module ZuoraConnect::Controllers::Helpers

def authenticate_app_api_request
  #Skip session for api requests
  Thread.current[:appinstance] = nil
  request.session_options[:skip] = true
  ElasticAPM.set_tag(:trace_id, request.uuid) if defined?(ElasticAPM) && ElasticAPM.running?
  start_time = Time.now
  if request.headers["API-Token"].present?
    @appinstance = ZuoraConnect::AppInstance.where(:api_token => request.headers["API-Token"]).first
    ZuoraConnect.logger.debug("[#{@appinstance.id}] API REQUEST - API token") if @appinstance.present?
    check_instance
  elsif ZuoraConnect::AppInstance::INTERNAL_HOSTS.include?(request.headers.fetch("HOST", nil))
    zuora_host, zuora_entity_id, zuora_instance_id = [request.headers['zuora-host'], (request.headers['zuora-entity-ids'] || "").gsub('-',''), request.headers['zuora-instance-id']]
    #Validate host present
    if zuora_host.blank?
      render json: {"status": 401, "message": "zuora-host header was not supplied."}, status: :unauthorized
      return
    end
    #Validate entity-ids present
    if zuora_entity_id.blank?
      render json: {"status": 401, "message": "zuora-entity-ids header was not supplied."}, status: :unauthorized
      return
    end
    #Select with instance id if present. Used where mulitple deployments are done.
    if zuora_instance_id.present?
      appinstances = ZuoraConnect::AppInstance.where("zuora_entity_ids ?& array[:entities] = true AND zuora_domain = :host AND id = :id", entities: [zuora_entity_id], host: zuora_host, id: zuora_instance_id)
    else
      appinstances = ZuoraConnect::AppInstance.where("zuora_entity_ids ?& array[:entities] = true AND zuora_domain = :host", entities: [zuora_entity_id], host: zuora_host)
    end
    if appinstances.size == 0
      render json: {"status": 401, "message": "Missing mapping or no deployment for '#{zuora_host}-#{zuora_entity_id}' ."}, status: :unauthorized
      return
    elsif appinstances.size > 1
      render json: {"status": 401, "message": "More than one app instance binded to host and entity ids. Please indicate correct instance via 'zuora-instance-id' header"}, status: :unauthorized
      return
    else
      @appinstance = appinstances.first
      check_instance
    end

  elsif request.headers.fetch("Authorization", "").include?("Basic ")
    authenticate_or_request_with_http_basic do |username, password|
      @appinstance = ZuoraConnect::AppInstance.where(:token => password).first
      @appinstance ||= ZuoraConnect::AppInstance.where(:api_token => password).first
      ZuoraConnect.logger.debug("[#{@appinstance.id}] API REQUEST - Basic Auth") if @appinstance.present?
      check_instance
    end
  else
    check_instance
  end
  
  if @appinstance.present?
    ZuoraConnect.logger.debug("[#{@appinstance.id}] Authenticate App API Request Completed In - #{(Time.now - start_time).round(2)}s")
  end
end

def authenticate_connect_app_request
  ElasticAPM.set_tag(:trace_id, request.uuid) if defined?(ElasticAPM) && ElasticAPM.running?
  Thread.current[:appinstance] = nil
  start_time = Time.now
  if ZuoraConnect.configuration.mode == "Production"
    zuora_entity_id = request.headers['ZuoraCurrentEntity'] || cookies['ZuoraCurrentEntity']
    if zuora_entity_id.present?
      zuora_host = request.headers["HTTP_X_FORWARDED_HOST"] || "apisandbox.zuora.com"
      begin
        #Do we need to refresh session identity
        if request.headers["Zuora-Auth-Token"].present?
          zuora_client = ZuoraAPI::Oauth.new(url: "https://#{zuora_host}", bearer_token: request.headers["Zuora-Auth-Token"], oauth_session_expires_at: Time.now + 5.minutes )
        elsif cookies['ZSession'].present?
          zuora_client = ZuoraAPI::Basic.new(url: "https://#{zuora_host}", session: cookies['ZSession'])
        else
          render "zuora_connect/static/error_handled", :locals => {
            :title => "Missing Authorization Token", 
            :message => "Zuora 'Zuora-Auth-Token' header and 'ZSession' cookie not present."
          }
          return
        end
        zuora_instance_id = params[:sidebar_launch].to_bool ? nil : (params[:app_instance_id] || session["appInstance"])
        #Identity blank or current entity different
        if (session["ZuoraCurrentIdentity"].blank? || (session["ZuoraCurrentEntity"] != zuora_entity_id) || (session["ZSession"] != cookies['ZSession']))
          identity, response = zuora_client.rest_call(url: zuora_client.rest_endpoint("identity"))
          session["ZuoraCurrentIdentity"] = identity
          session["ZuoraCurrentEntity"] = identity['entityId']
          session["ZSession"] = cookies['ZSession']
          zuora_instance_id = nil
          client_describe, response = zuora_client.rest_call(url: zuora_client.rest_endpoint("genesis/user/info").gsub('v1/', ''), session_type: zuora_client.class == ZuoraAPI::Oauth ? :bearer : :basic, headers: zuora_client.class == ZuoraAPI::Oauth ? {} : {'Authorization' => "ZSession-a3N2w #{zuora_client.get_session(prefix: false, auth_type: :basic)}"})
          session["ZuoraCurrentUserInfo"] = client_describe
        
