import hashlib
from werkzeug.security import generate_password_hash, check_password_hash
from itsdangerous import TimedJSONWebSignatureSerializer as Serializer

from flask import current_app, request, url_for
from flask_login import UserMixin, AnonymousUserMixin
from proxadmin.exceptions import ValidationError
from . import db, lm

import os
import base64
import json
import requests
import onetimepass
from datetime import date, datetime, time, timedelta
from sortedcontainers import SortedDict


class Permission:
    DEPLOY = 0x01
    ADMINISTER = 0x80


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

    @staticmethod
    def insert_roles():
        roles = {
        'User': (Permission.DEPLOY, True),
        'Administrator': (0xff, False)
    }
        for r in roles:
            role = Role.query.filter_by(name=r).first()
            if role is None:
                role = Role(name=r)
            role.permissions = roles[r][0]
            role.default = roles[r][1]
            db.session.add(role)
        db.session.commit()

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


class User(db.Model, UserMixin):
    __tablename__ = 'users'

    pid = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(64), unique=True, index=True)
    role_id = db.Column(db.Integer, db.ForeignKey('roles.pid')) #FK
    password_hash = db.Column(db.String(128))

    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)
    last_ip = db.Column(db.String(128))
    twofactor = db.Column(db.Boolean, default=False) #optional 2factor auth
    otp_secret = db.Column(db.String(16))
    avatar_hash = db.Column(db.String(32))

    name = db.Column(db.Unicode(256))
    address = db.Column(db.Unicode(256))
    city = db.Column(db.Unicode(64))
    postcode = db.Column(db.String(10))
    country = db.Column(db.String(64))
    phone = db.Column(db.String(64))
    org_responsible = db.Column(db.Unicode(128))
    org_bulstat = db.Column(db.String(16))

    inv_deployments = db.relationship('Deployment', backref='owner', lazy='dynamic')
    inv_contracts = db.relationship('Contract', backref='owner', lazy='dynamic')
    inv_domains = db.relationship('Domain', backref='owner', lazy='dynamic')

    currency = db.Column(db.String(3), default='BGN')

    def __init__(self, **kwargs):
        super(User, self).__init__(**kwargs)
        if self.role is None:
            if self.email == current_app.config['ADMIN_EMAIL']:
                #if email match config admin name create admin user
                self.role = Role.query.filter_by(permissions=0xff).first()
            if self.role is None:
                #if role is stil not set, create default user role
                self.role = Role.query.filter_by(default=True).first()

        if self.email is not None and self.avatar_hash is None:
            self.avatar_hash = hashlib.md5(self.email.encode('utf-8')).hexdigest()

        if self.otp_secret is None:
            # generate a random secret
            self.otp_secret = base64.b32encode(os.urandom(10)).decode('utf-8')

    @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 get_totp_uri(self):
        return 'otpauth://totp/DataPanel:{0}?secret={1}&issuer=datapanel'.format(self.email, self.otp_secret)

    def verify_totp(self, token):
        return onetimepass.valid_totp(token, self.otp_secret)

    def generate_confirmation_token(self, expiration=86400):
        s = Serializer(current_app.config['SECRET_KEY'], expiration)
        return s.dumps({'confirm': self.pid})

    def confirm(self, token):
        s = Serializer(current_app.config['SECRET_KEY'])
        try:
            data = s.loads(token)
        except:
            return False
        if data.get('confirm') != self.pid:
            return False
        self.confirmed = True
        db.session.add(self)
        db.session.commit()
        return True

    def generate_reset_token(self, expiration=86400):
        s = Serializer(current_app.config['SECRET_KEY'], expiration)
        return s.dumps({'reset': self.pid})

    def reset_password(self, token, new_password):
        s = Serializer(current_app.config['SECRET_KEY'])
        try:
            data = s.loads(token)
        except:
            return False
        if data.get('reset') != self.pid:
            return False
        self.password = new_password
        db.session.add(self)
        db.session.commit()
        return True

    def can(self, permissions):
        return self.role is not None and (self.role.permissions & permissions) == permissions

    def is_administrator(self):
        return self.can(Permission.ADMINISTER)

