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

int main()
{
   system("iwlist ath0 peers > foo.txt"); // get all the peers and their corresponding strength and put them in a file

   FILE *file;
   file = fopen("foo.txt", "r");
   int i, p_index, str_index, index, check;
   char p[50];              // contains parsed string
   int sig_strength[3];     // store the strength of the 3 peers, 
                            // this is what needs to be put in packet and sent to server 

   check = fscanf(file, "%s", &p); 

   while(p != NULL && check != EOF)
   {
      if (strcmp(p, "00:18:39:05:20:26") == 0)     // Robot 192.168.1.4's mac addr
      {
         char str1[3] = {' ',' ',' '};
         char str2[3] = {' ',' ',' '};

         for(index = 0; index < 8; index++)  // get the 8 strings on this line associated with this mac addr
         {
            fscanf(file, "%s",&p);
            if (index == 1)                      // The second string represents Signal Strength data, obtain strength value from it
            {
               str_index = 0;
               p_index = 8;
               str1[str_index++] = p[p_index++];
               
               while(p[p_index] != '/')
               {
                  str1[str_index++] = p[p_index++];
               }

               p_index++;
               str_index = 0;

               while(p_index < strlen(p))
               {
                  str2[str_index++] = p[p_index++];
               }
               
               sig_strength[2] = (int) ((atof(str1)/atof(str2)) * 100);     // Convert signal strength to reflect value out of 100
            }
         }
      }
      else if (strcmp(p, "00:18:39:05:1B:37") == 0)  // Robot 192.168.1.3's mac addr
      {
         char str1[3] = {' ',' ',' '};
         char str2[3] = {' ',' ',' '};

         for(index = 0; index < 8; index++)   // get the 8 strings on this line associated with this mac addr
         {
            fscanf(file, "%s",&p);
            if (index == 1)                       // The second string represents Signal Strength data, obtain strength value from it
            {
               str_index = 0;
               p_index = 8;
               str1[str_index++] = p[p_index++];

               while(p[p_index] != '/')
               {
                  str1[str_index++] = p[p_index++];
               }

               p_index++;
               str_index = 0;

               while(p_index < strlen(p))
               {
                  str2[str_index++] = p[p_index++];
               }

               sig_strength[1] = (int) ((atof(str1)/atof(str2)) * 100);    // Convert signal strength to reflect value out of 100
            }
         }           
      }
      else if (strcmp(p, "00:18:39:05:1E:DE") == 0)   // Robot 192.168.1.2's mac addr
      {
         char str1[3] = {' ',' ',' '};
         char str2[3] = {' ',' ',' '};

         for(index = 0; index < 8; index++)     // get the 8 strings on this line associated with this mac addr
         {
            fscanf(file, "%s",&p);
            if (index == 1)                     // The second string represents Signal Strength data, obtain strength value from it
            {
               str_index = 0;
               p_index = 8;
               str1[str_index++] = p[p_index++];

               while(p[p_index] != '/')
               {
                  str1[str_index++] = p[p_index++];
               }

               p_index++;
               str_index = 0;

               while(p_index < strlen(p))
               {
                  str2[str_index++] = p[p_index++];
               }

               sig_strength[0] = (int) ((atof(str1)/atof(str2)) * 100);  // Convert signal strength to reflect value out of 100 
            }
         }
      }

      check = fscanf(file,"%s\n", &p); 

   }

   // These print statements are just for testing to see if right values were obtained
   // They will not be needed once this code is integrated
   printf("Robot 1 Strength: %d/100\n", sig_strength[0]);
   printf("Robot 2 Strength: %d/100\n", sig_strength[1]);
   printf("Robot 3 Strength: %d/100\n", sig_strength[2]);
   
   return 0;

}