/*
 * Copyright (C) 2017 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.
 */

#ifndef ANDROID_FRAMEWORKS_ML_NN_DRIVER_SAMPLE_SAMPLE_DRIVER_H
#define ANDROID_FRAMEWORKS_ML_NN_DRIVER_SAMPLE_SAMPLE_DRIVER_H

#include <hwbinder/IPCThreadState.h>

#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "BufferTracker.h"
#include "CpuExecutor.h"
#include "HalInterfaces.h"
#include "NeuralNetworks.h"

namespace android {
namespace nn {
namespace sample_driver {

using hardware::MQDescriptorSync;

// Manages the data buffer for an operand.
class SampleBuffer : public hal::IBuffer {
   public:
    SampleBuffer(std::shared_ptr<ManagedBuffer> buffer, std::unique_ptr<BufferTracker::Token> token)
        : kBuffer(std::move(buffer)), kToken(std::move(token)) {
        CHECK(kBuffer != nullptr);
        CHECK(kToken != nullptr);
    }
    hal::Return<hal::ErrorStatus> copyTo(const hal::hidl_memory& dst) override;
    hal::Return<hal::ErrorStatus> copyFrom(const hal::hidl_memory& src,
                                           const hal::hidl_vec<uint32_t>& dimensions) override;

   private:
    const std::shared_ptr<ManagedBuffer> kBuffer;
    const std::unique_ptr<BufferTracker::Token> kToken;
};

// Base class used to create sample drivers for the NN HAL.  This class
// provides some implementation of the more common functions.
//
// Since these drivers simulate hardware, they must run the computations
// on the CPU.  An actual driver would not do that.
class SampleDriver : public hal::IDevice {
   public:
    SampleDriver(const char* name,
                 const IOperationResolver* operationResolver = BuiltinOperationResolver::get())
        : mName(name),
          mOperationResolver(operationResolver),
          mBufferTracker(BufferTracker::create()) {
        android::nn::initVLogMask();
    }
    hal::Return<void> getCapabilities(getCapabilities_cb cb) override;
    hal::Return<void> getCapabilities_1_1(getCapabilities_1_1_cb cb) override;
    hal::Return<void> getCapabilities_1_2(getCapabilities_1_2_cb cb) override;
    hal::Return<void> getVersionString(getVersionString_cb cb) override;
    hal::Return<void> getType(getType_cb cb) override;
    hal::Return<void> getSupportedExtensions(getSupportedExtensions_cb) override;
    hal::Return<void> getSupportedOperations(const hal::V1_0::Model& model,
                                             getSupportedOperations_cb cb) override;
    hal::Return<void> getSupportedOperations_1_1(const hal::V1_1::Model& model,
                                                 getSupportedOperations_1_1_cb cb) override;
    hal::Return<void> getSupportedOperations_1_2(const hal::V1_2::Model& model,
                                                 getSupportedOperations_1_2_cb cb) override;
    hal::Return<void> getNumberOfCacheFilesNeeded(getNumberOfCacheFilesNeeded_cb cb) override;
    hal::Return<hal::V1_0::ErrorStatus> prepareModel(
            const hal::V1_0::Model& model,
            const sp<hal::V1_0::IPreparedModelCallback>& callback) override;
    hal::Return<hal::V1_0::ErrorStatus> prepareModel_1_1(
            const hal::V1_1::Model& model, hal::ExecutionPreference preference,
            const sp<hal::V1_0::IPreparedModelCallback>& callback) override;
    hal::Return<hal::V1_0::ErrorStatus> prepareModel_1_2(
            const hal::V1_2::Model& model, hal::ExecutionPreference preference,
            const hal::hidl_vec<hal::hidl_handle>& modelCache,
            const hal::hidl_vec<hal::hidl_handle>& dataCache, const hal::CacheToken& token,
            const sp<hal::V1_2::IPreparedModelCallback>& callback) override;
    hal::Return<hal::V1_3::ErrorStatus> prepareModel_1_3(
            const hal::V1_3::Model& model, hal::ExecutionPreference preference,
            hal::Priority priority, const hal::OptionalTimePoint& deadline,
            const hal::hidl_vec<hal::hidl_handle>& modelCache,
            const hal::hidl_vec<hal::hidl_handle>& dataCache, const hal::CacheToken& token,
            const sp<hal::V1_3::IPreparedModelCallback>& callback) override;
    hal::Return<hal::V1_0::ErrorStatus> prepareModelFromCache(
            const hal::hidl_vec<hal::hidl_handle>& modelCache,
            const hal::hidl_vec<hal::hidl_handle>& dataCache, const hal::CacheToken& token,
            const sp<hal::V1_2::IPreparedModelCallback>& callback) override;
    hal::Return<hal::V1_3::ErrorStatus> prepareModelFromCache_1_3(
            const hal::OptionalTimePoint& deadline,
            const hal::hidl_vec<hal::hidl_handle>& modelCache,
            const hal::hidl_vec<hal::hidl_handle>& dataCache, const hal::CacheToken& token,
            const sp<hal::V1_3::IPreparedModelCallback>& callback) override;
    hal::Return<hal::DeviceStatus> getStatus() override;
    hal::Return<void> allocate(const hal::V1_3::BufferDesc& desc,
                               const hal::hidl_vec<sp<hal::V1_3::IPreparedModel>>& preparedModels,
                               const hal::hidl_vec<hal::V1_3::BufferRole>& inputRoles,
                               const hal::hidl_vec<hal::V1_3::BufferRole>& outputRoles,
                               allocate_cb cb) override;

