# frozen_string_literal: true

require 'test_helper'

class DevServerProxyTest < ViteRails::Test
  include Rack::Test::Methods

  def app
    # Capture all changes to the env made by the proxy.
    capture_app = Rack::Builder.new.run(->(env) {
      [200, { 'Content-Type' => 'application/json' }, env.to_json]
    })
    # Avoid actually using the proxy.
    Rack::Proxy.define_method(:perform_request) { |env| capture_app.call(env) }

    ViteRails::DevServerProxy.new(capture_app)
  end

  def test_non_asset
    get_with_dev_server_running '/'
    assert_not_forwarded
  end

  def test_non_vite_asset
    get_with_dev_server_running '/example_import.js'
    assert_not_forwarded
  end

  def test_vite_asset
    get_with_dev_server_running '/vite-production/application.js'
    assert_forwarded to: '/application.js'
  end

  def test_vite_client
    get_with_dev_server_running '/@vite/client'
    assert_forwarded to: '/@vite/client'
  end

  def test_vite_import
    get_with_dev_server_running '/@fs//package/example/app/frontend/App.vue?import&t=1611322300214&vue&type=style&index=0&lang.css'
    assert_forwarded to: '/@fs//package/example/app/frontend/App.vue?import&t=1611322300214&vue&type=style&index=0&lang.css'
  end

  def test_hmr_for_stylesheet
    get_with_dev_server_running '/colored.css?t=1611322562923'
    assert_forwarded to: '/colored.css?t=1611322562923'
  end

  def test_hmr_for_imported_entrypoint
    get_with_dev_server_running '/colored.css?import&t=1611322562923'
    assert_forwarded to: '/colored.css?import&t=1611322562923'
  end

  def test_entrypoint_imported_from_entrypoint
    header 'Referer', 'http://localhost:3000/vite-production/application.js'
    get_with_dev_server_running '/example_import.js'
    assert_forwarded to: '/example_import.js'
  end

  def test_without_dev_server_running
    get '/vite-production/application.js'
    assert_not_forwarded

    get '/colored.css?import&t=1611322562923'
    assert_not_forwarded

    header 'Referer', 'http://localhost:3000/vite-production/application.js'
    get '/example_import.js'
    assert_not_forwarded
  end

private

  def get_with_dev_server_running(*args)
    with_dev_server_running {
      get(*args)
    }
  end

  def assert_not_forwarded
    assert last_response.ok?
    env = JSON.parse(last_response.body)
    assert_nil env['HTTP_X_FORWARDED_HOST']
    assert_nil env['HTTP_X_FORWARDED_PORT']
  end

  def assert_forwarded(to: nil)
    assert last_response.ok?
    env = JSON.parse(last_response.body)

    assert_equal ViteRails.config.host, env['HTTP_X_FORWARDED_HOST']
    assert_equal ViteRails.config.port, Integer(env['HTTP_X_FORWARDED_PORT'])

    return unless to

    path, query = to.split('?')
    assert_equal path, env['PATH_INFO']
    assert_equal query, env['QUERY_STRING']
    assert_equal to, env['REQUEST_URI']
  end
end