#! /usr/bin/env python
#-*- coding: utf-8 -*-

# Newspipe - A Web based news aggregator.
# Copyright (C) 2010-2016  Cédric Bonhomme - https://www.cedricbonhomme.org
#
# For more information : https://github.com/newspipe/newspipe
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

__author__ = "Cedric Bonhomme"
__version__ = "$Revision: 0.1 $"
__date__ = "$Date: 2016/11/17 $"
__revision__ = "$Date: 2016/11/17 $"
__copyright__ = "Copyright (c) Cedric Bonhomme"
__license__ = "AGPLv3"

#
# This file contains the import/export functions of Newspipe.
#

import json
import opml
import datetime
from flask import jsonify

from bootstrap import db
from web.models import User, Feed, Article


def import_opml(email, opml_content):
    """
    Import new feeds from an OPML file.
    """
    user = User.query.filter(User.email == email).first()
    try:
        subscriptions = opml.from_string(opml_content)
    except:
        logger.exception("Parsing OPML file failed:")
        raise

    def read(subsubscription, nb=0):
        """
        Parse recursively through the categories and sub-categories.
        """
        for subscription in subsubscription:
            if len(subscription) != 0:
                nb = read(subscription, nb)
            else:
                try:
                    title = subscription.text
                except:
                    title = ""
                try:
                    description = subscription.description
                except:
                    description = ""
                try:
                    link = subscription.xmlUrl
                except:
                    continue
                if None != Feed.query.filter(Feed.user_id == user.id, Feed.link == link).first():
                    continue
                try:
                    site_link = subscription.htmlUrl
                except:
                    site_link = ""
                new_feed = Feed(title=title, description=description,
                                link=link, site_link=site_link,
                                enabled=True)
                user.feeds.append(new_feed)
                nb += 1
        return nb
    nb = read(subscriptions)
    db.session.commit()
    return nb


def import_json(email, json_content):
    """
    Import an account from a JSON file.
    """
    user = User.query.filter(User.email == email).first()
    json_account = json.loads(json_content.decode("utf-8"))
    nb_feeds, nb_articles = 0, 0
    # Create feeds:
    for feed in json_account["result"]:
        if None != Feed.query.filter(Feed.user_id == user.id,
                                    Feed.link == feed["link"]).first():
            continue
        new_feed = Feed(title=feed["title"],
                        description="",
                        link=feed["link"],
                        site_link=feed["site_link"],
                        created_date=datetime.datetime.
                            fromtimestamp(int(feed["created_date"])),
                        enabled=feed["enabled"])
        user.feeds.append(new_feed)
        nb_feeds += 1
    db.session.commit()
    # Create articles:
    for feed in json_account["result"]:
        user_feed = Feed.query.filter(Feed.user_id == user.id,
                                        Feed.link == feed["link"]).first()
        if None != user_feed:
            for article in feed["articles"]:
                if None == Article.query.filter(Article.user_id == user.id,
                                    Article.feed_id == user_feed.id,
                                    Article.link == article["link"]).first():
                    new_article = Article(entry_id=article["link"],
                                link=article["link"],
                                title=article["title"],
                                content=article["content"],
                                readed=article["readed"],
                                like=article["like"],
                                retrieved_date=datetime.datetime.
                                    fromtimestamp(int(article["retrieved_date"])),
                                date=datetime.datetime.
                                    fromtimestamp(int(article["date"])),
                                user_id=user.id,
                                feed_id=user_feed.id)
                    user_feed.articles.append(new_article)
                    nb_articles += 1
    db.session.commit()
    return nb_feeds, nb_articles


def export_json(user):
    """
    Export all articles of user in JSON.
    """
    result = []
    for feed in user.feeds:
        result.append({
                        "title": feed.title,
                        "description": feed.description,
                        "link": feed.link,
                        "site_link": feed.site_link,
                        "enabled": feed.enabled,
                        "created_date": feed.created_date.strftime('%s'),
                        "articles": [ {
                            "title": article.title,
                            "link": article.link,
                            "content": article.content,
                            "readed": article.readed,
                            "like": article.like,
                            "date": article.date.strftime('%s'),
                            "retrieved_date": article.retrieved_date.strftime('%s')
                        } for article in feed.articles ]
                    })
    return jsonify(result=result)