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

    def gravatar(self, size=100, default='identicon', rating='g'):
        #this check is disabled because it didnt work for me but forcing https to gravatar is okay.
        #if request.is_secure:
        #    url = 'https://secure.gravatar.com/avatar'
        #else:
        #    url = 'http://www.gravatar.com/avatar'
        url = 'https://secure.gravatar.com/avatar'
        hash = self.avatar_hash or hashlib.md5(self.email.encode('utf-8')).hexdigest()
        return '{url}/{hash}?s={size}&d={default}&r={rating}'.format(url=url, hash=hash, size=size, default=default, rating=rating)

    def is_authenticated(self):
        return self.is_authenticated

    def get_id(self):
        return str(self.pid)

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


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

    def is_administrator(self):
        return False

lm.anonymous_user = AnonymousUser


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


def contact_proxmaster(data, method, cubeid=0):
    url = current_app.config['PROXMASTER_URL']
    data['apikey'] = current_app.config['APIKEY']
    data_json = json.dumps(data)
    #print('--> {}'.format(data))

    if method == 'vmcreate':
        url = '{}/{}'.format(url, method)
    else:
        url = '{}/{}/{}'.format(url, method, cubeid)

    db_result = requests.post( url, data=data_json, headers={"content-type": "application/json"}, timeout=30 )

    try:
        proxjson = db_result.json()
        #print('proxmaster query {}'.format(str(proxjson)))
        return proxjson
    except:
        return None


#TEMPLATE CLASSES
class Product(db.Model):
    __tablename__ = 'products'
    pid = db.Column(db.Integer, primary_key=True) #PK
    group = db.Column(db.Integer)
    name = db.Column(db.String(64))
    image = db.Column(db.String(128))
    description = db.Column(db.String(128))
    cpu = db.Column(db.Integer) #default cpu
    mem = db.Column(db.Integer) #default mem
    hdd = db.Column(db.Integer) #default hdd
    recipe = db.Column(db.String(128)) #defaut template name
    enabled = db.Column(db.Boolean)

    @staticmethod
    def insert_products():
        products = current_app.config['PRODUCTS']
        for p in products:
            product = Product.query.filter_by(pid=p).first()
            if product is None:
                product = Product(name=p)

            #insert default values
            product.group = products[p][0]
            product.name = products[p][1]
            product.image = products[p][2]
            product.description = products[p][3]
            product.cpu = products[p][4]
            product.mem = products[p][5]
            product.hdd = products[p][6]
            product.recipe = products[p][7]
            product.enabled = products[p][8]
            db.session.add(product)
        db.session.commit()

    @staticmethod
    def get_products():
        result = Product.query.all()
        products = {}
        for product in result:
            if product.enabled == True:
                products[int(product.pid)] = { 'group': product.group,
                                               'img': '/static/images/' + product.image, 
                                               'name': product.name, 
                                               'description': product.description, 
                                               'cpu': product.cpu,
                                               'mem': product.mem,
                                               'hdd': product.hdd,
                                               'recipe': product.recipe,
                                             }
        return products

class Service(db.Model):
    __tablename__ = 'services'
    pid = db.Column(db.Integer, primary_key=True) #PK
    name = db.Column(db.String(64))
    image = db.Column(db.String(128))
    description = db.Column(db.String(128))
    unitprice = db.Column(db.Float)
    enabled = db.Column(db.Boolean)

    @staticmethod
    def insert_services():
        services = current_app.config['SERVICES']
        for s in services:
            service = Service.query.filter_by(pid=p).first()
            if service is None:
                service = Service(name=s)

            #insert default values
            service.name = products[p][1]
            service.image = products[p][2]
            service.description = products[p][3]
            service.unitprice = products[p][4]
            service.enabled = products[p][5]
            db.session.add(service)
        db.session.commit()

    @staticmethod
    def get_services():
        result = Service.query.all()
        services = {}
        for service in result:
            if service.enabled == True:
                services[int(service.pid)] = {'img': '/static/images/' + service.image, 
                                              'name': service.name, 
                                              'description': service.description, 
                                              'unitprice': service.unitprice
                                             }
        return services

class Order(db.Model):
    __tablename__ = 'orders'
    pid = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.pid')) #FK
    date_created = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    units = db.Column(db.Integer, default=1)
    unitvalue = db.Column(db.Float)
    currency = db.Column(db.String, default='BGN')
    paid = db.Column(db.Boolean, default=False)

