import {z} from 'zod'

export type GetApiV1RedditSearchArgs = {keywords: Array<string>, n_threads?: number | undefined, method?: ('nl' | 'kw') | undefined, deep?: boolean | undefined, return_type?: ('dicts' | 'string' | 'both') | undefined, time_filter?: ('hour' | 'day' | 'week' | 'month' | 'year' | 'all') | undefined, sort?: ('relevance' | 'hot' | 'top' | 'new' | 'comments') | undefined};

export type GetApiV1RedditSearchOptions = {baseUrl?: string | undefined, APIKey?: string | undefined, fetch?: typeof fetch | undefined};

export const redditComment = z.object({author: z.string(), body: z.string(), date: z.string(), upvotes: z.number().int()});

export const redditEntities = z.object({DATE: z.array(z.string()).optional(), EVENT: z.array(z.string()).optional(), GPE: z.array(z.string()).optional(), ORG: z.array(z.string()).optional(), PERSON: z.array(z.string()).optional(), NORP: z.array(z.string()).optional(), CARDINAL: z.array(z.string()).optional()});

export const redditThread = z.object({author: z.string(), author_comment_karma: z.number().int(), author_link_karma: z.number().int(), body: z.string(), classification: z.union([z.array(z.string()), z.string()]), comments: z.array(redditComment), comments_count: z.number().int(), date: z.string(), entities: redditEntities, id: z.string(), key_takeaways: z.array(z.string()).optional(), keywords: z.array(z.string()), sentiment: z.union([z.number().int(), z.number()]), subreddit_name: z.string(), subreddit_url: z.string(), summary: z.string(), title: z.string(), topic: z.string(), upvotes: z.number().int(), url: z.string(), main_speculation: z.string().optional()});

export const redditResponse = z.object({as_dicts: z.array(redditThread).nullable().optional(), as_string: 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
};

/**
 * Search Reddit, summarize threads, and return analysis.
 * 
 * GET /v1/reddit/search
 */
export const getApiV1RedditSearch = async (args: GetApiV1RedditSearchArgs, options?: GetApiV1RedditSearchOptions) => {
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.keywords ?? []) query.append("keywords", String(item))
if (args.n_threads != null) query.append("n_threads", String(args.n_threads))
if (args.method != null) query.append("method", String(args.method))
if (args.deep != null) query.append("deep", String(args.deep))
if (args.return_type != null) query.append("return_type", String(args.return_type))
if (args.time_filter != null) query.append("time_filter", String(args.time_filter))
if (args.sort != null) query.append("sort", String(args.sort))
if (APIKey !== undefined) headers.set("Authorization", APIKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/reddit/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(redditResponse, await res.json())
};