module GistNuke

# File lib/gist_nuke.rb, line 102
def construct_hydra(range)
  t = token_from_file
  @batch = Typhoeus::Hydra.new
  range.map { |gist_id| @batch.queue(Typhoeus::Request.new("#{BASE_URL}gists/#{gist_id}?access_token=#{t}",
                                                         method: :delete))}
end

# File lib/gist_nuke.rb, line 93
def delete_range(numbers = [])
  numbers = numbers.map { |num| num.to_i }
  range = (numbers[0]..numbers[-1])
  list = gather_pages(range)
  list[range]
  construct_hydra(list[range])
  @batch.run
end

# File lib/gist_nuke.rb, line 79
def gather_pages(range)
  keys = []
  page_number = 1
  last_page = false

  until keys.length >= range.last || last_page
    to_append = just_keys(load_gists(page_number))
    last_page = to_append.empty?
    keys += to_append
    page_number += 1
  end
  keys
end

# File lib/gist_nuke.rb, line 29
def get_github_token(credentials = {})
  uri = URI(BASE_URL + AUTH_EXT)
  req = Net::HTTP::Post.new(uri.path)
  req.content_type = "application/json"
  req.body = JSON.dump({
    scopes: [:gist],
    note: "Batch delete your gists, you know you want to."
  })

  req.basic_auth(credentials[:username], credentials[:password])

  res = Net::HTTP.start(uri.hostname, uri.port,
                       :use_ssl => uri.scheme == 'https') do |http|
    http.request(req)
  end

  JSON.parse(res.body)['token']
end

# File lib/gist_nuke.rb, line 75
def just_keys(gists = [])
  gists.map { |g| g['id'] }
end

# File lib/gist_nuke.rb, line 62
def load_gists(page_number = 1)
  token = token_from_file
  uri = URI("#{BASE_URL}gists?access_token=#{token}&page=#{page_number}")
  Net::HTTP.start(uri.host, uri.port,
                  :use_ssl => uri.scheme == 'https') do |http|
    request = Net::HTTP::Get.new uri.request_uri

    response = http.request(request)

    JSON.parse(response.body)
  end
end

# File lib/gist_nuke.rb, line 12
def login
  credentials = {}
  puts "Let's get an Oauth Token from GitHub"
  print "Enter your username: "
  credentials[:username] = $stdin.gets.chomp
  print "Enter your password: "
  credentials[:password] = begin `stty -echo` rescue nil
               $stdin.gets.chomp
             ensure
               `stty echo` rescue nil
             end

  puts ""
  token = get_github_token(credentials)
  save_auth_token(token)
end

# File lib/gist_nuke.rb, line 56
def save_auth_token(token)
  File.open(".gist_nuke", "w+") do |file|
    file.write(token)
  end
end

# File lib/gist_nuke.rb, line 48
def token_from_file
  if File.exists?('.gist_nuke')
    File.read('.gist_nuke')
  else
    false
  end
end