import json

from django import forms
from django.conf import settings
from django.contrib.postgres.forms import SimpleArrayField

from utilities.choices import ColorChoices
from .utils import add_blank_choice, parse_numeric_range

__all__ = (
    'APISelect',
    'APISelectMultiple',
    'BulkEditNullBooleanSelect',
    'ColorSelect',
    'ContentTypeSelect',
    'DatePicker',
    'DateTimePicker',
    'NumericArrayField',
    'SelectSpeedWidget',
    'SelectWithDisabled',
    'SelectWithPK',
    'SlugWidget',
    'SmallTextarea',
    'StaticSelect',
    'StaticSelectMultiple',
    'TimePicker',
)


class SmallTextarea(forms.Textarea):
    """
    Subclass used for rendering a smaller textarea element.
    """
    pass


class SlugWidget(forms.TextInput):
    """
    Subclass TextInput and add a slug regeneration button next to the form field.
    """
    template_name = 'widgets/sluginput.html'


class ColorSelect(forms.Select):
    """
    Extends the built-in Select widget to colorize each <option>.
    """
    option_template_name = 'widgets/colorselect_option.html'

    def __init__(self, *args, **kwargs):
        kwargs['choices'] = add_blank_choice(ColorChoices)
        super().__init__(*args, **kwargs)
        self.attrs['class'] = 'netbox-color-select'


class BulkEditNullBooleanSelect(forms.NullBooleanSelect):
    """
    A Select widget for NullBooleanFields
    """

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

        # Override the built-in choice labels
        self.choices = (
            ('1', '---------'),
            ('2', 'Yes'),
            ('3', 'No'),
        )
        self.attrs['class'] = 'netbox-static-select'


class SelectWithDisabled(forms.Select):
    """
    Modified the stock Select widget to accept choices using a dict() for a label. The dict for each option must include
    'label' (string) and 'disabled' (boolean).
    """
    option_template_name = 'widgets/selectwithdisabled_option.html'


class StaticSelect(SelectWithDisabled):
    """
    A static <select/> form widget which is client-side rendered.
    """
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.attrs['class'] = 'netbox-static-select'


class StaticSelectMultiple(StaticSelect, forms.SelectMultiple):

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

        self.attrs['data-multiple'] = 1


class SelectWithPK(StaticSelect):
    """
    Include the primary key of each option in the option label (e.g. "Router7 (4721)").
    """
    option_template_name = 'widgets/select_option_with_pk.html'


class ContentTypeSelect(StaticSelect):
    """
    Appends an `api-value` attribute equal to the slugified model name for each ContentType. For example:
        <option value="37" api-value="console-server-port">console server port</option>
    This attribute can be used to reference the relevant API endpoint for a particular ContentType.
    """
    option_template_name = 'widgets/select_contenttype.html'


class SelectSpeedWidget(forms.NumberInput):
    """
    Speed field with dropdown selections for convenience.
    """
    template_name = 'widgets/select_speed.html'


class NumericArrayField(SimpleArrayField):

    def to_python(self, value):
        if not value:
            return []
        if isinstance(value, str):
            value = ','.join([str(n) for n in parse_numeric_range(value)])
        return super().to_python(value)


class APISelect(SelectWithDisabled):
    """
    A select widget populated via an API call

    :param api_url: API endpoint URL. Required if not set automatically by the parent field.
    """
    def __init__(self, api_url=None, full=False, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.attrs['class'] = 'netbox-api-select'
        if api_url:
            self.attrs['data-url'] = '/{}{}'.format(settings.BASE_PATH, api_url.lstrip('/'))  # Inject BASE_PATH

    def add_query_param(self, name, value):
        """
        Add details for an additional query param in the form of a data-* JSON-encoded list attribute.

        :param name: The name of the query param
        :param value: The value of the query param
        """
        key = f'data-query-param-{name}'

        values = json.loads(self.attrs.get(key, '[]'))
        if type(value) in (list, tuple):
            values.extend([str(v) for v in value])
        else:
            values.append(str(value))

        self.attrs[key] = json.dumps(values)


class APISelectMultiple(APISelect, forms.SelectMultiple):

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

        self.attrs['data-multiple'] = 1


class DatePicker(forms.TextInput):
    """
    Date picker using Flatpickr.
    """
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.attrs['class'] = 'date-picker'
        self.attrs['placeholder'] = 'YYYY-MM-DD'


class DateTimePicker(forms.TextInput):
    """
    DateTime picker using Flatpickr.
    """
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.attrs['class'] = 'datetime-picker'
        self.attrs['placeholder'] = 'YYYY-MM-DD hh:mm:ss'


class TimePicker(forms.TextInput):
    """
    Time picker using Flatpickr.
    """
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.attrs['class'] = 'time-picker'
        self.attrs['placeholder'] = 'hh:mm:ss'