app.rb

require 'sinatra'
require 'shotgun'
require 'pry'
require 'csv'

def read_beers_from(filename)
  beers = []

  CSV.foreach(filename, headers: true) do |row|
    beers << {
      name: row['name'],
      description: row['description']
    }
  end

  beers
end

def save_beer(filename, name, description)
  CSV.open(filename, 'a') do |csv|
    csv << [name, description]
  end
end

get '/beers' do
  @beers = read_beers_from('beers.csv')
  erb :'beers/index'
end

get '/beers/new' do
  erb :'beers/new'
end

post '/beers' do
  # params looks like this:
  # {"beer"=>{"name"=>"Pumpkinhead", "description"=>"Delicious!"}}

  # take the beer params from params hash
  @name = params[:beer][:name]
  @description = params[:beer][:description]

  if !params[:beer][:name].empty? && !params[:beer][:description].empty? && params[:beer][:description].length >= 4
    # add the beer to the CSV
    save_beer('beers.csv', @name, @description)

    # redirect the user to the index page
    redirect '/beers'
  else
    @error_messages = []
    @error_messages << "You must enter a name." if params[:beer][:name].empty?
    @error_messages << "You must enter a description." if params[:beer][:description].empty?
    @error_messages << "Description must be 4 characters or longer." if params[:beer][:description].length < 4
    # if params[:beer][:name].empty?
    #   @error_messages << "You must enter a name."
    # end

    erb :'beers/new'
  end
end