from werkzeug.security import generate_password_hash, check_password_hash
from flask_login import UserMixin, AnonymousUserMixin
from . import login_manager, db
from itsdangerous import TimedJSONWebSignatureSerializer as Serializer
from flask import current_app
from datetime import datetime


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


class User_Module(db.Model):
    __tablename__ = 'user_modules'
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), primary_key=True)
    module_id = db.Column(db.Integer, db.ForeignKey('modules.id'), primary_key=True)
    grade = db.Column(db.Integer, default=0)


class Module(db.Model):
    __tablename__ = 'modules'
    id = db.Column(db.Integer, primary_key=True)
    module_code = db.Column(db.String(20),index=True)
    exam_date = db.Column(db.Date)
    title = db.Column(db.String(20), index=True)
    staff = db.Column(db.String(20), index=True)
    user = db.relationship('User_Module',
                           foreign_keys=[User_Module.module_id],
                           backref=db.backref('module', lazy='joined'),
                           lazy='dynamic',
                           cascade='all, delete-orphan')


class User(UserMixin, db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(20), index=True)
    gender = db.Column(db.String(10), index=True)
    student_id = db.Column(db.String(10), index=True)
    phone_number = db.Column(db.String(11), index=True)
    department = db.Column(db.String(30), index=True)
    email = db.Column(db.String(30), index=True)
    password_hash = db.Column(db.String(60))
    confirmed = db.Column(db.Boolean, default=False)
    member_since = db.Column(db.DateTime(), default=datetime.utcnow)
    last_seen = db.Column(db.DateTime(), default=datetime.utcnow)
    role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))
    module = db.relationship('User_Module',
                             foreign_keys=[User_Module.user_id],
                             backref=db.backref('user', lazy='joined'),
                             lazy='dynamic',
                             cascade='all, delete-orphan')

    def __init__(self, **kwargs):
        super(User, self).__init__(**kwargs)
        if self.role is None:
            if self.email == '978633302@qq.com':
                self.role = Role.query.filter_by(name='Administrator').first()
            if self.role is None:
                self.role = Role.query.filter_by(default=True).first()

    @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)

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

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

    def confirm(self, token):
        s = Serializer(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)
        return True

    def generate_reset_token(self, expiration=3600):
        s = Serializer(current_app.config['SECRET_KEY'], expiration)
        return s.dumps({'reset': self.id}).decode('utf-8')

    @staticmethod
    def reset_password(token, new_password):
        s = Serializer(current_app.config['SECRET_KEY'])
        try:
            data = s.loads(token.encode('utf-8'))
        except:
            return False
        user = User.query.get(data.get('reset'))
        if user is None:
            return False
        user.password = new_password
        db.session.add(user)
        return True

    def generate_email_change_token(self, new_email, expiration=3600):
        s = Serializer(current_app.config['SECRET_KEY'], expiration)
        return s.dumps(
            {'change_email': self.id, 'new_email': new_email}).decode('utf-8')

    def change_email(self, token):
        s = Serializer(current_app.config['SECRET_KEY'])
        try:
            data = s.loads(token.encode('utf-8'))
        except:
            return False
        if data.get('change_email') != self.id:
            return False
        new_email = data.get('new_email')
        if new_email is None:
            return False
        if self.query.filter_by(email=new_email).first() is not None:
            return False
        self.email = new_email
        db.session.add(self)
        return True

    def can(self, perm):
        return self.role is not None and self.role.has_permission(perm)

    def is_administrator(self):
        if self.email == '978633302@qq.com':
            return 1
        else:
            return 0

    def ping(self):
        self.last_seen = datetime.utcnow()
        db.session.add(self)

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


class Role(db.Model):
    __tablename__ = 'roles'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(20), unique=True)
    default = db.Column(db.Boolean, default=False, index=True)
    permissions = db.Column(db.Integer)
    users = db.relationship('User', backref='role', lazy='dynamic')

    def __init__(self, **kwargs):
        super(Role, self).__init__(**kwargs)
        if self.permissions is None:
            self.permissions = 0

    def add_permission(self, perm):
        if not self.has_permission(perm):
            self.permissions += perm

    def remove_permission(self, perm):
        if self.has_permission(perm):
            self.permissions -= perm

    def reset_permissions(self):
        self.permissions = 0

    def has_permission(self, perm):
        return self.permissions & perm == perm

    @staticmethod
    def insert_roles():
        roles = {
            'User': [Permission.QUERY],
            'Administrator': [Permission.QUERY, Permission.ADMIN],
        }

        default_role = 'User'
        for r in roles:
            role = Role.query.filter_by(name=r).first()
            if role is None:
                role = Role(name=r)
            role.reset_permissions()
            for perm in roles[r]:
                role.add_permission(perm)
            role.default = (role.name == default_role)
            db.session.add(role)
        db.session.commit()

    def __repr__(self):
        return '<Role %r>' % self.name


class Permission:
    QUERY = 1
    ADMIN = 8


class AnonymousUser(AnonymousUserMixin):
    def can(self, permissions):
        return False

    def is_administrator(self):
        return False


login_manager.anonymous_user = AnonymousUser


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