/* This program loads a file into an array of structs,
 * and is able to sort that array by name and salary size.
 */

#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

struct Employee {
    int id;
    string firstName;
    string lastName;
    int salary;
};



void opener(ifstream &reader) {
    reader.open("employees.txt");

    if( reader.fail() )
        cout << "The file employees.txt is not located in the program folder.\n"
             << "Please put emplyees.txt in the program folder and try again." << endl;
}

void getEmployees(ifstream &reader, Employee employees[], const int len) {
    for( int i = 0 ; i < len ; i++ )
        reader >> employees[i].id >> employees[i].firstName
               >> employees[i].lastName >> employees[i].salary;
}

void empPrintByName(const Employee employees[], const int len) {
    for( int i = 0 ; i < len ; i++ )
        cout << "ID: " << employees[i].id << " First Name: " << employees[i].firstName
             << " Last Name: "<< employees[i].lastName << " Salary: " << employees[i].salary << endl;
}

void sorter(Employee employees[], bool (*compare)(Employee, Employee), const int len) {
    for( int i = 0 ; i < len - 1 ; i++ ) {
        int minIndex = i;

        for( int j = i ; j < len ; j++ )
            if( compare(employees[minIndex], employees[j]) )
                minIndex = j;

        Employee temp = employees[i];
        employees[i] = employees[j];
        employees[j] = temp;
    }
}

bool empSortByName(const Employee a, const Employee b) {
    return a.lastName > b.lastName;
}

bool empSortBySal(const Employee a, const Employee b) {
    return a.salary > b.salary;
}



int main() {
    Employee allEmployees[6];
    ifstream empReader;

    opener(empReader);
    getEmployees(empReader, allEmployees, 6);

    sorter(allEmployees, empSortByName, 6);
    empPrintByName(allEmployees, 6);

    sorter(allEmployees, empSortBySal, 6);
    empPrintByName(allEmployees, 6);
}