app.rb

require 'json'
require_relative 'student'
require_relative 'teacher'
require_relative 'book'
require_relative 'rental'
require_relative 'classroom'

class App
  def initialize
    create_data
    create_file_if_not_exists('./data/people.json')
    create_file_if_not_exists('./data/books.json')
    create_file_if_not_exists('./data/rentals.json')
    load_data_from_files
  end

  def create_data
    return if Dir.exist?('./data')

    Dir.mkdir('./data')
  end

  def load_data_from_files
    @people = load_json_file('./data/people.json', [])
    @books = load_json_file('./data/books.json', [])
    @rentals = load_json_file('./data/rentals.json', [])
  end

  def load_json_file(file_path, default_value)
    file = File.open(file_path)
    file_data = file.read
    if file_data.empty?
      default_value
    else
      JSON.parse(file_data)
    end
  end

  def create_file_if_not_exists(file_path)
    return if File.exist?(file_path)

    File.open(file_path, 'w')
  end

  def list_books
    @books.each do |book|
      puts "Title: '#{book['title']}', Author: #{book['author']}"
    end
  end

  def list_people
    @people.each do |person|
      if person['role'] == '[Teacher]'
        puts "#{person['role']} ID: #{person['id']}, Name: #{person['name']}, Age: #{person['age']},
        Specialization: #{person['specialization']}"
      else
        puts "#{person['role']} ID: #{person['id']}, Name: #{person['name']}, Age: #{person['age']},
        Classroom: #{person['classroom']}, Parent Permission: #{person['permission']}"
      end
    end
  end

  def list_rentals_for_person(person_id)
    filtered_rentals = @rentals.select { |obj| obj['id'] == person_id }
    if filtered_rentals.length.positive?
      filtered_rentals.each do |rental|
        puts "Date: #{rental['date']}, Book: '#{rental['title']}' by #{rental['author']}"
      end
    else
      puts 'No matching ID'
    end
  end

  def create_student(age, classroom, name, permission)
    classroom_name = Classroom.new(classroom)
    student = Student.new(age, classroom_name, name, parent_permission: permission)
    student_input = {
      'role' => '[Student]',
      'id' => student.id,
      'name' => student.name,
      'age' => student.age,
      'classroom' => classroom_name.label,
      'permission' => student.parent_permission
    }
    @people << student_input
    File.write('./data/people.json', JSON.pretty_generate(@people))
  end

  def create_teacher(age, specialization, name)
    teacher = Teacher.new(age, specialization, name)
    teacher_input = {
      'role' => '[Teacher]',
      'id' => teacher.id,
      'name' => teacher.name,
      'age' => teacher.age,
      'specialization' => teacher.specialization
    }
    @people << teacher_input
    File.write('./data/people.json', JSON.pretty_generate(@people))
  end

  def create_book(title, author)
    book = Book.new(title, author)
    book_input = {
      'title' => book.title,
      'author' => book.author
    }
    @books << book_input
    File.write('./data/books.json', JSON.pretty_generate(@books))
  end

  def list_books_with_index
    puts 'Select a book from the following list by number:'
    @books.each_with_index do |book, index|
      puts "#{index}) Title: '#{book['title']}', Author: #{book['author']}"
    end
  end

  def list_people_with_index
    puts 'Select a person from the following list by number (not id):'
    @people.each_with_index do |person, index|
      if person['role'] == '[Teacher]'
        puts "#{index}) #{person['role']} ID: #{person['id']}, Name: #{person['name']}, Age: #{person['age']},
        Specialization: #{person['specialization']}"
      else
        puts "#{index}) #{person['role']} ID: #{person['id']}, Name: #{person['name']}, Age: #{person['age']},
        Classroom: #{person['classroom']}, Parent Permission: #{person['permission']}"
      end
    end
  end

  def create_rental(date, person_index, book_index)
    person = @people[person_index]
    book = @books[book_index]
    rental = Rental.new(date, person, book)
    rental_input = {
      'id' => rental.person['id'],
      'title' => rental.book['title'],
      'author' => rental.book['author'],
      'date' => rental.date
    }
    @rentals << rental_input
    File.write('./data/rentals.json', JSON.pretty_generate(@rentals))
  end
end