dolox/fallback

// Logging function for when debugging is turned on.
var log = function() {
    // Make sure that both debugging is enable and what `global.console` exists.
    if (!me.config.settings.debug || !global.console) {
        return false;
    }

    // Convert our `Arguments` into an `Array`.
    var args = me.arrayClone(arguments);

    // If we have no arguments, then halt the function.
    if (!args.length) {
        return false;
    }

    var first = args.shift();
    var level = me.log.levels[3];

    // If our first argument was a number, then it's our level to log at.
    if (me.isNumber(first)) {
        if (me.log.levels[first]) {
            level = me.log.levels[first];
        }

        first = args.shift();
    }

    // Check to make sure the level of the debug message is acceptable for the configured debugging output.
    if (me.config.settings.debug !== true && me.config.settings.debug !== level) {
        return false;
    }

    // Log the message to console.
    return log.message(level, log.prefixes(args, first), args);
};

// The various levels for our `log` function.
log.levels = {
    1: 'error',
    2: 'warn',
    3: 'info'
};

// Determine the method to be used to send a message to console.
log.method = function(level) {
    // Make a reference to our function, if the our level function doesn't exist natively in the browser.
    var method = 'log';

    // If the `method` exists, then use it.
    if (me.isFunction(global.console[level])) {
        method = level;
    }

    // Return the logging method.
    return method;
};

// Log a message to the console.
log.message = function(level, prefixes, args) {
    // The message for console.
    var message = '%cFallbackJS: %c' + level.toUpperCase() + ': ' + prefixes.join(': ') + ': %c' + args.join();

    // The styles for the message if the browser supports console styling.
    var style1 = 'font-weight: bold; color: #da542c';
    var style2 = 'font-weight: bold; color: #000';
    var style3 = 'color: #777';

    // If we're in IE, ditch the console styles, it's not supported. @ie
    if (me.browser.isIE()) {
        // Wipe the styles.
        style1 = style2 = style3 = '';

        // Replace the color variables in the message.
        message = message.replace(/%c/g, '');
    }

    // Log our message to the console. @todo need a non colorful message for legacy ie
    return global.console[log.method(level)](message, style1, style2, style3);
};

// Deteremine the prefixed messages to be sent with a log message.
log.prefixes = function(args, first) {
    // The prefixes before our actual message.
    var prefixes = [first];

    // Loop through each arguments, til we find the first item that's not a space, or a string not containing a space.
    me.each(args, function(item) {
        if (!me.isString(item) || item.indexOf(' ') !== -1) {
            return false;
        }

        prefixes.push(args.shift());
    });

    // Return the set of prefixes.
    return prefixes;
};

// Reference the module within the library.
me.log = log;