    // Starts and runs the driver service.  Typically called from main().
    // This will return only once the service shuts down.
    int run();

    CpuExecutor getExecutor() const { return CpuExecutor(mOperationResolver); }
    const std::shared_ptr<BufferTracker>& getBufferTracker() const { return mBufferTracker; }

   protected:
    std::string mName;
    const IOperationResolver* mOperationResolver;
    const std::shared_ptr<BufferTracker> mBufferTracker;
};

class SamplePreparedModel : public hal::IPreparedModel {
   public:
    SamplePreparedModel(const hal::Model& model, const SampleDriver* driver,
                        hal::ExecutionPreference preference, uid_t userId, hal::Priority priority)
        : mModel(model),
          mDriver(driver),
          kPreference(preference),
          kUserId(userId),
          kPriority(priority) {
        (void)kUserId;
        (void)kPriority;
    }
    bool initialize();
    hal::Return<hal::V1_0::ErrorStatus> execute(
            const hal::V1_0::Request& request,
            const sp<hal::V1_0::IExecutionCallback>& callback) override;
    hal::Return<hal::V1_0::ErrorStatus> execute_1_2(
            const hal::V1_0::Request& request, hal::MeasureTiming measure,
            const sp<hal::V1_2::IExecutionCallback>& callback) override;
    hal::Return<hal::V1_3::ErrorStatus> execute_1_3(
            const hal::V1_3::Request& request, hal::MeasureTiming measure,
            const hal::OptionalTimePoint& deadline,
            const hal::OptionalTimeoutDuration& loopTimeoutDuration,
            const sp<hal::V1_3::IExecutionCallback>& callback) override;
    hal::Return<void> executeSynchronously(const hal::V1_0::Request& request,
                                           hal::MeasureTiming measure,
                                           executeSynchronously_cb cb) override;
    hal::Return<void> executeSynchronously_1_3(
            const hal::V1_3::Request& request, hal::MeasureTiming measure,
            const hal::OptionalTimePoint& deadline,
            const hal::OptionalTimeoutDuration& loopTimeoutDuration,
            executeSynchronously_1_3_cb cb) override;
    hal::Return<void> configureExecutionBurst(
            const sp<hal::V1_2::IBurstCallback>& callback,
            const MQDescriptorSync<hal::V1_2::FmqRequestDatum>& requestChannel,
            const MQDescriptorSync<hal::V1_2::FmqResultDatum>& resultChannel,
            configureExecutionBurst_cb cb) override;
    hal::Return<void> executeFenced(const hal::Request& request,
                                    const hal::hidl_vec<hal::hidl_handle>& wait_for,
                                    hal::MeasureTiming measure,
                                    const hal::OptionalTimePoint& deadline,
                                    const hal::OptionalTimeoutDuration& loopTimeoutDuration,
                                    const hal::OptionalTimeoutDuration& duration,
                                    executeFenced_cb callback) override;
    const hal::Model* getModel() const { return &mModel; }

   private:
    hal::Model mModel;
    const SampleDriver* mDriver;
    std::vector<RunTimePoolInfo> mPoolInfos;
    const hal::ExecutionPreference kPreference;
    const uid_t kUserId;
    const hal::Priority kPriority;
};

class SampleFencedExecutionCallback : public hal::IFencedExecutionCallback {
   public:
    SampleFencedExecutionCallback(hal::Timing timingSinceLaunch, hal::Timing timingAfterFence,
                                  hal::ErrorStatus error)
        : kTimingSinceLaunch(timingSinceLaunch),
          kTimingAfterFence(timingAfterFence),
          kErrorStatus(error) {}
    hal::Return<void> getExecutionInfo(getExecutionInfo_cb callback) override {
        callback(kErrorStatus, kTimingSinceLaunch, kTimingAfterFence);
        return hal::Void();
    }

   private:
    const hal::Timing kTimingSinceLaunch;
    const hal::Timing kTimingAfterFence;
    const hal::ErrorStatus kErrorStatus;
};

}  // namespace sample_driver
}  // namespace nn
}  // namespace android

#endif  // ANDROID_FRAMEWORKS_ML_NN_DRIVER_SAMPLE_SAMPLE_DRIVER_H