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import os

from ament_index_python.resources import get_resource

from python_qt_binding import loadUi
from python_qt_binding.QtGui import QIcon
from python_qt_binding.QtWidgets import QWidget


class FilterWrapperWidget(QWidget):

    """
    Wraps the other filter widgets to provide enable check box, delete button control and uniform
    labeling
    """

    def __init__(self, widget, filter_name):
        """
        :param widget: the Qwidget to wrap ''Qwidget''
        :param filter_name: the name to be placed on the label ''str''
        """
        super(FilterWrapperWidget, self).__init__()

        pkg_name = 'rqt_console'
        _, package_path = get_resource('packages', pkg_name)
        ui_file = os.path.join(
            package_path, 'share', pkg_name, 'resource', 'filters', 'filter_wrapper_widget.ui')

        loadUi(ui_file, self)
        self.setObjectName('FilterWrapperWidget')
        self.delete_button.setIcon(QIcon.fromTheme('list-remove'))
        self._widget = widget

        # Replace the placeholder QWidget with the passed in object
        stretch = self.layout_frame.stretch(2)
        self.layout_frame.insertWidget(2, widget)
        self.layout_frame.setStretch(2, stretch)

        # This line sets the place holder to 0 width so it can no longer be seen
        # It is a hack since removing it causes other widgets not to function properly
        self.layout_frame.setStretch(3, 0)

        self.enabled_checkbox.clicked[bool].connect(self.enabled_callback)
        self.filter_name_label.setText(filter_name + ':')

    def enabled_callback(self, checked):
        self._widget._parentfilter.set_enabled(checked)
        self._widget.setEnabled(checked)

    def repopulate(self):
        self._widget.repopulate()

    def save_settings(self, settings):
        """
        Handles writing the enabled flag to the ini file and then passes the
        settings object to the wrapped widget

        :param settings: used to write the settings to an ini file ''qt_gui.settings.Settings''
        """
        settings.set_value('enabled', self._widget._parentfilter._enabled)
        self._widget.save_settings(settings)

    def restore_settings(self, settings):
        """
        Handles reading the enabled flag from the ini file.
        :param settings: used to read the settings to an ini file ''qt_gui.settings.Settings''
        """
        checked = settings.value('enabled') in [True, 'true']
        self.enabled_callback(checked)
        self.enabled_checkbox.setChecked(checked)
        self._widget.restore_settings(settings)
