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

#define NAMELEN  255
#define STATIONS 5

struct station {
 int id;
 char  name[NAMELEN];
 struct edge * edge;
};

struct station* stations;//Ãëîáàëüíûé êîíòåéíåð äëÿ ñòàíöèé

struct edge {
 struct station * to;
 int weight;
 struct edge * next;
};




struct station * getStationById(int id)//TODO: refactor
{
 int i;
 for(i = 0; i < STATIONS; i++){
  if(&stations[i] != NULL){
   if(stations[i].id == id)
    return &stations[i];
  }
 }
 return NULL;
}


void createEdge(struct station * source, int to, int weight) {
 struct edge *newEdge, *lastEdge;
 struct station *destStation;

 newEdge = (struct edge*)malloc(sizeof(struct edge));
 if(!newEdge) {
  perror("Memory allocation failude while edge creation");
  exit(1);
 }
 destStation = getStationById(to);
 if(!destStation){
  perror("Failed to find station while creation");
  exit(1);
 }

 newEdge->weight = weight;
 newEdge->to = destStation;
 newEdge->next = NULL;

 if(source->edge == NULL){//Ó ñòàíöèè åù¸  íåò ñâÿçåé
  source->edge = newEdge;
 } else {//Ó ñòàíöèè óæå åñòü ñâÿçè
  lastEdge = source->edge;
  while (lastEdge->next){
   lastEdge = lastEdge->next;
  }
  lastEdge->next = newEdge;
 }

}

void readEdges()
{
 struct {
  int from;
  int to;
  int weight;
 } edgeData;
 char filename = "edges.dat";

 //Ñ÷èòûâàíèå äàííûõ è ñîçäàíèå ãðàíåé â ïàìÿòè


}




int main(int argc, char * argv[])
{
    FILE *stream;
 int n;
 stations = (struct station*)calloc(STATIONS,sizeof(struct station));//Âûäåëåíèå ïàìÿòè ïîä ìàññèâ ñòàíöèé
 memset(stations,0,sizeof(struct station)*STATIONS);

 if(!stations){
  perror("Memory allocation failure.");
  exit(1);
 }

 stream = fopen("stations.dat", "wb");
 if(stream == NULL){
  perror("Failed to open stations file\n");
  exit(1);
 }

 stations[1].id = 10;
 stations[2].id = 11;

 createEdge(&stations[1],11,5);


 n = fwrite(stations,sizeof(struct station), STATIONS, stream);

 printf("Hello, world %d\n",n);

 fclose(stream);

 stations[1].id = 0;

 stream = fopen("stations.dat","rb");
 if(stream == NULL){
  perror("Failed to open stations file\n");
  exit(1);
 }

 n = fread(stations,sizeof(struct station),10,stream);

 printf("Hello, world %d; value is =%d \n",n,stations[1].id);



 getchar();
 return 0;
}