/*
 * Copyright (c) 2017 - 2018, Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#pragma once
#include "runtime/helpers/basic_math.h"
#include "CL/cl.h"
#include <utility>

namespace OCLRT {

inline int32_t selectNormalizingFactor(const cl_channel_type &channelType) {
    if (channelType == CL_UNORM_INT8) {
        return 0xFF;
    }
    if (channelType == CL_SNORM_INT8) {
        return 0x7F;
    }
    if (channelType == CL_UNORM_INT16) {
        return 0xFFFF;
    }
    if (channelType == CL_SNORM_INT16) {
        return 0x7fFF;
    }
    return 0;
}

inline void convertFillColor(const void *fillColor,
                             int32_t *iFillColor,
                             const cl_image_format &oldImageFormat,
                             const cl_image_format &newImageFormat) {
    float fFillColor[4] = {0.0f};

    for (auto i = 0; i < 4; i++) {
        iFillColor[i] = *((int32_t *)fillColor + i);
        fFillColor[i] = *((float *)fillColor + i);
    }

    if (oldImageFormat.image_channel_order == CL_A) {
        std::swap(iFillColor[0], iFillColor[3]);
        std::swap(fFillColor[0], fFillColor[3]);
    } else if (oldImageFormat.image_channel_order == CL_BGRA || oldImageFormat.image_channel_order == CL_sBGRA) {
        std::swap(iFillColor[0], iFillColor[2]);
        std::swap(fFillColor[0], fFillColor[2]);
    }

    if (oldImageFormat.image_channel_order == CL_sRGBA || oldImageFormat.image_channel_order == CL_sBGRA) {
        for (auto i = 0; i < 3; i++) {
            if (fFillColor[i] != fFillColor[i]) {
                fFillColor[i] = 0.0f;
            }
            if (fFillColor[i] > 1.0f) {
                fFillColor[i] = 1.0f;
            } else if (fFillColor[i] < 0.0f) {
                fFillColor[i] = 0.0f;
            } else if (fFillColor[i] < 0.0031308f) {
                fFillColor[i] = 12.92f * fFillColor[i];
            } else {
                fFillColor[i] = 1.055f * pow(fFillColor[i], 1.0f / 2.4f) - 0.055f;
            }
        }
    }

    if (newImageFormat.image_channel_data_type == CL_UNSIGNED_INT8) {
        auto normalizingFactor = selectNormalizingFactor(oldImageFormat.image_channel_data_type);
        if (normalizingFactor > 0) {
            for (auto i = 0; i < 4; i++) {
                if ((oldImageFormat.image_channel_order == CL_sRGBA || oldImageFormat.image_channel_order == CL_sBGRA) && i < 3) {
                    iFillColor[i] = static_cast<int32_t>(normalizingFactor * fFillColor[i] + 0.5f);
                } else {
                    iFillColor[i] = static_cast<int32_t>(normalizingFactor * fFillColor[i]);
                }
            }
        }

        for (auto i = 0; i < 4; i++) {
            iFillColor[i] = iFillColor[i] & 0xFF;
        }
    } else if (newImageFormat.image_channel_data_type == CL_UNSIGNED_INT16) {
        auto normalizingFactor = selectNormalizingFactor(oldImageFormat.image_channel_data_type);
        if (normalizingFactor > 0) {
            for (auto i = 0; i < 4; i++) {
                iFillColor[i] = static_cast<int32_t>(normalizingFactor * fFillColor[i]);
            }
        } else if (oldImageFormat.image_channel_data_type == CL_HALF_FLOAT) {
            //float to half convert.
            for (auto i = 0; i < 4; i++) {
                uint16_t temp = Math::float2Half(fFillColor[i]);
                iFillColor[i] = temp;
            }
        }

        for (auto i = 0; i < 4; i++) {
            iFillColor[i] = iFillColor[i] & 0xFFFF;
        }
    }
}
} // namespace OCLRT