from django.contrib import admin
from django.contrib.contenttypes.admin import GenericStackedInline, GenericTabularInline
from django.db.models import Q
from django.contrib.contenttypes.models import ContentType
from django.contrib.auth.models import User as AuthUser
from django.contrib.auth.admin import UserAdmin as AuthUserAdmin
from django.http import HttpResponseRedirect
from django.utils.html import format_html, mark_safe
from django.core.urlresolvers import reverse

from .forms import UserCreationForm
from .models import User, Corporation, Adhesion
from accounts.models import Profile
from services.models import Service
from djadhere.utils import ActiveFilter


### Inlines

class ProfileInline(admin.StackedInline):
    model = Profile

    def has_add_permission(self, request):
        return False

    def has_delete_permission(self, request, obj=None):
        return False


class AdhesionInline(admin.StackedInline):
    model = Adhesion
    fields = ('id', 'notes',)

    def has_add_permission(self, request):
        return False

    def has_delete_permission(self, request, obj=None):
        return False


class ServiceInline(admin.StackedInline):
    model = Service
    extra = 0
    show_change_link = True
    fields = ('service_type', 'label', 'is_active',)
    readonly_fields = ('service_type', 'label', 'is_active',)

    def has_add_permission(self, request):
        return False

    def has_delete_permission(self, request, obj=None):
        return False


### Filters

class AdherentTypeFilter(admin.SimpleListFilter):
    title = 'type d’adhérent'
    parameter_name = 'type'

    def lookups(self, request, model_admin):
        return (
            ('physique', 'Personne physique'),
            ('morale', 'Personne morale'),
        )

    def queryset(self, request, queryset):
        if self.value() == 'physique':
            return queryset.filter(user__isnull=False)
        if self.value() == 'morale':
            return queryset.filter(corporation__isnull=False)


### Mixins

class AdtSearchMixin:
    adhesion_search_field = 'id'

    def get_search_results(self, request, queryset, search_term):
        queryset, use_distinct = super().get_search_results(request, queryset, search_term)
        if search_term[:3] == 'ADT':
            try:
                adh_id = int(search_term[3:])
            except ValueError:
                pass
            else:
                queryset |= self.model.objects.filter(**{self.adhesion_search_field: adh_id})
        return queryset, use_distinct


### ModelAdmin

class UserAdmin(AdtSearchMixin, AuthUserAdmin):
    list_display = AuthUserAdmin.list_display + ('get_adhesion_link',)
    list_select_related = ('profile', 'adhesion',)
    ordering = ('adhesion__id',)
    search_fields = AuthUserAdmin.search_fields \
                        + ('profile__phone_number', 'profile__address', 'profile__notes',) \
                        + ('=adhesion__id', 'adhesion__notes',)
    readonly_fields = ('get_adhesion_link',)
    adhesion_search_field = 'adhesion__id'

    def get_adhesion_id(self, user):
        return user.adhesion
    get_adhesion_id.short_description = 'Numéro d’adhérent'
    get_adhesion_id.admin_order_field = 'adhesion__id'

    get_adhesion_link = lambda self, corporation: corporation.adhesion.get_adhesion_link()
    get_adhesion_link.short_description = Adhesion.get_adhesion_link.short_description

    def get_inline_instances(self, request, obj=None):
        if obj:
            inlines = (ProfileInline, AdhesionInline,)
        else:
            inlines = ()
        return [inline(self.model, self.admin_site) for inline in inlines]

    def get_form(self, request, obj=None, **kwargs):
        if obj:
            return super().get_form(request, obj, **kwargs)
        else:
            return UserCreationForm

    def get_fieldsets(self, request, obj=None):
        if obj:
            fieldsets = (
                (AuthUserAdmin.fieldsets[1][0], {
                    'fields': ('get_adhesion_link',) + AuthUserAdmin.fieldsets[1][1]['fields'],
                }),
                ('Nom d’utilisateur et mot de passe', {
                    'classes': ('collapse',),
                    'fields': AuthUserAdmin.fieldsets[0][1]['fields'],
                }),
                (AuthUserAdmin.fieldsets[2][0], {
                    'classes': ('collapse',),
                    'fields': ('is_active', 'is_staff', 'is_superuser', 'groups',), # removing user_permissions
                }),
                (AuthUserAdmin.fieldsets[3][0], {
                    'classes': ('collapse',),
                    'fields': AuthUserAdmin.fieldsets[3][1]['fields'],
                }),
            )
        else:
            fieldsets = (
                (None, {
                    'fields': ('first_name', 'last_name', 'username', 'email',),
                }),
            )
        return fieldsets

