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

# pyAggr3g470r - A Web based news aggregator.
# Copyright (C) 2010-2013  Cédric Bonhomme - http://cedricbonhomme.org/
#
# For more information : http://bitbucket.org/cedricbonhomme/pyaggr3g470r/
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>

__author__ = "Cedric Bonhomme"
__version__ = "$Revision: 4.2 $"
__date__ = "$Date: 2010/01/29 $"
__revision__ = "$Date: 2013/11/22 $"
__copyright__ = "Copyright (c) Cedric Bonhomme"
__license__ = "GPLv3"

import datetime

from flask import render_template, request, make_response, flash, session, url_for, redirect, g
from wtforms import TextField, PasswordField, SubmitField, validators
from flask.ext.login import LoginManager, login_user, logout_user, login_required, current_user, AnonymousUserMixin
from collections import defaultdict

from forms import SigninForm, AddFeedForm, ProfileForm
from pyaggr3g470r import app, db

import conf
import utils
import export
import feedgetter
import models
import search as fastsearch


login_manager = LoginManager()
login_manager.init_app(app)

@app.before_request
def before_request():
    g.user = current_user
    if g.user.is_authenticated():
        pass
        #g.user.last_seen = datetime.utcnow()
        #db.session.add(g.user)
        #db.session.commit()

@app.errorhandler(403)
def authentication_failed(e):
    flash('Authentication failed.', 'danger')
    return redirect(url_for('login'))

@app.errorhandler(401)
def authentication_failed(e):
    flash('Authentication required.', 'info')
    return redirect(url_for('login'))

@login_manager.user_loader
def load_user(email):
    # Return an instance of the User model
    return models.User.objects(email=email).first()

@app.route('/login/', methods=['GET', 'POST'])
def login():
    g.user = AnonymousUserMixin()
    form = SigninForm()

    if form.validate_on_submit():
        user = models.User.objects(email=form.email.data).first()
        login_user(user)
        g.user = user
        flash("Logged in successfully.", 'success')
        return redirect(url_for('home'))
    return render_template('login.html', form=form)

@app.route('/logout/')
@login_required
def logout():
    """
    Remove the user information from the session.
    """
    logout_user()
    flash("Logged out successfully.", 'success')
    return redirect(url_for('home'))





@app.route('/')
@login_required
def home():
    """
    The home page lists most recent articles of all feeds.
    """
    user = g.user
    feeds = models.User.objects(email=g.user.email).fields(slice__feeds__articles=9).first().feeds
    return render_template('home.html', user=user, feeds=feeds)

@app.route('/fetch/', methods=['GET'])
@login_required
def fetch():
    """
    Triggers the download of news.
    """
    feed_getter = feedgetter.FeedGetter(g.user.email)
    feed_getter.retrieve_feed()
    flash("New articles retrieved.", 'success')
    return redirect(url_for('home'))

@app.route('/about/', methods=['GET'])
@login_required
def about():
    """
    'About' page.
    """
    return render_template('about.html')

@app.route('/feeds/', methods=['GET'])
@login_required
def feeds():
    """
    Lists the subscribed  feeds in a table.
    """
    feeds = models.User.objects(email=g.user.email).first().feeds
    return render_template('feeds.html', feeds=feeds)

@app.route('/feed/<feed_id>', methods=['GET'])
@login_required
def feed(feed_id=None):
    """
    Presents detailed information about a feed.
    """
    word_size = 6
    user = models.User.objects(email=g.user.email, feeds__oid=feed_id).first()
    for feed in user.feeds:
        if str(feed.oid) == feed_id:
            articles = feed.articles
            top_words = utils.top_words(articles, n=50, size=int(word_size))
            tag_cloud = utils.tag_cloud(top_words)
            return render_template('feed.html', head_title=feed.title, feed=feed, tag_cloud=tag_cloud)

@app.route('/article/<article_id>', methods=['GET'])
@login_required
def article(article_id=None):
    """
    Presents the content of an article.
    """
    #user = models.User.objects(email=g.user.email, feeds__oid=feed_id).first()
    article = models.Article.objects(id=article_id).first()
    if not article.readed:
        article.readed = True
        article.save()
    return render_template('article.html', head_title=article.title, article=article)

