import {z} from 'zod'

export type GetApiV1ChatWebsearchArgs = {queries: Array<string>, lookback?: (number | null) | undefined, start_datetime?: (string | null) | undefined, end_datetime?: (string | null) | undefined, engine?: ('v1' | 'v1.5') | undefined, domains?: (Array<string> | null) | undefined, strict?: boolean | undefined, offset?: (number | string | null) | undefined};

export type GetApiV1ChatWebsearchOptions = {baseUrl?: string | undefined, APIKey?: string | undefined, fetch?: typeof fetch | undefined};

export const webSearchResult = z.object({title: z.string(), url: z.string().min(1).max(2083), source: z.string(), published: z.string(), key_points: z.array(z.string()), raw_text: z.string().optional(), as_string_key: z.string().nullable().optional()});

export const webSearchResponse = z.object({as_string: z.string(), as_dicts: z.array(webSearchResult), offset: z.union([z.number().int(), z.string()]).nullable().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
};

/**
 * Run a live websearch.
 * 
 * GET /v1/chat/websearch
 */
export const getApiV1ChatWebsearch = async (args: GetApiV1ChatWebsearchArgs, options?: GetApiV1ChatWebsearchOptions) => {
const {baseUrl = "https://api.asknews.app", fetch: fetchFn = fetch, APIKey} = options ?? {}

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

for (const item of args.queries ?? []) query.append("queries", String(item))
if (args.lookback != null) query.append("lookback", String(args.lookback))
if (args.start_datetime != null) query.append("start_datetime", String(args.start_datetime))
if (args.end_datetime != null) query.append("end_datetime", String(args.end_datetime))
if (args.engine != null) query.append("engine", String(args.engine))
for (const item of args.domains ?? []) query.append("domains", String(item))
if (args.strict != null) query.append("strict", String(args.strict))
if (args.offset != null) query.append("offset", String(args.offset))
if (APIKey !== undefined) headers.set("Authorization", APIKey)

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