#include "a_station.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

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){
    unsigned int hash = 0;
    for (int  i = 0; i < strlen(target); i++)
    { hash += target[i] + (hash<<6) + (hash<<16) - hash;
        
    }
    hash = hash %station->track_count;
    

    return hash;
}

void add_target_capacity(struct station* station,const char* target, int capacity){
       int res = select_track(station, target);
    struct car* previous = NULL;
    struct car** ptr = &station->tracks[res];
    struct car* head = *ptr;

   while(head){
    if(strcmp(head->value, target) == 0){
        head->capacity += capacity;
        return;
    }
    previous = head;

    head = head->next;
    

   }
   struct car* next = (struct car*)calloc(1, sizeof(struct car));
   strcpy(next->value, target);
   next->capacity = capacity;
   if(previous){
    previous->next = next;
   }
   else{
    *ptr = next;
   }
}
   


int get_target_capacity(struct station* station,const char* target){
    struct car* ptr = *station->tracks;
    while (ptr)
    { if(strcmp(ptr->value, target) == 0){
        return ptr->capacity;

    }
    ptr = ptr->next;

    
    }
    return 0;
}

int count_targets(struct station* station){
    int count = 0;
    if(*station->tracks == NULL || station == NULL){
        return 0;
    }
    struct car* ptr = *station->tracks;
    while (ptr)
    {
        count++;
       ptr = ptr->next;
    }
    return count;
    
}

int count_capacity(struct station* station){
    int res  = 0;
    struct car* ptr = *station->tracks;
    while (ptr){
        res += ptr->capacity;
        ptr = ptr->next;

    }
    return res;
}