## ###
# IP: GHIDRA
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##
from ctypes import *

from comtypes import COMError
from comtypes.gen import DbgMod
from comtypes.hresult import S_OK, S_FALSE
from pybag.dbgeng import exception

from . import imodelobject as mo


class ModelIterator(object):
    def __init__(self, iter):
        self._iter = iter
        self._index = 0
        iter.AddRef()

    # ModelIterator

    def GetNext(self, dimensions):
        object = POINTER(DbgMod.IModelObject)()
        indexer = POINTER(DbgMod.IModelObject)()
        metadata = POINTER(DbgMod.IKeyStore)()
        try:
            self._iter.GetNext(byref(object), dimensions,
                               byref(indexer), byref(metadata))
        except COMError as ce:
            return None
        if "ptr=0x0" in str(indexer):
            next = (self._index, mo.ModelObject(object))
            self._index += 1
            return next

        index = mo.ModelObject(indexer)
        ival = index.GetIntrinsicValue()
        if ival is None:
            next = (self._index, mo.ModelObject(object))
            self._index += 1
            return next
        return (ival.value, mo.ModelObject(object))

    def Reset(self):
        hr = self._keys.Reset()
        exception.check_err(hr)