/*
 *
 *    Copyright (c) 2020 Project CHIP Authors
 *    Copyright (c) 2018 Nest Labs, Inc.
 *    All rights reserved.
 *
 *    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
 *          Provides the implementation of the Device Layer ConfigurationManager object
 *          for Linux platforms.
 */

#include <app-common/zap-generated/cluster-objects.h>
#include <ifaddrs.h>
#include <lib/core/CHIPVendorIdentifiers.hpp>
#include <lib/support/CodeUtils.h>
#include <lib/support/logging/CHIPLogging.h>
#include <netpacket/packet.h>
#include <platform/CHIPDeviceConfig.h>
#include <platform/ConfigurationManager.h>
#include <platform/DiagnosticDataProvider.h>
#include <platform/Linux/PosixConfig.h>
#include <platform/internal/GenericConfigurationManagerImpl.ipp>

#include <algorithm>

namespace chip {
namespace DeviceLayer {

using namespace ::chip::DeviceLayer::Internal;

ConfigurationManagerImpl & ConfigurationManagerImpl::GetDefaultInstance()
{
    static ConfigurationManagerImpl sInstance;
    return sInstance;
}

CHIP_ERROR ConfigurationManagerImpl::Init()
{
    CHIP_ERROR err;
    uint32_t rebootCount;

    // Force initialization of NVS namespaces if they doesn't already exist.
    err = PosixConfig::EnsureNamespace(PosixConfig::kConfigNamespace_ChipFactory);
    SuccessOrExit(err);
    err = PosixConfig::EnsureNamespace(PosixConfig::kConfigNamespace_ChipConfig);
    SuccessOrExit(err);
    err = PosixConfig::EnsureNamespace(PosixConfig::kConfigNamespace_ChipCounters);
    SuccessOrExit(err);

    // Initialize the generic implementation base class.
    err = Internal::GenericConfigurationManagerImpl<PosixConfig>::Init();
    SuccessOrExit(err);

    if (!PosixConfig::ConfigValueExists(PosixConfig::kConfigKey_VendorId))
    {
        err = StoreVendorId(CHIP_DEVICE_CONFIG_DEVICE_VENDOR_ID);
        SuccessOrExit(err);
    }

    if (!PosixConfig::ConfigValueExists(PosixConfig::kConfigKey_ProductId))
    {
        err = StoreProductId(CHIP_DEVICE_CONFIG_DEVICE_PRODUCT_ID);
        SuccessOrExit(err);
    }

    if (PosixConfig::ConfigValueExists(PosixConfig::kCounterKey_RebootCount))
    {
        err = GetRebootCount(rebootCount);
        SuccessOrExit(err);

        err = StoreRebootCount(rebootCount + 1);
        SuccessOrExit(err);
    }
    else
    {
        // The first boot after factory reset of the Node.
        err = StoreRebootCount(1);
        SuccessOrExit(err);
    }

    if (!PosixConfig::ConfigValueExists(PosixConfig::kCounterKey_TotalOperationalHours))
    {
        err = StoreTotalOperationalHours(0);
        SuccessOrExit(err);
    }

    if (!PosixConfig::ConfigValueExists(PosixConfig::kCounterKey_BootReason))
    {
        err = StoreBootReason(to_underlying(BootReasonType::kUnspecified));
        SuccessOrExit(err);
    }

    if (!PosixConfig::ConfigValueExists(PosixConfig::kConfigKey_RegulatoryLocation))
    {
        uint32_t location = to_underlying(chip::app::Clusters::GeneralCommissioning::RegulatoryLocationType::kIndoor);
        err               = WriteConfigValue(PosixConfig::kConfigKey_RegulatoryLocation, location);
        SuccessOrExit(err);
    }

    if (!PosixConfig::ConfigValueExists(PosixConfig::kConfigKey_LocationCapability))
    {
        uint32_t location = to_underlying(chip::app::Clusters::GeneralCommissioning::RegulatoryLocationType::kIndoorOutdoor);
        err               = WriteConfigValue(PosixConfig::kConfigKey_LocationCapability, location);
        SuccessOrExit(err);
    }

    err = CHIP_NO_ERROR;

exit:
    return err;
}

CHIP_ERROR ConfigurationManagerImpl::GetPrimaryWiFiMACAddress(uint8_t * buf)
{
    struct ifaddrs * addresses = nullptr;
    struct sockaddr_ll * mac   = nullptr;
    CHIP_ERROR error           = CHIP_NO_ERROR;

    // TODO: ideally the buffer size should have been passed as a span, however
    //       for now use the size that is validated in GenericConfigurationManagerImpl.ipp
    constexpr size_t kExpectedBufMinSize = ConfigurationManager::kPrimaryMACAddressLength;
    memset(buf, 0, kExpectedBufMinSize);

