# -*- coding: utf-8 -*-
"""
/***************************************************************************
 SlopeGenerator
                                 A QGIS plugin
 Plugin for generate slope sing
 Generated by Plugin Builder: http://g-sherman.github.io/Qgis-Plugin-Builder/
                              -------------------
        begin                : 2025-10-02
        git sha              : $Format:%H$
        copyright            : (C) 2025 by santerr80
        email                : santerr80@gmail.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
"""
import os.path
from importlib import import_module

from qgis.PyQt.QtCore import QCoreApplication, QSettings, QTranslator
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtWidgets import QAction

# Initialize Qt resources from file resources.py
import_module(".resources", package=__package__)

# Import the code for the dialog
from .slope_generator_dialog import SlopeGeneratorDialog


class SlopeGenerator:
    """QGIS Plugin Implementation.

    This class integrates the plugin into QGIS UI:
    - registers menu and toolbar actions;
    - opens the main dialog window on trigger;
    - manages translator and lifetime of the dialog instance.

    Attributes:
    - iface: reference to the QGIS interface (`QgsInterface`).
    - plugin_dir: plugin directory path.
    - translator: `QTranslator` installed when a locale is available.
    - actions: list of created QAction instances to remove on unload.
    - menu: localized plugin menu label.
    - first_start: first-run flag for the current QGIS session.
    - dlg: instance of `SlopeGeneratorDialog` or None when closed.
    """

    def __init__(self, iface):
        """Constructor.

        :param iface: An interface instance that will be passed to this class
            which provides the hook by which you can manipulate the QGIS
            application at run time.
        :type iface: QgsInterface
        """
        # Save reference to the QGIS interface
        self.iface = iface
        # initialize plugin directory
        self.plugin_dir = os.path.dirname(__file__)
        # initialize locale
        locale = QSettings().value("locale/userLocale")[0:2]
        locale_path = os.path.join(
            self.plugin_dir, "i18n", "SlopeGenerator_{}.qm".format(locale)
        )

        if os.path.exists(locale_path):
            self.translator = QTranslator()
            self.translator.load(locale_path)
            QCoreApplication.installTranslator(self.translator)

        # Declare instance attributes
        self.actions = []
        self.menu = self.tr("&Slope Generator")

        # Check if plugin was started the first time in current QGIS session
        # Must be set in initGui() to survive plugin reloads
        self.first_start = None

        self.dlg = None

    # noinspection PyMethodMayBeStatic
    def tr(self, message):
        """Get the translation for a string using Qt translation API.

        We implement this ourselves since we do not inherit QObject.

        :param message: String for translation.
        :type message: str, QString

        :returns: Translated version of message.
        :rtype: QString
        """
        # noinspection PyTypeChecker,PyArgumentList,PyCallByClass
        return QCoreApplication.translate("SlopeGenerator", message)

    def add_action(
        self,
        icon_path,
        text,
        callback,
        enabled_flag=True,
        add_to_menu=True,
        add_to_toolbar=True,
        status_tip=None,
        whats_this=None,
        parent=None,
    ):
        """Add a toolbar icon to the toolbar.

        :param icon_path: Path to the icon for this action. Can be a resource
            path (e.g. ':/plugins/foo/bar.png') or a normal file system path.
        :type icon_path: str

        :param text: Text that should be shown in menu items for this action.
        :type text: str

        :param callback: Function to be called when the action is triggered.
        :type callback: function

        :param enabled_flag: A flag indicating if the action should be enabled
            by default. Defaults to True.
        :type enabled_flag: bool

        :param add_to_menu: Flag indicating whether the action should also
            be added to the menu. Defaults to True.
        :type add_to_menu: bool

        :param add_to_toolbar: Flag indicating whether the action should also
            be added to the toolbar. Defaults to True.
        :type add_to_toolbar: bool

        :param status_tip: Optional text to show in a popup when mouse pointer
            hovers over the action.
        :type status_tip: str

        :param parent: Parent widget for the new action. Defaults None.
        :type parent: QWidget

        :param whats_this: Optional text to show in the status bar when the
            mouse pointer hovers over the action.

        :returns: The created action; it is also stored in `self.actions`.
        :rtype: QAction
        """

        icon = QIcon(icon_path)
        action = QAction(icon, text, parent)
        action.triggered.connect(callback)
        action.setEnabled(enabled_flag)

        if status_tip is not None:
            action.setStatusTip(status_tip)

        if whats_this is not None:
            action.setWhatsThis(whats_this)

        if add_to_toolbar:
            # Adds plugin icon to Plugins toolbar
            self.iface.addToolBarIcon(action)

        if add_to_menu:
            self.iface.addPluginToMenu(self.menu, action)

        self.actions.append(action)

        return action

    def initGui(self):
        """Create the menu entries and toolbar icons inside the QGIS GUI."""

        icon_path = ":/plugins/slope_generator/icon.png"
        self.add_action(
            icon_path,
            text=self.tr("Slope sign generator"),
            callback=self.run,
            parent=self.iface.mainWindow(),
        )

        # will be set False in run()
        self.first_start = True

    def unload(self):
        """Removes the plugin menu item and icon from QGIS GUI."""
        for action in self.actions:
            self.iface.removePluginMenu(self.tr("&Slope Generator"), action)
            self.iface.removeToolBarIcon(action)

    # В файле slope_generator.py, внутри класса SlopeGenerator

    def run(self):
        """Show the main dialog, creating it if needed.

        Keeps a single dialog instance and restores focus when re-triggered.
        """

        # Create dialog if needed (first run or after it was closed)
        if self.dlg is None:
            self.dlg = SlopeGeneratorDialog(self.iface)

        # Now we are sure the dialog exists. Show it.
        self.dlg.show()

        # Ensure the dialog stays on top when re-triggered
        self.dlg.raise_()
        self.dlg.activateWindow()
