package com.earth2me.essentials;

import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import net.ess3.api.IEssentials;
import org.bukkit.command.Command;
import org.bukkit.command.PluginCommand;
import org.bukkit.command.PluginCommandYamlParser;
import org.bukkit.plugin.Plugin;


public class AlternativeCommandsHandler
{
	private static final Logger LOGGER = Logger.getLogger("Essentials");
	private final transient Map<String, List<PluginCommand>> altcommands = new HashMap<String, List<PluginCommand>>();
	private final transient Map<String, String> disabledList = new HashMap<String, String>();
	private final transient IEssentials ess;

	public AlternativeCommandsHandler(final IEssentials ess)
	{
		this.ess = ess;
		for (Plugin plugin : ess.getServer().getPluginManager().getPlugins())
		{
			if (plugin.isEnabled())
			{
				addPlugin(plugin);
			}
		}
	}

	public final void addPlugin(final Plugin plugin)
	{
		if (plugin.getDescription().getMain().contains("com.earth2me.essentials"))
		{
			return;
		}
		final List<Command> commands = PluginCommandYamlParser.parse(plugin);
		final String pluginName = plugin.getDescription().getName().toLowerCase(Locale.ENGLISH);

		for (Command command : commands)
		{
			final PluginCommand pc = (PluginCommand)command;
			final List<String> labels = new ArrayList<String>(pc.getAliases());
			labels.add(pc.getName());

			PluginCommand reg = ess.getServer().getPluginCommand(pluginName + ":" + pc.getName().toLowerCase(Locale.ENGLISH));
			if (reg == null)
			{
				reg = ess.getServer().getPluginCommand(pc.getName().toLowerCase(Locale.ENGLISH));
			}
			if (reg == null || !reg.getPlugin().equals(plugin))
			{
				continue;
			}
			for (String label : labels)
			{
				List<PluginCommand> plugincommands = altcommands.get(label.toLowerCase(Locale.ENGLISH));
				if (plugincommands == null)
				{
					plugincommands = new ArrayList<PluginCommand>();
					altcommands.put(label.toLowerCase(Locale.ENGLISH), plugincommands);
				}
				boolean found = false;
				for (PluginCommand pc2 : plugincommands)
				{
					if (pc2.getPlugin().equals(plugin))
					{
						found = true;
					}
				}
				if (!found)
				{
					plugincommands.add(reg);
				}
			}
		}
	}

	public void removePlugin(final Plugin plugin)
	{
		final Iterator<Map.Entry<String, List<PluginCommand>>> iterator = altcommands.entrySet().iterator();
		while (iterator.hasNext())
		{
			final Map.Entry<String, List<PluginCommand>> entry = iterator.next();
			final Iterator<PluginCommand> pcIterator = entry.getValue().iterator();
			while (pcIterator.hasNext())
			{
				final PluginCommand pc = pcIterator.next();
				if (pc.getPlugin() == null || pc.getPlugin().equals(plugin))
				{
					pcIterator.remove();
				}
			}
			if (entry.getValue().isEmpty())
			{
				iterator.remove();
			}
		}
	}

	public PluginCommand getAlternative(final String label)
	{
		final List<PluginCommand> commands = altcommands.get(label);
		if (commands == null || commands.isEmpty())
		{
			return null;
		}
		if (commands.size() == 1)
		{
			return commands.get(0);
		}
		// return the first command that is not an alias
		for (PluginCommand command : commands)
		{
			if (command.getName().equalsIgnoreCase(label))
			{
				return command;
			}
		}
		// return the first alias
		return commands.get(0);
	}

	public void executed(final String label, final PluginCommand pc)
	{
		final String altString = pc.getPlugin().getName() + ":" + pc.getLabel();
		if (ess.getSettings().isDebug())
		{
			LOGGER.log(Level.INFO, "Essentials: Alternative command " + label + " found, using " + altString);
		}
		disabledList.put(label, altString);
	}

	public Map<String, String> disabledCommands()
	{
		return disabledList;
	}
}