"""ComboBox de formats de page avec support personnalise."""

from PyQt6.QtWidgets import QComboBox
from app.engine.pdf_utils import PAGE_SIZES, mm_to_pt
from app.dialogs.custom_size_dialog import (CustomSizeDialog, load_custom_sizes,
                                             save_custom_sizes)


SEP = "---"
CUSTOM_LABEL = "Personnalise..."
ADD_LABEL = "Ajouter un format..."


def populate_format_combo(combo, default="A4 Paysage"):
    """Remplir un combo avec les formats standard + custom + options."""
    combo.blockSignals(True)
    combo.clear()

    # Formats standard
    for name in PAGE_SIZES:
        combo.addItem(name, PAGE_SIZES[name])

    # Formats custom sauvegardes
    custom = load_custom_sizes()
    if custom:
        combo.insertSeparator(combo.count())
        for name, size in custom.items():
            combo.addItem(name, (size[0], size[1]))

    # Options speciales
    combo.insertSeparator(combo.count())
    combo.addItem(CUSTOM_LABEL, None)
    combo.addItem(ADD_LABEL, None)

    # Selectionner le defaut
    idx = combo.findText(default)
    if idx >= 0:
        combo.setCurrentIndex(idx)

    combo.blockSignals(False)


def handle_format_selection(combo, parent=None):
    """Gerer la selection dans le combo. Retourne (w, h) en points ou None si annule."""
    text = combo.currentText()

    if text == CUSTOM_LABEL:
        dlg = CustomSizeDialog(save_mode=False, parent=parent)
        if dlg.exec():
            size = dlg.get_size()
            name = dlg.get_name()
            # Ajouter temporairement dans le combo
            combo.blockSignals(True)
            combo.insertItem(combo.count() - 3, name, size)
            combo.setCurrentText(name)
            combo.blockSignals(False)
            return size
        # Annule — revenir au precedent
        combo.blockSignals(True)
        combo.setCurrentIndex(0)
        combo.blockSignals(False)
        return None

    elif text == ADD_LABEL:
        dlg = CustomSizeDialog(save_mode=True, parent=parent)
        if dlg.exec():
            name = dlg.get_name()
            if not name:
                name = dlg.get_name()
            size = dlg.get_size()
            # Sauvegarder
            custom = load_custom_sizes()
            w_mm, h_mm = dlg.get_size_mm()
            custom[name] = [mm_to_pt(w_mm), mm_to_pt(h_mm)]
            save_custom_sizes(custom)
            # Recharger le combo
            populate_format_combo(combo, name)
            return size
        combo.blockSignals(True)
        combo.setCurrentIndex(0)
        combo.blockSignals(False)
        return None

    else:
        return combo.currentData()


def get_selected_size(combo):
    """Obtenir la taille selectionnee. Retourne (w, h) en points."""
    data = combo.currentData()
    if data:
        return data
    return PAGE_SIZES.get(combo.currentText(), (595.28, 841.89))