Plugin_SN_Basis/ui/tabs/print_tab.py

"""
sn_basis/ui/tabs/print_tab.py - Zentraler Druck-Tab für sn-Plugins.
"""
from __future__ import annotations

from typing import Any, Optional

from sn_basis.functions.qt_wrapper import (
    QWidget,
    QVBoxLayout,
    QLabel,
    QComboBox,
    QCheckBox,
    QHBoxLayout,
    QPushButton,
    QToolButton,
    ToolButtonTextBesideIcon,
    ArrowDown,
    ArrowRight,
)
from sn_basis.functions.qgiscore_wrapper import QgsProject, QgsMapLayerProxyModel
from sn_basis.functions.qgisui_wrapper import iface, QgsMapLayerComboBox
from sn_basis.functions.variable_wrapper import get_variable, set_variable
from sn_basis.modules.Pruefmanager import Pruefmanager
from sn_basis.modules.DataGrabber import DataGrabber
from sn_basis.modules.print_logic import (
    PrintLogic,
    MASSSTAB_WIE_KARTENFENSTER,
    PLOTMASSSTAB_BY_AUSWAHL,
    THEMA_WIE_KARTENFENSTER,
    DIN_GROESSEN,
    DIN_STANDARD,
    DRUCKBEREICH_VAR,
    DRUCKPUFFER_VAR,
    DRUCKPUFFER_STANDARD_CM,
    DRUCKBEREICH_VERFAHRENSGEBIET,
    DRUCKBEREICH_WIE_KARTENFENSTER,
    DRUCKBEREICH_AKTUELLE_AUSWAHL,
    DRUCKBEREICH_RECHTECK,
)


KARTENNAME_VAR = "tab_b_kartenname"
KARTENNAME_PLACEHOLDER = "Kartenname wählen"
KARTENNAME_38 = "§38"
KARTENNAME_41 = "§41"
KARTENNAME_BAUFREIGABE = "Anlage zur Baufreigabe"
MASSSTAB_VAR = "tab_b_massstab"
THEMA_VAR = "tab_b_thema"
ZIELGROESSE_UI_VAR = "tab_b_zielgroesse"
FORMFAKTOR_UI_VAR = "tab_b_formfaktor"
ATLAS_ERZEUGEN_VAR = "tab_b_atlas_erzeugen"
DRUCKBEREICH_OPTIONEN = [
    DRUCKBEREICH_VERFAHRENSGEBIET,
    DRUCKBEREICH_WIE_KARTENFENSTER,
    DRUCKBEREICH_AKTUELLE_AUSWAHL,
    DRUCKBEREICH_RECHTECK,
]


class PrintTab(QWidget):
    """UI-Klasse für den zentralen Druck-Tab."""

    tab_title = "Druck"

    def __init__(self, parent: Optional[Any] = None):
        super().__init__(parent)
        self.pruefmanager: Optional[Pruefmanager] = None
        self.logic = PrintLogic(self.pruefmanager)

        
        #self.logic: Optional[PrintLogic] = None
        self._kartenname_combo: Optional[Any] = None
        self._massstab_combo: Optional[Any] = None
        self._thema_combo: Optional[Any] = None
        self._theme_signal_connected = False
        self._connected_theme_collection: object = None
        self._zielgroesse_combo: Optional[Any] = None
        self._druckbereich_combo: Optional[Any] = None
        self._endlosrolle_cb: Optional[Any] = None
        self._druckpuffer_button: Optional[Any] = None
        self._btn_vorlage_erstellen: Optional[Any] = None
        self._atlas_layer_combo: Optional[Any] = None
        self._btn_auswahl_as_atlas: Optional[Any] = None
        self._atlas_erzeugen_cb: Optional[Any] = None
        self._atlas_button: Optional[Any] = None
        self._atlas_content: Optional[Any] = None

        self._build_ui()
        self._restore_state()
        self._connect_theme_collection_signals()
        self._connect_project_signals()

    def set_services(self, pruefmanager: Pruefmanager, data_grabber: DataGrabber) -> None:
        _ = data_grabber
        self.pruefmanager = pruefmanager
        self.logic = PrintLogic(pruefmanager=self.pruefmanager)

