/*
most of the code here is writen by Timon Olsthoorn
Follow him on -
Github 	- https://github.com/tmnlsthrn
Twitter - @TimonOlsthoorn
*/

/* Lotus - iosver.js
 * Copyright (C) 2014-2015  Timon Olsthoorn (tmnlsthrn)
 */

/*
 *        Redistribution and use in source and binary
 * forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation
 *    and/or other materials provided with the
 *    distribution.
 * 3. The name of the author may not be used to endorse
 *    or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

// Adapted from https://github.com/tmnlsthrn/Lotus/blob/master/js/iosver.js


// changed const to var for IE9/10 compatibity.
var VERSION_CHECK_SUPPORTED = "Your iOS version is supported! 😊";
var VERSION_CHECK_NEEDS_UPGRADE = "Requires at least iOS %s 😕";
var VERSION_CHECK_UNCONFIRMED = "Not yet tested on iOS %s 😁";
var VERSION_CHECK_UNSUPPORTED = "Only compatible with iOS %s to %s 😞";

function ios_version_check(minIOS,maxIOS,otherIOS,callBack) {
	"use strict";


	function parseVersionString(version) {
		var bits = version.split(".");
		return [
				parseInt(bits[0], 10),
				parseInt(bits[1] ? bits[1] : 0, 10),
				parseInt(bits[2] ? bits[2] : 0, 10)
			   ];
	}

	function compareVersions(one, two) {
		// https://gist.github.com/TheDistantSea/8021359
		for (var i = 0; i < one.length; ++i) {
			if (two.length == i) {
				return 1;
			}

			if (one[i] == two[i]) {
				continue;
			} else if (one[i] > two[i]) {
				return 1;
			} else {
				return -1;
			}
		}

		if (one.length != two.length) {
			return -1;
		}

		return 0;
	}

	var version = navigator.appVersion.match(/CPU( iPhone)? OS (\d+)_(\d+)(_(\d+))? like/i);
	if (!version) {
		return 0;
	}

	var osVersion = [
						parseInt(version[2], 10),
						parseInt(version[3], 10),
						parseInt(version[4] ? version[5] : 0, 10)
					],

		osString = osVersion[0] + "." + osVersion[1] + (osVersion[2] && osVersion[2] != 0 ? "." + osVersion[2] : ""),
		minString = minIOS,
		maxString = maxIOS,

		minVersion = parseVersionString(minString),
		maxVersion = maxString ? parseVersionString(maxString) : null,

		message = VERSION_CHECK_SUPPORTED,
		isBad = false;

	if (compareVersions(minVersion, osVersion) == 1) {
		message = VERSION_CHECK_NEEDS_UPGRADE.replace("%s", minString);
		isBad = true;
	} else if (maxVersion && compareVersions(maxVersion, osVersion) == -1) {
		if ("unsupported" == otherIOS) {
			message = VERSION_CHECK_UNSUPPORTED.replace("%s", minString).replace("%s", maxString);
		} else {
			message = VERSION_CHECK_UNCONFIRMED.replace("%s", osString);
		}

		isBad = true;
	}
	callBack(message,isBad);

	return (isBad?-1:1);
}