#   Copyright (c) 2018 PaddlePaddle 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.

__all__ = []


class EntryAttr:
    """
    Entry Config for paddle.static.nn.sparse_embedding with Parameter Server.

    Examples:
        .. code-block:: python

            >>> import paddle
            >>> paddle.enable_static()

            >>> sparse_feature_dim = 1024
            >>> embedding_size = 64

            >>> entry = paddle.distributed.ProbabilityEntry(0.1)

            >>> input = paddle.static.data(name='ins', shape=[1], dtype='int64')

            >>> emb = paddle.static.nn.sparse_embedding(
            ...     input=input,
            ...     size=[sparse_feature_dim, embedding_size],
            ...     is_test=False,
            ...     entry=entry,
            ...     param_attr=paddle.ParamAttr(
            ...         name="SparseFeatFactors",
            ...         initializer=paddle.nn.initializer.Uniform()
            ...     )
            ... )

    """

    def __init__(self):
        self._name = None

    def _to_attr(self):
        """
        Returns the attributes of this parameter.

        Returns:
            Parameter attributes(map): The attributes of this parameter.
        """
        raise NotImplementedError("EntryAttr is base class")


class ProbabilityEntry(EntryAttr):
    """
    Examples:
        .. code-block:: python

            >>> import paddle
            >>> paddle.enable_static()

            >>> sparse_feature_dim = 1024
            >>> embedding_size = 64

            >>> entry = paddle.distributed.ProbabilityEntry(0.1)

            >>> input = paddle.static.data(name='ins', shape=[1], dtype='int64')

            >>> emb = paddle.static.nn.sparse_embedding(
            ...     input=input,
            ...     size=[sparse_feature_dim, embedding_size],
            ...     is_test=False,
            ...     entry=entry,
            ...     param_attr=paddle.ParamAttr(
            ...         name="SparseFeatFactors",
            ...         initializer=paddle.nn.initializer.Uniform()
            ...     )
            ... )


    """

    def __init__(self, probability):
        super().__init__()

        if not isinstance(probability, float):
            raise ValueError("probability must be a float in (0,1)")

        if probability <= 0 or probability >= 1:
            raise ValueError("probability must be a float in (0,1)")

        self._name = "probability_entry"
        self._probability = probability

    def _to_attr(self):
        return ":".join([self._name, str(self._probability)])


class CountFilterEntry(EntryAttr):
    """
    Examples:
        .. code-block:: python

            >>> import paddle
            >>> paddle.enable_static()

            >>> sparse_feature_dim = 1024
            >>> embedding_size = 64

            >>> entry = paddle.distributed.CountFilterEntry(10)

            >>> input = paddle.static.data(name='ins', shape=[1], dtype='int64')

            >>> emb = paddle.static.nn.sparse_embedding(
            ...     input=input,
            ...     size=[sparse_feature_dim, embedding_size],
            ...     is_test=False,
            ...     entry=entry,
            ...     param_attr=paddle.ParamAttr(
            ...         name="SparseFeatFactors",
            ...         initializer=paddle.nn.initializer.Uniform()
            ...     )
            ... )

    """

    def __init__(self, count_filter):
        super().__init__()

        if not isinstance(count_filter, int):
            raise ValueError(
                "count_filter must be a valid integer greater than 0"
            )

        if count_filter < 0:
            raise ValueError(
                "count_filter must be a valid integer greater or equal than 0"
            )

        self._name = "count_filter_entry"
        self._count_filter = count_filter

    def _to_attr(self):
        return ":".join([self._name, str(self._count_filter)])


class ShowClickEntry(EntryAttr):
    """
    Examples:
        .. code-block:: python

            >>> import paddle
            >>> paddle.enable_static()

            >>> sparse_feature_dim = 1024
            >>> embedding_size = 64

            >>> shows = paddle.static.data(name='show', shape=[1], dtype='int64')
            >>> clicks = paddle.static.data(name='click', shape=[1], dtype='int64')
            >>> input = paddle.static.data(name='ins', shape=[1], dtype='int64')

            >>> entry = paddle.distributed.ShowClickEntry("show", "click")

            >>> emb = paddle.static.nn.sparse_embedding(
            ...     input=input,
            ...     size=[sparse_feature_dim, embedding_size],
            ...     is_test=False,
            ...     entry=entry,
            ...     param_attr=paddle.ParamAttr(
            ...         name="SparseFeatFactors",
            ...         initializer=paddle.nn.initializer.Uniform()
            ...     )
            ... )


    """

    def __init__(self, show_name, click_name):
        super().__init__()

        if not isinstance(show_name, str) or not isinstance(click_name, str):
            raise ValueError("show_name click_name must be a str")

        self._name = "show_click_entry"
        self._show_name = show_name
        self._click_name = click_name

    def _to_attr(self):
        return ":".join([self._name, self._show_name, self._click_name])