ADDED FEATURES

using System;
using System.Collections.Generic;
using System.IO;
//using System.Windows.Forms;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
// Pag di siya nag-reference sa using System.Windows.Forms, all you need to do is just go to Project > Add Windows Form.


/*
 * MACHINE PROBLEM: EnrollIt
 * For IT111P - OOP 1 - A54
 * Lajato, Arciaga, Tangunan
 */

namespace IT111P_MP_EnrRollIT
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Title = "EnrollIt - Academic Enrollment";

            List<Student> students = new List<Student>();
            List<Course> courses = new List<Course>() {
                new Course() { CourseCode = "COM210", CourseName = "Communication Arts", CourseCost = 1001, Students = new List<Student>() },        // [0]
                new Course() { CourseCode = "COM150", CourseName = "Radio and Television", CourseCost = 1008, Students = new List<Student>() },      // [1]
                new Course() { CourseCode = "MMA101", CourseName = "Intro to Multimedia", CourseCost = 1004, Students = new List<Student>() },       // [2]
                new Course() { CourseCode = "MMA160", CourseName = "Audio/Video Production", CourseCost = 1018, Students = new List<Student>() },    // [3]
                new Course() { CourseCode = "CS101", CourseName = "Introduction to CS", CourseCost = 1010, Students = new List<Student>() },         // [4]
                new Course() { CourseCode = "CS152", CourseName = "Human-Computer Interaction", CourseCost = 1024, Students = new List<Student>() }, // [5]
                new Course() { CourseCode = "IT111P", CourseName = "C# Programming", CourseCost = 1012, Students = new List<Student>() },            // [6]
                new Course() { CourseCode = "IT112P", CourseName = "Windows Forms", CourseCost = 1016, Students = new List<Student>() },             // [7]
                new Course() { CourseCode = "MATH004", CourseName = "Quick Maths", CourseCost = 1006, Students = new List<Student>() },              // [8]
                new Course() { CourseCode = "MATH022", CourseName = "Calculus", CourseCost = 1008, Students = new List<Student>() },                 // [9]
                new Course() { CourseCode = "MATH025", CourseName = "Theoretical Mathematics", CourseCost = 1014, Students = new List<Student>() },  // [10]
                new Course() { CourseCode = "MEC101", CourseName = "Mechanics", CourseCost = 1016, Students = new List<Student>() },                 // [11]
                new Course() { CourseCode = "ECE101", CourseName = "Circuits", CourseCost = 1022, Students = new List<Student>() },                  // [12]
                new Course() { CourseCode = "DRAW022", CourseName = "Drawing for Architecture", CourseCost = 1020, Students = new List<Student>() }  // [13]
            };
            List<Curriculum> curricula = new List<Curriculum>() {
                new Curriculum() { CourseProgram = "IT", Courses = new List<Course>(){ courses[0], courses[4], courses[5], courses[6], courses[7], courses[8], courses[9] } },
                new Curriculum() { CourseProgram = "CS", Courses = new List<Course>(){ courses[0], courses[4], courses[5], courses[6], courses[7], courses[8], courses[9] } },
                new Curriculum() { CourseProgram = "MMA", Courses = new List<Course>(){ courses[0], courses[2], courses[3], courses[4], courses[8] } },
                new Curriculum() { CourseProgram = "COMM", Courses = new List<Course>(){ courses[0], courses[1], courses[2], courses[3], courses[4], courses[8] } },
                new Curriculum() { CourseProgram = "ME", Courses = new List<Course>(){ courses[0], courses[4], courses[8], courses[9], courses[10], courses[11] } },
                new Curriculum() { CourseProgram = "CPE", Courses = new List<Course>(){ courses[0], courses[2], courses[4], courses[6], courses[8], courses[9], courses[10], courses[12] } },
                new Curriculum() { CourseProgram = "ECE", Courses = new List<Course>(){ courses[0], courses[2], courses[6], courses[8], courses[9], courses[10], courses[12] } },
                new Curriculum() { CourseProgram = "AR", Courses = new List<Course>(){ courses[0], courses[2], courses[6], courses[8], courses[9], courses[10], courses[13] } }
            };

            int IDcount = 0;