          raise ZuoraConnect::Exceptions::Error.new("Header entity id, '#{zuora_entity_id}' does not match identity call entity id, '#{identity['entityId']}'.") if zuora_entity_id != identity['entityId']
        end
        #Find matching app instances.
        if zuora_instance_id.present?
          appinstances = ZuoraConnect::AppInstance.where("zuora_entity_ids ?& array[:entities] = true AND zuora_domain = :host AND id = :id", entities: [zuora_entity_id], host: zuora_client.rest_domain, id: zuora_instance_id).pluck(:id, :name)
        else
          #if app_instance_ids is present then permissions still controlled by connect
          if params[:app_instance_ids].present? 
            navbar, response = zuora_client.rest_call(url: zuora_client.rest_endpoint("navigation"))
            urls = navbar['menus'].map {|x| x['url']}
            app_env = ENV["DEIS_APP"] || "xyz123"
            url = urls.compact.select {|url| File.basename(url).start_with?(app_env + '?')}.first
            task_ids = JSON.parse(Base64.urlsafe_decode64(CGI.parse(URI.parse(url).query)["app_instance_ids"][0]))
            
            appinstances = ZuoraConnect::AppInstance.where(:id => task_ids).pluck(:id, :name)
          else
            appinstances = ZuoraConnect::AppInstance.where("zuora_entity_ids ?& array[:entities] = true AND zuora_domain = :host", entities: [zuora_entity_id], host: zuora_client.rest_domain).pluck(:id, :name)
          end
        end
        zuora_user_id = cookies['Zuora-User-Id'] || session["ZuoraCurrentIdentity"]['userId']
        #One deployed instance
        if appinstances.size == 1
          ZuoraConnect.logger.debug("Instance is #{appinstances.to_h.keys.first}")
          @appinstance = ZuoraConnect::AppInstance.find(appinstances.to_h.keys.first)
          #Add user/update 
          @zuora_user = ZuoraConnect::ZuoraUser.where(:zuora_user_id => zuora_user_id).first
          if @zuora_user.present?
            ZuoraConnect.logger.debug("Current zuora user #{zuora_user_id}")
            if @zuora_user.updated_at < Time.now - 1.day
              @zuora_user.zuora_identity_response[zuora_entity_id] = session["ZuoraCurrentIdentity"]
              @zuora_user.save!
            end
          else
            ZuoraConnect.logger.debug("New zuora user object for #{zuora_user_id}")
            @zuora_user = ZuoraConnect::ZuoraUser.create!(:zuora_user_id => zuora_user_id, :zuora_identity_response => {zuora_entity_id => session["ZuoraCurrentIdentity"]})
          end 
          @zuora_user.session = session
          session["#{@appinstance.id}::user::email"] = session['ZuoraCurrentIdentity']["username"]
          session["#{@appinstance.id}::user::timezone"] = session['ZuoraCurrentIdentity']["timeZone"]
          session["#{@appinstance.id}::user::locale"] = session['ZuoraCurrentIdentity']["language"]
          session["appInstance"] = @appinstance.id
        #We have multiple, user must pick
        elsif appinstances.size > 1 
          ZuoraConnect.logger.debug("User must select instance. #{@names}")
          render "zuora_connect/static/launch", :locals => {:names => appinstances.to_h}
          return
        #We have no deployed instance for this tenant
        else 
          #Ensure user can access oauth creation API 
          if session["ZuoraCurrentIdentity"]['platformRole'] != 'ADMIN' 
            Thread.current[:appinstance] = nil
            session["appInstance"] = nil
            render "zuora_connect/static/error_handled", :locals => {
              :title => "Application can only complete its initial setup via platform administrator", 