#class Invoice(db.Model)

#INVENTORY CLASSES
class Deployment(db.Model):
    __tablename__ = 'deployments'
    pid = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.pid')) #FK
    product_id = db.Column(db.Integer, db.ForeignKey('products.pid')) #FK
    date_created = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    date_expire = db.Column(db.DateTime)
    enabled = db.Column(db.Boolean)

    machine_id = db.Column(db.BigInteger) #cubeid
    machine_alias = db.Column(db.String) #dns name for easy managing
    machine_cpu = db.Column(db.Integer)
    machine_mem = db.Column(db.Integer)
    machine_hdd = db.Column(db.Integer)
    credit = db.Column(db.Float)

    def charge():
        result = Deployment.query.all()
        for deploy in result:
            managed_user = User.query.get(deploy.user_id)
            db.session.add(deploy)
            if datetime.utcnow.date() > (deploy.date_expire - timedelta(days=10)):
                if deploy.credit > 0:
                    print('{} Deployment {} will expire in 10 days at {}. Creating new order...'.format(managed_user.email, deploy.machine_alias, deploy.date_expire))
                    current_product = Product.query.get(int(deploy.product_id))
                    order = Order(user_id=managed_user.pid, unitvalue=deploy.credit, description='Cloud server {} - {}'.format(current_product.name, deploy.machine_alias))
                    db.session.add(order)
                    deploy.credit = 0
                    deploy.data_expire = datetime.utcnow.date() + timedelta(days=30)
            else:
                cpu_cost = deploy.machine_cpu * current_app.config['CPU_RATIO']
                mem_cost = ( deploy.machine_mem / 1024 ) * current_app.config['MEM_RATIO']
                hdd_cost = deploy.machine_hdd * current_app.config['HDD_RATIO']
                total = cpu_cost + mem_cost + hdd_cost
                if deploy.enabled == True:
                    print('{}> Charging deployment #{} with {} ({} monthly)'.format(managed_user.email, deploy.pid, total))
                    deploy.credit += total
            db.session.commit()
        return True

class Contract(db.Model):
    __tablename__ = 'contracts'
    pid = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.pid')) #FK
    service_id = db.Column(db.Integer, db.ForeignKey('services.pid')) #FK
    date_created = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    date_expire = db.Column(db.DateTime)
    enabled = db.Column(db.Boolean)

    description = db.Column(db.String)
    units = db.Column(db.Integer)
    discount = db.Column(db.Integer) #percent
    credit = db.Column(db.Float)

    def charge():
        result = Contract.query.all()
        for contract in result:
            managed_user = User.query.get(contract.user_id)
            db.session.add(contract)
            if datetime.utcnow.date() > (contract.date_expire - timedelta(days=10)):
                if contract.enabled == True:
                    print('{}> Contract {} will expire in 10 days at {}. Creating new order...'.format(managed_user.email, contract.pid, contract.date_expire))
                    current_service = Service.query.get(int(contract.product_id))
                    order = Order(user_id=managed_user.id, units=contract.units, unitvalue=(current_service.unitprice * contract.units), description=current_service.name)
                    db.session.add(order)
                    contract.data_expire = datetime.utcnow.date() + timedelta(days=30)
            db.session.commit()
        return True

class Domain(db.Model):
    __tablename__ = 'domains'
    pid = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.pid')) #FK
    date_created = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    date_expire = db.Column(db.DateTime)
    enabled = db.Column(db.Boolean)

    fqdn = db.Column(db.String, unique=True)
    auto_update = db.Column(db.Boolean)
    credit = db.Column(db.Float)

    def charge():
        result = Domain.query.all()
        for domain in result:
            managed_user = User.query.get(domain.user_id)
            db.session.add(domain)
            if datetime.utcnow.date() > (domain.date_expire - timedelta(days=60)):
                if domain.enabled == True:
                    print('{}> Domain {} will expire in 60 days at {}. Creating new order...'.format(managed_user.email, domain.fqdn, domain.date_expire))
                    order = Order(user_id=managed_user.id, unitvalue=25, description=domain.fqdn)
                    db.session.add(order)
            db.session.commit() 
        return True