# -*- coding: utf-8 -*-
"""
/***************************************************************************
 MapSafe
                                 A QGIS plugin
 export vector layers to common format and crs
 Generated by Plugin Builder: http://g-sherman.github.io/Qgis-Plugin-Builder/
                              -------------------
        begin                : 2018-12-08
        git sha              : $Format:%H$
        copyright            : (C) 2018 by Zoltan Siki
        email                : siki1958@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 PyQt5.QtCore import (QSettings, QTranslator, qVersion, QCoreApplication)
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import (QAction, QMessageBox)
from qgis.core import (QgsVectorFileWriter, QgsProject, QgsMapLayer,
    QgsLayerDefinition)

# Initialize Qt resources from file resources.py
from .resources import *
# Import the code for the dialog
from .mapsafe_dialog import MapSafeDialog

from .settings import apply_settings

class MapSafe:
    """QGIS Plugin Implementation."""

    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
        """

        # install libraries
        apply_settings()

        # 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',
            'MapSafe_{}.qm'.format(locale))

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

            if qVersion() > '4.3.3':
                QCoreApplication.installTranslator(self.translator)

        # Create the dialog (after translation) and keep reference
        self.dlg = MapSafeDialog()
        self.dlg.setModal(True)

        # Declare instance attributes
        self.actions = []
        self.menu = self.tr(u'&mapsafe')
        # TODO: We are going to let the user set this up in a future iteration
        self.toolbar = self.iface.addToolBar(u'MapSafe')
        self.toolbar.setObjectName(u'MapSafe')

    # 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('MapSafe', 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 action that was created. Note that the action is also
            added to self.actions list.
        :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:
            self.toolbar.addAction(action)

        if add_to_menu:
            self.iface.addPluginToVectorMenu(
                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 = f'{self.plugin_dir}/icon.png'
        self.add_action(
            icon_path,
            text=self.tr(u'MapSafe'),
            callback=self.run,
            parent=self.iface.mainWindow())


    def unload(self):
        """Removes the plugin menu item and icon from QGIS GUI."""
        for action in self.actions:
            self.iface.removePluginVectorMenu(
                self.tr(u'&mapsafe'),
                action)
            self.iface.removeToolBarIcon(action)
        # remove the toolbar
        del self.toolbar


    def run(self):
        """Run method that performs all the real work"""
        # show the dialog
        self.dlg.show()
        # Run the dialog event loop
        result = self.dlg.exec_()
        # See if OK was pressed
        if result:
            # get directry name
            dirName = self.dlg.dirEdit.text().strip()
            # get ogr driver name
            ogr_driver_name = self.dlg.formatBox.currentText()
            exportOnlySelected = self.dlg.onlySelected.isChecked()
            print('Selected: ', exportOnlySelected)
            sldExport = self.dlg.sldExport.isChecked()
            qlrExport = self.dlg.qlrExport.isChecked()
            qmlExport = self.dlg.qmlExport.isChecked()
            crs = QgsProject.instance().crs()
            for layer in self.iface.mapCanvas().layers():
                if layer.type() == QgsMapLayer.VectorLayer:
                    print('Writing:' + layer.name())
                    layer_filename = os.path.join(dirName, layer.name())
                    if self.dlg.layerCrsButton.isChecked():
                        crs = layer.crs()
                        print('CRS selected: ', crs.description())
                    # Thijs Brentjens (https://github.com/thijsbrentjens/)
                    # add option for exporting only selected features
                    result2 = QgsVectorFileWriter.writeAsVectorFormat(layer,
                        layer_filename, layer.dataProvider().encoding(), crs,
                        ogr_driver_name, exportOnlySelected)
                    if result2[0]:
                        QMessageBox.warning(self.dlg, "MapSafe",\
                            "Failed to export: " + layer.name() + \
                            " Status: " + str(result2))
                    else:
                        if sldExport:
                            # export SLD if layer was exported with success
                            layer.saveSldStyle(layer_filename + '.sld')
                        if qlrExport:
                            # export QGIS layer definition (qlr)
                            node = QgsProject.instance().layerTreeRoot().findLayer(layer.id())
                            QgsLayerDefinition.exportLayerDefinition(
                                layer_filename, [node])
                        if qmlExport:
                            qml = os.path.splitext(layer_filename)[0] + '.qml'
                            layer.saveNamedStyle(qml)
