package me.aPanda.PandaTheEnchanter;

import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;

public class InventoryHelper
{
  public static int amtItem(Inventory inventory, int itemid)
  {
    int ret = 0;
    if (inventory != null) {
      ItemStack[] items = inventory.getContents();
      for (int slot = 0; slot < items.length; slot++) {
        if (items[slot] != null) {
          int id = items[slot].getTypeId();
          int amt = items[slot].getAmount();
          if (id == itemid) {
            ret += amt;
          }
        }
      }
    }
    return ret;
  }

  public static void setItem(Inventory inventory, int itemid, int amt) {
    if (inventory != null) {
      ItemStack[] items = inventory.getContents();
      for (int slot = 0; slot < items.length; slot++)
        if (items[slot] != null) {
          int id = items[slot].getTypeId();
          if (id == itemid) {
            items[slot].setAmount(amt);
            return;
          }
        }
    }
  }

  public static void removeItem(Inventory inventory, int itemid, int ret)
  {
    int start = ret;
    if (inventory != null) {
      ItemStack[] items = inventory.getContents();
      for (int slot = 0; slot < items.length; slot++)
        if (items[slot] != null) {
          int id = items[slot].getTypeId();
          int amt = items[slot].getAmount();
          if (id == itemid) {
            if (ret > 0) {
              if (amt >= ret) {
                amt -= ret;
                ret = 0;
              } else {
                ret = start - amt;
                amt = 0;
              }
              if (amt > 0)
                inventory.setItem(slot, new ItemStack(id, amt));
              else {
                inventory.setItem(slot, null);
              }
            }
            if (ret <= 0)
              return;
          }
        }
    }
  }

  public static void removeItem(Inventory inventory, int slot1)
  {
    if (inventory != null) {
      ItemStack[] items = inventory.getContents();
      items[slot1].setAmount(0);
    }
  }

  public static boolean isEmpty(Inventory inventory) {
    if (inventory != null) {
      ItemStack[] items = inventory.getContents();
      for (int slot = 0; slot < items.length; slot++) {
        if ((items[slot] != null) &&
          (items[slot].getTypeId() > 0)) {
          return false;
        }
      }
    }

    return true;
  }

  public static boolean clearInventory(Inventory inventory) {
    if (inventory != null) {
      ItemStack[] items = inventory.getContents();
      for (int slot = 0; slot < items.length; slot++) {
        if ((items[slot] == null) ||
          (items[slot].getTypeId() <= 0)) continue;
        items[slot] = null;
      }

    }

    return true;
  }

  public static int getItemPosition(Inventory inventory, ItemStack itm) {
    if (inventory != null) {
      ItemStack[] items = inventory.getContents();
      for (int slot = 0; slot < items.length; slot++) {
        if ((items[slot] != null) &&
          (items[slot].equals(itm))) {
          return slot;
        }
      }
    }

    return -1;
  }

  public static int getFirstFreeSlot(Inventory inventory) {
    if (inventory != null) {
      ItemStack[] items = inventory.getContents();
      for (int slot = 0; slot < items.length; slot++) {
        if (items[slot] != null) {
          if (items[slot].getTypeId() == 0)
            return slot;
        }
        else {
          return slot;
        }
      }
    }
    return -1;
  }
}