import {z} from 'zod'

export type CheckoutRatesServiceSelection = {carrier_id: string, service_code: string};

export type CheckoutRatesOptionRequestBody = {name: string, type: 'live_rate' | 'flat_rate' | 'free' | 'local_delivery', services?: Array<CheckoutRatesServiceSelection> | undefined, fee_mode?: ('add' | 'subtract') | undefined, fee_percentage?: number | undefined, sort_index?: number | undefined, fallback_mode?: ('dont_show' | 'flat_rate' | 'cart_percentage') | undefined, fallback_rate_amount?: number | undefined, fallback_rate_currency?: string | undefined, fallback_percentage?: number | undefined, amount?: number | undefined, currency?: string | undefined};

export type CreateApiV2CheckoutRatesConfigIdOptionsArgs = {body: CheckoutRatesOptionRequestBody};

export type CreateApiV2CheckoutRatesConfigIdOptionsOptions = {baseUrl?: string | undefined, apiKeys?: string | undefined, fetch?: typeof fetch | undefined};

export const checkoutRatesServiceSelection = z.object({carrier_id: z.string(), service_code: z.string().min(1)});

export const checkoutRatesOptionResponseBody = z.object({option_id: z.number().int().optional(), config_id: z.string().optional(), name: z.string().optional(), type: z.enum(["live_rate", "flat_rate", "free", "local_delivery"]).optional(), services: z.array(checkoutRatesServiceSelection).optional(), fee_mode: z.enum(["add", "subtract"]).optional(), fee_percentage: z.number().optional(), sort_index: z.number().int().optional(), fallback_mode: z.enum(["dont_show", "flat_rate", "cart_percentage"]).optional(), fallback_rate_amount: z.number().optional(), fallback_rate_currency: z.string().optional(), fallback_percentage: z.number().optional(), amount: z.number().optional(), currency: z.string().optional(), is_active: z.boolean().optional(), created_at: z.string().optional()});

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
};

/**
 * Add a delivery option
 * 
 * POST /v2/checkout_rates/{config_id}/options
 */
export const createApiV2CheckoutRatesConfigIdOptions = async (args: CreateApiV2CheckoutRatesConfigIdOptionsArgs, options?: CreateApiV2CheckoutRatesConfigIdOptionsOptions) => {
const {baseUrl = "https://api.shipstation.com", fetch: fetchFn = fetch, apiKeys} = options ?? {}

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

if (apiKeys !== undefined) headers.set("api-key", apiKeys)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/checkout_rates/${encodeURIComponent(String(args.config_id))}/options${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(checkoutRatesOptionResponseBody, await res.json())
};