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# Author: Isaac Saito

from __future__ import division

from python_qt_binding.QtGui import QStandardItemModel

from rqt_reconfigure import logging


class TreenodeItemModel(QStandardItemModel):
    """
    This class is made only for this purpose.

    To hold QStandardItem instances
    associated with QModelIndex. QStandardItemModel has methods to return it
    by index called itemFromIndex, but in some cases the method doesn't work
    for unknown reasons. Ref. question asked:
    http://stackoverflow.com/questions/14646979/strange-index-values-from-qstandarditemmodel

    :author: Isaac Saito
    """

    def __init__(self, parent=None):
        super(TreenodeItemModel, self).__init__(parent)
        self._parent = parent

        self._indexes = {}  # { str : QPersistentModelIndex }

    def get_index_from_grn(self, grn):
        """
        Get the index from grn.

        :type grn: str
        :rtype: QPersistentModelIndex. None if the corresponding item isn't
                found.
        """
        logging.debug('get_index_from_grn all item={}'.format(self._indexes))
        return self._indexes.get(grn)

    def set_item_from_index(self, grn, qpindex):
        logging.debug('set_item_from_index grn={} qpindex={}'.format(
            grn, qpindex
        ))
        self._indexes[grn] = qpindex
