import os
import json

from django import forms
from django.utils.safestring import mark_safe
from apps.main.models import Device
from apps.main.forms import add_empty_choice
from .models import USRPTXConfiguration

def create_choices_from_model(model, conf_id, all_choice=False):

    instance = globals()[model]
    choices = instance.objects.all().values_list('pk', 'name')

    return choices

class USRPTXConfigurationForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        super(USRPTXConfigurationForm, self).__init__(*args, **kwargs)

        instance = getattr(self, 'instance', None)

        if instance and instance.pk:

            devices = Device.objects.filter(device_type__name='usrp_tx')
            #if instance.experiment:
                #self.fields['experiment'].widget.attrs['read_only'] = True
                #self.fields['experiment'].widget.choices = [(instance.experiment.id, instance.experiment)]
            #self.fields['device'].widget.choices = [(device.id, device) for device in devices]

        if 'initial' in kwargs and 'experiment' in kwargs['initial'] and kwargs['initial']['experiment'] not in (0, '0'):
            self.fields['experiment'].widget.attrs['readonly'] = True

    class Meta:
        model = USRPTXConfiguration
        exclude = ('type', 'parameters', 'status', 'total_units', 'author', 'hash')

    def clean(self):
        form_data = super(USRPTXConfigurationForm, self).clean()
        return form_data

    def save(self, *args, **kwargs):
        conf = super(USRPTXConfigurationForm, self).save(*args, **kwargs)
        conf.save()
        return conf

class USRPTXEditionForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        super(USRPTXEditionForm, self).__init__(*args, **kwargs)

        instance = getattr(self, 'instance', None)

        if instance and instance.pk:

            devices = Device.objects.filter(device_type__name='usrp_tx')
            #if instance.experiment:
                #self.fields['experiment'].widget.attrs['read_only'] = True
                #self.fields['experiment'].widget.choices = [(instance.experiment.id, instance.experiment)]
            #self.fields['device'].widget.choices = [(device.id, device) for device in devices]

        if 'initial' in kwargs and 'experiment' in kwargs['initial'] and kwargs['initial']['experiment'] not in (0, '0'):
            self.fields['experiment'].widget.attrs['readonly'] = True

    class Meta:
        model = USRPTXConfiguration
        exclude = ('template', 'device', 'label', 'ip_address', 'daughterboard', 'antenna', 'type', 'parameters', 'status', 'total_units', 'author', 'hash')

    def clean(self):
        form_data = super(USRPTXEditionForm, self).clean()
        return form_data

    def save(self, *args, **kwargs):
        conf = super(USRPTXEditionForm, self).save(*args, **kwargs)
        conf.save()
        return conf

class ExtFileField(forms.FileField):
    """
    Same as forms.FileField, but you can specify a file extension whitelist.

    >>> from django.core.files.uploadedfile import SimpleUploadedFile
    >>>
    >>> t = ExtFileField(ext_whitelist=(".pdf", ".txt"))
    >>>
    >>> t.clean(SimpleUploadedFile('filename.pdf', 'Some File Content'))
    >>> t.clean(SimpleUploadedFile('filename.txt', 'Some File Content'))
    >>>
    >>> t.clean(SimpleUploadedFile('filename.exe', 'Some File Content'))
    Traceback (most recent call last):
    ...
    ValidationError: [u'Not allowed filetype!']
    """
    def __init__(self, *args, **kwargs):
        extensions = kwargs.pop("extensions")
        self.extensions = [i.lower() for i in extensions]

        super(ExtFileField, self).__init__(*args, **kwargs)

    def clean(self, *args, **kwargs):
        data = super(ExtFileField, self).clean(*args, **kwargs)
        filename = data.name
        ext = os.path.splitext(filename)[1]
        ext = ext.lower()
        if ext not in self.extensions:
            raise forms.ValidationError('Not allowed file type: %s' % ext)

class USRPTXImportForm(forms.Form):

    file_name = ExtFileField(extensions=['.racp', '.json', '.dat'])