import os
from datetime import datetime
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 Archive(Index):

    cur_page = 0
    nb_pages = 0
    cur_article = 0
    articles_per_page = 0
    filename = 'index'
    cur_year = 0

    def createArchive(self, articles, dom, root, node):
        if node.hasAttribute('year'):
            self.replaceByText(dom, root, node, str(self.cur_year))

    def createArchives(self, src, output, dom, hooks, articles):
        filename = self.filename + '.html'
        self.nb_pages = 0
        self.cur_page = 0
        self.cur_article = 0

        if len(articles) > self.articles_per_page:
            self.nb_pages = len(articles) / self.articles_per_page
                
        if not os.path.exists(output + '/archive/' + str(self.cur_year)):
            os.mkdir(output + '/archive/' + str(self.cur_year))

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

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

        hooks = {'articles' : self.createArticles,
                 'navigation' : self.createNavigation,
                 'archive' : self.createArchive}

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

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

        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')

        articles = Article.objects.all().order_by('creation_date')

        if articles.count() != 0:
            self.cur_year = int(articles[0].creation_date.year)

        my_articles = []
        now = datetime.now()
        nb_articles = len(articles)
        for i in range(0, nb_articles):
            if self.cur_year == now.year:
                break

            if i < nb_articles-1:
                if articles[i].creation_date.year != articles[i+1].creation_date.year:
                    dom = parse(src + '/_archive.html')
                    self.createArchives(src, output, dom, hooks, my_articles)
                    self.cur_year = int(articles[i+1].creation_date.year)
                    #print 'New year ' + str(self.cur_year)
                    my_articles = []
                    if self.cur_year == int(now.year):
                        break
                else:
                    my_articles.append(articles[i])
            else:
                # Last article
                my_articles.append(article)
                if nb_articles != 1 and articles[i].creation_date.year != articles[i-1].creation_date.year:
                    self.cur_year = int(articles[i].creation_date.year)

        if len(my_articles) != 0:
            self.createArchives(src, output, dom, hooks, my_articles)

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

        return self.report