"""
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, PartRelated
from .models import BomItem
from .models import PartParameterTemplate, PartParameter
from .models import PartCategoryParameterTemplate
from .models import PartTestTemplate
from .models import PartSellPriceBreak

from common.models import Currency


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 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 BomDuplicateForm(HelperForm):
    """
    Simple confirmation form for BOM duplication.

    Select which parent to select from.
    """

    parent = PartModelChoiceField(
        label=_('Parent Part'),
        help_text=_('Select parent part to copy BOM from'),
        queryset=Part.objects.filter(is_template=True),
    )

    clear = forms.BooleanField(
        required=False, initial=True,
        help_text=_('Clear existing BOM items')
    )

    confirm = forms.BooleanField(
        required=False, initial=False,
        help_text=_('Confirm BOM duplication')
    )

    class Meta:
        model = Part
        fields = [
            'parent',
            'clear',
            'confirm',
        ]


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 CreatePartRelatedForm(HelperForm):
    """ Form for creating a PartRelated object """

    class Meta:
        model = PartRelated
        fields = [
            'part_1',
            'part_2',
        ]
        labels = {
            'part_2': _('Related Part'),
        }

    def save(self):
        """ Disable model saving """

        return super(CreatePartRelatedForm, self).save(commit=False)


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',
    }

    bom_copy = forms.BooleanField(required=False,
                                  initial=True,
                                  help_text=_("Duplicate all BOM data for this part"),
                                  label=_('Copy BOM'),
                                  widget=forms.HiddenInput())

    parameters_copy = forms.BooleanField(required=False,
                                         initial=True,
                                         help_text=_("Duplicate all parameter data for this part"),
                                         label=_('Copy Parameters'),
                                         widget=forms.HiddenInput())

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

    category_templates = forms.BooleanField(required=False,
                                            initial=False,
                                            help_text=_('Create parameters based on default category templates'),
                                            label=_('Copy category parameter templates'),
                                            widget=forms.HiddenInput())

    class Meta:
        model = Part
        fields = [
            'bom_copy',
            'parameters_copy',
            'confirm_creation',
            'category',
            'category_templates',
            '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 EditCategoryParameterTemplateForm(HelperForm):
    """ Form for editing a PartCategoryParameterTemplate object """

    add_to_all_categories = forms.BooleanField(required=False,
                                               initial=False,
                                               help_text=_('Add parameter template to all categories'))

    class Meta:
        model = PartCategoryParameterTemplate
        fields = [
            'category',
            'parameter_template',
            'default_value',
            'add_to_all_categories',
        ]


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',
            'optional',
        ]

        # 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',
        ]


class EditPartSalePriceBreakForm(HelperForm):
    """
    Form for creating / editing a sale price for a part
    """

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

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

    class Meta:
        model = PartSellPriceBreak
        fields = [
            'part',
            'quantity',
            'cost',
            'currency',
        ]