class UsersController < ApplicationController
  before_action :set_user, only: [:show, :edit, :update, :destroy]

  def index
    @users = User.all
  end

  def create
    @user = User.new(user_params)

    if @user.save
      redirect_to @user, notice: 'User created successfully'
    else
      render :new, status: :unprocessable_entity
    end
  end

  private

  def set_user
    @user = User.find(params[:id])
  end

  def user_params
    params.require(:user).permit(:name, :email)
  end
end

class User < ApplicationRecord
  has_many :posts, dependent: :destroy

  validates :email, presence: true, uniqueness: true
  validates :name, presence: true, length: { minimum: 2 }

  scope :active, -> { where(active: true) }

  def full_name
    "#{first_name} #{last_name}"
  end
end

class UserRegistrationService
  def initialize(user_params)
    @user_params = user_params
  end

  def call
    User.transaction do
      user = User.create!(@user_params)
      send_welcome_email(user)
      user
    end
  rescue ActiveRecord::RecordInvalid => e
    OpenStruct.new(success?: false, error: e.message)
  end

  private

  def send_welcome_email(user)
    UserMailer.welcome(user).deliver_later
  end
end