module Servel

# File lib/servel.rb, line 15
def self.build_app(listings:, username: nil, password: nil)
  app = build_listings_app(build_path_map(listings))

  if username && username != ""
    build_authentication_app(app: app, username: username, password: password)
  else
    app
  end
end

# File lib/servel.rb, line 25
def self.build_authentication_app(app:, username:, password:)
  hashed_username = Digest::SHA512.digest(username)
  hashed_password = Digest::SHA512.digest(password)

  Rack::Auth::Basic.new(app) do |submitted_username, submitted_password|
    hashed_submitted_username = Digest::SHA512.digest(submitted_username)
    hashed_submitted_password = Digest::SHA512.digest(submitted_password)

    Rack::Utils.secure_compare(
      "#{hashed_username}#{hashed_password}",
      "#{hashed_submitted_username}#{hashed_submitted_password}"
    )
  end
end

# File lib/servel.rb, line 49
def self.build_listings_app(path_map)
  url_map = path_map.map { |root, url_root| [url_root, Servel::App.new(root)] }.to_h
  url_map["/"] = Servel::HomeApp.new(path_map.values) unless url_map.keys.include?("/")

  Rack::URLMap.new(url_map)
end

# File lib/servel.rb, line 40
def self.build_path_map(listings)
  listings.map do |listing|
    listing = { listing => nil } if listing.is_a?(String)

    root, url_root = listing.keys.first, listing.values.first || "/"
    [Pathname.new(root).realpath, url_root]
  end.to_h
end