# RSpec::Parameterized
#   Sample
#     plus
#       [1, 2, 3]
#         should do additions
#       [5, 8, 13]
#         should do additions
#       [0, 0, 0]
#         should do additions

describe RSpec::Parameterized do
  describe "where and with_them" do
    where(:a, :b, :answer) do
      [
        [1 , 2 , 3],
        [5 , 8 , 13],
        [0 , 0 , 0]
      ]
    end

    with_them do
      it "should do additions" do
        expect(a + b).to eq answer
      end
    end

    with_them do
      it "#{params[:a]} + #{params[:b]} == #{params[:answer]}" do
        expect(a + b).to eq answer
      end
    end

    with_them pending: "PENDING" do
      it "should do additions" do
        expect(a + b).to == answer
      end
    end
  end

  describe "lambda parameter" do
    where(:a, :b, :answer) do
      [
        [1 , 2 , -> {should == 3}],
        [5 , 8 , -> {should == 13}],
        [0 , 0 , -> {should == 0}]
      ]
    end

    with_them do
      subject {a + b}
      it "should do additions" do
        self.instance_exec(&answer)
      end
    end
  end

  describe "Hash arguments" do
    where(a: [1, 3], b: [5, 7, 9], c: [2, 4])

    with_them do
      it "sums is even" do
        expect(a + b + c).to be_even
      end
    end
  end

  describe "Verbose syntax" do
    where do
      {
        "positive integers" => {
          a: 1,
          b: 2,
          answer: 3,
        },
        "negative_integers" => {
          a: -1,
          b: -2,
          answer: -3,
        },
        "mixed_integers" => {
          a: 3,
          b: -3,
          answer: 0,
        },
      }
    end

    with_them do
      it "should do additions" do
        expect(a + b).to eq answer
      end

      it "should have custom name" do |example|
        expect(example.metadata[:example_group][:description]).to eq case_name
      end
    end

    context "lambda parameter" do
      where do
        {
          "integers" => {
            a: 1,
            b: 2,
            answer: -> {expect(subject).to eq 3},
          },
          "strings" => {
            a: "hello ",
            b: "world",
            answer: -> {expect(subject).to include "lo wo"},
          },
          "arrays" => {
            a: [1, 2, 3],
            b: [4, 5, 6],
            answer: -> {expect(subject.size).to eq 6}
          }
        }
      end

      with_them do
        subject {a + b}
        it "should do additions" do
          self.instance_exec(&answer)
        end

        it "should have custom name" do |example|
          expect(example.metadata[:example_group][:description]).to eq(case_name)
        end
      end
    end
  end

  describe "Custom test case name" do
    context "when regular arguments" do
      where(:case_name, :a, :b, :answer) do
        [
          ["positive integers",  6,  2,  8],
          ["negative integers", -1, -2, -3],
          [   "mixed integers", -5,  3, -2],
        ]
      end

      with_them do
        it "should do additions" do
          expect(a + b).to eq answer
        end

        it "should have custom test name" do |example|
          expect(example.metadata[:example_group][:description]).to eq case_name
        end
      end
    end

    context "when hash arguments" do
      where(case_names: ->(a, b, c){"#{a} + #{b} + #{c}"}, a: [1, 3], b: [5, 7, 9], c: [2, 4])

      with_them do
        it "sum is even" do
          expect(a + b + c).to be_even
        end

        it "should have custom names" do |example|
          expect(example.metadata[:example_group][:description]).to include "+"
        end
      end
    end
  end

  describe "ref" do
    context 'simple usecase' do
      let(:foo) { 1 }

      where(:value, :answer) do
        [
          [ref(:foo), 1],
        ]
      end

      with_them do
        it "let variable in same example group can be used" do
          expect(value).to eq answer
        end

        context "override let varibale" do
          let(:foo) { 3 }

          it "can override let variable" do
            expect(value).to eq 3
          end
        end
      end
    end

