import zipfile
import StringIO

from django import http
from django.template import Context, Template


def print_odf( request, odf_path, context ):
    """
      odf_path - path to the template document
      context - dictionary to create context from
    """
    c = Context()
    for key, value in context.items():
        if callable( value ):
            c[key] = value()
        else:
            c[key] = value
       
    # default mimetype
    mimetype = 'application/vnd.oasis.opendocument.text'
    # ODF is just a zipfile
    input = zipfile.ZipFile( template_name, "r" )
    # we cannot write directly to HttpResponse, so use StringIO
    text = StringIO.StringIO()
    # output document
    output = zipfile.ZipFile( text, "a" )
       
    # go through the files in source
    for zi in input.filelist:
        out = input.read( zi.filename )
        # waut for the only interesting file
        if zi.filename == 'content.xml':
            # un-escape the quotes (in filters etc.)
            t = Template( out.replace( '"', '"' ) ) 
            # render the document
            out = t.render( c ) 
        elif zi.filename == 'mimetype':
            # mimetype is stored within the ODF
            mimetype = out 
        output.writestr( zi.filename, out )

    # close and finish
    output.close()
    return http.HttpResponse( content=text.getvalue(), mimetype=mimetype )