#==============================================================================
# ** Scene_File
#------------------------------------------------------------------------------
#  This is a superclass for the save screen and load screen.
#==============================================================================

class Scene_File
  #--------------------------------------------------------------------------
  # * Object Initialization
  #     help_text : text string shown in the help window
  #--------------------------------------------------------------------------
  def initialize(help_text)
    @help_text = help_text
  end
  #--------------------------------------------------------------------------
  # * Main Processing
  #--------------------------------------------------------------------------
  def main
    # Make help window
    @help_window = Window_Help.new
    @help_window.set_text(@help_text)
    # Make save file window
    @savefile_windows = []
    for i in 0..99
      @savefile_windows.push(Window_SaveFile.new(i, make_filename(i)))
    end
    # Select last file to be operated
    @file_index = $game_temp.last_file_index
    @savefile_windows[@file_index].selected = true
	updateVisibleSavefileWindows
    # Execute transition
    Graphics.transition
    # Main loop
    loop do
      # Update game screen
      Graphics.update
      # Update input information
      Input.update
      # Frame update
      update
      # Abort loop if screen is changed
      if $scene != self
        break
      end
    end
    # Prepare for transition
    Graphics.freeze
    # Dispose of windows
    @help_window.dispose
    for i in @savefile_windows
      i.dispose
    end
  end
  #--------------------------------------------------------------------------
  # * Frame Update
  #--------------------------------------------------------------------------
  def update
    # Update windows
    @help_window.update
    for i in @savefile_windows
      i.update
    end
    # If C button was pressed
    if Input.trigger?(Input::ACTION)
      # Call method: on_decision (defined by the subclasses)
      on_decision(make_filename(@file_index))
      $game_temp.last_file_index = @file_index
      return
    end
    # If B button was pressed
    if Input.trigger?(Input::CANCEL)
      # Call method: on_cancel (defined by the subclasses)
      on_cancel
      return
    end
    # If the down directional button was pressed
    if Input.repeat?(Input::DOWN)
      # If the down directional button pressed down is not a repeat,
      # or cursor position is more in front than 3
      if Input.trigger?(Input::DOWN) or @file_index < 99
        # Play cursor SE
        $game_system.se_play($data_system.cursor_se)
        # Move cursor down
        @savefile_windows[@file_index].selected = false
        @file_index = (@file_index + 1)
		if @file_index > 99
			@file_index = 0
		end
        @savefile_windows[@file_index].selected = true
		updateVisibleSavefileWindows
        return
      end
    end
    # If the up directional button was pressed
    if Input.repeat?(Input::UP)
      # If the up directional button pressed down is not a repeat、
      # or cursor position is more in back than 0
      if Input.trigger?(Input::UP) or @file_index > 0
        # Play cursor SE
        $game_system.se_play($data_system.cursor_se)
        # Move cursor up
        @savefile_windows[@file_index].selected = false
        @file_index = (@file_index - 1)
		if @file_index < 0
			@file_index = 99
		end
        @savefile_windows[@file_index].selected = true
		updateVisibleSavefileWindows
        return
      end
    end
  end
  #--------------------------------------------------------------------------
  # * Make File Name
  #     file_index : save file index (0-3)
  #--------------------------------------------------------------------------
  def make_filename(file_index)
    return "Save#{file_index + 1}.rxdata"
  end
  
  def updateVisibleSavefileWindows
		for i in 0..99
			@savefile_windows[i].visible = false
		end
		
		screen_start_index = @file_index - (@file_index % 4)
		for i in screen_start_index..(screen_start_index + 3)
			@savefile_windows[i].visible = true
		end
  end
end
