/searchengine_query.rb

require 'net/http'
require 'net/https'
require 'json'

class SearchEngine
	attr_reader :searchTerm
	def initialize(strSearch, strGoogleKey)
		@searchTerm = strSearch
		@googleDevKey = strGoogleKey
	end

	def getGoogleQuery()
		return "https://www.google.it/search?&oe=utf8&num=10&q=" + getCleanText(@searchTerm)
	end

	def getGoogleFirstResult()
		return [nil, nil, nil] unless @googleDevKey

		strPage = getPage(getGoogleApiQuery())
		hResult = JSON.parse(strPage)

		strDesc, strLink, strName = nil, nil, nil
		if hResult["items"] != nil && !hResult["items"].empty? then
			strName = hResult["items"].first["title"]
			strLink = hResult["items"].first["link"]
			strDesc = hResult["items"].first["snippet"]
		end
		if strName && strLink && strDesc then
			[strName, strLink, strDesc]
		else
			[nil, nil, nil]
		end
	end

	def getDuckDuckGoQuery()
		return "https://duckduckgo.com/?q=" + getCleanText(@searchTerm)
	end

	def getDuckDuckGoOfficialPage()
		strPage = getPage(getDuckDuckGoApiQuery())
		#puts "Parsing " + getDuckDuckGoApiQuery() + "..."
		hResult = JSON.parse(strPage)
		strDesc, strLink, strName = nil, nil, nil
		if hResult["Results"] != nil && !hResult["Results"].empty? then
			strDesc = hResult["AbstractText"]
			strLink = hResult["Results"].first["FirstURL"]
			strName = hResult["Heading"]
		end
		if strName && strLink && strDesc then
			[strName, strLink, strDesc]
		else
			[nil, nil, nil]
		end
	end

private
	def getDuckDuckGoApiQuery()
		return "https://api.duckduckgo.com/?q=#{getCleanText(@searchTerm)}&format=json&pretty=0"
	end

	def getGoogleApiQuery()
		return "https://www.googleapis.com/customsearch/v1?key=#{@googleDevKey}&q=#{getCleanText(@searchTerm)}&cx=017576662512468239146:omuauf_lfve&num=1&oe=utf8"
	end

	def getCleanText(strText)
		regSpaces = /\s{2,}/
		workString = strText.gsub(regSpaces, " ").strip
		workString.gsub!(" ", "+")
		URI.escape(workString)
	end

	def getPage(strURL)
		uri = URI.parse(strURL)
		http = Net::HTTP.new(uri.host, uri.port)
		if uri.port == 443 then
			http.use_ssl = true
			http.verify_mode = OpenSSL::SSL::VERIFY_NONE
		end
		response = http.get(uri.request_uri)
		response.body.force_encoding("UTF-8")
	end
end