hospital_tony.rb

class Hospital
  attr_accessor :name, :address, :employees, :patients

  def initialize(args)
    @name = args[:name]
    @address = args[:address]
    @employees = args[:employees] || []
    @patients = args[:patients] || []
  end

  def print_all_patients
    @patients.each { |patient| print_patient(patient) }
  end

  def print_patient(patient)
    puts "Name: #{patient.name}"
    puts "Age: #{patient.age}"
    puts "Gender: #{patient.gender}"
    puts "Blood Type: #{patient.blood_type}"
    puts "Is Sick? #{patient.is_sick}"
    puts ""
  end

  def admit_patient(patient)
    patient.is_sick = true
    @patients << patient
  end

  def discharge_patient(patient)
    patient.is_sick = false
    @patients.delete(patient)
  end

  def print_all_employees
    @employees.each { |employee| print_employee(employee) }
  end

  def print_employee(employee)
    puts "Name: #{employee.name}"
    puts "Age: #{employee.age}"
    puts "Gender: #{employee.gender}"
    puts "Job: #{employee.job}"
    puts ""
  end

  def add_employee(employee)
    @employees << employee
  end

  def remove_employee(employee)
    @employees.delete(employee)
  end

  def to_s
    "#{@name}"
  end
end

class Person
  attr_accessor :name, :age, :gender, :username, :password
  
  def initialize(args)
    @name = args[:name]
    @age = args[:age]
    @gender = args[:gender]
    @username = args[:username] || args[:name].downcase
    @password = args[:password] || '1234'
  end

  def to_s
    "#{@name}"
  end
end

class Patient < Person
  attr_accessor :is_sick
  attr_reader :blood_type

  def initialize(args)
    @is_sick = false
    @blood_type = args[:blood_type]
    super(args)
  end
end

class Employee < Person
  attr_accessor :job

  def initialize(args)
    @job = args[:job]
    super(args)
  end

end

class HostpitalRecordManagement
  attr_accessor :hospital

  def initialize(hospital)
    @hospital = hospital
  end

  def authenticate
    puts "Welcome to #{@hospital.name}"
    puts "----------------------------------------------------"

    access = nil
    while access == nil
      puts "Please enter your username:"
      username = gets.chomp
      puts "Please enter your password:"
      password = gets.chomp
      puts "----------------------------------------------------"
      person = retrieve_person(username)
      access = password_access_level(person, password)
      puts "Cannot find username/password combination. Please try again." if access == nil
    end

    puts "Welcome, #{person.name}.  Your access level is: #{access}"
    puts "----------------------------------------------------"
    activate_options(person, access)
  end

  def activate_options(person, access)
    puts "What would you like to do?"
    puts "Enter a command. Options:"
    
    input = ""
    until input == "exit"
      puts ""
      case access
      when "ADMINISTRATOR"
        puts "view self record"
        puts "view patients"
        puts "add patient"
        puts "remove patient"
        puts "view employees"
        puts "add employee"
        puts "remove employee"
        puts "exit"
        puts ""
        input = gets.chomp
        puts ""

        case input
        when "view self record"
          view_self_employee_record(person)
        when "view patients"
          view_patient_records
        when "add patient"
          add_patient_to_records
        when "remove patient"
          remove_patient_from_records
        when "view employees"
          view_employee_records
        when "add employee"
          add_employee_to_records
        when "remove employee"
          remove_employee_from_records
        when "exit"
          puts "Thank you. Good day!"
        else
          puts "Cannot understand command. Please try agian:"
        end
          
      when "DOCTOR"
        puts "view self record"
        puts "view patients"
        puts "exit"
        input = gets.chomp
        puts ""

        case input
        when "view self record"
          view_self_employee_record(person)
        when "view patients"
          view_patient_records
        when "exit"
          puts "Thank you. Good day!"
        else
          puts "Cannot understand command. Please try agian:"
        end

      when "RECEPTIONIST"
        puts "view self record"
        puts "view patient records"
        puts "view employee records"
        puts "exit"
        input = gets.chomp
        puts ""

        case input
        when "view self record"
          view_self_employee_record(person)
        when "view patients"
          view_patient_records
        when "view employees"
          view_employee_records
        when "exit"
          puts "Thank you. Good day!"
        else
          puts "Cannot understand command. Please try agian:"
        end

