require 'net/https'
require 'openssl'
require 'json'
require 'uri'

module CRP
  class ReviewPoster
    NEW_REVIEW_PATH         = "/api/v1/Review/newReview"
    USERNAME_REVIEW_CODE    = 1
    DESCRIPTION_REVIEW_CODE = 2
    IMAGE_REVIEW_CODE       = 3

    def initialize(host = ENV['CRP_HOST'], client = ENV['CRP_CLIENT'], key = ENV['CRP_KEY'])
      raise ArgumentError, "Missing CRP host"   if host.nil?   || host.strip.empty?
      raise ArgumentError, "Missing CRP client" if client.nil? || client.strip.empty?
      raise ArgumentError, "Missing CRP key"    if key.nil?    || key.strip.empty?
      @host   = host
      @client = client
      @key    = key
    end

    # Submits a new username review to CRP.
    def new_username_review(internal_review_id, gender, username, age)
      new_review(USERNAME_REVIEW_CODE, username, internal_review_id, gender, username, age)
    end

    # Submits a new description review to CRP.
    def new_description_review(description, internal_review_id, gender, username, age)
      new_review(DESCRIPTION_REVIEW_CODE, description, internal_review_id, gender, username, age)
    end

    # Submits a new image review to CRP.
    def new_image_review(image_url, internal_review_id, gender, username, age)
      new_review(IMAGE_REVIEW_CODE, image_url, internal_review_id, gender, username, age)
    end

    # Submits a new review to CRP.
    def new_review(review_type, review_content, internal_review_id, gender, username, age)
      uri              = new_review_url(review_type, review_content, internal_review_id, gender, username, age)
      http             = Net::HTTP.new(uri.host, uri.port)
      http.use_ssl     = true
      http.verify_mode = OpenSSL::SSL::VERIFY_NONE # Host certificate does not cover the subdomain
      request          = Net::HTTP::Get.new(uri.request_uri)
      response         = http.request(request)
      ReviewResponse.new(response)
    end

    # Builds a new URL needed to submit a profile review to CRP.
    def new_review_url(review_type, review_content, internal_review_id, gender, username, age)
      arguments = [{
                    reviewType:       review_type,
                    reviewContent:    review_content,
                    internalReviewId: internal_review_id,
                    gender:           GenderMapper.to_code(gender),
                    username:         username,
                    age:              age
                  }].to_json
      signature = sign_arguments(arguments)
      query     = URI.encode_www_form(client: @client, arguments: arguments, signature: signature)
      URI::HTTPS.build({host: @host, path: NEW_REVIEW_PATH, query: query})
    end

    private

    def sign_arguments(arguments)
      digest = OpenSSL::Digest::Digest.new("sha1")
      OpenSSL::HMAC.hexdigest(digest, @key, arguments)
    end
  end
end