package com.earth2me.essentials.commands;

import static com.earth2me.essentials.I18n.tl;
import java.util.*;
import org.bukkit.Material;
import org.bukkit.Server;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.Recipe;
import org.bukkit.inventory.ShapedRecipe;
import org.bukkit.inventory.ShapelessRecipe;
import com.earth2me.essentials.ChargeException;
import com.earth2me.essentials.Trade;
import com.earth2me.essentials.Trade.OverflowType;
import com.earth2me.essentials.User;
import net.ess3.api.MaxMoneyException;


public class Commandcondense extends EssentialsCommand
{
	public Commandcondense()
	{
		super("condense");
	}
	private Map<ItemStack, SimpleRecipe> condenseList = new HashMap<ItemStack, SimpleRecipe>();

	@Override
	public void run(final Server server, final User user, final String commandLabel, final String[] args) throws Exception
	{
		List<ItemStack> is = new ArrayList<ItemStack>();

		boolean validateReverse = false;
		if (args.length > 0)
		{
			is = ess.getItemDb().getMatching(user, args);
		}
		else
		{
			for (ItemStack stack : user.getBase().getInventory().getContents())
			{
				if (stack == null || stack.getType() == Material.AIR)
				{
					continue;
				}
				is.add(stack);
			}
			validateReverse = true;
		}

		boolean didConvert = false;
		for (final ItemStack itemStack : is)
		{
			if (condenseStack(user, itemStack, validateReverse))
			{
				didConvert = true;
			}
		}
		user.getBase().updateInventory();

		if (didConvert)
		{
			user.sendMessage(tl("itemsConverted"));
		}
		else
		{
			user.sendMessage(tl("itemsNotConverted"));
			throw new NoChargeException();
		}
	}

	private boolean condenseStack(final User user, final ItemStack stack, final boolean validateReverse) throws ChargeException, MaxMoneyException
	{
		final SimpleRecipe condenseType = getCondenseType(stack);
		if (condenseType != null)
		{
			final ItemStack input = condenseType.getInput();
			final ItemStack result = condenseType.getResult();

			if (validateReverse)
			{
				boolean pass = false;
				for (Recipe revRecipe : ess.getServer().getRecipesFor(input))
				{
					if (getStackOnRecipeMatch(revRecipe, result) != null)
					{
						pass = true;
						break;
					}
				}
				if (!pass)
				{
					return false;
				}
			}

			int amount = 0;

			for (final ItemStack contents : user.getBase().getInventory().getContents())
			{
				if (contents != null && contents.isSimilar(stack))
				{
					amount += contents.getAmount();
				}
			}

			int output = ((amount / input.getAmount()) * result.getAmount());
			amount -= amount % input.getAmount();

			if (amount > 0)
			{
				input.setAmount(amount);
				result.setAmount(output);
				final Trade remove = new Trade(input, ess);
				final Trade add = new Trade(result, ess);
				remove.charge(user);
				add.pay(user, OverflowType.DROP);
				return true;
			}
		}
		return false;
	}

	private SimpleRecipe getCondenseType(final ItemStack stack)
	{
		if (condenseList.containsKey(stack))
		{
			return condenseList.get(stack);
		}

		final Iterator<Recipe> intr = ess.getServer().recipeIterator();
		while (intr.hasNext())
		{
			final Recipe recipe = intr.next();
			final Collection<ItemStack> recipeItems = getStackOnRecipeMatch(recipe, stack);

			if (recipeItems != null && (recipeItems.size() == 4 || recipeItems.size() == 9)
				&& (recipeItems.size() > recipe.getResult().getAmount()))
			{
				final ItemStack input = stack.clone();
				input.setAmount(recipeItems.size());
				final SimpleRecipe newRecipe = new SimpleRecipe(recipe.getResult(), input);
				condenseList.put(stack, newRecipe);
				return newRecipe;
			}
		}

		condenseList.put(stack, null);
		return null;
	}

	private Collection<ItemStack> getStackOnRecipeMatch(final Recipe recipe, final ItemStack stack)
	{
		final Collection<ItemStack> inputList;

		if (recipe instanceof ShapedRecipe)
		{
			ShapedRecipe sRecipe = (ShapedRecipe)recipe;
			inputList = sRecipe.getIngredientMap().values();
		}
		else if (recipe instanceof ShapelessRecipe)
		{
			ShapelessRecipe slRecipe = (ShapelessRecipe)recipe;
			inputList = slRecipe.getIngredientList();
		}
		else
		{
			return null;
		}

		boolean match = true;
		Iterator<ItemStack> iter = inputList.iterator();
		while (iter.hasNext())
		{
			ItemStack inputSlot = iter.next();
			if (inputSlot == null)
			{
				iter.remove();
				continue;
			}

			if (inputSlot.getDurability() == Short.MAX_VALUE)
			{
				inputSlot.setDurability((short)0);
			}
			if (!inputSlot.isSimilar(stack))
			{
				match = false;
			}
		}

		if (match)
		{
			return inputList;
		}
		return null;
	}


	private class SimpleRecipe implements Recipe
	{
		private ItemStack result;
		private ItemStack input;

		private SimpleRecipe(ItemStack result, ItemStack input)
		{
			this.result = result;
			this.input = input;
		}

		@Override
		public ItemStack getResult()
		{
			return result.clone();
		}

		public ItemStack getInput()
		{
			return input.clone();
		}
	}
}