module MinatoRubyApiClient
  class Configuration
    # Defines url scheme
    attr_accessor :scheme

    # Defines url host
    attr_accessor :host

    # Defines url base path
    attr_accessor :base_path

    # Defines user agent
    attr_accessor :user_agent

    # Defines API keys used with API Key authentications.
    #
    # @return [Hash] key: parameter name, value: parameter value (API key)
    #
    # @example parameter name is "api_key", API key is "xxx" (e.g. "api_key=xxx" in query string)
    #   config.api_key['api_key'] = 'xxx'
    attr_accessor :api_key

    # Defines API key prefixes used with API Key authentications.
    #
    # @return [Hash] key: parameter name, value: API key prefix
    #
    # @example parameter name is "Authorization", API key prefix is "Token" (e.g. "Authorization: Token xxx" in headers)
    #   config.api_key_prefix['api_key'] = 'Token'
    attr_accessor :api_key_prefix

    # Defines the username used with HTTP basic authentication.
    #
    # @return [String]
    attr_accessor :username

    # Defines the password used with HTTP basic authentication.
    #
    # @return [String]
    attr_accessor :password

    # Defines the access token (Bearer) used with OAuth2.
    attr_accessor :access_token

    # Set this to enable/disable debugging. When enabled (set to true), HTTP request/response
    # details will be logged with `logger.debug` (see the `logger` attribute).
    # Default to false.
    #
    # @return [true, false]
    attr_accessor :debugging

    # Defines the logger used for debugging.
    # Default to `Rails.logger` (when in Rails) or logging to STDOUT.
    #
    # @return [#debug]
    attr_accessor :logger

    # Defines the temporary folder to store downloaded files
    # (for API endpoints that have file response).
    # Default to use `Tempfile`.
    #
    # @return [String]
    attr_accessor :temp_folder_path

    # The time limit for HTTP request in seconds.
    # Default to 0 (never times out).
    attr_accessor :timeout

    # Set this to false to skip client side validation in the operation.
    # Default to true.
    # @return [true, false]
    attr_accessor :client_side_validation

    ### TLS/SSL setting
    # Set this to false to skip verifying SSL certificate when calling API from https server.
    # Default to true.
    #
    # @note Do NOT set it to false in production code, otherwise you would face multiple types of cryptographic attacks.
    #
    # @return [true, false]
    attr_accessor :ssl_verify

    ### TLS/SSL setting
    # Any `OpenSSL::SSL::` constant (see https://ruby-doc.org/stdlib-2.5.1/libdoc/openssl/rdoc/OpenSSL/SSL.html)
    #
    # @note Do NOT set it to false in production code, otherwise you would face multiple types of cryptographic attacks.
    #
    attr_accessor :ssl_verify_mode

    ### TLS/SSL setting
    # Set this to customize the certificate file to verify the peer.
    #
    # @return [String] the path to the certificate file
    attr_accessor :ssl_ca_file

    ### TLS/SSL setting
    # Client certificate file (for client certificate)
    attr_accessor :ssl_client_cert

    ### TLS/SSL setting
    # Client private key file (for client certificate)
    attr_accessor :ssl_client_key

    # Set this to customize parameters encoding of array parameter with multi collectionFormat.
    # Default to nil.
    #
    # @see The params_encoding option of Ethon. Related source code:
    # https://github.com/typhoeus/ethon/blob/master/lib/ethon/easy/queryable.rb#L96
    attr_accessor :params_encoding

    def initialize
      @scheme = 'https'
      @host = ''
      @base_path = ''
      @user_agent = ''
      @subscription_key = ''
      @api_key = {}
      @api_key_prefix = {}
      @client_side_validation = true
      @ssl_verify = true
      @ssl_verify_mode = nil
      @ssl_ca_file = nil
      @ssl_client_cert = nil
      @ssl_client_key = nil
      @middlewares = []
      @request_middlewares = []
      @response_middlewares = []
      @timeout = 60
      @debugging = false
      @logger = Object.const_defined?(:Rails) ? Rails.logger : Logger.new(STDOUT)

      yield(self) if block_given?
    end

    # The default Configuration object.
    def self.default
      @@default ||= Configuration.new
    end

    def configure
      yield(self) if block_given?
    end

    def scheme=(scheme)
      # remove :// from scheme
      @scheme = scheme.sub(/:\/\//, '')
    end

    def host=(host)
      # remove http(s):// and anything after a slash
      @host = host.sub(/https?:\/\//, '').split('/').first
    end

    def base_path=(base_path)
      # Add leading and trailing slashes to base_path
      @base_path = "/#{base_path}".gsub(/\/+/, '/')
      @base_path = '' if @base_path == '/'
    end

    # Returns base URL
    def base_url
      "#{scheme}://#{[host, base_path].join('/').gsub(/\/+/, '/')}".sub(/\/+\z/, '')
    end

    def debugging
      return @debugging if @debugging == true
      ENV['MINATO_RUBY_API_CLIENT_DEBUG'] == 'true'
    end

    # Gets API key (with prefix if set).
    # @param [String] param_name the parameter name of API key auth
    def api_key_with_prefix(param_name, param_alias = nil)
      key = @api_key[param_name]
      key = @api_key.fetch(param_alias, key) unless param_alias.nil?
      if @api_key_prefix[param_name]
        "#{@api_key_prefix[param_name]} #{key}"
      else
        key
      end
    end

    # Gets Basic Auth token string
    def basic_auth_token
      'Basic ' + ["#{username}:#{password}"].pack('m').delete("\r\n")
    end

    # Returns Auth Settings hash for api client.
    def auth_settings
      auth_settings = {
        'bearer_auth' =>
          {
            type: 'bearer',
            in: 'header',
            key: 'Authorization',
            value: "Bearer #{access_token}"
          },
        'basic_auth' =>
          {
            type: 'basic',
            in: 'header',
            key: 'Authorization',
            value: basic_auth_token
          },
      }

      api_key.each do |k, v|
        auth_settings['apikey'] = {
          type: 'apikey',
          in: 'header',
          key: k,
          value: api_key_with_prefix(k)
        }
      end

      auth_settings
    end

    # Adds middleware to the stack
    def use(*middleware)
      @middlewares << middleware
    end

    # Adds request middleware to the stack
    def request(*middleware)
      @request_middlewares << middleware
    end

    # Adds response middleware to the stack
    def response(*middleware)
      @response_middlewares << middleware
    end

    # Set up middleware on the connection
    def configure_middleware(connection)
      @middlewares.each do |middleware|
        connection.use(*middleware)
      end

      @request_middlewares.each do |middleware|
        connection.request(*middleware)
      end

      @response_middlewares.each do |middleware|
        connection.response(*middleware)
      end
    end
  end
end