#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <sys/time.h>
#include <unistd.h>


#include <ctype.h>

#include <amqp.h>
#include <amqp_framing.h>

#include "utils.h"


#define SUMMARY_EVERY_US 1000000




uint64_t now_microseconds(void)
{
  struct timeval tv;
  gettimeofday(&tv, NULL);
  return (uint64_t) tv.tv_sec * 1000000 + (uint64_t) tv.tv_usec;
}

void microsleep(int usec)
{
  usleep(usec);
}

void die_on_error(int x, char const *context) {
  if (x < 0) {
    char *errstr = amqp_error_string(-x);
    fprintf(stderr, "%s: %s\n", context, errstr);
    free(errstr);
    exit(1);
  }
}

void die_on_amqp_error(amqp_rpc_reply_t x, char const *context) {
  switch (x.reply_type) {
    case AMQP_RESPONSE_NORMAL:
      return;

    case AMQP_RESPONSE_NONE:
      fprintf(stderr, "%s: missing RPC reply type!\n", context);
      break;

    case AMQP_RESPONSE_LIBRARY_EXCEPTION:
      fprintf(stderr, "%s: %s\n", context, amqp_error_string(x.library_error));
      break;

    case AMQP_RESPONSE_SERVER_EXCEPTION:
      switch (x.reply.id) {
	case AMQP_CONNECTION_CLOSE_METHOD: {
	  amqp_connection_close_t *m = (amqp_connection_close_t *) x.reply.decoded;
	  fprintf(stderr, "%s: server connection error %d, message: %.*s\n",
		  context,
		  m->reply_code,
		  (int) m->reply_text.len, (char *) m->reply_text.bytes);
	  break;
	}
	case AMQP_CHANNEL_CLOSE_METHOD: {
	  amqp_channel_close_t *m = (amqp_channel_close_t *) x.reply.decoded;
	  fprintf(stderr, "%s: server channel error %d, message: %.*s\n",
		  context,
		  m->reply_code,
		  (int) m->reply_text.len, (char *) m->reply_text.bytes);
	  break;
	}
	default:
	  fprintf(stderr, "%s: unknown server error, method id 0x%08X\n", context, x.reply.id);
	  break;
      }
      break;
  }

  exit(1);
}

static void send_batch(amqp_connection_state_t conn, char const *queue_name, int rate_limit, int message_count)
{
  uint64_t start_time = now_microseconds();
  int i;
  int sent = 0;
  int previous_sent = 0;
  uint64_t previous_report_time = start_time;
  uint64_t next_summary_time = start_time + SUMMARY_EVERY_US;

  char message[256];
  amqp_bytes_t message_bytes;

  for (i = 0; i < (int)sizeof(message); i++) {
    message[i] = i & 0xff;
  }

  message_bytes.len = sizeof(message);
  message_bytes.bytes = message;

  for (i = 0; i < message_count; i++) {
    uint64_t now = now_microseconds();

    { 
      amqp_basic_properties_t props;
      props._flags = AMQP_BASIC_CONTENT_TYPE_FLAG | AMQP_BASIC_DELIVERY_MODE_FLAG;
      props.content_type = amqp_cstring_bytes("text/plain");
      props.delivery_mode = 2; /* persistent delivery mode */

      // works ! (queue get populated even if no consumer)
      die_on_error(amqp_basic_publish(conn, 1, amqp_cstring_bytes(""), amqp_cstring_bytes(queue_name), 0, 0, &props, message_bytes), "Publishing");

      // don't works ! (queue get populated only if consumer up)
      //die_on_error(amqp_basic_publish(conn, 1, amqp_cstring_bytes("amq.direct"), amqp_cstring_bytes(queue_name), 0, 0, &props, message_bytes), "Publishing");
    }