    // Prioritize address for interface matching the WiFi interface name
    // specified in the config headers. Otherwise, use the address for the
    // first non-loopback interface.
    VerifyOrExit(getifaddrs(&addresses) == 0, error = CHIP_ERROR_INTERNAL);
    for (auto addr = addresses; addr != nullptr; addr = addr->ifa_next)
    {
        if ((addr->ifa_addr) && (addr->ifa_addr->sa_family == AF_PACKET))
        {
            if (strncmp(addr->ifa_name, CHIP_DEVICE_CONFIG_WIFI_STATION_IF_NAME, IFNAMSIZ) == 0)
            {
                mac = (struct sockaddr_ll *) addr->ifa_addr;
                break;
            }

            if (strncmp(addr->ifa_name, "lo", IFNAMSIZ) != 0 && !mac)
            {
                mac = (struct sockaddr_ll *) addr->ifa_addr;
            }
        }
    }

    if (mac)
    {
        memcpy(buf, mac->sll_addr, std::min<size_t>(mac->sll_halen, kExpectedBufMinSize));
    }
    else
    {
        error = CHIP_ERROR_NO_ENDPOINT;
    }

    freeifaddrs(addresses);

exit:
    return error;
}

bool ConfigurationManagerImpl::CanFactoryReset()
{
    // TODO(#742): query the application to determine if factory reset is allowed.
    return true;
}

void ConfigurationManagerImpl::InitiateFactoryReset()
{
    PlatformMgr().ScheduleWork(DoFactoryReset);
}

CHIP_ERROR ConfigurationManagerImpl::ReadPersistedStorageValue(::chip::Platform::PersistedStorage::Key key, uint32_t & value)
{
    PosixConfig::Key configKey{ PosixConfig::kConfigNamespace_ChipCounters, key };

    CHIP_ERROR err = ReadConfigValue(configKey, value);
    if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND)
    {
        err = CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND;
    }
    return err;
}

CHIP_ERROR ConfigurationManagerImpl::WritePersistedStorageValue(::chip::Platform::PersistedStorage::Key key, uint32_t value)
{
    PosixConfig::Key configKey{ PosixConfig::kConfigNamespace_ChipCounters, key };
    return WriteConfigValue(configKey, value);
}

#if CHIP_DEVICE_CONFIG_ENABLE_WIFI_STATION
CHIP_ERROR ConfigurationManagerImpl::GetWiFiStationSecurityType(WiFiAuthSecurityType & secType)
{
    CHIP_ERROR err;
    uint32_t secTypeInt;

    err = ReadConfigValue(PosixConfig::kConfigKey_WiFiStationSecType, secTypeInt);
    if (err == CHIP_NO_ERROR)
    {
        secType = static_cast<WiFiAuthSecurityType>(secTypeInt);
    }
    return err;
}

CHIP_ERROR ConfigurationManagerImpl::UpdateWiFiStationSecurityType(WiFiAuthSecurityType secType)
{
    CHIP_ERROR err;
    WiFiAuthSecurityType curSecType;

    if (secType != kWiFiSecurityType_NotSpecified)
    {
        err = GetWiFiStationSecurityType(curSecType);
        if (err == CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND || (err == CHIP_NO_ERROR && secType != curSecType))
        {
            uint32_t secTypeInt = static_cast<uint32_t>(secType);
            err                 = WriteConfigValue(PosixConfig::kConfigKey_WiFiStationSecType, secTypeInt);
        }
        SuccessOrExit(err);
    }
    else
    {
        err = PosixConfig::ClearConfigValue(PosixConfig::kConfigKey_WiFiStationSecType);
        SuccessOrExit(err);
    }

exit:
    return err;
}
#endif // CHIP_DEVICE_CONFIG_ENABLE_WIFI_STATION

CHIP_ERROR ConfigurationManagerImpl::ReadConfigValue(Key key, bool & val)
{
    return PosixConfig::ReadConfigValue(key, val);
}

CHIP_ERROR ConfigurationManagerImpl::ReadConfigValue(Key key, uint16_t & val)
{
    return PosixConfig::ReadConfigValue(key, val);
}

CHIP_ERROR ConfigurationManagerImpl::ReadConfigValue(Key key, uint32_t & val)
{
    return PosixConfig::ReadConfigValue(key, val);
}

CHIP_ERROR ConfigurationManagerImpl::ReadConfigValue(Key key, uint64_t & val)
{
    return PosixConfig::ReadConfigValue(key, val);
}

CHIP_ERROR ConfigurationManagerImpl::ReadConfigValueStr(Key key, char * buf, size_t bufSize, size_t & outLen)
{
    return PosixConfig::ReadConfigValueStr(key, buf, bufSize, outLen);
}

CHIP_ERROR ConfigurationManagerImpl::ReadConfigValueBin(Key key, uint8_t * buf, size_t bufSize, size_t & outLen)
{
    return PosixConfig::ReadConfigValueBin(key, buf, bufSize, outLen);
}

CHIP_ERROR ConfigurationManagerImpl::WriteConfigValue(Key key, bool val)
{
    return PosixConfig::WriteConfigValue(key, val);
}

CHIP_ERROR ConfigurationManagerImpl::WriteConfigValue(Key key, uint16_t val)
{
    return PosixConfig::WriteConfigValue(key, val);
}

