/**
 * Basic CWIS functions for Javascript.
 *
 * Part of the Collection Workflow Integration System (CWIS)
 * Copyright 2011 Internet Scout Project
 * http://scout.wisc.edu
 */

var cw = {};

/**
 * Log a warning and optional information to the console.
 * @param message:string warning message
 * @param ...:mixed optional information to log
 */
cw.warning = function(message) {
    var info;

    if (arguments.length > 1) {
        info = Array.prototype.slice.call(arguments);

        // remove the message from the info. it's logged separately
        info.shift();

        console.warn(message, info);
    } else {
        console.warn(message);
    }
};

/**
 * Log an error and optional information to the console. Throws an exception.
 * @param message:string error message
 * @param ...:mixed optional information to log
 */
cw.error = function(message) {
    var info;

    if (arguments.length > 1) {
        info = Array.prototype.slice.call(arguments);

        // remove the message from the info. it's logged separately
        info.shift();

        console.error("Error Details:", info);
    }

    throw message;
};

/**
 * Extend a subclass to inherit another class' private methods, privileged
 * methods and data members.
 * http://blog.reinpetersen.com/2008/12/work-around-for-common-inheritance.html
 * @param subclass:Object_reference subclass class
 * @param base:Object_reference parent class
 */
cw.extend = function(subclass, base) {
    function Closure(){}
    Closure.prototype = base.prototype;
    subclass.prototype = new Closure();
    subclass.prototype.constructor = subclass;
    subclass.base = base;
};

(function(cw){

var Modules = {};

/**
 * Provide a named module for CWIS.
 * @param name:string module name
 * @param module:function module
 */
cw.provide = function(name, module) {
    if (typeof module != "function") {
        cw.error("Module isn't a function", {"name": name, "module": module});
    }

    Modules[name] = module;
};

/**
 * Retrieve a provided module.
 * @param name:string module name
 * @return reference reference to the module
 */
cw.require = function(name) {
    if (!Modules[name]) {
        cw.error("Module is unavailable.", {"name": name});
    }

    return new Modules[name];
};

}(cw));