    context "recursive usecase" do
      let(:foo) { 1 }

      where(:value, :answer) do
        [
          [[ref(:foo), 2], [1, 2]],
        ]
      end

      with_them do
        it "let variable in same example group can be used" do
          expect(value).to eq answer
        end

        context "override let varibale" do
          let(:foo) { 3 }

          it "can override let variable" do
            expect(value).to eq [3, 2]
          end
        end
      end
    end
  end

  describe "lazy" do
    context "simple usecase" do
      let(:one) { 1 }
      let(:four) { 4 }

      where(:a, :b, :answer) do
        [
          [ref(:one), ref(:four), lazy { two + three }],
        ]
      end

      with_them do
        context "define two and three after where block" do
          let(:two) { 2 }
          let(:three) { 3 }

          it "should do additions" do
            expect(a + b).to eq answer
          end
        end
      end
    end

    context 'recursive usecase' do
      let(:one) { 1 }
      let(:four) { 4 }

      where(:a, :b, :answer) do
        [
          [ref(:one), ref(:four), { result: lazy { two + three } }],
        ]
      end

      with_them do
        context "define two and three after where block" do
          let(:two) { 2 }
          let(:three) { 3 }

          it "should do additions" do
            expect(a + b).to eq answer[:result]
          end
        end
      end
    end

    context "have multibyte string usecase" do
      context 'only in lazy' do
        where(:value, :answer) do
          [
            ["non multibyte parameter", lazy { "パラメータ is non multibyte parameter" }]
          ]
        end

        with_them do
          it "should run with correct description" do
            expect("パラメータ is #{value}").to eq answer
          end
        end
      end

      context 'with multibyte other parameter' do
        where(:value, :answer) do
          [
            ["lazyとは別のパラメータ", lazy { "パラメータ is lazyとは別のパラメータ" }]
          ]
        end

        with_them do
          it "should run with correct description" do
            expect("パラメータ is #{value}").to eq answer
          end
        end
      end

      context 'use マルチバイト in ancestor context description' do
        where(:value, :answer) do
          [
            ["non multibyte parameter", lazy { "パラメータ is non multibyte parameter"}]
          ]
        end

        with_them do
          it "should run with correct description" do
            expect("パラメータ is #{value}").to eq answer
          end
        end
      end
    end
  end

  context "when the where block is after with_them" do
    with_them do
      it "should do additions" do
        expect(a + b).to eq answer
      end
    end

    with_them do
      subject { a }
      it { should be_a Numeric }
    end

    where(:a, :b, :answer) do
      [
        [1 , 2 , 3],
        [5 , 8 , 13],
        [0 , 0 , 0]
      ]
    end
  end

  context "when the where block is between with_thems" do
    with_them do
      it "should do additions" do
        expect(a + b).to eq answer
      end
    end

    where(:a, :b, :answer) do
      [
        [1 , 2 , 3],
        [5 , 8 , 13],
        [0 , 0 , 0]
      ]
    end

    with_them do
      subject { a }
      it { should be_a Numeric }
    end
  end

  context "when the where has only one parameter to be set" do
    where(:x) do
      [1, 2, 3]
    end

    with_them do
      it 'can take an array of elements' do
        expect(x).to eq x
      end
    end
  end

  context "when the where has let variables, defined by parent example group" do
    describe "parent (define let)" do
      let(:five) { 5 }
      let(:eight) { 8 }

      describe "child 1" do
        where(:a, :b, :answer) do
          [
            [1 , 2 , 3],
            [five , eight , 13],
          ]
        end

        with_them do
          it "a plus b is answer" do
            expect(a + b).to eq answer
          end
        end
      end

      let(:eq_matcher) { eq(13) }
      describe "child 3 (use matcher)" do
        where(:a, :b, :matcher) do
          [
            [1    , 2     , eq(3) ],
            [five , eight , eq_matcher],
          ]
        end

        with_them do
          it "a plus b is answer" do
            expect(a + b).to matcher
          end
        end
      end
    end
  end
end