import {z} from 'zod'

export type CreateApiCartCalculateArgs = {body: {return_totals?: boolean | undefined}};

export type CreateApiCartCalculateOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const cartTotals = z.object({subtotal: z.string().optional(), subtotal_tax: z.string().optional(), shipping_total: z.string().optional(), shipping_tax: z.string().optional(), shipping_taxes: z.array(z.number()).optional(), discount_total: z.string().optional(), discount_tax: z.string().optional(), cart_contents_total: z.string().optional(), cart_contents_tax: z.string().optional(), cart_contents_taxes: z.array(z.number()).optional(), fee_total: z.string().optional(), fee_tax: z.string().optional(), fee_taxes: z.array(z.number()).optional(), total: z.string().optional(), total_tax: z.string().optional()});

export const currency = z.object({currency_code: z.string().optional(), currency_symbol: z.string().optional(), currency_symbol_pos: z.string().optional(), currency_minor_unit: z.number().int().optional(), currency_decimal_separator: z.string().optional(), currency_thousand_separator: z.string().optional(), currency_prefix: z.string().optional(), currency_suffix: z.string().optional()});

export const billingAddress = z.object({billing_first_name: z.string().optional(), billing_last_name: z.string().optional(), billing_company: z.string().optional(), billing_country: z.string().optional(), billing_address_1: z.string().optional(), billing_address_2: z.string().optional(), billing_postcode: z.string().optional(), billing_city: z.string().optional(), billing_state: z.string().optional(), billing_phone: z.string().optional(), billing_email: z.string().optional()});

export const shippingAddress = z.object({shipping_first_name: z.string().optional(), shipping_last_name: z.string().optional(), shipping_company: z.string().optional(), shipping_country: z.string().optional(), shipping_address_1: z.string().optional(), shipping_address_2: z.string().optional(), shipping_postcode: z.string().optional(), shipping_city: z.string().optional(), shipping_state: z.string().optional()});

export const customer = z.object({billing_address: billingAddress.optional(), shipping_address: shippingAddress.optional()});

export const cartItem = z.object({item_key: z.string().optional(), id: z.number().int().optional(), name: z.string().optional(), title: z.string().optional(), price: z.string().optional(), quantity: z.object({value: z.number().optional(), min_purchase: z.number().optional(), max_purchase: z.number().optional()}).optional(), totals: z.object({subtotal: z.number().optional(), subtotal_tax: z.number().optional(), total: z.number().optional(), tax: z.number().optional()}).optional(), slug: z.string().optional(), meta: z.object({product_type: z.string().optional(), sku: z.string().optional(), dimensions: z.object({length: z.string().optional(), width: z.string().optional(), height: z.string().optional(), unit: z.string().optional()}).optional(), weight: z.string().optional(), variation: z.union([z.record(z.string(), z.string()), z.array(z.string())]).optional()}).and(z.record(z.string(), z.unknown())).optional(), backorders: z.string().optional(), cart_item_data: z.record(z.string(), z.unknown()).optional(), featured_image: z.string().optional()});

export const appliedCoupon = z.object({coupon: z.string().optional(), label: z.string().optional(), saving: z.string().optional(), saving_html: z.string().optional()});

export const shippingRate = z.object({key: z.string().optional(), method_id: z.string().optional(), instance_id: z.number().int().optional(), label: z.string().optional(), cost: z.string().optional(), html: z.string().optional(), taxes: z.string().optional(), chosen_method: z.boolean().optional()});

export const shippingPackage = z.object({package_name: z.string().optional(), rates: z.record(z.string(), shippingRate).optional(), package_details: z.string().optional(), index: z.number().int().optional(), chosen_method: z.string().optional(), formatted_destination: z.string().optional()});

export const shipping = z.object({total_packages: z.number().int().optional(), show_package_details: z.boolean().optional(), has_calculated_shipping: z.boolean().optional(), packages: z.record(z.string(), shippingPackage).optional()});

export const cartFee = z.object({name: z.string().optional(), amount: z.number().optional(), taxable: z.boolean().optional(), tax_class: z.string().optional(), total: z.number().optional(), tax: z.number().optional()});

export const cartTax = z.object({rate_id: z.number().int().optional(), label: z.string().optional(), compound: z.boolean().optional(), tax_total: z.string().optional(), shipping_tax_total: z.string().optional()});

export const removedItem = z.object({key: z.string().optional(), product_id: z.number().int().optional(), quantity: z.number().int().optional(), name: z.string().optional()});

export const crossSellItem = z.object({id: z.number().int().optional(), product_name: z.string().optional(), product_title: z.string().optional(), price: z.string().optional(), regular_price: z.string().optional(), sale_price: z.string().optional(), product_image: z.string().optional()});

export const cartV2 = z.object({cart_hash: z.string().optional(), cart_key: z.string().optional(), currency: currency.optional(), customer: customer.optional(), items: z.record(z.string(), cartItem).optional(), item_count: z.number().int().optional(), items_weight: z.number().optional(), coupons: z.array(appliedCoupon).optional(), needs_payment: z.boolean().optional(), needs_shipping: z.boolean().optional(), shipping: shipping.optional(), fees: z.array(cartFee).optional(), taxes: z.array(cartTax).optional(), totals: cartTotals.optional(), removed_items: z.array(removedItem).optional(), cross_sells: z.array(crossSellItem).optional(), notices: z.record(z.string(), z.unknown()).optional(), extensions: z.record(z.string(), z.unknown()).optional()});

export const createApiCartCalculateResponse = z.union([cartTotals, cartV2]);

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Calculate cart totals
 * 
 * POST /cart/calculate
 */
export const createApiCartCalculate = async (args: CreateApiCartCalculateArgs, options?: CreateApiCartCalculateOptions) => {
const {baseUrl = "https://example-store.com", fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

const url = `${baseUrl.replace(/\/+$/, '')}/cart/calculate${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(createApiCartCalculateResponse, await res.json())
};