        if self._kartenname_combo:
            self.logic.set_kartenname_for_auswahl(self._kartenname_combo.currentText())
        if self._massstab_combo:
            self.logic.set_plotmassstab_for_auswahl(
                self._massstab_combo.currentText(),
                self._get_current_canvas_scale(),
            )
        if self._thema_combo:
            self.logic.set_view_for_auswahl(self._thema_combo.currentText())
        if self._zielgroesse_combo:
            self.logic.set_zielgroesse_for_auswahl(self._zielgroesse_combo.currentText())
        if self._druckbereich_combo:
            self.logic.set_druckbereich_for_auswahl(self._druckbereich_combo.currentText())
        if self._endlosrolle_cb:
            self.logic.set_formfaktor(self._endlosrolle_cb.isChecked())

    def _build_ui(self) -> None:
        main_layout = QVBoxLayout()
        main_layout.setSpacing(4)
        main_layout.setContentsMargins(4, 4, 4, 4)

        kartenname_label = QLabel("Kartenname")
        kartenname_label.setStyleSheet("font-weight: bold; margin-top: 6px;")
        main_layout.addWidget(kartenname_label)

        kartenname_combo = QComboBox(self)
        kartenname_combo.addItem(KARTENNAME_PLACEHOLDER)
        kartenname_combo.addItem(KARTENNAME_38)
        kartenname_combo.addItem(KARTENNAME_41)
        kartenname_combo.addItem(KARTENNAME_BAUFREIGABE)
        kartenname_combo.currentTextChanged.connect(self._on_kartenname_changed)
        self._kartenname_combo = kartenname_combo
        main_layout.addWidget(kartenname_combo)

        massstab_label = QLabel("Maßstab")
        massstab_label.setStyleSheet("font-weight: bold; margin-top: 6px;")
        main_layout.addWidget(massstab_label)

        massstab_combo = QComboBox(self)
        massstab_combo.addItem(MASSSTAB_WIE_KARTENFENSTER)
        massstab_combo.addItems(list(PLOTMASSSTAB_BY_AUSWAHL.keys()))
        massstab_combo.currentTextChanged.connect(self._on_massstab_changed)
        self._massstab_combo = massstab_combo
        main_layout.addWidget(massstab_combo)

        thema_label = QLabel("Thema")
        thema_label.setStyleSheet("font-weight: bold; margin-top: 6px;")
        main_layout.addWidget(thema_label)

        thema_combo = QComboBox(self)
        thema_combo.addItem(THEMA_WIE_KARTENFENSTER)
        thema_combo.addItems(self._get_gespeicherte_themen())
        thema_combo.currentTextChanged.connect(self._on_thema_changed)
        self._thema_combo = thema_combo
        main_layout.addWidget(thema_combo)

        zielgroesse_label = QLabel("max. Blattgröße")
        zielgroesse_label.setStyleSheet("font-weight: bold; margin-top: 6px;")
        main_layout.addWidget(zielgroesse_label)

        zielgroesse_row = QHBoxLayout()
        zielgroesse_row.setSpacing(6)
        zielgroesse_combo = QComboBox(self)
        zielgroesse_combo.addItems(list(DIN_GROESSEN.keys()))
        zielgroesse_combo.setCurrentText(DIN_STANDARD)
        zielgroesse_combo.currentTextChanged.connect(self._on_zielgroesse_changed)
        self._zielgroesse_combo = zielgroesse_combo
        zielgroesse_row.addWidget(zielgroesse_combo)

        endlosrolle_cb = QCheckBox("Endlosrolle", self)
        endlosrolle_cb.setChecked(False)
        endlosrolle_cb.stateChanged.connect(self._on_formfaktor_changed)
        self._endlosrolle_cb = endlosrolle_cb
        zielgroesse_row.addWidget(endlosrolle_cb)
        main_layout.addLayout(zielgroesse_row)

        druckbereich_row = QHBoxLayout()
        druckbereich_row.setSpacing(6)

