ItemID[0] = 2
  ItemReqsID[0] = [2]
  ItemReqsQTY[0] = [1]
  ItemReqsIsUsedUp[0] = [true]
  CustomCriteria[0] = "true"

#==============================================================================
# Alissa Item Requirements System
#==============================================================================
# Information:
#  This script adds item requirements criteria to item usages (like recipes).
#  Each required items can be set whether it will be used up on item
#  consumption.
#
# Installation:
#  Just place above Main.
#
# Credits
#  Alissa Liu
#
#==============================================================================

#---------------------------------------------------------------------------
# ** ItemReqs Module
#---------------------------------------------------------------------------
module ItemReqs
  ItemID = []            # Requiring item ID
  ItemReqsID = []        # Array of required items ID
  ItemReqsQTY = []        # Array of number of required items
  ItemReqsIsUsedUp = []  # Required items used up?
  CustomCriteria = []    # Script code strings for condition evaluation
                          # (returns boolean value)
 
  # Add as many as you want (this list is just for sample)
  ItemID[0] = 22
  ItemReqsID[0] = [21]
  ItemReqsQTY[0] = [1]
  ItemReqsIsUsedUp[0] = [true]
  CustomCriteria[0] = "true"
 
  ItemID[1] = 23
  ItemReqsID[1] = [21]
  ItemReqsQTY[1] = [1]
  ItemReqsIsUsedUp[1] = [true]
  CustomCriteria[1] = "true"
end

#==============================================================================
# ** Game_Party
#------------------------------------------------------------------------------
#  This class handles the party. It includes information on amount of gold
# and items. The instance of this class is referenced by $game_party.
#==============================================================================

class Game_Party < Game_Unit
  #--------------------------------------------------------------------------
  # * Consume Items
  #    item : item
  #    If the specified object is a consumable item, the number in investory
  #    will be reduced by 1.
  #--------------------------------------------------------------------------
  def consume_item(item)
    if item.is_a?(RPG::Item) and item.consumable
      lose_item(item, 1)
    end
    i=0
    while i<ItemReqs::ItemID.length
      case item
        when RPG::Item
        if ItemReqs::ItemID[i]==item.id
          break
        end
      end
      i+=1
    end
    if i<ItemReqs::ItemID.length && ItemReqs::ItemReqsID[i].length>0
      for j in 0..ItemReqs::ItemReqsID[i].length-1
        if ItemReqs::ItemReqsIsUsedUp[i][j]
          lose_item($data_items[ItemReqs::ItemReqsID[i][j]], ItemReqs::ItemReqsQTY[i][j])
        end
      end
    end
  end
  #--------------------------------------------------------------------------
  # * Determine if Item is Usable
  #    item : item
  #--------------------------------------------------------------------------
  def item_can_use?(item)
    return false unless item.is_a?(RPG::Item)
    return false if item_number(item) == 0
    fulfilled = true
    i=0
    while i<ItemReqs::ItemID.length
      if item.is_a?(RPG::Item)
        if ItemReqs::ItemID[i]==item.id
          break
        end
      end
      i+=1
    end
    if i<ItemReqs::ItemID.length
      if ItemReqs::ItemReqsID[i].length>0
        for j in 0..ItemReqs::ItemReqsID[i].length-1
          fulfilled = (fulfilled && $game_party.item_number($data_items[ItemReqs::ItemReqsID[i][j]])>=ItemReqs::ItemReqsQTY[i][j])
        end
      end
      fulfilled = (fulfilled && eval(ItemReqs::CustomCriteria[i]))
    end
    return false if not fulfilled
    if $game_temp.in_battle
      return item.battle_ok?
    else
      return item.menu_ok?
    end
  end
end

#==============================================================================
# ** Window_Item
#------------------------------------------------------------------------------
#  This window displays a list of inventory items for the item screen, etc.
#==============================================================================

class Window_Item < Window_Selectable
  #--------------------------------------------------------------------------
  # * Update Help Text
  #--------------------------------------------------------------------------
  def update_help
    extra_text = ""
    i=0
    while i<ItemReqs::ItemID.length
      case item
        when RPG::Item
        if ItemReqs::ItemID[i]==item.id
          break
        end
      end
      i+=1
    end
    if i<ItemReqs::ItemID.length && ItemReqs::ItemReqsID[i].length>0
      extra_text = " Requires "+sprintf("%d ",ItemReqs::ItemReqsQTY[i][0])+$data_items[ItemReqs::ItemReqsID[i][0]].name
      if ItemReqs::ItemReqsID[i].length>1
        for j in 1..ItemReqs::ItemReqsID[i].length-1
          extra_text = extra_text+", "+sprintf("%d ",ItemReqs::ItemReqsQTY[i][j])+$data_items[ItemReqs::ItemReqsID[i][j]].name
        end
      end
    end
    @help_window.set_text(item == nil ? "" : item.description+extra_text)
  end
end

#==============================================================================
# ** Scene_Item
#------------------------------------------------------------------------------
#  This class performs the item screen processing.
#==============================================================================

class Scene_Item < Scene_Base
  #--------------------------------------------------------------------------
  # * Use Item (apply effects to non-ally targets)
  #--------------------------------------------------------------------------
  alias use_item_nontarget_ir use_item_nontarget unless method_defined?('use_item_nontarget_ir')
  def use_item_nontarget
    use_item_nontarget_ir
    @item_window.refresh
  end
end