#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>

// Define Number of Employees "SIZE" to be 2

#define SIZE 4

// Declare Struct Employee
struct employee {
    int id;
    int age;
    double salary;
};

/* main program */
int main(void) {

    int i, j, k, option = 0, empFound = 0;
    int empCount = 0, empId;
    double new;

    printf("---=== EMPLOYEE DATA ===---\n\n");

    // Declare a struct Employee array "emp" with SIZE elements
    // and initialize all elements to zero
    struct employee emp[SIZE];
    do {
        // Print the option list
        printf("1. Display Employee Information\n");
        printf("2. Add Employee\n");
        printf("3. Update Employee Salary\n");
        printf("4. Remove Employee\n");
        printf("0. Exit\n\n");
        printf("Please select from the above options: ");
        // Capture input to option variable
        scanf("%d", &option);
        printf("\n");
        switch (option) {

        case 0: // Exit the program
            break;

        case 1: // Display Employee Data
                // @IN-LAB
            printf("EMP ID  EMP AGE EMP SALARY\n");
            printf("======  ======= ==========\n");
            for (i = 0; i < empCount; i++) {
                if (emp[i].id > 0)
                    printf("%6d%9d%11.2lf\n", emp[i].id, emp[i].age, emp[i].salary);
            }
            printf("\n");
            // Use "%6d%9d%11.2lf" formatting in a
            // printf statement to display
            // employee id, age and salary of
            // all  employees using a loop construct

            // The loop construct will be run for SIZE times
            // and will only display Employee data
            // where the EmployeeID is > 0
            break;
        case 2: // Adding Employee
                // @IN-LAB
            printf("Adding Employee\n");
            printf("===============\n");
            // Check for limits on the array and add employee
            // data accordingly.
            if (empCount < 4) {
                printf("Enter Employee ID: ");
                scanf("%d", &emp[empCount].id);
                printf("Enter Employee Age: ");
                scanf("%d", &emp[empCount].age);
                printf("Enter Employee Salary: ");
                scanf("%lf", &emp[empCount].salary);
                printf("\n");
                if (emp[empCount].id > 0) {
                    empCount++;
                }
            }
            else
                printf("ERROR!!! Maximum Number of Employees Reached\n\n");
            break;
        case 3:
            printf("Update Employee Information\n");
            printf("======================\n");
            do {
                printf("Enter Employee ID: ");
                scanf("%d", &empId);
                for (j = 0; j < empCount; j++) {
                    if (emp[j].id == empId) {
                        printf("The current salary is %.2lf\n", emp[j].salary);
                        printf("Enter Employee New Salary: ");
                        scanf("%lf", &new);
                        printf("\n");
                        emp[j].salary = new;
                        empFound = 1;
                        j = empCount;
                    }
                }
                if (empFound == 0) {
                    printf("*** ERROR: Employee ID not found! ***\n");
                }
            } while (empFound != 1);
            break;
        case 4:
            printf("Remove Employee\n");
            printf("===============\n");
            do {
                printf("Enter Employee ID: ");
                scanf("%d", &empId);
                for (k = 0; k < empCount; k++) {
                    if (emp[k].id == empId) {
                        printf("Employee %d will be removed\n\n", empId);
                        emp[k].id = 0;
                        k = empCount;
                        empFound = 1;
                    }
                }
                if (empFound == 0) {
                    printf("*** ERROR: Employee ID not found! ***\n");
                }
            } while (empFound != 1);
            break;
        default:
            printf("ERROR: Incorrect Option: Try Again\n\n");
        }
    } while (option != 0);
    printf("Exiting Employee Data Program. Good Bye!!!\n\n");
    return 0;
}