require 'rails_helper'

RSpec.describe 'API locale resolution', type: :request do
  let!(:tag) { create(:tag, primary_name: '日本語正本') }

  it 'defaults an omitted locale to Japanese' do
    get "/tags/#{ tag.id }"

    expect(response).to have_http_status(:ok)
    expect(json.fetch('name')).to eq('日本語正本')
  end

  it 'accepts an explicitly requested active Japanese locale' do
    get "/tags/#{ tag.id }", params: { locale: 'ja' }

    expect(response).to have_http_status(:ok)
    expect(json.fetch('name')).to eq('日本語正本')
  end

  ['', 'en', 'ain', 'Jpan', 'JA', 'unknown', ['ja']].each do |code|
    it "rejects invalid locale #{ code.inspect } instead of defaulting to Japanese" do
      get "/tags/#{ tag.id }", params: { locale: code }

      expect(response).to have_http_status(:not_found)
      expect(response.body).not_to include('日本語正本')
    end
  end

  it 'rejects a supported locale that has not been registered' do
    get "/tags/#{ tag.id }", params: { locale: 'ain-Kana' }

    expect(response).to have_http_status(:not_found)
  end

  it 'rejects an inactive locale' do
    Locale.nipponese.update!(deprecated_at: Time.current)

    get "/tags/#{ tag.id }", params: { locale: 'ja' }

    expect(response).to have_http_status(:not_found)
  end

  it 'does not write posts or tag names under an invalid locale' do
    sign_in_as(create_member_user!)

    expect do
      post '/posts', params: {
          locale: 'en', title: 'invalid locale', url: 'https://example.com/invalid-locale',
          tags: 'unwritten_tag' }
    end.to change(Post, :count).by(0).and change(TagName, :count).by(0)

    expect(response).to have_http_status(:not_found)
  end
end