#include <stdio.h>
#include <stdlib.h>
FILE *empinfo;

struct employeeData {
    int EMP_ID;
    char name[20];
    int dept;
    int rank;
    double salary;
    struct employeeData *next;
};

struct employeeData *head = NULL;

void initializeList();
void add();
void deleteEmp(int ID);
void modify(int ID, double NewSalary);
void query(int rank);
void print();

void main(){

    int choice=1, ID, rank;
    double newSalary;

    initializeList();

    while (choice != 0) {
        printf("1-Add 2-Delete 3-Modify 4-Query 5-Print 0-Exit\n");
        scanf("%d", &choice);

        if (choice == 1) {
            add();
        }
        else if (choice == 2){
            printf("Enter employee ID to delete: ");
            scanf("%d", &ID);
            deleteEmp(ID);
        }
        else if (choice == 3){
            printf("Enter employee ID to modify: ");
            scanf("%d", &ID);
            printf("Enter new salary amount: ");
            scanf("%lf", &newSalary);
            modify(ID,newSalary);
        }
        else if (choice == 4){
            printf("Enter the rank you wish to query: ");
            scanf("%d", &rank);
            query(rank);
        }
        else if (choice == 5){
            print();
        }
    }
    printf("Goodbye...\n");
    return;
}

void initializeList(){
    head = NULL;
    empinfo=fopen("empinfo.txt", "r");
    head = (struct employeeData *)malloc(sizeof(struct employeeData));
    head->next = NULL;

    struct employeeData *tempPtr = head;

    while (tempPtr->EMP_ID != 0){
        fscanf(empinfo, "%d %s %d %d %lf", &tempPtr->EMP_ID, &tempPtr->name, &tempPtr->dept, &tempPtr->rank, &tempPtr->salary);
        printf("%d %s %d %d %lf\n", tempPtr->EMP_ID, tempPtr->name, tempPtr->dept, tempPtr->rank, tempPtr->salary);
        if (tempPtr->EMP_ID == 0){
            free(tempPtr);
            break;
            }
        tempPtr->next = (struct employeeData *)malloc(sizeof(struct employeeData));
        tempPtr=tempPtr->next;
    }
}

void add(){
}
void deleteEmp(int ID){
}
void modify(int ID, double NewSalary){
}
void query(int rank){
}
void print(){
}