/*
http://www.quirksmode.org
http://www.quirksmode.org/js/detect.html 
http://www.quirksmode.org/about/copyright.html
*/
var BrowserDetect = {
    init: function () {
        this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
        if(this.browser == 'iPhone') {
            this.version = this.searchIphoneVersion();
        } else {
            this.version = this.searchVersion(navigator.userAgent)
                || this.searchVersion(navigator.appVersion)
                || "an unknown version";
        }
        this.OS = this.searchString(this.dataOS) || "an unknown OS";
        //this.dropboxSupport = (this.OS == 'Windows' || this.OS == 'Mac');
        this.dropboxSupport = true;
    },

    searchString: function (data) {
        for (var i=0;i<data.length;i++)    {
            var dataString = data[i].string;
            var dataProp = data[i].prop;
            this.versionSearchString = data[i].versionSearch || data[i].identity;
            if (dataString) {
                if (dataString.indexOf(data[i].subString) != -1)
                    return data[i].identity;
            }
            else if (dataProp)
                return data[i].identity;
        }
    },

    searchIphoneVersion: function() {
        var ss = 'iPhone OS ';
        var start = navigator.userAgent.indexOf(ss) + ss.length;
        var end = navigator.userAgent.indexOf(' ', start);
        var version = navigator.userAgent.substring(start, end);
        return version;
    },

    searchVersion: function (dataString) {
        var index = dataString.indexOf(this.versionSearchString);
        if (index == -1) return;
        return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
    },
    dataBrowser: [
        {
            string: navigator.userAgent,
            subString: "iPhone",
            identity: "iPhone"
        },
        {
            string: navigator.userAgent,
            subString: "Chrome",
            identity: "Chrome"
        },
        {   
            string: navigator.userAgent,
            subString: "OmniWeb",
            versionSearch: "OmniWeb/",
            identity: "OmniWeb"
        },
        {
            string: navigator.vendor,
            subString: "Apple",
            identity: "Safari",
            versionSearch: "Version"
        },
        {
            prop: window.opera,
            identity: "Opera"
        },
        {
            string: navigator.vendor,
            subString: "iCab",
            identity: "iCab"
        },
        {
            string: navigator.vendor,
            subString: "KDE",
            identity: "Konqueror"
        },
        {
            string: navigator.userAgent,
            subString: "Firefox",
            identity: "Firefox"
        },
        {
            string: navigator.userAgent,
            subString: "Iceweasel",
            identity: "Firefox"
        },
        {
            string: navigator.vendor,
            subString: "Camino",
            identity: "Camino"
        },
        {        // for newer Netscapes (6+)
            string: navigator.userAgent,
            subString: "Netscape",
            identity: "Netscape"
        },
        {
            string: navigator.userAgent,
            subString: "MSIE",
            identity: "Explorer",
            versionSearch: "MSIE"
        },
        {
            string: navigator.userAgent,
            subString: "Gecko",
            identity: "Mozilla",
            versionSearch: "rv"
        },
        {         // for older Netscapes (4-)
            string: navigator.userAgent,
            subString: "Mozilla",
            identity: "Netscape",
            versionSearch: "Mozilla"
        }
    ],
    dataOS : [
        {
            string: navigator.platform,
            subString: "Win",
            identity: "Windows"
        },
        {
            string: navigator.platform,
            subString: "Mac",
            identity: "Mac"
        },
        {
            string: navigator.platform,
            subString: "Linux",
            identity: "Linux"
        }
    ]

};
BrowserDetect.init();

var checkUnsupportedBrowser = function() {
    if ((BrowserDetect.browser != 'Firefox') && 
        (BrowserDetect.browser != 'Safari') && 
        (BrowserDetect.browser != 'Chrome') &&
        (BrowserDetect.browser != 'Explorer') &&
        (BrowserDetect.browser != 'iPhone')) {
            window.location = "unsupportedbrowser.html";
            return false;
    } else {
        if ((BrowserDetect.browser == 'Explorer')) {
            if (BrowserDetect.version < 7) {
                window.location = "unsupportedbrowser.html";
                return false;
            }
        } else if (BrowserDetect.browser == 'Firefox') {
            if (BrowserDetect.version < 3) {
                window.location = "unsupportedbrowser.html";
                return false;
            }
        } else if (BrowserDetect.browser == 'iPhone') {
            if (BrowserDetect.version == '2_2_1') {
                window.location = "unsupportedbrowser.html";
                return false;
            }
        }
    }
    return true;
};