/*
 * FreeRTOS Kernel V10.3.0
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * http://www.FreeRTOS.org
 * http://aws.amazon.com/freertos
 *
 * 1 tab == 4 spaces!
 */

 /***
  * See https://www.FreeRTOS.org/shadow/index.html for configuration and usage instructions.
  ***/

/* Standard includes. */
#include <stdio.h>
#include <time.h>

/* Visual studio intrinsics used so the __debugbreak() function is available
should an assert get hit. */
#include <intrin.h>

/* FreeRTOS includes. */
#include <FreeRTOS.h>
#include "task.h"

/* TCP/IP stack includes. */
#include "FreeRTOS_IP.h"
#include "FreeRTOS_Sockets.h"

/* Demo app includes. */
#include "demo_logging.h"

/*
 * Prototypes for the demos that can be started from this project.  Note the
 * Shadow demo is not actually started until the network is already, which is
 * indicated by vApplicationIPNetworkEventHook() executing - hence
 * vStartShadowDeviceOperationsDemo() is called from inside
 * vApplicationIPNetworkEventHook().
 */
extern void vStartShadowDeviceOperationsDemo( void );

/*
 * Just seeds the simple pseudo random number generator.
 *
 * !!! NOTE !!!
 * This is not a secure method of generating random numbers and production
 * devices should use a true random number generator (TRNG).
 */
static void prvSRand( UBaseType_t ulSeed );

/*
 * Miscellaneous initialization including preparing the logging and seeding the
 * random number generator.
 */
static void prvMiscInitialisation( void );

/* The default IP and MAC address used by the demo.  The address configuration
defined here will be used if ipconfigUSE_DHCP is 0, or if ipconfigUSE_DHCP is
1 but a DHCP server could not be contacted.  See the online documentation for
more information. */
static const uint8_t ucIPAddress[ 4 ] = { configIP_ADDR0, configIP_ADDR1, configIP_ADDR2, configIP_ADDR3 };
static const uint8_t ucNetMask[ 4 ] = { configNET_MASK0, configNET_MASK1, configNET_MASK2, configNET_MASK3 };
static const uint8_t ucGatewayAddress[ 4 ] = { configGATEWAY_ADDR0, configGATEWAY_ADDR1, configGATEWAY_ADDR2, configGATEWAY_ADDR3 };
static const uint8_t ucDNSServerAddress[ 4 ] = { configDNS_SERVER_ADDR0, configDNS_SERVER_ADDR1, configDNS_SERVER_ADDR2, configDNS_SERVER_ADDR3 };

/* Set the following constant to pdTRUE to log using the method indicated by the
name of the constant, or pdFALSE to not log using the method indicated by the
name of the constant.  Options include to standard out (xLogToStdout), to a disk
file (xLogToFile), and to a UDP port (xLogToUDP).  If xLogToUDP is set to pdTRUE
then UDP messages are sent to the IP address configured as the echo server
address (see the configECHO_SERVER_ADDR0 definitions in FreeRTOSConfig.h) and
the port number set by configPRINT_PORT in FreeRTOSConfig.h. */
const BaseType_t xLogToStdout = pdTRUE, xLogToFile = pdFALSE, xLogToUDP = pdFALSE;

/* Default MAC address configuration.  The demo creates a virtual network
connection that uses this MAC address by accessing the raw Ethernet data
to and from a real network connection on the host PC.  See the
configNETWORK_INTERFACE_TO_USE definition for information on how to configure
the real network connection to use. */
const uint8_t ucMACAddress[ 6 ] = { configMAC_ADDR0, configMAC_ADDR1, configMAC_ADDR2, configMAC_ADDR3, configMAC_ADDR4, configMAC_ADDR5 };

/* Use by the pseudo random number generator. */
static UBaseType_t ulNextRand;
/*-----------------------------------------------------------*/

int main( void )
{
	/***
	 * See https://www.FreeRTOS.org/shadow/index.html for configuration and usage instructions.
	 ***/

	/* Miscellaneous initialization including preparing the logging and seeding
	the random number generator. */
	prvMiscInitialisation();

	/* Initialize the network interface.

	***NOTE*** Tasks that use the network are created in the network event hook
	when the network is connected and ready for use (see the implementation of
	vApplicationIPNetworkEventHook() below).  The address values passed in here
	are used if ipconfigUSE_DHCP is set to 0, or if ipconfigUSE_DHCP is set to 1
	but a DHCP server cannot be contacted. */
	FreeRTOS_IPInit( ucIPAddress, ucNetMask, ucGatewayAddress, ucDNSServerAddress, ucMACAddress );

	/* Start the RTOS scheduler. */
	vTaskStartScheduler();

	/* If all is well, the scheduler will now be running, and the following
	line will never be reached.  If the following line does execute, then
	there was insufficient FreeRTOS heap memory available for the idle and/or
	timer tasks to be created.  See the memory management section on the
	FreeRTOS web site for more details (this is standard text that is not
	really applicable to the Win32 simulator port). */
	for( ;; )
	{
		__debugbreak();
	}
}
/*-----------------------------------------------------------*/

