/*
 *
 *    Copyright (c) 2021 Project CHIP Authors
 *
 *    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.
 */

/**
 *    @file
 *          Defines the public interface for the Device Layer DiagnosticDataProvider object.
 */

#pragma once

#include <app-common/zap-generated/cluster-objects.h>
#include <inet/InetInterface.h>
#include <lib/core/ClusterEnums.h>
#include <platform/CHIPDeviceConfig.h>
#include <platform/GeneralFaults.h>

namespace chip {
namespace DeviceLayer {

// Maximum length of vendor defined name or prefix of the software thread that is
// static for the duration of the thread.
static constexpr size_t kMaxThreadNameLength = 8;

// 48-bit IEEE MAC Address or a 64-bit IEEE MAC Address (e.g. EUI-64).
inline constexpr size_t kMaxHardwareAddrSize = 8;

inline constexpr size_t kMaxIPv4AddrSize  = 4;
inline constexpr size_t kMaxIPv6AddrSize  = 16;
inline constexpr size_t kMaxIPv4AddrCount = 4;
inline constexpr size_t kMaxIPv6AddrCount = 8;

using BootReasonType = app::Clusters::GeneralDiagnostics::BootReasonEnum;

struct ThreadMetrics : public app::Clusters::SoftwareDiagnostics::Structs::ThreadMetricsStruct::Type
{
    char NameBuf[kMaxThreadNameLength + 1];
    ThreadMetrics * Next; /* Pointer to the next structure.  */
};

struct NetworkInterface : public app::Clusters::GeneralDiagnostics::Structs::NetworkInterface::Type
{
    char Name[Inet::InterfaceId::kMaxIfNameLength];
    uint8_t MacAddress[kMaxHardwareAddrSize];
    uint8_t Ipv4AddressesBuffer[kMaxIPv4AddrCount][kMaxIPv4AddrSize];
    uint8_t Ipv6AddressesBuffer[kMaxIPv6AddrCount][kMaxIPv6AddrSize];
    chip::ByteSpan Ipv4AddressSpans[kMaxIPv4AddrCount];
    chip::ByteSpan Ipv6AddressSpans[kMaxIPv6AddrCount];
    NetworkInterface * Next; /* Pointer to the next structure.  */
};

class DiagnosticDataProviderImpl;

/**
 * Defines the WiFi Diagnostics Delegate class to notify WiFi network events.
 */
class WiFiDiagnosticsDelegate
{
public:
    virtual ~WiFiDiagnosticsDelegate() {}

    /**
     * @brief
     *   Called when the Node detects Node’s Wi-Fi connection has been disconnected.
     */
    virtual void OnDisconnectionDetected(uint16_t reasonCode) {}

    /**
     * @brief
     *   Called when the Node fails to associate or authenticate an access point.
     */
    virtual void OnAssociationFailureDetected(uint8_t associationFailureCause, uint16_t status) {}

    /**
     * @brief
     *   Called when the Node’s connection status to a Wi-Fi network has changed.
     */
    virtual void OnConnectionStatusChanged(uint8_t connectionStatus) {}
};

/**
 * Defines the Thread Diagnostics Delegate class to notify Thread network events.
 */
class ThreadDiagnosticsDelegate
{
public:
    virtual ~ThreadDiagnosticsDelegate() {}

    /**
     * @brief
     *   Called when the Node’s connection status to a Thread network has changed.
     */
    virtual void OnConnectionStatusChanged(app::Clusters::ThreadNetworkDiagnostics::ConnectionStatusEnum newConnectionStatus) {}

    /**
     * @brief
     *   Called when the Node detects change in the set of current Thread network faults.
     */
    virtual void OnNetworkFaultChanged(const GeneralFaults<kMaxNetworkFaults> & previous,
                                       const GeneralFaults<kMaxNetworkFaults> & current)
    {}
};

