/*! © SpryMedia Ltd, Jim Palmer, Michael Buehler, Mike Grier, Clint Priest, Kyle Adams, guillermo - datatables.net/license */

/**
 * Data can often be a complicated mix of numbers and letters (file names
 * are a common example) and sorting them in a natural manner is quite a
 * difficult problem.
 *
 * Fortunately a deal of work has already been done in this area by other
 * authors - the following plug-in uses the [naturalSort() function by Jim
 * Palmer](http://www.overset.com/2008/09/01/javascript-natural-sort-algorithm-with-unicode-support) to provide natural sorting in DataTables.
 *
 *  @name Natural sorting
 *  @summary Sort data with a mix of numbers and letters _naturally_.
 *  @author [Jim Palmer](http://www.overset.com/2008/09/01/javascript-natural-sort-algorithm-with-unicode-support)
 *  @author [Michael Buehler] (https://github.com/AnimusMachina)
 *
 *  @example
 *    $('#example').dataTable( {
 *       columnDefs: [
 *         { type: 'natural', targets: 0 }
 *       ]
 *    } );
 *
 *    Html can be stripped from sorting by using 'natural-nohtml' such as
 *
 *    $('#example').dataTable( {
 *       columnDefs: [
 *    	   { type: 'natural-nohtml', targets: 0 }
 *       ]
 *    } );
 *
 */

import DataTable from 'datatables.net';

/*
 * Natural Sort algorithm for Javascript - Version 0.7 - Released under MIT license
 * Author: Jim Palmer (based on chunking idea from Dave Koelle)
 * Contributors: Mike Grier (mgrier.com), Clint Priest, Kyle Adams, guillermo
 * See: http://js-naturalsort.googlecode.com/svn/trunk/naturalSort.js
 */
function naturalSort(a, b, html) {
	var re = /(^-?[0-9]+(\.?[0-9]*)[df]?e?[0-9]?%?$|^0x[0-9a-f]+$|[0-9]+)/gi,
		sre = /(^[ ]*|[ ]*$)/g,
		dre =
			/(^([\w ]+,?[\w ]+)?[\w ]+,?[\w ]+\d+:\d+(:\d+)?[\w ]?|^\d{1,4}[\/\-]\d{1,4}[\/\-]\d{1,4}|^\w+, \w+ \d+, \d{4})/,
		hre = /^0x[0-9a-f]+$/i,
		ore = /^0/,
		htmre = /(<([^>]+)>)/gi,
		// convert all to strings and trim()
		x = a.toString().replace(sre, '') || '',
		y = b.toString().replace(sre, '') || '';

	// remove html from strings if desired
	if (!html) {
		x = x.replace(htmre, '');
		y = y.replace(htmre, '');
	}
	// chunk/tokenize
	var xN = x
			.replace(re, '\0$1\0')
			.replace(/\0$/, '')
			.replace(/^\0/, '')
			.split('\0'),
		yN = y
			.replace(re, '\0$1\0')
			.replace(/\0$/, '')
			.replace(/^\0/, '')
			.split('\0'),
		// numeric, hex or date detection
		xD =
			parseInt(x.match(hre), 10) ||
			(xN.length !== 1 && x.match(dre) && Date.parse(x)),
		yD =
			parseInt(y.match(hre), 10) ||
			(xD && y.match(dre) && Date.parse(y)) ||
			null;

	// first try and sort Hex codes or Dates
	if (yD) {
		if (xD < yD) {
			return -1;
		}
		else if (xD > yD) {
			return 1;
		}
	}

	// natural sorting through split numeric strings and default strings
	for (
		var cLoc = 0, numS = Math.max(xN.length, yN.length);
		cLoc < numS;
		cLoc++
	) {
		// find floats not starting with '0', string or 0 if not defined (Clint Priest)
		var oFxNcL =
			(!(xN[cLoc] || '').match(ore) && parseFloat(xN[cLoc])) || xN[cLoc] || 0;
		var oFyNcL =
			(!(yN[cLoc] || '').match(ore) && parseFloat(yN[cLoc])) || yN[cLoc] || 0;

		// handle numeric vs string comparison - number < string - (Kyle Adams)
		if (isNaN(oFxNcL) !== isNaN(oFyNcL)) {
			return isNaN(oFxNcL) ? 1 : -1;
		}
		// rely on string comparison if different types - i.e. '02' < 2 != '02' < '2'
		else if (typeof oFxNcL !== typeof oFyNcL) {
			oFxNcL += '';
			oFyNcL += '';
		}

		if (oFxNcL < oFyNcL) {
			return -1;
		}

		if (oFxNcL > oFyNcL) {
			return 1;
		}
	}

	return 0;
}

DataTable.ext.type.order['natural-asc'] = function (a, b) {
	return naturalSort(a, b, true);
};

DataTable.ext.type.order['natural-desc'] = function (a, b) {
	return naturalSort(a, b, true) * -1;
};

DataTable.ext.type.order['natural-nohtml-asc'] = function (a, b) {
	return naturalSort(a, b, false);
};

DataTable.ext.type.order['natural-nohtml-desc'] = function (a, b) {
	return naturalSort(a, b, false) * -1;
};

DataTable.ext.type.order['natural-ci-asc'] = function (a, b) {
	a = a.toString().toLowerCase();
	b = b.toString().toLowerCase();

	return naturalSort(a, b, true);
};

DataTable.ext.type.order['natural-ci-desc'] = function (a, b) {
	a = a.toString().toLowerCase();
	b = b.toString().toLowerCase();

	return naturalSort(a, b, true) * -1;
};