           // MessageBox.Show("Welcome to EnrollIt.!", "EnrollIt");

            MainMenu(students, courses, curricula, ref IDcount);
            Console.ReadKey();
        }
        static void MainMenu(List<Student> students, List<Course> courses, List<Curriculum> curricula, ref int ic)
        {
            int input = ' '; int sid = 0, co = 0;
            do
            {
                Console.Clear();
                Console.WriteLine
                    ("Welcome to EnrollIt.!" + "\n\n" +
                     "[1] Register Student\n" +
                     "[2] View Student Info\n" +
                     "[3] View Curriculum\n" +
                     "[4] Enroll in a course\n" +
                     "[5] Show class list\n" +
                     "[6] View Enrolled Subjects\n" +
                     "[7] View Account Balances\n" +
                     "[8] Pay account balances\n" + "\n" +
                     "[9] Remove A Student From A course\n" +
                     "[10] Remove A Student\n" +
                     "[11] Admin's Menu\n"+
                     "[0] Quit\n");
                Console.Write("Enter choice: ");
                try
                {
                    input = int.Parse(Console.ReadLine());
                    switch (input)
                    {
                        case 1:
                            // Register Student
                            Console.WriteLine("Register Student");
                            EnterStudent(students, curricula, ref ic);
                            break;
                        case 2:
                            // View Student Info
                            Console.WriteLine("View Student Info");
                            ViewStudentInfo(students);
                            break;
                        case 3:
                            // View Curriculum
                            Console.WriteLine("View Curriculum");
                            ViewCurriculum(students, curricula, ref sid, ref co);
                            break;
                        case 4:
                            // Enroll in a Course
                            Console.WriteLine("Enroll in a Course");
                            EnrollInCourse(students, courses, curricula, ref sid, ref co);
                            break;
                        case '+':
                            // Evaluate course grades
                            Console.WriteLine("Evaluate course grades");
                            break;
                        case 5:
                            // Show class list
                            Console.WriteLine("Show class list");
                            ShowClassList(courses, curricula);
                            break;
                        case 6:
                            // View Enrolled Subjects
                            Console.WriteLine("View Enrolled Subjects");
                            ViewEnrolledClasses(students);
                            break;
                        case 7:
                            // View account balances
                            Console.WriteLine("View account balances");
                            ViewPaymentInfo(students);
                            break;
                        case 8:
                            // Pay account balances
                            Console.WriteLine("Pay account balances");
                            PayBalances(students);
                            break;
                        case 9:
                            Console.WriteLine("Remove A Student from a course");
                            RemoveStudentFromACourse(students, courses);
                            break;
                        case '*':
                            Console.WriteLine("Show available courses");
                            ShowCourses(courses, curricula);
                            break;
                        case 10:
                            Console.WriteLine("Remove a student");
                            RemoveStudent(students);
                            break;
                        case 11:
                            Console.WriteLine("Admin's Menu");
                            AdminsMenu(students,courses,curricula);
                            break;
                        case '0':
                            // Quit
                            Console.Write("Thank you. Have a nice day.! :) ");
                            Console.ReadKey();
                            Environment.Exit(0);
                            break;
                        default:
                            Console.Write("Invalid key entered: {0} ", input);
                            break;
                    }
                    Console.ReadKey();
                }
                catch (Exception x)
                {
                    Console.WriteLine("Opps: {0}\n{1}", x.GetType(), x.Message);
                    Console.ReadKey();
                }

            } while (input != '0');
        }
        static void AdminsMenu(List<Student> students,List<Course> courses,List<Curriculum> curricula)
        {
            string username = "Admin";
            string password = "it111p";
            string user, pass;
            bool check = false;
            do
            {