              :message => "Please contact admin of tenant and have them click on link again to launch application."
            }
            return
          end
          Apartment::Tenant.switch!("public")
          ActiveRecord::Base.transaction do
            ActiveRecord::Base.connection.execute('LOCK public.zuora_users IN ACCESS EXCLUSIVE MODE')
            appinstances = ZuoraConnect::AppInstance.where("zuora_entity_ids ?& array[:entities] = true AND zuora_domain = :host", entities: [zuora_entity_id], host: zuora_client.rest_domain).pluck(:id, :name)
            if appinstances.size > 0
              redirect_to "https://#{zuora_host}/apps/newlogin.do?retURL=#{request.fullpath}"
              return
            end
            next_id = (ZuoraConnect::AppInstance.all.where('id > 24999999').order(id: :desc).limit(1).pluck(:id).first || 24999999) + 1
            user = (ENV['DEIS_APP'] || "Application").split('-').map(&:capitalize).join(' ')
            body = {
              'userId' => zuora_user_id, 
              'entityIds' => [zuora_entity_id.unpack("a8a4a4a4a12").join('-')], 
              'customAuthorities' => [], 
              'additionalInformation' => {
                'description' => "This user is for #{user} application.", 
                'name' => "#{user} API User #{next_id}"
              }
            }
            oauth_response, response = zuora_client.rest_call(method: :post, body: body.to_json, url: zuora_client.rest_endpoint("genesis/clients").gsub('v1/', ''), session_type: zuora_client.class == ZuoraAPI::Oauth ? :bearer : :basic, headers: zuora_client.class == ZuoraAPI::Oauth ? {} : {'Authorization' => "ZSession-a3N2w #{zuora_client.get_session(prefix: false, auth_type: :basic)}"})
            new_zuora_client = ZuoraAPI::Oauth.new(url: "https://#{zuora_host}", oauth_client_id: oauth_response["clientId"], oauth_secret: oauth_response["clientSecret"] )
            if session["ZuoraCurrentUserInfo"].blank?
              client_describe, response = new_zuora_client.rest_call(url: zuora_client.rest_endpoint("genesis/user/info").gsub('v1/', ''), session_type: :bearer)
            else
              client_describe = session["ZuoraCurrentUserInfo"]
            end
            available_entities = client_describe["accessibleEntities"].select {|entity| entity['id'] == client_describe['defaultEntityId']}
            task_data = {
              "id": next_id,
              "name": client_describe["tenantName"],
              "mode": "Collections",
              "status": "Running",
              ZuoraConnect::AppInstance::LOGIN_TENANT_DESTINATION => {
                "tenant_type": "Zuora",
                "username": session["ZuoraCurrentIdentity"]["username"],
                "url": new_zuora_client.url,
                "status": "Active",
                "oauth_client_id": oauth_response['clientId'],
                "oauth_secret": oauth_response['clientSecret'],
                "authentication_type": "OAUTH",
                "entities": available_entities.map {|e| e.merge({'displayName' => client_describe["tenantName"]})}
              },
              "tenant_ids": available_entities.map{|e| e['entityId'] }.push(client_describe["tenantId"]).uniq,
            }
            mapped_values = {:id => next_id, :api_token => rand(36**64).to_s(36), :token => rand(36**64).to_s(36), :zuora_logins => task_data, :oauth_expires_at => Time.now + 1000.years, :zuora_domain => zuora_client.rest_domain, :zuora_entity_ids => [zuora_entity_id]}
            @appinstance = ZuoraConnect::AppInstance.new(mapped_values)
            retry_count = 0
            begin
