{
  "type": "local_pickup_options",
  "handle": "store-pickup",
  "title": "In-store pickup",
  "entrypoint": "dist/local-pickup.wasm",
  "inputFields": {
    "shippingAddress": {
      "country": true,
      "city": true,
      "zip": true
    }
  }
}

interface LocalPickupOptionsFunctionInput {
  cart: {
    items: CartItem[];        // same line shape as other function types
    totalPrice: number;       // Subtotal in display currency
    itemCount: number;        // Sum of quantities
    currency: string;         // e.g. "INR", "USD"
    localization?: { country: string; language: string };
    metafields?: MetafieldBag;
  };
  shippingAddress: {
    firstName?: string;
    lastName?: string;
    address1?: string;
    address2?: string;
    city?: string;
    province?: string;
    country?: string;         // country as entered — NOT `countryCode`
    zip?: string;             // NOT `postalCode`
    phone?: string;
  };
  currency: string;           // ISO-4217 of the cart presentment currency
  settings: Record<string, any>;  // Merchant-configured values from the install
}

interface CartItem {
  id: string;                 // lineItemId
  variantId: string;
  productId: string;
  title: string;
  quantity: number;
  price: number;              // Effective unit price (display currency)
  originalPrice: number;
}

interface LocalPickupOptionsFunctionOutput {
  pickupOptions: Array<{
    id: string;             // stable id; surfaces on the order
    title: string;          // shown in checkout, e.g. "Downtown Store"
    address: {
      address1?: string;
      address2?: string;
      city?: string;
      province?: string;
      countryCode?: string;
      postalCode?: string;
      latitude?: number;
      longitude?: number;
    };
    hours?: string;         // free-text, e.g. "Mon–Fri 9–6, Sat 10–4"
    distance?: number;      // straight-line km from shippingAddress
    fee?: number;           // surcharge in cart currency (default 0)
  }>;
}

const LOCATIONS = [
  {
    id: 'store-downtown',
    title: 'Downtown Store',
    country: 'US',
    address: {
      address1: '123 Market St',
      city: 'San Francisco',
      province: 'CA',
      countryCode: 'US',
      postalCode: '94103',
    },
    hours: 'Mon-Fri 9-6, Sat 10-4',
  },
  {
    id: 'store-mission',
    title: 'Mission Store',
    country: 'US',
    address: {
      address1: '456 Valencia St',
      city: 'San Francisco',
      province: 'CA',
      countryCode: 'US',
      postalCode: '94110',
    },
    hours: 'Daily 10-8',
  },
];

export default function main(input) {
  const ship = input.shippingAddress;
  // Country arrives as `country` (no `countryCode`), postal code as `zip`.
  // No latitude/longitude is provided — if you need distance sorting,
  // geocode `ship.zip` / `ship.city` via your own service.
  const country = ship?.country;

  const pickupOptions = LOCATIONS.filter(
    (loc) => !country || loc.country === country,
  ).map((loc) => ({
    id: loc.id,
    title: loc.title,
    address: loc.address,
    hours: loc.hours,
    fee: 0,
  }));

  return { pickupOptions };
}