        druckbereich_column = QVBoxLayout()
        druckbereich_column.setSpacing(4)
        druckbereich_column.setContentsMargins(0, 0, 0, 0)

        druckbereich_label = QLabel("Druckbereich")
        druckbereich_label.setStyleSheet("font-weight: bold; margin-top: 6px;")
        druckbereich_column.addWidget(druckbereich_label)

        druckbereich_combo = QComboBox(self)
        druckbereich_combo.addItems(DRUCKBEREICH_OPTIONEN)
        druckbereich_combo.currentTextChanged.connect(self._on_druckbereich_changed)
        self._druckbereich_combo = druckbereich_combo
        druckbereich_column.addWidget(druckbereich_combo)
        druckbereich_row.addLayout(druckbereich_column, 1)

        druckpuffer_column = QVBoxLayout()
        druckpuffer_column.setSpacing(4)
        druckpuffer_column.setContentsMargins(0, 0, 0, 0)

        druckpuffer_label = QLabel("Kartenpuffer")
        druckpuffer_label.setStyleSheet("font-weight: bold; margin-top: 6px;")
        druckpuffer_column.addWidget(druckpuffer_label)

        druckpuffer_button = QPushButton(self._format_druckpuffer_label(DRUCKPUFFER_STANDARD_CM), self)
        druckpuffer_button.setToolTip("Puffer")
        druckpuffer_button.clicked.connect(self._on_druckpuffer_clicked)
        self._druckpuffer_button = druckpuffer_button
        druckpuffer_column.addWidget(druckpuffer_button)
        druckbereich_row.addLayout(druckpuffer_column)

        main_layout.addLayout(druckbereich_row)

        # Atlas-Bereich (einklappbar, analog Tab A)
        atlas_button = QToolButton()
        atlas_button.setText("Atlas")
        atlas_button.setCheckable(True)
        atlas_button.setChecked(False)
        atlas_button.setToolButtonStyle(ToolButtonTextBesideIcon)
        atlas_button.setArrowType(ArrowRight)
        atlas_button.setStyleSheet("font-weight: bold; margin-top: 6px;")
        atlas_button.toggled.connect(self._toggle_atlas)
        self._atlas_button = atlas_button
        main_layout.addWidget(atlas_button)

        atlas_content = QWidget()
        atlas_layout = QVBoxLayout()
        atlas_layout.setSpacing(4)
        atlas_layout.setContentsMargins(10, 4, 4, 4)

        atlas_erzeugen_cb = QCheckBox("Atlas erzeugen", self)
        atlas_erzeugen_cb.setChecked(True)
        atlas_erzeugen_cb.stateChanged.connect(self._on_atlas_erzeugen_changed)
        self._atlas_erzeugen_cb = atlas_erzeugen_cb
        atlas_layout.addWidget(atlas_erzeugen_cb)

        atlas_layer_label = QLabel("Abdeckungslayer", self)
        atlas_layout.addWidget(atlas_layer_label)

        atlas_layer_combo = QgsMapLayerComboBox(self)
        set_filters = getattr(atlas_layer_combo, "setFilters", None)
        if callable(set_filters):
            set_filters(QgsMapLayerProxyModel.VectorLayer)
        layer_changed = getattr(atlas_layer_combo, "layerChanged", None)
        if layer_changed is not None:
            try:
                layer_changed.connect(self._on_atlas_layer_changed)
            except Exception:
                pass
        self._atlas_layer_combo = atlas_layer_combo
        atlas_layout.addWidget(atlas_layer_combo)

        btn_auswahl_as_atlas = QPushButton("Auswahl als Atlas anlegen", self)
        btn_auswahl_as_atlas.clicked.connect(self._on_auswahl_as_atlas_clicked)
        self._btn_auswahl_as_atlas = btn_auswahl_as_atlas
        atlas_layout.addWidget(btn_auswahl_as_atlas)

        atlas_content.setLayout(atlas_layout)
        atlas_content.setVisible(False)
        self._atlas_content = atlas_content
        main_layout.addWidget(atlas_content)