                Console.WriteLine("Login");
                Console.Write("Username: ");
                user = Console.ReadLine();
                Console.Write("Password: ");
                pass = Console.ReadLine();

                if (user == username && pass == password)
                {
                    Console.WriteLine("You have been logged in.");
                    Console.ReadKey();
                    Console.Clear();
                    check = true;
                }
                else
                {
                    Console.WriteLine("Incorrect Username & Password.");
                    Console.ReadKey();
                    Console.Clear();
                }
            } while (user != username && pass != password);
            if(check==true)
            {
                int choice1;
                do
                {
                    Console.WriteLine("[1] Add Course");
                    Console.WriteLine("[2] Add Course to curriculum");
                    Console.WriteLine("[3] Exit");
                    Console.Write("Select A Choice: ");
                    choice1 = int.Parse(Console.ReadLine());
                    if (choice1 == 1)
                    {
                        string newCourseCode = " ";
                        string newCourseName = " ";
                        double courseCost = 0;
                        Console.Write("Add New Course Code: ");
                        newCourseCode = Console.ReadLine();
                        Console.Write("Add new Course Name: ");
                        newCourseName = Console.ReadLine();
                        Console.Write("Add new Course Cost: ");
                        courseCost = int.Parse(Console.ReadLine());
                        courses.Add(new Course() { CourseCode = newCourseCode, CourseName = newCourseName, CourseCost = courseCost, Students = new List<Student>() });
                        Console.WriteLine("Course Added!");
                        Console.Clear();
                    }
                    if (choice1 == 2)
                    {
                        for (int i = 0; i < curricula.Count; i++)
                        {
                            Console.WriteLine("[{0}] {1} ", i, curricula[i].CourseProgram);
                        }
                        Console.Write("Select A program: ");
                        int selectedProg = int.Parse(Console.ReadLine());
                        Console.Clear();
                        for (int j = 0; j < courses.Count; j++)
                        {
                            Console.WriteLine("[{0}] {1} - {2}", j, courses[j].CourseCode, courses[j].CourseName);
                        }
                        Console.Write("Select A course to be added in " + curricula[selectedProg].CourseProgram);
                        int selectedCourse = int.Parse(Console.ReadLine());
                        curricula[selectedProg].Courses.Add(courses[selectedCourse]);
                        Console.WriteLine("Course successfully added to the program!");
                        Console.ReadKey();
                        Console.Clear();
                    }
                } while (choice1!=3);
            }

        }
        static void RemoveStudentFromACourse(List<Student> students,List<Course> courses)
        {
            int enterStudID = EnterStudentID(students);
            int count = 0;
            int selectedCourse = 0;
            for (int i = 0; i < students.Count; i++)
            {
                if (students[i].StudentId == enterStudID)
                {
                    break;
                }
                count++;
            }
            Console.WriteLine("Available Courses: ");
            for (int i = 0; i < courses.Count; i++)
            {
                Console.WriteLine("[{0}] {1} - {2}", i, courses[i].CourseCode, courses[i].CourseName);
            }
            Console.Write("Select A course: ");
            selectedCourse = int.Parse(Console.ReadLine());
            courses[selectedCourse].Students.RemoveAt(count);
            Console.WriteLine("Student Successfully removed!");

        }
        static void RemoveStudent(List<Student>students)
        {

                Console.WriteLine("[1]Remove Student");
                int enterStudID = EnterStudentID(students);
                int count = 0;
                for (int i = 0; i < students.Count; i++)
                {
                    if (students[i].StudentId == enterStudID)
                    {
                        break;
                    }
                    count++;
                }
                students.RemoveAt(count);
            Console.WriteLine("Student Successfully Removed!");
        }
        static void EnterStudent(List<Student> s, List<Curriculum> ca, ref int c)
        {
            string inputName;
            int yrLvl, sNum, inProg;
            Console.Write("Enter name: ");
            inputName = Console.ReadLine();
            for (int i = 0; i < ca.Count; i++)
            {
                Console.Write("[{0}] {1} ", i, ca[i].CourseProgram);
            }
            Console.Write("\nEnter program: ");
            inProg = int.Parse(Console.ReadLine());
            Console.Write("Enter year level: ");
            yrLvl = int.Parse(Console.ReadLine());
            sNum = ((DateTime.Now.Year) * 1000) + (++c);
            s.Add(new Student() { Name = inputName, CourseProgram = ca[inProg].CourseProgram, CPNum = inProg, YearLevel = yrLvl, StudentId = sNum, Courses = new List<Course>(), Payment = new Payment() });
            Console.Write("Student added.");
        }
        static void ViewStudentInfo(List<Student> students)
        {
            FileStream file = new FileStream(@"studentlist.txt", FileMode.Create, FileAccess.Write);
            StreamWriter writer = new StreamWriter(file);

