"""Dialogue N pages par feuille."""

from PyQt6.QtWidgets import (QDialog, QVBoxLayout, QHBoxLayout, QLabel,
                              QComboBox, QGroupBox, QSpinBox, QCheckBox,
                              QDialogButtonBox, QDoubleSpinBox, QFileDialog)
from app.engine.pdf_utils import PAGE_SIZES, mm_to_pt


class NupDialog(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setWindowTitle("N pages par feuille")
        self.setMinimumWidth(450)
        self._bg_path = None
        self._setup_ui()

    def _setup_ui(self):
        layout = QVBoxLayout(self)

        # Grille
        grp_grid = QGroupBox("Disposition")
        gl = QHBoxLayout(grp_grid)
        gl.addWidget(QLabel("Colonnes :"))
        self.spin_cols = QSpinBox()
        self.spin_cols.setRange(1, 10)
        self.spin_cols.setValue(2)
        gl.addWidget(self.spin_cols)
        gl.addWidget(QLabel("Lignes :"))
        self.spin_rows = QSpinBox()
        self.spin_rows.setRange(1, 10)
        self.spin_rows.setValue(2)
        gl.addWidget(self.spin_rows)
        layout.addWidget(grp_grid)

        # Taille feuille
        grp_sheet = QGroupBox("Taille de la feuille")
        sl = QHBoxLayout(grp_sheet)
        sl.addWidget(QLabel("Format :"))
        self.combo_sheet = QComboBox()
        for name in PAGE_SIZES:
            self.combo_sheet.addItem(name)
        self.combo_sheet.setCurrentText("A4 Paysage")
        sl.addWidget(self.combo_sheet)
        layout.addWidget(grp_sheet)

        # Marges
        grp_margins = QGroupBox("Marges (mm)")
        ml = QHBoxLayout(grp_margins)
        self.margins = {}
        for label in ["Haut", "Bas", "Gauche", "Droite"]:
            ml.addWidget(QLabel(f"{label}:"))
            spin = QDoubleSpinBox()
            spin.setRange(0, 100)
            spin.setValue(5)
            spin.setSuffix(" mm")
            ml.addWidget(spin)
            self.margins[label.lower()] = spin
        layout.addWidget(grp_margins)

        # Gouttiere
        grp_gutter = QGroupBox("Gouttiere (mm)")
        gutl = QHBoxLayout(grp_gutter)
        gutl.addWidget(QLabel("Horizontale :"))
        self.spin_gutter_h = QDoubleSpinBox()
        self.spin_gutter_h.setRange(0, 50)
        self.spin_gutter_h.setValue(0)
        self.spin_gutter_h.setSuffix(" mm")
        gutl.addWidget(self.spin_gutter_h)
        gutl.addWidget(QLabel("Verticale :"))
        self.spin_gutter_v = QDoubleSpinBox()
        self.spin_gutter_v.setRange(0, 50)
        self.spin_gutter_v.setValue(0)
        self.spin_gutter_v.setSuffix(" mm")
        gutl.addWidget(self.spin_gutter_v)
        layout.addWidget(grp_gutter)

        # Options
        grp_opts = QGroupBox("Options")
        ol = QVBoxLayout(grp_opts)
        self.chk_fit = QCheckBox("Ajuster les pages a la cellule")
        self.chk_fit.setChecked(True)
        ol.addWidget(self.chk_fit)
        self.chk_crop = QCheckBox("Reperes de coupe")
        ol.addWidget(self.chk_crop)

        bg_layout = QHBoxLayout()
        self.chk_bg = QCheckBox("Fond PDF :")
        bg_layout.addWidget(self.chk_bg)
        self.lbl_bg = QLabel("Aucun")
        bg_layout.addWidget(self.lbl_bg)
        from PyQt6.QtWidgets import QPushButton
        btn_bg = QPushButton("Choisir...")
        btn_bg.clicked.connect(self._choose_bg)
        bg_layout.addWidget(btn_bg)
        bg_layout.addStretch()
        ol.addLayout(bg_layout)

        layout.addWidget(grp_opts)

        # Boutons
        buttons = QDialogButtonBox(
            QDialogButtonBox.StandardButton.Ok | QDialogButtonBox.StandardButton.Cancel
        )
        buttons.accepted.connect(self.accept)
        buttons.rejected.connect(self.reject)
        layout.addWidget(buttons)

    def _choose_bg(self):
        path, _ = QFileDialog.getOpenFileName(self, "Choisir un fond PDF", "", "PDF (*.pdf)")
        if path:
            self._bg_path = path
            self.lbl_bg.setText(path.split("/")[-1].split("\\")[-1])
            self.chk_bg.setChecked(True)

    def get_settings(self):
        sheet_text = self.combo_sheet.currentText()
        sheet_size = PAGE_SIZES[sheet_text]
        return {
            "cols": self.spin_cols.value(),
            "rows": self.spin_rows.value(),
            "sheet_size": sheet_size,
            "margin_top": mm_to_pt(self.margins["haut"].value()),
            "margin_bottom": mm_to_pt(self.margins["bas"].value()),
            "margin_left": mm_to_pt(self.margins["gauche"].value()),
            "margin_right": mm_to_pt(self.margins["droite"].value()),
            "gutter_h": mm_to_pt(self.spin_gutter_h.value()),
            "gutter_v": mm_to_pt(self.spin_gutter_v.value()),
            "scale_mode": "fit" if self.chk_fit.isChecked() else "none",
            "crop_marks": self.chk_crop.isChecked(),
            "background_path": self._bg_path if self.chk_bg.isChecked() else None,
        }