        btn_vorlage_erstellen = QPushButton("Vorlage erstellen", self)
        btn_vorlage_erstellen.clicked.connect(self._on_vorlage_erstellen)
        self._btn_vorlage_erstellen = btn_vorlage_erstellen
        main_layout.addWidget(btn_vorlage_erstellen)

        main_layout.addStretch(1)
        self.setLayout(main_layout)

    def _restore_state(self) -> None:
        if not self._kartenname_combo or not self._massstab_combo or not self._thema_combo:
            return
        if not self._zielgroesse_combo or not self._endlosrolle_cb:
            return
        if not self._druckbereich_combo or not self._druckpuffer_button:
            return

        saved_kartenname = get_variable(KARTENNAME_VAR, scope="project")
        if saved_kartenname in (KARTENNAME_38, KARTENNAME_41, KARTENNAME_BAUFREIGABE):
            self._kartenname_combo.setCurrentText(saved_kartenname)
        else:
            self._kartenname_combo.setCurrentText(KARTENNAME_PLACEHOLDER)

        saved_massstab = get_variable(MASSSTAB_VAR, scope="project")
        valid_massstaebe = [MASSSTAB_WIE_KARTENFENSTER, *PLOTMASSSTAB_BY_AUSWAHL.keys()]
        if saved_massstab in valid_massstaebe:
            self._massstab_combo.setCurrentText(saved_massstab)
        else:
            self._massstab_combo.setCurrentText(MASSSTAB_WIE_KARTENFENSTER)

        aktuelle_themen = [THEMA_WIE_KARTENFENSTER, *self._get_gespeicherte_themen()]
        self._thema_combo.clear()
        self._thema_combo.addItems(aktuelle_themen)

        saved_thema = get_variable(THEMA_VAR, scope="project")
        if saved_thema in aktuelle_themen:
            self._thema_combo.setCurrentText(saved_thema)
        else:
            self._thema_combo.setCurrentText(THEMA_WIE_KARTENFENSTER)

        saved_zielgroesse = get_variable(ZIELGROESSE_UI_VAR, scope="project")
        if saved_zielgroesse in DIN_GROESSEN:
            self._zielgroesse_combo.setCurrentText(saved_zielgroesse)
        else:
            self._zielgroesse_combo.setCurrentText(DIN_STANDARD)

        saved_formfaktor = get_variable(FORMFAKTOR_UI_VAR, scope="project")
        self._endlosrolle_cb.setChecked(saved_formfaktor == "Endlosrolle")

        saved_druckbereich = get_variable(DRUCKBEREICH_VAR, scope="project")
        if saved_druckbereich in DRUCKBEREICH_OPTIONEN:
            self._druckbereich_combo.setCurrentText(saved_druckbereich)
        else:
            self._druckbereich_combo.setCurrentText(DRUCKBEREICH_VERFAHRENSGEBIET)

        saved_druckpuffer = get_variable(DRUCKPUFFER_VAR, scope="project")
        try:
            druckpuffer_cm = int(str(saved_druckpuffer).strip())
        except (TypeError, ValueError):
            druckpuffer_cm = DRUCKPUFFER_STANDARD_CM
        self._druckpuffer_button.setText(self._format_druckpuffer_label(max(0, druckpuffer_cm)))

        if self._atlas_erzeugen_cb:
            atlas_raw = get_variable(ATLAS_ERZEUGEN_VAR, scope="project")
            atlas_checked = True if atlas_raw in (None, "") else str(atlas_raw).strip().lower() in {
                "1",
                "true",
                "ja",
                "yes",
                "on",
            }
            self._atlas_erzeugen_cb.setChecked(atlas_checked)
            self._on_atlas_erzeugen_changed(1 if atlas_checked else 0)

        self._restore_atlas_layer_selection()

    def _on_kartenname_changed(self, value: str) -> None:
        if value in (KARTENNAME_38, KARTENNAME_41, KARTENNAME_BAUFREIGABE):
            set_variable(KARTENNAME_VAR, value, scope="project")
        else:
            set_variable(KARTENNAME_VAR, "", scope="project")

