/*
// Copyright (c) 2016-2019 Intel Corporation
//
// 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.
*/

///////////////////////////////////////////////////////////////////////////////////////////////////
#include "fully_connected_inst.h"
#include "primitive_type_base.h"
#include "error_handler.h"
#include "json_object.h"

namespace cldnn
{
primitive_type_id fully_connected_type_id()
{
    static primitive_type_base<fully_connected> instance;
    return &instance;
}

namespace
{
bool is_batch_after_spatial(const std::string order)
{
    bool spatial_found = false;
    for (auto c : order)
    {
        switch (c)
        {
        case 'b':
        case 'n':
            return spatial_found;

        case 'x':
        case 'y':
        case 'z':
        case 'w':
        case 's':
            spatial_found = true;
            break;

        default: break;
        }
    }
    return false;
}
}

layout fully_connected_inst::calc_output_layout(fully_connected_node const& node)
{
    assert((bool)node.get_primitive()->output_data_type == false
           && "Output data type forcing is not supported for "
              "fully_connected_node!");
    auto desc = node.get_primitive();
    
    auto input_layout = node.input().get_output_layout();
    auto weights_layout = node.weights().get_output_layout();

    if(is_batch_after_spatial(input_layout.format.order()) || 
        (input_layout.format == format::bfyx &&                //this condition tests whether our input is batch>1 in bfyx format, if yes there will be
        input_layout.size.batch[0] > 1))                            //extra reorder between input and this fc from bfyx to yxfb format (so "is_batch_after_spatial" should return true)
    {
        auto result = layout(input_layout.data_type, format::yxfb, tensor(input_layout.size.batch[0], weights_layout.size.batch[0], 1, 1));
        return result;
    }
    else
    {
        auto result = layout(input_layout.data_type, format::bfyx, tensor(input_layout.size.batch[0], weights_layout.size.batch[0], 1, 1));
        return result;
    }
}

std::string fully_connected_inst::to_string(fully_connected_node const& node)
{
    auto desc       = node.get_primitive();
    auto node_info  = node.desc_to_json();
    auto bias_id    = desc->bias != "" ? desc->bias : "no bias";
    auto weights_id = desc->weights;
    auto activation = desc->with_activation ? " true" : "false";

    std::stringstream primitive_description;

    json_composite fc_info;
    fc_info.add("weights id", weights_id);
    fc_info.add("bias id", bias_id);
    fc_info.add("with activation", activation);

    node_info->add("fully connected info", fc_info);
    node_info->dump(primitive_description);

    return primitive_description.str();
}

fully_connected_inst::typed_primitive_inst(network_impl& network, fully_connected_node const& node)
    :parent(network, node)
{
    auto input_layout = node.input().get_output_layout();
    auto output_layout = node.get_output_layout();

    CLDNN_ERROR_NOT_PROPER_FORMAT(node.id(), "input format", input_layout.format.value, "expected format", format::yxfb, format::bfyx, format::byxf_af32, format::fs_bs_yx_bsv4_fsv32, format::b_fs_yx_fsv4);
    CLDNN_ERROR_NOT_EQUAL(node.id(), "Input size", input_layout.size.raw.size(), "output size", output_layout.size.raw.size(), "");
}
}
