from flask import jsonify, render_template, abort, redirect, url_for, abort, flash, request, current_app, make_response, g
from flask_login import login_required, login_user, logout_user, current_user
from flask_sqlalchemy import get_debug_queries

from . import vmanager
from .forms import ActivateForm
from .. import db, csrf
from ..email import send_email
from ..models import User, Permission, Transaction, Order, Deployment, PubVLAN, Service, Region, Server, Address, Domain, SupportTopic, contact_proxmaster
from ..decorators import admin_required, permission_required

import json
import base64
import string
import random
from datetime import datetime, timedelta, date, time
from dateutil.relativedelta import relativedelta
import ast
import time

def randstr(n):
    return ''.join(random.SystemRandom().choice(string.ascii_lowercase + string.digits) for _ in range(n))

@vmanager.after_app_request
def after_request(response):
    for query in get_debug_queries():
        if query.duration >= current_app.config['SLOW_DB_QUERY_TIME']:
            current_app.logger.warning('Slow query: %s\nParameters: %s\nDuration: %fs\nContext: %s\n' % (query.statement, query.parameters, query.duration, query.context))
    return response

@vmanager.route('/slavetables', methods=['POST'])
@csrf.exempt
def slavetables():
    postdata = request.get_json()
    if postdata['passphrase'] == 'batkataisthebest1':
       selected_slave = Server.query.filter_by(name=str(postdata['slavename'])).first()
       if selected_slave == None:
           return jsonify({'status': 'slave_not_found'})
    addrlist = {}
    try:
        deploylist = selected_slave.inv_deployments.all()
        for deploy in deploylist:
            pubvlanlist = deploy.inv_pubvlans.all()
            for pubvlan in pubvlanlist:
               if pubvlan.pubaddr != None:
                   addrlist[str(pubvlan.pubaddr.ip)] = str(pubvlan.vlan_id)
        addrlist['status'] = 'ok'
    except:
        addrlist['status'] = 'tables_gen_error'
    return jsonify(addrlist)

@vmanager.route('/vmcreate/<int:orderid>', methods=['GET', 'POST'])
@login_required
@admin_required
def vmcreate(orderid):
    from flask_wtf import FlaskForm
    from wtforms import validators, RadioField, SubmitField
    from sqlalchemy.sql.expression import func, select

    order = Order.query.filter_by(pid=int(orderid)).first()
    if order == None:
        abort(403)

    servers = Server.query.filter_by(region_id=int(order.region_id)).all()
    serverchoices = []
    for server in servers:
        serverchoice = (str(server.pid), str(server.name))
        serverchoices.append(serverchoice)
    #TODO: check api for happiness and preselect suggested slave
    #happyslave = '2' #warrior in our case
    happyslave = '1'

    rand_pub_addr = Address.query.filter_by(region_id=int(order.region_id)).filter_by(reserved=False).filter_by(pubvlan_id=None).order_by(func.random()).first()
    if rand_pub_addr == None:
        flash('No free addresses in the selected region')
        return redirect(url_for('admin.list_addresses'))

    class SlaveForm(FlaskForm):
        slaveswitcher = RadioField('Select Slave Server', [validators.Required()], choices=serverchoices, default=happyslave)
        submit = SubmitField('Create')

    form = SlaveForm()
    if form.validate_on_submit():
        selectedslaveswitch = form.slaveswitcher.data
        selectedslave = Server.query.filter_by(pid=int(selectedslaveswitch)).first()
        data = { 'clientid': str(order.user_id),
                 'clientemail': str(order.owner.email),
                 'hostname': 'c' + str(order.user_id) + '-' + str(order.parameter1),
                 'slave': str(selectedslave.name),
                 'region': str(order.region.name),
                 'type': 'kvm',
                 'cpu': str(int(float(order.parameter2))),
                 'mem': str(int(float(order.parameter3))),
                 'hdd': str(int(float(order.parameter4))),
                 'net0if': 'vmbr7'
               }
        try:
            query = contact_proxmaster(data, 'create')
        except:
            flash('Region not available! Please try again later...') 
            return redirect(url_for('panel.dashboard'))
 
        if query['status'] == 'kvm_created':
            selected_slave = Server.query.filter_by(name=query['slave']).first()

