/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * 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 <android/hardware_buffer.h>
#include <bufferhub/BufferHubService.h>
#include <cutils/native_handle.h>
#include <log/log.h>

namespace android {
namespace frameworks {
namespace bufferhub {
namespace V1_0 {
namespace implementation {

using hardware::Void;

Return<void> BufferHubService::allocateBuffer(const HardwareBufferDescription& description,
                                              const uint32_t userMetadataSize,
                                              allocateBuffer_cb _hidl_cb) {
    AHardwareBuffer_Desc desc;
    memcpy(&desc, &description, sizeof(AHardwareBuffer_Desc));

    std::shared_ptr<BufferNode> node =
            std::make_shared<BufferNode>(desc.width, desc.height, desc.layers, desc.format,
                                         desc.usage, userMetadataSize);
    if (node == nullptr || !node->IsValid()) {
        ALOGE("%s: creating BufferNode failed.", __FUNCTION__);
        _hidl_cb(/*bufferClient=*/nullptr, /*status=*/BufferHubStatus::ALLOCATION_FAILED);
        return Void();
    }

    sp<BufferClient> client = BufferClient::create(this, node);
    // Add it to list for bookkeeping and dumpsys.
    std::lock_guard<std::mutex> lock(mClientListMutex);
    mClientList.push_back(client);

    _hidl_cb(/*bufferClient=*/client, /*status=*/BufferHubStatus::NO_ERROR);
    return Void();
}

Return<void> BufferHubService::importBuffer(const hidl_handle& /*nativeHandle*/,
                                            importBuffer_cb _hidl_cb) {
    // TODO(b/118614157): implement buffer import
    _hidl_cb(/*bufferClient=*/nullptr, /*status=*/BufferHubStatus::NO_ERROR);
    return Void();
}

hidl_handle BufferHubService::registerToken(const BufferClient* client) {
    uint32_t token;
    std::lock_guard<std::mutex> lock(mTokenMapMutex);
    do {
        token = mTokenEngine();
    } while (mTokenMap.find(token) != mTokenMap.end());

    // native_handle_t use int[], so here need one slots to fit in uint32_t
    native_handle_t* handle = native_handle_create(/*numFds=*/0, /*numInts=*/1);
    handle->data[0] = token;

    // returnToken owns the native_handle_t* thus doing lifecycle management
    hidl_handle returnToken;
    returnToken.setTo(handle, /*shoudOwn=*/true);

    mTokenMap.emplace(token, client);
    return returnToken;
}

} // namespace implementation
} // namespace V1_0
} // namespace bufferhub
} // namespace frameworks
} // namespace android