class Graph < Eruta::Graph
  class Node
    attr_accessor :id
  
    def initialize(id) 
      @id = id
      Graph.register(self)
    end
  
    def background_color=(col)
      r, g, b, a = *col
      a ||= 255
      Eruta::Graph.background_color_(@id, r, g, b, a)
    end
  
    def border_color=(col)
      r, g, b, a = *col
      a ||= 255
      Eruta::Graph.border_color_(@id, r, g, b, a)
    end
  
    def color=(col)
      r, g, b, a = *col
      a ||= 255
      Eruta::Graph.color_(@id, r, g, b, a)
    end
  
    def border_thickness=(t)
      Eruta::Graph.border_thickness_(@id, t)
    end

      
    def margin=(m)
      Eruta::Graph.margin_(@id, m)
    end
  
    def angle=(a)
      Eruta::Graph.angle_(@id, r, g, b, a)
    end
    
    def image_flags=(f)
      Eruta::Graph.image_flags_(@id,f)
    end
    
    def text_flags=(f)
      Eruta::Graph.text_flags_(@id, f)
    end

        
    #~ def text=(t)
      #~ Eruta::Graph.text_(@id, t)
    #~ end

  
    def size=(size)
      w, h = *size
      Eruta::Graph.size_(@id, w, h)
    end
  
    def visible=(value) 
      Eruta::Graph.visible_(@id, value ? 1 : 0)
    end
  
    def z
      Eruta::Graph.z(@id)
    end
  
    def z=(newz)
      Eruta::Graph.z_(@id, newz)
    end
  
    def font=(store_id) 
      Eruta::Graph.font_(@id, store_id)
    end
  
    def image=(store_id) 
      Eruta::Graph.image_(@id, store_id)
    end
  
    def background_image=(store_id) 
      Eruta::Graph.background_image_(@id, store_id)
    end
  
    def speed=(v) 
      x, y = *v
      Eruta::Graph.speed_(@id, x, y)
    end
  
    def size=(sz) 
      x, y = *sz
      Eruta::Graph.size_(@id, x, y)
    end
  
    def position=(p) 
      x, y = *p
      Eruta::Graph.position_(@id, x, y)
    end

    def line_stop=(stop) 
      Eruta::Graph.line_stop_(@id, store_id)
    end

    # Forwards methods to Eruta::Graph(@id, * args)
    def self.forward_graph(name)
      clean_name = name.to_s
      prefix     = clean_name[0, clean_name.size - 1]
      if clean_name[-1] == "!"
        clean_name = prefix + '_bang' 
      elsif clean_name[-1] == "?"
        clean_name = prefix + '_p' 
      elsif clean_name[-1] == "="
        clean_name = prefix +  '_'
      end
      # p "graph", name, clean_name
      graph_name = "#{clean_name}".to_sym
      define_method(name)  do |*args|   
        Eruta::Graph.send(graph_name, @id, *args)
      end
    end

    
    
    forward_graph :text=
    forward_graph :line_start=
    forward_graph :line_stop=
    forward_graph :delay=    
    forward_graph :line_start
    forward_graph :line_stop
    forward_graph :delay
    forward_graph :page_lines=
    forward_graph :page_lines
    forward_graph :paused=
    forward_graph :paused
    forward_graph :page=
    forward_graph :page
    forward_graph :last_page
    forward_graph :next_page
    forward_graph :previous_page
    forward_graph :at_end?

  
    def close() 
      Graph.unregister(self)
      @id = nil
    end

  end

  def self.registry
    @registry ||= {}
  end

  def self.register(thing)
    @registry ||= {}
    @registry[thing.id] = thing
  end


  def self.unregister(thing)
    @registry ||= {}
    @registry[thing.id] = nil
    Graph.disable(thing.id) 
    thing = nil
  end
  
  def self.get_unused_id
    29000.times do | i | 
      return i unless self.registry[i]
    end
    return nil
  end

  def self.make_box(x, y, w, h, rx = 4, ry = 4, style_id = -1)
    id  = self.get_unused_id
    nid = Eruta::Graph.make_box(id, x, y, w, h, rx, ry, style_id) 
    return nil if (nid < 0)
    return Node.new(nid)
  end

  def self.make_image_ex(x, y, w, h, store_id, style_id = -1)
    id  = self.get_unused_id
    nid = Eruta::Graph.make_image(id, x, y, w, h, store_id, style_id)
    return nil if (nid < 0)
    return Node.new(nid)
  end

  def self.make_image(x, y, store_id, style_id = -1)
    id  = self.get_unused_id
    nid = Eruta::Graph.make_image(id, x, y, -1, -1, store_id, style_id)
    return nil if (nid < 0)
    return Node.new(nid)
  end


  def self.make_text(x, y, w, h, text, style_id = -1)
    id  = self.get_unused_id
    nid = Eruta::Graph.make_text(id, x, y, w, h, text, style_id)
    return nil if (nid < 0)
    return Node.new(nid)
  end

  def self.make_longtext(x, y, w, h, text, style_id = -1)
    id  = self.get_unused_id
    nid = Eruta::Graph.make_longtext(id, x, y, w, h, text, style_id)
    return nil if (nid < 0)
    return Node.new(nid)
  end
  
end