# Re2o est un logiciel d'administration développé initiallement au rezometz. Il
# se veut agnostique au réseau considéré, de manière à être installable en
# quelques clics.
#
# Copyright © 2017  Gabriel Détraz
# Copyright © 2017  Lara Kermarec
# Copyright © 2017  Augustin Lemesle
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""
Forms for the topologie app of re2o.

The forms are used to:
    * create and delete switch ports, related to a switch.
    * create stacks and add switches to them (StackForm).
    * create, edit and delete a switch (NewSwitchForm, EditSwitchForm).
"""

from __future__ import unicode_literals

from django import forms
from django.forms import ModelForm
from django.db.models import Prefetch
from django.utils.translation import ugettext_lazy as _

from machines.models import Interface
from machines.forms import EditMachineForm, NewMachineForm
from re2o.mixins import FormRevMixin

from .models import (
    Port,
    Switch,
    Room,
    Stack,
    ModelSwitch,
    ConstructorSwitch,
    AccessPoint,
    SwitchBay,
    Building,
    Dormitory,
    PortProfile,
    ModuleSwitch,
    ModuleOnSwitch,
)


class PortForm(FormRevMixin, ModelForm):
    """Form used to manage a switch's port."""

    class Meta:
        model = Port
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(PortForm, self).__init__(*args, prefix=prefix, **kwargs)


class EditPortForm(FormRevMixin, ModelForm):
    """Form used to edit a switch's port: change in RADIUS or VLANs settings,
    assignement to a room, port or machine.

    A port is related to either a room, another port (uplink) or a machine (server or AP).
    """

    class Meta(PortForm.Meta):
        fields = [
            "room",
            "related",
            "machine_interface",
            "custom_profile",
            "state",
            "details",
        ]

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(EditPortForm, self).__init__(*args, prefix=prefix, **kwargs)
        self.fields[
            "machine_interface"
        ].queryset = Interface.objects.all().select_related("domain__extension")
        self.fields["related"].queryset = Port.objects.all().prefetch_related(
            "switch__machine_ptr__interface_set__domain__extension"
        )
        self.fields["room"].queryset = Room.objects.all().select_related(
            "building__dormitory"
        )


class AddPortForm(FormRevMixin, ModelForm):
    """Form used to add a switch's port. See EditPortForm."""

    class Meta(PortForm.Meta):
        fields = [
            "port",
            "room",
            "machine_interface",
            "related",
            "custom_profile",
            "state",
            "details",
        ]

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(AddPortForm, self).__init__(*args, prefix=prefix, **kwargs)
        self.fields[
            "machine_interface"
        ].queryset = Interface.objects.all().select_related("domain__extension")
        self.fields["related"].queryset = Port.objects.all().prefetch_related(
            Prefetch(
                "switch__interface_set",
                queryset=(
                    Interface.objects.select_related(
                        "ipv4__ip_type__extension"
                    ).select_related("domain__extension")
                ),
            )
        )


class StackForm(FormRevMixin, ModelForm):
    """Form used to create and edit stacks."""

    class Meta:
        model = Stack
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(StackForm, self).__init__(*args, prefix=prefix, **kwargs)


class AddAccessPointForm(NewMachineForm):
    """Form used to create access points."""

    class Meta:
        model = AccessPoint
        fields = ["location", "name"]


class EditAccessPointForm(EditMachineForm):
    """Form used to edit access points."""

    class Meta:
        model = AccessPoint
        fields = "__all__"


class EditSwitchForm(EditMachineForm):
    """Form used to edit switches."""

    class Meta:
        model = Switch
        fields = "__all__"


class NewSwitchForm(NewMachineForm):
    """Form used to create a switch."""

    class Meta(EditSwitchForm.Meta):
        fields = ["name", "switchbay", "number", "stack", "stack_member_id"]


class EditRoomForm(FormRevMixin, ModelForm):
    """Form used to edit a room."""

    class Meta:
        model = Room
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(EditRoomForm, self).__init__(*args, prefix=prefix, **kwargs)


class CreatePortsForm(forms.Form):
    """Form used to create switch ports lists."""

    begin = forms.IntegerField(label=_("Start:"), min_value=0)
    end = forms.IntegerField(label=_("End:"), min_value=0)


class EditModelSwitchForm(FormRevMixin, ModelForm):
    """Form used to edit switch models."""

    members = forms.ModelMultipleChoiceField(Switch.objects.all(), required=False)

    class Meta:
        model = ModelSwitch
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(EditModelSwitchForm, self).__init__(*args, prefix=prefix, **kwargs)
        instance = kwargs.get("instance", None)
        if instance:
            self.initial["members"] = Switch.objects.filter(model=instance)

    def save(self, commit=True):
        instance = super().save(commit)
        instance.switch_set = self.cleaned_data["members"]
        return instance


class EditConstructorSwitchForm(FormRevMixin, ModelForm):
    """Form used to edit switch constructors."""

    class Meta:
        model = ConstructorSwitch
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(EditConstructorSwitchForm, self).__init__(*args, prefix=prefix, **kwargs)


class EditSwitchBayForm(FormRevMixin, ModelForm):
    """Form used to edit switch bays."""

    members = forms.ModelMultipleChoiceField(Switch.objects.all(), required=False)

    class Meta:
        model = SwitchBay
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(EditSwitchBayForm, self).__init__(*args, prefix=prefix, **kwargs)
        instance = kwargs.get("instance", None)
        if instance:
            self.initial["members"] = Switch.objects.filter(switchbay=instance)

    def save(self, commit=True):
        instance = super().save(commit)
        instance.switch_set = self.cleaned_data["members"]
        return instance


class EditBuildingForm(FormRevMixin, ModelForm):
    """Form used to edit buildings."""

    class Meta:
        model = Building
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(EditBuildingForm, self).__init__(*args, prefix=prefix, **kwargs)


class EditDormitoryForm(FormRevMixin, ModelForm):
    """Form used to edit dormitories."""

    class Meta:
        model = Dormitory
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(EditDormitoryForm, self).__init__(*args, prefix=prefix, **kwargs)


class EditPortProfileForm(FormRevMixin, ModelForm):
    """Form used to edit port profiles."""

    class Meta:
        model = PortProfile
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(EditPortProfileForm, self).__init__(*args, prefix=prefix, **kwargs)


class EditModuleForm(FormRevMixin, ModelForm):
    """Form used to add and edit switch modules."""

    class Meta:
        model = ModuleSwitch
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(EditModuleForm, self).__init__(*args, prefix=prefix, **kwargs)


class EditSwitchModuleForm(FormRevMixin, ModelForm):
    """Form used to add and edit modules related to a switch."""

    class Meta:
        model = ModuleOnSwitch
        fields = "__all__"

    def __init__(self, *args, **kwargs):
        prefix = kwargs.pop("prefix", self.Meta.model.__name__)
        super(EditSwitchModuleForm, self).__init__(*args, prefix=prefix, **kwargs)
