from django.contrib import admin
from django.db.models import Count, Sum
from django.urls import reverse
from django.utils.html import format_html
from django.utils.safestring import mark_safe

from . import models
from .models import (AppConfiguration, AuditLog, BackupJob, BankTransaction,
                     CSVImport, Destinataer, DestinataerUnterstuetzung,
                     DokumentLink, Foerderung, Land, Paechter, Person,
                     Rentmeister, StiftungsKonto, UnterstuetzungWiederkehrend,
                     Verwaltungskosten)


@admin.register(CSVImport)
class CSVImportAdmin(admin.ModelAdmin):
    list_display = [
        "import_type",
        "filename",
        "status",
        "total_rows",
        "imported_rows",
        "failed_rows",
        "created_by",
        "started_at",
        "duration_display",
    ]
    list_filter = ["import_type", "status", "started_at"]
    search_fields = ["filename", "created_by"]
    readonly_fields = ["id", "started_at", "completed_at", "get_success_rate"]
    ordering = ["-started_at"]

    fieldsets = (
        (
            "Grundinformationen",
            {"fields": ("import_type", "filename", "file_size", "status")},
        ),
        (
            "Ergebnisse",
            {
                "fields": (
                    "total_rows",
                    "imported_rows",
                    "failed_rows",
                    "get_success_rate",
                    "error_log",
                )
            },
        ),
        ("Metadaten", {"fields": ("created_by", "started_at", "completed_at")}),
    )

    def duration_display(self, obj):
        duration = obj.get_duration()
        if duration:
            return f"{duration.total_seconds():.1f}s"
        return "-"

    duration_display.short_description = "Dauer"

    def get_success_rate(self, obj):
        rate = obj.get_success_rate()
        if rate >= 90:
            color = "success"
        elif rate >= 70:
            color = "warning"
        else:
            color = "danger"
        return format_html('<span class="badge bg-{}">{:.1f}%</span>', color, rate)

    get_success_rate.short_description = "Erfolgsrate"


@admin.register(Person)
class PersonAdmin(admin.ModelAdmin):
    list_display = [
        "nachname",
        "vorname",
        "familienzweig",
        "geburtsdatum",
        "email",
        "iban_display",
    ]
    list_filter = ["familienzweig", "geburtsdatum"]
    search_fields = ["nachname", "vorname", "email", "familienzweig"]
    ordering = ["nachname", "vorname"]
    readonly_fields = ["id"]

    fieldsets = (
        (
            "Persönliche Daten",
            {"fields": ("vorname", "nachname", "geburtsdatum", "email", "telefon")},
        ),
        ("Stiftungsdaten", {"fields": ("familienzweig", "iban", "adresse")}),
        ("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"

    def get_queryset(self, request):
        return (
            super()
            .get_queryset(request)
            .annotate(total_foerderungen=Sum("foerderung__betrag"))
        )


@admin.register(Paechter)
class PaechterAdmin(admin.ModelAdmin):
    list_display = [
        "nachname",
        "vorname",
        "pachtnummer",
        "pachtzins_aktuell",
        "landwirtschaftliche_ausbildung",
        "aktiv",
    ]
    list_filter = ["landwirtschaftliche_ausbildung", "aktiv"]
    search_fields = ["nachname", "vorname", "email", "pachtnummer"]
    ordering = ["nachname", "vorname"]
    readonly_fields = ["id"]

    fieldsets = (
        (
            "Persönliche Daten",
            {"fields": ("vorname", "nachname", "geburtsdatum", "email", "telefon")},
        ),
        (
            "Pacht-Informationen",
            {
                "fields": (
                    "pachtnummer",
                    "pachtbeginn_erste",
                    "pachtende_letzte",
                    "pachtzins_aktuell",
                )
            },
        ),
        (
            "Landwirtschaftliche Qualifikation",
            {
                "fields": (
                    "landwirtschaftliche_ausbildung",
                    "berufserfahrung_jahre",
                    "spezialisierung",
                )
            },
        ),
        ("Kontaktdaten", {"fields": ("iban", "strasse", "plz", "ort")}),
        ("Pächter-Typ", {"fields": ("personentyp",)}),
        ("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(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(Land)
class LandAdmin(admin.ModelAdmin):
    list_display = [
        "lfd_nr",
        "gemeinde",
        "gemarkung",
        "flur",
        "flurstueck",
        "groesse_qm",
        "verp_flaeche_aktuell",
        "verpachtungsgrad_display",
        "aktiv",
    ]
    list_filter = ["gemeinde", "gemarkung", "aktiv"]
    search_fields = ["lfd_nr", "gemeinde", "gemarkung", "flur", "flurstueck"]
    ordering = ["gemeinde", "gemarkung", "flur", "flurstueck"]
    readonly_fields = ["id", "gesamtflaeche_berechnet", "verpachtungsgrad_berechnet"]

