#include <string.h>
#include <stdio.h>
#include "pico/stdlib.h"

int main() {
  stdio_init_all();

  char http_message[] = {
    "PUT /api/v1.0/pc?code=status HTTP/1.1\r\n"
    "Host: api.int\r\n"
    "User-Agent: curl/7.68.0\r\n"
    "Accept: */*\r\n"
    "\r\n"
  };

  char *message_body = http_message;
  char *delim = " ?=&\r";
  char next_delim;
  char current_delim = '\0';
  char *token;

  while(1) {
    if (*message_body == '\0') { break; }
    token = message_body;
    message_body = strpbrk(message_body, delim);
    if (message_body == NULL) { break; }
    next_delim = *message_body;
    *message_body = '\0';

    switch(current_delim) {
      case '\0':
        printf("Method\t\t%s\n", token);
        break;
      case ' ':
        if (next_delim != '\r') {
          printf("Target\t\t%s\n", token);
        } else {
          printf("Version\t\t%s\n", token);
        }
        break;
      case '?':
      case '&':
        printf("Key\t\t%s\n", token);
        break;
      case '=':
        printf("Value\t\t%s\n", token);
        break; 
    }
    current_delim = next_delim;
    message_body++; 
    // Carriage return indicates we have reached the end of the first line of message body
    if (current_delim == '\r') { break; }
  }                   
  
  return 0;
}