#!/usr/bin/env python
# -*- coding: utf-8 -*-

#
#  Copylast 2019 The FATE 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.
#

from pipeline.param.base_param import BaseParam


class UnionParam(BaseParam):
    """
    Define the union method for combining multiple dTables and keep entries with the same id

    Parameters
    ----------
    need_run: bool, default True
        Indicate if this module needed to be run

    allow_missing: bool, default False
        Whether allow mismatch between feature length and header length in the result. Note that empty tables will always be skipped regardless of this param setting.

    keep_duplicate: bool, default False
        Whether to keep entries with duplicated keys. If set to True, a new id will be generated for duplicated entry in the format {id}_{table_name}.
    """

    def __init__(self, need_run=True, allow_missing=False, keep_duplicate=False):
        super().__init__()
        self.need_run = need_run
        self.allow_missing = allow_missing
        self.keep_duplicate = keep_duplicate

    def check(self):
        descr = "union param's "

        if type(self.need_run).__name__ != "bool":
            raise ValueError(
                descr + "need_run {} not supported, should be bool".format(
                    self.need_run))

        if type(self.allow_missing).__name__ != "bool":
            raise ValueError(
                descr + "allow_missing {} not supported, should be bool".format(
                    self.allow_missing))

        if type(self.keep_duplicate).__name__ != "bool":
            raise ValueError(
                descr + "keep_duplicate {} not supported, should be bool".format(
                    self.keep_duplicate))

        return True