require 'sinatra'
require 'bcrypt'

def hash_password(password)
  BCrypt::Password.create(password).to_s
end

def verify_password(password, hash)
  BCrypt::Password.new(hash) == password
end

User = Struct.new(:id, :email, :password_hash)
USERS = [
  User.new(1, 'P1', hash_password('P1')),
  User.new(2, 'P2', hash_password('P2')),
  User.new(3, 'P3', hash_password('P3')),
]

enable :sessions

get '/' do
  if current_user
    erb :home
  else
    redirect '/login'
  end
end

get '/login' do
  erb :login
end

post '/login' do
  puts params
  user = USERS.find { |u| u.email == params[:email] }
  if user && verify_password(params[:password], user.password_hash)
    session.clear
    session[:user_id] = user.id
    redirect '/'
  else
    @error = 'Username or password was incorrect'
    erb :login
  end
end

post '/logout' do
  session.clear
  redirect '/login'
end

helpers do
  def current_user
    if session[:user_id]
       USERS.find { |u| u.id == session[:user_id] }
    else
      nil
    end
  end
end