    fieldsets = (
        ("Identifikation", {"fields": ("lfd_nr", "ew_nummer")}),
        ("Gerichtliche Zuständigkeit", {"fields": ("amtsgericht",)}),
        (
            "Verwaltungsstruktur",
            {"fields": ("gemeinde", "gemarkung", "flur", "flurstueck")},
        ),
        (
            "Flächenangaben",
            {
                "fields": (
                    "groesse_qm",
                    "gruenland_qm",
                    "acker_qm",
                    "wald_qm",
                    "sonstiges_qm",
                )
            },
        ),
        (
            "Verpachtung",
            {
                "fields": (
                    "verpachtete_gesamtflaeche",
                    "flaeche_alte_liste",
                    "verp_flaeche_aktuell",
                )
            },
        ),
        ("Steuern und Abgaben", {"fields": ("anteil_grundsteuer", "anteil_lwk")}),
        ("Status", {"fields": ("aktiv", "notizen")}),
        (
            "System",
            {
                "fields": ("id", "erstellt_am", "aktualisiert_am"),
                "classes": ("collapse",),
            },
        ),
    )

    def verpachtungsgrad_display(self, obj):
        grad = obj.get_verpachtungsgrad()
        if grad > 90:
            color = "green"
        elif grad > 70:
            color = "orange"
        else:
            color = "red"
        return format_html('<span style="color: {};">{:.1f}%</span>', color, grad)

    verpachtungsgrad_display.short_description = "Verpachtungsgrad"

    def gesamtflaeche_berechnet(self, obj):
        return f"{obj.get_gesamtflaeche():.2f} qm"

    gesamtflaeche_berechnet.short_description = "Berechnete Gesamtfläche"

    def verpachtungsgrad_berechnet(self, obj):
        return f"{obj.get_verpachtungsgrad():.1f}%"

    verpachtungsgrad_berechnet.short_description = "Verpachtungsgrad"


@admin.register(DokumentLink)
class DokumentLinkAdmin(admin.ModelAdmin):
    list_display = ["titel", "kontext", "paperless_document_id"]
    list_filter = ["kontext"]
    search_fields = ["titel", "kontext"]
    ordering = ["titel"]
    readonly_fields = ["id"]

    fieldsets = (
        (
            "Dokument",
            {"fields": ("titel", "kontext", "paperless_document_id", "beschreibung")},
        ),
        ("System", {"fields": ("id",), "classes": ("collapse",)}),
    )


@admin.register(Foerderung)
class FoerderungAdmin(admin.ModelAdmin):
    list_display = [
        "destinataer",
        "jahr",
        "betrag",
        "verwendungsnachweis_link",
        "total_for_destinataer",
    ]
    list_filter = ["jahr", "destinataer__familienzweig"]
    search_fields = [
        "destinataer__nachname",
        "destinataer__vorname",
        "destinataer__familienzweig",
    ]
    ordering = ["-jahr", "-betrag"]
    readonly_fields = ["id"]

    fieldsets = (
        (
            "Förderung",
            {
                "fields": (
                    "destinataer",
                    "person",
                    "jahr",
                    "betrag",
                    "kategorie",
                    "status",
                )
            },
        ),
        ("Dokumentation", {"fields": ("verwendungsnachweis", "bemerkungen")}),
        ("Daten", {"fields": ("antragsdatum", "entscheidungsdatum")}),
        ("System", {"fields": ("id",), "classes": ("collapse",)}),
    )

    def verwendungsnachweis_link(self, obj):
        if obj.verwendungsnachweis:
            return format_html(
                '<a href="{}">{}</a>',
                reverse(
                    "admin:stiftung_dokumentlink_change",
                    args=[obj.verwendungsnachweis.id],
                ),
                obj.verwendungsnachweis.titel,
            )
        return "-"

    verwendungsnachweis_link.short_description = "Verwendungsnachweis"

    def total_for_destinataer(self, obj):
        total = (
            Foerderung.objects.filter(destinataer=obj.destinataer).aggregate(
                Sum("betrag")
            )["betrag__sum"]
            or 0
        )
        return f"€{total:,.2f}"

    total_for_destinataer.short_description = "Gesamt für Destinatär"


