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

#define CITYNAMESIZE 30

struct cityRecord
{
   double x, y;
   char city[CITYNAMESIZE];
   struct cityRecord *next;
};

typedef struct cityRecord cityNode;

void getFiles(char filename[]);
FILE* fileOpen(char *filename, char *mode);
void exitIfFault(FILE *fp, char filename[]);
void reorderList();
void printDistance();
void calculateDistance();
void selectFirstNode();
void printList();
cityNode* createNode(double x, double y, char tempCity);
void addIntoLinkList(char tempCity, double x, double y);

int main(int argc, char *argv[])
{
   cityNode *start;
   
   start = NULL;
         
   getFiles(argv[1]);
   /* printList */
   /* selectFirstNode */
   /* calculateDistance */
   /* printDistance */
   /* reorderList */
   /* printList */
   /* calculateDistance */
   /* printDistance */   
   
   return 0;
}

void printList()
{
}

void selectFirstNode()
{
}

void calculateDistance()
{
}

void printDistance()
{
}

void reorderList()
{
}

cityNode* createNode(double x, double y, char tempCity)
{
   cityNode *tempPtr;
   
   tempPtr = (cityNode*) malloc(sizeof(cityNode));
   if(tempPtr == NULL)
   {
      printf("Memory allocation error\n");
      exit(EXIT_FAILURE);      
   }
   tempPtr->x = x;
   tempPtr->y = y;
   tempPtr->city = tempCity;
   tempPtr->next = NULL;
   
   return tempPtr;
}

void addIntoLinkList(char tempCity, double x, double y)
{
   cityNode *temp, *prev, *loc;
   temp = createNode(tempCity,x,y);
   if(*start ==NULL)
   {
      /* add first item to the list */
      *start = temp;
   }
   
   
}
void getFiles(char filename[])
{
   FILE *fp;      /* defines a file pointer */
   int status;
   double x, y;    
   char tempCity[CITYNAMESIZE];     
   /* open stream to file */
   fp=fileOpen(filename, "r");   
   while(!feof(fp))
   {
      /* lf -long float = double*/
      status = fscanf(fp, "%s%lf%lf", tempCity, &x, &y);       
 
      if(status == -1)
      { 
         /* do nothing */
      } 
      else if(status == 3)      /* if there are 3 arg in the line in the file */
      {
         addIntoLinkList(tempCity,x,y);
         /* addnode */
         /* no printing here */
         printf("%-12s %-8.2f %-8.2f\n", tempCity, x, y);      
      }
      else
      {
         printf("\n");
         printf("ERROR - Corrupted record in file\n");
         exit(0); 
      }
   }    
}
FILE* fileOpen(char *filename, char *mode)
{
   FILE *fp = fopen(filename, mode);   
   if(fp == NULL)
   {
      printf("ERROR - Unable to access %s\n", filename);
      exit(1);
   }
   return fp;
}