/** @brief Matter initialization data.
 *
 * This structure contains all user specific implementations of Matter interfaces
 * and custom initialization callbacks that must be initialized in the Matter thread.
 */
struct InitData {
      /** @brief Matter stack events handler. */
      chip::DeviceLayer::PlatformManager::EventHandlerFunct mEventHandler{ DefaultEventHandler };
      /** @brief Pointer to the user provided NetworkCommissioning instance. */
#ifdef CONFIG_CHIP_WIFI
      chip::app::Clusters::NetworkCommissioning::Instance *mNetworkingInstance{ &sWiFiCommissioningInstance };
#else
      chip::app::Clusters::NetworkCommissioning::Instance *mNetworkingInstance{ nullptr };
#endif
      /** @brief Pointer to the user provided custom server initialization parameters. */
      chip::CommonCaseDeviceServerInitParams *mServerInitParams{ &sServerInitParamsDefault };
      /** @brief Pointer to the user provided custom device info provider implementation. */
      chip::DeviceLayer::DeviceInfoProviderImpl *mDeviceInfoProvider{ nullptr };
#ifdef CONFIG_CHIP_FACTORY_DATA
      /** @brief Pointer to the user provided FactoryDataProvider implementation. */
      chip::DeviceLayer::FactoryDataProviderBase *mFactoryDataProvider{ &sFactoryDataProviderDefault };
#endif
#ifdef CONFIG_CHIP_CRYPTO_PSA
      /** @brief Pointer to the user provided OperationalKeystore implementation. */
      chip::Crypto::OperationalKeystore *mOperationalKeyStore{ &sOperationalKeystoreDefault };
#endif
      /** @brief Custom code to execute in the Matter main event loop before the server initialization. */
      CustomInit mPreServerInitClbk{ nullptr };
      /** @brief Custom code to execute in the Matter main event loop after the server initialization. */
      CustomInit mPostServerInitClbk{ nullptr };

      /** @brief Default implementation static objects that will be stripped by the compiler when above
       * pointers are overwritten by the application. */
#ifdef CONFIG_CHIP_WIFI
      static chip::app::Clusters::NetworkCommissioning::Instance sWiFiCommissioningInstance;
#endif
      static chip::CommonCaseDeviceServerInitParams sServerInitParamsDefault;
#ifdef CONFIG_CHIP_FACTORY_DATA
      static chip::DeviceLayer::FactoryDataProvider<chip::DeviceLayer::InternalFlashFactoryData> sFactoryDataProviderDefault;
#endif
#ifdef CONFIG_CHIP_CRYPTO_PSA
      static chip::Crypto::PSAOperationalKeystore sOperationalKeystoreDefault;
#endif
};

CHIP_ERROR MatterAppInit()
{
      /* Initialize Matter stack */
      ReturnErrorOnFailure(Nrf::Matter::PrepareServer(Nrf::Matter::InitData{ .mPostServerInitClbk = [] {
             LOG_INF("Matter server has been initialized.");
             /* Change some LED state */
             return CHIP_NO_ERROR;
      } }));

      /* Application specific initialization, for example, hardware initialization.

         ...
      */

      /* Start Matter thread that will run the scheduled initialization procedure. */
      return Nrf::Matter::StartServer();
}

static void CustomMatterEventHandler(const ChipDeviceEvent *event, intptr_t /* unused */)
{
      switch (event->Type) {
      case DeviceEventType::kCommissioningComplete:
          /* Custom code, for example, control LED */
          break;
      }
}

/* Register custom Matter event handler. */
ReturnErrorOnFailure(Nrf::Matter::RegisterEventHandler(CustomMatterEventHandler, 0));