import {z} from 'zod'

export type ResponsesReasoningRequest = {effort?: (string | null) | undefined, summary?: (string | null) | undefined, enabled?: (boolean | null) | undefined, exclude?: (boolean | null) | undefined} | {[key: string]: unknown};

export type ResponsesTextFormatRequest = {type?: (string | null) | undefined, strict?: (boolean | null) | undefined, schema?: ({[key: string]: unknown} | null) | undefined, name?: (string | null) | undefined} | {[key: string]: unknown};

export type ResponsesTextRequest = {verbosity?: (string | null) | undefined, format?: (ResponsesTextFormatRequest | null) | undefined} | {[key: string]: unknown};

export type ResponsesRequest = {model: string, instructions?: string | undefined, input?: (string | Array<{[key: string]: unknown}>) | undefined, tools?: Array<{[key: string]: unknown}> | undefined, tool_choice?: (string | {[key: string]: unknown}) | undefined, parallel_tool_calls?: boolean | undefined, reasoning?: (ResponsesReasoningRequest | null) | undefined, store?: boolean | undefined, stream?: boolean | undefined, previous_response_id?: (string | null) | undefined, include?: Array<string> | undefined, service_tier?: (string | null) | undefined, prompt_cache_key?: (string | null) | undefined, text?: (ResponsesTextRequest | null) | undefined, max_output_tokens?: (number | null) | undefined, temperature?: (number | null) | undefined, top_p?: (number | null) | undefined, metadata?: ({[key: string]: unknown} | null) | undefined, extra_headers?: ({[key: string]: string} | null) | undefined, extra_body?: ({[key: string]: unknown} | null) | undefined, task_type?: (string | null) | undefined, include_confidence?: (boolean | null) | undefined, include_spans?: (boolean | null) | undefined} | {[key: string]: unknown};

export type CreateApiResponsesArgs = {body: ResponsesRequest};

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

export const createApiResponsesResponse = z.unknown();

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
};

/**
 * Responses
 * 
 * POST /responses
 * 
 * Also accepts auth: BearerAuth
 */
export const createApiResponses = async (args: CreateApiResponsesArgs, options: CreateApiResponsesOptions) => {
const {baseUrl, 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 = `${baseUrl.replace(/\/+$/, '')}/responses${query.size > 0 ? `?${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(createApiResponsesResponse, await res.json())
};