/* Called by FreeRTOS+TCP when the network connects or disconnects.  Disconnect
events are only received if implemented in the MAC driver. */
void vApplicationIPNetworkEventHook( eIPCallbackEvent_t eNetworkEvent )
{
uint32_t ulIPAddress, ulNetMask, ulGatewayAddress, ulDNSServerAddress;
char cBuffer[ 16 ];
static BaseType_t xTasksAlreadyCreated = pdFALSE;

	/* If the network has just come up...*/
	if( eNetworkEvent == eNetworkUp )
	{
		/* Create the tasks that use the IP stack if they have not already been
		created. */
		if( xTasksAlreadyCreated == pdFALSE )
		{
			/* Demos that use the network are created after the network is
			up. */
			configPRINTF( ( "---------STARTING DEMO---------\r\n" ) );
			vStartShadowDeviceOperationsDemo();
			xTasksAlreadyCreated = pdTRUE;
		}

		/* Print out the network configuration, which may have come from a DHCP
		server. */
		FreeRTOS_GetAddressConfiguration( &ulIPAddress, &ulNetMask, &ulGatewayAddress, &ulDNSServerAddress );
		FreeRTOS_inet_ntoa( ulIPAddress, cBuffer );
		FreeRTOS_printf( ( "\r\n\r\nIP Address: %s\r\n", cBuffer ) );/*_RB_ Should use IoT libraries logging. */

		FreeRTOS_inet_ntoa( ulNetMask, cBuffer );
		FreeRTOS_printf( ( "Subnet Mask: %s\r\n", cBuffer ) );

		FreeRTOS_inet_ntoa( ulGatewayAddress, cBuffer );
		FreeRTOS_printf( ( "Gateway Address: %s\r\n", cBuffer ) );

		FreeRTOS_inet_ntoa( ulDNSServerAddress, cBuffer );
		FreeRTOS_printf( ( "DNS Server Address: %s\r\n\r\n\r\n", cBuffer ) );
	}
}
/*-----------------------------------------------------------*/

void vAssertCalled( const char *pcFile, uint32_t ulLine )
{
	volatile uint32_t ulBlockVariable = 0UL;
	volatile char *pcFileName = ( volatile char *  ) pcFile;
	volatile uint32_t ulLineNumber = ulLine;

	( void ) pcFileName;
	( void ) ulLineNumber;

	printf( "vAssertCalled( %s, %u\n", pcFile, ulLine );

	/* Setting ulBlockVariable to a non-zero value in the debugger will allow
	this function to be exited. */
	taskDISABLE_INTERRUPTS();
	{
		while( ulBlockVariable == 0UL )
		{
			__debugbreak();
		}
	}
	taskENABLE_INTERRUPTS();
}
/*-----------------------------------------------------------*/

UBaseType_t uxRand( void )
{
const uint32_t ulMultiplier = 0x015a4e35UL, ulIncrement = 1UL;

	/*
	 * Utility function to generate a pseudo random number.
	 *
	 * !!!NOTE!!!
	 * This is not a secure method of generating a random number.  Production
	 * devices should use a True Random Number Generator (TRNG).
	 */
	ulNextRand = ( ulMultiplier * ulNextRand ) + ulIncrement;
	return( ( int ) ( ulNextRand >> 16UL ) & 0x7fffUL );
}
/*-----------------------------------------------------------*/

static void prvSRand( UBaseType_t ulSeed )
{
	/* Utility function to seed the pseudo random number generator. */
	ulNextRand = ulSeed;
}
/*-----------------------------------------------------------*/

static void prvMiscInitialisation( void )
{
time_t xTimeNow;
uint32_t ulLoggingIPAddress;

	ulLoggingIPAddress = FreeRTOS_inet_addr_quick( configECHO_SERVER_ADDR0, configECHO_SERVER_ADDR1, configECHO_SERVER_ADDR2, configECHO_SERVER_ADDR3 );
	vLoggingInit( xLogToStdout, xLogToFile, xLogToUDP, ulLoggingIPAddress, configPRINT_PORT );

	/*
	* Seed random number generator.
	*
	* !!!NOTE!!!
	* This is not a secure method of generating a random number.  Production
	* devices should use a True Random Number Generator (TRNG).
	*/
	time( &xTimeNow );
	FreeRTOS_debug_printf( ( "Seed for randomizer: %lu\n", xTimeNow ) );
	prvSRand( ( uint32_t ) xTimeNow );
	FreeRTOS_debug_printf( ( "Random numbers: %08X %08X %08X %08X\n", ipconfigRAND32(), ipconfigRAND32(), ipconfigRAND32(), ipconfigRAND32() ) );
}
/*-----------------------------------------------------------*/

#if( ipconfigUSE_LLMNR != 0 ) || ( ipconfigUSE_NBNS != 0 ) || ( ipconfigDHCP_REGISTER_HOSTNAME == 1 )

	const char *pcApplicationHostnameHook( void )
	{
		/* Assign the name "FreeRTOS" to this network node.  This function will
		be called during the DHCP: the machine will be registered with an IP
		address plus this name. */
		return mainHOST_NAME;
	}

