offers/dining/typescript/src/offer_feed.ts

import { 
  Offer, 
  OfferFeed, 
  OfferSource, 
  ActionType, 
  OfferMode, 
  OfferCategory 
} from "./generated/offer"; // Path to your generated types
import { Money } from "./generated/money";
import { DayOfWeek } from "./generated/dayofweek";
import { TimeOfDay } from "./generated/timeofday";
import { Timestamp } from "./generated/google/protobuf/timestamp";
import { Duration } from "./generated/google/protobuf/duration";

// 200 MB Limit
const MAX_BYTES_DATA_FILE = 200 * 1024 * 1024;

function generateOfferFeed() {
  // Build the Offer object
  const offer: Offer = {
    offer_id: "offer-1",
    entity_ids: ["dining-1"],
    offer_source: OfferSource.OFFER_SOURCE_AGGREGATOR,
    action_type: ActionType.ACTION_TYPE_DINING,
    offer_modes: [
      OfferMode.OFFER_MODE_WALK_IN,
      OfferMode.OFFER_MODE_FREE_RESERVATION,
    ],
    offer_category: OfferCategory.OFFER_CATEGORY_BASE_OFFER,
    offer_details: {
      offer_display_text: "₹100 off on your order",
      // Set 'oneof' field: discountValue
      discount_value: {
        currency_code: "INR",
        units: 100,
      },
    },
    offer_restrictions: {
      combinable_with_other_offers: true,
      combinable_offer_categories: [
        OfferCategory.OFFER_CATEGORY_ADD_ON_PAYMENT_OFFER,
        OfferCategory.OFFER_CATEGORY_ADD_ON_COUPON_OFFER,
      ],
    },
    terms: {
      restricted_to_certain_users: false,
      terms_and_conditions: "Valid on all menu items.",
    },
    validity_periods: [
      {
        valid_period: {
          valid_from_time: new Date(1687062000000),
          valid_through_time: new Date(1956556800000),
        },
        time_of_day: [
          // Monday - Thursday Window
          {
            time_windows: {
              open_time: { hours: 13, minutes: 0, seconds: 0, nanos: 0 },
              close_time: { hours: 23, minutes: 0, seconds: 0, nanos: 0 },
            },
            day_of_week: [
              DayOfWeek.MONDAY,
              DayOfWeek.TUESDAY,
              DayOfWeek.WEDNESDAY,
              DayOfWeek.THURSDAY,
            ],
          },
          // Friday - Sunday Window
          {
            time_windows: {
              open_time: { hours: 13, minutes: 0, seconds: 0, nanos: 0 },
              close_time: { hours: 23, minutes: 59, seconds: 59, nanos: 0 },
            },
            day_of_week: [
              DayOfWeek.FRIDAY,
              DayOfWeek.SATURDAY,
              DayOfWeek.SUNDAY,
            ],
          },
        ],
      },
    ],
    offer_url: "https://www.example-restaurant.com/offer/base_offer_1",
    image_url: "https://www.example-restaurant.com/images/offer_base.jpg",
  };

  // 2. Initialize the Feed
  const feed: OfferFeed = { data: [] };

  // 3. Size checking
  // encode().finish() returns a Uint8Array (the binary representation)
  const offerSize = new Blob([JSON.stringify(offer)]).size;
  const currentFeedSize = new Blob([JSON.stringify(feed)]).size;
  
  if (currentFeedSize + offerSize < MAX_BYTES_DATA_FILE) {
    if (feed.data == undefined) {
      feed.data = [offer]; 
    } else {
      feed.data.push(offer);
    }
  } else {
    // Logic for file rotation goes here
    console.log("Feed size limit reached. Rotate file.");
  }

  // 4. Serialize to JSON
  // In JS/TS, we often just use JSON.stringify for the plain object
  // if you used proto3 and want to ensure proper enum/timestamp formatting,
  // use the library's toJSON method.
  const jsonOutput = JSON.stringify(feed);
  console.log(jsonOutput);
}

generateOfferFeed();