// Pure billing/tier data and logic, safe to import from client components
// (unlike app/services/billing.server.ts, which does DB I/O and must not be
// bundled client-side — see the currency.ts precedent for why this split
// exists). Plan names/prices here are the single source of truth for both
// shopify.server.ts's billing config and services/billing.server.ts's
// AppSubscription-name-to-Tier mapping.

export type Tier = "free" | "starter" | "growth" | "pro";

export const STARTER_PLAN = "Starter";
export const GROWTH_PLAN = "Growth";
export const PRO_PLAN = "Pro";

export interface PlanPricing {
  tier: Exclude<Tier, "free">;
  name: string;
  amount: number;
  currencyCode: "USD";
  trialDays: number;
}

// Prices from PRODUCT_STRATEGY.md §6. Free has no entry: Shopify's Billing
// API has no concept of a $0 plan, it's just "no active subscription".
export const PLAN_PRICING: PlanPricing[] = [
  { tier: "starter", name: STARTER_PLAN, amount: 9.99, currencyCode: "USD", trialDays: 14 },
  { tier: "growth", name: GROWTH_PLAN, amount: 19.99, currencyCode: "USD", trialDays: 14 },
  { tier: "pro", name: PRO_PLAN, amount: 39.99, currencyCode: "USD", trialDays: 14 },
];

const TIER_RANK: Record<Tier, number> = { free: 0, starter: 1, growth: 2, pro: 3 };

// Location-count ceiling per tier, per PRODUCT_STRATEGY.md §6. null = unlimited.
export const LOCATION_LIMITS: Record<Tier, number | null> = {
  free: 1,
  starter: 3,
  growth: null,
  pro: null,
};

export function tierAtLeast(tier: Tier, min: Tier): boolean {
  return TIER_RANK[tier] >= TIER_RANK[min];
}

export function locationLimitFor(tier: Tier): number | null {
  return LOCATION_LIMITS[tier];
}

// Inverse of PLAN_PRICING's names — maps an AppSubscription's `name` (from
// billing.check()/the app_subscriptions/update webhook) back to our
// internal Tier. Any unrecognized or absent subscription is "free".
export function tierFromPlanName(name: string | undefined | null): Tier {
  const match = PLAN_PRICING.find((p) => p.name === name);
  return match?.tier ?? "free";
}