from __future__ import unicode_literals
from future.builtins import int

from collections import defaultdict
from datetime import datetime, timedelta
from optparse import make_option
import re
from time import mktime, timezone
from xml.dom.minidom import parse
from xml.dom import Node

from django.core.management.base import CommandError
from django.utils.html import linebreaks

from mezzanine.blog.management.base import BaseImporterCommand


class Command(BaseImporterCommand):
    """
    Implements a Wordpress importer. Takes a file path or a URL for the
    Wordpress Extended RSS file.
    """

    option_list = BaseImporterCommand.option_list + (
        make_option("-u", "--url", dest="url", help="URL to import file"),
    )

    def get_text(self, xml, name):
        """
        Gets the element's text value from the XML object provided.
        """
        nodes = xml.getElementsByTagName("wp:comment_" + name)[0].childNodes
        accepted_types = [Node.CDATA_SECTION_NODE, Node.TEXT_NODE]
        return "".join([n.data for n in nodes if n.nodeType in accepted_types])

    def handle_import(self, options):
        """
        Gets the posts from either the provided URL or the path if it
        is local.
        """

        url = options.get("url")
        if url is None:
            raise CommandError("Usage is import_wordpress %s" % self.args)
        try:
            import feedparser
        except ImportError:
            raise CommandError("Could not import the feedparser library.")
        feed = feedparser.parse(url)

        # We use the minidom parser as well because feedparser won't
        # interpret WXR comments correctly and ends up munging them.
        # xml.dom.minidom is used simply to pull the comments when we
        # get to them.
        xml = parse(url)
        xmlitems = xml.getElementsByTagName("item")

        for (i, entry) in enumerate(feed["entries"]):
            # Get a pointer to the right position in the minidom as well.
            xmlitem = xmlitems[i]
            content = linebreaks(self.wp_caption(entry.content[0]["value"]))

            # Get the time struct of the published date if possible and
            # the updated date if we can't.
            pub_date = getattr(entry, "published_parsed", entry.updated_parsed)
            if pub_date:
                pub_date = datetime.fromtimestamp(mktime(pub_date))
                pub_date -= timedelta(seconds=timezone)

            # Tags and categories are all under "tags" marked with a scheme.
            terms = defaultdict(set)
            for item in getattr(entry, "tags", []):
                terms[item.scheme].add(item.term)

            if entry.wp_post_type == "post":
                post = self.add_post(title=entry.title, content=content,
                                     pub_date=pub_date, tags=terms["tag"],
                                     categories=terms["category"],
                                     old_url=entry.id)

                # Get the comments from the xml doc.
                for c in xmlitem.getElementsByTagName("wp:comment"):
                    name = self.get_text(c, "author")
                    email = self.get_text(c, "author_email")
                    url = self.get_text(c, "author_url")
                    body = self.get_text(c, "content")
                    pub_date = self.get_text(c, "date_gmt")
                    fmt = "%Y-%m-%d %H:%M:%S"
                    pub_date = datetime.strptime(pub_date, fmt)
                    pub_date -= timedelta(seconds=timezone)
                    self.add_comment(post=post, name=name, email=email,
                                     body=body, website=url,
                                     pub_date=pub_date)

            elif entry.wp_post_type == "page":
                old_id = getattr(entry, "wp_post_id")
                parent_id = getattr(entry, "wp_post_parent")
                self.add_page(title=entry.title, content=content,
                              tags=terms["tag"], old_id=old_id,
                              old_parent_id=parent_id)

    def wp_caption(self, post):
        """
        Filters a Wordpress Post for Image Captions and renders to
        match HTML.
        """
        for match in re.finditer(r"\[caption (.*?)\](.*?)\[/caption\]", post):
            meta = '<div '
            caption = ''
            for imatch in re.finditer(r'(\w+)="(.*?)"', match.group(1)):
                if imatch.group(1) == 'id':
                    meta += 'id="%s" ' % imatch.group(2)
                if imatch.group(1) == 'align':
                    meta += 'class="wp-caption %s" ' % imatch.group(2)
                if imatch.group(1) == 'width':
                    width = int(imatch.group(2)) + 10
                    meta += 'style="width: %spx;" ' % width
                if imatch.group(1) == 'caption':
                    caption = imatch.group(2)
            parts = (match.group(2), caption)
            meta += '>%s<p class="wp-caption-text">%s</p></div>' % parts
            post = post.replace(match.group(0), meta)
        return post