@app.route('/mark_as_read/', methods=['GET'])
@login_required
def mark_as_read():
    """
    Mark all unreaded articles as read.
    """
    #user = models.User.objects(email=g.user.email).first()
    models.Article.objects(readed=False).update(set__readed=True)
    return redirect(url_for('home'))

@app.route('/like/<article_id>', methods=['GET'])
@login_required
def like(article_id=None):
    """
    Mark or unmark an article as favorites.
    """
    #user = models.User.objects(email=g.user.email).first()
    models.Article.objects(id=article_id).update(set__like= \
                                        (not models.Article.objects(id=article_id).first().like))
    return redirect("/article/"+article_id)

@app.route('/delete/<article_id>', methods=['GET'])
@login_required
def delete(article_id=None):
    """
    Delete an article.
    """
    user = models.User.objects(email=g.user.email).first()
    # delete the article
    for feed in user.feeds:
        for article in feed.articles:
            if str(article.id) == article_id:
                feed.articles.remove(article)
                article.delete()
                user.save()
                flash('Article "' + article.title + '" deleted.', 'success')
                return redirect(url_for('home'))
    flash('Impossible to delete the article.', 'danger')
    return redirect(url_for('home'))

@app.route('/articles/<feed_id>', methods=['GET'])
@login_required
def articles(feed_id=None):
    user = models.User.objects(email=g.user.email, feeds__oid=feed_id).first()
    for feed in user.feeds:
        if str(feed.oid) == feed_id:
            return render_template('articles.html', feed=feed)

@app.route('/favorites/', methods=['GET'])
@login_required
def favorites():
    user = models.User.objects(email=g.user.email).first()
    result = []
    for feed in user.feeds:
        feed.articles = [article for article in feed.articles if article.like]
        if len(feed.articles) != 0:
            result.append(feed)
    return render_template('favorites.html', feeds=result)

@app.route('/unread/', methods=['GET'])
@login_required
def unread():
    user = models.User.objects(email=g.user.email).first()
    result = []
    for feed in user.feeds:
        feed.articles = [article for article in feed.articles if not article.readed]
        if len(feed.articles) != 0:
            result.append(feed)
    return render_template('unread.html', feeds=result)

@app.route('/inactives/', methods=['GET'])
@login_required
def inactives():
    """
    List of inactive feeds.
    """
    nb_days = int(request.args.get('nb_days', 365))
    user = models.User.objects(email=g.user.email).first()
    today = datetime.datetime.now()
    inactives = []
    for feed in user.feeds:
        last_post = feed.articles[0].date
        elapsed = today - last_post
        if elapsed > datetime.timedelta(days=nb_days):
            inactives.append((feed, elapsed))
    return render_template('inactives.html', inactives=inactives, nb_days=nb_days)

@app.route('/index_database/', methods=['GET'])
@login_required
def index_database():
    """
    Index all the database.
    """
    user = models.User.objects(email=g.user.email).first()
    fastsearch.create_index(user.feeds)
    return redirect(url_for('home'))

@app.route('/export/', methods=['GET'])
@login_required
def export_articles():
    """
    Export all articles.
    """
    user = models.User.objects(email=g.user.email).first()
    try:
        archive_file, archive_file_name = export.export_html(user.feeds)
    except:
        flash("Error when exporting articles.", 'danger')
        return redirect(url_for('management'))
    response = make_response(archive_file)
    response.headers['Content-Type'] = 'application/x-compressed'
    response.headers['Content-Disposition'] = 'attachment; filename='+archive_file_name
    return response

@app.route('/search/', methods=['GET'])
@login_required
def search():
    user = models.User.objects(email=g.user.email).first()
    result = []
    query = request.args.get('query', None)
    if query != None:
        results, nb_articles = fastsearch.search(query)
        for feed_id in results:
            for feed in user.feeds:
                if str(feed.oid) == feed_id:
                    feed.articles = []
                    for article_id in results[feed_id]:
                        current_article = models.Article.objects(id=article_id).first()
                        feed.articles.append(current_article)
                    feed.articles = sorted(feed.articles, key=lambda t: t.date, reverse=True)
                    result.append(feed)
    return render_template('search.html', feeds=result, nb_articles=nb_articles, query=query)

