import os
import json
import requests
import time
from datetime import datetime
import base64

try:
    from polymorphic.models import PolymorphicModel
except:
    from polymorphic import PolymorphicModel

from django.template.base import kwarg_re
from django.db import models
from django.urls import reverse
from django.core.validators import MinValueValidator, MaxValueValidator
from django.shortcuts import get_object_or_404
from django.contrib.auth.models import User
from django.db.models.signals import post_save
from django.dispatch import receiver

from apps.main.utils import Params

DEV_PORTS = {
                'pedestal'      : 80,
                'pedestal_dev'  : 80,
                'generator'     : 80,
                'usrp_rx'       : 2000,
                'usrp_tx'       : 2000,
            }

RADAR_STATES = (
                 (0, 'No connected'),
                 (1, 'Connected'),
                 (2, 'Configured'),
                 (3, 'Running'),
                 (4, 'Scheduled'),
             )

EXPERIMENT_TYPE = (
                   (0, 'RAW_DATA'),
                   (1, 'PDATA'),
                   )

DECODE_TYPE = (
             (0, 'None'),
             (1, 'TimeDomain'),
             (2, 'FreqDomain'),
             (3, 'InvFreqDomain'),
             )

DEV_STATES = (
                 (0, 'Unknown'),
                 (1, 'Connected'),
                 (2, 'Configured'),
                 (3, 'Running'),
                 (4, 'Offline'),
             )

DEV_TYPES = (
                ('', 'Select a  device type'),
                ('pedestal', 'Pedestal Controller'),
                ('pedestal_dev', 'Pedestal Controller Dev Mode'),
                ('generator', 'Pulse Generator'),
                ('usrp_rx', 'Universal Software Radio Peripheral Rx'),
                ('usrp_tx', 'Universal Software Radio Peripheral Tx'),
            )

EXP_STATES = (
                 (0,'Error'),                 #RED
                 (1,'Cancelled'),             #YELLOW
                 (2,'Running'),               #GREEN
                 (3,'Scheduled'),             #BLUE
                 (4,'Unknown'),               #WHITE
                 (5,'Other'),                 #ORANGE
             )

CONF_TYPES = (
                 (0, 'Active'),
                 (1, 'Historical'),
             )

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    theme = models.CharField(max_length=30, default='spacelab')


@receiver(post_save, sender=User)
def create_user_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)

@receiver(post_save, sender=User)
def save_user_profile(sender, instance, **kwargs):
    instance.profile.save()


class DeviceType(models.Model):

    name = models.CharField(max_length = 15, choices = DEV_TYPES, default = 'pedestal')
    sequence = models.PositiveSmallIntegerField(default=55)
    description = models.TextField(blank=True, null=True)

    class Meta:
        db_table = 'db_device_types'

    def __str__(self):
        return u'%s' % self.name.title()

class Device(models.Model):

    device_type  = models.ForeignKey('DeviceType', on_delete=models.CASCADE)
    ip_address   = models.GenericIPAddressField(verbose_name = 'IP address', protocol='IPv4', default='0.0.0.0')
    port_address = models.PositiveSmallIntegerField(default=2000)
    description  = models.TextField(blank=True, null=True)
    status       = models.PositiveSmallIntegerField(default=4, choices=DEV_STATES)
    conf_active  = models.PositiveIntegerField(default=0, verbose_name='Current configuration')

    class Meta:
        db_table = 'db_devices'

    def __str__(self):
        ret = self.device_type
        return str(ret)

    @property
    def name(self):
        return str(self)

    def get_status(self):
        return self.status

    @property
    def status_color(self):
        color = 'muted'
        if self.status == 0:
            color = "danger"
        elif self.status == 1:
            color = "primary"
        elif self.status == 2:
            color = "info"
        elif self.status == 3:
            color = "success"

        return color

    def url(self, path=None):

        if path:
            return 'http://{}:{}/{}/'.format(self.ip_address, self.port_address, path)
        else:
            return 'http://{}:{}/'.format(self.ip_address, self.port_address)

    def get_absolute_url(self):
        return reverse('url_device', args=[str(self.id)])

    def get_absolute_url_edit(self):
        return reverse('url_edit_device', args=[str(self.id)])

    def get_absolute_url_delete(self):
        return reverse('url_delete_device', args=[str(self.id)])

    def change_ip(self, ip_address, mask, gateway, dns, **kwargs):

        if self.device_type.name=='pedestal':
            headers = {'content-type': "application/json",
                       'cache-control': "no-cache"}

            ip      = [int(x) for x in ip_address.split('.')]
            dns     = [int(x) for x in dns.split('.')]
            gateway = [int(x) for x in gateway.split('.')]
            subnet  = [int(x) for x in mask.split('.')]

