import {z} from 'zod'

export type GetApiDiscussionArgs = {url: string, fields?: ('links' | 'extlinks' | 'meta' | 'querystring' | 'breadcrumb' | 'sentiment') | undefined, timeout?: number | undefined, callback?: string | undefined, proxy?: string | undefined, proxyAuth?: string | undefined, useProxy?: string | undefined, paging?: boolean | undefined, maxPages?: string | undefined, renderDelay?: number | undefined, scroll?: ('slow' | 'fast') | undefined};

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

export const getApiDiscussionResponse = z.object({request: z.object({pageUrl: z.string().optional(), api: z.string().optional(), version: z.number().int().optional()}).optional(), objects: z.array(z.object({numPages: z.number().int().optional(), humanLanguage: z.string().optional(), confidence: z.number().optional(), diffbotUri: z.string().optional(), pageUrl: z.string().optional(), numPosts: z.number().int().optional(), type: z.string().optional(), title: z.string().optional(), posts: z.array(z.object({date: z.string().optional(), images: z.array(z.object({naturalHeight: z.number().int().optional(), width: z.number().int().optional(), diffbotUri: z.string().optional(), pageUrl: z.string().optional(), url: z.string().optional(), naturalWidth: z.number().int().optional(), height: z.number().int().optional()})).optional(), humanLanguage: z.string().optional(), author: z.string().optional(), authorUrl: z.string().optional(), diffbotUri: z.string().optional(), html: z.string().optional(), pageUrl: z.string().optional(), id: z.number().int().optional(), text: z.string().optional(), type: z.string().optional(), title: z.string().optional()})).optional(), tags: z.array(z.object({score: z.number().optional(), count: z.number().int().optional(), label: z.string().optional(), uri: z.string().optional(), rdfTypes: z.array(z.string()).optional()})).optional(), participants: z.number().int().optional(), rssUrl: z.string().optional()})).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
};

/**
 * Discussion
 * 
 * GET /discussion
 */
export const getApiDiscussion = async (args: GetApiDiscussionArgs, options?: GetApiDiscussionOptions) => {
const {baseUrl = "https://llm.diffbot.com/api/v1/web_search", fetch: fetchFn = fetch, tokenscheme} = options ?? {}

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

if (args.url != null) query.append("url", String(args.url))
if (args.fields != null) query.append("fields", String(args.fields))
if (args.timeout != null) query.append("timeout", String(args.timeout))
if (args.callback != null) query.append("callback", String(args.callback))
if (args.proxy != null) query.append("proxy", String(args.proxy))
if (args.proxyAuth != null) query.append("proxyAuth", String(args.proxyAuth))
if (args.useProxy != null) query.append("useProxy", String(args.useProxy))
if (args.paging != null) query.append("paging", String(args.paging))
if (args.maxPages != null) query.append("maxPages", String(args.maxPages))
if (args.renderDelay != null) query.append("renderDelay", String(args.renderDelay))
if (args.scroll != null) query.append("scroll", String(args.scroll))
if (tokenscheme !== undefined) query.set("token", tokenscheme)

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