import {z} from 'zod'

export type GetApiBagsArgs = {shoppingDate: string};

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

export const bagType = z.enum(["REGULAR", "VALUE"]);

export const priceAvailability = z.object({startDate: z.string(), endDate: z.string()});

export const price = z.object({promo: z.boolean(), value: z.number(), originalValue: z.number().nullable(), availability: priceAvailability.nullable().optional()});

export const bag = z.object({id: z.number().int(), erpItemId: z.number().int(), name: z.string(), shortName: z.string(), bagType: bagType, description: z.string(), shortDescription: z.string(), contentsProfile: z.string(), contentsDescription: z.string(), portionText: z.string(), portionSize: z.number().int(), uri: z.string(), imageUrl: z.string(), price: price, customizationFee: z.number(), points: z.number().int().nullable(), allowExtraItems: z.boolean(), extraBagPointPrice: z.number(), published: z.boolean(), immutable: z.boolean(), allowedIntervals: z.array(z.number().int()), allowedCategoryCodes: z.array(z.string()), isDIY: z.boolean(), isFeatured: z.boolean(), isOrganic: z.boolean()});

export const getApiBagsResponse = z.array(bag);

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
};

/**
 * GET /bags
 */
export const getApiBags = async (args: GetApiBagsArgs, options: GetApiBagsOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.shoppingDate != null) query.append("shoppingDate", String(args.shoppingDate))

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

const res = await fetchFn(url, {method: "GET", headers})

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

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