from django import forms
from django.apps import apps
from django.core.exceptions import ValidationError
from django.db import models
from django.utils.safestring import mark_safe
from django.utils.translation import gettext_lazy as _
from djangocms_attributes_field import fields

from . import settings
from .helpers import first_choice

if apps.is_installed("djangocms_text"):
    from djangocms_text.fields import HTMLFormField  # noqa F401

    HTMLsanitized = True
elif apps.is_installed("djangocms_text_ckeditor"):  # pragma: no cover
    from djangocms_text_ckeditor.fields import HTMLFormField  # noqa F401

    HTMLsanitized = True
else:  # pragma: no cover
    HTMLFormField = forms.CharField
    HTMLsanitized = False


class TemplateChoiceMixin:
    """Mixin that hides the template field if only one template is available and is selected"""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if "template" in self.fields:
            template_field = self.fields["template"]
            choices = template_field.choices
            instance = kwargs.get("instance", None)
            if len(choices) == 1 and (instance is None or instance.config.get("template", "") == choices[0][0]):
                template_field.widget = forms.HiddenInput()


class ButtonGroup(forms.RadioSelect):
    template_name = "djangocms_frontend/admin/widgets/button_group.html"
    option_template_name = "djangocms_frontend/admin/widgets/button_group_option.html"

    class Media:
        css = {"all": ("djangocms_frontend/css/button_group.css",)}


class ColoredButtonGroup(ButtonGroup):  # lgtm [py/missing-call-to-init]
    option_template_name = "djangocms_frontend/admin/widgets/button_group_color_option.html"

    class Media:
        css = settings.ADMIN_CSS

    def __init__(self, *args, **kwargs):
        kwargs.update({"attrs": {**kwargs.get("attrs", {}), **dict(property="color")}})
        super().__init__(*args, **kwargs)


class IconGroup(ButtonGroup):  # lgtm [py/missing-call-to-init]
    option_template_name = "djangocms_frontend/admin/widgets/icon_group_option.html"

    def __init__(self, *args, **kwargs):
        kwargs.update({"attrs": {**dict(property="icon"), **kwargs.get("attrs", {})}})
        super().__init__(*args, **kwargs)


class IconMultiselect(forms.CheckboxSelectMultiple):  # lgtm [py/missing-call-to-init]
    template_name = "djangocms_frontend/admin/widgets/button_group.html"
    option_template_name = "djangocms_frontend/admin/widgets/icon_group_option.html"

    class Media:
        css = {"all": ("djangocms_frontend/css/button_group.css",)}

    def __init__(self, *args, **kwargs):
        kwargs.update({"attrs": {**kwargs.get("attrs", {}), **dict(property="icon")}})
        super().__init__(*args, **kwargs)


class OptionalDeviceChoiceField(forms.MultipleChoiceField):  # lgtm [py/missing-call-to-init]
    def __init__(self, **kwargs):
        kwargs.setdefault("choices", settings.DEVICE_CHOICES)
        kwargs.setdefault("initial", None)
        kwargs.setdefault("widget", IconMultiselect())
        super().__init__(**kwargs)

    def prepare_value(self, value):
        if value is None:
            value = [size for size, _ in settings.DEVICE_CHOICES]
        return super().prepare_value(value)

    def clean(self, value):
        value = super().clean(value)
        if len(value) == len(settings.DEVICE_CHOICES):
            return None
        return value


class DeviceChoiceField(OptionalDeviceChoiceField):
    def clean(self, value):
        value = super().clean(value)
        if isinstance(value, list) and len(value) == 0:
            raise ValidationError(_("Please select at least one device size"), code="invalid")
        return value


class AttributesField(fields.AttributesField):
    def __init__(self, *args, **kwargs):
        if "verbose_name" not in kwargs:
            kwargs["verbose_name"] = _("Attributes")
        if "blank" not in kwargs:
            kwargs["blank"] = True
        super().__init__(*args, **kwargs)


class AttributesFormField(fields.AttributesFormField):
    def __init__(self, *args, **kwargs):
        kwargs.setdefault("label", _("Attributes"))
        kwargs.setdefault("required", False)
        kwargs.setdefault("widget", fields.AttributesWidget)
        self.excluded_keys = kwargs.pop("excluded_keys", [])
        super().__init__(*args, **kwargs)


try:
    fields.AttributesWidget(sorted=True)  # does djangocms-attributes-field support sorted param?
    CHOICESWIDGETPARAMS = dict(sorted=False)  # use unsorted variant
except TypeError:
    CHOICESWIDGETPARAMS = dict()  # Fallback for djangocms-attributes-field < 2.1


class ChoicesFormField(fields.AttributesFormField):
    """Simple choices field based on attributes field. Needs to be extended to
    allow to sort choices"""

    def __init__(self, *args, **kwargs):
        kwargs.setdefault("label", _("Choices"))
        kwargs.setdefault("required", True)
        kwargs.setdefault("widget", fields.AttributesWidget(**CHOICESWIDGETPARAMS))
        self.excluded_keys = kwargs.pop("excluded_keys", [])
        super().__init__(*args, **kwargs)

    def clean(self, value):
        if not value:
            raise ValidationError(
                mark_safe(_("Please enter at least one choice. Use the <code>+</code> symbol to add a choice.")),
                code="empty",
            )
        return [(key, value) for key, value in value.items()]

    def prepare_value(self, value):
        if not value:
            return {}
        if isinstance(value, dict):  # Already dict? OK!
            return super().prepare_value(value)
        # Turn items into dict
        return super().prepare_value({key: value for key, value in value})


class TagTypeField(models.CharField):
    def __init__(self, *args, **kwargs):
        kwargs.setdefault("verbose_name", _("Tag type"))
        # Choices are not defined at database level but in the form field below
        kwargs.setdefault("default", first_choice(settings.TAG_CHOICES))
        kwargs.setdefault("max_length", 255)
        kwargs.setdefault("help_text", _("Select the HTML tag to be used."))
        super().__init__(*args, **kwargs)


class TagTypeFormField(forms.ChoiceField):  # lgtm [py/missing-call-to-init]
    def __init__(self, *args, **kwargs):
        kwargs.setdefault("label", _("Tag type"))
        kwargs.setdefault("choices", settings.TAG_CHOICES)
        kwargs.setdefault("initial", first_choice(settings.TAG_CHOICES))
        kwargs.setdefault("required", False)
        kwargs.setdefault("widget", ButtonGroup(attrs=dict(property="text")))
        super().__init__(*args, **kwargs)


class AutoNumberInput(forms.NumberInput):  # lgtm [py/missing-call-to-init]
    class Media:
        js = ("djangocms_frontend/js/auto_input.js",)

    def __init__(self, *args, **kwargs):
        kwargs.setdefault("attrs", {"class": "auto-field"})
        super().__init__(*args, **kwargs)