#  $Id$
#
#  Copyright (C) 2003 Rational Discovery LLC
#     All Rights Reserved
#
from rdkit import Chem
from rdkit.VLib.Supply import SupplyNode


class SmilesSupplyNode(SupplyNode):
    """ Smiles supplier

    Sample Usage:
      >>> import os
      >>> from rdkit import RDConfig
      >>> fileN = os.path.join(RDConfig.RDCodeDir,'VLib','NodeLib',\
                               'test_data','pgp_20.txt')
      >>> suppl = SmilesSupplyNode(fileN,delim="\\t",smilesColumn=2,nameColumn=1,titleLine=1)
      >>> ms = [x for x in suppl]
      >>> len(ms)
      20
      >>> ms[0].GetProp("_Name")
      'ALDOSTERONE'
      >>> ms[0].GetProp("ID")
      'RD-PGP-0001'
      >>> ms[1].GetProp("_Name")
      'AMIODARONE'
      >>> ms[3].GetProp("ID")
      'RD-PGP-0004'
      >>> suppl.reset()
      >>> suppl.next().GetProp("_Name")
      'ALDOSTERONE'
      >>> suppl.next().GetProp("_Name")
      'AMIODARONE'
      >>> suppl.reset()

    """

    def __init__(self, fileName, delim="\t", nameColumn=1, smilesColumn=0, titleLine=0, **kwargs):
        SupplyNode.__init__(self, **kwargs)
        self._fileName = fileName
        self._supplier = Chem.SmilesMolSupplier(self._fileName, delimiter=delim,
                                                smilesColumn=smilesColumn, nameColumn=nameColumn,
                                                titleLine=titleLine)

    def reset(self):
        SupplyNode.reset(self)
        self._supplier.reset()

    def next(self):
        """

        """
        r = None
        while not r:
            r = next(self._supplier)
        return r


SmilesSupplyNode.__next__ = SmilesSupplyNode.next


# ------------------------------------
#
#  doctest boilerplate
#
def _runDoctests(verbose=None):  # pragma: nocover
    import doctest
    import sys
    failed, _ = doctest.testmod(optionflags=doctest.ELLIPSIS, verbose=verbose)
    sys.exit(failed)


if __name__ == '__main__':  # pragma: nocover
    _runDoctests()