require 'twitter/error'
require 'twitter/utils'
require 'twitter/version'

module Twitter
  class Client
    include Twitter::Utils
    attr_accessor :access_token, :access_token_secret, :consumer_key, :consumer_secret, :proxy
    attr_writer :user_agent
    deprecate_alias :oauth_token, :access_token
    deprecate_alias :oauth_token=, :access_token=
    deprecate_alias :oauth_token_secret, :access_token_secret
    deprecate_alias :oauth_token_secret=, :access_token_secret=

    # Initializes a new Client object
    #
    # @param options [Hash]
    # @return [Twitter::Client]
    def initialize(options = {})
      options.each do |key, value|
        instance_variable_set("@#{key}", value)
      end
      yield(self) if block_given?
      validate_credentials!
    end

    # @return [Boolean]
    def user_token?
      !!(access_token && access_token_secret)
    end

    # @return [String]
    def user_agent
      @user_agent ||= "TwitterRubyGem/#{Twitter::Version}"
    end

    # @return [Hash]
    def credentials
      {
        consumer_key: consumer_key,
        consumer_secret: consumer_secret,
        token: access_token,
        token_secret: access_token_secret,
        ignore_extra_keys: true,
      }
    end

    # @return [Boolean]
    def credentials?
      credentials.values.all?
    end

  private

    # Ensures that all credentials set during configuration are of a
    # valid type. Valid types are String and Boolean.
    #
    # @raise [Twitter::Error::ConfigurationError] Error is raised when
    #   supplied twitter credentials are not a String or Boolean.
    def validate_credentials!
      credentials.each do |credential, value|
        next if value.nil? || value == true || value == false || value.is_a?(String)
        raise(Twitter::Error::ConfigurationError.new("Invalid #{credential} specified: #{value.inspect} must be a String."))
      end
    end
  end
end