#! /usr/bin/python3 -t 

MODULE_NAME = "mformula"
MODULE_DESC = "Utility function to create a formula image and its description"
MODULE_VERS = "1.0"

MODULE_COPYRIGHT = "Copyright © 2020-09-04 by the State University of Campinas (UNICAMP)"

import mformula
import mformula_svg

def write_image_and_descr(md,style,back,prefix, *args):
  """The parameter {md} should be a module with three functions: 
    
    {buld_formula(svg,*args)} that returns an {mformula.obj} object,
    
    {image_name(svg,*args)} that resturns the full name of the image, and
    
    {image_descr(svg,*args)} that returns its description.
  
  The {style} is passed to {mformula_svg.obj()} and is one of "B1", "B2", "S1", etc.
  The {*args} are optional parameters for {build_formula}. The resuts of by {image_name} 
  and {image_descr} must depend on {svg.style} and those parameters. 
  
  This function writes two files called "{prefix}_{iname}.svg" and "{prefix}{iname}_descr.txt"
  containing the formula's image in SVG format, where {iname}  is the name returned
  by {image_name(svg,*args)}."""
  
  iname = md.image_name(style,*args)

  wr = open(prefix + iname + '.svg', 'w')
  svg = mformula_svg.obj(wr,style,back)
  fm = md.build_formula(svg, *args)
  svg.output_figure(fm)
  wr.close()

  wr = open(prefix + iname + '_descr.txt', 'w')
  idescr = md.image_descr(style,*args)
  wr.buffer.write(idescr.encode('utf8'))
  wr.write("\n")
  wr.close()