require 'swagger_helper'
require 'rswag/specs/swagger_formatter'

# This spec file validates OpenAPI output generated by spec metadata.
# Specifically here, we look at OpenApi 3 as documented at
# https://swagger.io/docs/specification/about/

RSpec.describe 'Generated OpenApi', type: :request, swagger_doc: 'v3/openapi.json' do
  before do |example|
    output = double('output').as_null_object
    swagger_root = File.expand_path('tmp/swagger', __dir__)
    config = double('config', swagger_root: swagger_root, get_swagger_doc: swagger_doc )
    formatter = Rswag::Specs::SwaggerFormatter.new(output, config)
    
    example_group = OpenStruct.new(group: OpenStruct.new(metadata: example.metadata))
    formatter.example_group_finished(example_group)
  end

  # Framework definition, to be overridden for contexts
  let(:swagger_doc) do
    { # That which would be defined in swagger_helper.rb
      openapi: api_openapi,
      info: {},
      servers: api_servers,
      produces: api_produces,
      components: api_components
    }
  end
  let(:api_openapi) { '3.0.3' }
  let(:api_servers) {[{ url: "https://api.example.com/foo" }]}
  let(:api_produces) { ['application/json'] }
  let(:api_components) { {} }

  describe 'Basic Structure'

  describe 'API Server and Base Path' do
    path '/stubs' do
      get 'a summary' do
        tags 'Server and Path'

        response '200', 'OK' do
          run_test!

          it 'lists server' do
            tree = swagger_doc.dig(:servers)
            expect(tree).to eq([
              { url: "https://api.example.com/foo" }
            ])
          end

          context "multiple" do
            let(:api_servers) {[
              { url: "https://api.example.com/foo" },
              { url: "http://api.example.com/foo" },
            ]}

            it 'lists servers' do
              tree = swagger_doc.dig(:servers)
              expect(tree).to eq([
                { url: "https://api.example.com/foo" },
                { url: "http://api.example.com/foo" }
              ])
            end
          end

          context "with variables" do
            let(:api_servers) {[{
              url: "https://{defaultHost}/foo",
              variables: {
                defaultHost: {
                  default: "api.example.com" 
                }
              }
            }]}

            it 'lists server and variables' do
              tree = swagger_doc.dig(:servers)
              expect(tree).to eq([{
                url: "https://{defaultHost}/foo",
                variables: {
                  defaultHost: {
                    default: "api.example.com" 
                  }
                }
              }])
            end
          end

          # TODO: Enum variables, defaults, override at path/operation
        end
      end
    end
  end

  describe 'Media Types' do
    path '/stubs' do
      get 'a summary' do
        tags 'Media Types'

        response '200', 'OK' do
          run_test!

          it 'declares output as application/json' do
            pending "Not yet implemented?"
            tree = swagger_doc.dig(:paths, "/stubs", :get, :responses, '200', :content)
            expect(tree).to have_key('application/json')
          end
        end
      end
    end
  end

  describe 'Paths and Operations'

  describe 'Parameter Serialization' do
    describe 'Path Parameters' do
      path '/stubs/{a_param}' do
        get 'a summary' do
          tags 'Parameter Serialization: Query String'
          produces 'application/json'

          parameter(
            name: 'a_param',
            in: :path,
          )
          let(:a_param) { "42" }

          response '200', 'OK' do
            run_test!

            it 'declares parameter in path' do
              tree = swagger_doc.dig(:paths, "/stubs/{a_param}", :get, :parameters)
              expect(tree.first[:name]).to eq('a_param')
              expect(tree.first[:in]).to eq(:path)
            end

            it 'declares path parameters as required' do
              tree = swagger_doc.dig(:paths, "/stubs/{a_param}", :get, :parameters)
              expect(tree.first[:required]).to eq(true)
            end
          end
        end
      end
    end

    describe 'Query Parameters' do
      path '/stubs' do
        get 'a summary' do
          tags 'Parameter Serialization: Query String'
          produces 'application/json'

          parameter(
            name: 'a_param',
            in: :query,
          )
          let(:a_param) { "a foo" }

          response '200', 'OK' do
            run_test!

            it 'declares parameter in query string' do
              tree = swagger_doc.dig(:paths, "/stubs", :get, :parameters)
              expect(tree.first[:name]).to eq('a_param')
              expect(tree.first[:in]).to eq(:query)
            end
          end

          # TODO: Serialization (form/spaceDelimited/pipeDelimited/deepObject)
        end
      end
    end

    # TODO: Header
    # TODO: Cookie
    # TODO: Default values
    # TODO: Enum
    # TODO: Constant
    # TODO: Empty/Nullable
    # TODO: Examples
    # TODO: Deprecated
    # TODO: Common Parameters
  end

  describe 'Request Body' do
    path '/stubs' do
      post 'body is required' do
        tags 'Media Types'
        consumes 'multipart/form-data'
        parameter name: :file, :in => :formData, :type => :file, required: true

        let(:file) { Rack::Test::UploadedFile.new(Rails.root.join("spec/fixtures/thumbnail.png")) }

        response '200', 'OK' do
          run_test!

