#include "a_station.h"
#include <stdlib.h>
#include <string.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){
        for (int i = 0; i < station->track_count; i++) {
                struct car* eto = station->tracks[i];
                while (eto != NULL) {
                        struct car* delete = eto;
                        eto = delete->next;
                        free(delete);
                }
        }

        free(station->tracks);
        free(station);
}

int select_track(struct station* station, const char* target){
     unsigned int hash = 0;
    for (int i = 0; target[i]; i++) {
        hash = (hash * 31) + target[i];
    }
    return hash % station->track_count;
}

void add_target_capacity(struct station* station,const char* target, int capacity){
        int track = select_track(station, target);
        struct car* new_car = (struct car*)malloc(sizeof(struct car));
    
        strncpy(new_car->value, target, TARGET_SIZE);
        new_car->capacity = capacity;
        new_car->next = NULL; 

        if (station->tracks[track] == NULL) {
        station->tracks[track] = new_car;
        } else {
        new_car->next = station->tracks[track];
        station->tracks[track] = new_car;
    }
}


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

                aktualna = aktualna->next;
        }
        return 0;
}

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

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