export type CheckoutContext = {
  productId?: string;
  qty?: string;
  addressId?: string;
  cross?: boolean;
  select?: boolean;
};

export function buildQuery(ctx: CheckoutContext): string {
  const parts: string[] = [];
  if (ctx.productId) parts.push(`productId=${encodeURIComponent(ctx.productId)}`);
  if (ctx.qty) parts.push(`qty=${encodeURIComponent(ctx.qty)}`);
  if (ctx.addressId) parts.push(`addressId=${encodeURIComponent(ctx.addressId)}`);
  if (ctx.cross) parts.push('cross=1');
  if (ctx.select) parts.push('select=1');
  return parts.join('&');
}

export function buildOrderConfirmUrl(ctx: CheckoutContext): string {
  const qs = buildQuery(ctx);
  return qs ? `/pages/order-confirm/index?${qs}` : '/pages/order-confirm/index';
}

export function buildAddressListUrl(ctx: CheckoutContext): string {
  const qs = buildQuery({ ...ctx, select: true });
  return qs ? `/pages/addresses/index?${qs}` : '/pages/addresses/index';
}

export function buildAddressEditUrl(id: string | undefined, ctx: CheckoutContext): string {
  const base = id ? `/pages/address-edit/index?id=${encodeURIComponent(id)}` : '/pages/address-edit/index';
  const extra = buildQuery(ctx);
  if (!extra) return base;
  return `${base}${base.includes('?') ? '&' : '?'}${extra}`;
}

export function buildPayUrl(params: {
  orderId: string;
  productId?: string;
  qty?: string;
  addressId?: string;
  cross?: boolean;
}): string {
  const parts = [`orderId=${encodeURIComponent(params.orderId)}`];
  if (params.productId) parts.push(`productId=${encodeURIComponent(params.productId)}`);
  if (params.qty) parts.push(`qty=${encodeURIComponent(params.qty)}`);
  if (params.addressId) parts.push(`addressId=${encodeURIComponent(params.addressId)}`);
  if (params.cross) parts.push('cross=1');
  return `/pages/pay/index?${parts.join('&')}`;
}

export function readCheckoutContext(params: Record<string, string | undefined>): CheckoutContext {
  return {
    productId: params.productId,
    qty: params.qty,
    addressId: params.addressId,
    cross: params.cross === '1',
    select: params.select === '1',
  };
}