admin.cpp

#include "admin.h"

/*
 *Admin::add_data() function adds student records in the data file. It creates a temp vector of strings to store input datas initially,
 * then it writes the datas into the data file as well as inserts the data into the map data structure that is being used for accessing records in runtime, if needed. 
 */
void Admin::add_data()
{
	ofstream out("sdm_dat.csv", ios_base::app);	//Opening data file in append mode.
	if (out.is_open())
	{
        Student student;
		vector<string> temp;
		cin.ignore();
		adds(5,5);
		cout << "ENTER STUDENT'S DETAILS-" << endl;
		adds(5);
		cout << "------------------------\n"<< endl;
		adds(5,1);
		cout << "STUDENT ID.: ";
		getline(cin, student.id);
		if (file.find(student.id) != file.end())
		{
			adds(5, 1);
			cout << "ID " << student.id << " ALREADY EXISTS." << endl;
			return;
		}
		temp.push_back(student.id);
		adds(5,1);

		cout << "NAME: ";
		getline(cin, student.name);
		temp.push_back(student.name);
		adds(5,1);

		cout << "COURSE: ";
		getline(cin, student.course);
		temp.push_back(student.course);
		adds(5,1);

		cout << "DEPARTMENT: ";
		getline(cin, student.dep);
		temp.push_back(student.dep);
		adds(5,1);

		do{
			cout << "GENDER[M/F/Other]: ";
			cin >> student.gender;
			adds(5,1);
		}while(student.gender!="M" && student.gender!="F" && student.gender!="Other" && student.gender!="m" && student.gender!="f" && student.gender!="other");
		temp.push_back(student.gender);

		cout << "AGE: ";
		cin >> student.age;
		cin.ignore();
		temp.push_back(student.age);
		adds(5,1);

		cout << "PHONE No.: ";
		cin >> student.ph_no;
		temp.push_back(student.ph_no);

		out << student.id << "," << student.name << "," << student.course << "," << student.dep << "," << student.gender << "," << student.age << "," << student.ph_no << endl; //Appending records into data file.
		out.close();
		file.insert({temp[0], temp});
	}
	else
	{
		cout << "Can't open file" << endl;
		exit(1);
	}
}

/*
 * Admin::delete_data() function deletes any student's records by searching student_id,
 * informs user if records of specified student id is not found. If student id found in records, it removes the records of the student from 
 * the records, calls the function write_dat() to write modified datas into file, implementation can be found further below.
 */ 
void Admin::delete_data()
{
	string str;
	adds(5, 5);
	cin.ignore();
	cout << "ENTER THE STUDENT ID TO DELETE : ";
	getline(cin, str);
	if (file.find(str) == file.end())
	{
		adds(5, 1);
		cout << "NO RECORD FOR STUDENT ID \"" << str << "\" EXISTS.\n"
			<< endl;
		return;
	}
	if (file.erase(str))
	{
		write_dat();
		adds(5, 1);
		cout << "STUDENT ID \"" << str << "\" RECORDS DELETED SUCCESSFULLY.\n"
			<< endl;
		return;
	}
	adds(5, 1);
	cout << "FACING SOME UNKNOWN PROBLEM, PLEASE TRY AGAIN.\n"
		<< endl;
}

/*
 * Admin::update_data() function modifies and updates records by searching Id, informs if no such id found. 
 * If found, provides multiple options to update records. User can perform multiple modifications of records,
 * as well as option to revert back to original state is also given so that wrong updation can be avoided.
 */
void Admin::update_data()
{
	string id,val;
	vector<string> temp;
	char ch;
	adds(5,5);
	cin.ignore();
	cout<<"ENTER THE STUDENT ID TO UPDATE: ";
	getline(cin,id);
	if(file.find(id)==file.end())
	{
		adds(5,1);
		cout<<"NO RECORD FOR STUDENT ID \""<<id<<"\" EXISTS.\n"<<endl;
		return;
	}
	temp=file.at(id);
	do{
		system("clear");
		print_label(4);
		adds(8,3);
		cout<<"|| UPDATING STUDENT ID \""<<id<<"\" RECORDS. ||"<<endl;
		adds(0, 3);
		cout << "ID";
		adds(5);
		cout << "NAME";
		adds(5);
		cout << "COURSE";
		adds(3);
		cout << "DEPARTMENT";
		adds(3);
		cout << "GENDER";
		adds(2);
		cout << "  AGE";
		adds(2);
		cout << " PH_No." << endl;
		for (int i = 0; i < tot + 12; i++)
			cout << "-";
		cout << "\n"
			 << endl;
			print(temp);
		for (int i = 0; i < tot + 12; i++)
			cout << "-";
		cout << "\n"
			 << endl;