/**
 * Provides access to runtime and build-time configuration information for a chip device.
 */
class DiagnosticDataProvider
{
public:
    void SetWiFiDiagnosticsDelegate(WiFiDiagnosticsDelegate * delegate) { mWiFiDiagnosticsDelegate = delegate; }
    WiFiDiagnosticsDelegate * GetWiFiDiagnosticsDelegate() const { return mWiFiDiagnosticsDelegate; }
    void SetThreadDiagnosticsDelegate(ThreadDiagnosticsDelegate * delegate) { mThreadDiagnosticsDelegate = delegate; }
    ThreadDiagnosticsDelegate * GetThreadDiagnosticsDelegate() const { return mThreadDiagnosticsDelegate; }

    /**
     * General Diagnostics methods.
     */

    /**
     * @brief Obtain the number of times the node has rebooted.
     *        The reboot count value will be reset only upon a factory reset of the node.
     *
     * @param[out] rebootCount Reference to location where the reboot count integer will be copied.
     */
    virtual CHIP_ERROR GetRebootCount(uint16_t & rebootCount);

    /**
     * @brief Obtain the time (in seconds) since the node's last reboot.
     *        The up time value will be reset upon a node reboot.
     *
     * @param[out] upTime Reference to location where the up time integer will be copied.
     */
    virtual CHIP_ERROR GetUpTime(uint64_t & upTime);

    /**
     * @brief Obtain the total time (in hours) the node has been operational.
     *        The total operational hours value will be reset only upon a factory reset of the node.
     *
     * @param[out] totalOperationalHours Reference to location where the total operation hours integer will be copied.
     */
    virtual CHIP_ERROR GetTotalOperationalHours(uint32_t & totalOperationalHours);

    /**
     * @brief Obtain the reason for the node's most recent reboot.
     *
     * @param[out] bootReason Reference to location where the boot reason enum value will be copied.
     */
    virtual CHIP_ERROR GetBootReason(BootReasonType & bootReason);

    /**
     * @brief Obtain the set of hardware faults currently detected by the node.
     *
     * @param[out] hardwareFaults Reference to location of a GeneralFaults instance.
     *                            The instance can be populated by sequentially calling add method.
     */
    virtual CHIP_ERROR GetActiveHardwareFaults(GeneralFaults<kMaxHardwareFaults> & hardwareFaults);

    /**
     * @brief Obtain the set of radio faults currently detected by the node.
     *
     * @param[out] radioFaults Reference to location of a GeneralFaults instance.
     *                         The instance can be populated by sequentially calling add method.
     */
    virtual CHIP_ERROR GetActiveRadioFaults(GeneralFaults<kMaxRadioFaults> & radioFaults);

    /**
     * @brief Obtain the set of network faults currently detected by the node.
     *
     * @param[out] networkFaults Reference to location of a GeneralFaults instance.
     *                           The instance can be populated by sequentially calling add method.
     */
    virtual CHIP_ERROR GetActiveNetworkFaults(GeneralFaults<kMaxNetworkFaults> & networkFaults);

    /**
     * @brief Obtain the average wear count of the node's persistent storage backend.
     *
     * @param[out] averageWearCount Reference to location where the average wear count integer will be copied.
     */
    virtual CHIP_ERROR GetAverageWearCount(uint32_t & averageWearCount);

    /*
     * Get the linked list of network interfaces of the current plaform. After usage, each caller of GetNetworkInterfaces
     * needs to release the network interface list it gets via ReleaseNetworkInterfaces.
     *
     */
    virtual CHIP_ERROR GetNetworkInterfaces(NetworkInterface ** netifpp);
    virtual void ReleaseNetworkInterfaces(NetworkInterface * netifp);

    /**
     * Software Diagnostics methods.
     */

    /// Feature support - this returns support gor GetCurrentHeapHighWatermark and ResetWatermarks()
    virtual bool SupportsWatermarks() { return false; }

    virtual CHIP_ERROR GetCurrentHeapFree(uint64_t & currentHeapFree);
    virtual CHIP_ERROR GetCurrentHeapUsed(uint64_t & currentHeapUsed);
    virtual CHIP_ERROR GetCurrentHeapHighWatermark(uint64_t & currentHeapHighWatermark);
    virtual CHIP_ERROR ResetWatermarks();