              @appinstance.save(:validate => false)
            rescue ActiveRecord::RecordNotUnique => ex
              if (retry_count += 1) < 3
                @appinstance.assign_attributes({:api_token => rand(36**64).to_s(36), :token => rand(36**64).to_s(36)})
                retry
              else
                Thread.current[:appinstance] = nil
                session["appInstance"] = nil
                render "zuora_connect/static/error_handled", :locals => {
                  :title => "Application could not create unique tokens.", 
                  :message => "Please contact support or retry launching application."
                }
                return
              end
            end
          end
          Apartment::Tenant.switch!("public")
          begin
            Apartment::Tenant.create(@appinstance.id.to_s)
          rescue Apartment::TenantExists => ex
            ZuoraConnect.logger.debug("Tenant Already Exists")
          end
          @appinstance.refresh
          session["appInstance"] = @appinstance.id
        end
      rescue ZuoraAPI::Exceptions::ZuoraAPIAuthenticationTypeError => ex
        session.clear
        redirect_to "https://#{zuora_host}/apps/newlogin.do?retURL=#{request.fullpath}"
        return
      rescue => ex
        ZuoraConnect.logger.error(ex)
        render "zuora_connect/static/error_unhandled", :locals => {:exception => ex}
        return              
      end
    elsif request["data"] && /^([A-Za-z0-9+\/\-\_]{4})*([A-Za-z0-9+\/]{4}|[A-Za-z0-9+\/]{3}=|[A-Za-z0-9+\/]{2}==)$/.match(request["data"].to_s)
      setup_instance_via_data
    else
      if session["appInstance"].present?
        @appinstance = ZuoraConnect::AppInstance.where(:id => session["appInstance"]).first 
      else
        render "zuora_connect/static/error_handled", :locals => {
          :title => "Application state could not be verified", 
          :message => "Please relaunch application."
        }
        return 
      end
    end
  else
    setup_instance_via_dev_mode
  end
  if !defined?(@appinstance) || @appinstance.blank?
    render "zuora_connect/static/error_handled", :locals => {
      :title => "Application state could not be found.", 
      :message => "Please relaunch application."
    }
    return 
  end
  #Call .data_lookup with the current session to retrieve session. In some cases session may be stored/cache in redis 
  #so data lookup provides a model method that can be overriden per app.
  if params[:controller] != 'zuora_connect/api/v1/app_instance' && params[:action] != 'drop'
    if @appinstance.new_session_for_ui_requests(:params => params)
      @appinstance.new_session(:session => @appinstance.data_lookup(:session => session))
    end
  end
  if session["#{@appinstance.id}::user::email"].present? 
    ElasticAPM.set_user(session["#{@appinstance.id}::user::email"])  if defined?(ElasticAPM) && ElasticAPM.running?
    PaperTrail.whodunnit =  session["#{@appinstance.id}::user::email"] if defined?(PaperTrail)
  end
  begin
    locale = session["#{@appinstance.id}::user::locale"]
    I18n.locale = locale.present? ? locale : @appinstance.locale
  rescue I18n::InvalidLocale => ex
    ZuoraConnect.logger.error(ex) if !ZuoraConnect::AppInstance::IGNORED_LOCALS.include?(ex.locale.to_s.downcase)
  end
  begin
    Time.zone = session["#{@appinstance.id}::user::timezone"] ? session["#{@appinstance.id}::user::timezone"] : @appinstance.timezone
  rescue 
    ZuoraConnect.logger.error(ex) 
  end
  ZuoraConnect.logger.debug("[#{@appinstance.blank? ? "N/A" : @appinstance.id}] Authenticate App Request Completed In - #{(Time.now - start_time).round(2)}s")
end

