#include "FreeRTOS.h"
#include "task.h"
#include "polarssl/config.h"

#include <string.h>
#include <stdio.h>

#include "polarssl/net.h"
#include "polarssl/ssl.h"
#include "polarssl/error.h"
#include "polarssl/memory.h"

#define SERVER_PORT   443
#define SERVER_HOST   "192.168.13.15"
#define GET_REQUEST   "GET / HTTP/1.0\r\n\r\n"
#define DEBUG_LEVEL   0

//#define SSL_CLIENT_EXT
#ifdef SSL_CLIENT_EXT
#define STACKSIZE     2048
#else
#define STACKSIZE     1150
#endif

static int is_task = 0;
static char server_host[16];
static size_t min_heap_size = 0;

static void my_debug(void *ctx, int level, const char *str)
{
	if(level <= DEBUG_LEVEL) {
		printf("\n\r%s", str);
	}
}

static int my_random(void *p_rng, unsigned char *output, size_t output_len)
{
	rtw_get_random_bytes(output, output_len);
	return 0;
}

void* my_malloc(size_t size)
{
	void *ptr = pvPortMalloc(size);
	size_t current_heap_size = xPortGetFreeHeapSize();

	if((current_heap_size < min_heap_size) || (min_heap_size == 0))
		min_heap_size = current_heap_size;

	return ptr;
}

#define my_free		vPortFree

static void ssl_client(void *param)
{
	int ret, len, server_fd = -1;
	unsigned char buf[512];
	ssl_context ssl;
	int retry_count = 0;

	memory_set_own(my_malloc, my_free);

	/*
	 * 1. Start the connection
	 */
	printf("\n\r  . Connecting to tcp/%s/%d...", server_host, SERVER_PORT);

	if((ret = net_connect(&server_fd, server_host, SERVER_PORT)) != 0) {
		printf(" failed\n\r  ! net_connect returned %d\n", ret);
		goto exit1;
	}

	printf(" ok\n");

	/*
	 * 2. Setup stuff
	 */
	printf("\n\r  . Setting up the SSL/TLS structure..." );

	if((ret = ssl_init(&ssl)) != 0) {
		printf(" failed\n\r  ! ssl_init returned %d\n", ret);
		goto exit;
	}
#ifdef SSL_CLIENT_EXT
	if((ret = ssl_client_ext_init()) != 0) {
		printf(" failed\n\r  ! ssl_client_ext_init returned %d\n", ret);
		goto exit;
	}
#endif
	ssl_set_endpoint(&ssl, SSL_IS_CLIENT);
	ssl_set_authmode(&ssl, SSL_VERIFY_NONE);
	ssl_set_rng(&ssl, my_random, NULL);
	ssl_set_bio(&ssl, net_recv, &server_fd, net_send, &server_fd);
	ssl_set_dbg(&ssl, my_debug, NULL);
#ifdef POLARSSL_DEBUG_C
	debug_set_threshold(DEBUG_LEVEL);
#endif
#ifdef SSL_CLIENT_EXT
	if((ret = ssl_client_ext_setup(&ssl)) != 0) {
		printf(" failed\n\r  ! ssl_client_ext_setup returned %d\n", ret);
		goto exit;
	}
#endif

	printf(" ok\n");

	/*
	 * 3. Handshake
	 */
	printf("\n\r  . Performing the SSL/TLS handshake...");

	while((ret = ssl_handshake(&ssl)) != 0) {
		if((ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE  
			&& ret != POLARSSL_ERR_NET_RECV_FAILED) || retry_count >= 5) {
			printf(" failed\n\r  ! ssl_handshake returned -0x%x\n", -ret);
			goto exit;
		}
		retry_count++;
	}

	printf(" ok\n");
	printf("\n\r  . Use ciphersuite %s\n", ssl_get_ciphersuite(&ssl));

	/*
	 * 4. Write the GET request
	 */
	printf("\n\r  > Write to server:");

	len = sprintf((char *) buf, GET_REQUEST);

	while((ret = ssl_write(&ssl, buf, len)) <= 0) {
		if(ret != POLARSSL_ERR_NET_WANT_READ && ret != POLARSSL_ERR_NET_WANT_WRITE) {
			printf(" failed\n\r  ! ssl_write returned %d\n", ret);
			goto exit;
		}
	}

	len = ret;
	printf(" %d bytes written\n\r\n\r%s\n", len, (char *) buf);

	/*
	 * 5. Read the HTTP response
	 */
	printf("\n\r  < Read from server:");

	do {
		len = sizeof(buf) - 1;
		memset(buf, 0, sizeof(buf));
		ret = ssl_read(&ssl, buf, len);

		if(ret == POLARSSL_ERR_NET_WANT_READ || ret == POLARSSL_ERR_NET_WANT_WRITE)
			continue;

		if(ret == POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY)
			break;

		if(ret < 0) {
			printf(" failed\n\r  ! ssl_read returned %d\n", ret);
			break;
		}

		if(ret == 0) {
			printf("\n\rEOF\n");
			break;
		}

		len = ret;
		printf(" %d bytes read\n\r\n\r%s\n", len, (char *) buf);
	}
	while(1);

	ssl_close_notify(&ssl);

exit:

#ifdef POLARSSL_ERROR_C
	if(ret != 0) {
		char error_buf[100];
		polarssl_strerror(ret, error_buf, 100);
		printf("\n\rLast error was: %d - %s\n", ret, error_buf);
	}
#endif

	net_close(server_fd);
	ssl_free(&ssl);
#ifdef SSL_CLIENT_EXT
	ssl_client_ext_free();
#endif
exit1:

	if(is_task) {
#if defined(INCLUDE_uxTaskGetStackHighWaterMark) && (INCLUDE_uxTaskGetStackHighWaterMark == 1)
		printf("\n\rMin available stack size of %s = %d * %d bytes\n\r", __FUNCTION__, uxTaskGetStackHighWaterMark(NULL), sizeof(portBASE_TYPE));
#endif

		if(min_heap_size > 0)
			printf("\n\rMin available heap size = %d bytes during %s\n\r", min_heap_size, __FUNCTION__);

		vTaskDelete(NULL);
	}

	if(param != NULL)
		*((int *) param) = ret;
}

void start_ssl_client(void)
{
	is_task = 1;
	//strcpy(server_host, SERVER_HOST);

	if(xTaskCreate(ssl_client, "ssl_client", STACKSIZE, NULL, tskIDLE_PRIORITY + 1, NULL) != pdPASS)
		printf("\n\r%s xTaskCreate failed", __FUNCTION__);
}

void do_ssl_connect(void)
{
	int ret;
	static int success = 0;
	static int fail = 0;

	is_task = 0;
	strcpy(server_host, SERVER_HOST);
	ssl_client(&ret);

	if(ret != 0)
		printf("\n\r%s fail (success %d times, fail %d times)\n\r", __FUNCTION__, success, ++ fail);
	else
		printf("\n\r%s success (success %d times, fail %d times)\n\r", __FUNCTION__, ++ success, fail);
}

void cmd_ssl_client(int argc, char **argv)
{
	if(argc == 2) {
		strcpy(server_host, argv[1]);
	}
	else {
		printf("\n\rUsage: %s SSL_SERVER_HOST", argv[0]);
		return;
	}

	start_ssl_client();
}