |                                                                                |
 * |                      http://www.rgraph.net/license                             |
 * o--------------------------------------------------------------------------------o
 */

/**
 * Initialise the various objects
 */
RGraph = window.RGraph || {isRGraph: true};


RGraph.CSV = function (url, func) {
    var RG = RGraph,
        ua = navigator.userAgent,
        ma = Math;


    /**
     * Some default values
     */
    this.url = url;
    this.ready = func;
    this.data = null;
    this.numrows = null;
    this.numcols = null;
    this.seperator = arguments[2] || ',';
    this.endofline = arguments[3] || /\r?\n/;


    /**
     * This function splits the CSV data into an array so that it can be useful.
     */
    this.fetch = function () {
        var sep = this.seperator;
        var eol = this.endofline;
        var obj = this;

        if (this.url.substring(0, 3) == 'id:') {

            // Get rid of any trailing slash
            var data = document.getElementById(this.url.substring(3)).innerHTML.replace(/(\r?\n)+$/, '');

            // Store the CSV data on the CSV object (ie - this object)
            obj.data = data.split(eol);

            // Store the number of rows
            obj.numrows = obj.data.length;

            for (var i = 0, len = obj.data.length; i < len; i += 1) {


                var row = obj.data[i].split(sep);

                if (!obj.numcols) {
                    obj.numcols = row.length;
                }

                /**
                 * If the cell is purely made up of numbers - convert it
                 */
                for (var j = 0; j < row.length; j += 1) {
                    if ((/^[0-9.]+$/).test(row[j])) {
                        row[j] = parseFloat(row[j]);
                    }

                    // Assign the split-up-row back to the data array
                    obj.data[i] = row;
                }
            }

            // Call the ready function straight away
            obj.ready(obj);

        } else {

            RGraph.AJAX.getString(this.url, function (data) {
                data = data.replace(/(\r?\n)+$/, '');
                obj.data = data.split(eol);

                // Store the number of rows
                obj.numrows = obj.data.length;

                for (var i = 0, len = obj.data.length; i < len; i += 1) {


                    var row = obj.data[i].split(sep);

                    if (!obj.numcols) {
                        obj.numcols = row.length;
                    }

                    /**
                     * If the cell is purely made up of numbers - convert it
                     */
                    for (var j = 0; j < row.length; j += 1) {
                        if ((/^\-?[0-9.]+$/).test(row[j])) {
                            row[j] = parseFloat(row[j]);
                        }

                        // Assign the split-up-row back to the data array
                        obj.data[i] = row;
                    }

                }

                // Call the ready function straight away
                obj.ready(obj);
            });
        }
    }


    /**
     * Returns a row of the CSV file
     *
     * @param number index The index of the row to fetch
     * @param        start OPTIONAL If desired you can specify a column to start at (which starts at 0 by default)
     */
    this.getRow = function (index) {
        var row = [];
        var start = arguments[1] || 0;

        for (var i = start; i < this.numcols; i += 1) {
            row.push(this.data[index][i]);
        }

        return row;
    }


    /**
     * Returns a column of the CSV file
     *
     * @param number index The index of the column to fetch
     * @param        start OPTIONAL If desired you can specify a row to start at (which starts at 0 by default)
     */
    this.getCol =
        this.getColumn = function (index) {
            var col = [];
            var start = arguments[1] || 0;

            for (var i = start; i < this.numrows; i += 1) {
                col.push(this.data[i][index]);
            }

            return col;
        }


    // Fetch the CSV file
    this.fetch();
};