@admin.register(Rentmeister)
class RentmeisterAdmin(admin.ModelAdmin):
    list_display = [
        "__str__",
        "email",
        "telefon",
        "seit_datum",
        "bis_datum",
        "aktiv",
        "monatliche_verguetung",
    ]
    list_filter = ["aktiv", "seit_datum", "anrede"]
    search_fields = ["vorname", "nachname", "email", "telefon", "ort"]
    ordering = ["nachname", "vorname"]
    readonly_fields = ["id", "erstellt_am", "aktualisiert_am"]

    fieldsets = (
        ("Persönliche Daten", {"fields": ("anrede", "vorname", "nachname", "titel")}),
        (
            "Kontaktdaten",
            {"fields": ("email", "telefon", "mobil", "strasse", "plz", "ort")},
        ),
        (
            "Bankdaten",
            {"fields": ("iban", "bic", "bank_name"), "classes": ["collapse"]},
        ),
        (
            "Stiftungsdaten",
            {
                "fields": (
                    "seit_datum",
                    "bis_datum",
                    "aktiv",
                    "monatliche_verguetung",
                    "km_pauschale",
                )
            },
        ),
        (
            "Zusätzliche Informationen",
            {"fields": ("notizen",), "classes": ["collapse"]},
        ),
        (
            "System",
            {
                "fields": ("id", "erstellt_am", "aktualisiert_am"),
                "classes": ["collapse"],
            },
        ),
    )


@admin.register(StiftungsKonto)
class StiftungsKontoAdmin(admin.ModelAdmin):
    list_display = [
        "kontoname",
        "bank_name",
        "konto_typ",
        "saldo",
        "saldo_datum",
        "aktiv",
    ]
    list_filter = ["konto_typ", "aktiv", "bank_name"]
    search_fields = ["kontoname", "bank_name", "iban"]
    ordering = ["bank_name", "kontoname"]
    readonly_fields = ["id", "erstellt_am", "aktualisiert_am"]

    fieldsets = (
        (
            "Kontodaten",
            {"fields": ("kontoname", "bank_name", "iban", "bic", "konto_typ")},
        ),
        (
            "Finanzdaten",
            {"fields": ("saldo", "saldo_datum", "zinssatz", "laufzeit_bis")},
        ),
        ("Status", {"fields": ("aktiv", "notizen")}),
        (
            "System",
            {
                "fields": ("id", "erstellt_am", "aktualisiert_am"),
                "classes": ["collapse"],
            },
        ),
    )


@admin.register(Verwaltungskosten)
class VerwaltungskostenAdmin(admin.ModelAdmin):
    list_display = [
        "bezeichnung",
        "kategorie",
        "betrag",
        "datum",
        "status",
        "rentmeister",
        "konto",
    ]
    list_filter = ["kategorie", "status", "datum", "rentmeister", "konto"]
    search_fields = [
        "bezeichnung",
        "lieferant_firma",
        "rechnungsnummer",
        "beschreibung",
    ]
    ordering = ["-datum", "-erstellt_am"]
    readonly_fields = ["id", "erstellt_am", "aktualisiert_am"]
    date_hierarchy = "datum"

    fieldsets = (
        (
            "Grunddaten",
            {"fields": ("bezeichnung", "kategorie", "betrag", "datum", "status")},
        ),
        ("Zuordnung", {"fields": ("rentmeister", "konto")}),
        (
            "Lieferant/Rechnung",
            {"fields": ("lieferant_firma", "rechnungsnummer"), "classes": ["collapse"]},
        ),
        (
            "Fahrtkosten",
            {
                "fields": ("km_anzahl", "km_satz", "von_ort", "nach_ort", "zweck"),
                "classes": ["collapse"],
                "description": 'Nur für Kategorie "Fahrtkosten" relevant',
            },
        ),
        (
            "Zusätzliche Informationen",
            {"fields": ("beschreibung", "notizen"), "classes": ["collapse"]},
        ),
        (
            "System",
            {
                "fields": ("id", "erstellt_am", "aktualisiert_am"),
                "classes": ["collapse"],
            },
        ),
    )


