Assist_Design/packages/domain/services/utils.ts

import {
  internetCatalogResponseSchema,
  internetPlanCatalogItemSchema,
  simCatalogResponseSchema,
  vpnCatalogResponseSchema,
  type InternetCatalogCollection,
  type InternetPlanCatalogItem,
  type SimCatalogCollection,
  type VpnCatalogCollection,
  type InternetPlanTemplate,
  type CatalogProductBase,
} from "./schema.js";
import type { CatalogPriceInfo } from "./contract.js";

/**
 * Empty catalog defaults shared by portal and BFF.
 */
export const EMPTY_INTERNET_CATALOG: InternetCatalogCollection = {
  plans: [],
  installations: [],
  addons: [],
};

export const EMPTY_SIM_CATALOG: SimCatalogCollection = {
  plans: [],
  activationFees: [],
  addons: [],
};

export const EMPTY_VPN_CATALOG: VpnCatalogCollection = {
  plans: [],
  activationFees: [],
};

/**
 * Safe parser helpers for catalog payloads coming from HTTP boundaries.
 */
export function parseInternetCatalog(data: unknown): InternetCatalogCollection {
  return internetCatalogResponseSchema.parse(data);
}

export function parseSimCatalog(data: unknown): SimCatalogCollection {
  return simCatalogResponseSchema.parse(data);
}

export function parseVpnCatalog(data: unknown): VpnCatalogCollection {
  return vpnCatalogResponseSchema.parse(data);
}

/**
 * Internet tier metadata map shared between BFF and portal presenters.
 */
const INTERNET_TIER_METADATA: Record<string, InternetPlanTemplate> = {
  silver: {
    tierDescription: "Simple package with broadband-modem and ISP only",
    description: "Simple package with broadband-modem and ISP only",
    features: [
      "NTT modem + ISP connection",
      "Two ISP connection protocols: IPoE (recommended) or PPPoE",
      "Self-configuration of router (you provide your own)",
      "Monthly: ¥6,000 | One-time: ¥22,800",
    ],
  },
  gold: {
    tierDescription: "Standard all-inclusive package with basic Wi-Fi",
    description: "Standard all-inclusive package with basic Wi-Fi",
    features: [
      "NTT modem + wireless router (rental)",
      "ISP (IPoE) configured automatically within 24 hours",
      "Basic wireless router included",
      "Optional: TP-LINK RE650 range extender (¥500/month)",
      "Monthly: ¥6,500 | One-time: ¥22,800",
    ],
  },
  platinum: {
    tierDescription: "Tailored set up with premier Wi-Fi management support",
    description:
      "Tailored set up with premier Wi-Fi management support - Recommended for homes & apartments larger than 50m²",
    features: [
      "NTT modem + Netgear INSIGHT Wi-Fi routers",
      "Cloud management support for remote router management",
      "Automatic updates and quicker support",
      "Seamless wireless network setup",
      "Monthly: ¥6,500 | One-time: ¥22,800",
      "Cloud management: ¥500/month per router",
    ],
  },
};

const DEFAULT_PLAN_TEMPLATE: InternetPlanTemplate = {
  tierDescription: "Standard plan",
  description: undefined,
  features: undefined,
};

export function getInternetTierTemplate(tier?: string | null): InternetPlanTemplate {
  if (!tier) {
    return DEFAULT_PLAN_TEMPLATE;
  }

  const normalized = tier.trim().toLowerCase();
  return (
    INTERNET_TIER_METADATA[normalized] ?? {
      tierDescription: `${tier} plan`,
      description: undefined,
      features: undefined,
    }
  );
}

export type InternetInstallationTerm = "One-time" | "12-Month" | "24-Month";

export function inferInstallationTermFromSku(sku: string): InternetInstallationTerm {
  const normalized = sku.toLowerCase();
  if (normalized.includes("24")) return "24-Month";
  if (normalized.includes("12")) return "12-Month";
  return "One-time";
}

export type InternetAddonType = "hikari-denwa-service" | "hikari-denwa-installation" | "other";

export function inferAddonTypeFromSku(sku: string): InternetAddonType {
  const upperSku = sku.toUpperCase();
  const isDenwa =
    upperSku.includes("DENWA") || upperSku.includes("HOME-PHONE") || upperSku.includes("PHONE");

  if (!isDenwa) {
    return "other";
  }

  const isInstallation =
    upperSku.includes("INSTALL") || upperSku.includes("SETUP") || upperSku.includes("ACTIVATION");

  return isInstallation ? "hikari-denwa-installation" : "hikari-denwa-service";
}

/**
 * Helper to apply tier metadata to a plan item.
 */
export function enrichInternetPlanMetadata(plan: InternetPlanCatalogItem): InternetPlanCatalogItem {
  const template = getInternetTierTemplate(plan.internetPlanTier ?? null);
  const existingMetadata = plan.catalogMetadata ?? {};
  const metadata = {
    ...existingMetadata,
    tierDescription: existingMetadata.tierDescription ?? template.tierDescription,
    features: existingMetadata.features ?? template.features,
    isRecommended:
      existingMetadata.isRecommended ??
      (plan.internetPlanTier?.toLowerCase() === "gold" ? true : undefined),
  };

  return internetPlanCatalogItemSchema.parse({
    ...plan,
    description: plan.description ?? template.description,
    catalogMetadata: metadata,
    features: plan.features ?? template.features,
  });
}

export const internetPlanCollectionSchema = internetPlanCatalogItemSchema.array();

/**
 * Calculates display price information for a catalog item
 * Centralized logic for price formatting
 */
export function getCatalogProductPriceDisplay(item: CatalogProductBase): CatalogPriceInfo | null {
  const monthlyPrice = item.monthlyPrice ?? null;
  const oneTimePrice = item.oneTimePrice ?? null;
  const currency = "JPY";

  if (monthlyPrice === null && oneTimePrice === null) {
    return null;
  }

  let display = "";
  if (monthlyPrice !== null && monthlyPrice > 0) {
    display = `¥${monthlyPrice.toLocaleString()}/month`;
  } else if (oneTimePrice !== null && oneTimePrice > 0) {
    display = `¥${oneTimePrice.toLocaleString()} (one-time)`;
  }

  return {
    display,
    monthly: monthlyPrice,
    oneTime: oneTimePrice,
    currency,
  };
}

/**
 * Calculate savings percentage between original and current price
 * Returns 0 if there are no savings (current >= original)
 */
export function calculateSavingsPercentage(originalPrice: number, currentPrice: number): number {
  if (originalPrice <= currentPrice) return 0;
  return Math.round(((originalPrice - currentPrice) / originalPrice) * 100);
}