            payload = {
                "ip": ip,
                "dns": dns,
                "gateway": gateway,
                "subnet": subnet
                }

            req = requests.post(self.url('changeip'), data=json.dumps(payload), headers=headers)
            try:
                answer = req.json()
                if answer['changeip']=='ok':
                    self.message    = '25|IP succesfully changed'
                    self.ip_address = ip_address
                    self.save()
                else:
                    self.message = '30|An error ocuur when changing IP'
            except Exception as e:
                self.message = '40|{}'.format(str(e))
        else:
            self.message = 'Not implemented'
            return False

        return True


class Experiment(PolymorphicModel):
    
    name       = models.CharField(max_length=40, default='', unique=True)
    pedestal   = models.ForeignKey('pedestal.PedestalConfiguration', null=False, blank=False, on_delete=models.PROTECT, default=None, limit_choices_to={'type': 0}, related_name = "pedestal_conf")
    generator = models.ForeignKey('Device', null=False, blank=False, on_delete=models.PROTECT, default=2, editable=False, limit_choices_to={'device_type__name': 'generator'}, related_name = "generator_conf")
    reception_rx    = models.ForeignKey('usrp_rx.USRPRXConfiguration', null=False, blank=False, on_delete=models.PROTECT, default=None, limit_choices_to={'type': 0}, related_name = "usrp_rx_CONF")
    transmission_tx = models.ForeignKey('usrp_tx.USRPTXConfiguration', null=False, blank=False, on_delete=models.PROTECT, default=None, limit_choices_to={'type': 0}, related_name = "usrp_tx")
    task       = models.CharField(max_length=36, default='', blank=True, null=True)
    status     = models.PositiveSmallIntegerField(default=4, choices=EXP_STATES)
    author     = models.ForeignKey(User, null=True, blank=True, on_delete=models.CASCADE)
    hash       = models.CharField(default='', max_length=64, null=True, blank=True)
    latitude = models.FloatField(null=False, blank=False, default=0, editable=False)
    longitude = models.FloatField(null=False, blank=False, default=0, editable=False)
    altitude = models.FloatField(null=False, blank=False, default=0, editable=False)
    heading = models.FloatField(null=True, blank=True)
    mode_stop = models.CharField(max_length=3, null=False, blank=False, default='web', editable=False)

    class Meta:
        db_table = 'db_experiments'
        ordering = ('name',)

    def __str__(self):
        return u'%s' % (self.name)

    def jsonify(self):

        data = {}

        ignored = []

        for field in self._meta.fields:
            if field.name in ignored:
                continue
            data[field.name] = field.value_from_object(self)
        
        data['configurations'] = ['{}'.format(conf.pk) for
            conf in Configuration.objects.filter(experiment=self, type=0)]

        return data

    def clone(self, **kwargs):

        confs = Configuration.objects.filter(experiment=self, type=0)
        self.pk = None
        self.name = '{}_{:%y%m%d}'.format(self.name, datetime.now())
        for attr, value in kwargs.items():
            setattr(self, attr, value)

        self.save()

        for conf in confs:
            conf.clone(experiment=self)

        return self


    def generator_start(self):
        try:
            experiment = get_object_or_404(Experiment, pk=self.id)
            generator_url = experiment.generator.url()

            period = self.transmission_tx.ipp*2/0.3
            if self.transmission_tx.enable_2:
                payload = {"Delay": 1 + self.transmission_tx.delay, "periode1": period, "width1": self.transmission_tx.pulse_1 + 6, "repeatability1": self.transmission_tx.repetitions_1, "periode2": period, "width2": self.transmission_tx.pulse_2 + 6, "repeatability2": self.transmission_tx.repetitions_2, "enable": 1}
            else:
                payload = {"Delay": 1 + self.transmission_tx.delay, "periode1": period, "width1": self.transmission_tx.pulse_1 + 6, "repeatability1": 1, "periode2": period, "width2": self.transmission_tx.pulse_1 + 6, "repeatability2": 1, "enable": 1}
            
            json_trmode = json.dumps(payload)
            
            base64_trmode = base64.standard_b64encode(json_trmode.encode('ascii'))
            
            trmode_url = generator_url + "trmode?params="
            complete_url_trmode = trmode_url + base64_trmode.decode('ascii')
            
            requests.get(complete_url_trmode)
        except:
            return False
        return True

    def generator_stop(self):
        try:
            experiment = get_object_or_404(Experiment, pk=self.id)
            generator_url = experiment.generator.url()

            payload = {"enable": 0}
            
            json_trmode_selector = json.dumps(payload)
            base64_trmode_selector = base64.standard_b64encode(json_trmode_selector.encode('ascii'))
            
            trmode_url = generator_url + "trmode?params="
            url_trmode_selector = trmode_url + base64_trmode_selector.decode('ascii')
            requests.get(url_trmode_selector)
        except:
            return False
        return True
        
