# frozen_string_literal: true

require "i18n/backend/fallback_locale_list"

RSpec.describe I18n::Backend::FallbackLocaleList do
  let(:list) { I18n::Backend::FallbackLocaleList.new }

  it "works when default_locale is English" do
    SiteSetting.default_locale = :en

    expect(list[:ru]).to eq(%i[ru en])
    expect(list[:en]).to eq([:en])
  end

  it "works when default_locale is English (UK)" do
    SiteSetting.default_locale = :en_GB

    expect(list[:ru]).to eq(%i[ru en])
    expect(list[:en_GB]).to eq(%i[en_GB en])
    expect(list[:en]).to eq([:en])
  end

  it "works when default_locale is not English" do
    SiteSetting.default_locale = :de

    expect(list[:ru]).to eq(%i[ru en])
    expect(list[:de]).to eq(%i[de en])
    expect(list[:en]).to eq([:en])
    expect(list[:en_GB]).to eq(%i[en_GB en])
  end

  context "when plugin registered fallback locale" do
    before do
      DiscoursePluginRegistry.register_locale("es_MX", fallbackLocale: "es")
      DiscoursePluginRegistry.register_locale("de_AT", fallbackLocale: "de")
      DiscoursePluginRegistry.register_locale("de_AT-formal", fallbackLocale: "de_AT")
    end

    after { DiscoursePluginRegistry.reset! }

    it "works when default_locale is English" do
      SiteSetting.default_locale = :en

      expect(list[:de_AT]).to eq(%i[de_AT de en])
      expect(list[:"de_AT-formal"]).to eq([:"de_AT-formal", :de_AT, :de, :en])
      expect(list[:de]).to eq(%i[de en])
      expect(list[:en]).to eq([:en])
    end

    it "works when default_locale is English (UK)" do
      SiteSetting.default_locale = :en_GB

      expect(list[:de_AT]).to eq(%i[de_AT de en])
      expect(list[:"de_AT-formal"]).to eq([:"de_AT-formal", :de_AT, :de, :en])
      expect(list[:de]).to eq(%i[de en])
      expect(list[:en]).to eq([:en])
      expect(list[:en_GB]).to eq(%i[en_GB en])
    end

    it "works when default_locale is not English" do
      SiteSetting.default_locale = :de

      expect(list[:es_MX]).to eq(%i[es_MX es en])
      expect(list[:"de_AT-formal"]).to eq([:"de_AT-formal", :de_AT, :de, :en])
      expect(list[:es]).to eq(%i[es en])
      expect(list[:en]).to eq([:en])
    end
  end
end