struct station* create_station(){
   struct station* station = (struct station*)calloc(1,sizeof(struct station));
   station->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
   station->track_count = STATION_SIZE;
   return station;
}

void destroy_station(struct station* station){
    free(station->tracks);
    free(station);
}

int select_track(struct station* station, const char* target)
{
    int i=0;
    char t=0;
    while(target[i]!=0)
    {
      t+=target[i]; // або інша хеш функція 
    }
    if(t<0) {t=-t;}
    
    i=t%10; //інд в хеш таб
    
    // if(station->tracks[i]==NULL)
    // {
    //     ++
    // }
    // else
    // {
    //     оновимо
    // }
    //return ???;    
    return i;//target[0]%10;
}

void add_target_capacity(struct station* station,const char* target, int capacity)
{
    int i=select_track(station, target);

    struct car *nwcar = (struct car*)calloc(STATION_SIZE, sizeof(struct car));
    nwcar->next=NULL;
    strcpy(nwcar->value, target);
    nwcar->capacity=capacity;

    if(station->tracks[i]==NULL)
    {        
        station->tracks[i]=nwcar;
    }

    struct car* start = station->tracks[i];
    struct car* this = start;    
    while(this->next != NULL)
    {        
        this=this->next;
    }
    this->next=nwcar;
}

int get_target_capacity(struct station* station,const char* target)
{
     int i=select_track(station, target);
    struct car* start = station->tracks[i];
    struct car* this = start;    
    while(this != NULL)
    {
        if(strcmp(this->value , target)==0)
        {
            return this->capacity;
        }
        this=this->next;
    }           
    return 0;
}

int count_targets(struct station* station)
{
    int k=0;
    for (int i = 0 ; i< station->track_count; i++)
    {
        struct car* start = station->tracks[i];
        struct car* this = start;    
        while(this != NULL)
        {
            k++;
            this=this->next;
        }       
    }
    return k;
}

int count_capacity(struct station* station){
    int k=0;

    for (int i = 0 ; i< station->track_count; i++)
    {
        struct car* start = station->tracks[i];
        struct car* this = start;
    
        while(this != NULL)
        {
            k+=this->capacity;
            this=this->next;
        }       
    }
    return k;
}