        # Atlas-Bereich automatisch ein-/ausklappen je nach Kartenname.
        if self._atlas_button:
            self._atlas_button.setChecked(value == KARTENNAME_BAUFREIGABE)

        if self.logic:
            self.logic.set_kartenname_for_auswahl(value)

    def _on_massstab_changed(self, value: str) -> None:
        set_variable(MASSSTAB_VAR, value, scope="project")
        if self.logic:
            self.logic.set_plotmassstab_for_auswahl(value, self._get_current_canvas_scale())

    def _on_thema_changed(self, value: str) -> None:
        set_variable(THEMA_VAR, value, scope="project")
        if self.logic:
            self.logic.set_view_for_auswahl(value)

    def _on_zielgroesse_changed(self, value: str) -> None:
        set_variable(ZIELGROESSE_UI_VAR, value, scope="project")
        if self.logic:
            self.logic.set_zielgroesse_for_auswahl(value)

    def _on_formfaktor_changed(self, state: int) -> None:
        checked = bool(state)
        set_variable(FORMFAKTOR_UI_VAR, "Endlosrolle" if checked else "Blatt", scope="project")
        if self.logic:
            self.logic.set_formfaktor(checked)

    def _on_druckbereich_changed(self, value: str) -> None:
        if value not in DRUCKBEREICH_OPTIONEN:
            value = DRUCKBEREICH_VERFAHRENSGEBIET
        set_variable(DRUCKBEREICH_VAR, value, scope="project")
        if self.logic:
            self.logic.set_druckbereich_for_auswahl(value)
            if value == DRUCKBEREICH_RECHTECK:
                self.logic.activate_druckrechteck_capture()

    def _on_atlas_erzeugen_changed(self, state: int) -> None:
        enabled = bool(state)
        set_variable(ATLAS_ERZEUGEN_VAR, "1" if enabled else "0", scope="project")

        if self._atlas_layer_combo:
            set_enabled = getattr(self._atlas_layer_combo, "setEnabled", None)
            if callable(set_enabled):
                try:
                    set_enabled(enabled)
                except Exception:
                    pass

        if self._btn_auswahl_as_atlas:
            self._btn_auswahl_as_atlas.setEnabled(enabled)

    def _on_druckpuffer_clicked(self) -> None:
        if not self.pruefmanager:
            return

        current_value = get_variable(DRUCKPUFFER_VAR, scope="project") or str(DRUCKPUFFER_STANDARD_CM)
        text_value, bestaetigt = self.pruefmanager.frage_text(
            "Puffer um den Druckbereich",
            "Puffer um den Druckbereich",
            default_text=str(current_value),
        )
        if not bestaetigt:
            return

        try:
            puffer_value = int(str(text_value).strip())
        except (TypeError, ValueError):
            self.pruefmanager.zeige_hinweis(
                "Puffer um den Druckbereich",
                "Der Puffer muss als ganze Zahl eingegeben werden.",
            )
            return

        if puffer_value < 0:
            self.pruefmanager.zeige_hinweis(
                "Puffer um den Druckbereich",
                "Der Puffer darf nicht negativ sein.",
            )
            return

        set_variable(DRUCKPUFFER_VAR, str(puffer_value), scope="project")
        if self._druckpuffer_button:
            self._druckpuffer_button.setText(self._format_druckpuffer_label(puffer_value))

    def _format_druckpuffer_label(self, value_cm: int) -> str:
        return f"{value_cm} cm"

    def _on_vorlage_erstellen(self) -> None:
        if not self.logic or not self.pruefmanager:
            return

        self.logic.druckvorlage_anlegen(
            layer=None,
            kartenname_auswahl=self._kartenname_combo.currentText() if self._kartenname_combo else "",
            massstab_auswahl=self._massstab_combo.currentText() if self._massstab_combo else "",
            zielgroesse=self._zielgroesse_combo.currentText() if self._zielgroesse_combo else DIN_STANDARD,
            formfaktor=self._endlosrolle_cb.isChecked() if self._endlosrolle_cb else False,
            druckbereich_auswahl=self._druckbereich_combo.currentText() if self._druckbereich_combo else DRUCKBEREICH_VERFAHRENSGEBIET,
        )

