# coding=utf-8
# Copyright 2021 The IDEA Authors. All rights reserved.

# 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.

import collections
from typing import List, Dict, Tuple


def get_choice(spo_choice: list) -> tuple:
    """ 把关系schema中的关系、实体获取出来

    Args:
        spo_choice (list): 关系schema

    Returns:
        tuple:
            choice_ent (list)
            choice_rel (list)
            choice_head (list)
            choice_tail (list)
            entity2rel (dict)
    """
    choice_head = []
    choice_tail = []
    choice_ent = []
    choice_rel = []
    entity2rel = collections.defaultdict(list) # "subject|object" -> [relation]

    for head, rel, tail in spo_choice:

        if head not in choice_head:
            choice_head.append(head)
        if tail not in choice_tail:
            choice_tail.append(tail)

        if head not in choice_ent:
            choice_ent.append(head)
        if tail not in choice_ent:
            choice_ent.append(tail)

        if rel not in choice_rel:
            choice_rel.append(rel)

        entity2rel[head, tail].append(rel)

    return choice_ent, choice_rel, choice_head, choice_tail, entity2rel