require 'spec_helper'
require 'spec/support/provider_state_builder'
require 'pact_broker/pacts/merger'
require 'json'

module PactBroker
  module Pacts
    describe Merger do
      let(:example_pact) { load_json_fixture('consumer-provider.json') }
      let(:example_interaction) do
        {
          "description" => "some description",
          "provider_state" => nil,
          "request" => {
            "method" => "get",
            "path" => "/cash_money",
            "headers" => {
              "Content-Type" => "application/json"
            }
          },
          "response" => {
            "status" => 200,
            "body" => "$$$$$$$$",
            "headers" => {
              "Content-Type" => "application/json"
            }
          }
        }
      end

      before :each do
        @pact_to_merge = load_json_fixture('consumer-provider.json')
      end

      it "merges two pacts" do
        @pact_to_merge["interactions"] << example_interaction
        result = merge_pacts(example_pact, @pact_to_merge)
        expect(result["interactions"]).to match_array(example_pact["interactions"].push(example_interaction))
      end

      it "is idempotent" do
        @pact_to_merge["interactions"] << example_interaction
        first_result = merge_pacts(example_pact, @pact_to_merge)
        second_result = merge_pacts(first_result, @pact_to_merge)
        expect(first_result).to contain_hash second_result
      end

      it "overwrites identical interactions" do
        @pact_to_merge["interactions"][0]["response"]["body"] = "changed!"
        result = merge_pacts(example_pact, @pact_to_merge)

        expect(result["interactions"].length).to eq example_pact["interactions"].length
        expect(result["interactions"].first["response"]["body"]).to eq "changed!"
      end

      it "appends interactions with a different provider state" do
        @pact_to_merge["interactions"][0]["provider_state"] = "upside down"

        result = merge_pacts(example_pact, @pact_to_merge)
        expect(result["interactions"].length).to eq example_pact["interactions"].length + 1
      end

      it "appends interactions with a different description" do
        @pact_to_merge["interactions"][0]["description"] = "getting $$$"

        result = merge_pacts(example_pact, @pact_to_merge)
        expect(result["interactions"].length).to eq example_pact["interactions"].length + 1
      end

      it "appends interactions with a different request method" do
        @pact_to_merge["interactions"][0]["request"]["method"] = "delete"

        result = merge_pacts(example_pact, @pact_to_merge)
        expect(result["interactions"].length).to eq example_pact["interactions"].length + 1
      end

      it "appends interactions with a different request path" do
        @pact_to_merge["interactions"][0]["request"]["path"] = "/decrypt_all_passwords"

        result = merge_pacts(example_pact, @pact_to_merge)
        expect(result["interactions"].length).to eq example_pact["interactions"].length + 1
      end

      it "appends interactions which have additional request headers in the new pact" do
        @pact_to_merge["interactions"][0]["request"]["headers"] = { "Accept" => "script/javascript" }

        result = merge_pacts(example_pact, @pact_to_merge)
        expect(result["interactions"].length).to eq example_pact["interactions"].length + 1
      end

      it "appends interactions with different request headers" do
        example_pact["interactions"][0]["request"]["headers"] = { "Content-Type" => "script/javascript" }
        @pact_to_merge["interactions"][0]["request"]["headers"] = { "Content-Type" => "ayy/lmao" }

        result = merge_pacts(example_pact, @pact_to_merge)
        expect(result["interactions"].length).to eq example_pact["interactions"].length + 1
      end

      it "appends interactions with fewer request headers" do
        example_pact["interactions"][0]["request"]["headers"] = { "Content-Type" => "script/javascript" }

        result = merge_pacts(example_pact, @pact_to_merge)
        expect(result["interactions"].length).to eq example_pact["interactions"].length + 1
      end

      # helper that lets these specs deal with hashes instead of JSON strings
      def merge_pacts(a, b, return_hash = true)
        result = PactBroker::Pacts::Merger.merge_pacts(a.to_json, b.to_json)

        return_hash ? JSON.parse(result) : result
      end
    end
  end
end