# frozen_string_literal: true

require 'rails_helper'

RSpec.describe Resolvers::BaseResolver, type: :graphql do
  let!(:resolver) do
    Class.new(described_class) do
      def resolve(**args)
        [args, args]
      end
    end
  end

  after do
    # We need to make sure class instance variables are unset between runs.
    described_class.instance_variable_set '@plurals', nil
    resolver.instance_variable_set '@plurals', nil
  end

  let(:instance) { resolver.new(object: nil, context: {}) }
  let(:args) { {} }

  describe '.single' do
    it 'returns a subclass from the resolver' do
      expect(resolver.single.superclass).to eq(resolver)
    end

    it 'returns the same subclass every time' do
      expect(resolver.single.object_id).to eq(resolver.single.object_id)
    end

    it 'returns a resolver that gives the first result from the original resolver' do
      result = resolve(resolver.single, args: {test: 1})

      expect(result).to eq(test: 1)
    end
  end

  describe '.argument_with_plural' do
    let(:field) { :foo }
    let(:type) { String }
    let(:args) { {required: true} }

    subject { resolver.argument_with_plural(field, type, args) }

    it 'adds the plural and base fields' do
      expect(described_class).to receive(:argument).with(field, type, args)
      expect(described_class).to receive(:argument).with(:foos, [type], required: false)
      subject
    end

    it 'updates plurals list' do
      subject
      expect(resolver.plurals).to eq(foo: :foos)
    end
  end

  describe '.plurals' do
    subject { resolver.plurals }

    it 'returns hash of plurals' do
      expect(subject).to eq({})
      resolver.argument_with_plural(:foo, String, required: false)
      expect(subject).to eq(foo: :foos)
    end
  end

  describe '#plurals' do
    subject { instance.plurals }
    before { resolver.argument_with_plural(:foo, String, required: false) }
    it { is_expected.to eq(foo: :foos) }
  end

  describe '#clobber_id_with_iid!' do
    context 'args has both id and iid' do
      let(:args) { {id: '1', iid: '3'} }
      specify { expect { instance.clobber_id_with_iid!(args) }.to raise_error(APIError::BaseError) }
    end

    context 'args has only id or iid' do
      before { instance.clobber_id_with_iid!(args) }
      subject { args }

      context 'args has only id' do
        let(:args) { {id: '1'} }
        it { is_expected.to eq(id: '1') }
      end

      context 'args has only iid' do
        let(:args) { {iid: '3'} }
        it { is_expected.to eq(id: '3') }
      end
    end
  end

  describe '#combine_ids_with_iids!' do
    before { instance.combine_ids_with_iids!(args) }
    subject { args }

    context 'args has both ids and iids' do
      let(:args) { {ids: '1', iids: %w[3 5]} }
      it { is_expected.to eq(ids: %w[1 3 5]) }
    end

    context 'args has only ids' do
      let(:args) { {ids: ['1']} }
      it { is_expected.to eq(ids: ['1']) }
    end

    context 'args has only iids' do
      let(:args) { {iids: %w[3 5]} }
      it { is_expected.to eq(ids: %w[3 5]) }
    end
  end

  describe '#combine_plurals!' do
    subject { args }

    before do
      resolver.argument_with_plural(:foo, String, required: false)
      resolver.argument_with_plural(:bar, String, required: false)
      instance.combine_plurals!(args)
    end

    context 'args has both singular and plural' do
      let!(:args) { {foo: '1', foos: %w[3 5], bar: 'a', bars: %w[b c]} }
      it { is_expected.to eq(foo: %w[1 3 5], bar: %w[a b c]) }
    end

    context 'args has only singular' do
      let!(:args) { {foo: ['1']} }
      it { is_expected.to eq(foo: ['1']) }
    end

    context 'args has only plural' do
      let!(:args) { {foos: %w[3 5]} }
      it { is_expected.to eq(foo: %w[3 5]) }
    end
  end

  describe '#decode_id' do
    subject { instance.decode_id(args) }

    context 'with id given' do
      let(:args) { {id: '1'} }

      it 'uses the GraphQL decode built in' do
        expect(GraphQL::Schema::UniqueWithinType).to receive(:decode).with(args[:id]).and_return([nil, 'not 1'])
        subject
        expect(args[:id]).to eq('not 1')
      end
    end

    context 'without id given' do
      it 'changes nothing' do
        expect(GraphQL::Schema::UniqueWithinType).not_to receive(:decode)
        subject
        expect(args[:id]).to be_nil
      end
    end
  end

  describe '#decode_ids' do
    subject { instance.decode_ids(args) }

    context 'with ids given' do
      let(:args) { {ids: ['1']} }

      it 'uses the GraphQL decode built in' do
        expect(GraphQL::Schema::UniqueWithinType).to receive(:decode).with(args[:ids].first).and_return([nil, 'not 1'])
        subject
        expect(args[:ids]).to eq(['not 1'])
      end
    end

    context 'without ids given' do
      it 'uses the GraphQL decode built in' do
        expect(GraphQL::Schema::UniqueWithinType).not_to receive(:decode)
        subject
        expect(args[:ids]).to be_nil
      end
    end
  end

  describe '#prepare_args!' do
    subject { instance.prepare_args!(args) }

    it 'prepares arguments' do
      expect(instance).to receive(:decode_id).once
      expect(instance).to receive(:decode_ids).once
      expect(instance).to receive(:clobber_id_with_iid!).once
      expect(instance).to receive(:combine_ids_with_iids!).once
      expect(instance).to receive(:combine_plurals!).once
      subject
    end
  end
end