/*
 * Copyright (C) 2019-2020 Intel Corporation
 *
 * SPDX-License-Identifier: MIT
 *
 */

#include "level_zero/tools/source/metrics/metric.h"

#include "shared/source/os_interface/os_library.h"

#include "level_zero/core/source/device/device.h"
#include "level_zero/core/source/driver/driver.h"
#include "level_zero/core/source/driver/driver_handle_imp.h"
#include "level_zero/source/inc/ze_intel_gpu.h"
#include "level_zero/tools/source/metrics/metric_enumeration_imp.h"
#include "level_zero/tools/source/metrics/metric_query_imp.h"

#include <map>
#include <utility>

namespace L0 {

struct MetricGroupDomains {

  public:
    MetricGroupDomains(MetricContext &metricContext);
    ze_result_t activateDeferred(const uint32_t count, zet_metric_group_handle_t *phMetricGroups);
    ze_result_t activate();
    ze_result_t deactivate();
    bool isActivated(const zet_metric_group_handle_t hMetricGroup);

  protected:
    bool activateMetricGroupDeffered(const zet_metric_group_handle_t hMetricGroup);
    bool activateEventMetricGroup(const zet_metric_group_handle_t hMetricGroup);

  protected:
    MetricsLibrary &metricsLibrary;

    // Map holds activated domains and associated metric groups.
    // Content: <domain number, pair<metric group, is activated on gpu flag>
    std::map<uint32_t, std::pair<zet_metric_group_handle_t, bool>> domains;
};

struct MetricContextImp : public MetricContext {
  public:
    MetricContextImp(Device &device);
    ~MetricContextImp() override;

    bool loadDependencies() override;
    bool isInitialized() override;
    void setInitializationState(const ze_result_t state) override;
    Device &getDevice() override;
    MetricsLibrary &getMetricsLibrary() override;
    MetricEnumeration &getMetricEnumeration() override;
    MetricTracer *getMetricTracer() override;
    void setMetricTracer(MetricTracer *pMetricTracer) override;
    void setMetricsLibrary(MetricsLibrary &metricsLibrary) override;
    void setMetricEnumeration(MetricEnumeration &metricEnumeration) override;

    ze_result_t activateMetricGroups() override;
    ze_result_t activateMetricGroupsDeferred(const uint32_t count,
                                             zet_metric_group_handle_t *phMetricGroups) override;
    bool isMetricGroupActivated(const zet_metric_group_handle_t hMetricGroup) override;

    void setUseCompute(const bool useCompute) override;
    bool isComputeUsed() override;

  protected:
    ze_result_t initializationState = ZE_RESULT_ERROR_UNINITIALIZED;
    struct Device &device;
    std::unique_ptr<MetricEnumeration> metricEnumeration = nullptr;
    std::unique_ptr<MetricsLibrary> metricsLibrary = nullptr;
    MetricGroupDomains metricGroupDomains;
    MetricTracer *pMetricTracer = nullptr;
    bool useCompute = false;
};

MetricContextImp::MetricContextImp(Device &deviceInput)
    : device(deviceInput),
      metricEnumeration(std::unique_ptr<MetricEnumeration>(new (std::nothrow) MetricEnumeration(*this))),
      metricsLibrary(std::unique_ptr<MetricsLibrary>(new (std::nothrow) MetricsLibrary(*this))),
      metricGroupDomains(*this) {
}

MetricContextImp::~MetricContextImp() {
    metricsLibrary.reset();
    metricEnumeration.reset();
}

bool MetricContextImp::loadDependencies() {
    bool result = true;
    if (metricEnumeration->loadMetricsDiscovery() != ZE_RESULT_SUCCESS) {
        result = false;
        DEBUG_BREAK_IF(!result);
    }
    if (result && !metricsLibrary->load()) {
        result = false;
        DEBUG_BREAK_IF(!result);
    }
    if (result) {
        setInitializationState(ZE_RESULT_SUCCESS);
    }
    return result;
}

bool MetricContextImp::isInitialized() {
    return initializationState == ZE_RESULT_SUCCESS;
}

void MetricContextImp::setInitializationState(const ze_result_t state) {
    initializationState = state;
}

Device &MetricContextImp::getDevice() { return device; }

MetricsLibrary &MetricContextImp::getMetricsLibrary() { return *metricsLibrary; }

MetricEnumeration &MetricContextImp::getMetricEnumeration() { return *metricEnumeration; }

