'''
    Care about office's formats
'''

import os
import mimetypes
import subprocess
import tempfile
import glob
import logging
import zipfile
import re
import shutil
from xml.etree import ElementTree

try:
    import cairo
    import poppler
except ImportError:
    pass

import mat
import parser
import archive


class OpenDocumentStripper(archive.GenericArchiveStripper):
    '''
        An open document file is a zip, with xml file into.
        The one that interest us is meta.xml
    '''

    def get_meta(self):
        '''
            Return a dict with all the meta of the file
        '''
        zipin = zipfile.ZipFile(self.filename, 'r')
        metadata = {}
        try:
            content = zipin.read('meta.xml')
            zipin.close()
            tree = ElementTree.fromstring(content)
            for node in tree.iter():
                key = re.sub('{.*}', '', node.tag)
                metadata[key] = node.text
        except KeyError:  # no meta.xml file found
            logging.debug('%s has no opendocument metadata' % self.filename)
        return metadata

    def _remove_all(self, method):
        '''
            FIXME ?
            There is a patch implementing the Zipfile.remove()
            method here : http://bugs.python.org/issue6818
        '''
        zipin = zipfile.ZipFile(self.filename, 'r')
        zipout = zipfile.ZipFile(self.output, 'w',
            allowZip64=True)
        for item in zipin.namelist():
            name = os.path.join(self.tempdir, item)
            if item.endswith('.xml') or item == 'mimetype':
                #keep .xml files, and the "manifest" file
                if item != 'meta.xml':  # contains the metadata
                    zipin.extract(item, self.tempdir)
                    zipout.write(name, item)
                    mat.secure_remove(name)
            elif item.endswith('manifest.xml'):
                zipin.extract(item, self.tempdir)
                #remove line meta.xml
                zipout.write(name, item)
                mat.secure_remove(name)
            else:
                zipin.extract(item, self.tempdir)
                if os.path.isfile(name):
                    try:
                        cfile = mat.create_class_file(name, False,
                            self.add2archive)
                        if method == 'normal':
                            cfile.remove_all()
                        else:
                            cfile.remove_all_ugly()
                        logging.debug('Processing %s from %s' % (item,
                            self.filename))
                        zipout.write(name, item)
                    except:
                        logging.info('%s\' fileformat is not supported' % item)
                        if self.add2archive:
                            zipout.write(name, item)
                    mat.secure_remove(name)
        zipout.comment = ''
        logging.info('%s treated' % self.filename)
        zipin.close()
        zipout.close()
        self.do_backup()

    def is_clean(self):
        '''
            Check if the file is clean from harmful metadatas
        '''
        zipin = zipfile.ZipFile(self.filename, 'r')
        try:
            zipin.getinfo('meta.xml')
            return False
        except KeyError:  # no meta.xml in the file
                zipin.close()
                czf = archive.ZipStripper(self.filename, self.parser,
                    'application/zip', self.backup, self.add2archive)
                if czf.is_clean():
                    return True
                else:
                    return False
        return True

class PdfStripper(parser.GenericParser):
    '''
        Represent a pdf file
    '''
    def is_clean(self):
        #FIXME
        return False

    def remove_all(self):
        #FIXME
        self.remove_all_ugly()

    def remove_all_ugly(self):
        '''
            Opening the pdf with poppler, then doing a render
            on a cairo pdfsurface.
        '''
        uri = 'file://' + self.filename
        password = None
        document = poppler.document_new_from_file(uri, password)
        page = document.get_page(0)
        page_width, page_height = page.get_size()
        surface = cairo.PDFSurface(self.output, page_width, page_height)
        context = cairo.Context(surface)
        for i in xrange(document.get_n_pages()):
            page = document.get_page(i)
            context.translate(0, 0)
            page.render(context)
            context.show_page()
        surface.finish()

    def get_meta(self):
        metadata={}
        meta_list=('title', 'author', 'subject', 'keywords', 'creator',
            'producer', 'creation-date', 'mod-date', 'metadata')
        uri = 'file://' + self.filename
        password = None
        document = poppler.document_new_from_file(uri, password)
        for key in meta_list:
            self._get_meta(document, metadata, key)
        return metadata

    def _get_meta(self, document, metadata, key):
        if document.get_property(key) is not None:
            metadata[key] = document.get_property(key)