from django import forms
from django.contrib.auth.forms import UserCreationForm
from django.core.exceptions import FieldDoesNotExist
from django.forms import ModelForm

from core.db import QueryError
from core.lib.rules import NotificationRuleData

from .models import NotificationRule, NotificationSettings, User

# from django.forms import ModelForm


# Create your forms here.
class RestrictedFormMixin:
    """
    This mixin is used to restrict the queryset of a form to the current user.
    The request object is passed from the view.
    Fieldargs is used to pass additional arguments to the queryset filter.
    """

    fieldargs = {}

    def __init__(self, *args, **kwargs):
        # self.fieldargs = {}
        self.request = kwargs.pop("request")
        super().__init__(*args, **kwargs)
        for field in self.fields:
            # Check it's not something like a CharField which has no queryset
            if not hasattr(self.fields[field], "queryset"):
                continue

            model = self.fields[field].queryset.model
            # Check if the model has a user field
            try:
                model._meta.get_field("user")
                # Add the user to the queryset filters
                self.fields[field].queryset = model.objects.filter(
                    user=self.request.user, **self.fieldargs.get(field, {})
                )
            except FieldDoesNotExist:
                pass


class NewUserForm(UserCreationForm):
    email = forms.EmailField(required=True)

    class Meta:
        model = User
        fields = (
            "username",
            "email",
            "first_name",
            "last_name",
            "password1",
            "password2",
        )

    def save(self, commit=True):
        user = super(NewUserForm, self).save(commit=False)
        user.email = self.cleaned_data["email"]
        if commit:
            user.save()
        return user


class CustomUserCreationForm(UserCreationForm):
    class Meta:
        model = User
        fields = "__all__"


class NotificationSettingsForm(RestrictedFormMixin, ModelForm):
    class Meta:
        model = NotificationSettings
        fields = (
            "ntfy_topic",
            "ntfy_url",
        )
        help_texts = {
            "ntfy_topic": "The topic to send notifications to.",
            "ntfy_url": "Custom NTFY server. Leave blank to use the default server.",
        }


class NotificationRuleForm(RestrictedFormMixin, ModelForm):
    class Meta:
        model = NotificationRule
        fields = (
            "name",
            "enabled",
            "data",
        )
        help_texts = {
            "name": "The name of the rule.",
            "enabled": "Whether the rule is enabled.",
            "data": "The notification rule definition.",
        }

    def clean(self):
        cleaned_data = super(NotificationRuleForm, self).clean()
        data = cleaned_data.get("data")
        try:
            parsed_data = NotificationRuleData(self.request.user, data)
        except ValueError as e:
            self.add_error("data", f"Parsing error: {e}")
            return
        except QueryError as e:
            self.add_error("data", f"Query error: {e}")
            return

        # Write back the validated data
        # We need this to populate the index and source variable if
        # they are not set
        to_store = str(parsed_data)
        cleaned_data["data"] = to_store

        return cleaned_data