MetricTracer *MetricContextImp::getMetricTracer() { return pMetricTracer; }

void MetricContextImp::setMetricTracer(MetricTracer *pMetricTracer) {
    this->pMetricTracer = pMetricTracer;
}

void MetricContextImp::setMetricsLibrary(MetricsLibrary &metricsLibrary) {
    this->metricsLibrary.release();
    this->metricsLibrary.reset(&metricsLibrary);
}

void MetricContextImp::setMetricEnumeration(MetricEnumeration &metricEnumeration) {
    this->metricEnumeration.release();
    this->metricEnumeration.reset(&metricEnumeration);
}

void MetricContextImp::setUseCompute(const bool useCompute) {
    this->useCompute = useCompute;
}

bool MetricContextImp::isComputeUsed() {
    return useCompute;
}

ze_result_t
MetricContextImp::activateMetricGroupsDeferred(const uint32_t count,
                                               zet_metric_group_handle_t *phMetricGroups) {

    // Activation: postpone until zetMetricTracerOpen or zeCommandQueueExecuteCommandLists
    // Deactivation: execute immediately.
    return phMetricGroups ? metricGroupDomains.activateDeferred(count, phMetricGroups)
                          : metricGroupDomains.deactivate();
}

bool MetricContextImp::isMetricGroupActivated(const zet_metric_group_handle_t hMetricGroup) {
    return metricGroupDomains.isActivated(hMetricGroup);
}

ze_result_t MetricContextImp::activateMetricGroups() { return metricGroupDomains.activate(); }

void MetricContext::enableMetricApi(ze_result_t &result) {
    if (!getenv_tobool("ZE_ENABLE_METRICS")) {
        result = ZE_RESULT_SUCCESS;
        return;
    }

    if (!isMetricApiAvailable()) {
        result = ZE_RESULT_ERROR_UNKNOWN;
        return;
    }

    DriverHandle *driverHandle = L0::DriverHandle::fromHandle(GlobalDriver.get());

    uint32_t count = 0;
    result = driverHandle->getDevice(&count, nullptr);
    if (result != ZE_RESULT_SUCCESS) {
        result = ZE_RESULT_ERROR_UNKNOWN;
        return;
    }

    std::vector<ze_device_handle_t> devices(count);
    result = driverHandle->getDevice(&count, devices.data());
    if (result != ZE_RESULT_SUCCESS) {
        result = ZE_RESULT_ERROR_UNKNOWN;
        return;
    }

    for (auto deviceHandle : devices) {
        Device *device = L0::Device::fromHandle(deviceHandle);
        if (!device->getMetricContext().loadDependencies()) {
            result = ZE_RESULT_ERROR_UNKNOWN;
            return;
        }
    }
}

std::unique_ptr<MetricContext> MetricContext::create(Device &device) {
    auto metricContextImp = new (std::nothrow) MetricContextImp(device);
    std::unique_ptr<MetricContext> metricContext{metricContextImp};
    return metricContext;
}

bool MetricContext::isMetricApiAvailable() {

    std::unique_ptr<NEO::OsLibrary> library = nullptr;

    // Check Metrics Discovery availability.
    library.reset(NEO::OsLibrary::load(MetricEnumeration::getMetricsDiscoveryFilename()));
    if (library == nullptr) {
        return false;
    }

    // Check Metrics Library availability.
    library.reset(NEO::OsLibrary::load(MetricsLibrary::getFilename()));
    if (library == nullptr) {
        return false;
    }

    return true;
}

MetricGroupDomains::MetricGroupDomains(MetricContext &metricContext)
    : metricsLibrary(metricContext.getMetricsLibrary()) {}

ze_result_t MetricGroupDomains::activateDeferred(const uint32_t count,
                                                 zet_metric_group_handle_t *phMetricGroups) {
    // For each metric group:
    for (uint32_t i = 0; i < count; ++i) {
        DEBUG_BREAK_IF(!phMetricGroups[i]);

        // Try to associate it with a domain (oa, ...).
        if (!activateMetricGroupDeffered(phMetricGroups[i])) {
            return ZE_RESULT_ERROR_UNKNOWN;
        }
    }

    return ZE_RESULT_SUCCESS;
}

bool MetricGroupDomains::activateMetricGroupDeffered(const zet_metric_group_handle_t hMetricGroup) {

    const auto properites = MetricGroup::getProperties(hMetricGroup);
    const auto domain = properites.domain;

    const bool isDomainFree = domains[domain].first == nullptr;
    const bool isSameGroup = domains[domain].first == hMetricGroup;