    def _disconnect_project_signals(self) -> None:
        try:
            project = QgsProject.instance()
        except Exception:
            return

        if project is None:
            return

        for signal_name in ("readProject", "newProjectCreated", "cleared"):
            signal = getattr(project, signal_name, None)
            if signal is None:
                continue
            try:
                signal.disconnect(self._on_project_changed)
            except Exception:
                pass

    def cleanup(self) -> None:
        """Trennt Signalverbindungen vor dem Schliessen des Tabs."""
        self._disconnect_theme_collection_signals()
        self._disconnect_project_signals()

    def _connect_project_signals(self) -> None:
        try:
            project = QgsProject.instance()
        except Exception:
            return

        if project is None:
            return

        for signal_name in ("readProject", "newProjectCreated", "cleared"):
            signal = getattr(project, signal_name, None)
            if signal is None:
                continue
            try:
                signal.connect(self._on_project_changed)
            except Exception:
                pass

    def _on_project_changed(self, *args) -> None:
        _ = args
        self._disconnect_theme_collection_signals()
        self._theme_signal_connected = False
        self._connect_theme_collection_signals()
        self._restore_state()

    def _toggle_atlas(self, checked: bool) -> None:
        if self._atlas_button:
            self._atlas_button.setArrowType(ArrowDown if checked else ArrowRight)
        if self._atlas_content:
            self._atlas_content.setVisible(checked)

    def _restore_atlas_layer_selection(self) -> None:
        if not self._atlas_layer_combo:
            return

        layer_id = (get_variable("sn_abdeckungslayer", scope="project") or "").strip()
        if not layer_id:
            return

        try:
            layer = QgsProject.instance().mapLayer(layer_id)
            if layer is None:
                return

            set_current_layer = getattr(self._atlas_layer_combo, "setLayer", None)
            if callable(set_current_layer):
                set_current_layer(layer)
                return

            set_current_layer = getattr(self._atlas_layer_combo, "setCurrentLayer", None)
            if callable(set_current_layer):
                set_current_layer(layer)
        except Exception:
            pass

    def _disconnect_theme_collection_signals(self) -> None:
        collection = self._connected_theme_collection
        if collection is not None:
            for signal_name in ("mapThemesChanged", "changed", "themeChanged"):
                try:
                    signal = getattr(collection, signal_name, None)
                except RuntimeError:
                    break
                except Exception:
                    continue
                if signal is None:
                    continue
                try:
                    signal.disconnect(self._refresh_thema_combo_live)
                except Exception:
                    pass
        self._connected_theme_collection = None
        self._theme_signal_connected = False

    def _connect_theme_collection_signals(self) -> None:
        if self._theme_signal_connected:
            return

        try:
            theme_collection = QgsProject.instance().mapThemeCollection()
        except Exception:
            return

        if theme_collection is None:
            return

        connected_any = False
        for signal_name in ("mapThemesChanged", "changed", "themeChanged"):
            signal = getattr(theme_collection, signal_name, None)
            if signal is None:
                continue
            try:
                signal.connect(self._refresh_thema_combo_live)
                connected_any = True
            except Exception:
                pass

        if connected_any:
            self._connected_theme_collection = theme_collection
        self._theme_signal_connected = connected_any

    def _refresh_thema_combo_live(self, *args) -> None:
        _ = args
        if not self._thema_combo:
            return

        vorherige_auswahl = self._thema_combo.currentText() or THEMA_WIE_KARTENFENSTER
        eintraege = [THEMA_WIE_KARTENFENSTER, *self._get_gespeicherte_themen()]

        self._thema_combo.blockSignals(True)
        self._thema_combo.clear()
        self._thema_combo.addItems(eintraege)

        if vorherige_auswahl in eintraege:
            self._thema_combo.setCurrentText(vorherige_auswahl)
        else:
            self._thema_combo.setCurrentText(THEMA_WIE_KARTENFENSTER)
        self._thema_combo.blockSignals(False)

        self._on_thema_changed(self._thema_combo.currentText())

