from django.contrib import admin
from django.urls import reverse
from django.utils.html import format_html

from ..models import Destinataer, DestinataerEmailEingang, DestinataerUnterstuetzung


@admin.register(Destinataer)
class DestinataerAdmin(admin.ModelAdmin):
    list_display = [
        "nachname",
        "vorname",
        "familienzweig",
        "berufsgruppe",
        "institution",
        "finanzielle_notlage",
        "aktiv",
    ]
    list_filter = ["familienzweig", "berufsgruppe", "finanzielle_notlage", "aktiv"]
    search_fields = ["nachname", "vorname", "email", "institution", "familienzweig"]
    ordering = ["nachname", "vorname"]
    readonly_fields = ["id"]

    fieldsets = (
        (
            "Persönliche Daten",
            {"fields": ("vorname", "nachname", "geburtsdatum", "email", "telefon")},
        ),
        (
            "Berufliche Informationen",
            {"fields": ("berufsgruppe", "ausbildungsstand", "institution")},
        ),
        (
            "Projekt & Finanzen",
            {
                "fields": (
                    "projekt_beschreibung",
                    "jaehrliches_einkommen",
                    "finanzielle_notlage",
                )
            },
        ),
        (
            "Stiftungsdaten",
            {"fields": ("familienzweig", "iban", "strasse", "plz", "ort")},
        ),
        ("Zusätzlich", {"fields": ("notizen", "aktiv")}),
        ("System", {"fields": ("id",), "classes": ("collapse",)}),
    )

    def iban_display(self, obj):
        if obj.iban:
            return format_html(
                '<span style="font-family: monospace;">{}</span>', obj.iban
            )
        return "-"

    iban_display.short_description = "IBAN"


@admin.register(DestinataerUnterstuetzung)
class DestinataerUnterstuetzungAdmin(admin.ModelAdmin):
    list_display = [
        "__str__",
        "destinataer",
        "betrag",
        "faellig_am",
        "status",
        "wiederkehrend_von",
        "ausgezahlt_am",
    ]
    list_filter = ["status", "faellig_am", "erstellt_am", "konto"]
    search_fields = [
        "destinataer__vorname",
        "destinataer__nachname",
        "beschreibung",
        "empfaenger_name",
    ]
    readonly_fields = ["id", "erstellt_am", "aktualisiert_am"]

    fieldsets = (
        (
            "Grundinformationen",
            {
                "fields": (
                    "destinataer",
                    "konto",
                    "betrag",
                    "faellig_am",
                    "status",
                    "beschreibung",
                )
            },
        ),
        (
            "Überweisungsdaten",
            {"fields": ("empfaenger_iban", "empfaenger_name", "verwendungszweck")},
        ),
        ("Zahlungsinformationen", {"fields": ("ausgezahlt_am", "ausgezahlt_von")}),
        ("Wiederkehrend", {"fields": ("wiederkehrend_von",)}),
        (
            "Metadaten",
            {
                "fields": ("id", "erstellt_am", "aktualisiert_am"),
                "classes": ("collapse",),
            },
        ),
    )


@admin.register(DestinataerEmailEingang)
class DestinataerEmailEingangAdmin(admin.ModelAdmin):
    list_display = [
        "eingangsdatum",
        "absender_email",
        "absender_name",
        "destinataer_link",
        "betreff_kurz",
        "anzahl_anhaenge",
        "status",
        "created_at",
    ]
    list_filter = ["status", "eingangsdatum"]
    search_fields = [
        "absender_email",
        "absender_name",
        "betreff",
        "destinataer__vorname",
        "destinataer__nachname",
    ]
    readonly_fields = ["created_at", "absender_email", "absender_name", "eingangsdatum",
                       "email_text", "paperless_dokument_ids", "fehler_details"]
    raw_id_fields = ["destinataer", "quartalsnachweis"]
    date_hierarchy = "eingangsdatum"
    ordering = ["-eingangsdatum"]

    fieldsets = [
        ("E-Mail-Metadaten", {
            "fields": ["eingangsdatum", "absender_name", "absender_email", "betreff"],
        }),
        ("Zuordnung", {
            "fields": ["destinataer", "status", "quartalsnachweis"],
        }),
        ("Inhalt & Anhänge", {
            "fields": ["email_text", "paperless_dokument_ids"],
        }),
        ("Notizen & Fehler", {
            "fields": ["notizen", "fehler_details"],
            "classes": ["collapse"],
        }),
        ("System", {
            "fields": ["created_at"],
            "classes": ["collapse"],
        }),
    ]

    def destinataer_link(self, obj):
        if obj.destinataer:
            url = reverse("admin:stiftung_destinataer_change", args=[obj.destinataer.pk])
            return format_html('<a href="{}">{}</a>', url, obj.destinataer)
        return format_html('<span style="color:red;">–</span>')
    destinataer_link.short_description = "Destinatär"

    def betreff_kurz(self, obj):
        return (obj.betreff or "")[:60]
    betreff_kurz.short_description = "Betreff"

    def anzahl_anhaenge(self, obj):
        n = len(obj.paperless_dokument_ids or [])
        return n if n else "–"
    anzahl_anhaenge.short_description = "Anhänge"

    actions = ["mark_verarbeitet"]

    def mark_verarbeitet(self, request, queryset):
        updated = queryset.filter(status__in=["neu", "zugewiesen"]).update(status="verarbeitet")
        self.message_user(request, f"{updated} E-Mail(s) als verarbeitet markiert.")
    mark_verarbeitet.short_description = "Als verarbeitet markieren"