    def start(self):
        '''
        Configure and start experiments's devices
        '''
        all_status = Experiment.objects.filter(status=2)

        if self.status != 2:
            if len(all_status) == 0:
                data = {
                    'name': '{}@{}'.format(self.name, datetime.now().strftime('%Y-%m-%dT%H-%M-%S')),
                    'latitude': self.latitude,
                    'longitude': self.longitude,
                    'altitude': self.altitude,
                    'heading': self.heading
                }

                try:
                    data['pedestal'] = self.pedestal.start_device(name_experiment=data['name'])
                    time.sleep(1.0)
                    self.generator_start()
                    time.sleep(1.0)
                    data['usrp_tx'] = self.transmission_tx.start_device(name_experiment=data['name'])
                    time.sleep(1.0)
                    data['usrp_rx'] = self.reception_rx.start_device(name_experiment=data['name'])
                    time.sleep(0.1)
                    proc_url = 'http://'+os.environ['PROC_SITE']+'/start'
                    requests.post(proc_url, json=data)
                    
                except:
                    return 0
                return 2
            else:
                return 5
        else:
            return 2


    def stop(self):
        '''
        Stop experiments's devices
        PEDESTAL, GENERATOR & USRP's
        '''

        try:
            self.transmission_tx.stop_device()
            time.sleep(1.0)
            self.generator_stop()
            time.sleep(0.1)
            self.reception_rx.stop_device()
            time.sleep(0.1)
            self.pedestal.stop_device()
            time.sleep(0.1)
            proc_url = 'http://'+os.environ['PROC_SITE']+'/stop'
            requests.get(proc_url)
        except:
            return 0
        return 4

    def get_status(self):

        if self.status == 3:
            return

        confs =  Configuration.objects.filter(experiment=self, type=0)

        for conf in confs:
            conf.status_device()

        total = confs.aggregate(models.Sum('device__status'))['device__status__sum']

        if total==2*confs.count():
            status = 1
        elif total == 3*confs.count():
            status = 2
        else:
            status = 0

        self.status = status
        self.save()

    def status_color(self):
        color = 'muted'
        if self.status == 0:
            color = "danger"
        elif self.status == 1:
            color = "warning"
        elif self.status == 2:
            color = "success"
        elif self.status == 3:
            color = "info"

        return color

    def parms_to_dict(self):

        params = Params({})
        params.add(self.jsonify(), 'experiments')

        configurations = Configuration.objects.filter(experiment=self, type=0)

        for conf in configurations:
            params.add(conf.jsonify(), 'configurations')

        return params.data

    def dict_to_parms(self, parms, CONF_MODELS, id_exp=None):

        configurations = Configuration.objects.filter(experiment=self)

        if id_exp is not None:
            exp_parms = parms['experiments']['byId'][id_exp]
        else:
            exp_parms = parms['experiments']['byId'][parms['experiments']['allIds'][0]]

        if configurations:
            for configuration in configurations:
                configuration.delete()

        for id_conf in exp_parms['configurations']:
            conf_parms = parms['configurations']['byId'][id_conf]
            device     = Device.objects.filter(device_type__name=conf_parms['device_type'])[0]
            model      = CONF_MODELS[conf_parms['device_type']]
            conf = model(
                experiment = self,
                device = device,
                )
            conf.dict_to_parms(parms, id=id_conf)

        
        self.name = '{}-{}'.format(exp_parms['name'], datetime.now().strftime('%y%m%d'))
        self.save()

        return self

    def get_absolute_url(self):
        return reverse('url_experiment', args=[str(self.id)])

    def get_absolute_url_edit(self):
        return reverse('url_edit_experiment', args=[str(self.id)])

    def get_absolute_url_delete(self):
        return reverse('url_delete_experiment', args=[str(self.id)])

    def get_absolute_url_import(self):
        return reverse('url_import_experiment', args=[str(self.id)])

    def get_absolute_url_export(self):
        return reverse('url_export_experiment', args=[str(self.id)])

    def get_absolute_url_start(self):
        return reverse('url_start_experiment', args=[str(self.id)])

    def get_absolute_url_stop(self):
        return reverse('url_stop_experiment', args=[str(self.id)])


class Configuration(PolymorphicModel):

    id              = models.AutoField(primary_key=True)
    experiment      = models.CharField(default='empty', editable=False, max_length=64, null=True, blank=True)
    experiment_date = models.DateTimeField(default=datetime.now, editable=False)
    device          = models.ForeignKey('Device', verbose_name='Device', null=True, on_delete=models.CASCADE)
    type            = models.PositiveSmallIntegerField(default=0, choices=CONF_TYPES)
    created_date    = models.DateTimeField(auto_now_add=True)
    programmed_date = models.DateTimeField(auto_now=True)
    parameters      = models.TextField(default='{}')
    author          = models.ForeignKey(User, null=True, blank=True,on_delete=models.CASCADE)
    hash            = models.CharField(default='', max_length=64, null=True, blank=True)
    message         = ""

