#!/usr/bin/env python

# Written by Tavmjong Bah

import inkex

class C(inkex.Effect):
  def __init__(self):
    inkex.Effect.__init__(self)
    self.OptionParser.add_option("-s", "--spine", action="store", type="string", dest="dvd_cover_spine", default="normal", help="Dvd spine width")
    self.OptionParser.add_option("-b", "--bleed", action="store", type="float", dest="dvd_cover_bleed", default="3", help="Bleed (extra area around image")

  def create_horizontal_guideline(self, name, position):
    self.create_guideline(name, "0,1", 0, position)

  def create_vertical_guideline(self, name, position):
    self.create_guideline(name, "1,0", position, 0)

  def create_guideline(self, label, orientation, x,y):
    namedview = self.root.find(inkex.addNS('namedview', 'sodipodi'))
    guide = inkex.etree.SubElement(namedview, inkex.addNS('guide', 'sodipodi'))
    guide.set("orientation", orientation)
    guide.set("position", str(x)+","+str(y))
    # No need to set label (causes translation problems, etc.)
    # guide.set(inkex.addNS('label', 'inkscape'), label)

  def effect(self):

    # Dimensions in mm
    width  = 259.0  # Before adding spine width or bleed
    height = 183.0  # Before adding bleed

    bleed = self.options.dvd_cover_bleed
    spine = float( self.options.dvd_cover_spine )

    width  += spine
    width  += 2.0 * bleed
    height += 2.0 * bleed

    self.root = self.document.getroot()
    self.root.set("id", "SVGRoot")
    self.root.set("width",  str(width) + 'mm')
    self.root.set("height", str(height) + 'mm')
    self.root.set("viewBox", "0 0 " + str(width) + " " + str(height) )

    namedview = self.root.find(inkex.addNS('namedview', 'sodipodi'))
    if namedview is None:
        namedview = inkex.etree.SubElement( self.root, inkex.addNS('namedview', 'sodipodi') );
     
    namedview.set(inkex.addNS('document-units', 'inkscape'), "mm")

    # Until units are supported in 'cx', etc.
    namedview.set(inkex.addNS('cx', 'inkscape'), str(self.uutounit( width,  'px' )/2.0 ) )
    namedview.set(inkex.addNS('cy', 'inkscape'), str(self.uutounit( height, 'px' )/2.0 ) )

    self.create_horizontal_guideline("bottom",     str(self.uutounit( bleed,        'px' )) )
    self.create_horizontal_guideline("top",        str(self.uutounit( height-bleed, 'px' )) )
    self.create_vertical_guideline("left edge",    str(self.uutounit( bleed,        'px' )) )
    self.create_vertical_guideline("left spline",  str(self.uutounit( (width-spine)/2.0,'px' )) )
    self.create_vertical_guideline("right spline", str(self.uutounit( (width+spine)/2.0,'px' )) )
    self.create_vertical_guideline("left edge",    str(self.uutounit( width-bleed,  'px' )) )

c = C()
c.affect()