=begin
#==============================================================================
 ** Effect: Required Item
 Author: Hime
 Date: Nov 13, 2012
------------------------------------------------------------------------------
 ** Change log
 Nov 13, 2012
   - initial release
------------------------------------------------------------------------------   
 ** Terms of Use
 * Free to use in non-commercial projects
 * Contact me for commercial use
 * No real support. The script is provided as-is
 * Will do bug fixes, but no compatibility patches
 * Features may be requested but no guarantees, especially if it is non-trivial
 * Preserve this header
------------------------------------------------------------------------------
 ** Required
 -Effect Manager
  (http://himeworks.com/2012/10/05/effects-manager)
------------------------------------------------------------------------------
 Allows you to specify that certain item must exist in the inventory
 and will be consumed. If it is a item or skill and the required items are not
 available then it cannot be used.
 
 Tag items/skills with
   <eff: req_item id amount>
   
 Where id is of the form 
   a1 for armor 1,
   w2 for weapon 2,
   i3 for item 3
   
 And amount is the number of items you must have and will be consumed.
   
#==============================================================================
=end
$imported = {} if $imported.nil?
$imported["Effect_RequiredItem"] = true
#==============================================================================
# ** Rest of the script
#==============================================================================
module Effects
  module Required_Item
    Effect_Manager.register_effect(:req_item, 2.3)
  end
end

module RPG
  class BaseItem
    attr_accessor :required_items
    
    def add_effect_req_item(code, data_id, args)
      # initialize if needed
      @required_items ||= {}
      
      # add requirements
      id = args[0][1..-1].to_i
      amount = args[1].to_i
      case args[0].downcase[0]
      when "w"
        item = $data_weapons[id]
      when "a"
        item = $data_armors[id]
      when "i"
        item = $data_items[id]
      end
      
      # Multiple effects with same item are just added on
      if @required_items.include?(item)
        @required_items[item] += amount        
      else
        @required_items[item] = amount
        add_effect(code, data_id, [item])
      end
    end
  end
end

# Add logic for checking whether the skill/item can be used or not
class Game_BattlerBase
  
  def eff_req_item_conditions_met?(item)
    return true if item.required_items.nil? || item.required_items.empty?
    return false if item.required_items.any? {|req_item, amount|
      $game_party.item_number(req_item) < amount
    }
    return true
  end
  
  alias :eff_req_item_skill_cond_met? :skill_conditions_met?
  def skill_conditions_met?(skill)
    eff_req_item_skill_cond_met?(skill) && eff_req_item_conditions_met?(skill)
  end
  
  alias :eff_req_item_cond_met? :item_conditions_met?
  def item_conditions_met?(item)
    eff_req_item_cond_met?(item) && eff_req_item_conditions_met?(item)
  end
end

class Game_Battler < Game_BattlerBase
  
  def effect_req_item(obj, effect)
    item = effect.value1[0]
    amount = obj.required_items[item]
    $game_party.lose_item(item, amount)
  end
  
  alias :item_effect_req_item_global :effect_req_item
end