gem 'wrapper_based'

class ApplicationController
  include DCI::Roles(:current_user, logged: SignsUser)

  before_action -> { with! logged: session }
  helper_method :logged, :current_user
  
  private

  def authenticate_user!
    if logged.out?
      flash[:error] = "You must be logged in to access this section"
      redirect_to login_url
    else
      with_current_user! logged.user
    end
  end
end

class LoginController < ApplicationController
  include DCI::Roles(signing: SignsUser, user_params: UserParams, login: HasEncryptedPassword)

  before_action -> { with! signing: session, user_params: params.require(:user) }
  before_action -> { with! login: signing.by(user_params.login) }

  def new; end

  def create
    if login.authenticate(user_params.password)
      signing.in! login
      redirect_to login, notice: 'Welcome, you are now logged in.'
    else
      flash[:danger] = 'Invalid credentials.'
      render :new, status: :unauthorized
    end
  end
end

class LogoutController < ApplicationController
  include DCI::Roles(signing: SignsUser)

  before_action -> { with! signing: session }

  def destroy
    signing.out!
    redirect_to root_url
  end
end

class SignsUser < Struct.new(:signed)
  def in!(user)
    signed[:user_id] = user.id
  end

  def out!
    signed.delete(:user_id)
    @user = nil
  end

  def out?
    signed[:user_id].nil? || in?
  end

  def in?
    !user.nil?
  end

  def user
    @user ||= by(id: signed[:user_id])
  end

  def by(**identification)
    User.find_by identification
  end

  def with(**credentials)
    User.new credentials
  end

  def up!(user)
    user.save && user if User.validate_registering(user)
  end
end

module UserParams
  def registration
    permit(:username, :email)
  end

  def login
    permit(:username, :email)
  end

  def security
    permit(:password, :password_confirmation, :code)
  end

  def password
    self[:password]
  end
end

class GiftToy < DCI::Context(:toy, gifter: Buyer, giftee: Recipient)
  def call(toy = @toy)
    gift = gifter.buy 
    giftee.receive gift 
  end
end

['Card Wars', 'Ice Ninja Manual', 'Bacon'].map &GiftToy[gifter: 'Jake', giftee: 'Finn']

Funds::TransferMoney.(from: @account1, to: @account2, amount: 50)

Funds::TransferMoney.new(from: @account1, to: @account2, amount: 50).call