function Brikz(api, apiKey, initKey) {
	var brikz = this, backup = {};
	apiKey = apiKey || 'exports';
	initKey = initKey || '__init__';

	function mixin(src, target, what) {
		for (var keys = Object.keys(what||src), l=keys.length, i=0; i<l; ++i) {
			if (src == null) { target[keys[i]] = undefined; } else {
				var value = src[keys[i]];
				if (typeof value !== "undefined") { target[keys[i]] = value; }
			}
		}
		return target;
	}

	var d={value: null, enumerable: false, configurable: true, writable: true};
	Object.defineProperties(this, { ensure: d, rebuild: d });
	var exclude = mixin(this, {});

	this.rebuild = function () {
		Object.keys(backup).forEach(function (key) {
			mixin(null, api, (backup[key]||0)[apiKey]||{});
		});
		var oapi = mixin(api, {}), order = [], chk = {};
		brikz.ensure = function(key) {
			if (key in exclude) { return null; }
			var b = brikz[key], bak = backup[key];
			mixin(null, api, api);
			while (typeof b === "function") { b = new b(brikz, api, bak); }
			if (b && !chk[key]) { chk[key]=true; order.push(b); }
			if (b && !b[apiKey]) { b[apiKey] = mixin(api, {}); }
			return brikz[key] = b;
		};
		Object.keys(brikz).forEach(function (key) { brikz.ensure(key); });
		brikz.ensure = null;
		mixin(oapi, mixin(null, api, api));
		order.forEach(function(brik) { mixin(brik[apiKey] || {}, api); });
		order.forEach(function(brik) { brik[initKey] && brik[initKey](); });
		backup = mixin(brikz, {});
	};
}