@app.route('/management/', methods=['GET'])
@login_required
def management():
    form = AddFeedForm()
    user = models.User.objects(email=g.user.email).first()
    nb_feeds = len(user.feeds)
    #nb_articles = sum([len(feed.articles) for feed in user.feeds])
    #nb_unread_articles = sum([len([article for article in feed.articles if not article.readed]) for feed in user.feeds])
    nb_articles = len(models.Article.objects())
    nb_unread_articles = len(models.Article.objects(readed=False))
    return render_template('management.html', form=form, \
                            nb_feeds=nb_feeds, nb_articles=nb_articles, nb_unread_articles=nb_unread_articles)

@app.route('/history/', methods=['GET'])
@login_required
def history():
    user = models.User.objects(email=g.user.email).first()
    return render_template('history.html')

@app.route('/edit_feed/', methods=['GET', 'POST'])
@app.route('/edit_feed/<feed_id>', methods=['GET', 'POST'])
@login_required
def edit_feed(feed_id=None):
    """
    Add or edit a feed.
    """
    user = models.User.objects(email=g.user.email).first()
    form = AddFeedForm()

    if request.method == 'POST':
        if form.validate() == False:
            return render_template('edit_feed.html', form=form)
        if feed_id != None:
            # Edit an existing feed
            for feed in user.feeds:
                if str(feed.oid) == feed_id:
                    form.populate_obj(feed)
                    user.save()
                    flash('Feed "' + feed.title + '" successfully updated.', 'success')
                    return redirect('/edit_feed/' + feed_id)
        else:
            # Create a new feed
            existing_feed = [feed for feed in user.feeds if feed.link == form.link.data]
            if len(existing_feed) == 0:
                new_feed = models.Feed(title=form.title.data, link=form.link.data, \
                                        site_link=form.site_link.data, email=form.email_notification.data, \
                                        enabled=form.enabled.data)
                user.feeds.append(new_feed)
                user.feeds = sorted(user.feeds, key=lambda t: t.title.lower())
                user.save()
                flash('Feed "' + new_feed.title + '" successfully created.', 'success')
                return redirect('/edit_feed/' + str(new_feed.oid))
            else:
                flash('Feed "' + existing_feed[0].title + '" already in the database.', 'warning')
                return redirect('/edit_feed/' + str(existing_feed[0].oid))

    if request.method == 'GET':
        if feed_id != None:
            for feed in user.feeds:
                if str(feed.oid) == feed_id:
                    form = AddFeedForm(obj=feed)
                    return render_template('edit_feed.html', action="Edit the feed", form=form, feed=feed)

        # Return an empty form in order to create a new feed
        return render_template('edit_feed.html', action="Add a feed", form=form)

@app.route('/delete_feed/<feed_id>', methods=['GET'])
@login_required
def delete_feed(feed_id=None):
    user = models.User.objects(email=g.user.email).first()
    # delete all articles (Document objects) of the feed
    for feed in user.feeds:
        if str(feed.oid) == feed_id:
            for article in feed.articles:
                article.delete()
            feed.articles = []
            # delete the feed (EmbeddedDocument object)
            user.feeds.remove(feed)
            user.save()
            flash('Feed "' + feed.title + '" successfully deleted.', 'success')
    return redirect(url_for('home'))

@app.route('/profile/', methods=['GET', 'POST'])
@login_required
def profile():
    """
    Edit the profile of the user.
    """
    user = models.User.objects(email=g.user.email).first()
    form = ProfileForm()

    if request.method == 'POST':
        if form.validate() == False:
            return render_template('profile.html', form=form)

        form.populate_obj(user)
        if form.password.data != "":
            user.set_password(form.password.data)
        user.save()
        flash('User "' + user.firstname + '" successfully updated', 'success')
        return redirect('/profile/')

    if request.method == 'GET':
        form = ProfileForm(obj=user)
        return render_template('profile.html', form=form)