import { PLAN_ORDER, type PlanKey } from "./plans";

export type BillingInterval = "month" | "year";

/**
 * Maps plan keys ↔ provider price/plan IDs, read from env. This is the bridge
 * between our provider-agnostic plan catalog and Stripe/PayPal. Set the matching
 * env vars (STRIPE_PRICE_*, PAYPAL_PLAN_*) for the paid tiers.
 */
const STRIPE_PRICE_ENV: Record<Exclude<PlanKey, "free">, Record<BillingInterval, string | undefined>> = {
  creator: { month: process.env.STRIPE_PRICE_CREATOR_MONTHLY, year: process.env.STRIPE_PRICE_CREATOR_YEARLY },
  pro: { month: process.env.STRIPE_PRICE_PRO_MONTHLY, year: process.env.STRIPE_PRICE_PRO_YEARLY },
  agency: { month: process.env.STRIPE_PRICE_AGENCY_MONTHLY, year: process.env.STRIPE_PRICE_AGENCY_YEARLY },
};

// PayPal plans are created per tier (one billing cycle each); we key by tier and
// optionally distinguish interval if you create yearly PayPal plans too.
const PAYPAL_PLAN_ENV: Record<Exclude<PlanKey, "free">, string | undefined> = {
  creator: process.env.PAYPAL_PLAN_CREATOR,
  pro: process.env.PAYPAL_PLAN_PRO,
  agency: process.env.PAYPAL_PLAN_AGENCY,
};

export function stripePriceId(plan: PlanKey, interval: BillingInterval): string | undefined {
  if (plan === "free") return undefined;
  return STRIPE_PRICE_ENV[plan]?.[interval];
}

export function planFromStripePrice(priceId: string): { plan: PlanKey; interval: BillingInterval } | null {
  for (const plan of PLAN_ORDER) {
    if (plan === "free") continue;
    const intervals = STRIPE_PRICE_ENV[plan];
    if (intervals.month === priceId) return { plan, interval: "month" };
    if (intervals.year === priceId) return { plan, interval: "year" };
  }
  return null;
}

export function paypalPlanId(plan: PlanKey): string | undefined {
  if (plan === "free") return undefined;
  return PAYPAL_PLAN_ENV[plan];
}

export function planFromPaypalPlan(paypalPlanId: string): PlanKey | null {
  for (const plan of PLAN_ORDER) {
    if (plan === "free") continue;
    if (PAYPAL_PLAN_ENV[plan] === paypalPlanId) return plan;
  }
  return null;
}