import {z} from 'zod'

export type IncludeDomains = Array<string>;

export type ExcludeDomains = Array<string>;

export type BoostDomains = Array<string>;

export type Freshness = 'day' | 'week' | 'month' | 'year';

export type FreshnessValue = Freshness | string;

export type Country = 'AR' | 'AU' | 'AT' | 'BE' | 'BR' | 'CA' | 'CL' | 'DK' | 'FI' | 'FR' | 'DE' | 'HK' | 'IN' | 'ID' | 'IT' | 'JP' | 'KR' | 'MY' | 'MX' | 'NL' | 'NZ' | 'NO' | 'CN' | 'PL' | 'PT' | 'PH' | 'RU' | 'SA' | 'ZA' | 'ES' | 'SE' | 'CH' | 'TW' | 'TR' | 'GB' | 'US';

export type CreateApiV1ResearchArgs = {body: {input: string, research_effort?: ('lite' | 'standard' | 'deep' | 'exhaustive' | 'frontier') | undefined, source_control?: ({include_domains?: IncludeDomains | undefined, exclude_domains?: ExcludeDomains | undefined, boost_domains?: BoostDomains | undefined, freshness?: FreshnessValue | undefined, country?: Country | undefined}) | undefined, output_schema?: {[key: string]: unknown} | undefined, background?: boolean | undefined}};

export type CreateApiV1ResearchOptions = {baseUrl?: string | undefined, ApiKeyAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const researchOutput = z.object({output: z.object({content: z.union([z.string(), z.record(z.string(), z.unknown())]), content_type: z.enum(["text", "object"]), sources: z.array(z.object({url: z.string(), title: z.string().optional(), snippets: z.array(z.string()).optional()}))}), warnings: z.array(z.string())});

export const researchTaskStatus = z.enum(["queued", "running", "completed", "failed", "cancelled"]);

export const researchTask = z.object({task_id: z.string(), type: z.literal("research"), status: researchTaskStatus, stream_url: z.string(), created_at: z.string()});

export const createApiV1ResearchResponse = z.union([researchOutput, researchTask]);

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
};

/**
 * Returns comprehensive research-grade answers with multi-step reasoning
 * 
 * POST /v1/research
 */
export const createApiV1Research = async (args: CreateApiV1ResearchArgs, options?: CreateApiV1ResearchOptions) => {
const {baseUrl = "https://api.you.com", fetch: fetchFn = fetch, ApiKeyAuth} = options ?? {}

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

if (ApiKeyAuth !== undefined) headers.set("X-API-Key", ApiKeyAuth)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/research${query.size > 0 ? `?${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(createApiV1ResearchResponse, await res.json())
};