    class Meta:
        db_table = 'db_configurations'
        ordering = ('device__device_type__name',)

    def __str__(self):

        ret = u'{} '.format(self.device.device_type.name.upper())

        if 'mix' in [f.name for f in self._meta.get_fields()]:
            if self.mix:
                ret = '{} MIX '.format(self.device.device_type.name.upper())

        if 'label' in [f.name for f in self._meta.get_fields()]:
            ret += '{}'.format(self.label)

        return ret

    @property
    def name(self):

        return str(self)

    @property
    def label(self):

        return str(self)
    
    def jsonify(self):

        data = {}

        ignored = ('type', 'polymorphic_ctype', 'configuration_ptr',
                   'created_date', 'programmed_date', 'device',
                   'experiment', 'author')

        for field in self._meta.fields:
            if field.name in ignored:
                continue
            data[field.name] = field.value_from_object(self)

        data['device_type'] = self.device.device_type.name
        return data

    def clone(self, **kwargs):
        before_id = self.id

        self.pk = None
        self.id = None
        for attr, value in kwargs.items():
            setattr(self, attr, value)
        self.save()

        self.id = before_id
        return self

    def parms_to_dict(self):

        params = Params({})
        params.add(self.jsonify(), 'configurations')
        return params.data

    def parms_to_text(self):

        raise NotImplementedError("This method should be implemented in %s Configuration model" %str(self.device.device_type.name).upper())


    def parms_to_binary(self):

        raise NotImplementedError("This method should be implemented in %s Configuration model" %str(self.device.device_type.name).upper())


    def dict_to_parms(self, parameters, id=None):

        params = Params(parameters)

        if id:
            data = params.get_conf(id_conf=id)
        else:
            data = params.get_conf(dtype=self.device.device_type.name)

        for key, value in data.items():
            if key not in ('id', 'device_type'):
                setattr(self, key, value)
                
        self.save()


    def export_to_file(self, format="json"):

        content_type = ''

        if format == 'racp':
            content_type = 'text/plain'
            filename = '%s_%s.%s' %(self.device.device_type.name, self.name, 'racp')
            content = self.parms_to_text(file_format = 'racp')

        if format == 'text':
            content_type = 'text/plain'
            filename = '%s_%s.%s' %(self.device.device_type.name, self.name, self.device.device_type.name)
            content = self.parms_to_text()

        if format == 'binary':
            content_type = 'application/octet-stream'
            filename = '%s_%s.bin' %(self.device.device_type.name, self.name)
            content = self.parms_to_binary()

        if not content_type:
            content_type = 'application/json'
            filename = '%s_%s.json' %(self.device.device_type.name, self.name)
            content = json.dumps(self.parms_to_dict(), indent=2)
            

        fields = {'content_type':content_type,
                  'filename':filename,
                  'content':content
                  }

        return fields

    def import_from_file(self, fp):

        parms = {}

        path, ext = os.path.splitext(fp.name)

        if ext == '.json':
            parms = json.load(fp)

        return parms

    def status_device(self):

        self.message = 'Function not supported'
        return False


    def stop_device(self):

        self.message = 'Function not supported'
        return False


    def start_device(self):
        
        self.message = 'Function not supported'
        return False


    def write_device(self):

        self.message = 'Function not supported'
        return False


    def read_device(self):

        self.message = 'Function not supported'
        return False


    def get_absolute_url(self):
        return reverse('url_%s_conf' % self.device.device_type.name, args=[str(self.id)])

    def get_absolute_url_edit(self):
        return reverse('url_edit_%s_conf' % self.device.device_type.name, args=[str(self.id)])

    def get_absolute_url_delete(self):
        return reverse('url_delete_dev_conf', args=[str(self.id)])

    def get_absolute_url_import(self):
        return reverse('url_import_dev_conf', args=[str(self.id)])

    def get_absolute_url_export(self):
        return reverse('url_export_dev_conf', args=[str(self.id)])

    def get_absolute_url_write(self):
        return reverse('url_write_dev_conf', args=[str(self.id)])

    def get_absolute_url_read(self):
        return reverse('url_read_dev_conf', args=[str(self.id)])

    def get_absolute_url_start(self):
        return reverse('url_start_dev_conf', args=[str(self.id)])

    def get_absolute_url_stop(self):
        return reverse('url_stop_dev_conf', args=[str(self.id)])

    def get_absolute_url_status(self):
        return reverse('url_status_dev_conf', args=[str(self.id)])