package ie.dcu.plugin;

import java.io.File;
import java.util.*;
import java.util.logging.Logger;

/**
 * I should probably use OSGi or something for this, but I couldn't be
 * bothered...
 * 
 * 
 * @author Kevin McGuinness
 */
public class PluginManager {
	private static final Logger log = Logger.getLogger("PluginManager");
	private List<String> searchPath;
	private List<Plugin> plugins;
	
	public PluginManager() {
		searchPath = new ArrayList<String>();
		plugins = new ArrayList<Plugin>();
	}
	
	public List<String> searchPath() {
		return searchPath;
	}
	
	public List<Plugin> plugins() {
		return Collections.unmodifiableList(plugins);
	}
	
	public void loadPlugins() {
		for (String folder : searchPath()) {
			loadPluginsFrom(folder);
		}
	}

	private void loadPluginsFrom(String path) {
		log.info("Loading plugins from: " + path);
		File file = new File(path);
		if (file.isDirectory()) {
			loadPluginFromFromFolder(file);
		} 
 	}
	
	private void loadPluginFromFromFolder(File file) {
		for (File f : file.listFiles()) {
			if (f.isDirectory() && f.getName().endsWith(".plugin")) {
				loadPlugin(f);
			}
		}
	}
	
	public boolean hasPlugin(File pluginFolder) {
		String name = pluginFolder.getName();
		for (Plugin p : plugins) {
			if (p.getRootFolder().getName().equals(name)) {
				return true;
			}
		}
		return false;
	}

	private void loadPlugin(File pluginFile) {
		if (!hasPlugin(pluginFile)) {
			log.info("Loading plugin: " + pluginFile.getName());
			PluginLoader loader = new PluginLoader(pluginFile);			
			try {
				Plugin plugin = loader.load();
				plugins.add(plugin);
			} catch (PluginException ex) {
				log.severe("Error loading plugin: " + ex.getMessage());
			}
		} else {
			log.info("Skipping plugin (already loaded): " + pluginFile.getName());
		}
	}
}