		adds(5,3);
		cout<<"UPDATE =>";
		adds(1);cout<<"1. NAME";
		adds(1);cout<<"2. COURSE";
		adds(1);cout<<"3. DEPARTMENT";
		adds(1);cout<<"4. GENDER";
			adds(1);cout<<"5. AGE";
		adds(1);cout<<"6. PHONE No.";
		adds(5,2);
		cout<<"RETURN =>";
		adds(1);cout << "7. UPDATE & RETURN";adds(1);cout << "8. ABORT ALL CHANGES & RETURN"<<endl;
		adds(5,2);
		cout<<"ENTER YOUR CHOICE: ";
		cin>>choice;
		cin.ignore();
		adds(5,2);
		if(choice>='1' && choice<='6')
			cout<<"ENTER NEW VALUE FOR- "<<endl;
		adds(5,1);
		switch(choice)
		{
			case '1':
				cout<<"NAME: ";
				getline(cin,val);
				temp[1]=val;
				break;
			case '2':
				cout<<"COURSE: ";
				getline(cin,val);
				temp[2]=val;
				break;
			
			case '3':
				cout<<"DEPARTMENT: ";
				getline(cin,val);
				temp[3]=val;
				break;
			
			case '4':
				do{
					cout<<"GENDER(M/F/Other): ";
					getline(cin,val);
				}while(val!="M" && val!="m" && val!="F" && val!="f" && val!="Other" && val!="other");
				temp[4]=val;
				break;

			case '5':
				cout<<"AGE: ";
				cin>>val;
				cin.ignore();
				temp[5]=val;
				break;
			
			case '6':
				cout<<"PHONE No.: ";
				cin>>val;
				cin.ignore();
				temp[6]=val;
				break;

			case '7':
				break;

			case '8':
				adds(5,1);
				cout<<"ALL CHANGES ABORTED. RECORDS OF \""<<id<<"\" NOT EFFECTED."<<endl;
				return;
			
			default:
				cout<<"INVALID CHOICE FROM GIVEN OPTIONS."<<endl;
		}
			if(choice=='7')
				break;
			val.clear();
			adds(5,1);
			cout<<"UPDATE MORE VALUES?(Y/N): ";
			cin>>ch;
			cin.ignore();
	}while(ch=='Y' || ch=='y');
	file.at(id)=temp;
	write_dat();
	adds(5,1);
	cout<<"\""<<id<<"\" RECORDS UPDATED SUCCESSFULLY."<<endl;
}

/*
 * load_dat() function is called from the constructor,it loads all data from the data file to a map data structure.
 */
void Admin::load_dat()
{
	in.open("sdm_dat.csv", ios::binary | ios::in);
	if (!in.is_open())
	{
		out.open("sdm_dat.csv");
		if (out.is_open())
		{
			out.close();
			return;
		}
		cout << "SOME PROBLEM OCCURED WHILE OPENING THE DATAFILE." << endl;
		exit(1);
	}
	string str;
	while (getline(in, str))
	{
		vector<string> line;
		line = split(str);
		file.insert({line[0], line});
		//		for(auto it:file[line[0]])
		//			cout<<it<<" ";
		//		cout<<endl;
		//	print(line);
		//	print(file[line[0]]);
	}
	in.close();
}

/*
 * write_dat() function writes all data from the map to the data_file. It is called from the Admin::update_data() & Admin::delete_data() functions.
 */
void Admin::write_dat()
{
	ofstream tmp;
	tmp.open(".tmp_dat.csv", ios::binary | ios::out);
	for (auto it : file)
	{
		vector<string> line = it.second;
		string last = line.back();
		for (auto str : line)
		{
			if(str == last)
				tmp << str << endl;
			else
				tmp << str << ",";
		}
	}
	tmp.close();
	remove("sdm_dat.csv");
	rename(".tmp_dat.csv", "sdm_dat.csv");
}

/*
 * Admin::view_data function shows total data in a table format
 */
void Admin::view_data()
{
	if(file.empty())
	{
		adds(5, 5);
		cout << "NO RECORDS TO SHOW, DATAFILE IS EMPTY.\n"
			<< endl;
		return;
	}
	adds(0, 5);
	cout << "ID";
	adds(5);
	cout << "NAME";
	adds(5);
	cout << "COURSE";
	adds(3);
	cout << "DEPARTMENT";
	adds(3);
	cout << "GENDER";
	adds(2);
	cout << "  AGE";
	adds(2);
	cout << " PH_No." << endl;
	for (int i = 0; i < tot + 12; i++) cout << "-";
	cout << "\n"<< endl;
	for (auto it : file)
		print(it.second);
	for (int i = 0; i < tot + 12; i++) cout << "-";
	cout << "\n"<< endl;
}

