import {z} from 'zod'

export type GetApiV1AmazonSearchArgs = {query: string, domain?: string | undefined, page?: number | undefined, sort_by?: ('relevance' | 'price_low_to_high' | 'price_high_to_low' | 'avg_review' | 'newest') | undefined, category?: string | undefined, min_price?: number | undefined, max_price?: number | undefined, zip?: string | undefined, language?: string | undefined};

export type GetApiV1AmazonSearchOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const amazonPrice = z.object({value: z.number().nullable().optional(), currency: z.string().nullable().optional(), symbol: z.string().nullable().optional(), raw: z.string().nullable().optional()});

export const searchResult = z.object({position: z.number().int().optional(), asin: z.string().optional(), title: z.string().optional(), link: z.string().optional(), image: z.string().optional(), price: amazonPrice.optional(), list_price: amazonPrice.optional(), unit_price: z.string().nullable().optional(), rating: z.number().nullable().optional(), ratings_total: z.number().int().nullable().optional(), is_prime: z.boolean().optional(), is_sponsored: z.boolean().optional(), is_amazons_choice: z.boolean().optional(), is_best_seller: z.boolean().optional(), bought_past_month: z.string().nullable().optional(), coupon: z.string().nullable().optional(), availability: z.string().nullable().optional()});

export const pagination = z.object({current: z.union([z.number().int(), z.string()]).optional(), next: z.string().nullable().optional(), total_results: z.number().int().nullable().optional(), total_pages: z.number().int().nullable().optional(), page_no: z.record(z.string(), z.string()).optional()});

export const getApiV1AmazonSearchResponse = z.object({query: z.string().optional(), domain: z.string().optional(), results: z.array(searchResult).optional(), pagination: pagination.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
};

/**
 * Search Products
 * 
 * GET /v1/amazon/search
 */
export const getApiV1AmazonSearch = async (args: GetApiV1AmazonSearchArgs, options?: GetApiV1AmazonSearchOptions) => {
const {baseUrl = "https://scrapebadger.com", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.query != null) query.append("query", String(args.query))
if (args.domain != null) query.append("domain", String(args.domain))
if (args.page != null) query.append("page", String(args.page))
if (args.sort_by != null) query.append("sort_by", String(args.sort_by))
if (args.category != null) query.append("category", String(args.category))
if (args.min_price != null) query.append("min_price", String(args.min_price))
if (args.max_price != null) query.append("max_price", String(args.max_price))
if (args.zip != null) query.append("zip", String(args.zip))
if (args.language != null) query.append("language", String(args.language))
if (apiKey !== undefined) headers.set("x-api-key", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/amazon/search${query.size > 0 ? `?${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(getApiV1AmazonSearchResponse, await res.json())
};