            Console.Clear();
            Console.WriteLine("List of Students: ");
            writer.WriteLine("List of Students: ");
            Console.WriteLine(("Name").PadRight(36) + "\t" + ("StudentNumber").PadRight(10) + "\t" + ("YearLevel").PadRight(10) + "\t" + ("CourseProgram").PadRight(8));
            writer.WriteLine(("Name").PadRight(36) + "\t" + ("StudentNumber").PadRight(10) + "\t" + ("YearLevel").PadRight(10) + "\t" + ("CourseProgram").PadRight(8));
            foreach (var stud in students)
            {
                Console.WriteLine("{0}\t{1}\t{2}\t{3}", stud.Name.PadRight(36), Convert.ToString(stud.StudentId).PadRight(10),
                    Convert.ToString(stud.YearLevel).PadRight(10), stud.CourseProgram.PadRight(8));
                writer.WriteLine("{0}\t{1}\t{2}\t{3}", stud.Name.PadRight(36), Convert.ToString(stud.StudentId).PadRight(10),
                    Convert.ToString(stud.YearLevel).PadRight(10), stud.CourseProgram.PadRight(8));
            }

            writer.Close();
            file.Close();
        }
        static void ShowCourses(List<Course> courses, List<Curriculum> curricula)
        {
            Console.WriteLine("Available Courses: ");
            for (int i = 0; i < courses.Count; i++)
                Console.WriteLine("[{0}] {1} - {2}", i, courses[i].CourseCode, courses[i].CourseName);
        }
        static void ViewCurriculum(List<Student> students, List<Curriculum> curricula, ref int sn, ref int co)
        {
            sn = EnterStudentID(students);
            if (sn == 0)
                return;

            co = 0;
            for (int i = 0; i < students.Count; i++)
            {
                if (students[i].StudentId == sn)
                {
                    break;
                }
                co++;
            }

            Console.WriteLine("Available Courses: ");
            for (int i = 0; i < curricula[students[co].CPNum].Courses.Count; i++)
                Console.WriteLine("[{0}] {1} - {2}", i, curricula[students[co].CPNum].Courses[i].CourseCode, curricula[students[co].CPNum].Courses[i].CourseName);
        }
        static void EnrollInCourse(List<Student> students, List<Course> courses, List<Curriculum> curricula, ref int sn, ref int co)
        {
            // int count = 0;
            // int enterStudID = EnterStudentID(students);
            // if (enterStudID == 0)
            //    return;

            ViewCurriculum(students, curricula, ref sn, ref co);
            if (sn == 0)
                return;

            // ShowCourses(courses, curricula);
            Console.Write("Enter course: ");
            int selectedCourse = int.Parse(Console.ReadLine());
            bool check1 = true;
            // count = 0;
            co = 0;
            for (int i = 0; i < curricula[students[co].CPNum].Courses[selectedCourse].Students.Count; i++)
            {
                if (sn == curricula[students[co].CPNum].Courses[selectedCourse].Students[i].StudentId)
                {
                    Console.WriteLine("Student is already enrolled in this course!");
                    check1 = false;
                    return;
                }
            }
            if (check1 == true)
            {
                for (int i = 0; i < students.Count; i++)
                {
                    if (students[i].StudentId == sn)
                    {
                        break;
                    }
                    co++;
                }
                students[co].Payment.TotalPayable += courses[selectedCourse].CourseCost;//Display cost
                students[co].Payment.Balance += courses[selectedCourse].CourseCost;//course cost

                curricula[students[co].CPNum].Courses[selectedCourse].Students.Add(students[co]); // <-- Fix this
                // students[co].Courses.Add(courses[selectedCourse]);                             // <-- Scrap this
                students[co].Courses.Add(curricula[students[co].CPNum].Courses[selectedCourse]);  // <-- Keep this
                // curricula[students[co].CPNum].Courses[selectedCourse]
                Console.WriteLine("Course added.!");
            }
        }
        static void ShowClassList(List<Course> courses, List<Curriculum> curricula)
        {
            FileStream file = new FileStream(@"classlist.txt", FileMode.Create, FileAccess.Write);
            StreamWriter writer = new StreamWriter(file);

