import re

from django import forms
from django.utils.translation import gettext_lazy as _


class AddNetPool(forms.Form):
    name = forms.CharField(
        error_messages={"required": _("No pool name has been entered")},
        max_length=20
    )
    subnet = forms.CharField(
        error_messages={"required": _("No IPv4 subnet has been entered")},
        max_length=20,
        required=False,
    )
    subnet6 = forms.CharField(
        error_messages={"required": _("No IPv6 subnet has been entered")},
        max_length=42,
        required=False,
    )
    forward = forms.CharField(max_length=100)
    dhcp4 = forms.BooleanField(required=False)
    dhcp6 = forms.BooleanField(required=False)
    fixed = forms.BooleanField(required=False)
    bridge_name = forms.CharField(max_length=20, required=False)
    openvswitch = forms.BooleanField(required=False)

    def clean_name(self):
        name = self.cleaned_data["name"]
        have_symbol = re.match(r"^[a-zA-Z0-9\.\_\-]+$", name)
        if not have_symbol:
            raise forms.ValidationError(
                _("The pool name must not contain any special characters")
            )
        elif len(name) > 20:
            raise forms.ValidationError(
                _("The pool name must not exceed 20 characters")
            )
        return name

    def clean_subnet(self):
        subnet = self.cleaned_data["subnet"]
        have_symbol = re.match("^[0-9./]+$", subnet if subnet else ".")
        if not have_symbol:
            raise forms.ValidationError(
                _("The IPv4 subnet must not contain any special characters")
            )
        elif len(subnet) > 20:
            raise forms.ValidationError(
                _("The IPv4 subnet must not exceed 20 characters")
            )
        return subnet

    def clean_subnet6(self):
        subnet = self.cleaned_data["subnet6"]
        have_symbol = re.match("^[0-9a-fA-F:/]+$", subnet if subnet else ":")
        if not have_symbol:
            raise forms.ValidationError(
                _("The IPv6 subnet must not contain any special characters")
            )
        elif len(subnet) > 42:
            raise forms.ValidationError(
                _("The IPv6 subnet must not exceed 42 characters")
            )
        return subnet

    def clean_bridge_name(self):
        bridge_name = self.cleaned_data["bridge_name"]
        if self.cleaned_data["forward"] in ["bridge", "macvtap"]:
            have_symbol = re.match(r"^[a-zA-Z0-9\.\_\:\-]+$", bridge_name)
            if not have_symbol:
                raise forms.ValidationError(
                    _("The pool bridge name must not contain any special characters")
                )
            elif len(bridge_name) > 20:
                raise forms.ValidationError(
                    _("The pool bridge name must not exceed 20 characters")
                )
            return bridge_name