# frozen_string_literal: true

require 'spec_helper'

RSpec.describe BulkImports::Clients::HTTP do
  include ImportSpecHelper

  let(:url) { 'http://gitlab.example' }
  let(:token) { 'token' }
  let(:resource) { 'resource' }
  let(:version) { "#{BulkImport::MIN_MAJOR_VERSION}.0.0" }
  let(:enterprise) { false }
  let(:response_double) { double(code: 200, success?: true, parsed_response: {}) }
  let(:metadata_response) do
    double(
      code: 200,
      success?: true,
      parsed_response: {
        'version' => version,
        'enterprise' => enterprise
      }
    )
  end

  before do
    allow(Gitlab::HTTP).to receive(:get)
      .with('http://gitlab.example/api/v4/version', anything)
      .and_return(metadata_response)
  end

  subject { described_class.new(url: url, token: token) }

  shared_examples 'performs network request' do
    it 'performs network request' do
      expect(Gitlab::HTTP).to receive(method).with(*expected_args).and_return(response_double)

      subject.public_send(method, resource)
    end

    context 'error handling' do
      context 'when error occurred' do
        it 'raises BulkImports::Error' do
          allow(Gitlab::HTTP).to receive(method).and_raise(Errno::ECONNREFUSED)

          expect { subject.public_send(method, resource) }.to raise_exception(BulkImports::NetworkError)
        end
      end

      context 'when response is not success' do
        it 'raises BulkImports::Error' do
          response_double = double(code: 503, success?: false, parsed_response: 'Error', request: double(path: double(path: '/test')))

          allow(Gitlab::HTTP).to receive(method).and_return(response_double)

          expect { subject.public_send(method, resource) }.to raise_exception(BulkImports::NetworkError, 'Unsuccessful response 503 from /test. Body: Error')
        end
      end
    end
  end

  describe '#get' do
    let(:method) { :get }

    include_examples 'performs network request' do
      let(:expected_args) do
        [
          'http://gitlab.example/api/v4/resource',
          hash_including(
            query: {
              page: described_class::DEFAULT_PAGE,
              per_page: described_class::DEFAULT_PER_PAGE,
              private_token: token
            },
            headers: {
              'Content-Type' => 'application/json'
            },
            follow_redirects: true,
            resend_on_redirect: false,
            limit: 2
          )
        ]
      end
    end

    describe '#each_page' do
      let(:objects1) { [{ object: 1 }, { object: 2 }] }
      let(:objects2) { [{ object: 3 }, { object: 4 }] }
      let(:response1) { double(success?: true, headers: { 'x-next-page' => 2 }, parsed_response: objects1) }
      let(:response2) { double(success?: true, headers: {}, parsed_response: objects2) }

      before do
        stub_http_get('groups', { page: 1, per_page: 30 }, response1)
        stub_http_get('groups', { page: 2, per_page: 30 }, response2)
      end

      context 'with a block' do
        it 'yields every retrieved page to the supplied block' do
          pages = []

          subject.each_page(:get, 'groups') { |page| pages << page }

          expect(pages[0]).to be_an_instance_of(Array)
          expect(pages[1]).to be_an_instance_of(Array)

          expect(pages[0]).to eq(objects1)
          expect(pages[1]).to eq(objects2)
        end
      end

      context 'without a block' do
        it 'returns an Enumerator' do
          expect(subject.each_page(:get, :foo)).to be_an_instance_of(Enumerator)
        end
      end

      private

      def stub_http_get(path, query, response)
        uri = "http://gitlab.example/api/v4/#{path}"
        params = {
          headers: { "Content-Type" => "application/json" },
          query: { private_token: token },
          follow_redirects: true,
          resend_on_redirect: false,
          limit: 2
        }
        params[:query] = params[:query].merge(query)

        allow(Gitlab::HTTP).to receive(:get).with(uri, params).and_return(response)
      end
    end
  end