            Console.Clear();
            ShowCourses(courses, curricula);
            Console.Write("Enter course: ");
            int selectedCourse = int.Parse(Console.ReadLine());
            Console.WriteLine("Class List");
            writer.WriteLine("Class List");
            Console.WriteLine("{0}: {1}", courses[selectedCourse].CourseCode, courses[selectedCourse].CourseName);
            writer.WriteLine("{0}: {1}", courses[selectedCourse].CourseCode, courses[selectedCourse].CourseName);
            Console.WriteLine(("Name").PadRight(36) + "\t" + ("StudentNumber").PadRight(10) + "\t" + ("YearLevel").PadRight(10) + "\t" + ("CourseProgram").PadRight(8));
            writer.WriteLine(("Name").PadRight(36) + "\t" + ("StudentNumber").PadRight(10) + "\t" + ("YearLevel").PadRight(10) + "\t" + ("CourseProgram").PadRight(8));
            int count = 1;
            foreach (var st in courses[selectedCourse].Students)
            {
                Console.WriteLine("[{4}]{0}\t{1}\t{2}\t{3}", st.Name.PadRight(36), Convert.ToString(st.StudentId).PadRight(10),
                    Convert.ToString(st.YearLevel).PadRight(10), st.CourseProgram.PadRight(8),count);
                writer.WriteLine("{0}\t{1}\t{2}\t{3}", st.Name.PadRight(36), Convert.ToString(st.StudentId).PadRight(10),
                    Convert.ToString(st.YearLevel).PadRight(10), st.CourseProgram.PadRight(8));
                count++;
            }
            writer.Close();
            file.Close();
        }
        static void ViewEnrolledClasses(List<Student> students)
        {
            int enterStudID = EnterStudentID(students);
            if (enterStudID == 0)
                return;

            int count = 0;
            for (int i = 0; i < students.Count; i++)
            {
                if (students[i].StudentId == enterStudID)
                {
                    break;
                }
                count++;
            }

            Console.WriteLine("Enrolled in: ");
            foreach (var s in students[count].Courses)
                Console.WriteLine("{0} - {1}", s.CourseCode, s.CourseName);

        }
        static void ViewPaymentInfo(List<Student> students)
        {
            FileStream file = new FileStream(@"ecm.txt", FileMode.Create, FileAccess.Write);
            StreamWriter writer = new StreamWriter(file);

            int enterStudID = EnterStudentID(students);
            if (enterStudID == 0)
                return;

            int count = 0;
            for (int i = 0; i < students.Count; i++)
            {
                if (students[i].StudentId == enterStudID)
                {
                    break;
                }
                count++;
            }

            writer.WriteLine("Certificate of Matriculation");
            writer.WriteLine("Name: {0} \t ID: {1} \t Program: {2} \t Year: {3}",
                students[count].Name, students[count].StudentId, students[count].CourseProgram, students[count].YearLevel);

            Console.WriteLine("Enrolled in: ");
            foreach (var s in students[count].Courses)
            {
                Console.WriteLine("{0} - {1} - {2}", s.CourseCode, s.CourseName, s.CourseCost);
                writer.WriteLine("{0} - {1} - {2}", s.CourseCode, s.CourseName, s.CourseCost);
            }
            Console.WriteLine("Total amount payable: {0}", students[count].Payment.TotalPayable);
            writer.WriteLine("Total amount payable: {0}", students[count].Payment.TotalPayable);
            Console.WriteLine("Total Amount Balance left: {0}", students[count].Payment.Balance);

            writer.Close();
            file.Close();
        }
        static void PayBalances(List<Student> students)
        {
            FileStream file = new FileStream(@"receipt.txt", FileMode.Create, FileAccess.Write);
            StreamWriter writer = new StreamWriter(file);

