Both Hands Style (Aero GP's toolbox)

#==============================================================================
# ** ExEquip_BothHanded (AEROGP)
#------------------------------------------------------------------------------
#  This script grants the ability to use a shield, as well as equip it in the
# weapon slot instead of the shield slot, when "two swords style" is enabled.
#==============================================================================

class Game_Actor < Game_Battler
  alias _exebthd_initialize initialize unless $@
  #--------------------------------------------------------------------------
  # * Object Initialization
  #     actor_id : actor ID
  #--------------------------------------------------------------------------
  def initialize(actor_id)
    _exebthd_initialize(actor_id)
    @weapon_class = RPG::Weapon
    @armor1_class = two_swords_style ? RPG::Weapon : RPG::Armor
  end
  #--------------------------------------------------------------------------
  # * Get Weapon Object Array (Redefined)
  #--------------------------------------------------------------------------
  def weapons
    result = []
    if @weapon_class == RPG::Weapon
      result.push($data_weapons[@weapon_id])
    end
    if @armor1_class == RPG::Weapon
      result.push($data_weapons[@armor1_id])
    end
    return result
  end
  #--------------------------------------------------------------------------
  # * Get Armor Object Array (Redefined)
  #--------------------------------------------------------------------------
  def armors
    result = []
    if @weapon_class == RPG::Armor
      result.push($data_armors[@weapon_id])
    end
    if @armor1_class == RPG::Armor
      result.push($data_armors[@armor1_id])
    end
    result.push($data_armors[@armor2_id])
    result.push($data_armors[@armor3_id])
    result.push($data_armors[@armor4_id])
    return result
  end
  #--------------------------------------------------------------------------
  # * Get Left-Hand Object
  #--------------------------------------------------------------------------
  def left_hand
    result = [nil]
    if @weapon_class == RPG::Weapon
      result = [$data_weapons[@weapon_id]]
    end
    if @weapon_class == RPG::Armor
      result = [$data_armors[@weapon_id]]
    end
    return result
  end
  #--------------------------------------------------------------------------
  # * Get Right-Hand Object
  #--------------------------------------------------------------------------
  def right_hand
    result = [nil]
    if @armor1_class == RPG::Weapon
      result = [$data_weapons[@armor1_id]]
    end
    if @armor1_class == RPG::Armor
      result = [$data_armors[@armor1_id]]
    end
    return result
  end
  #--------------------------------------------------------------------------
  # * Get Body Armor Object Array
  #--------------------------------------------------------------------------
  def body_armors
    result = []
    result.push($data_armors[@armor2_id])
    result.push($data_armors[@armor3_id])
    result.push($data_armors[@armor4_id])
    return result
  end
  #--------------------------------------------------------------------------
  # * Get Equipped Item Object Array (Redefined)
  #--------------------------------------------------------------------------
  def equips
    return left_hand + right_hand + body_armors
  end
  #--------------------------------------------------------------------------
  # * Change Equipment (Definition added)
  #     equip_type : Equip region (0..4)
  #     item       : Weapon or armor (nil is used to unequip)
  #     test       : Test flag (for battle test or temporary equipment)
  #--------------------------------------------------------------------------
  def change_equip(equip_type, item, test = false)
    last_item = equips[equip_type]
    unless test
      return if $game_party.item_number(item) == 0 if item != nil
      $game_party.gain_item(last_item, 1)
      $game_party.lose_item(item, 1)
    end
    item_id = item == nil ? 0 : item.id
    case equip_type
    when 0  # Weapon / Weapon 1
      @weapon_id = item_id
      if two_swords_style and item != nil   # If two swords style
        @weapon_class = item.class
        unless shield_legal?                # If shield is not allowed
          change_equip(1, nil, test)        # Unequip from other hand
        end
      end
      unless two_hands_legal?               # If two hands is not allowed
        change_equip(1, nil, test)          # Unequip from other hand
      end
    when 1  # Shield / Weapon 2
      @armor1_id = item_id
      if two_swords_style and item != nil   # If two swords style
        @armor1_class = item.class
        unless shield_legal?                # If shield is not allowed
          change_equip(0, nil, test)        # Unequip from other hand
        end
      end
      unless two_hands_legal?               # If two hands is not allowed
        change_equip(0, nil, test)          # Unequip from other hand
      end
    when 2  # Head
      @armor2_id = item_id
    when 3  # Body
      @armor3_id = item_id
    when 4  # Accessory
      @armor4_id = item_id
    end
  end
  #--------------------------------------------------------------------------
  # * Discard Equipment (Redefined)
  #     item : Weapon or armor to be discarded.
  #    Used when the "Include Equipment" option is enabled.
  #--------------------------------------------------------------------------
  def discard_equip(item)
    if item.is_a?(RPG::Weapon)
      if @weapon_class == item.class and @weapon_id == item.id
        @weapon_id = 0
      elsif @armor1_class == item.class and @armor1_id == item.id
        @armor1_id = 0
      end
    elsif item.is_a?(RPG::Armor)
      if @weapon_class == item.class and @weapon_id == item.id
        @weapon_id = 0
      elsif @armor1_class == item.class and @armor1_id == item.id
        @armor1_id = 0
      elsif @armor2_id == item.id
        @armor2_id = 0
      elsif @armor3_id == item.id
        @armor3_id = 0
      elsif @armor4_id == item.id
        @armor4_id = 0
      end
    end
  end
  #--------------------------------------------------------------------------
  # * Determine if Shield is Usable
  #--------------------------------------------------------------------------
  def shield_legal?
    if @weapon_id != 0 and @weapon_class == RPG::Armor
      return false if @armor1_class == RPG::Armor
    end
    if @armor1_id != 0 and @armor1_class == RPG::Armor
      return false if @weapon_class == RPG::Armor
    end
    return true
  end
  #--------------------------------------------------------------------------
  # * Determine if Equippable (Redefined)
  #     item : item
  #--------------------------------------------------------------------------
  def equippable?(item)
    if item.is_a?(RPG::Weapon)
      return self.class.weapon_set.include?(item.id)
    elsif item.is_a?(RPG::Armor)
      return self.class.armor_set.include?(item.id)
    end
    return false
  end
end

class Window_EquipItem < Window_Item
  #--------------------------------------------------------------------------
  # * Whether to include item in list (Redefined)
  #     item : item
  #--------------------------------------------------------------------------
  def include?(item)
    return true if item == nil
    if @equip_type == 0
      if @actor.two_swords_style
        return false if item.is_a?(RPG::Armor) and item.kind > 0
      else
        return false unless item.is_a?(RPG::Weapon)
      end
    else
      return false unless item.is_a?(RPG::Armor)
      return false unless item.kind == @equip_type - 1
    end
    return @actor.equippable?(item)
  end
end