@admin.register(BankTransaction)
class BankTransactionAdmin(admin.ModelAdmin):
    list_display = [
        "datum",
        "konto",
        "betrag",
        "empfaenger_zahlungspflichtiger",
        "transaction_type",
        "status",
        "verwaltungskosten",
    ]
    list_filter = ["konto", "transaction_type", "status", "datum", "importiert_am"]
    search_fields = ["verwendungszweck", "empfaenger_zahlungspflichtiger", "referenz"]
    readonly_fields = ["importiert_am", "import_datei"]
    ordering = ["-datum", "-importiert_am"]

    fieldsets = (
        ("Basisdaten", {"fields": ("konto", "datum", "valuta", "betrag", "waehrung")}),
        (
            "Transaktionsdetails",
            {
                "fields": (
                    "verwendungszweck",
                    "empfaenger_zahlungspflichtiger",
                    "iban_gegenpartei",
                    "bic_gegenpartei",
                    "referenz",
                    "transaction_type",
                )
            },
        ),
        ("Verwaltung", {"fields": ("status", "kommentare", "verwaltungskosten")}),
        (
            "Import-Information",
            {
                "fields": ("import_datei", "importiert_am", "saldo_nach_buchung"),
                "classes": ("collapse",),
            },
        ),
    )

    def get_queryset(self, request):
        return (
            super().get_queryset(request).select_related("konto", "verwaltungskosten")
        )


@admin.register(AuditLog)
class AuditLogAdmin(admin.ModelAdmin):
    list_display = [
        "timestamp",
        "username",
        "action",
        "entity_type",
        "entity_name",
        "ip_address",
    ]
    list_filter = ["action", "entity_type", "timestamp", "username"]
    search_fields = ["username", "entity_name", "description", "ip_address"]
    readonly_fields = [
        "id",
        "timestamp",
        "user",
        "username",
        "action",
        "entity_type",
        "entity_id",
        "entity_name",
        "description",
        "changes",
        "ip_address",
        "user_agent",
        "session_key",
    ]
    ordering = ["-timestamp"]
    date_hierarchy = "timestamp"

    fieldsets = (
        (
            "Benutzer und Zeit",
            {"fields": ("timestamp", "user", "username", "session_key")},
        ),
        (
            "Aktion",
            {
                "fields": (
                    "action",
                    "entity_type",
                    "entity_id",
                    "entity_name",
                    "description",
                )
            },
        ),
        ("Änderungsdetails", {"fields": ("changes",), "classes": ["collapse"]}),
        (
            "Request-Informationen",
            {"fields": ("ip_address", "user_agent"), "classes": ["collapse"]},
        ),
        ("System", {"fields": ("id",), "classes": ["collapse"]}),
    )

    def has_add_permission(self, request):
        return False  # Don't allow manual creation

    def has_change_permission(self, request, obj=None):
        return False  # Don't allow editing


@admin.register(BackupJob)
class BackupJobAdmin(admin.ModelAdmin):
    list_display = [
        "created_at",
        "backup_type",
        "status",
        "backup_size_display",
        "duration_display",
        "created_by",
    ]
    list_filter = ["backup_type", "status", "created_at"]
    search_fields = ["backup_filename", "created_by__username"]
    readonly_fields = [
        "id",
        "created_at",
        "started_at",
        "completed_at",
        "backup_size",
        "get_duration",
    ]
    ordering = ["-created_at"]

    fieldsets = (
        ("Job-Details", {"fields": ("backup_type", "status", "created_by")}),
        (
            "Zeitpunkte",
            {"fields": ("created_at", "started_at", "completed_at", "get_duration")},
        ),
        (
            "Ergebnis",
            {
                "fields": (
                    "backup_filename",
                    "backup_size",
                    "database_size",
                    "files_count",
                )
            },
        ),
        ("Fehlerbehandlung", {"fields": ("error_message",), "classes": ["collapse"]}),
        ("System", {"fields": ("id",), "classes": ["collapse"]}),
    )

    def backup_size_display(self, obj):
        return obj.get_size_display()

    backup_size_display.short_description = "Backup-Größe"

    def duration_display(self, obj):
        duration = obj.get_duration()
        if duration:
            return f"{duration.total_seconds():.1f}s"
        return "-"

    duration_display.short_description = "Dauer"

    def has_add_permission(self, request):
        return False  # Use the web interface for creating backups


