# frozen_string_literal: true

require_relative "../helper"
require "rack/test"
require "web/server"

describe "the server" do
  include Rack::Test::Methods

  let(:app) { Web::Server.freeze }
  let(:json) { Oj.load(last_response.body) }
  let(:headers) { last_response.headers }

  it "returns link to docs" do
    get "/"
    _(json["docs"]).wont_be_nil
  end

  it "returns latest quotes" do
    get "/latest"
    _(last_response).must_be(:ok?)
  end

  it "sets base currency" do
    get "/latest"
    res = Oj.load(last_response.body)
    get "/latest?from=USD"
    _(json).wont_equal(res)
  end

  it "sets base amount" do
    get "/latest?amount=10"
    _(json["rates"]["USD"]).must_be(:>, 10)
  end

  it "filters symbols" do
    get "/latest?to=USD"
    _(json["rates"].keys).must_equal(["USD"])
  end

  it "returns historical quotes" do
    get "/2012-11-20"
    _(json["rates"]).wont_be(:empty?)
    _(json["date"]).must_equal("2012-11-20")
  end

  it "works around holidays" do
    get "/2010-01-01"
    _(json["rates"]).wont_be(:empty?)
  end

  it "returns an ETag" do
    ["/latest", "/2012-11-20"].each do |path|
      get path
      _(headers["ETag"]).wont_be_nil
    end
  end

  it "returns a cache control header" do
    ["/latest", "/2012-11-20"].each do |path|
      get path
      _(headers["Cache-Control"]).wont_be_nil
    end
  end

  it "allows cross-origin requests" do
    ["/", "/latest", "/2012-11-20"].each do |path|
      header "Origin", "*"
      get path

      assert headers.key?("Access-Control-Allow-Methods")
    end
  end

  it "responds to preflight requests" do
    ["/", "/latest", "/2012-11-20"].each do |path|
      header "Origin", "*"
      header "Access-Control-Request-Method", "GET"
      header "Access-Control-Request-Headers", "Content-Type"
      options path

      assert headers.key?("Access-Control-Allow-Methods")
    end
  end

  it "converts an amount" do
    get "/latest?from=GBP&to=USD&amount=100"
    _(json["rates"]["USD"]).must_be(:>, 100)
  end

  it "returns rates for a given period" do
    get "/2010-01-01..2010-12-31"
    _(json["start_date"]).wont_be(:empty?)
    _(json["end_date"]).wont_be(:empty?)
    _(json["rates"]).wont_be(:empty?)
  end

  it "returns rates when given period does not include end date" do
    get "/2010-01-01.."
    _(json["start_date"]).wont_be(:empty?)
    _(json["end_date"]).wont_be(:empty?)
    _(json["rates"]).wont_be(:empty?)
  end

  it "returns currencies" do
    get "/currencies"
    _(json["USD"]).must_equal("United States Dollar")
  end

  it "handles JSONP" do
    get "/latest?callback=foo"
    _(last_response.body).must_be(:start_with?, "/**/foo")
  end

  it "sets charset to utf-8" do
    get "/currencies"
    _(last_response.headers["content-type"]).must_be(:end_with?, "charset=utf-8")
  end
end