#!/usr/bin/env node
import inquirer from "inquirer";

class Student {
  static studentCount: number = 0;

  studentID: string;
  name: string;
  courses: string[];
  balance: number;

  constructor(name: string) {
    this.studentID = this.generateStudentID();
    this.name = name;
    this.courses = [];
    this.balance = 0;
    Student.studentCount++;
  }

  private generateStudentID(): string {
    return Math.floor(10000 + Math.random() * 90000).toString();
  }

  enrollCourse(course: string): void {
    this.courses.push(course);
    console.log(`${this.name} enrolled in ${course} successfully.`);
  }

  viewBalance(): void {
    console.log(`${this.name}'s balance: $${this.balance}`);
  }

  payTuition(amount: number): void {
    this.balance += amount;
    console.log(
      `${this.name} paid $${amount}. Remaining balance: $${this.balance}`
    );
  }

  showStatus(): void {
    console.log(`Student Name: ${this.name}`);
    console.log(`Student ID: ${this.studentID}`);
    console.log(`Courses Enrolled: ${this.courses.join(", ")}`);
    console.log(`Balance: $${this.balance}`);
  }
}

class StudentManagementSystem {
  students: Student[];

  constructor() {
    this.students = [];
  }

  async addStudent(): Promise<void> {
    const { name } = await inquirer.prompt([
      { name: "name", message: "Enter student name:" },
    ]);
    const newStudent = new Student(name);
    this.students.push(newStudent);
    console.log(
      `${newStudent.name} added to the system with ID ${newStudent.studentID}`
    );
  }

  async enrollStudentInCourse(): Promise<void> {
    const { studentID, course } = await inquirer.prompt([
      { name: "studentID", message: "Enter student ID:" },
      { name: "course", message: "Enter course name:" },
    ]);

    const student = this.findStudentByID(studentID);
    if (student) {
      student.enrollCourse(course);
    } else {
      console.log("Student not found.");
    }
  }

  async viewStudentBalance(): Promise<void> {
    const { studentID } = await inquirer.prompt([
      { name: "studentID", message: "Enter student ID:" },
    ]);
    const student = this.findStudentByID(studentID);
    if (student) {
      student.viewBalance();
    } else {
      console.log("Student not found.");
    }
  }

  async payStudentTuition(): Promise<void> {
    const { studentID, amount } = await inquirer.prompt([
      { name: "studentID", message: "Enter student ID:" },
      { name: "amount", message: "Enter tuition amount to pay:" },
    ]);

    const student = this.findStudentByID(studentID);
    if (student) {
      student.payTuition(Number(amount));
    } else {
      console.log("Student not found.");
    }
  }

  async showStudentStatus(): Promise<void> {
    const { studentID } = await inquirer.prompt([
      { name: "studentID", message: "Enter student ID:" },
    ]);
    const student = this.findStudentByID(studentID);
    if (student) {
      student.showStatus();
    } else {
      console.log("Student not found.");
    }
  }

  private findStudentByID(studentID: string): Student | undefined {
    return this.students.find((student) => student.studentID === studentID);
  }
}

async function main() {
  const sms = new StudentManagementSystem();

  while (true) {
    const { action } = await inquirer.prompt([
      {
        name: "action",
        message: "Select an action:",
        type: "list",
        choices: [
          "Add Student",
          "Enroll Student in Course",
          "View Student Balance",
          "Pay Student Tuition",
          "Show Student Status",
          "Exit",
        ],
      },
    ]);

    switch (action) {
      case "Add Student":
        await sms.addStudent();
        break;

      case "Enroll Student in Course":
        await sms.enrollStudentInCourse();
        break;

      case "View Student Balance":
        await sms.viewStudentBalance();
        break;

      case "Pay Student Tuition":
        await sms.payStudentTuition();
        break;

      case "Show Student Status":
        await sms.showStudentStatus();
        break;

      case "Exit":
        console.log("Exiting Student Management System.");
        process.exit(0);
    }
  }
}

main();