# Copyright (c) 2021 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.

from .proto import server_configure_pb2 as server_sdk
import google.protobuf.text_format
import collections


class OpMaker(object):
    def __init__(self):
        self.op_list = [
            "GeneralInferOp",
            "GeneralReaderOp",
            "GeneralResponseOp",
            "GeneralTextReaderOp",
            "GeneralTextResponseOp",
            "GeneralSingleKVOp",
            "GeneralDistKVInferOp",
            "GeneralDistKVOp",
            "GeneralCopyOp",
            "GeneralDetectionOp",
        ]
        self.node_name_suffix_ = collections.defaultdict(int)

    def create(self, node_type, engine_name=None, inputs=[], outputs=[]):
        if node_type not in self.op_list:
            raise Exception("Op type {} is not supported right now".format(
                node_type))
        node = server_sdk.DAGNode()
        # node.name will be used as the infer engine name
        if engine_name:
            node.name = engine_name
        else:
            node.name = '{}_{}'.format(node_type,
                                       self.node_name_suffix_[node_type])
            self.node_name_suffix_[node_type] += 1

        node.type = node_type
        if inputs:
            for dep_node_str in inputs:
                dep_node = server_sdk.DAGNode()
                google.protobuf.text_format.Parse(dep_node_str, dep_node)
                dep = server_sdk.DAGNodeDependency()
                dep.name = dep_node.name
                dep.mode = "RO"
                node.dependencies.extend([dep])
        # Because the return value will be used as the key value of the
        # dict, and the proto object is variable which cannot be hashed,
        # so it is processed into a string. This has little effect on
        # overall efficiency.
        return google.protobuf.text_format.MessageToString(node)


class OpSeqMaker(object):
    def __init__(self):
        self.workflow = server_sdk.Workflow()
        self.workflow.name = "workflow1"
        self.workflow.workflow_type = "Sequence"

    def add_op(self, node_str):
        node = server_sdk.DAGNode()
        google.protobuf.text_format.Parse(node_str, node)
        if len(node.dependencies) > 1:
            raise Exception(
                'Set more than one predecessor for op in OpSeqMaker is not allowed.'
            )
        if len(self.workflow.nodes) >= 1:
            if len(node.dependencies) == 0:
                dep = server_sdk.DAGNodeDependency()
                dep.name = self.workflow.nodes[-1].name
                dep.mode = "RO"
                node.dependencies.extend([dep])
            elif len(node.dependencies) == 1:
                if node.dependencies[0].name != self.workflow.nodes[-1].name:
                    raise Exception(
                        'You must add op in order in OpSeqMaker. The previous op is {}, but the current op is followed by {}.'
                        .format(node.dependencies[0].name, self.workflow.nodes[
                            -1].name))
        self.workflow.nodes.extend([node])

    def get_op_sequence(self):
        workflow_conf = server_sdk.WorkflowConf()
        workflow_conf.workflows.extend([self.workflow])
        return workflow_conf


# TODO:Currently, SDK only supports "Sequence".OpGraphMaker is not useful.
# Config should be changed to adapt command-line for list[dict] or list[list[] ]
class OpGraphMaker(object):
    def __init__(self):
        self.workflow = server_sdk.Workflow()
        self.workflow.name = "workflow1"
        # Currently, SDK only supports "Sequence"
        self.workflow.workflow_type = "Sequence"

    def add_op(self, node_str):
        node = server_sdk.DAGNode()
        google.protobuf.text_format.Parse(node_str, node)
        self.workflow.nodes.extend([node])

    def get_op_graph(self):
        workflow_conf = server_sdk.WorkflowConf()
        workflow_conf.workflows.extend([self.workflow])
        return workflow_conf
