class Faraday::Connection

def authorization(type, token)
  set_authorization_header(:authorization, type, token)
end

def basic_auth(login, pass)
  set_authorization_header(:basic_auth, login, pass)
end

def build_exclusive_url(url = nil, params = nil, params_encoder = nil)
  url = nil if url.respond_to?(:empty?) and url.empty?
  base = url_prefix
  if url and base.path and base.path !~ /\/$/
    base = base.dup
    base.path = base.path + '/'  # ensure trailing slash
  end
  uri = url ? base + url : base
  uri.query = params.to_query(params_encoder || options.params_encoder) if params
  uri.query = nil if uri.query and uri.query.empty?
  uri
end

def build_request(method)
  Request.create(method) do |req|
    req.params  = self.params.dup
    req.headers = self.headers.dup
    req.options = self.options.merge(:proxy => self.proxy)
    yield(req) if block_given?
  end
end

def build_url(url = nil, extra_params = nil)
  uri = build_exclusive_url(url)
  query_values = params.dup.merge_query(uri.query, options.params_encoder)
  query_values.update extra_params if extra_params
  uri.query = query_values.empty? ? nil : query_values.to_query(options.params_encoder)
  uri
end

def default_parallel_manager
  @default_parallel_manager ||= begin
    handler = @builder.handlers.detect do |h|
      h.klass.respond_to?(:supports_parallel?) and h.klass.supports_parallel?
    end
    if handler
      handler.klass.setup_parallel_manager
    elsif block_given?
      yield
    end
  end
end

def dup
  self.class.new(build_exclusive_url,
                 :headers => headers.dup,
                 :params => params.dup,
                 :builder => builder.dup,
                 :ssl => ssl.dup,
                 :request => options.dup)
end

def find_default_proxy
  warn 'no_proxy is unsupported' if ENV['no_proxy'] || ENV['NO_PROXY']
  uri = ENV['http_proxy']
  if uri && !uri.empty?
    uri = 'http://' + uri if uri !~ /^http/i
    uri
  end
end

def headers=(hash)
  @headers.replace hash
end

def in_parallel(manager = nil)
  @parallel_manager = manager || default_parallel_manager {
    warn "Warning: `in_parallel` called but no parallel-capable adapter on Faraday stack"
    warn caller[2,10].join("\n")
    nil
  }
  yield
  @parallel_manager && @parallel_manager.run
ensure
  @parallel_manager = nil
end

def in_parallel?
  !!@parallel_manager
end

def initialize(url = nil, options = nil)
  options = ConnectionOptions.from(options)
  if url.is_a?(Hash)
    options = options.merge(url)
    url     = options.url
  end
  @parallel_manager = nil
  @headers = Utils::Headers.new
  @params  = Utils::ParamsHash.new
  @options = options.request
  @ssl = options.ssl
  @default_parallel_manager = options.parallel_manager
  @builder = options.builder || begin
    # pass an empty block to Builder so it doesn't assume default middleware
    options.new_builder(block_given? ? Proc.new { |b| } : nil)
  end
  self.url_prefix = url || 'http:/'
  @params.update(options.params)   if options.params
  @headers.update(options.headers) if options.headers
  @proxy = nil
  proxy(options.fetch(:proxy) {
    uri = nil
    if URI.parse("").respond_to?(:find_proxy)
      case url
      when String
        uri = URI.parse(url).find_proxy
      when URI
        uri = url.find_proxy
      when nil
        uri = find_default_proxy
      end
    else
      uri = find_default_proxy
    end
    uri
  })
  yield(self) if block_given?
  @headers[:user_agent] ||= "Faraday v#{VERSION}"
end

def params=(hash)
  @params.replace hash
end

def path_prefix=(value)
  url_prefix.path = if value
    value = '/' + value unless value[0,1] == '/'
    value
  end
end

def proxy(arg = nil)
  return @proxy if arg.nil?
  @proxy = ProxyOptions.from(arg)
end

def run_request(method, url, body, headers)
  if !METHODS.include?(method)
    raise ArgumentError, "unknown http method: #{method}"
  end
  request = build_request(method) do |req|
    req.url(url)                if url
    req.headers.update(headers) if headers
    req.body = body             if body
    yield(req) if block_given?
  end
  builder.build_response(self, request)
end

def set_authorization_header(header_type, *args)
  header = Faraday::Request.lookup_middleware(header_type).
    header(*args)
  headers[Faraday::Request::Authorization::KEY] = header
end

def token_auth(token, options = nil)
  set_authorization_header(:token_auth, token, options)
end

def url_prefix=(url, encoder = nil)
  uri = @url_prefix = Utils.URI(url)
  self.path_prefix = uri.path
  params.merge_query(uri.query, encoder)
  uri.query = nil
  with_uri_credentials(uri) do |user, password|
    basic_auth user, password
    uri.user = uri.password = nil
  end
  uri
end

def with_uri_credentials(uri)
  if uri.user and uri.password
    yield(Utils.unescape(uri.user), Utils.unescape(uri.password))
  end
end