import xml.dom.minidom
import sys
import os

def find_node(doc_node, tag_name, attribute_name, attribute_value):
  elements = doc_node.getElementsByTagName(tag_name)
  for element in elements:
    if element.hasAttribute(attribute_name):
      if element.getAttribute(attribute_name) == attribute_value:
        return element

def save_xml_file(doc_node, output_file):
  fp = file(output_file, "w")
  fp.write(doc.toxml())
  fp.close()

def update_counter(doc, text_node, replacement_text):
  text_node.replaceChild(doc.createTextNode(replacement_text), text_node.firstChild)

if __name__ == "__main__":
  doc = xml.dom.minidom.parse(sys.argv[1])
  replacement_text = sys.argv[2]
  output_file = sys.argv[3]

  text_node = find_node(doc, "tspan", "id", "text-to-translate") 
  update_counter(doc, text_node, replacement_text)
  
  save_xml_file(doc, output_file)
  os.system("convert %s %s.translated.png" %(output_file,output_file));
  os.system("rm %s" %(output_file));