#include <algorithm>
#include <iomanip>
#include <cstdlib>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cctype>
#include <fstream>

using namespace std;

int main()
{

	string strOpt, strFileName, strInfo = "";
	string strFirstName, strMiddleName, strLastName, strID, strClass, strClasses, strSearch;
	vector <string> vecName, vecFirstName, vecMiddleName, vecLastName, vecClass, vecClasses, vecData, vecID;
	ifstream FileIn;
	ofstream FileOut;
	int intStudent, intCounter, intClass;

	const char READING = 'A', ADDING = 'B', DISPLAYING = 'C', SORTING = 'D', SAVING = 'E', SEARCHING = 'F', EXITING = 'G';
	do
	{
		//this is a reference table that allows users to view all the capabilities of the app
		cout << "\tStudent Enrollment Application\n\n";
		cout << "A. Reading an external student list\n";
		cout << "B. Adding student's informations into student list\n";
		cout << "C. Displaying student list\n";
		cout << "D. Sorting student list\n";
		cout << "E. Saving student list to a file\n";
		cout << "F. Searching from student list\n";
		cout << "G. Exit the application\n\n";

		cout << "What would you like to perform? ";
		getline(cin, strOpt);

		switch (toupper(strOpt[0]))

		{
			//allows you to add a student list and see how many poeple are on it
		case READING:
			//This opens the file.
			cout << "\nPlease enter the file's name you would like to open: ";
			getline(cin, strFileName);
			FileIn.open(strFileName.c_str());

			// This gives you an error if the file name typed is incorrect
			if (!FileIn)
			{
				FileIn.clear();
				cout << "Could not find file name! Please re-enter the file name: ";
				getline(cin, strFileName);
				FileIn.open(strFileName.c_str());

			}

			// This tells you if you've typed in the correct password.
			if (FileIn)
			{
				cout << "\nThat's the correct file name!";
			}

			cout << "\nOpened Successfully! \n";

			while (getline(FileIn, strFileName))

				if (strOpt == "|")
				{
					strOpt = "\t";
					strInfo += "\t\t";

				}
			cout << strFileName << endl;
			//This tells you how many students are within the list.
			cout << "\nReading is successful! \n";
			cout << "\nThe size of the list is: " << vecData.size() << endl << endl;
			break;

			// This case allows you to add more students to the list
		case ADDING:

			//asks how many students you want to add
			cout << "How many Students would you like to add:";
			cin >> intStudent;
			cin.ignore();

			//if you input something other than a number this will prevent the app from continuing
			while (cin.fail())
			{
				cout << "Invalid Choice.  Select again: ";
				cin.clear();
				cin.ignore(std::numeric_limits<int>::max(), '\n');
				cin >> intStudent;
				cin.ignore();
			}

			//allows you to add students to the list
			for (int i = 0; i < intStudent; i++)
			{

				cout << "\nStudent " << i + 1 << ":";
				cout << "\nPlease enter the Student's First Name: ";
				getline(cin, strFirstName);
				vecFirstName.push_back(strFirstName);
				cout << "\nPlease enter the Student's Middle Name: ";
				getline(cin, strMiddleName);
				vecMiddleName.push_back(strMiddleName);
				cout << "\nPlease enter the Student's Last Name: ";
				getline(cin, strLastName);
				vecLastName.push_back(strLastName);
				cout << "\nPlease enter the Student's ID: ";
				getline(cin, strID);
				vecID.push_back(strID);
				cout << "\nHow many classes for this student? ";
				getline(cin, strClass);
				vecClass.push_back(strClass);
				cout << "\nPlease enter the Studnet's class: ";
				getline(cin, strClasses);
				vecClasses.push_back(strClasses);

				vecName.push_back(strFirstName + "\t" + strMiddleName + "\t" + strLastName + "\t");
			}
			break;

			//this displays student list
		case DISPLAYING:
			if (vecData.size() == 0)
			{
				cout << "\nThe list is empty! Perhaps you need to load information into the list.\n\n";
			}
			for (int i = 0; i < vecData.size(); i++)
				cout << vecData[i] << endl;
			break;

			//This case sorts the students by their names.
		case SORTING:

			//If a file was not loaded, this causes an error message to occur.
			if (vecData.size() == 0)
			{
				cout << "\nThe list is empty! Please load a file.\n\n";
			}

			//This will sort the students by their names.
			else
			{
				sort(vecData.begin(), vecData.end());
				sort(vecName.begin(), vecName.end());
				cout << "This list was successfuly sorted.\n\n";
			}
			break;

			//This case allows for you to create a new save file
		case SAVING:
			cout << "\nPlease enter a file name: ";
			getline(cin, strOpt);
			FileOut.open(strOpt.c_str());

			for (int i = 0; i < vecData.size(); i++)
				FileOut << vecData[i] << endl;
			FileOut.close();
			break;

			//This case lets you search students on the list by their name
		case SEARCHING:
			char response;

			// This provides an error message if students could not be found.
			if (vecData.size() == 0)
			{
				cout << "\nThe list is empty! Perhaps you need to load information into the list.\n\n";
			}

			// This allows for you to search the names of students.
			else
			{
				do
				{
					cout << "\nPlease enter the name to be searched: ";
					getline(cin, strSearch);

					if (binary_search(vecName.begin(), vecName.end(), strSearch))
					{
						cout << "\nThe name: " + strSearch + " was found in the Student List.\n";
					}
					else
					{
						cout << "\nThe name: " + strSearch + " could not be found in the Student List.\n";
					}

					cout << "\nWould you like to search more?\nPlease enter Y for Yes, and N for No: ";
					cin >> response;
					cin.ignore();
				} while (response == 'Y' || response == 'y');
			}
			break;
			//exiting lab section that allows you to terminate the app or continue
		case EXITING:
			cout << "\nExiting application!";
			cout << "\nAre you sure to exit this application? Yes or No: ";
			cin >> response;
			cin.ignore();
			while (response == 'Y' || response == 'y');
			break;

		default:
			cout << "\nInvalid Input! \n\n";
			break;
		}
	} while (toupper(strOpt[0]) != EXITING);

	cout << "\nApplication is terminating. \n";


	return 0;
}