class Window_BookPage < Window_Base
  def initialize(page_text, page)
    if page
      @index = 1
    else
      @index = 0
    end
    @page_text = page_text
    
    super(32, 16, 288, 448)
    self.contents = Bitmap.new(width-32, height-32)
    self.opacity = 0
    refresh
  end
  
  def refresh
    self.contents.clear
    @space_modifier = 0
    for i in 0...@page_text.size
      if @page_text[i] != nil
        if @page_text[i].include?(".png")
          bitmap = RPG::Cache.picture(@page_text[i].chomp)
          x_pos = (self.contents.width / 2) - (bitmap.width / 2)
          self.contents.blt(x_pos, i * 32 + @space_modifier, bitmap, Rect.new(0, 0, bitmap.width, bitmap.height))
          @space_modifier += bitmap.height - 32
        else
          self.contents.font.color = Color.new(0,0,0,255)
          self.contents.draw_text(1, i * 32 + 1 + @space_modifier, self.contents.width, 32, @page_text[i].to_s)
          self.contents.font.color = normal_color
          self.contents.draw_text(0, i * 32 + @space_modifier, self.contents.width, 32, @page_text[i].to_s)
        end
      end
    end
  end
  
  def next_page
    @index += 2
    if $scene.pages[@index] != nil
      @page_text = IO.readlines($scene.directory + $scene.pages[@index])
    else
      @page_text = [""]
    end
    refresh
  end
  
  def back_page
    @index -= 2
    if $scene.pages[@index] != nil
      @page_text = IO.readlines($scene.directory + $scene.pages[@index])
    else
      @page_text = [""]
    end
    refresh
  end
end

class Scene_Book
  attr_accessor :pages
  attr_accessor :directory
  
  def initialize(book_name)
    @directory = "Book/" + book_name.to_s + "/"
    @pages = Dir.entries(@directory.to_s)
    @pages.delete("..")
    @pages.delete(".")
  end
  
  def play_open
    Audio.se_play("Audio/SE/Book-Turn", 100, 100)
  end
  
  def play_close
    Audio.se_play("Audio/SE/Book-Close", 100, 100)
  end
  
  def play_turn
    Audio.se_play("Audio/SE/Book-Turn", 100, 150)
  end
  
  def main
    @menu_bg = Sprite.new
    @menu_bg.bitmap = RPG::Cache.picture("Book-None")
    
    if @pages[0] != nil
      @left_page_text = IO.readlines(@directory + @pages[0])
    else
      @left_page_text = [""]
    end
    
    @left_page_window = Window_BookPage.new(@left_page_text, false)
    
    if @pages[1] != nil
      @right_page_text = IO.readlines(@directory + @pages[1])
    else
      @right_page_text = [""]
    end
    
    @right_page_window = Window_BookPage.new(@right_page_text, false)
    @right_page_window.x = 320
    
    @scene_index = 0
    if @pages.size > 2
      @scene_index_max = (@pages.size / 2).floor
    else
      @scene_index_max = 0
    end
    
    update_background
    
    play_open
    
    Graphics.transition
    loop do
      Graphics.update
      Input.update
      update
      if $scene != self
        break
      end
    end
    Graphics.freeze
    
    @left_page_window.dispose
    @right_page_window.dispose
    
    @menu_bg.dispose
  end
  
  def update
    @left_page_window.update
    @right_page_window.update
    
    if Input.trigger?(Input::B)
      play_close
      $scene = Scene_Map.new
      return
    end
    
    if Input.trigger?(Input::LEFT)
      return if @scene_index == 0
      @scene_index -= 1
      @left_page_window.back_page
      @right_page_window.back_page
      update_background
      play_turn
      return
    end
    
    if Input.trigger?(Input::RIGHT)
      return if @scene_index == @scene_index_max
      @scene_index += 1
      @left_page_window.next_page
      @right_page_window.next_page
      update_background
      play_turn
      return
    end
  end
  
  def update_background
    if @scene_index_max > @scene_index
      if @scene_index > 0
        @menu_bg.bitmap = RPG::Cache.picture("Book-Both")
      else
        @menu_bg.bitmap = RPG::Cache.picture("Book-More")
      end
    else
      if @scene_index > 0
        @menu_bg.bitmap = RPG::Cache.picture("Book-Less")
      else
        @menu_bg.bitmap = RPG::Cache.picture("Book-None")
      end
    end
  end
end