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

# pyAggr3g470r - A Web based news aggregator.
# Copyright (C) 2010-2015  Cédric Bonhomme - https://www.cedricbonhomme.org
#
# For more information : https://bitbucket.org/cedricbonhomme/pyaggr3g470r/
#
# 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: 0.4 $"
__date__ = "$Date: 2013/11/05 $"
__revision__ = "$Date: 2014/04/12 $"
__copyright__ = "Copyright (c) Cedric Bonhomme"
__license__ = "GPLv3"

import re
import json
import random
import hashlib
from datetime import datetime
from flask import g
from sqlalchemy import asc, desc
from werkzeug import generate_password_hash, check_password_hash
from flask.ext.login import UserMixin

db = g.db


class User(db.Model, UserMixin):
    """
    Represent a user.
    """
    id = db.Column(db.Integer, primary_key=True)
    nickname = db.Column(db.String(), unique=True)
    email = db.Column(db.String(254), index=True, unique=True)
    pwdhash = db.Column(db.String())
    roles = db.relationship('Role', backref='user', lazy='dynamic')
    activation_key = db.Column(db.String(128), default=hashlib.sha512(
            str(random.getrandbits(256)).encode("utf-8")).hexdigest()[:86])
    date_created = db.Column(db.DateTime(), default=datetime.now)
    last_seen = db.Column(db.DateTime(), default=datetime.now)
    feeds = db.relationship('Feed', backref='subscriber', lazy='dynamic',
                            cascade='all,delete-orphan')
    refresh_rate = db.Column(db.Integer, default=60)  # in minutes

    @staticmethod
    def make_valid_nickname(nickname):
        return re.sub('[^a-zA-Z0-9_\.]', '', nickname)

    def get_id(self):
        """
        Return the id (email) of the user.
        """
        return self.email

    def set_password(self, password):
        """
        Hash the password of the user.
        """
        self.pwdhash = generate_password_hash(password)

    def check_password(self, password):
        """
        Check the password of the user.
        """
        return check_password_hash(self.pwdhash, password)

    def is_admin(self):
        """
        Return True if the user has administrator rights.
        """
        return len([role for role in self.roles if role.name == "admin"]) != 0

    def __eq__(self, other):
        return self.id == other.id

    def __repr__(self):
        return '<User %r>' % (self.nickname)


class Role(db.Model):
    """
    Represent a role.
    """
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(), unique=True)

    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))


class Feed(db.Model):
    """
    Represent a station.
    """
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(), default="No title")
    description = db.Column(db.String(), default="FR")
    link = db.Column(db.String())
    site_link = db.Column(db.String(), default="")
    email_notification = db.Column(db.Boolean(), default=False)
    enabled = db.Column(db.Boolean(), default=True)
    created_date = db.Column(db.DateTime(), default=datetime.now)

    # cache handling
    etag = db.Column(db.String(), default="")
    last_modified = db.Column(db.DateTime(), default=datetime(1970, 1, 1))

    # error logging
    last_error = db.Column(db.String(), default="")
    error_count = db.Column(db.Integer(), default=0)

    # relationship
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    articles = db.relationship('Article', backref='source', lazy='dynamic',
                               cascade='all,delete-orphan',
                               order_by=desc("Article.date"))

    def __repr__(self):
        return '<Feed %r>' % (self.title)

    def dump(self):
        return {"id": self.id,
                "title": self.title,
                "description": self.description,
                "link": self.link,
                "site_link": self.site_link,
                "etag": self.etag,
                "last_modified": self.last_modified}


class Article(db.Model):
    """
    Represent an article from a feed.
    """
    id = db.Column(db.Integer, primary_key=True)
    entry_id = db.Column(db.String())
    link = db.Column(db.String())
    title = db.Column(db.String())
    content = db.Column(db.String())
    readed = db.Column(db.Boolean(), default=False)
    like = db.Column(db.Boolean(), default=False)
    date = db.Column(db.DateTime(), default=datetime.now)
    retrieved_date = db.Column(db.DateTime(), default=datetime.now)
    guid = db.Column(db.String(), default="")

    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    feed_id = db.Column(db.Integer, db.ForeignKey('feed.id'))

    def previous_article(self):
        """
        Returns the previous article (older).
        """
        return Article.query.filter(Article.date < self.date,
                                    Article.feed_id == self.feed_id)\
                            .order_by(desc("Article.date")).first()

    def next_article(self):
        """
        Returns the next article (newer).
        """
        return Article.query.filter(Article.date > self.date,
                                    Article.feed_id == self.feed_id)\
                            .order_by(asc("Article.date")).first()

    def __repr__(self):
        return json.dumps({
                            "title": self.title,
                            "link": self.link,
                            "content": self.content
                         })

    def dump(self):
        return {"id": self.id,
                "title": self.title,
                "link": self.link,
                "content": self.content,
                "readed": self.readed,
                "like": self.like,
                "date": self.date,
                "retrieved_date": self.retrieved_date,
                "feed_id": self.source.id,
                "feed_name": self.source.title}