cozsweet-frontend-nextjs/src/app/subscription/subscription-screen.helpers.ts

import type { PaymentPlan } from "@/data/dto/payment";

import type { CoinsOfferPlanView } from "./components/subscription-coins-offer-section";
import type { SubscriptionPlanView } from "./components/subscription-plan-card";
import type { VipOfferPlanView } from "./components/subscription-vip-offer-section";

export type SubscriptionType = "vip" | "voice";

export const SUBSCRIPTION_BANNER_TITLES: Record<SubscriptionType, string> = {
  vip: "Subscribe to become the VIP Member",
  voice: "Buy Voice Message Package",
};

export function isVipPlan(plan: PaymentPlan): boolean {
  return plan.orderType.startsWith("vip_") || plan.planId.startsWith("vip_");
}

export function isCreditPlan(plan: PaymentPlan): boolean {
  const orderType = plan.orderType.toLowerCase();
  const planId = plan.planId.toLowerCase();
  return (
    plan.dolAmount !== null ||
    orderType.startsWith("dol_") ||
    orderType.startsWith("credit_") ||
    planId.startsWith("dol_") ||
    planId.startsWith("credit_") ||
    orderType.includes("credit") ||
    planId.includes("credit")
  );
}

function isVoicePackagePlan(plan: PaymentPlan): boolean {
  const orderType = plan.orderType.toLowerCase();
  const planId = plan.planId.toLowerCase();
  return (
    isCreditPlan(plan) ||
    orderType.includes("voice") ||
    planId.includes("voice")
  );
}

export function isPlanForType(
  plan: PaymentPlan,
  subscriptionType: SubscriptionType,
): boolean {
  return subscriptionType === "voice"
    ? isVoicePackagePlan(plan)
    : isVipPlan(plan);
}

function currencySymbol(currency: string): string {
  const normalized = currency.toUpperCase();
  if (normalized === "CNY") return "¥";
  if (normalized === "USD") return "$";
  return `${currency} `;
}

function formatAmount(amountCents: number | null): string | null {
  if (amountCents === null) return null;
  if (!Number.isFinite(amountCents)) return null;
  return (amountCents / 100).toFixed(2).replace(/\.?0+$/, "");
}

function formatOfferAmount(amountCents: number | null): string {
  return (formatAmount(amountCents) ?? "").replace(".", ",");
}

function formatOfferCurrency(currency: string): string {
  const normalized = currency.toUpperCase();
  if (normalized === "USD") return "usd";
  return currency.toLowerCase();
}

function formatCoinCurrency(currency: string): string {
  const normalized = currency.toUpperCase();
  if (normalized === "USD") return "US$";
  if (normalized === "CNY") return "¥";
  return `${currency} `;
}

function vipOfferTitle(plan: PaymentPlan): string {
  const key = `${plan.planId} ${plan.orderType} ${plan.planName}`.toLowerCase();
  if (key.includes("year")) return "Annual";
  if (key.includes("quarter")) return "Quarterly";
  if (key.includes("month")) return "Monthly";
  if (plan.vipDays !== null && plan.vipDays >= 300) return "Annual";
  if (plan.vipDays !== null && plan.vipDays >= 80) return "Quarterly";
  return plan.planName;
}

function planCaption(
  plan: PaymentPlan,
  subscriptionType: SubscriptionType,
): string {
  if (subscriptionType === "voice") {
    return plan.dolAmount === null
      ? "Voice package"
      : `${plan.dolAmount} voice messages`;
  }
  if (plan.dailyPriceCents !== null) {
    const dailyPrice = formatAmount(plan.dailyPriceCents);
    return dailyPrice === null
      ? "Lifetime"
      : `${currencySymbol(plan.currency)}${dailyPrice}/day`;
  }
  if (plan.vipDays === null) return "Lifetime";
  const fallbackDailyPrice = plan.amountCents / Math.max(plan.vipDays, 1);
  return `${currencySymbol(plan.currency)}${formatAmount(fallbackDailyPrice)}/day`;
}

export function toPlanView(
  plan: PaymentPlan,
  subscriptionType: SubscriptionType,
): SubscriptionPlanView {
  return {
    id: plan.planId,
    name: plan.planName,
    price: formatAmount(plan.amountCents) ?? "",
    originalPrice: formatAmount(plan.originalAmountCents),
    perDay: planCaption(plan, subscriptionType),
    currencySymbol: currencySymbol(plan.currency),
  };
}

export function toVipOfferPlanView(plan: PaymentPlan): VipOfferPlanView {
  return {
    id: plan.planId,
    title: vipOfferTitle(plan),
    price: formatOfferAmount(plan.amountCents),
    currency: formatOfferCurrency(plan.currency),
    originalPrice: formatOfferAmount(plan.originalAmountCents),
  };
}

export function toCoinsOfferPlanView(plan: PaymentPlan): CoinsOfferPlanView {
  return {
    id: plan.planId,
    coins: plan.dolAmount ?? 0,
    price: formatOfferAmount(plan.amountCents),
    currency: formatCoinCurrency(plan.currency),
  };
}