#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <sys/select.h>
#include <sys/time.h>
#include <stdarg.h>
#include <sys/socket.h>
#ifdef __WIN32__
  #include <ws2tcpip.h>
#endif
#include <microhttpd.h>
#include <curl/curl.h>

#define HTTP_PORT 8000
#define HTTP_URL "http://127.0.0.1:8000/"

#if MHD_VERSION < 0x00040000
int content_read_callback (void* cls, size_t pos, char* buf, int max)
#else
int content_read_callback (void* cls, uint64_t pos, char* buf, int max)
#endif
{
  const char* body = (char*)cls;
  size_t bodylen = strlen(body);
  if (pos >= bodylen)
    return -1;
  size_t len = ((size_t)max <= bodylen - pos ? max : bodylen - pos);
  memcpy(buf, body, len);
  return len;
}

void content_free_callback (void *cls)
{
}

int on_request_data (void *cls, struct MHD_Connection *connection, const char *url, const char *method, const char *version, const char *upload_data, unsigned int *upload_data_size, void **con_cls)
{
	//on first call create data structure
	struct MHD_Response* response = NULL;
	unsigned int status_code = MHD_HTTP_OK;
  //create response
  const char* body = "Hello world!\n";
	response = MHD_create_response_from_callback(MHD_SIZE_UNKNOWN, 2048, content_read_callback, (void*)body, content_free_callback);
	if (!response) {
		status_code = MHD_HTTP_NOT_FOUND;
		response = MHD_create_response_from_data(9, (void*)"Not found", MHD_NO, MHD_NO);
		MHD_add_response_header(response, MHD_HTTP_HEADER_CONTENT_TYPE, "text/html");
	}
	//add header
  MHD_add_response_header(response, MHD_HTTP_HEADER_CONTENT_TYPE, "text/plain");
	//send response
	int ret = MHD_queue_response(connection, status_code, response);
	MHD_destroy_response(response);
	return ret;
}

void on_request_completed (void* cls, struct MHD_Connection* connection, void** con_cls, enum MHD_RequestTerminationCode toe)
{
}

int main (int argc, char *const *argv)
{
  //start HTTP server
  struct MHD_Daemon* webserver;
  if ((webserver = MHD_start_daemon(MHD_USE_THREAD_PER_CONNECTION | MHD_USE_DEBUG | MHD_USE_PEDANTIC_CHECKS, HTTP_PORT, NULL, NULL, &on_request_data, NULL, MHD_OPTION_NOTIFY_COMPLETED, on_request_completed, NULL, MHD_OPTION_END)) == NULL) {
		fprintf(stderr, "Error starting webserver on port %i\n", (int)HTTP_PORT);
    return 1;
  }
  //HTTP client
  CURL *curl;
  CURLcode res;
  if ((curl = curl_easy_init()) != NULL) {
    curl_easy_setopt(curl, CURLOPT_URL, HTTP_URL);
    //curl_easy_setopt(curl, CURLOPT_HTTPHEADER, 1L);
    curl_easy_setopt(curl, CURLOPT_WRITEHEADER, stdout);
    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L);
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
  //stop HTTP server
  MHD_stop_daemon(webserver);
  return 0;
}