/*
 * Admin::search() function searches a particular student's data by their ID.
 */
void Admin::search()
{
	string id;
	adds(5,5);
	cin.ignore();
	cout<<"ENTER THE STUDENT ID TO SEARCH: ";
	getline(cin,id);
	if(file.find(id)==file.end())
	{
		adds(5,1);
		cout<<"STUDENT ID \""<<id<<"\" NOT FOUND."<<endl;
		return;
	}
	adds(0,4);
	load_view(tot);
	print(file.at(id));
	for (int i = 0; i < tot + 12; i++)
		cout << "-";
	cout << "\n"<< endl;
}

/*
 * Admin::print() function receives vector of strings as parameter and prints the data. It is called from other functions like Admin::view_data() for printing records.
 * It arranges each data records by caculating spaces required to place the fields in a professional manner.
 */
void Admin::print(vector<string> &line)
{
	for (int i = 0; i < line.size(); i++)
	{
		cout << line[i];
		int n = abs(int(sp[i] - line[i].size()));
		for (int j = 0; j < n; j++)
			cout << " ";
	}
	cout << "\n"
		<< endl;
}

/*
 * Admin::split() function receives string as parameter and returns a vector of strings by splitting the received string. Though there are functions for 
 * splitting available in cpp, this function is implemented for learning and interest.
 */
vector<string> Admin::split(string str)
{
	string s;
	vector<string> temp;
	for (int i = 0; i < str.length(); i++)
	{
		if(str[i] != ',')
			s.push_back(str[i]);
		else
		{
			temp.push_back(s);
			s.clear();
		}
	}
	temp.push_back(s);
	return temp;
}

/*
 * Admin::menu() function shows the main menu
 */
void Admin::menu()
{
	char ch;
	do
	{
		system("clear");
		print_label(0);
		adds(s2, 2);
		cout << "1. ADD STUDENT RECORD\n\n";
		adds(s2);
		cout << "2. VIEW RECORDS\n\n";
		adds(s2);
		cout << "3. DELETE STUDENT RECORD\n\n";
		adds(s2);
		cout << "4. UPDATE RECORD\n\n";
		adds(s2);
		cout<<"5. SEARCH\n\n";
		adds(s2);
		cout << "6. EXIT\n\n"<< endl;
		adds(s2);
		cout << "ENTER YOUR CHOICE: ";
		cin >> choice;

		switch (choice)
		{
			case '1':
				do
				{
					system("clear");
					print_label(1);
					add_data();
					adds(5, 2);
					cout << "ADD MORE RECORDS?(Y/N): ";
					cin >> ch;
				} while (ch != 'n' && ch != 'N');
				//			load_dat();
				break;
			case '2':
				system("clear");
				print_label(2);
				view_data();
				break;
			case '3':
				system("clear");
				print_label(3);
				delete_data();
				break;
			case '4':
				system("clear");
				print_label(4);
				adds(5, 1);
				update_data();
				break;
			case '5':
				do{
					system("clear");
					print_label(5);
					adds(5,1);
					search();
					adds(5,2);
					cout<<"SEARCH AGAIN?(Y/N): ";
					cin>>ch;
				}while(ch != 'n' && ch != 'N');
				break;
			case '6':
				break;
			default:
				adds(s2, 1);
				cout << "INVALID CHOICE. " << endl;
		}
		if(choice == '6')
			break;
		//		cin.ignore();
		adds(5, 1);
		cout << "RETURN TO MAIN MENU?(Y/N) : ";
		cin >> ch;
	} while (ch != 'n' && ch != 'N');
}
/*
 * Admin::Admin(), the constructor of the Admin class calls the function Admin::load_dat() to load all records in a map data structure.
 */
Admin::Admin()
{
	load_dat();
	tot = 0;
	for (auto it : sp) tot += it;
	menu();
}

// Admin::~Admin()
//{
//	adds(5,1);
//	cout<<"ADMIN LOGGING OUT. "<<endl;
//}

/*
 * Admin::adds() function receives two integer parameters, no. of tabs and new lines. This is convenience as anyone can pass values as per their requirements for
 * acceptable decent looking interface.
 */
void Admin::adds(int t, int n)
{
	t = t * 4;
	for (int i = 0; i < n; i++)
		cout << "\n";
	for (int i = 0; i < t; i++)
		cout << " ";
}