from __future__ import unicode_literals

import yaml

from django import forms
from django.core.exceptions import ValidationError
from django.utils.translation import ugettext_lazy as _

from mayan.apps.common.forms import DetailForm
from mayan.apps.common.serialization import yaml_load

from .classes import ControlCode
from .models import ControlSheet, ControlSheetCode


class ControlSheetCodeClassSelectionForm(forms.Form):
    control_code = forms.ChoiceField(
        choices=(), help_text=_('Available control codes.'),
        label=_('Control code'),
    )

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

        self.fields[
            'control_code'
        ].choices = ControlCode.get_choices()


class ControlSheetCodeForm(forms.ModelForm):
    class Meta:
        fields = ('arguments', 'order')
        model = ControlSheetCode

    def __init__(self, *args, **kwargs):
        #control_code_name = kwargs.pop('control_code_name', None)
        super(ControlSheetCodeForm, self).__init__(*args, **kwargs)

        """
        if not control_code_name:
            # Get the template name when the control_code is being edited.
            template_name = getattr(
                self.instance.get_control_code_class(), 'template_name',
                None
            )
        else:
            # Get the template name when the control_code is being created
            template_name = getattr(
                BaseTransformation.get(name=control_code_name),
                'template_name', None
            )
        """
        #if template_name:
        #    self.fields['arguments'].widget.attrs['class'] = 'hidden'
        #    self.fields['order'].widget.attrs['class'] = 'hidden'

    def clean(self):
        try:
            yaml_load(stream=self.cleaned_data['arguments'])
        except yaml.YAMLError:
            raise ValidationError(
                _(
                    '"%s" not a valid entry.'
                ) % self.cleaned_data['arguments']
            )