import {z} from 'zod'

export type CreateApiAskArgs = {body: {query: {text: string, site?: string | undefined} | {[key: string]: unknown}, context?: ({'@type'?: string | undefined, prev?: Array<string> | undefined, text?: string | undefined, memory?: string | undefined} | {[key: string]: unknown}) | undefined, prefer?: ({streaming?: boolean | undefined, response_format?: string | undefined, mode?: string | undefined, 'accept-language'?: string | undefined, 'user-agent'?: string | undefined, limit?: number | undefined} | {[key: string]: unknown}) | undefined, meta?: ({version?: string | undefined, session_context?: {[key: string]: unknown} | undefined, user?: (string | {[key: string]: unknown}) | undefined, remember?: boolean | undefined, request_id?: string | undefined} | {[key: string]: unknown}) | undefined} | {[key: string]: unknown}};

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

export const createApiAskResponse = z.union([z.object({_meta: z.object({version: z.literal("0.55"), request_id: z.string().optional(), response_type: z.literal("answer"), response_format: z.literal("conversational_search"), release: z.object({id: z.string()})}).and(z.record(z.string(), z.unknown())), results: z.array(z.object({"@type": z.literal("WebPage"), url: z.string(), name: z.string(), site: z.string(), score: z.number(), description: z.string(), grounding: z.object({evidence: z.array(z.object({id: z.string(), documentId: z.string(), url: z.string(), text: z.string(), start: z.number().int().gte(0).lte(9007199254740991), end: z.number().int().gte(0).lte(9007199254740991), view: z.enum(["origin", "published"]), context: z.object({profile: z.literal("adjacent-passages-v1"), anchorStart: z.number().int().gte(0).lte(9007199254740991), anchorEnd: z.number().int().gte(0).lte(9007199254740991), passageIds: z.array(z.string())}).optional()}))})}))}), z.object({_meta: z.object({version: z.literal("0.55"), request_id: z.string().optional(), response_type: z.literal("failure")}).and(z.record(z.string(), z.unknown())), error: z.object({code: z.string(), message: z.string(), status: z.number().int().gte(-9007199254740991).lte(9007199254740991).optional(), retry_after: z.number().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
};

/**
 * Retrieve published website evidence
 * 
 * POST /ask
 */
export const createApiAsk = async (args: CreateApiAskArgs, options?: CreateApiAskOptions) => {
const {baseUrl = "https://appsflyer.com", fetch: fetchFn = fetch} = options ?? {}

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

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

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

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

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