"""
Author: Michel Peltriaux
Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
Contact: michel.peltriaux@sgdnord.rlp.de
Created on: 07.12.20

"""
from dal_select2.views import Select2QuerySetView
from django.contrib.auth.models import User
from django.db.models import Q

from codelist.models import KonovaCode
from codelist.settings import CODELIST_COMPENSATION_ACTION_ID, CODELIST_BIOTOPES_ID, CODELIST_LAW_ID, \
    CODELIST_REGISTRATION_OFFICE_ID, CODELIST_CONSERVATION_OFFICE_ID, CODELIST_PROCESS_TYPE_ID
from compensation.models import EcoAccount
from intervention.models import Intervention


class EcoAccountAutocomplete(Select2QuerySetView):
    """ Autocomplete for ecoAccount entries

    Only returns entries that are accessible for the requesting user and already are recorded

    """
    def get_queryset(self):
        if self.request.user.is_anonymous:
            return EcoAccount.objects.none()
        qs = EcoAccount.objects.filter(
            deleted=None,
            recorded__isnull=False,
            users__in=[self.request.user],
        ).order_by(
            "identifier"
        )
        if self.q:
            qs = qs.filter(
                identifier__icontains=self.q
            )
        return qs


class InterventionAutocomplete(Select2QuerySetView):
    """ Autocomplete for intervention entries

    Only returns entries that are accessible for the requesting user

    """
    def get_queryset(self):
        if self.request.user.is_anonymous:
            return Intervention.objects.none()
        qs = Intervention.objects.filter(
            deleted=None,
            users__in=[self.request.user],
        ).order_by(
            "identifier"
        )
        if self.q:
            qs = qs.filter(
                identifier__icontains=self.q
            )
        return qs


class ShareUserAutocomplete(Select2QuerySetView):
    """ Autocomplete for intervention entries

    Only returns entries that are accessible for the requesting user

    """
    def get_queryset(self):
        if self.request.user.is_anonymous:
            return User.objects.none()
        exclude_user_ids = self.forwarded.get("users", [None])
        _exclude = {"id__in": exclude_user_ids}
        qs = User.objects.all().exclude(
            **_exclude
        ).order_by(
            "username"
        )
        if self.q:
            qs = qs.filter(
                username__istartswith=self.q
            )
        return qs


class KonovaCodeAutocomplete(Select2QuerySetView):
    """
    Provides simple autocomplete functionality for codes

    Parameter support:
    * q: Search for a word inside long_name of a code
    * c: Search inside a special codelist

    """
    def get_queryset(self):
        if self.request.user.is_anonymous:
            return KonovaCode.objects.none()
        qs = KonovaCode.objects.filter(
            is_archived=False,
            is_selectable=True,
            is_leaf=True,
        ).order_by(
            "long_name"
        )
        if self.c:
            qs = qs.filter(
                code_lists__in=[self.c]
            )
        if self.q:
            # Remove whitespaces from self.q and split input in all keywords (if multiple given)
            q = dict.fromkeys(self.q.strip().split(" "))
            # Create one filter looking up for all keys where all keywords can be found in the same result
            _filter = Q()
            for keyword in q:
                q_or = Q()
                q_or |= Q(long_name__icontains=keyword)
                q_or |= Q(short_name__icontains=keyword)
                q_or |= Q(parent__long_name__icontains=keyword)
                q_or |= Q(parent__short_name__icontains=keyword)
                _filter.add(q_or, Q.AND)
            qs = qs.filter(_filter).distinct()
        return qs


class CompensationActionCodeAutocomplete(KonovaCodeAutocomplete):
    """
    Due to limitations of the django dal package, we need to subclass for each code list
    """
    def __init__(self, *args, **kwargs):
        self.c = CODELIST_COMPENSATION_ACTION_ID
        super().__init__(*args, **kwargs)


class BiotopeCodeAutocomplete(KonovaCodeAutocomplete):
    """
    Due to limitations of the django dal package, we need to subclass for each code list
    """
    def __init__(self, *args, **kwargs):
        self.c = CODELIST_BIOTOPES_ID
        super().__init__(*args, **kwargs)


class LawCodeAutocomplete(KonovaCodeAutocomplete):
    """
    Due to limitations of the django dal package, we need to subclass for each code list
    """
    def __init__(self, *args, **kwargs):
        self.c = CODELIST_LAW_ID
        super().__init__(*args, **kwargs)


class ProcessTypeCodeAutocomplete(KonovaCodeAutocomplete):
    """
    Due to limitations of the django dal package, we need to subclass for each code list
    """
    def __init__(self, *args, **kwargs):
        self.c = CODELIST_PROCESS_TYPE_ID
        super().__init__(*args, **kwargs)


class RegistrationOfficeCodeAutocomplete(KonovaCodeAutocomplete):
    """
    Due to limitations of the django dal package, we need to subclass for each code list
    """
    def __init__(self, *args, **kwargs):
        self.c = CODELIST_REGISTRATION_OFFICE_ID
        super().__init__(*args, **kwargs)


class ConservationOfficeCodeAutocomplete(KonovaCodeAutocomplete):
    """
    Due to limitations of the django dal package, we need to subclass for each code list
    """
    def __init__(self, *args, **kwargs):
        self.c = CODELIST_CONSERVATION_OFFICE_ID
        super().__init__(*args, **kwargs)