def check_connect_admin
  return session["#{@appinstance.id}::admin"]
end

def check_connect_admin!
  raise ZuoraConnect::Exceptions::AccessDenied.new("User is not an authorized admin for this application") if !session["#{@appinstance.id}::admin"]
end

def check_instance
  if defined?(@appinstance) && @appinstance.present?
    if @appinstance.new_session_for_api_requests(:params => params)
      @appinstance.new_session(:session => @appinstance.data_lookup(:session => session))
    end
    Thread.current[:appinstance] = @appinstance
    PaperTrail.whodunnit = "API User" if defined?(PaperTrail)
    ElasticAPM.set_user("API User")  if defined?(ElasticAPM) && ElasticAPM.running?
    return true
  else
    response.set_header('WWW-Authenticate', "Basic realm=\"Application\"")
    render json: {"status": 401, "message": "Access Denied"}, status: :unauthorized
    return false
  end
end

def hallway_integration?
  return (request.headers['ZuoraCurrentEntity'].present? || cookies['ZuoraCurrentEntity'].present?)
end

def persist_connect_app_session
  if @appinstance.present?
    if defined?(Redis.current)
      @appinstance.cache_app_instance
    else
      session.merge!(@appinstance.save_data)
    end
  end
end

def setup_instance_via_data
  session.clear
  values = JSON.parse(ZuoraConnect::AppInstance.decrypt_response(Base64.urlsafe_decode64(request["data"])))
  if values["param_data"]
    values["param_data"].each do |k ,v|
      params[k] = v
    end
  end
  session["#{values["appInstance"]}::destroy"] = values["destroy"]
  session["appInstance"] = values["appInstance"]
  if values["current_user"]
    session["#{values["appInstance"]}::admin"] = values["current_user"]["admin"] ? values["current_user"]["admin"] : false
    session["#{values["appInstance"]}::user::timezone"] = values["current_user"]["timezone"]
    session["#{values["appInstance"]}::user::locale"] = values["current_user"]["locale"]
    session["#{values["appInstance"]}::user::email"] = values["current_user"]["email"]
  end
  ZuoraConnect.logger.debug({msg: 'Setup values', connect: values}) if Rails.env != "production"
  @appinstance = ZuoraConnect::AppInstance.where(:id => values["appInstance"].to_i).first
  if @appinstance.blank?
    Apartment::Tenant.switch!("public")
    begin
      Apartment::Tenant.create(values["appInstance"].to_s)
    rescue Apartment::TenantExists => ex
      ZuoraConnect.logger.debug("Tenant Already Exists")
    end
    mapped_values = {:api_token => values['api_token'], :token => values['api_token'], :access_token => values["access_token"], :refresh_token => values["refresh_token"], :oauth_expires_at => values["expires"]}
    @appinstance = ZuoraConnect::AppInstance.new(mapped_values.merge({:id => values["appInstance"].to_i}))
    @appinstance.save(:validate => false)
  else
    mapped_values = {:access_token => values["access_token"], :refresh_token => values["refresh_token"], :oauth_expires_at => values["expires"]}
    @appinstance.assign_attributes(mapped_values)
    if @appinstance.access_token_changed? && @appinstance.refresh_token_changed?
      @appinstance.save(:validate => false)
    else
      raise ZuoraConnect::Exceptions::AccessDenied.new("Authorization mistmatch. Possible tampering")
    end
  end     
end

def setup_instance_via_dev_mode
  session["appInstance"] = ZuoraConnect.configuration.dev_mode_appinstance
  user = ZuoraConnect.configuration.dev_mode_user
  key = ZuoraConnect.configuration.dev_mode_pass
  values = {:user => user , :key => key, :appinstance => session["appInstance"]}
  @appinstance = ZuoraConnect::AppInstance.where(:id => values[:appinstance].to_i).first
  if @appinstance.blank?
    Apartment::Tenant.switch!("public")
    begin
      Apartment::Tenant.create(values[:appinstance].to_s)
    rescue Apartment::TenantExists => ex
      Apartment::Tenant.drop(values[:appinstance].to_s)
      retry
    end
    @appinstance = ZuoraConnect::AppInstance.new(:id => values[:appinstance].to_i, :access_token => values[:user], :refresh_token => values[:key], :token => "#{values[:key]}#{values[:key]}", :api_token => "#{values[:key]}#{values[:key]}")
    @appinstance.save(:validate => false)
  end
  if @appinstance.access_token.blank? || @appinstance.refresh_token.blank? || @appinstance.token.blank? || @appinstance.api_token.blank?
    @appinstance.update_attributes!(:access_token =>  values["user"], :refresh_token =>  values["key"], :token => "#{values[:key]}#{values[:key]}", :api_token => "#{values[:key]}#{values[:key]}")
  end
  session["#{@appinstance.id}::admin"] =  ZuoraConnect.configuration.dev_mode_admin
end

def zuora_user
  return @zuora_user
end