package org.bukkit.craftbukkit.conversations;

import org.bukkit.Bukkit;
import org.bukkit.conversations.Conversation;
import org.bukkit.conversations.ConversationAbandonedEvent;
import org.bukkit.conversations.ManuallyAbandonedConversationCanceller;

import java.util.LinkedList;
import java.util.logging.Level;

/**
 */
public class ConversationTracker
{

	private LinkedList<Conversation> conversationQueue = new LinkedList<Conversation>();

	public synchronized boolean beginConversation(Conversation conversation)
	{
		if(!conversationQueue.contains(conversation))
		{
			conversationQueue.addLast(conversation);
			if(conversationQueue.getFirst() == conversation)
			{
				conversation.begin();
				conversation.outputNextPrompt();
				return true;
			}
		}
		return true;
	}

	public synchronized void abandonConversation(Conversation conversation, ConversationAbandonedEvent details)
	{
		if(!conversationQueue.isEmpty())
		{
			if(conversationQueue.getFirst() == conversation)
			{
				conversation.abandon(details);
			}
			if(conversationQueue.contains(conversation))
			{
				conversationQueue.remove(conversation);
			}
			if(!conversationQueue.isEmpty())
			{
				conversationQueue.getFirst().outputNextPrompt();
			}
		}
	}

	public synchronized void abandonAllConversations()
	{

		LinkedList<Conversation> oldQueue = conversationQueue;
		conversationQueue = new LinkedList<Conversation>();
		for(Conversation conversation : oldQueue)
		{
			try
			{
				conversation.abandon(new ConversationAbandonedEvent(conversation, new ManuallyAbandonedConversationCanceller()));
			} catch(Throwable t)
			{
				Bukkit.getLogger().log(Level.SEVERE, "Unexpected exception while abandoning a conversation", t);
			}
		}
	}

	public synchronized void acceptConversationInput(String input)
	{
		if(isConversing())
		{
			conversationQueue.getFirst().acceptInput(input);
		}
	}

	public synchronized boolean isConversing()
	{
		return !conversationQueue.isEmpty();
	}

	public synchronized boolean isConversingModaly()
	{
		return isConversing() && conversationQueue.getFirst().isModal();
	}
}