// Tencent is pleased to support the open source community by making TNN available.
//
// Copyright (C) 2020 THL A29 Limited, a Tencent company. All rights reserved.
//
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// https://opensource.org/licenses/BSD-3-Clause
//
// 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 "cpu_layer_acc.h"
#include "tnn/utils/data_type_utils.h"
#include "tnn/utils/dims_utils.h"

namespace TNN_NS {

DECLARE_CPU_ACC(Histogram, LAYER_HISTOGRAM);

Status CpuHistogramLayerAcc::Reshape(const std::vector<Blob *> &inputs, const std::vector<Blob *> &outputs) {
    return TNN_OK;
}

Status CpuHistogramLayerAcc::Forward(const std::vector<Blob *> &inputs, const std::vector<Blob *> &outputs) {
    auto input_data_type  = inputs[0]->GetBlobDesc().data_type;
    auto input_data     = (int *)((char *)inputs[0]->GetHandle().base + inputs[0]->GetHandle().bytes_offset);
    auto output_data     = (int *)((char *)outputs[0]->GetHandle().base + outputs[0]->GetHandle().bytes_offset);

    const int ele_size = DataTypeUtils::GetBytesSize(outputs[0]->GetBlobDesc().data_type);
    const int count = DimsVectorUtils::Count(inputs[0]->GetBlobDesc().dims);
    
    memset(output_data, 0, ele_size*DimsVectorUtils::Count(outputs[0]->GetBlobDesc().dims));
    if (input_data_type == DATA_TYPE_INT32) {
        for (int i = 0; i < count; ++i) {
            auto index = input_data[i];
            output_data[index] = output_data[index] + 1;
        }
    } else {
        LOGE("unsupport data type to Histogram\n");
    }
    return TNN_OK;
}

REGISTER_CPU_ACC(Histogram, LAYER_HISTOGRAM);
}  // namespace TNN_NS