    // The same metric group has been already associated.
    if (isSameGroup) {
        return true;
    }

    // Domain has been already associated with a different metric group.
    if (!isDomainFree) {
        return false;
    }

    // Associate metric group with domain and mark it as not active.
    // Activation will be performed during zeCommandQueueExecuteCommandLists (query)
    // or zetMetricTracerOpen (time based sampling).
    domains[domain].first = hMetricGroup;
    domains[domain].second = false;

    return true;
}

ze_result_t MetricGroupDomains::activate() {

    // For each domain.
    for (auto &domain : domains) {

        auto hMetricGroup = domain.second.first;
        bool &metricGroupActive = domain.second.second;
        bool metricGroupEventBased =
            hMetricGroup && MetricGroup::getProperties(hMetricGroup).samplingType ==
                                ZET_METRIC_GROUP_SAMPLING_TYPE_EVENT_BASED;

        // Activate only event based metric groups.
        // Time based metric group will be activated during zetMetricTracerOpen.
        if (metricGroupEventBased && !metricGroupActive) {

            metricGroupActive = activateEventMetricGroup(hMetricGroup);

            if (metricGroupActive == false) {
                DEBUG_BREAK_IF(true);
                return ZE_RESULT_ERROR_UNKNOWN;
            }
        }
    }

    return ZE_RESULT_SUCCESS;
}

bool MetricGroupDomains::activateEventMetricGroup(const zet_metric_group_handle_t hMetricGroup) {
    // Obtain metric group configuration handle from metrics library.
    auto hConfiguration = metricsLibrary.getConfiguration(hMetricGroup);

    // Validate metrics library handle.
    if (!hConfiguration.IsValid()) {
        DEBUG_BREAK_IF(true);
        return false;
    }

    // Write metric group configuration to gpu.
    const bool result = metricsLibrary.activateConfiguration(hConfiguration);

    DEBUG_BREAK_IF(!result);
    return result;
}

ze_result_t MetricGroupDomains::deactivate() {
    // Deactivate metric group for each domain.
    for (auto &domain : domains) {

        auto hMetricGroup = domain.second.first;
        auto metricGroup = MetricGroup::fromHandle(hMetricGroup);
        bool metricGroupActivated = domain.second.second;
        auto metricGroupEventBased = (metricGroup != nullptr)
                                         ? MetricGroup::getProperties(hMetricGroup).samplingType == ZET_METRIC_GROUP_SAMPLING_TYPE_EVENT_BASED
                                         : false;
        auto hConfigurationEmpty = ConfigurationHandle_1_0{};
        auto hConfiguration = metricGroupEventBased
                                  ? metricsLibrary.getConfiguration(hMetricGroup)
                                  : hConfigurationEmpty;

        // Deactivate metric group configuration using metrics library.
        if (hConfiguration.IsValid() && metricGroupActivated) {
            metricsLibrary.deactivateConfiguration(hConfiguration);
        }

        // Mark domain as free.
        domain.second = {};
    }

    return ZE_RESULT_SUCCESS;
}

bool MetricGroupDomains::isActivated(const zet_metric_group_handle_t hMetricGroup) {
    auto metricGroupProperties = MetricGroup::getProperties(hMetricGroup);

    // 1. Check whether domain is activated.
    const auto domain = domains.find(metricGroupProperties.domain);
    if (domain == domains.end()) {
        return false;
    }

    // 2. Check whether the specific MetricGroup is activated.
    return domain->second.first == hMetricGroup;
}

ze_result_t metricGroupGet(zet_device_handle_t hDevice, uint32_t *pCount, zet_metric_group_handle_t *phMetricGroups) {
    auto device = Device::fromHandle(hDevice);
    return device->getMetricContext().getMetricEnumeration().metricGroupGet(*pCount,
                                                                            phMetricGroups);
}

ze_result_t metricTracerOpen(zet_device_handle_t hDevice, zet_metric_group_handle_t hMetricGroup,
                             zet_metric_tracer_desc_t *pDesc, ze_event_handle_t hNotificationEvent,
                             zet_metric_tracer_handle_t *phMetricTracer) {
    *phMetricTracer = MetricTracer::open(hDevice, hMetricGroup, *pDesc, hNotificationEvent);

    return (*phMetricTracer != nullptr) ? ZE_RESULT_SUCCESS : ZE_RESULT_ERROR_UNKNOWN;
}

} // namespace L0