import requests
import random
from django.conf import settings
from urllib import quote
from functools import partial
from xml.etree import ElementTree


from . exceptions import BooXtreamError
from . models import Boox


class BooXtream(object):
    """ ``apikey``

          The API key for your BooXtream account, obtained from BooXtream. Defaults to using 
          settings.BOOXTREAM_API_KEY

        ``apiuser``

          The username key for your BooXtream account, obtained from BooXtream. Defaults to using 
          settings.BOOXTREAM_API_USER
          
          
        ``timeout``
        
        passed to requests
    """
    def __init__(self,
                 apikey='', apiuser='',
                 timeout=None,
                 **params):
        if not apikey:
            apikey = settings.BOOXTREAM_API_KEY
        if not apiuser:
            apiuser = settings.BOOXTREAM_API_USER
        self.endpoint = 'http://service.booxtream.com/'
        self.postrequest = partial(requests.post, timeout=timeout, auth=(apiuser,apikey))
        

    def platform(self,  epubfile=None, epub=True, kf8mobi=False,  **kwargs):
        """ Make an API request to BooXtream 
        ``self.apikey``, ``epubfile`` and the supplied ``kwargs``.
        Attempts to deserialize the XML response and return the download link.

        Will raise ``BooXtreamError`` if BooXtream returns an exception
        code.
        """
        url = self.endpoint + 'booxtream.xml' 
        kwargs['epub'] =  '1' if epub else '0'
        kwargs['kf8mobi'] = '1' if kf8mobi else '0'
        if epubfile:
            if hasattr(epubfile,'name') and str(epubfile.name).endswith('.epub'):
                files= {'epubfile': (str(epubfile.name),epubfile)}
            else:
                # give it a random file name so that kindlegen doesn't choke 
                # needed for in-memory (StringIO) epubs 
                files= {'epubfile': ('%012x.epub' % random.randrange(16**12),epubfile)}
        else:
             files={}      
        if settings.LOCAL_TEST:
            # fake it, so you can test other functions without hitting booxtream
            boox = Boox.objects.create(
                    download_link_epub='https://github.com/eshellman/42_ebook/blob/master/download/42.epub?raw=true', 
                    download_link_mobi='https://github.com/eshellman/42_ebook/blob/master/download/42.mobi?raw=true', 
                    referenceid= kwargs.get('referenceid'),
                    downloads_remaining= kwargs.get('downloadlimit'),
                    expirydays=kwargs.get('expirydays'),
                )
            return boox

        resp = self.postrequest(url, data=kwargs, files=files)
        doc = ElementTree.fromstring(resp.content)

        # it turns out an Error can have an Error in it
        errors = doc.findall('.//Response/Error') 
        if len(errors) > 0:
            raise BooXtreamError(errors)
        download_link_epub = doc.find('.//DownloadLink[@type="epub"]')
        if download_link_epub is not None:
            download_link_epub = download_link_epub.text  
        download_link_mobi = doc.find('.//DownloadLink[@type="mobi"]')
        if download_link_mobi is not None:
            download_link_mobi = download_link_mobi.text 
        boox = Boox.objects.create(
                download_link_epub=download_link_epub, 
                download_link_mobi=download_link_mobi, 
                referenceid= kwargs.get('referenceid'),
                downloads_remaining= kwargs.get('downloadlimit'),
                expirydays=kwargs.get('expirydays'),
            )
        return boox