    /*
     * Get the linked list of thread metrics of the current plaform. After usage, each caller of GetThreadMetrics
     * needs to release the thread metrics list it gets via ReleaseThreadMetrics.
     *
     */
    virtual CHIP_ERROR GetThreadMetrics(ThreadMetrics ** threadMetricsOut);
    virtual void ReleaseThreadMetrics(ThreadMetrics * threadMetrics);

    /**
     * Ethernet network diagnostics methods
     */
    virtual CHIP_ERROR GetEthPHYRate(app::Clusters::EthernetNetworkDiagnostics::PHYRateEnum & pHYRate);
    virtual CHIP_ERROR GetEthFullDuplex(bool & fullDuplex);
    virtual CHIP_ERROR GetEthCarrierDetect(bool & carrierDetect);
    virtual CHIP_ERROR GetEthTimeSinceReset(uint64_t & timeSinceReset);
    virtual CHIP_ERROR GetEthPacketRxCount(uint64_t & packetRxCount);
    virtual CHIP_ERROR GetEthPacketTxCount(uint64_t & packetTxCount);
    virtual CHIP_ERROR GetEthTxErrCount(uint64_t & txErrCount);
    virtual CHIP_ERROR GetEthCollisionCount(uint64_t & collisionCount);
    virtual CHIP_ERROR GetEthOverrunCount(uint64_t & overrunCount);
    virtual CHIP_ERROR ResetEthNetworkDiagnosticsCounts();

    /**
     * WiFi network diagnostics methods
     */

    /**
     * The MutableByteSpan provided to GetWiFiBssId must have size at least
     * kMaxHardwareAddrSize. Its size will be set to the actual size of the
     * BSSID.
     */
    virtual CHIP_ERROR GetWiFiBssId(MutableByteSpan & value);
    virtual CHIP_ERROR GetWiFiSecurityType(app::Clusters::WiFiNetworkDiagnostics::SecurityTypeEnum & securityType);
    virtual CHIP_ERROR GetWiFiVersion(app::Clusters::WiFiNetworkDiagnostics::WiFiVersionEnum & wiFiVersion);
    virtual CHIP_ERROR GetWiFiChannelNumber(uint16_t & channelNumber);
    virtual CHIP_ERROR GetWiFiRssi(int8_t & rssi);
    virtual CHIP_ERROR GetWiFiBeaconLostCount(uint32_t & beaconLostCount);
    virtual CHIP_ERROR GetWiFiBeaconRxCount(uint32_t & beaconRxCount);
    virtual CHIP_ERROR GetWiFiPacketMulticastRxCount(uint32_t & packetMulticastRxCount);
    virtual CHIP_ERROR GetWiFiPacketMulticastTxCount(uint32_t & packetMulticastTxCount);
    virtual CHIP_ERROR GetWiFiPacketUnicastRxCount(uint32_t & packetUnicastRxCount);
    virtual CHIP_ERROR GetWiFiPacketUnicastTxCount(uint32_t & packetUnicastTxCount);
    virtual CHIP_ERROR GetWiFiCurrentMaxRate(uint64_t & currentMaxRate);
    virtual CHIP_ERROR GetWiFiOverrunCount(uint64_t & overrunCount);
    virtual CHIP_ERROR ResetWiFiNetworkDiagnosticsCounts();

protected:
    // Construction/destruction limited to subclasses.
    DiagnosticDataProvider()          = default;
    virtual ~DiagnosticDataProvider() = default;

private:
    WiFiDiagnosticsDelegate * mWiFiDiagnosticsDelegate     = nullptr;
    ThreadDiagnosticsDelegate * mThreadDiagnosticsDelegate = nullptr;

    // No copy, move or assignment.
    DiagnosticDataProvider(const DiagnosticDataProvider &)             = delete;
    DiagnosticDataProvider(const DiagnosticDataProvider &&)            = delete;
    DiagnosticDataProvider & operator=(const DiagnosticDataProvider &) = delete;
};