    def _get_gespeicherte_themen(self) -> list[str]:
        try:
            theme_collection = QgsProject.instance().mapThemeCollection()
            if theme_collection is None:
                return []
            themes = theme_collection.mapThemes()
        except Exception:
            return []

        namen: list[str] = []
        for theme_name in themes:
            name = str(theme_name or "").strip()
            if name and name not in namen:
                namen.append(name)

        return namen

    def _get_current_canvas_scale(self) -> float | None:
        try:
            canvas = iface.mapCanvas()
            if canvas is None:
                return None
            scale = canvas.scale()
            return float(scale) if scale else None
        except Exception:
            return None

    def _on_atlas_layer_changed(self, layer_or_name: Any) -> None:
        """Speichert den ausgewählten Atlas-Layer als Layer-ID in Projektvariablen."""
        if layer_or_name is None or layer_or_name == "":
            set_variable("sn_abdeckungslayer", "", scope="project")
            return

        # Standardfall QgsMapLayerComboBox: echtes Layer-Objekt
        layer_id_getter = getattr(layer_or_name, "id", None)
        if callable(layer_id_getter):
            layer_id = layer_id_getter() or ""
            set_variable("sn_abdeckungslayer", layer_id, scope="project")
            return

        # Fallback: ggf. Name aus Mock/anderen Widgets
        value = str(layer_or_name).strip()
        if not value:
            set_variable("sn_abdeckungslayer", "", scope="project")
            return

        try:
            project = QgsProject.instance()
            map_layers = project.mapLayers()
            for layer_id, layer in map_layers.items():
                if getattr(layer, "name", lambda: "")() == value:
                    set_variable("sn_abdeckungslayer", layer_id, scope="project")
                    return
        except Exception:
            pass

    def _on_auswahl_as_atlas_clicked(self) -> None:
        """Handler für Button 'Auswahl als Atlas anlegen'.

        Erstellt einen neuen Layer 'Atlaslayer' aus der aktuellen Feature-Auswahl
        und trägt ihn ins Atlas-Dropdown ein.
        """
        if not self.logic or not self.pruefmanager:
            return

        atlas_layer, layer_id = self.logic.create_atlas_layer_from_selection()
        if atlas_layer is None or not layer_id:
            return

        if self._atlas_button and self._atlas_content:
            self._atlas_button.setChecked(True)
            self._toggle_atlas(True)

        # Neu erstellten Layer im Layer-Combo setzen
        if self._atlas_layer_combo:
            set_current_layer = getattr(self._atlas_layer_combo, "setLayer", None)
            if callable(set_current_layer):
                try:
                    set_current_layer(atlas_layer)
                    return
                except Exception:
                    pass

            set_current_layer = getattr(self._atlas_layer_combo, "setCurrentLayer", None)
            if callable(set_current_layer):
                try:
                    set_current_layer(atlas_layer)
                    return
                except Exception:
                    pass

            # Fallback nur für Mock/klassische ComboBox
            self._populate_atlas_layer_combo()

    def _populate_atlas_layer_combo(self) -> None:
        """Fallback-Befüllung, falls kein echtes QgsMapLayerComboBox Verhalten verfügbar ist."""
        if not self._atlas_layer_combo:
            return

        clear_fn = getattr(self._atlas_layer_combo, "clear", None)
        add_item_fn = getattr(self._atlas_layer_combo, "addItem", None)
        if not callable(clear_fn) or not callable(add_item_fn):
            return

        self._atlas_layer_combo.blockSignals(True)
        clear_fn()
        add_item_fn("")

        try:
            project = QgsProject.instance()
            map_layers = getattr(project, "mapLayers", None)
            if not callable(map_layers):
                self._atlas_layer_combo.blockSignals(False)
                return

            layers = map_layers().values() if hasattr(map_layers(), "values") else map_layers()
            for layer in layers:
                layer_name = getattr(layer, "name", lambda: None)()
                if layer_name and layer_name not in ("", "Druckrechteck"):
                    add_item_fn(layer_name)
        except Exception:
            pass

        self._atlas_layer_combo.blockSignals(False)