    def get_actions(self, request):
        actions = super().get_actions(request)
        if 'delete_selected' in actions:
            del actions['delete_selected']
        return actions

    def has_delete_permission(self, request, obj=None):
        return obj and not obj.adhesion


class CorporationAdmin(AdtSearchMixin, admin.ModelAdmin):
    list_display = ('social_reason', 'get_adhesion_link',)
    list_select_related = ('adhesion',)
    ordering = ('adhesion__id',)
    search_fields = ('social_reason', 'description', 'email', 'phone_number', 'address', 'notes', 'adhesion__id', 'adhesion__notes',)
    readonly_fields = ('get_adhesion_link',)
    filter_horizontal = ('members',)
    adhesion_search_field = 'adhesion__id'

    def get_adhesion_id(self, corp):
        return corp.adhesion
    get_adhesion_id.short_description = 'Numéro d’adhérent'
    get_adhesion_id.admin_order_field = 'adhesion__id'

    get_adhesion_link = lambda self, corporation: corporation.adhesion.get_adhesion_link()
    get_adhesion_link.short_description = Adhesion.get_adhesion_link.short_description

    def get_inline_instances(self, request, obj=None):
        if obj:
            inlines = (AdhesionInline,)
        else:
            inlines = ()
        return [inline(self.model, self.admin_site) for inline in inlines]

    def get_actions(self, request):
        actions = super().get_actions(request)
        if 'delete_selected' in actions:
            del actions['delete_selected']
        return actions

    def get_fieldsets(self, request, obj=None):
        fieldsets = super().get_fieldsets(request, obj)
        # put adhesion id on top
        if obj:
            fields = fieldsets[0][1]['fields']
            fields.remove('get_adhesion_link')
            fieldsets = (
                (None, {
                    'fields': ['get_adhesion_link'] + fields,
                }),
            )
        return fieldsets

    def has_delete_permission(self, request, obj=None):
        return False


class AdhesionAdmin(AdtSearchMixin, admin.ModelAdmin):
    list_display = ('get_id', 'type', 'get_adherent_link', 'is_active')
    list_filter = (AdherentTypeFilter, ActiveFilter)
    list_select_related = ('user', 'user__profile', 'corporation',)
    fields = ('id', 'type', 'get_adherent_link', 'get_membership_link', 'get_antennas_link',)
    readonly_fields = ('id', 'type', 'get_adherent_link', 'get_membership_link', 'get_antennas_link',)
    search_fields = ('=id', 'notes',) \
                    + tuple(['user__%s' % f for f in UserAdmin.search_fields if 'adhesion' not in f]) \
                    + tuple(['corporation__%s' % f for f in CorporationAdmin.search_fields if 'adhesion' not in f])
    inlines = (ServiceInline,)

    def get_id(self, obj):
        return 'ADT%d' % obj.id
    get_id.short_description = 'Numéro d’adhérent'
    get_id.admin_order_field = 'id'

    def get_membership_link(self, obj):
        return format_html(u'<a href="{}">{}</a>', obj.membership.get_absolute_url(), obj.membership)
    get_membership_link.short_description = 'Cotisation'

    def get_antennas_link(self, obj):
        return mark_safe('<br />'.join(map(lambda antenna: antenna.get_absolute_link(), obj.antenna_set.all())))
    get_antennas_link.short_description = 'Antennes'

    def get_actions(self, request):
        actions = super().get_actions(request)
        if 'delete_selected' in actions:
            del actions['delete_selected']
        return actions

    def has_add_permission(self, request):
        return False

    def has_delete_permission(self, request, obj=None):
        return False


admin.site.unregister(AuthUser)
admin.site.register(User, UserAdmin)
admin.site.register(Corporation, CorporationAdmin)
admin.site.register(Adhesion, AdhesionAdmin)