include Magick

class PictureEditController < ApplicationController
  
  # To load an image into the PictureEditController, write a method
  # that does the following:
  # * Destroy any current image by calling @photo.destroy
  # * "Sanitize" the filename of the new image if required by calling
  #   sanitize_filename()
  # * Re-initialize the session by calling init_session(new_image_filename)
  # * Create a new Photo object: @photo = Photo.new(session)
  # * Try to load the file: @photo.load(new_image_filename)
  
  # PictureEditController stores data for a single image in the session
  # These filters take care of loading and saving it
  before_filter :load_photo
  after_filter :save_photo
  
  
  def show
  end
  
  # You should not have to override these methods. They are called from
  # the control panel (see _control_panel.rhtml)  
  def rotate_right
    @photo.rotate(90) unless @photo.nil?
    show_photo       
  end
  
  def rotate_left
    @photo.rotate(-90) unless @photo.nil?
    show_photo       
  end
  
  def brighter
    @photo.brighter(true) unless @photo.nil?
    show_photo       
  end
  
  def darker
    @photo.brighter(false)  unless @photo.nil?
    show_photo        
  end
  
  def increase_contrast
    @photo.adjust_contrast(true) unless @photo.nil?
    show_photo   
  end

  def reduce_contrast
    @photo.adjust_contrast(false) unless @photo.nil?
    show_photo    
  end
  
  def crop
    unless @photo.nil?
      if params['crop_button'] == "Preview"
        @photo.preview_crop(params['left'], params['top'], 
                  params['right'], params['bottom'])
      else
        @photo.crop(params['left'], params['top'], 
                  params['right'], params['bottom'])
      end
    end
    show_photo    
  end
  
  def set_max_size
    @photo.set_max_size(params['horiz'], params['vert']) unless @photo.nil?
    show_photo
  end
  
  def more_red
    @photo.adjust_red(true) unless @photo.nil?
    show_photo        
  end
  
  def more_cyan
    @photo.adjust_red(false) unless @photo.nil?
    show_photo       
  end
  
  def more_green
    @photo.adjust_green(true) unless @photo.nil?
    show_photo        
  end
  
  def more_magenta
    @photo.adjust_green(false) unless @photo.nil?
    show_photo        
  end
  
  def more_blue
    @photo.adjust_blue(true) unless @photo.nil?
    show_photo      
  end
  
  def more_yellow
    @photo.adjust_blue(false) unless @photo.nil?
    show_photo       
  end
  
  def enhance_color_contrast
    @photo.enhance_color_contrast unless @photo.nil?
    show_photo
  end
  
  def sharpen
    @photo.sharpen unless @photo.nil?
    show_photo
  end
  
  def reduce_noise
    @photo.reduce_noise unless @photo.nil?
    show_photo    
  end
  
  def undo
    @photo.undo unless @photo.nil?
    show_photo    
  end
  
  def start_over
    @photo.revert unless @photo.nil?
    show_photo    
  end
  
  def finalize
    @photo.refresh_working_copy unless @photo.nil?
    show_photo
  end
  
  private
  
  def sanitize_filename(filename)
    filename = File.basename(filename.gsub("\\", "/")) # work-around for IE
    filename.gsub!(/[^a-zA-Z0-9\.\-\+_]/,"_")
    filename = "_#{filename}" if filename =~ /^\.+$/
    filename = "unnamed" if filename.size == 0
    filename
  end
  
  
  def init_session(photo_file_name)
    @session[:photo_params] = nil
    @session[:f_name] = photo_file_name
  end
  
  def load_photo
    if !@session[:f_name].blank?
      @photo = Photo.new(@session)
    else
      @photo = nil
    end
  end
  
  def save_photo
    @photo.save(@session) unless @photo.nil?
  end
  
  def show_photo
    render :partial => 'photo'
  end
  
end