	// note that "amq.direct" is a special exchange
	// (The empty exchange name is an alias for amq.direct)
    //die_on_error(amqp_basic_publish(conn, 1, amqp_cstring_bytes("amq.direct"), amqp_cstring_bytes(queue_name), 0, 0, NULL, message_bytes), "Publishing");


    sent++;
    if (now > next_summary_time) {
      int countOverInterval = sent - previous_sent;
      double intervalRate = countOverInterval / ((now - previous_report_time) / 1000000.0);
      printf("%d ms: Sent %d - %d since last report (%d Hz)\n", (int)(now - start_time) / 1000, sent, countOverInterval, (int) intervalRate);

      previous_sent = sent;
      previous_report_time = now;
      next_summary_time += SUMMARY_EVERY_US;
    }

    while (((i * 1000000.0) / (now - start_time)) > rate_limit) {
      microsleep(2000);
      now = now_microseconds();
    }
  }

  {
    uint64_t stop_time = now_microseconds();
    int total_delta = stop_time - start_time;

    printf("PRODUCER - Message count: %d\n", message_count);
    printf("Total time, milliseconds: %d\n", total_delta / 1000);
    printf("Overall messages-per-second: %g\n", (message_count / (total_delta / 1000000.0)));
  }
}

//int main(int argc, char const * const *argv) {
int main_light(int argc, char const * const *argv) {
  char const *hostname;
  int port;
  int rate_limit;
  int message_count;
  int sockfd;
  amqp_connection_state_t conn;

  amqp_bytes_t reply_to_queue;

  if (argc < 5) {
    fprintf(stderr, "Usage: amqp_producer host port rate_limit message_count\n");
    return 1;
  }

  hostname = argv[1];
  port = atoi(argv[2]);
  rate_limit = atoi(argv[3]);
  message_count = atoi(argv[4]);

  conn = amqp_new_connection();

  die_on_error(sockfd = amqp_open_socket(hostname, port), "Opening socket");

  amqp_set_sockfd(conn, sockfd);

  die_on_amqp_error(amqp_login(conn, "/", 0, 131072, 0, AMQP_SASL_METHOD_PLAIN, "guest", "guest"), "Logging in");

  amqp_channel_open(conn, 1);

  die_on_amqp_error(amqp_get_rpc_reply(conn), "Opening channel");

  //JRA
  /*
  {
    amqp_queue_declare_ok_t *r = amqp_queue_declare(conn, 1, amqp_cstring_bytes("test queue"), 0, 1, 0, 0, amqp_empty_table); // durable && no auto-delete
    die_on_amqp_error(amqp_get_rpc_reply(conn), "Declaring queue");
    reply_to_queue = amqp_bytes_malloc_dup(r->queue);
    if (reply_to_queue.bytes == NULL) {
      fprintf(stderr, "Out of memory while copying queue name");
      return 1;
    }
  }
  */

  send_batch(conn, "test queue", rate_limit, message_count); // note that "test queue" here is used as the routing key

  die_on_amqp_error(amqp_channel_close(conn, 1, AMQP_REPLY_SUCCESS), "Closing channel");
  die_on_amqp_error(amqp_connection_close(conn, AMQP_REPLY_SUCCESS), "Closing connection");
  die_on_error(amqp_destroy_connection(conn), "Ending connection");

  return 0;
}


//int main_complex(int argc, char const * const *argv) {
int main(int argc, char const * const *argv) {
  char const *hostname;
  int port;
  char const *exchange;
  char const *routingkey;
  char const *messagebody;


  
  int sockfd;
  amqp_connection_state_t conn;

  if (argc < 4) {
    fprintf(stderr, "Usage: amqp_sendstring host port messagebody\n");
    return 1;
  }

  hostname = argv[1];
  port = atoi(argv[2]);
  //exchange = argv[3];
  //routingkey = argv[4];
  messagebody = argv[5];

  conn = amqp_new_connection();

  die_on_error(sockfd = amqp_open_socket(hostname, port), "Opening socket");
  amqp_set_sockfd(conn, sockfd);
  die_on_amqp_error(amqp_login(conn, "/", 0, 131072, 0, AMQP_SASL_METHOD_PLAIN, "guest", "guest"), "Logging in");
  amqp_channel_open(conn, 1);
  die_on_amqp_error(amqp_get_rpc_reply(conn), "Opening channel");




