import os
from xml.dom.minidom import parse, parseString
from dynastie.generators.generator import DynastieGenerator
from dynastie.generators.index import Index
from django.db import models

class Category(Index):

    cur_page = 0
    nb_pages = 0
    cur_article = 0
    articles_per_page = 0
    filename = 'category'
    cur_category = None

    def createCategory(self, articles, dom, root, node):
        if node.hasAttribute('name'):
            self.replaceByText(dom, root, node, self.cur_category.name)
        if node.hasAttribute('description'):
            self.replaceByText(dom, root, node, self.cur_category.description)

    def generate(self, blog, src, output):
        from dynastie.models import Article, Blog, Category

        hooks = {'articles' : self.createArticles,
                 'navigation' : self.createNavigation,
                 'category' : self.createCategory}

        if not os.path.exists(src + '/_category.html'):
            self.addError('No _category.html found, exiting')
            return self.report

        try:
            dom = parse(src + '/_category.html')
        except xml.dom.DOMException as e:
            self.addError('Error parsing _category.html : ' + e)
            return self.report
            
        if not os.path.exists(output + '/category'):
            os.mkdir(output + '/category')

        article_nodes = dom.getElementsByTagNameNS(self.URI, "articles")
        if not article_nodes is None:
            if article_nodes[0].hasAttribute("limit"):
                self.articles_per_page = int(article_nodes[0].getAttribute("limit"))
            else:
                self.articles_per_page = 5
        else:
            self.addError('No tag dyn:articles found')

        categories = Category.objects.all()

        for category in categories:
            self.cur_category = category
            self.filename = category.name_slug
            filename = self.filename + '.html'
            articles = Article.objects.filter(category__exact=category).order_by('-creation_date')

            self.nb_pages = 0
            self.cur_page = 0
            if articles.count() > self.articles_per_page:
                self.nb_pages = articles.count() / self.articles_per_page

            while self.cur_page <= self.nb_pages:
                #print 'Generate ' + filename
                nodes = dom.getElementsByTagName("*")
                self.parse(hooks, articles, dom, nodes[0])
                self.writeIfNotTheSame(output + '/category/' + filename, nodes[0].toxml('utf8'))
                self.cur_page = self.cur_page + 1
                filename = self.filename + str(self.cur_page) + '.html'
                dom = parse(src + '/_category.html')

            while os.path.exists(filename):
                self.addReport('Removing unused ' + filename)
                os.unlink(filename)
                filename = filename + '.gz'
                if os.path.exists(filename):
                    self.addReport('Removing unused ' + filename)
                    os.unlink(filename)
                self.cur_page = self.cur_page + 1
                filename = output + '/category/' + self.filename + str(self.cur_page) + '.html'

        if not self.somethingWrote:
            self.addReport('Nothing changed')

        return self.report