/**
 * Returns a reference to the public interface of the DiagnosticDataProvider singleton object.
 *
 * Applications should use this to access features of the DiagnosticDataProvider object
 * that are common to all platforms.
 */
DiagnosticDataProvider & GetDiagnosticDataProvider();

/**
 * Returns the platform-specific implementation of the DiagnosticDataProvider singleton object.
 *
 * Applications can use this to gain access to features of the DiagnosticDataProvider
 * that are specific to the selected platform.
 */
extern DiagnosticDataProvider & GetDiagnosticDataProviderImpl();

/**
 * Sets a reference to a DiagnosticDataProvider object.
 *
 * This must be called before any calls to GetDiagnosticDataProvider. If a nullptr is passed in,
 * no changes will be made.
 */
void SetDiagnosticDataProvider(DiagnosticDataProvider * diagnosticDataProvider);

inline CHIP_ERROR DiagnosticDataProvider::GetCurrentHeapFree(uint64_t & currentHeapFree)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetCurrentHeapUsed(uint64_t & currentHeapUsed)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetCurrentHeapHighWatermark(uint64_t & currentHeapHighWatermark)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::ResetWatermarks()
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetThreadMetrics(ThreadMetrics ** threadMetricsOut)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline void DiagnosticDataProvider::ReleaseThreadMetrics(ThreadMetrics * threadMetrics) {}

inline CHIP_ERROR DiagnosticDataProvider::GetRebootCount(uint16_t & rebootCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetUpTime(uint64_t & upTime)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetTotalOperationalHours(uint32_t & totalOperationalHours)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetBootReason(BootReasonType & bootReason)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetActiveHardwareFaults(GeneralFaults<kMaxHardwareFaults> & hardwareFaults)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetActiveRadioFaults(GeneralFaults<kMaxRadioFaults> & radioFaults)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetActiveNetworkFaults(GeneralFaults<kMaxNetworkFaults> & networkFaults)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetAverageWearCount(uint32_t & averageWearCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetNetworkInterfaces(NetworkInterface ** netifpp)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline void DiagnosticDataProvider::ReleaseNetworkInterfaces(NetworkInterface * netifp) {}

inline CHIP_ERROR DiagnosticDataProvider::GetEthPHYRate(app::Clusters::EthernetNetworkDiagnostics::PHYRateEnum & pHYRate)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetEthFullDuplex(bool & fullDuplex)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetEthCarrierDetect(bool & carrierDetect)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetEthTimeSinceReset(uint64_t & timeSinceReset)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetEthPacketRxCount(uint64_t & packetRxCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetEthPacketTxCount(uint64_t & packetTxCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetEthTxErrCount(uint64_t & txErrCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetEthCollisionCount(uint64_t & collisionCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetEthOverrunCount(uint64_t & overrunCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::ResetEthNetworkDiagnosticsCounts()
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiBssId(MutableByteSpan & value)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR
DiagnosticDataProvider::GetWiFiSecurityType(app::Clusters::WiFiNetworkDiagnostics::SecurityTypeEnum & securityType)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiVersion(app::Clusters::WiFiNetworkDiagnostics::WiFiVersionEnum & wiFiVersion)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiChannelNumber(uint16_t & channelNumber)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiRssi(int8_t & rssi)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiBeaconLostCount(uint32_t & beaconLostCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiBeaconRxCount(uint32_t & beaconRxCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiPacketMulticastRxCount(uint32_t & packetMulticastRxCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiPacketMulticastTxCount(uint32_t & packetMulticastTxCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiPacketUnicastRxCount(uint32_t & packetUnicastRxCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiPacketUnicastTxCount(uint32_t & packetUnicastTxCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiCurrentMaxRate(uint64_t & currentMaxRate)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::GetWiFiOverrunCount(uint64_t & overrunCount)
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

inline CHIP_ERROR DiagnosticDataProvider::ResetWiFiNetworkDiagnosticsCounts()
{
    return CHIP_ERROR_UNSUPPORTED_CHIP_FEATURE;
}

} // namespace DeviceLayer
} // namespace chip