require "mvx_auth_client/version"
require 'jwt'

module MvxAuthClient
  class Error < StandardError; end
  
  @@auth_pub_key = nil
  AUTH_URL = (ENV['AUTH_URL'] || 'http://10.109.182.207:3030')

  class << self
    def request_token(login, password)
      json = {:login => login, :password => password }
      create_connection(AUTH_URL, '/login')
      res = send_request(json)
      token = JSON.parse(res.body)['login_token']
      if token.blank?
        return nil
      end
      user_info = decrypt_token_full(token)
      if user_info.blank?
        return nil
      end
      opcode = user_info[:opcode]
      warehouseId = user_info[:warehouses].keys.first.to_s

      new_token_request = { warehouseId: warehouseId }.to_json
      cookie = 'Bearer ' + token
      uri = URI.parse(AUTH_URL + "/get_tokens")
      http = Net::HTTP.new(uri.host,uri.port, nil)
      req = Net::HTTP::Post.new(uri.path, initheader = {'Content-Type' =>'application/json'})
      req['Authorization'] = cookie
      req.body = new_token_request
      res = http.request(req)
      json_reply_hash = JSON.parse(res.body)
      json_reply_hash[:opcode] = opcode
      return json_reply_hash
    end

    def decrypt_token_full(token, repeat_get_key = true)
      key = get_key(AUTH_URL, '/public_rsa')
      rsa_public  = OpenSSL::PKey::RSA.new(key)
      begin
        return JWT.decode(token, rsa_public, true, algorithms: 'RS256').first.symbolize_keys
      rescue JWT::VerificationError => e
        if repeat_get_key
          @@auth_pub_key = nil
          return decrypt_token_full(token, false)
        else
          raise e
        end
      end
      return decoded
    end

  private 

    def create_connection(env, method)
      url = ENV[env] || env
      url_method = url + method
      uri = URI.parse(url_method)
      @http = Net::HTTP.new(uri.host, uri.port, nil) #No proxy!
      @req = Net::HTTP::Post.new(uri.path, 'Content-Type' => 'application/json')
    end

    def send_request(body)
      # begin
        @req.body = body.to_json
        @http.request(@req)
      # rescue Exception => e
        # render json: {error: "Unauthorized"}.to_json, status: 401
      # end
    end

    def get_key(env, method)
      if @@auth_pub_key.nil?
        uri = URI((ENV[env] || env) + method)
        http = Net::HTTP.new(uri.host, uri.port, nil)
        req = Net::HTTP::Get.new(uri.path, 'Content-Type' => 'application/json')
        response = http.request(req)
        body = response.body
        res = JSON.parse(body)
        @@auth_pub_key = res['public_rsa']
      end
      @@auth_pub_key
    end

    def get_tokens(body, cookies)
      json = JSON.parse(body)
      companyId = json['companyId']
      custCompanyId = json['custCompanyId']
      warehouseId = json['warehouseId']
      cookies['Authorization'] = cookies
      create_connection(method)
      resp = send_request({companyId: companyId, custCompanyId: custCompanyId, warehouseId: warehouseId}.to_json)
      return resp.body
    end
  end
end