package org.bukkit.craftbukkit.util;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMap.Builder;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public final class CraftChatMessage
{
	private static class StringMessage
	{
		private static final Map<Character, net.minecraft.util.EnumChatFormatting> formatMap;
		private static final Pattern INCREMENTAL_PATTERN = Pattern.compile("(" + String.valueOf(org.bukkit.ChatColor.COLOR_CHAR) + "[0-9a-fk-or])|(\\n)|((?:[a-z0-9]{2,}:\\/\\/)?(?:(?:[0-9]{1,3}\\.){3}[0-9]{1,3}|(?:[-\\w_\\.]{1,}\\.[a-z]{2,}?))(?::[0-9]{1,5})?.*?(?=[!\"\u00A7 \n]|$))", Pattern.CASE_INSENSITIVE);

		static
		{
			Builder<Character, net.minecraft.util.EnumChatFormatting> builder = ImmutableMap.builder();
			for(net.minecraft.util.EnumChatFormatting format : net.minecraft.util.EnumChatFormatting.values())
			{
				builder.put(Character.toLowerCase(format.getFormattingCode()), format);
			}
			formatMap = builder.build();
		}

		private final List<net.minecraft.util.IChatComponent> list = new ArrayList<net.minecraft.util.IChatComponent>();
		private net.minecraft.util.IChatComponent currentChatComponent = new net.minecraft.util.ChatComponentTranslation(""); // Cauldron - ChatComponentText -> ChatComponentTranslation. fixes forge compatibility
		private net.minecraft.util.ChatStyle modifier = new net.minecraft.util.ChatStyle();
		private final net.minecraft.util.IChatComponent[] output;
		private int currentIndex;
		private final String message;

		private StringMessage(String message)
		{
			this.message = message;
			if(message == null)
			{
				output = new net.minecraft.util.IChatComponent[]{currentChatComponent};
				return;
			}
			list.add(currentChatComponent);

			Matcher matcher = INCREMENTAL_PATTERN.matcher(message);
			String match = null;
			while(matcher.find())
			{
				int groupId = 0;
				while((match = matcher.group(++groupId)) == null)
				{
					// NOOP
				}
				appendNewComponent(matcher.start(groupId));
				switch(groupId)
				{
				case 1:
					net.minecraft.util.EnumChatFormatting format = formatMap.get(match.toLowerCase().charAt(1));
					if(format == net.minecraft.util.EnumChatFormatting.RESET)
					{
						modifier = new net.minecraft.util.ChatStyle();
					}
					else if(format.isFancyStyling())
					{
						switch(format)
						{
						case BOLD:
							modifier.setBold(Boolean.TRUE);
							break;
						case ITALIC:
							modifier.setItalic(Boolean.TRUE);
							break;
						case STRIKETHROUGH:
							modifier.setStrikethrough(Boolean.TRUE);
							break;
						case UNDERLINE:
							modifier.setUnderlined(Boolean.TRUE);
							break;
						case OBFUSCATED:
							modifier.setObfuscated(Boolean.TRUE);
							break;
						default:
							throw new AssertionError("Unexpected message format");
						}
					}
					else
					{ // Color resets formatting
						modifier = new net.minecraft.util.ChatStyle().setColor(format);
					}
					break;
				case 2:
					currentChatComponent = null;
					break;
				case 3:
					if(match.indexOf("://") < 0)
					{
						match = "http://" + match;
					}
					modifier.setChatClickEvent(new net.minecraft.event.ClickEvent(net.minecraft.event.ClickEvent.Action.OPEN_URL, match)); // Should be setChatClickable
					appendNewComponent(matcher.end(groupId));
					modifier.setChatClickEvent((net.minecraft.event.ClickEvent) null);
				}
				currentIndex = matcher.end(groupId);
			}

			if(currentIndex < message.length())
			{
				appendNewComponent(message.length());
			}

			output = list.toArray(new net.minecraft.util.IChatComponent[0]);
		}

		private void appendNewComponent(int index)
		{
			if(index <= currentIndex)
			{
				return;
			}
			net.minecraft.util.IChatComponent addition = new net.minecraft.util.ChatComponentText(message.substring(currentIndex, index)).setChatStyle(modifier);
			currentIndex = index;
			modifier = modifier.createShallowCopy();
			if(currentChatComponent == null)
			{
				currentChatComponent = new net.minecraft.util.ChatComponentText("");
				list.add(currentChatComponent);
			}
			currentChatComponent.appendSibling(addition);
		}

		private net.minecraft.util.IChatComponent[] getOutput()
		{
			return output;
		}
	}

	public static net.minecraft.util.IChatComponent[] fromString(String message)
	{
		return new StringMessage(message).getOutput();
	}

	private CraftChatMessage()
	{
	}
}