            double amount = 0, change = 0, topay = 0;
            int enterStudID = EnterStudentID(students);
            if (enterStudID == 0)
                return;
            int count = 0;

            writer.WriteLine("Official Receipt");

            for (int i = 0; i < students.Count; i++)
            {
                if (students[i].StudentId == enterStudID)
                {
                    break;
                }
                count++;
            }
            if (students[count].Payment.Balance <= 0)
            {
                Console.WriteLine("No balance left!");
                return;
            }
            else
            {
                topay = students[count].Payment.Balance;
                Console.WriteLine("To pay: {0}", topay);
                Console.Write("Enter Payment: ");
                amount = int.Parse(Console.ReadLine());
                writer.WriteLine("Name: {0} \t ID: {1} \t Program: {2} \t Year: {3}",
                    students[count].Name, students[count].StudentId, students[count].CourseProgram, students[count].YearLevel);
                change = amount - students[count].Payment.Balance;
                students[count].Payment.Balance -= amount;
                Console.WriteLine("Amount Paid: " + amount);
                Console.WriteLine("Change: " + change);
                writer.WriteLine("Amount Due: " + topay);
                writer.WriteLine("Amount Paid: " + amount);
                writer.WriteLine("Change: " + change);
                if (students[count].Payment.Balance <= 0)
                {
                    students[count].Payment.Balance = 0;
                    Console.WriteLine("Balance Left: {0}", students[count].Payment.Balance);
                }
                else
                {
                    Console.WriteLine("Balance Left: " + students[count].Payment.Balance);
                }
            }

            writer.Close();
            file.Close();
        }
        static int EnterStudentID(List<Student> students)
        {
            int enterStudID;
            string name = " ";
            int YearLevel = ' ';
            string CourseProgram = " ";
            int studID = ' ';
            char choice = ' ';
            bool check = false;

            do
            {
                Console.Write("Enter Student ID: ");
                enterStudID = int.Parse(Console.ReadLine());
                for (int i = 0; i < students.Count; i++)
                {
                    if (students[i].StudentId == enterStudID)
                    {
                        check = true;
                    }
                }
                if (check == false)
                {
                    Console.WriteLine("Student not found!");
                    Console.Write("Do you want to try again [Y/N]? ");
                    choice = char.Parse(Console.ReadLine());
                }
                if (check == true)
                {
                    break;
                }
            } while (choice != 'n');
            if (choice == 'n')
                return 0;
            if (check == true)
            {
                for (int i = 0; i < students.Count; i++)
                {
                    if (students[i].StudentId == enterStudID)
                    {
                        studID = enterStudID;
                        name = students[i].Name;
                        YearLevel = students[i].YearLevel;
                        CourseProgram = students[i].CourseProgram;
                        break;
                    }
                }
                Console.WriteLine("Student ID: " + studID);
                Console.WriteLine("Name: " + name);
                Console.WriteLine("Year level: " + YearLevel);
                Console.WriteLine("Course Program: " + CourseProgram);
            }
            return enterStudID;
        }
    }
    public class Student
    {
        public int StudentId { get; set; }
        public string Name { get; set; }
        public int YearLevel { get; set; }
        public string CourseProgram { get; set; }
        public int CPNum { get; set; }
        public List<Course> Courses { get; set; }
        public Payment Payment { get; set; }
    }
    public class Course
    {
        public string CourseCode { get; set; }
        public string CourseName { get; set; }
        public double CourseCost { get; set; }
        public List<Student> Students { get; set; }
    }
    public class Curriculum
    {
        public string CourseProgram { get; set; }
        public List<Course> Courses { get; set; }
    }
    public class Payment : Student
    {
        private double TotalAmountPayable { get; set; }
        private double BalanceLeft { get; set; }

        public double TotalPayable
        {
            get
            {
                return TotalAmountPayable;
            }
            set
            {
                TotalAmountPayable = value;
            }
        }
        public double Balance
        {
            get
            {
                return BalanceLeft;
            }
            set
            {
                BalanceLeft = value;
            }

        }
    }
}