  //JRA
  amqp_exchange_declare(conn, 1, amqp_cstring_bytes("myexchange"), amqp_cstring_bytes("fanout"), 0, 0, amqp_empty_table);
  die_on_amqp_error(amqp_get_rpc_reply(conn), "Declaring exchange");

  //JRA
  amqp_queue_declare_ok_t *r = amqp_queue_declare(conn, 1, amqp_cstring_bytes("myqueue"), 0, 1, 0, 0, amqp_empty_table); // durable && no auto-delete
  die_on_amqp_error(amqp_get_rpc_reply(conn), "Declaring queue");

  amqp_queue_bind(conn, 1, amqp_cstring_bytes("myqueue"), amqp_cstring_bytes("myexchange"), amqp_cstring_bytes(""), amqp_empty_table); //no need for binding key as we use the fanout exchange type
  die_on_amqp_error(amqp_get_rpc_reply(conn), "Binding");



  { 
    amqp_basic_properties_t props;
    props._flags = AMQP_BASIC_CONTENT_TYPE_FLAG | AMQP_BASIC_DELIVERY_MODE_FLAG;
    props.content_type = amqp_cstring_bytes("text/plain");
    props.delivery_mode = 2; /* persistent delivery mode */
    die_on_error(amqp_basic_publish(conn, 1, amqp_cstring_bytes("myexchange"), amqp_cstring_bytes(""), 0, 0, &props, amqp_cstring_bytes(messagebody)), "Publishing");
  }

  die_on_amqp_error(amqp_channel_close(conn, 1, AMQP_REPLY_SUCCESS), "Closing channel");
  die_on_amqp_error(amqp_connection_close(conn, AMQP_REPLY_SUCCESS), "Closing connection");
  die_on_error(amqp_destroy_connection(conn), "Ending connection");
  return 0;
}

// -- not used -- //

static void dump_row(long count, int numinrow, int *chs) {
  int i;

  printf("%08lX:", count - numinrow);

  if (numinrow > 0) {
    for (i = 0; i < numinrow; i++) {
      if (i == 8)
    printf(" :");
      printf(" %02X", chs[i]);
    }
    for (i = numinrow; i < 16; i++) {
      if (i == 8)
    printf(" :");
      printf("   ");
    }
    printf("  ");
    for (i = 0; i < numinrow; i++) {
      if (isprint(chs[i]))
    printf("%c", chs[i]);
      else
    printf(".");
    }
  }
  printf("\n");
}

static int rows_eq(int *a, int *b) {
  int i;

  for (i=0; i<16; i++)
    if (a[i] != b[i])
      return 0;

  return 1;
}

void amqp_dump(void const *buffer, size_t len) {
  unsigned char *buf = (unsigned char *) buffer;
  long count = 0;
  int numinrow = 0;
  int chs[16];
  int oldchs[16] = {0};
  int showed_dots = 0;
  size_t i;

  for (i = 0; i < len; i++) {
    int ch = buf[i];

    if (numinrow == 16) {
      int i;

      if (rows_eq(oldchs, chs)) {
    if (!showed_dots) {
      showed_dots = 1;
      printf("          .. .. .. .. .. .. .. .. : .. .. .. .. .. .. .. ..\n");
    } 
      } else {
    showed_dots = 0;
    dump_row(count, numinrow, chs);
      }

      for (i=0; i<16; i++)
    oldchs[i] = chs[i];

      numinrow = 0;
    }

    count++;
    chs[numinrow++] = ch;
  }

  dump_row(count, numinrow, chs);

  if (numinrow != 0)
    printf("%08lX:\n", count);
}