sessions_controller.rb

class SessionsController < ApplicationController
  def login_form
  end

  def login
   username = params[:username]
   if username and user = User.find_by(username: username)
     session[:user_id] = user.id
     flash[:status] = :success
     flash[:result_text] = "Successfully logged in as existing user #{user.username}"
   else
     user = User.new(username: username)
     if user.save
       session[:user_id] = user.id
       flash[:status] = :success
       flash[:result_text] = "Successfully created new user #{user.username} with ID #{user.id}"
     else
       flash.now[:status] = :failure
       flash.now[:result_text] = "Could not log in"
       flash.now[:messages] = user.errors.messages
       render "login_form", status: :bad_request
       return
     end
   end
   redirect_to root_path
 end


  def create
    auth_hash = request.env['omniauth.auth']

    if auth_hash['uid']
      @user = User.find_by(uid: auth_hash[:uid], provider: 'github')
      if @user.nil?
        @user = User.new(
        name: auth_hash['info']['name'],
        email: auth_hash['info']['email'],
        uid: auth_hash['uid'],
        provider: auth_hash['provider'])

        if @user.save
          session[:user_id] = @user.id
          flash[:status] = :success
          flash[:result_text] = "Successfully logged in"
          redirect_to root_path
        else
          flash[:status] = :failure
          flash[:result_text] = "Could not log in"
        end
      else
        session[:user_id] = @user.id
        flash[:success] = "Logged in successfully"
        redirect_to root_path
      end
    else
      flash[:error] = "Could not log in"
      redirect_to root_path
    end
  end



  def logout
    session[:user_id] = nil
    flash[:status] = :success
    flash[:result_text] = "Successfully logged out"
    redirect_to root_path
  end
end