#endif
/*-----------------------------------------------------------*/

#if( ipconfigUSE_LLMNR != 0 ) || ( ipconfigUSE_NBNS != 0 )

	BaseType_t xApplicationDNSQueryHook( const char *pcName )
	{
	BaseType_t xReturn;

		/* Determine if a name lookup is for this node.  Two names are given
		to this node: that returned by pcApplicationHostnameHook() and that set
		by mainDEVICE_NICK_NAME. */
		if( _stricmp( pcName, pcApplicationHostnameHook() ) == 0 )
		{
			xReturn = pdPASS;
		}
		else if( _stricmp( pcName, mainDEVICE_NICK_NAME ) == 0 )
		{
			xReturn = pdPASS;
		}
		else
		{
			xReturn = pdFAIL;
		}

		return xReturn;
	}

#endif
/*-----------------------------------------------------------*/

/*
 * Callback that provides the inputs necessary to generate a randomized TCP
 * Initial Sequence Number per RFC 6528.  THIS IS ONLY A DUMMY IMPLEMENTATION
 * THAT RETURNS A PSEUDO RANDOM NUMBER SO IS NOT INTENDED FOR USE IN PRODUCTION
 * SYSTEMS.
 */
extern uint32_t ulApplicationGetNextSequenceNumber( uint32_t ulSourceAddress,
													uint16_t usSourcePort,
													uint32_t ulDestinationAddress,
													uint16_t usDestinationPort )
{
	( void ) ulSourceAddress;
	( void ) usSourcePort;
	( void ) ulDestinationAddress;
	( void ) usDestinationPort;

	return uxRand();
}
/*-----------------------------------------------------------*/

/*
 * Supply a random number to FreeRTOS+TCP stack.
 * THIS IS ONLY A DUMMY IMPLEMENTATION THAT RETURNS A PSEUDO RANDOM NUMBER
 * SO IS NOT INTENDED FOR USE IN PRODUCTION SYSTEMS.
 */
BaseType_t xApplicationGetRandomNumber(uint32_t* pulNumber)
{
	*(pulNumber) = uxRand();
	return pdTRUE;
}
/*-----------------------------------------------------------*/

/* configUSE_STATIC_ALLOCATION is set to 1, so the application must provide an
implementation of vApplicationGetIdleTaskMemory() to provide the memory that is
used by the Idle task. */
void vApplicationGetIdleTaskMemory( StaticTask_t** ppxIdleTaskTCBBuffer, StackType_t** ppxIdleTaskStackBuffer, uint32_t* pulIdleTaskStackSize )
{
	/* If the buffers to be provided to the Idle task are declared inside this
	function then they must be declared static - otherwise they will be allocated on
	the stack and so not exists after this function exits. */
	static StaticTask_t xIdleTaskTCB;
	static StackType_t uxIdleTaskStack[configMINIMAL_STACK_SIZE];

	/* Pass out a pointer to the StaticTask_t structure in which the Idle task's
	state will be stored. */
	*ppxIdleTaskTCBBuffer = &xIdleTaskTCB;

	/* Pass out the array that will be used as the Idle task's stack. */
	*ppxIdleTaskStackBuffer = uxIdleTaskStack;

	/* Pass out the size of the array pointed to by *ppxIdleTaskStackBuffer.
	Note that, as the array is necessarily of type StackType_t,
	configMINIMAL_STACK_SIZE is specified in words, not bytes. */
	*pulIdleTaskStackSize = configMINIMAL_STACK_SIZE;
}
/*-----------------------------------------------------------*/

/* configUSE_STATIC_ALLOCATION and configUSE_TIMERS are both set to 1, so the
application must provide an implementation of vApplicationGetTimerTaskMemory()
to provide the memory that is used by the Timer service task. */
void vApplicationGetTimerTaskMemory( StaticTask_t** ppxTimerTaskTCBBuffer, StackType_t** ppxTimerTaskStackBuffer, uint32_t* pulTimerTaskStackSize )
{
	/* If the buffers to be provided to the Timer task are declared inside this
	function then they must be declared static - otherwise they will be allocated on
	the stack and so not exists after this function exits. */
	static StaticTask_t xTimerTaskTCB;
	static StackType_t uxTimerTaskStack[configTIMER_TASK_STACK_DEPTH];

	/* Pass out a pointer to the StaticTask_t structure in which the Timer
	task's state will be stored. */
	*ppxTimerTaskTCBBuffer = &xTimerTaskTCB;

	/* Pass out the array that will be used as the Timer task's stack. */
	*ppxTimerTaskStackBuffer = uxTimerTaskStack;

	/* Pass out the size of the array pointed to by *ppxTimerTaskStackBuffer.
	Note that, as the array is necessarily of type StackType_t,
	configMINIMAL_STACK_SIZE is specified in words, not bytes. */
	*pulTimerTaskStackSize = configTIMER_TASK_STACK_DEPTH;
}
/*-----------------------------------------------------------*/