app.rb

require("bundler/setup")
  Bundler.require(:default)
  also_reload("lib/**/*.rb")

  Dir[File.dirname(__FILE__) + '/lib/*.rb'].each { |file| require file } #loading individual files when required

  enable :sessions

  #sessions
  post "/current_users" do
    @name = params["name"]
    @email = params["email"]
    if Authentication.exists?(authentications: {username: @name, Email: @email})
      session[:message] = "Welcome #{@name}"
      redirect "/index?name=#{@name}"
    else
      erb(:no_user)
    end
  end

  #loads first web page 'index'
  get("/") do
    erb(:start)
  end

  get("/index") do
    @message = session[:message]
    erb(:index)
  end

  get("/login") do
    erb(:login)
  end

  get("/logout") do
    @message = session.delete(:message)
    @name = params["name"]
    @email = params["email"]
    redirect("/")
  end

  get("/event") do
    @hosts = Host.all()
  	@events = Event.all()
  	erb(:events)
  end

  get("/user") do
    @users = User.all()
    erb(:users)
  end
  

  get("/host") do
    @hosts = Host.all()
    erb(:hosts)
  end

  get("/ticket_form") do
    erb(:ticket_form)
  end

  get("/events") do
    @hosts = Host.all()
  	@events = Event.all()
  	erb(:events)
  end

  get("/hosts") do
    @hosts = Host.all()
    erb(:hosts)
  end

  get("/users") do
    @users = User.all()
    erb(:users)
  end

  get("/current_users") do
    erb(:current_users)
  end

  get('/users/:id') do
    @events = Event.all()
    @user = User.find(params.fetch("id").to_i())
    erb(:user_details)
  end

  get('/hosts/:id') do
    @events = Event.all()
    @host = Host.find(params.fetch("id").to_i())
    erb(:host_details)
  end

  get('/events/:id') do
    @users = User.all()
    @event = Event.find(params.fetch("id").to_i())
    erb(:events_details)
  end

  post("/sign_ups") do
    username = params.fetch(:username)
    Email = params.fetch(:Email)
    auth = Authentication.new({:username => username,:Email => Email,:id => nil})
    if Authentication.exists?(username: auth.username)
      erb(:errors)
    elsif Authentication.exists?(Email: auth.Email)
      erb(:errors)
    else
      auth.save()
      redirect("/current_users")
    end
  end

  post("/events") do
    name = params.fetch("name")
    description = params.fetch("description")
    number_of_tickets = params.fetch("number_of_tickets")
    description = params.fetch("description")
    host_id = params.fetch("host_id").to_i()
    @host = Host.find(host_id)
    event = Event.new({:host_id => host_id,:name => name, :description => description, :number_of_tickets => number_of_tickets, :id => nil})
    if event.save()
      redirect("/events")
    else
      erb(:errors)
    end
  end

  post("/hosts") do
    name = params.fetch(:name)
    Telephone = params.fetch(:Telephone)
    Email = params.fetch(:Email)
    host = Host.new({:name => name, :Telephone => Telephone, :Email => Email, :id => nil})
    if host.save()
      redirect("/hosts")
    else
      erb(:errors)
    end
  end

  post("/tickets") do
    name = params.fetch(:name)
    Telephone = params.fetch(:Telephone)
    Email = params.fetch(:Email)
    ticket = params.fetch(:tickets)
    redirect  "https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl=" + (name + " - " + " Telephone "+ Telephone + " - " + " Tickets " +ticket)
  end

  post("/users") do
    name = params.fetch(:name)
    Telephone = params.fetch(:Telephone)
    Email = params.fetch(:Email)
    user = User.new({:name => name, :Telephone => Telephone, :Email => Email, :id => nil})
    if user.save()
      redirect("/users")
    else
      erb(:errors)
    end
  end

  patch("/users/:id") do
    user_id = params.fetch("id").to_i()
    @user = User.find(user_id)
    event_ids = params.fetch("event_ids")
    @user.update({:event_ids => event_ids})
    @events = Event.all()
    redirect("/users")
  end

  delete("/events/:id") do
    @event = Event.find(params.fetch("id").to_i())
    if @event.destroy()
      redirect("/host")
    else
      erb(:errors)
    end
  end

  get("/events/:id/edit") do
    @event = Event.find(params.fetch("id").to_i())
    erb(:delete_event)
  end