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

//Создание узла
typedef struct Stud {
    char *first_name, *last_name;
    int year, month, day;
    double av_grade;
    struct Stud *next;
} Stud;

//Добавление узла
void push(Stud **head, char *first_name, char *last_name, int year, int month, int day, double av_grade) {
    Stud *tmp = (Stud*) malloc(sizeof(Stud));
    tmp -> first_name = (char*) malloc(strlen(first_name));
    strcpy(tmp -> first_name, first_name);
    tmp -> last_name = (char*) malloc(strlen(last_name));
    strcpy(tmp -> last_name, last_name);
    tmp -> year = year;
    tmp -> month = month;
    tmp -> day = day;
    tmp -> av_grade = av_grade;
    tmp -> next = *head;
    *head = tmp;
}

void write_to_file(Stud *head, FILE *target){
    while (head != NULL) {
        fprintf(target, "%s\r\n", head -> first_name);
        fprintf(target, "%s\r\n", head -> last_name);
        fprintf(target, "%d ", head -> year);
        fprintf(target, "%d ", head -> month);
        fprintf(target, "%d\r\n", head -> day);
        fprintf(target, "%lf\r\n", head -> av_grade);
        head = head -> next;
    }
}

//Вывод списка
void printList(Stud *head) {
    while (head) {
        printf("First name: %s", head -> first_name);
        printf("Last name: %s", head -> last_name);
        printf("Date of Birth: %d %d %d\n", head-> day, head -> month, head -> year);
        printf("Av_grade: %lf\n\n", head -> av_grade);
        head = head -> next;
    }
    printf("\n");
}

int main() {

    Stud *head = NULL;
    char  first_name[50], last_name[50], name_file[100], buf[10];
    int year, month, day;
    double av_grade;

    FILE *source;
    while(1) {
        int act;
        scanf("%d", &act);

        switch (act) {
            //Чтение из файла
            case 1: {
                printf("Enter file name:\n");
                scanf("%s", name_file);
                //printf("%s", name_file);

                if ((source = fopen(name_file, "rw")) == NULL)
                    printf("File error!");

                while (fgets(first_name, 64, source) != NULL) {
                    fgets(last_name, 64, source);
                    fgets(buf, 10, source);
                    year = atoi(buf);
                    fgets(buf, 10, source);
                    month = atoi(buf);
                    fgets(buf, 10, source);
                    day = atoi(buf);
                    fgets(buf, 10, source);
                    av_grade = atof(buf);

                    push(&head, first_name, last_name, year, month, day, av_grade);

                }
                fclose(source);
            }
            case 2: {
                printf("New file name:\n");
                scanf("%s", name_file);
                FILE *target;
                target = fopen(name_file, "wb");
                write_to_file(head, target);
                fclose(target);
            }

   /*         case 3:
                printList(head);*/
            case 4: {
                printf("Surname, first name:\n");
                scanf("%s %s", last_name, first_name);
                sprintf(last_name, "%s%s", last_name, "\n\0");
                sprintf(first_name, "%s%s", first_name, "\n\0");
                printf("Enter date of birth (DD MM YYYY):\n");
                scanf("%d %d %d", &day, &month, &year);
                printf("Grade point average:\n");
                scanf("%lf", &av_grade);

                push(&head, first_name, last_name, year, month, day, av_grade);
            }
            case 5: {
                printf("Base Plot File:\n");
                scanf("%s", name_file);
                source = fopen(name_file, "r");

                while (fgets(first_name, 64, source) != NULL) {
                    fgets(last_name, 64, source);
                    fgets(buf, 10, source);
                    year = atoi(buf);
                    fgets(buf, 10, source);
                    month = atoi(buf);
                    fgets(buf, 10, source);
                    day = atoi(buf);
                    fgets(buf, 10, source);
                    av_grade = atof(buf);

                    push(&head, first_name, last_name, year, month, day, av_grade);
                }
            }

            case 6: {

            }

            case 8:
                return 0;
        }
    }

    return 0;
}