package com.c2kernel.process;

import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Properties;

import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.entity.proxy.ItemProxy;
import com.c2kernel.lookup.DomainPath;
import com.c2kernel.utils.FileStringUtility;
import com.c2kernel.utils.Logger;

public class ModuleManager {
	ArrayList<Module> modules = new ArrayList<Module>();
	Properties props = new Properties();
	boolean isServer;

	public ModuleManager(Enumeration<URL> moduleEnum, boolean isServer) {
		this.isServer = isServer;
		ArrayList<String> loadedModules = new ArrayList<String>();
		while(moduleEnum.hasMoreElements()) {
			URL newModuleURL = moduleEnum.nextElement();
			try {
				Module newModule = new Module(FileStringUtility.url2String(newModuleURL));
				modules.add(newModule);
				loadedModules.add(newModule.getName());
				Properties modProp = isServer?newModule.getServerProperties():newModule.getClientProperties();
		        for (Enumeration<?> e = modProp.propertyNames(); e.hasMoreElements();) {
		            String propName = (String)e.nextElement();
		            props.put(propName, modProp.get(propName));
		        }
			} catch (Exception e) {
				Logger.error("Could not load module description from "+newModuleURL);
				Logger.error(e);
			}
		}
		
		Logger.debug(5, "Checking dependencies");
		boolean depFailed = false;
		for (Module thisMod : modules) {
			ArrayList<String> deps = thisMod.getDependencies();
			for (String dep : deps) {
				if (!loadedModules.contains(dep)) {
					Logger.error("UNMET MODULE DEPENDENCY: "+thisMod.getName()+" requires "+dep);
					depFailed = true;
				}
			}
		}
		if (depFailed) Logger.die("Unmet module dependencies. Cannot continue");
	}

	public String getModuleVersions() {
		StringBuffer ver = new StringBuffer();
		for (Module thisMod : modules) {
			if (ver.length()>0) ver.append(";");
			ver.append(thisMod.getName()+"("+thisMod.getVersion()+")");
		}
		return ver.toString();
	}
	
	
	public Properties getAllModuleProperties() {
		return props;
	}
	
	public void runScripts(String event) {
		for (Module thisMod : modules) {
			thisMod.runScript(event, isServer);
		}
	}
	
	public void registerModules() throws ObjectNotFoundException {
		ItemProxy serverEntity = (ItemProxy)Gateway.getProxyManager().getProxy(new DomainPath("/servers/"+Gateway.getProperty("ItemServer.name")));
		Logger.debug(3, "Registering modules");
		for (Module thisMod : modules) {
			Logger.debug(4, "Registering module "+thisMod.getName());
			thisMod.importAll(serverEntity);
			Logger.msg("Module "+thisMod.getName()+" registered");
		}
	}
}