  describe '#post' do
    let(:method) { :post }

    include_examples 'performs network request' do
      let(:expected_args) do
        [
          'http://gitlab.example/api/v4/resource',
          hash_including(
            body: {},
            headers: {
              'Content-Type' => 'application/json'
            },
            query: {
              page: described_class::DEFAULT_PAGE,
              per_page: described_class::DEFAULT_PER_PAGE,
              private_token: token
            },
            follow_redirects: true,
            resend_on_redirect: false,
            limit: 2
          )
        ]
      end
    end
  end

  describe '#head' do
    let(:method) { :head }

    include_examples 'performs network request' do
      let(:expected_args) do
        [
          'http://gitlab.example/api/v4/resource',
          hash_including(
            headers: {
              'Content-Type' => 'application/json'
            },
            query: {
              page: described_class::DEFAULT_PAGE,
              per_page: described_class::DEFAULT_PER_PAGE,
              private_token: token
            },
            follow_redirects: true,
            resend_on_redirect: false,
            limit: 2
          )
        ]
      end
    end
  end

  describe '#stream' do
    it 'performs network request with stream_body option' do
      expected_args = [
        'http://gitlab.example/api/v4/resource',
        hash_including(
          stream_body: true,
          headers: {
            'Content-Type' => 'application/json'
          },
          query: {
            page: described_class::DEFAULT_PAGE,
            per_page: described_class::DEFAULT_PER_PAGE,
            private_token: token
          },
          follow_redirects: true,
          resend_on_redirect: false,
          limit: 2
        )
      ]

      expect(Gitlab::HTTP).to receive(:get).with(*expected_args).and_return(response_double)

      subject.stream(resource)
    end
  end

  describe '#instance_version' do
    it 'returns version as an instance of Gitlab::VersionInfo' do
      expect(subject.instance_version).to eq(Gitlab::VersionInfo.parse(version))
    end

    context 'when /version endpoint is not available' do
      it 'requests /metadata endpoint' do
        response_double = double(code: 404, success?: false, parsed_response: 'Not Found', request: double(path: double(path: '/version')))

        allow(Gitlab::HTTP).to receive(:get)
          .with('http://gitlab.example/api/v4/version', anything)
          .and_return(response_double)

        expect(Gitlab::HTTP).to receive(:get)
          .with('http://gitlab.example/api/v4/metadata', anything)
          .and_return(metadata_response)

        expect(subject.instance_version).to eq(Gitlab::VersionInfo.parse(version))
      end
    end
  end

  describe '#instance_enterprise' do
    it 'returns source instance enterprise information' do
      expect(subject.instance_enterprise).to eq(false)
    end

    context 'when enterprise information is missing' do
      let(:enterprise) { nil }

      it 'defaults to true' do
        expect(subject.instance_enterprise).to eq(true)
      end
    end
  end

  describe '#compatible_for_project_migration?' do
    context 'when instance version is lower the the expected minimum' do
      it 'returns false' do
        expect(subject.compatible_for_project_migration?).to be false
      end
    end

    context 'when instance version is at least the expected minimum' do
      let(:version) { "14.4.4" }

      it 'returns true' do
        expect(subject.compatible_for_project_migration?).to be true
      end
    end
  end

  context 'when source instance is incompatible' do
    let(:version) { '13.0.0' }

    it 'raises an error' do
      expect { subject.get(resource) }
        .to raise_error(
          ::BulkImports::Error,
          "Unsupported GitLab Version. Minimum Supported Gitlab Version #{BulkImport::MIN_MAJOR_VERSION}."
        )
    end
  end

  context 'when url is relative' do
    let(:url) { 'http://website.example/gitlab' }

    before do
      allow(Gitlab::HTTP).to receive(:get)
        .with('http://website.example/gitlab/api/v4/version', anything)
        .and_return(metadata_response)
    end

    it 'performs network request to a relative gitlab url' do
      expect(Gitlab::HTTP).to receive(:get).with('http://website.example/gitlab/api/v4/resource', anything).and_return(response_double)

      subject.get(resource)
    end
  end
end