"""
Django Forms for interacting with Part objects
"""

# -*- coding: utf-8 -*-
from __future__ import unicode_literals

from InvenTree.forms import HelperForm
from InvenTree.helpers import GetExportFormats
from InvenTree.fields import RoundingDecimalFormField

from mptt.fields import TreeNodeChoiceField
from django import forms
from django.utils.translation import ugettext as _

from .models import Part, PartCategory, PartAttachment
from .models import BomItem
from .models import PartParameterTemplate, PartParameter
from .models import PartTestTemplate

from common.models import Currency


class PartImageForm(HelperForm):
    """ Form for uploading a Part image """

    class Meta:
        model = Part
        fields = [
            'image',
        ]


class EditPartTestTemplateForm(HelperForm):
    """ Class for creating / editing a PartTestTemplate object """

    class Meta:
        model = PartTestTemplate

        fields = [
            'part',
            'test_name',
            'description',
            'required',
            'requires_value',
            'requires_attachment',
        ]


class BomExportForm(forms.Form):
    """ Simple form to let user set BOM export options,
    before exporting a BOM (bill of materials) file.
    """

    file_format = forms.ChoiceField(label=_("File Format"), help_text=_("Select output file format"))

    cascading = forms.BooleanField(label=_("Cascading"), required=False, initial=True, help_text=_("Download cascading / multi-level BOM"))

    levels = forms.IntegerField(label=_("Levels"), required=True, initial=0, help_text=_("Select maximum number of BOM levels to export (0 = all levels)"))

    parameter_data = forms.BooleanField(label=_("Include Parameter Data"), required=False, initial=False, help_text=_("Include part parameters data in exported BOM"))

    stock_data = forms.BooleanField(label=_("Include Stock Data"), required=False, initial=False, help_text=_("Include part stock data in exported BOM"))

    supplier_data = forms.BooleanField(label=_("Include Supplier Data"), required=False, initial=True, help_text=_("Include part supplier data in exported BOM"))

    def get_choices(self):
        """ BOM export format choices """

        return [(x, x.upper()) for x in GetExportFormats()]

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

        self.fields['file_format'].choices = self.get_choices()


class BomValidateForm(HelperForm):
    """ Simple confirmation form for BOM validation.
    User is presented with a single checkbox input,
    to confirm that the BOM for this part is valid
    """

    validate = forms.BooleanField(required=False, initial=False, help_text=_('Confirm that the BOM is correct'))

    class Meta:
        model = Part
        fields = [
            'validate'
        ]


class BomUploadSelectFile(HelperForm):
    """ Form for importing a BOM. Provides a file input box for upload """

    bom_file = forms.FileField(label='BOM file', required=True, help_text=_("Select BOM file to upload"))

    class Meta:
        model = Part
        fields = [
            'bom_file',
        ]


class EditPartAttachmentForm(HelperForm):
    """ Form for editing a PartAttachment object """

    class Meta:
        model = PartAttachment
        fields = [
            'part',
            'attachment',
            'comment'
        ]


class SetPartCategoryForm(forms.Form):
    """ Form for setting the category of multiple Part objects """

    part_category = TreeNodeChoiceField(queryset=PartCategory.objects.all(), required=True, help_text=_('Select part category'))


class EditPartForm(HelperForm):
    """ Form for editing a Part object """

    field_prefix = {
        'keywords': 'fa-key',
        'link': 'fa-link',
        'IPN': 'fa-hashtag',
    }

    deep_copy = forms.BooleanField(required=False,
                                   initial=True,
                                   help_text=_("Perform 'deep copy' which will duplicate all BOM data for this part"),
                                   widget=forms.HiddenInput())

    confirm_creation = forms.BooleanField(required=False,
                                          initial=False,
                                          help_text=_('Confirm part creation'),
                                          widget=forms.HiddenInput())

    class Meta:
        model = Part
        fields = [
            'deep_copy',
            'confirm_creation',
            'category',
            'name',
            'IPN',
            'description',
            'revision',
            'keywords',
            'variant_of',
            'link',
            'default_location',
            'default_supplier',
            'units',
            'minimum_stock',
        ]


class EditPartParameterTemplateForm(HelperForm):
    """ Form for editing a PartParameterTemplate object """

    class Meta:
        model = PartParameterTemplate
        fields = [
            'name',
            'units'
        ]


class EditPartParameterForm(HelperForm):
    """ Form for editing a PartParameter object """

    class Meta:
        model = PartParameter
        fields = [
            'part',
            'template',
            'data'
        ]


class EditCategoryForm(HelperForm):
    """ Form for editing a PartCategory object """

    field_prefix = {
        'default_keywords': 'fa-key',
    }

    class Meta:
        model = PartCategory
        fields = [
            'parent',
            'name',
            'description',
            'default_location',
            'default_keywords',
        ]


class PartModelChoiceField(forms.ModelChoiceField):
    """ Extending string representation of Part instance with available stock """
    def label_from_instance(self, part):
        return f'{part} - {part.available_stock}'


class EditBomItemForm(HelperForm):
    """ Form for editing a BomItem object """

    quantity = RoundingDecimalFormField(max_digits=10, decimal_places=5)

    sub_part = PartModelChoiceField(queryset=Part.objects.all())

    class Meta:
        model = BomItem
        fields = [
            'part',
            'sub_part',
            'quantity',
            'reference',
            'overage',
            'note'
        ]

        # Prevent editing of the part associated with this BomItem
        widgets = {'part': forms.HiddenInput()}


class PartPriceForm(forms.Form):
    """ Simple form for viewing part pricing information """

    quantity = forms.IntegerField(
        required=True,
        initial=1,
        help_text=_('Input quantity for price calculation')
    )

    currency = forms.ModelChoiceField(queryset=Currency.objects.all(), label='Currency', help_text=_('Select currency for price calculation'))

    class Meta:
        model = Part
        fields = [
            'quantity',
            'currency',
        ]