package services;

import models.*;
import java.util.ArrayList;
import java.util.List;

public class SchoolSystem {
    private List<Student> students;
    private List<Teacher> teachers;
    private List<Course> allCourses;

    public SchoolSystem() {
        this.students = new ArrayList<>();
        this.teachers = new ArrayList<>();
        this.allCourses = new ArrayList<>();
    }

    // ========== Student Management ==========
    //TODO

    // ========== Teacher Management ==========
    public boolean registerTeacher(String username, String password) {
        if (findTeacher(username) != null) {
            return false;
        }
        teachers.add(new Teacher(username, password));
        return true;
    }

    public Teacher loginTeacher(String username, String password) {
        Teacher teacher = findTeacher(username);
        if (teacher != null && teacher.checkPassword(password)) {
            return teacher;
        }
        return null;
    }

    private Teacher findTeacher(String username) {
        for (Teacher t : teachers) {
            if (t.getUsername().equals(username)) return t;
        }
        return null;
    }

    // ========== Course Management ==========
    public boolean addCourseToSystem(String courseName) {
       //TODO
        return true;
    }

    public Course findCourseById(int id) {
       //TODO
        return null;
    }

    public Course findCourseByName(String name) {
        for (Course c : allCourses) {
            if (c.getName().equalsIgnoreCase(name)) return c;
        }
        return null;
    }

    public void showAllCourses() {
        if (allCourses.isEmpty()) {
            System.out.println(" No courses available yet.");
        } else {
            System.out.println("\n All Available Courses:");
            for (int i = 0; i < allCourses.size(); i++) {
                System.out.println("  " + (i+1) + ". " + allCourses.get(i));
            }
        }
    }

    public List<Course> getAllCourses() {
        return allCourses;
    }
}