require_relative "../spec_helper"

describe AcceptHeaders::Language::Negotiator do
  subject { AcceptHeaders::Language::Negotiator }
  let(:language) { AcceptHeaders::Language }

  describe "parsing an accept header" do
    it "returns a sorted array of media primary tags" do
      subject.new("en-*;q=0.2, en-us").list.must_equal [
        language.new('en', 'us'),
        language.new('en', '*', q: 0.2)
      ]

      subject.new("en-*, en-us, *;q=0.8").list.must_equal [
        language.new('en', 'us'),
        language.new('en', '*'),
        language.new('*', '*', q: 0.8)
      ]
    end

    it "ignores the 'Accept-Language:' prefix" do
      subject.new('Accept-Language: en-us').list.must_equal [
        language.new('en', 'us')
      ]
    end

    it "sets media primary tag to */* when the accept header is empty" do
      subject.new('').list.must_equal [
        language.new('*', '*')
      ]
    end

    it "sets media primary tag to */* when the primary tag is only *" do
      subject.new('*').list.must_equal [
        language.new('*', '*')
      ]
    end

    it "defaults q to 1 if it's not explicitly specified" do
      subject.new("en-us").list.must_equal [
        language.new('en', 'plain', q: 1.0)
      ]
    end

    it "strips whitespace from between media primary tags" do
      subject.new("\ten-us\r,\nen-gb\s").list.must_equal [
        language.new('en', 'us'),
        language.new('en', 'gb')
      ]
    end

    it "strips whitespace around q" do
      subject.new("en-us;\tq\r=\n1, en-gb").list.must_equal [
        language.new('en', 'us'),
        language.new('en', 'gb')
      ]
    end

    it "has a q value of 0.001 when parsed q is invalid" do
      subject.new("en-us;q=x").list.must_equal [
        language.new('en', 'plain', q: 0.001)
      ]
    end

    it "skips invalid media primary tags" do
      subject.new("en-us, en-us-omg;q=0.9").list.must_equal [
        language.new('en', 'us', q: 1)
      ]
    end
  end

  describe "negotiate supported languages" do
    it "returns a best matching language" do
      match = language.new('en', 'us')
      n = subject.new('en-*, en-us, *;q=0.8')
      n.negotiate('en-us').must_equal language.new('en', 'us')
    end
  end
end