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

struct car* create_car(const char* target) {
    struct car* new_car = (struct car*)malloc(sizeof(struct car));
    if (new_car != NULL) {
        strncpy(new_car->value, target, SIZE - 1);
        new_car->value[SIZE - 1] = '\0';
        new_car->next = NULL;
    }
    return new_car;
}

struct car* add_car(struct car* first, const char* target) {
    struct car* new_car = create_car(target);
    if (new_car == NULL) {
        printf("Nedostatok pamäte pre nový vozeň!\n");
        return first;
    }

    if (first == NULL) {
        return new_car;
    }

    struct car* current = first;
    while (current->next != NULL) {
        current = current->next;
    }

    current->next = new_car;

    return first;
}

void print_train(struct car* first) {
    struct car* current = first;
    if (current == NULL) {
        printf("Vlak je prázdny.\n");
        return;
    }

    while (current != NULL) {
        printf("Vozeň cieľovej stanice: %s\n", current->value);
        current = current->next;
    }
}

void cancel_train(struct car* first) {
    struct car* current = first;
    struct car* next_car;

    while (current != NULL) {
        next_car = current->next;
        free(current);
        current = next_car;
    }
}

struct car* clear_train(struct car* first, const char* target) {
    struct car* current = first;
    struct car* prev = NULL;

    while (current != NULL) {
        if (strcmp(current->value, target) == 0) {
            if (prev == NULL) {
                first = current->next;
            } else {
                prev->next = current->next;
            }
            struct car* temp = current;
            current = current->next;
            free(temp);
        } else {
            prev = current;
            current = current->next;
        }
    }

    return first;
}