class Ci::Drone::Request
  # Converts the response body to an ObjectifiedHash.
  def self.parse(body)
    body = decode(body)

    if body.is_a? Hash
      ObjectifiedHash.new body
    elsif body.is_a? Array
      body.collect! { |e| ObjectifiedHash.new(e) }
    elsif body == true
      body
    else
      raise Error::Parsing.new "Couldn't parse a response body"
    end
  end

  # Decodes a JSON response into Ruby object.
  def self.decode(response)
    begin
      JSON.load response
    rescue JSON::ParserError
      raise Error::Parsing.new "The response is not a valid JSON"
    end
  end

  def get(endpoint, path, options={})
    validate_request_params!(endpoint)
    request(:get, endpoint, path, options)
  end

  def post(endpoint, path, options={})
    validate_request_params!(endpoint)
    request(:post, endpoint, path, options)
  end

  def put(endpoint, path, options={})
    validate_request_params!(endpoint)
    request(:put, endpoint, path, options)
  end

  def patch(endpoint, path, options={})
    validate_request_params!(endpoint)
    request(:patch, endpoint, path, options)
  end

  def delete(endpoint, path, options={})
    validate_request_params!(endpoint)
    request(:delete, endpoint, path, options)
  end

  private
    def request(method, endpoint, path, **params)
      Rails.logger.info("[drone] request: #{method} #{path} #{params.except(:drone_token).inspect}")

      client ||= begin
        Faraday.new(url: endpoint) do |req|
          req.request :url_encoded
          req.headers['Content-Type'] = 'application/json'
          req.response :logger # 显示日志
          req.adapter Faraday.default_adapter
          req.authorization :Bearer, params[:drone_token]
          req.headers['Authorization']
        end
      end
      response = client.public_send(method, path) do |req|
        req.body = params.except(:drone_token).to_json
      end

      json_response(response)
    end

    # Checks the response code for common errors.
    # Returns parsed response for successful requests.
    def validate(response)
      # case response.code
      #   when 400; raise Error::BadRequest.new error_message(response)
      #   when 401; raise Error::Unauthorized.new error_message(response)
      #   when 403; raise Error::Forbidden.new error_message(response)
      #   when 404; raise Error::NotFound.new error_message(response)
      #   when 405; raise Error::MethodNotAllowed.new error_message(response)
      #   when 406; raise Error::DataNotAccepted.new error_message(response)
      #   when 409; raise Error::Conflict.new error_message(response)
      #   when 500; raise Error::InternalServerError.new error_message(response)
      #   when 502; raise Error::BadGateway.new error_message(response)
      #   when 503; raise Error::ServiceUnavailable.new error_message(response)
      # end

      response.parsed_response
    end

    # Checks a base_uri and params for requests.
    def validate_request_params!(endpoint)
      raise "Please set an endpoint to API" unless endpoint
    end

    def error_message(response)
      "Server responded with code #{response.code}, message: #{response.parsed_response.message}. " \
      "Request URI: #{response.request.base_uri}#{response.request.path}"
    end

    def json_response(response)
      result = JSON.parse(response.body)
      status = response.status
      Rails.logger.info("[drone] response:#{status} #{result.inspect}")

      response.status != 200 ? result.merge!(status: response.status) : result
    end
end
