# Copyright (C) 2018-2022 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

import logging as log
from builtins import AttributeError

from defusedxml import ElementTree

from openvino.tools.mo.front.caffe.collect_attributes import collect_attributes
from openvino.tools.mo.front.caffe.extractor import node_pb_arg
from openvino.tools.mo.front.common.register_custom_ops import check_for_duplicates, add_or_override_extractor


def expected_attribs(layer_attrs: list, attrs: list, fileName: str):
    missing = [attr for attr in attrs if attr not in layer_attrs]
    if len(missing):
        layer = "layer {}".format(layer_attrs['NativeType']) if 'NativeType' in layer_attrs else "one of the layers"
        log.error('Missing required attribute(s) {} for {} in {}. Skipped.'.format(', '.join(missing), layer, fileName))
        return False
    return True


def load_layers_xml(fileName: str):
    try:
        xml = ElementTree.parse(fileName).getroot()
    except:
        return {}

    layers_map = {}
    for child in xml:
        if child.tag == 'CustomLayer':
            if expected_attribs(child.attrib, ['NativeType', 'hasParam'], fileName):
                layer = child.attrib['NativeType']
                if layer in layers_map:
                    log.error('Duplicated layer definition in {} for NativeType = {}. Skipped.'.format(fileName, layer))
                else:
                    has_param = child.attrib['hasParam'].lower()
                    if has_param == 'true' and expected_attribs(child.attrib, ['protoParamName'],
                                                                fileName) or has_param == 'false':
                        layers_map[layer] = child.attrib
                    else:
                        log.error(
                            'Cannot recognize {} value for hasParam for layer {}. Should be true or false. Skipped.'.format(
                                child.attrib['hasParam'], layer))

        else:
            log.error('Unexpected "{}" tag in {}. Should be CustomLayer. Skipped.'.format(child.tag, fileName))
    return layers_map


special_keys = ['id', 'name', 'precision', 'type', 'layer', 'value', 'shape', 'op', 'kind', 'infer']

obfuscation_counter = 0


def new_obfuscated_key(attrs: dict, key: str):
    global obfuscation_counter
    while True:
        new_key = key + str(obfuscation_counter)
        obfuscation_counter += 1
        if new_key not in attrs and new_key not in special_keys:
            return new_key


def obfuscate_attr_key(attrs: dict, key: str, keys: list):
    """
    Replace attribute with key by another key that is not in
    special_keys list and do not match other attributes.
    """
    if key not in attrs or key not in special_keys:
        return

    new_key = new_obfuscated_key(attrs, key)
    assert new_key not in attrs
    assert new_key not in keys
    attrs[new_key] = attrs[key]
    del attrs[key]
    key_index = keys.index(key)
    keys[key_index] = (key, new_key)
    log.debug('Obfuscated attribute name {} to {}'.format(key, new_key))


def obfuscate_special_attrs(attrs: dict, keys: list):
    for key in special_keys:
        obfuscate_attr_key(attrs, key, keys)


def proto_extractor(pb, model_pb, mapping, disable_omitting_optional, enable_flattening_nested_params):
    log.info("Custom extractor for layer {} with mapping {}".format(pb.type, mapping))
    log.debug('Found custom layer {}. Params are processed'.format(pb.name))
    if mapping['hasParam'].lower() != 'true':
        return {}
    try:
        native_attr = collect_attributes(getattr(pb, mapping['protoParamName']),
                                         disable_omitting_optional=disable_omitting_optional,
                                         enable_flattening_nested_params=enable_flattening_nested_params)
    except AttributeError as e:
        error_message = 'Layer {} has no attribute {}'.format(pb.type, str(e).split(' ')[-1])
        log.error(error_message)
        raise ValueError(error_message)
    keys = list(native_attr.keys())
    obfuscate_special_attrs(native_attr, keys)
    # avoid 'mo_caffe' appearing in param
    for attr in native_attr:
        if 'mo_caffe' in native_attr[attr]:
            native_attr[attr] = native_attr[attr].replace('mo_caffe', 'caffe')
    log.debug(str(keys))
    log.debug(str(native_attr))

    attrs = {
        'IE': [(
            'layer',
            [('id', lambda node: node.id), 'name', 'type'],
            [
                ('data', keys, []),
                '@ports',
                '@consts'])]}
    attrs.update(native_attr)
    return attrs


def update_extractors(extractors, layers_map, disable_omitting_optional, enable_flattening_nested_params):
    keys = check_for_duplicates(extractors)
    for layer, attrs in layers_map.items():
        add_or_override_extractor(
            extractors,
            keys,
            layer,
            (
                lambda l: node_pb_arg(
                    lambda pb, model_pb: proto_extractor(
                        pb, model_pb, l, disable_omitting_optional, enable_flattening_nested_params
                    )
                )
            )(layers_map[layer]),
            'custom layer {} from custom layers mapping xml file'.format(layer)
        )
    check_for_duplicates(extractors)
