require 'rails_helper'
require 'user_name_suggester'

describe UserNameSuggester do

  describe 'name heuristics' do
    it 'is able to guess a decent username from an email' do
      expect(UserNameSuggester.suggest('bob@bob.com')).to eq('bob')
    end
  end

  describe '.suggest' do
    before do
      User.stubs(:username_length).returns(3..15)
    end

    it "doesn't raise an error on nil username" do
      expect(UserNameSuggester.suggest(nil)).to eq(nil)
    end

    it 'corrects weird characters' do
      expect(UserNameSuggester.suggest("Darth%^Vader")).to eq('Darth_Vader')
    end

    it "transliterates some characters" do
      expect(UserNameSuggester.suggest("Jørn")).to eq('Jorn')
    end

    it 'adds 1 to an existing username' do
      user = Fabricate(:user)
      expect(UserNameSuggester.suggest(user.username)).to eq("#{user.username}1")
    end

    it "adds numbers if it's too short" do
      expect(UserNameSuggester.suggest('a')).to eq('a11')
    end

    it "has a special case for me and i emails" do
      expect(UserNameSuggester.suggest('me@eviltrout.com')).to eq('eviltrout')
      expect(UserNameSuggester.suggest('i@eviltrout.com')).to eq('eviltrout')
    end

    it "shortens very long suggestions" do
      expect(UserNameSuggester.suggest("myreallylongnameisrobinwardesquire")).to eq('myreallylongnam')
    end

    it "makes room for the digit added if the username is too long" do
      User.create(username: 'myreallylongnam', email: 'fake@discourse.org')
      expect(UserNameSuggester.suggest("myreallylongnam")).to eq('myreallylongna1')
    end

    it "doesn't suggest reserved usernames" do
      SiteSetting.reserved_usernames = 'myadmin|steve|steve1'
      expect(UserNameSuggester.suggest("myadmin@hissite.com")).to eq('myadmin1')
      expect(UserNameSuggester.suggest("steve")).to eq('steve2')
    end

    it "doesn't suggest generic usernames" do
      UserNameSuggester::GENERIC_NAMES.each do |name|
        expect(UserNameSuggester.suggest("#{name}@apple.org")).to eq('apple')
      end
    end

    it "removes leading character if it is not alphanumeric" do
      expect(UserNameSuggester.suggest(".myname")).to eq('myname')
    end

    it "allows leading _" do
      expect(UserNameSuggester.suggest("_myname")).to eq('_myname')
    end

    it "removes trailing characters if they are invalid" do
      expect(UserNameSuggester.suggest("myname!^$=")).to eq('myname')
    end

    it "allows dots in the middle" do
      expect(UserNameSuggester.suggest("my.name")).to eq('my.name')
    end

    it "remove leading dots" do
      expect(UserNameSuggester.suggest(".myname")).to eq('myname')
    end

    it "remove trailing dots" do
      expect(UserNameSuggester.suggest("myname.")).to eq('myname')
    end

    it 'handles usernames with a sequence of 2 or more special chars' do
      expect(UserNameSuggester.suggest('Darth__Vader')).to eq('Darth_Vader')
      expect(UserNameSuggester.suggest('Darth_-_Vader')).to eq('Darth_Vader')
    end

    it 'should handle typical facebook usernames' do
      expect(UserNameSuggester.suggest('roger.nelson.3344913')).to eq('roger.nelson.33')
    end

    it 'removes underscore at the end of long usernames that get truncated' do
      expect(UserNameSuggester.suggest('uuuuuuuuuuuuuu_u')).to_not end_with('_')
    end

    it "adds number if it's too short after removing trailing underscore" do
      User.stubs(:username_length).returns(8..8)
      expect(UserNameSuggester.suggest('uuuuuuu_u')).to eq('uuuuuuu1')
    end
  end

end