from django.contrib import admin
from django.utils import timezone

from .models import (
    Bareme, Entreprise, Client, Facture, LigneFacture, Depense, Paiement, Categorie,
)


class ScopedAdmin(admin.ModelAdmin):
    """Cloisonne les données par entreprise pour les non-superadmins."""
    scope_path = "entreprise"

    def get_queryset(self, request):
        qs = super().get_queryset(request)
        if request.user.is_superuser:
            return qs
        return qs.filter(**{f"{self.scope_path}__in": Entreprise.accessibles(request.user)})

    def formfield_for_foreignkey(self, db_field, request, **kwargs):
        if not request.user.is_superuser:
            acc = Entreprise.accessibles(request.user)
            if db_field.name == "entreprise":
                kwargs["queryset"] = acc
            elif db_field.name == "client":
                kwargs["queryset"] = Client.objects.filter(entreprise__in=acc)
            elif db_field.name == "paiement":
                kwargs["queryset"] = Paiement.objects.filter(entreprise__in=acc)
        return super().formfield_for_foreignkey(db_field, request, **kwargs)


# ----- Référentiels mutualisés (visibles par tous) -----

@admin.register(Categorie)
class CategorieAdmin(admin.ModelAdmin):
    list_display = ("nom", "usage", "exclure_calculs", "actif", "ordre")
    list_filter = ("usage", "exclure_calculs", "actif")
    list_editable = ("usage", "exclure_calculs", "actif", "ordre")
    search_fields = ("nom",)


@admin.register(Bareme)
class BaremeAdmin(admin.ModelAdmin):
    list_display = ("annee", "activite", "taux_urssaf", "abattement_fiscal",
                    "taux_vl", "seuil_ca", "seuil_tva_base")
    list_filter = ("annee", "activite")


# ----- Entreprise (accès) -----

@admin.register(Entreprise)
class EntrepriseAdmin(admin.ModelAdmin):
    list_display = ("nom", "activite", "franchise_tva", "versement_liberatoire",
                    "num_tva_intracom", "vue_tva", "email")
    list_filter = ("activite", "franchise_tva", "versement_liberatoire")
    search_fields = ("nom", "siret", "num_tva_intracom")
    filter_horizontal = ("utilisateurs", "groupes")

    def get_queryset(self, request):
        qs = super().get_queryset(request)
        if request.user.is_superuser:
            return qs
        return Entreprise.accessibles(request.user)

    def get_readonly_fields(self, request, obj=None):
        # Seul un superadmin gère les droits d'accès.
        if not request.user.is_superuser:
            return ("utilisateurs", "groupes")
        return ()


# ----- Données cloisonnées par entreprise -----

@admin.register(Client)
class ClientAdmin(ScopedAdmin):
    list_display = ("nom", "entreprise", "email", "siret")
    list_filter = ("entreprise",)
    search_fields = ("nom", "email", "siret")


class LigneFactureInline(admin.TabularInline):
    model = LigneFacture
    extra = 1


@admin.action(description="Marquer comme encaissée (aujourd'hui)")
def marquer_encaissee(modeladmin, request, queryset):
    queryset.update(statut="encaissee", date_encaissement=timezone.now().date())


@admin.register(Facture)
class FactureAdmin(ScopedAdmin):
    list_display = ("numero", "entreprise", "client", "date_emission",
                    "date_encaissement", "statut", "montant_ht", "montant_tva", "montant_ttc")
    list_filter = ("entreprise", "statut", "activite", "date_emission")
    search_fields = ("numero", "client__nom")
    date_hierarchy = "date_emission"
    inlines = [LigneFactureInline]
    actions = [marquer_encaissee]
    readonly_fields = ("montant_ht", "montant_tva", "montant_ttc")

    def save_related(self, request, form, formsets, change):
        super().save_related(request, form, formsets, change)
        form.instance.recompute_totaux()


class DepenseInline(admin.TabularInline):
    model = Depense
    extra = 0
    fields = ("date", "libelle", "categorie", "activite", "regime_tva",
              "taux_tva", "montant_ttc", "montant_tva")


@admin.register(Paiement)
class PaiementAdmin(ScopedAdmin):
    list_display = ("date", "entreprise", "libelle", "sens", "montant_total",
                    "reparti", "reste", "equilibre")
    list_filter = ("entreprise", "sens", "date")
    search_fields = ("libelle",)
    date_hierarchy = "date"
    inlines = [DepenseInline]

    @admin.display(description="Réparti")
    def reparti(self, obj):
        return obj.reparti

    @admin.display(description="Reste")
    def reste(self, obj):
        return obj.reste

    @admin.display(boolean=True, description="Équilibré")
    def equilibre(self, obj):
        return obj.equilibre


@admin.register(Depense)
class DepenseAdmin(ScopedAdmin):
    list_display = ("date", "entreprise", "libelle", "categorie", "activite",
                    "regime_tva", "montant_ttc", "montant_tva", "tva_autoliq", "paiement")
    list_filter = ("entreprise", "categorie", "regime_tva", "activite", "date")
    search_fields = ("libelle",)
    date_hierarchy = "date"

    @admin.display(description="TVA auto-liquidée")
    def tva_autoliq(self, obj):
        return obj.tva_autoliquidee