#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
#define MAXEMPLOYEES 130
 
using namespace std;
 
struct employee
{
    string Name;
    int ID;
    char Salary;
    float PayRate;
    string Department;
    string Title;
};
 
int main(void);
void menuStart(void);
int menuChoice(void);
 
int readEmployeeFile(employee personnel[]);  
void displayEmployeeByElement(employee personnel[], int element);
void searchEmployeeByID(employee personnel[], int numEmployees);
void searchEmployeeBySalary(employee personnel[], int numEmployees);
void groupEmployeesByDepartment(employee personnel[], int numEmployees);
void sortEmployeesByIDandDisplay(employee personnel[], int numEmployees);
void sortEmployeesByIDandDisplayByGroup(employee personnel[], int numEmployees);
void groupEmployeesByTitle(employee personnel[], int numEmployees);
void printOut(employee personnel[]);
 
/*
 * Main function
 */
int main()
{
    menuStart();
}
 
/*
 * Function to start the menu
 */
void menuStart(void)
{
    int choice, numEmployees;
    struct employee personnel[MAXEMPLOYEES];
    numEmployees = readEmployeeFile(personnel);
 
    while(choice != 8)			
	{
    	choice = menuChoice();
    	// switch statement for menu items
        switch(choice)
        {
            case 1:
                searchEmployeeByID(personnel, numEmployees);
                break;
            case 2:
                searchEmployeeBySalary(personnel, numEmployees);
                break;
            case 3:
                groupEmployeesByDepartment(personnel, numEmployees);
                break;
            case 4:
                sortEmployeesByIDandDisplay(personnel, numEmployees);
            	break;
            case 5:
                sortEmployeesByIDandDisplayByGroup(personnel, numEmployees);
                break;
            case 6:
                 groupEmployeesByTitle(personnel, numEmployees);
            	break;
           	case 7:
                break;
            case 8:
                break;
            default:
            	cout << "PLEASE CHOOSE FROM OPTIONS 1-8." << endl << endl;
            	break;
        }
    }
 
    system("pause");
    exit(0);
}
 
/*
 * Reads data from "empdata.txt" into an array
 */
int readEmployeeFile(employee personnel[])
{
    ifstream inFile;
    inFile.open("empdata.txt");
    if (!inFile)
    {
        cout << "Error: Cannot open \"empdata.txt\" for input." << endl;
        return -1;
    }
 
    int i = 0;
    while(inFile.good())
    {
        getline(inFile, personnel[i].Name);
        inFile >> personnel[i].ID;
		inFile >> personnel[i].Salary;
		inFile >> personnel[i].PayRate;
		inFile.ignore();
		getline(inFile, personnel[i].Department);
		getline(inFile, personnel[i].Title);
 
		i++;	
	}
 
	return i;
}
 
/*
 * Menu
 */
int menuChoice(void)		
{
	int choice;
    cout << setw(80) << setfill('*') << "" << endl;
	cout << "1. Search for an employee by their ID number." << endl;
	cout << "2. Display employees' names according to salary." << endl;
	cout << "3. Group employees by department." << endl;
	cout << "4. Sort data by ascending employee ID numbers, display names and IDs." << endl;
	cout << "5. List of employees sorted by ID # and department." << endl;
	cout << "6. Display employees, by name, of a particular title." << endl;
	cout << "7. Add a new employee." << endl;
    cout << "8. Quit and Print." << endl << endl;
    cout << setw(80) << setfill('*') << "" << endl;
	cout << "Choose 1-8: ";
	cin >> choice;
	cout << endl;
	return choice;
}
 
/*
 * Displays a particular employee by using their position in the array.
 */ 
void displayEmployeeByElement(employee personnel[], int element)
{
     cout << personnel[element].Name << endl;
     cout << personnel[element].ID << endl;
     cout << personnel[element].Salary << endl;
     cout << personnel[element].PayRate << endl;
     cout << personnel[element].Department << endl;
     cout << personnel[element].Title << endl;
}
 
/*
 * Loops through the struct to find an employee matching a certain ID number
 */
void searchEmployeeByID(employee personnel[], int numEmployees)
{
     cout << "Enter the ID of the employee you wish to view: ";
     int requestedID;
     cin >> requestedID;
     cout << endl;
     
     for (int i = 0; i < numEmployees; i++)
     {
        if (personnel[i].ID == requestedID)
         {
             cout << "Name: " << personnel[i].Name << ", " << "Department: " << personnel[i].Department << ", " << "Title: " << personnel[i].Title << "\n\n";
             return;
         }
        if (personnel[i].ID != requestedID) 
         {
             cout << "Matching ID number was not found." << endl << endl;
             return;
         }
     }
 
     return;
}
 

// Loops through the struct to find employees matching certain salary levels.

void searchEmployeeBySalary(employee personnel[], int numEmployees)
{
    // ******* NEED TO SORT THE ARRAY HERE ******
    // If pers[x].PayRate > pers[x + 1].PayRate
    //   - swap the two elements
    cout << "Enter the lowest salary you wish to view: ";
    int lowestSalary;
    cin >> lowestSalary;
    cout << endl;
    
    for (int i = 0; i < numEmployees; i++)
    {
        if (personnel[i].PayRate >= lowestSalary)
        {
            displayEmployeeByElement(personnel, i);
            cout << endl;
        }
    }
 
    return;
}
//Displays all employees who work in a certain department.
void groupEmployeesByDepartment(employee personnel[], int numEmployees)
{
     cout << "Enter the Department you wish to view: ";
     string requestedDepartment;
     cin >> requestedDepartment;
     cout << endl;
     
     for(int i = 0; i < numEmployees; i++)
     {
             if (personnel[i].Department == requestedDepartment)
             {
                cout << personnel[i].Name << endl;
             }  
     }      
     cout << endl;
     return;   
}     
 
/*
 * Sorts employees in Ascending order and displays each employee's name and ID number
 */
void sortEmployeesByIDandDisplay(employee personnel[], int numEmployees)
{
    ;
}
 

/*Sorts employees in ascending order by ID number and displays names,
 ID numbers, and bi-weekly pay... all grouped by department*/
void sortEmployeesByIDandDisplayByGroup(employee personnel[], int numEmployees)
{
    ;
}
//Displays all employees of a certain Title. 
void groupEmployeesByTitle(employee personnel[], int numEmployees)
{
     cout << "Enter the Title you wish to view: ";
     string requestedTitle;
     cin >> requestedTitle;
     //getline(cin, requestedTitle);
     cout << endl;
     
     for (int i = 0; i < numEmployees; i++)
     {
             if (personnel[i].Title == requestedTitle)
             {
                cout << personnel[i].Name << endl;
             }  
     }      
     cout << endl;
     return;   
}     

//Prints to output file "empoutput.txt" 
void printOut(employee personnel[])
{
     ;
}