      when "JANITOR"
        puts "view self record"
        puts "exit"
        input = gets.chomp
        puts ""

        case input
        when "view self record"
          view_self_employee_record(person)
        when "exit"
          puts "Thank you. Good day!"
        else
          puts "Cannot understand command. Please try agian:"
        end

      when "PATIENT"
        puts "view self record"
        puts "exit"
        input = gets.chomp
        puts ""

        case input
        when "view self record"
          view_self_patient_record(person)
        when "exit"
          puts "Thank you. Good day!"
        else
          puts "Cannot understand command. Please try agian:"
        end

      end
    end
  end

  def view_self_patient_record(person)
    @hospital.print_patient(person)
  end

  def view_patient_records
    @hospital.print_all_patients
  end

  def add_patient_to_records
    puts "Enter patient's name:"
    name = gets.chomp
    puts "Enter patient's age:"
    age = gets.chomp
    puts "Enter patient's gender:"
    gender = gets.chomp
    puts "Enter patient's blood type:"
    blood_type = gets.chomp
    @hospital.admit_patient(Patient.new( {name: name, age: age, gender: gender, blood_type: blood_type } ))
    puts "#{name} has been added to 'PATIENT RECORDS'."
  end

  def remove_patient_from_records
    puts "Enter patient's username:"
    username = gets.chomp
    patient = retrieve_patient(username)
    if patient
      @hospital.discharge_patient(patient)
      puts "#{username} has been discharged."
    else
      puts "Cannot find patient's username."
    end
  end

  def view_self_employee_record(person)
    @hospital.print_employee(person)
  end

  def view_employee_records
    @hospital.print_all_employees
  end

  def add_employee_to_records
    puts "Enter employee's name:"
    name = gets.chomp
    puts "Enter employee's age:"
    age = gets.chomp
    puts "Enter employee's gender:"
    gender = gets.chomp
    puts "Enter employee's job position:"
    job = gets.chomp
    @hospital.add_employee(Employee.new( {name: name, age: age, gender: gender, job: job } ))
    puts "#{name} has been added to 'EMPLOYEE RECORDS'."
  end
  
  def remove_employee_from_records
    puts "Enter employee's username:"
    username = gets.chomp
    employee = retrieve_employee(username)
    if employee
      @hospital.remove_employee(employee)
      puts "#{username} has been removed."
    else
      puts "Cannot find employee's username."
    end
  end

  def retrieve_patient(username)
    @hospital.patients.each { |patient| return patient if patient.username.downcase == username.downcase }
    nil
  end

  def retrieve_employee(username)
    @hospital.employees.each { |employee| return employee if employee.username.downcase == username.downcase }
    nil
  end

  def retrieve_person(username)
    all_people = @hospital.employees | @hospital.patients
    all_people.each { |person| return person if person.username.downcase == username.downcase }
    nil
  end

  def password_access_level(person, password)
    return nil if person == nil
    if person.password == password
      return "PATIENT" if person.is_a? Patient
      return person.job.upcase if person.is_a? Employee
    end
    nil
  end
end


# DRIVER CODE

admin = Employee.new( { name: "Administrator", age: "35", gender: "male", job: "administrator", username: "admin" } )
tim = Employee.new( { name: "Timothy", age: "27", gender: "male", job: "doctor", username: "tim" } )
ling = Employee.new( { name: "Ling", age: "25", gender: "female", job: "doctor", username: "ling" } )
kevin = Employee.new( { name: "Kevin", age: "22", gender: "male", job: "receptionist", username: "kevin" } )
tony = Employee.new( { name: "Tony", age: "25", gender: "male", job: "janitor", username: "tony" } )
mikhail = Patient.new( { name: "Mikhail", age: "28", gender: "male", blood_type: "O", username: "mikhail" } )
marko = Patient.new( { name: "Marko", age: "29", gender: "male", blood_type: "AB", username: "marko" } )
erin = Patient.new( { name: "Erin", age: "27", gender: "female", blood_type: "B", username: "erin" } )

maimonides = Hospital.new( {name: "Maimonides Medical Center", address: "4802 10th Ave, Brooklyn, NY 11219", employees: [admin, tim, ling, kevin, tony], patients: [mikhail, marko, erin] } )

software = HostpitalRecordManagement.new(maimonides)
software.authenticate