from flask import current_app
from flask_login import UserMixin
from itsdangerous import TimedJSONWebSignatureSerializer
from werkzeug.security import generate_password_hash, check_password_hash

from app import db, login_manager



@login_manager.user_loader
def load_user(user_id): return User.query.get(int(user_id))


class Role(db.Model):
    __tablename__ = 'roles'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(64), unique=True)
    users = db.relationship('User', backref='role', lazy='dynamic')

    def __repr__(self):
        return f'<Role {self.name!r}>'


class User(UserMixin, db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(64), unique=True, index=True)
    username = db.Column(db.String(64), unique=True, index=True)
    role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))
    password_hash = db.Column(db.String(128))
    confirmed = db.Column(db.Boolean, default=False)

    def __repr__(self): return f'<User {self.username!r}>'

    @property
    def password(self):
        raise AttributeError('password is not a readable attribute')

    @password.setter
    def password(self, password):
        self.password_hash = generate_password_hash(password, method='pbkdf2:sha256', salt_length=20)

    def verify_password(self, password):
        return check_password_hash(self.password_hash, password)

    def generate_confirmation_token(self, expiration=3600):
        s = TimedJSONWebSignatureSerializer(current_app, expiration)
        return s.dumps({'confirm': self.id}).decode('utf-8')

    def confirm(self, token):
        s = TimedJSONWebSignatureSerializer(current_app.config['SECRET_KEY'])

        try:
            data = s.loads(token.encode('utf-8'))
        except:
            return False

        if data.get('confirm') != self.id:
            return False

        self.confirmed = True
        db.session.add(self)
        db.session.commit()

        return True


class ComicMeta(db.Model):
    __tablename__ = 'comicmeta'
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(256), unique=True, index=True)
    issue = db.Column(db.Integer, nullable=True, index=True)
    category = db.Column(db.String(128), index=True, nullable=True)
    previous_issue = db.Column(db.String(256), nullable=True)
    next_issue = db.Column(db.String(256), nullable=True)
    cover_path = db.Column(db.String(256))
    archive_path = db.Column(db.String(256))