import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;

public class InventoryHelper {



    public static int getItemAmount(final Player player, final ItemStack is) {
        int amount = 0;
        ItemStack[] contents;
        for (int length = (contents = player.getInventory().getContents()).length, i = 0; i < length; ++i) {
            final ItemStack itemStack = contents[i];
            if(is.hasItemMeta() && is.getItemMeta().hasDisplayName()) {
                if (itemStack != null && itemStack.getType() == is.getType() && itemStack.getDurability() == is.getDurability()
                        && (itemStack.hasItemMeta() && itemStack.getItemMeta().hasDisplayName() && itemStack.getItemMeta().equals(is.getItemMeta()))) {
                    amount += itemStack.getAmount();
                }
            }else{
                if (itemStack != null && itemStack.getType() == is.getType() && itemStack.getDurability() == is.getDurability()) {
                    amount += itemStack.getAmount();
                }
            }
        }
        return amount;
    }

    public static void removeItemAmount(Player player, Material material, byte data, int amount){
        removeItems(new ItemStack(material, 1, data),player,amount);
    }


    public static void removeItems(final ItemStack is, final Player p, int amount) {
        ItemStack[] contents;
        for (int length = (contents = p.getInventory().getContents()).length, i = 0; i < length; ++i) {
            final ItemStack itemStack = contents[i];

            if(is.hasItemMeta() && is.getItemMeta().hasDisplayName()){
                if (amount > 0 && itemStack != null && itemStack.getType() == is.getType() && itemStack.getDurability() == is.getDurability()
                        && (itemStack.hasItemMeta() && itemStack.getItemMeta().hasDisplayName() && itemStack.getItemMeta().equals(is.getItemMeta()))
                ) {
                    if (itemStack.getAmount() > amount) {
                        itemStack.setAmount(itemStack.getAmount() - amount);
                        amount = 0;
                    }
                    else {
                        amount -= itemStack.getAmount();
                        p.getInventory().removeItem(itemStack);
                    }
                }
            }else{
                if (amount > 0 && itemStack != null && itemStack.getType() == is.getType() && itemStack.getDurability() == is.getDurability()) {
                    if (itemStack.getAmount() > amount) {
                        itemStack.setAmount(itemStack.getAmount() - amount);
                        amount = 0;
                    }
                    else {
                        amount -= itemStack.getAmount();
                        p.getInventory().removeItem(itemStack);
                    }
                }
            }
        }
    }

}