"""Dialogue pour saisir un format personnalise."""

import os
import sys
import json
from PyQt6.QtWidgets import (QDialog, QVBoxLayout, QHBoxLayout, QLabel,
                              QDoubleSpinBox, QLineEdit, QDialogButtonBox,
                              QGroupBox, QCheckBox)
from app.engine.pdf_utils import mm_to_pt

CUSTOM_SIZES_FILE = os.path.join(
    os.path.dirname(sys.executable) if getattr(sys, 'frozen', False)
    else os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))),
    ".custom_sizes.json"
)


def load_custom_sizes():
    """Charger les formats personnalises sauvegardes."""
    if not os.path.exists(CUSTOM_SIZES_FILE):
        return {}
    try:
        with open(CUSTOM_SIZES_FILE, "r") as f:
            return json.load(f)
    except Exception:
        return {}


def save_custom_sizes(sizes):
    """Sauvegarder les formats personnalises."""
    try:
        with open(CUSTOM_SIZES_FILE, "w") as f:
            json.dump(sizes, f, indent=2)
    except Exception:
        pass


class CustomSizeDialog(QDialog):
    """Dialogue pour saisir une taille personnalisee."""

    def __init__(self, save_mode=False, parent=None):
        super().__init__(parent)
        self.setWindowTitle("Ajouter un format" if save_mode else "Format personnalise")
        self.setMinimumWidth(350)
        self._save_mode = save_mode
        self._setup_ui()

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

        if self._save_mode:
            name_layout = QHBoxLayout()
            name_layout.addWidget(QLabel("Nom du format :"))
            self.edit_name = QLineEdit()
            self.edit_name.setPlaceholderText("ex: Carte de visite")
            name_layout.addWidget(self.edit_name)
            layout.addLayout(name_layout)
            layout.addSpacing(10)

        grp = QGroupBox("Dimensions (mm)")
        gl = QHBoxLayout(grp)
        gl.addWidget(QLabel("Largeur :"))
        self.spin_w = QDoubleSpinBox()
        self.spin_w.setRange(10, 5000)
        self.spin_w.setValue(210)
        self.spin_w.setSuffix(" mm")
        self.spin_w.setDecimals(1)
        self.spin_w.setSingleStep(1.0)
        self.spin_w.setMinimumWidth(100)
        gl.addWidget(self.spin_w)
        gl.addWidget(QLabel("Hauteur :"))
        self.spin_h = QDoubleSpinBox()
        self.spin_h.setRange(10, 5000)
        self.spin_h.setValue(297)
        self.spin_h.setSuffix(" mm")
        self.spin_h.setDecimals(1)
        self.spin_h.setSingleStep(1.0)
        self.spin_h.setMinimumWidth(100)
        gl.addWidget(self.spin_h)
        layout.addWidget(grp)

        self.chk_landscape = QCheckBox("Paysage (inverser largeur/hauteur)")
        layout.addWidget(self.chk_landscape)

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

    def get_size(self):
        """Retourne (largeur, hauteur) en points."""
        w = mm_to_pt(self.spin_w.value())
        h = mm_to_pt(self.spin_h.value())
        if self.chk_landscape.isChecked():
            w, h = h, w
        return (w, h)

    def get_name(self):
        if self._save_mode:
            return self.edit_name.text().strip()
        return f"{self.spin_w.value():.0f}x{self.spin_h.value():.0f}mm"

    def get_size_mm(self):
        w = self.spin_w.value()
        h = self.spin_h.value()
        if self.chk_landscape.isChecked():
            w, h = h, w
        return (w, h)