          it 'declares requestBody is required' do
            pending "This output is massaged in SwaggerFormatter#stop, and isn't quite ready here to assert"
            tree = swagger_doc.dig(:paths, "/stubs", :post, :requestBody)
            expect(tree[:required]).to eq(true)
          end
        end
      end
    end
  end

  describe 'Responses'
  describe 'Data Models (Schemas)'
  describe 'Examples'
  describe 'Authentication'
  describe 'Links'
  describe 'Callbacks'
  describe 'Components Section'
  describe 'Using $ref'
  describe 'Grouping Operations with Tags'


  # path '/blogs' do
  #   post 'Creates a blog' do
  #     tags 'Blogs'
  #     description 'Creates a new blog from provided data'
  #     operationId 'createBlog'
  #     consumes 'application/json'
  #     produces 'application/json'
  #     parameter name: :blog, in: :body, schema: { '$ref' => '#/definitions/blog' }

  #     let(:blog) { { title: 'foo', content: 'bar' } }

  #     response '201', 'blog created' do
  #       # schema '$ref' => '#/definitions/blog'
  #       run_test!
  #     end

  #     response '422', 'invalid request' do
  #       schema '$ref' => '#/definitions/errors_object'

  #       let(:blog) { { title: 'foo' } }
  #       run_test! do |response|
  #         expect(response.body).to include("can't be blank")
  #       end

  #       it 'outputs parameters' do
  #         pp swagger_doc
  #         params = swagger_doc.dig(:paths, "/blogs", :post, :parameters)
  #         expect(params[0][:name]).to eq(:blog)
  #       end
  #     end
  #   end

  #   get 'Searches blogs' do
  #     tags 'Blogs'
  #     description 'Searches blogs by keywords'
  #     operationId 'searchBlogs'
  #     produces 'application/json'
  #     parameter name: :keywords, in: :query, type: 'string'

  #     let(:keywords) { 'foo bar' }

  #     response '200', 'success' do
  #       schema type: 'array', items: { '$ref' => '#/definitions/blog' }
  #     end

  #     response '406', 'unsupported accept header' do
  #       let(:'Accept') { 'application/foo' }
  #       run_test!
  #     end
  #   end
  # end

  # path '/blogs/flexible' do
  #   post 'Creates a blog flexible body' do
  #     tags 'Blogs'
  #     description 'Creates a flexible blog from provided data'
  #     operationId 'createFlexibleBlog'
  #     consumes 'application/json'
  #     produces 'application/json'

  #     parameter name: :flexible_blog, in: :body, schema: {
  #       oneOf: [
  #         { '$ref' => '#/definitions/blog' },
  #         { '$ref' => '#/definitions/flexible_blog' }
  #       ]
  #     }

  #     let(:flexible_blog) { { blog: { headline: 'my headline', text: 'my text' } } }

  #     response '201', 'flexible blog created' do
  #       schema oneOf: [{ '$ref' => '#/definitions/blog' }, { '$ref' => '#/definitions/flexible_blog' }]
  #       run_test!
  #     end
  #   end
  # end

  # path '/blogs/{id}' do
  #   parameter name: :id, in: :path, type: :string

  #   let(:id) { blog.id }
  #   let(:blog) { Blog.create(title: 'foo', content: 'bar', thumbnail: 'thumbnail.png') }

  #   get 'Retrieves a blog' do
  #     tags 'Blogs'
  #     description 'Retrieves a specific blog by id'
  #     operationId 'getBlog'
  #     produces 'application/json'

  #     response '200', 'blog found' do
  #       header 'ETag', type: :string
  #       header 'Last-Modified', type: :string
  #       header 'Cache-Control', type: :string

  #       schema '$ref' => '#/definitions/blog'

  #       examples 'application/json' => {
  #         id: 1,
  #         title: 'Hello world!',
  #         content: 'Hello world and hello universe. Thank you all very much!!!',
  #         thumbnail: 'thumbnail.png'
  #       }

  #       let(:id) { blog.id }
  #       run_test!
  #     end

  #     response '404', 'blog not found' do
  #       let(:id) { 'invalid' }
  #       run_test!
  #     end
  #   end
  # end

  # path '/blogs/{id}/upload' do
  #   parameter name: :id, in: :path, type: :string

  #   let(:id) { blog.id }
  #   let(:blog) { Blog.create(title: 'foo', content: 'bar') }

  #   put 'Uploads a blog thumbnail' do
  #     tags 'Blogs'
  #     description 'Upload a thumbnail for specific blog by id'
  #     operationId 'uploadThumbnailBlog'
  #     consumes 'multipart/form-data'
  #     parameter name: :file, :in => :formData, :type => :file, required: true

  #     response '200', 'blog updated' do
  #       let(:file) { Rack::Test::UploadedFile.new(Rails.root.join("spec/fixtures/thumbnail.png")) }
  #       run_test!
  #     end
  #   end
  # end
end