var BrowserDetect = {
    init: function(){
        this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
        this.version = this.searchVersion(navigator.userAgent) ||
        this.searchVersion(navigator.appVersion) ||
        "an unknown version";
        this.OS = this.searchString(this.dataOS) || "an unknown OS";
    },
    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;
        }
    },
    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: "OmniWeb",
        versionSearch: "OmniWeb/",
        identity: "OmniWeb"
    }, {
        string: navigator.vendor,
        subString: "Apple",
        identity: "Safari"
    }, {
        prop: window.opera,
        identity: "Opera"
    }, {
        string: navigator.vendor,
        subString: "iCab",
        identity: "iCab"
    }, {
        string: navigator.vendor,
        subString: "Google",
        identity: "Chrome"
    }, {
        string: navigator.vendor,
        subString: "KDE",
        identity: "Konqueror"
    }, {
        string: navigator.userAgent,
        subString: "Firefox",
        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"
    }]

};


User = function(stylesheetPath) 
{
	this.browserSpecificSettings;
	BrowserDetect.init();
	this.init(stylesheetPath);
	this._loadBrowserSpecificStylesheet();
}

User.prototype.init = function(stylesheetPath){
    settings = {
        name: BrowserDetect.browser,
        version: BrowserDetect.version,
        up_facing_popup_offset: 19,
        down_facing_popup_offset: 5,
        shouldDoTransitionEffect: true,
        shouldHidePopupDuringTransition: true,
        shouldDelayPopupTransition: true,
        browserSpecificStylesheet: null,
		useAutocompleteOnGridSchedulePage: true,
		functions: []
    };
	if (BrowserDetect.browser == 'Explorer') {
		settings.browserSpecificStylesheet = stylesheetPath+'/ie.css';
	}
    if (BrowserDetect.browser == 'Explorer' && BrowserDetect.version < 7) {
        settings.shouldDoTransitionEffect = false;
        settings.shouldHidePopupDuringTransition = false;
        //settings.shouldDelayPopupTransition = false;
        settings.browserSpecificStylesheet = stylesheetPath+'/ie6.css';
		settings.useAutocompleteOnGridSchedulePage = false;
		functions = [pngfix()];
    }
    else 
        if (BrowserDetect.browser == 'Firefox') {
            settings.up_facing_popup_offset = 30;
            settings.down_facing_popup_offset = 17;
        }
        else 
            if (BrowserDetect.browser == 'Safari' || BrowserDetect.browser == 'Chrome') {
                settings.browserSpecificStylesheet = stylesheetPath+'/safari_chrome.css';
            }
    this.browserSpecificSettings = settings;
}

//private
User.prototype._addStylesheet = function(stylesheet)
{
    var html_doc = document.getElementsByTagName('head')[0];
    var css = document.createElement('link');
    css.setAttribute('rel', 'stylesheet');
    css.setAttribute('type', 'text/css');
    css.setAttribute('href', stylesheet);
    html_doc.appendChild(css);
}

User.prototype._loadBrowserSpecificStylesheet = function()
{
    if (this.browserSpecificSettings.browserSpecificStylesheet != null) 
        this._addStylesheet(this.browserSpecificSettings.browserSpecificStylesheet);
}