@admin.register(AppConfiguration)
class AppConfigurationAdmin(admin.ModelAdmin):
    list_display = [
        "display_name",
        "key",
        "value_display",
        "category",
        "setting_type",
        "is_active",
        "updated_at",
    ]
    list_filter = ["category", "setting_type", "is_active"]
    search_fields = ["key", "display_name", "description"]
    readonly_fields = ["id", "created_at", "updated_at"]
    ordering = ["category", "order", "display_name"]

    fieldsets = (
        (
            "Basic Information",
            {
                "fields": (
                    "key",
                    "display_name",
                    "description",
                    "category",
                    "setting_type",
                )
            },
        ),
        ("Value Configuration", {"fields": ("value", "default_value")}),
        ("Options", {"fields": ("is_active", "is_system", "order")}),
        (
            "Metadata",
            {"fields": ("created_at", "updated_at"), "classes": ("collapse",)},
        ),
    )

    def value_display(self, obj):
        """Display value with type formatting"""
        value = obj.value
        if obj.setting_type == "boolean":
            icon = "✅" if obj.get_typed_value() else "❌"
            return format_html("{} {}", icon, value)
        elif obj.setting_type == "url":
            return format_html(
                '<a href="{}" target="_blank">{}</a>',
                value,
                value[:50] + "..." if len(value) > 50 else value,
            )
        elif len(value) > 100:
            return value[:100] + "..."
        return value

    value_display.short_description = "Current Value"

    def get_readonly_fields(self, request, obj=None):
        readonly = list(self.readonly_fields)
        if obj and obj.is_system:
            readonly.extend(["key", "setting_type", "is_system"])
        return readonly


@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(UnterstuetzungWiederkehrend)
class UnterstuetzungWiederkehrendAdmin(admin.ModelAdmin):
    list_display = [
        "__str__",
        "destinataer",
        "betrag",
        "intervall",
        "aktiv",
        "naechste_generierung",
    ]
    list_filter = ["intervall", "aktiv", "erstellt_am"]
    search_fields = [
        "destinataer__vorname",
        "destinataer__nachname",
        "beschreibung",
        "empfaenger_name",
    ]
    readonly_fields = ["id", "erstellt_am"]

    fieldsets = (
        (
            "Grundinformationen",
            {
                "fields": (
                    "destinataer",
                    "konto",
                    "betrag",
                    "intervall",
                    "beschreibung",
                    "aktiv",
                )
            },
        ),
        (
            "Überweisungsdaten",
            {"fields": ("empfaenger_iban", "empfaenger_name", "verwendungszweck")},
        ),
        (
            "Zeitplanung",
            {
                "fields": (
                    "erste_zahlung_am",
                    "letzte_zahlung_am",
                    "naechste_generierung",
                )
            },
        ),
        (
            "Metadaten",
            {"fields": ("id", "erstellt_von", "erstellt_am"), "classes": ("collapse",)},
        ),
    )


@admin.register(models.HelpBox)
class HelpBoxAdmin(admin.ModelAdmin):
    list_display = [
        "get_page_display",
        "title",
        "is_active",
        "updated_at",
        "updated_by",
    ]
    list_filter = ["page_key", "is_active", "updated_at"]
    search_fields = ["title", "content"]

    fieldsets = (
        ("Grundinformationen", {"fields": ("page_key", "title", "is_active")}),
        (
            "Inhalt",
            {
                "fields": ("content",),
                "description": "Markdown wird unterstützt: **fett**, *kursiv*, `code`, [Link](url), Listen mit - oder 1.",
            },
        ),
        (
            "Metadaten",
            {
                "fields": ("created_at", "updated_at", "created_by", "updated_by"),
                "classes": ("collapse",),
            },
        ),
    )

    readonly_fields = ["created_at", "updated_at"]

    def get_page_display(self, obj):
        return obj.get_page_key_display()

    get_page_display.short_description = "Seite"

    def save_model(self, request, obj, form, change):
        if not change:  # Neues Objekt
            obj.created_by = request.user.username
        obj.updated_by = request.user.username
        super().save_model(request, obj, form, change)


# Customize admin site
admin.site.site_header = "Stiftungsverwaltung Administration"
admin.site.site_title = "Stiftungsverwaltung Admin"
admin.site.index_title = "Willkommen zur Stiftungsverwaltung"