#===============================================================================
#
#===============================================================================
class UI::BPShopStockWrapper < UI::MartStockWrapper
  def buy_price(item)
    return 0 if item.nil?
    if $game_temp.mart_prices && $game_temp.mart_prices[item]
      return $game_temp.mart_prices[item][0] if $game_temp.mart_prices[item][0] > 0
    end
    return GameData::Item.get(item).bp_price
  end

  def buy_price_string(item)
    price = buy_price(item)
    return _INTL("{1} BP", price.to_s_formatted)
  end
end

#===============================================================================
# Pokémon Mart.
#===============================================================================
class UI::BPShopVisualsList < UI::MartVisualsList
  def expensive?(this_item)
    return @stock.buy_price(this_item) > $player.battle_points
  end
end

#===============================================================================
#
#===============================================================================
class UI::BPShopVisuals < UI::MartVisuals
  def initialize_item_list
    @sprites[:item_list] = UI::BPShopVisualsList.new(@stock, 152, 10, 374, 38 + (ITEMS_VISIBLE * 32), @viewport)
    @sprites[:item_list].expensive_base_color   = TEXT_COLOR_THEMES[:expensive][0]
    @sprites[:item_list].expensive_shadow_color = TEXT_COLOR_THEMES[:expensive][1]
    @sprites[:item_list].active                 = false
  end

  #-----------------------------------------------------------------------------

  # Like the one in class BaseVisuals, but shows the money as BP instead of $.
  def choose_number_as_money_multiplier(help_text, money_per_unit, maximum, init_value = 1)
    @sprites[:speech_box].visible = true
    @sprites[:speech_box].text = help_text
    pbBottomLeftLines(@sprites[:speech_box], 2)
    # Show the help text
    loop do
      Graphics.update
      Input.update
      update_visuals
      if @sprites[:speech_box].busy?
        if Input.trigger?(Input::USE)
          pbPlayDecisionSE if @sprites[:speech_box].pausing?
          @sprites[:speech_box].resume
        end
      else
        break
      end
    end
    # Choose a quantity
    item_price = money_per_unit
    quantity = init_value
    using(num_window = Window_AdvancedTextPokemon.newWithSize(
          _INTL("×{1}<r>{2} BP", quantity, (quantity * item_price).to_s_formatted),
          0, 0, 224, 64, @viewport)) do
      num_window.z              = 2000
      num_window.visible        = true
      num_window.letterbyletter = false
      pbBottomRight(num_window)
      num_window.y -= @sprites[:speech_box].height
      loop do
        Graphics.update
        Input.update
        update
        num_window.update
        # Change quantity
        old_quantity = quantity
        if Input.repeat?(Input::LEFT)
          quantity = [quantity - 10, 1].max
        elsif Input.repeat?(Input::RIGHT)
          quantity = [quantity + 10, maximum].min
        elsif Input.repeat?(Input::UP)
          quantity += 1
          quantity = 1 if quantity > maximum
        elsif Input.repeat?(Input::DOWN)
          quantity -= 1
          quantity = maximum if quantity < 1
        end
        if quantity != old_quantity
          num_window.text = _INTL("×{1}<r>{2} BP", quantity, (quantity * item_price).to_s_formatted)
          pbPlayCursorSE
        end
        # Finish choosing a quantity
        if Input.trigger?(Input::USE)
          pbPlayDecisionSE
          break
        elsif Input.trigger?(Input::BACK)
          pbPlayCancelSE
          quantity = 0
          break
        end
      end
    end
    @sprites[:speech_box].visible = false
    return quantity
  end

  #-----------------------------------------------------------------------------

  def refresh_money_window
    @sprites[:money_window].text = _INTL("BP:\n<r>{1}", $player.battle_points.to_s_formatted)
  end
end

#===============================================================================
#
#===============================================================================
class UI::BPShop < UI::Mart
  SCREEN_ID = :bp_shop

  def initialize_stock(stock)
    @stock = UI::BPShopStockWrapper.new(stock)
  end

  def initialize_visuals
    @visuals = UI::BPShopVisuals.new(@stock, @bag)
  end
end

#===============================================================================
#
#===============================================================================
UIActionHandlers.add(UI::BPShop::SCREEN_ID, :interact, {
  :effect => proc { |screen|
    item = screen.item
    item_price = screen.stock.buy_price(item)
    # Check affordability
    if $player.battle_points < item_price
      screen.show_message(_INTL("I'm sorry, you don't have enough BP."))
      next
    end
    # Choose how many of the item to buy
    quantity = 0
    if item.is_important?
      quantity = 1
      next if !screen.show_confirm_message(
        _INTL("You would like the {1}?\nThat will be {2} BP.",
              item.portion_name, item_price.to_s_formatted)
      )
    else
      max_quantity = (item_price <= 0) ? PokemonBag::MAX_PER_SLOT : $player.battle_points / item_price
      max_quantity = [max_quantity, PokemonBag::MAX_PER_SLOT].min
      quantity = screen.choose_number_as_money_multiplier(
        _INTL("How many {1} would you like?", item.portion_name_plural), item_price, max_quantity
      )
      next if quantity == 0
      item_price *= quantity
      if quantity > 1
        next if !screen.show_confirm_message(
          _INTL("You would like {1} {2}?\nThey'll be {3} BP.",
                quantity, item.portion_name_plural, item_price.to_s_formatted)
        )
      elsif quantity > 0
        next if !screen.show_confirm_message(
          _INTL("You would like {1} {2}?\nThat will be {3} BP.",
                quantity, item.portion_name, item_price.to_s_formatted)
        )
      end
    end
    # Check affordability (should always be possible, but just make sure)
    if $player.battle_points < item_price
      screen.show_message(_INTL("I'm sorry, you don't have enough BP."))
      next
    end
    # Check the item can be put in the Bag
    if !screen.bag.can_add?(item.id, quantity)
      screen.show_message(_INTL("You have no room in your Bag."))
      next
    end
    # Add the bought item(s)
    screen.bag.add(item.id, quantity)
    $stats.battle_points_spent += item_price
    $stats.mart_items_bought += quantity
    $player.battle_points -= item_price
    screen.stock.refresh
    screen.refresh
    screen.show_message(_INTL("Here you are! Thank you!")) { pbSEPlay("Mart buy item") }
  }
})

#===============================================================================
#
#===============================================================================
def pbBattlePointShop(stock, speech = nil)
  if speech.nil?
    pbMessage(_INTL("Welcome to the Exchange Service Corner!"))
    pbMessage(_INTL("We can exchange your BP for fabulous items."))
  else
    pbMessage(speech)
  end
  UI::BPShop.new(stock, $bag).main
  pbMessage(_INTL("Thank you for visiting."))
  pbMessage(_INTL("Please visit us again when you have saved up more BP."))
  $game_temp.clear_mart_prices
end