            #create new topic                                     
            new_topic = SupportTopic(hashtag='deploy-' + str(query['unit_id']))
            db.session.add(new_topic)
            db.session.commit()

            deployment = Deployment(user_id=order.user_id, machine_alias=str(order.parameter1), period=1, machine_id=query['unit_id'], machine_cpu=data['cpu'], machine_mem=data['mem'], machine_hdd=data['hdd'], enabled=True, protected=False, daysleft=15, warning=True, discount=0, server_id=int(selected_slave.pid), topic_id=int(new_topic.pid))
            db.session.add(deployment)
            db.session.commit()

            new_vlan = PubVLAN(deploy_id=int(deployment.pid), vlan_id=int(query['vlanid']))
            db.session.add(new_vlan)
            db.session.commit()

            rand_pub_addr.pubvlan_id = new_vlan.pid
            rand_pub_addr.user_id = order.user_id
            db.session.commit()

            order.status = 'accepted'
            db.session.commit()
            flash('A new deployment is created successfully in region "{}".'.format(str(order.region.description)))
            return redirect(url_for('panel.dashboard'))
        else:
            flash('Deployment could not be created! Please try again later...') 

        return redirect(url_for('panel.dashboard'))
    return render_template('vmanager/create.html', form=form, order=order)

@vmanager.route('/vmremove/<int:unit_id>', methods=['GET', 'POST'])
@login_required
@admin_required
def remove(unit_id=0):
    data = { 'unit_id': int(unit_id),
             'type': 'kvm' }
    deploy = Deployment.query.filter_by(machine_id=int(unit_id)).first()
    if current_user.is_administrator():
        if deploy.protected is not True:
            try:
                query = contact_proxmaster(data, 'status')
                if query['status'] == 'UNREACHABLE':
                    flash('Physical machine is not reachable. Cannot be deleted from the database')
                    return redirect(url_for('admin.list_archive'))

                if query['status'] == 'running':
                    query = contact_proxmaster(data, 'stop')
                    flash('Machine {} force stopped'.format(unit_id))
                    time.sleep(7)

                #pubvlans depends on deploy as foreign key so delete them first
                for pubvlan in deploy.inv_pubvlans:
                    #clean public addr assignment
                    if pubvlan.pubaddr != None:
                        pubvlan.pubaddr.pubvlan_id = None
                        pubvlan.pubaddr.user_id = None
                        db.session.commit()
                    db.session.delete(pubvlan)
                    db.session.commit()

                query = contact_proxmaster(data, 'remove')
                flash('Machine {} terminated'.format(unit_id))
                deploy.deleted = True
                deploy.enabled = False
                deploy.warning = False
                db.session.commit()

            except Exception as e:
                current_app.logger.error(e)
                flash('Cannot delete machine {}'.format(unit_id))
            return redirect(url_for('admin.list_archive'))
        else:
            current_app.logger.warning('Deployment id:{} is protected! Cannot be removed'.format(unit_id))
    else:
        current_app.logger.warning('[WARNING] Unauthorized attempt to remove Deployment id:{}'.format(unit_id))
    abort(404)

@vmanager.route('/activate/<int:itemid>', methods=['GET', 'POST'])
@login_required
def activate(itemid=0):
    result = current_user.inv_deployments.filter_by(deleted=False).all()
    inventory = []
    for invcls in result:
        inventory.extend([invcls.machine_id])
    if current_user.is_administrator():
        current_app.logger.warning('[ADMIN] Access override for deployment id:{}'.format(itemid))
    elif not itemid in inventory:
        current_app.logger.error('[{}] Access violation with deployment id: {}'.format(current_user.email, itemid))
        abort(403)

    deploy = Deployment.query.filter_by(machine_id=itemid).first()
    if deploy is None:
        abort(404)
    if deploy.enabled == True and deploy.warning == False:
        abort(403)
    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']
    tpm = cpu_cost + mem_cost + hdd_cost
    discount = round(( tpm * deploy.discount ) / 100)
    ppm = round(tpm - discount)

