module HTTParty
  class Request #:nodoc:
    SupportedHTTPMethods = [
      Net::HTTP::Get,
      Net::HTTP::Post,
      Net::HTTP::Patch,
      Net::HTTP::Put,
      Net::HTTP::Delete,
      Net::HTTP::Head,
      Net::HTTP::Options
    ]

    SupportedURISchemes  = [URI::HTTP, URI::HTTPS]

    NON_RAILS_QUERY_STRING_NORMALIZER = Proc.new do |query|
      Array(query).map do |key, value|
        if value.nil?
          key.to_s
        elsif value.is_a?(Array)
          value.map {|v| "#{key}=#{URI.encode(v.to_s, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]"))}"}
        else
          HashConversions.to_params(key => value)
        end
      end.flatten.sort.join('&')
    end

    attr_accessor :http_method, :path, :options, :last_response, :redirect, :last_uri

    def initialize(http_method, path, o={})
      self.http_method = http_method
      self.path = path
      self.options = {
        :limit => o.delete(:no_follow) ? 1 : 5,
        :default_params => {},
        :follow_redirects => true,
        :parser => Parser,
        :connection_adapter => ConnectionAdapter
      }.merge(o)
    end

    def path=(uri)
      @path = URI.parse(uri)
    end

    def uri
      new_uri = path.relative? ? URI.parse("#{base_uri}#{path}") : path

      # avoid double query string on redirects [#12]
      unless redirect
        new_uri.query = query_string(new_uri)
      end

      unless SupportedURISchemes.include? new_uri.class
        raise UnsupportedURIScheme, "'#{new_uri}' Must be HTTP or HTTPS"
      end

      @last_uri = new_uri
    end

    def base_uri
      redirect ? "#{@last_uri.scheme}://#{@last_uri.host}" : options[:base_uri]
    end

    def format
      options[:format] || (format_from_mimetype(last_response['content-type']) if last_response)
    end

    def parser
      options[:parser]
    end

    def connection_adapter
      options[:connection_adapter]
    end

    def perform(&block)
      validate
      setup_raw_request
      chunked_body = nil

      self.last_response = http.request(@raw_request) do |http_response|
        if block
          chunks = []

          http_response.read_body do |fragment|
            chunks << fragment
            block.call(fragment)
          end

          chunked_body = chunks.join
        end
      end

      handle_deflation
      handle_response(chunked_body)
    end

    private

    def http
      connection_adapter.call(uri, options)
    end

    def body
      options[:body].is_a?(Hash) ? normalize_query(options[:body]) : options[:body]
    end

    def credentials
      options[:basic_auth] || options[:digest_auth]
    end

    def username
      credentials[:username]
    end

    def password
      credentials[:password]
    end

    def normalize_query(query)
      if query_string_normalizer
        query_string_normalizer.call(query)
      else
        HashConversions.to_params(query)
      end
    end

    def query_string_normalizer
      options[:query_string_normalizer]
    end

    def setup_raw_request
      @raw_request = http_method.new(uri.request_uri)
      @raw_request.body = body if body
      @raw_request.initialize_http_header(options[:headers])
      @raw_request.basic_auth(username, password) if options[:basic_auth]
      setup_digest_auth if options[:digest_auth]
    end

    def setup_digest_auth
      auth_request = http_method.new(uri.request_uri)
      auth_request.initialize_http_header(options[:headers])
      res = http.request(auth_request)

      if res['www-authenticate'] != nil && res['www-authenticate'].length > 0
        @raw_request.digest_auth(username, password, res)
      end
    end

    def query_string(uri)
      query_string_parts = []
      query_string_parts << uri.query unless uri.query.nil?

      if options[:query].is_a?(Hash)
        query_string_parts << normalize_query(options[:default_params].merge(options[:query]))
      else
        query_string_parts << normalize_query(options[:default_params]) unless options[:default_params].empty?
        query_string_parts << options[:query] unless options[:query].nil?
      end

      query_string_parts.size > 0 ? query_string_parts.join('&') : nil
    end

    def handle_response(body)
      if response_redirects?
        options[:limit] -= 1
        self.path = last_response['location']
        self.redirect = true
        self.http_method = Net::HTTP::Get unless options[:maintain_method_across_redirects]
        capture_cookies(last_response)
        perform
      else
        body = body || last_response.body
        Response.new(self, last_response, lambda { parse_response(body) }, :body => body)
      end
    end

    # Inspired by Ruby 1.9
    def handle_deflation
      case last_response["content-encoding"]
      when "gzip", "x-gzip"
        body_io = StringIO.new(last_response.body)
        last_response.body.replace Zlib::GzipReader.new(body_io).read
        last_response.delete('content-encoding')
      when "deflate"
        last_response.body.replace Zlib::Inflate.inflate(last_response.body)
        last_response.delete('content-encoding')
      end
    end

    def response_redirects?
      case last_response
      when Net::HTTPMultipleChoice, # 300
           Net::HTTPMovedPermanently, # 301
           Net::HTTPFound, # 302
           Net::HTTPSeeOther, # 303
           Net::HTTPUseProxy, # 305
           Net::HTTPTemporaryRedirect
        options[:follow_redirects] && last_response.key?('location')
      end
    end

    def parse_response(body)
      parser.call(body, format)
    end

    def capture_cookies(response)
      return unless response['Set-Cookie']
      cookies_hash = HTTParty::CookieHash.new()
      cookies_hash.add_cookies(options[:headers]['Cookie']) if options[:headers] && options[:headers]['Cookie']
      cookies_hash.add_cookies(response['Set-Cookie'])
      options[:headers] ||= {}
      options[:headers]['Cookie'] = cookies_hash.to_cookie_string
    end

    # Uses the HTTP Content-Type header to determine the format of the
    # response It compares the MIME type returned to the types stored in the
    # SupportedFormats hash
    def format_from_mimetype(mimetype)
      if mimetype && parser.respond_to?(:format_from_mimetype)
        parser.format_from_mimetype(mimetype)
      end
    end

    def validate
      raise HTTParty::RedirectionTooDeep.new(last_response), 'HTTP redirects too deep' if options[:limit].to_i <= 0
      raise ArgumentError, 'only get, post, patch, put, delete, head, and options methods are supported' unless SupportedHTTPMethods.include?(http_method)
      raise ArgumentError, ':headers must be a hash' if options[:headers] && !options[:headers].is_a?(Hash)
      raise ArgumentError, 'only one authentication method, :basic_auth or :digest_auth may be used at a time' if options[:basic_auth] && options[:digest_auth]
      raise ArgumentError, ':basic_auth must be a hash' if options[:basic_auth] && !options[:basic_auth].is_a?(Hash)
      raise ArgumentError, ':digest_auth must be a hash' if options[:digest_auth] && !options[:digest_auth].is_a?(Hash)
      raise ArgumentError, ':query must be hash if using HTTP Post' if post? && !options[:query].nil? && !options[:query].is_a?(Hash)
    end

    def post?
      Net::HTTP::Post == http_method
    end
  end
end