CHIP_ERROR ConfigurationManagerImpl::WriteConfigValue(Key key, uint32_t val)
{
    return PosixConfig::WriteConfigValue(key, val);
}

CHIP_ERROR ConfigurationManagerImpl::WriteConfigValue(Key key, uint64_t val)
{
    return PosixConfig::WriteConfigValue(key, val);
}

CHIP_ERROR ConfigurationManagerImpl::WriteConfigValueStr(Key key, const char * str)
{
    return PosixConfig::WriteConfigValueStr(key, str);
}

CHIP_ERROR ConfigurationManagerImpl::WriteConfigValueStr(Key key, const char * str, size_t strLen)
{
    return PosixConfig::WriteConfigValueStr(key, str, strLen);
}

CHIP_ERROR ConfigurationManagerImpl::WriteConfigValueBin(Key key, const uint8_t * data, size_t dataLen)
{
    return PosixConfig::WriteConfigValueBin(key, data, dataLen);
}

void ConfigurationManagerImpl::RunConfigUnitTest()
{
    PosixConfig::RunConfigUnitTest();
}

void ConfigurationManagerImpl::DoFactoryReset(intptr_t arg)
{
    CHIP_ERROR err;

    ChipLogProgress(DeviceLayer, "Performing factory reset");

    err = PosixConfig::FactoryResetConfig();
    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(DeviceLayer, "Failed to factory reset configurations: %s", ErrorStr(err));
    }

    err = PosixConfig::FactoryResetCounters();
    if (err != CHIP_NO_ERROR)
    {
        ChipLogError(DeviceLayer, "Failed to factory reset counters: %s", ErrorStr(err));
    }

#if CHIP_DEVICE_CONFIG_ENABLE_THREAD

    ChipLogProgress(DeviceLayer, "Clearing Thread provision");
    ThreadStackMgr().ErasePersistentInfo();

#endif // CHIP_DEVICE_CONFIG_ENABLE_THREAD

    // Restart the system.
    ChipLogProgress(DeviceLayer, "System restarting (not implemented)");
    // TODO(#742): restart CHIP exe
}

CHIP_ERROR ConfigurationManagerImpl::StoreVendorId(uint16_t vendorId)
{
    return WriteConfigValue(PosixConfig::kConfigKey_VendorId, vendorId);
}

CHIP_ERROR ConfigurationManagerImpl::StoreProductId(uint16_t productId)
{
    return WriteConfigValue(PosixConfig::kConfigKey_ProductId, productId);
}

CHIP_ERROR ConfigurationManagerImpl::GetRebootCount(uint32_t & rebootCount)
{
    return ReadConfigValue(PosixConfig::kCounterKey_RebootCount, rebootCount);
}

CHIP_ERROR ConfigurationManagerImpl::StoreRebootCount(uint32_t rebootCount)
{
    return WriteConfigValue(PosixConfig::kCounterKey_RebootCount, rebootCount);
}

CHIP_ERROR ConfigurationManagerImpl::GetTotalOperationalHours(uint32_t & totalOperationalHours)
{
    return ReadConfigValue(PosixConfig::kCounterKey_TotalOperationalHours, totalOperationalHours);
}

CHIP_ERROR ConfigurationManagerImpl::StoreTotalOperationalHours(uint32_t totalOperationalHours)
{
    return WriteConfigValue(PosixConfig::kCounterKey_TotalOperationalHours, totalOperationalHours);
}

CHIP_ERROR ConfigurationManagerImpl::GetBootReason(uint32_t & bootReason)
{
    return ReadConfigValue(PosixConfig::kCounterKey_BootReason, bootReason);
}

CHIP_ERROR ConfigurationManagerImpl::StoreBootReason(uint32_t bootReason)
{
    return WriteConfigValue(PosixConfig::kCounterKey_BootReason, bootReason);
}

CHIP_ERROR ConfigurationManagerImpl::GetRegulatoryLocation(uint8_t & location)
{
    uint32_t value;

    if (CHIP_NO_ERROR != ReadConfigValue(PosixConfig::kConfigKey_RegulatoryLocation, value))
    {
        ReturnErrorOnFailure(GetLocationCapability(location));

        if (CHIP_NO_ERROR != StoreRegulatoryLocation(location))
        {
            ChipLogError(DeviceLayer, "Failed to store RegulatoryLocation");
        }
    }
    else
    {
        location = static_cast<uint8_t>(value);
    }

    return CHIP_NO_ERROR;
}

CHIP_ERROR ConfigurationManagerImpl::GetLocationCapability(uint8_t & location)
{
    uint32_t value = 0;

    CHIP_ERROR err = ReadConfigValue(PosixConfig::kConfigKey_LocationCapability, value);

    if (err == CHIP_NO_ERROR)
    {
        VerifyOrReturnError(value <= UINT8_MAX, CHIP_ERROR_INVALID_INTEGER_VALUE);
        location = static_cast<uint8_t>(value);
    }

    return err;
}

ConfigurationManager & ConfigurationMgrImpl()
{
    return ConfigurationManagerImpl::GetDefaultInstance();
}

} // namespace DeviceLayer
} // namespace chip