    #default period = 1 for virgin deployments
    if deploy.period is None:
        form = ActivateForm(period=1)
        total = ppm * 1
    else:
        form = ActivateForm(period=int(deploy.period))
        total = ppm * deploy.period

    owner = deploy.owner
    if owner.confirmed and form.validate_on_submit():
        total = ppm * form.period.data
        if owner.wallet < total:
            flash('Activation costs {} {}. Insufficient Funds'.format(total, owner.currency), 'danger')
            if current_user.is_administrator():
                return redirect(url_for('admin.list_users'))
            else:
                return redirect(url_for('uinvoice.transactions'))
        current_app.logger.info('[{}] Charge deployment: {}'.format(owner.email, deploy.machine_id))
        today = datetime.utcnow()
        expiry = today + relativedelta(today, months=+(form.period.data))
        daysleft = expiry - today
        extradays = relativedelta(today, days=+(deploy.daysleft))
        deploy.date_last_charge = today + extradays
        deploy.period = form.period.data
        deploy.daysleft = daysleft.days + extradays.days 
        deploy.warning = False
        deploy.enabled = True
        deploy.protected = True
        db.session.commit()        

        email_content = 'Deployment {} is activated for {} month(s). It will expire at {}'.format(str(deploy.machine_alias), form.period.data, str((expiry + extradays).strftime('%c')))
        send_email(current_app.config['MAIL_USERNAME'], str(email_content), 'email/adm_logger', user=owner, content=str(email_content))
        send_email(str(owner.email), str(email_content), 'email/client_logger', content=str(email_content))

        transaction = Transaction(user_id=int(owner.pid), description=str(email_content), value=-total)
        db.session.add(transaction)
        db.session.commit()
        owner.wallet = owner.wallet - total
        db.session.commit()
        flash('Deployment {} activated for {} month(s)'.format(str(deploy.machine_alias), form.period.data))
        if current_user.is_administrator():
            return redirect(url_for('admin.list_deployments'))
        else:
            return redirect(url_for('panel.dashboard'))
    return render_template('vmanager/activate.html', form=form, deploy=deploy, cpu_cost=cpu_cost, mem_cost=mem_cost, hdd_cost=hdd_cost, tpm=tpm, ppm=ppm, discount=discount, total=total, currency=owner.currency)

@vmanager.route('/command/<cmd>/<int:unit_id>')
@login_required
def command(cmd=None, unit_id=0):
    #checks whether this is a valid command
    valid_commands = ['status', 'start', 'shutdown', 'stop', 'vmvnc']
    if not cmd in valid_commands:
        current_app.logger.warning(cmd + ' is not a valid command!')
        abort(404)

    #work with enabled deploys only that you own.
    result = current_user.inv_deployments.filter_by(enabled=True)
    inventory = []
    for invcls in result:
        inventory.extend([invcls.machine_id])

    data = { 'type': 'kvm',
             'unit_id': int(unit_id) }

    if current_user.is_administrator():
        #current_app.logger.warning('[ADMIN] Access override for cube id:{}'.format(unitunit__id)) 
        db_result = contact_proxmaster(data, cmd)
        if cmd == 'vmvnc':
            return redirect(db_result['url'])
    else:
        #checks if current user owns this unit_id
        if not unit_id in inventory:
            current_app.logger.warning('[{}] Access violation with unit id: {}'.format(current_user.email, unit_id))
            #TODO: log ips
        else:
            db_result = contact_proxmaster(data, cmd)
            #print(db_result)
            if cmd == 'vmvnc':
                return redirect(db_result['url'])
    abort(404)